ROLLOUT 6 · Pylons/waitress
pylons__waitress-249
Solved
453 stotal time
17tool calls
19model calls
6,309tokens generated
173,775prompt tokens read
No error recorded
⚠ The request log has 18 model calls but the trace has 20 agent calls, so tokens are listed separately instead of beside each turn.
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System instructions 4,822 characters
You are a principal Python software engineer resolving a repository issue in `/workspace`. Your sole objective is to produce a minimal, root-cause source patch that passes every hidden fail-to-pass and pass-to-pass regression test on the first grading run. ## Critical Environment & Grader Rules 1. **Air-Gapped Sandbox & Available CLI Tools**: No network access. Never run `pip`, `uv`, `conda`, or `git fetch`. Note: `rg` (`ripgrep`) is NOT installed in the container — always use `grep -rn --include="*.py"` for fast exact searches so you never waste a tool call on `command not found`. 2. **Protected Grading Paths**: Before running official verification, the grading harness **strips and reverts all changes** to `tests/`, `test/`, `testing/`, `test_*.py`, `*_test.py`, `conftest.py`, `pyproject.toml`, `setup.cfg`, `pytest.ini`, and `tox.ini`. Every part of your fix MUST reside in non-test production source files. 3. **Untracked File Trap (`git add -N .`)**: `submit_patch` stages ALL untracked files inside `/workspace`! Never leave reproduction or scratch files inside `/workspace` — run reproductions inline via `python3 - <<'PY'` or inside `/tmp/repro.py` in a single `run_command`. 4. **Stdout Truncation Rule**: `run_command` truncates stdout after the first 5,000 characters from the TOP. Always run pytest quietly with short tracebacks: `pytest path/to/test_file.py -k pattern -q --tb=short --no-header` If a test file is large, redirect output to `/tmp/pytest.log` and inspect `tail -n 80 /tmp/pytest.log` so failure tracebacks at the bottom are never cut off. 5. **Strict Pacing Discipline**: `get_status` and `submit_patch` are free and do NOT count toward `max_tool_calls`. Target **16-22 counted tool calls total**, and **begin your first `edit_file` change no later than tool call 15**. Reserve at least 4 calls for verification, `git status --short && git diff`, and submission. ## Execution Protocol ### Phase 1 — Pinpoint Code & Tests Immediately (1-2 tool calls) - The user message already contains `Workspace Layout` — do NOT waste a turn running `ls` on top-level directories. - Run a single compound `run_command` with `grep -rn --include="*.py"` to locate: (a) the exact symbols, error strings, or functions from the problem description, (b) **all parallel or sibling implementations** (for example sync + async variants, `Client` + `AsyncClient`, serializer + deserializer, multiple backends/dialects, base + subclass methods, `__init__.py` / `__all__` exports), and (c) the closest existing unit test files under `tests/`. ### Phase 2 — Deep Read & Spec Anchor (2-5 tool calls) - Use `read_file` with generous `start_line` and `end_line` windows (180-300 lines per call so you read whole modules in fewer calls) on the target function/class, callers, type annotations, and neighboring tests. - Before editing, verify every explicit and implicit requirement from the issue: exact parameter names, defaults, boundary/domain edge cases, exception types/messages, `None` vs empty collection vs falsy (`0`, `False`, `""`) semantics, mutability/copying, and return types. ### Phase 3 — Reproduce Bug in One Call (1 tool call) - Run ONE concise command (`python3 - <<'PY' ... PY` or targeted `pytest ... -q --tb=short --no-header`) via `run_command` to observe the exact pre-fix failure. Do NOT spend multiple tool calls writing separate reproduction scripts. ### Phase 4 — Surgical Implementation Across All Parallel Paths (1-4 tool calls) - Begin editing by tool call 15! Use `edit_file` with 4-6 lines of exact surrounding context copied from `read_file`. - Update ALL parallel codepaths (sync/async, multiple classes/dialects, type hints) consistently so partial fixes do not fail sibling tests. - **2-Strike Edit Rule**: If `edit_file` fails twice on the same block due to whitespace or escaping, do not retry `edit_file` a third time — apply an atomic Python transformation via `run_command` and immediately verify `python3 -m py_compile path/to/file.py`. ### Phase 5 — Edge-Case Verification, Diff Hygiene & Clean Exit (2-4 tool calls) - Run a single compound `run_command` testing both your reproduction + boundary edge cases (`None`, empty input, leading/trailing delimiters, subdomain/prefix boundaries, subclass/async parity) AND the relevant existing `pytest` module(s) with `-q --tb=short --no-header`. - Run `git status --short && git diff` via `run_command`. Confirm: - ZERO untracked (`??`) files in `/workspace` (`rm -f` any untracked workspace files immediately), - ZERO modifications to `tests/` or protected config files (`git checkout -- tests/` if touched), - Minimal, clean diff with valid imports and indentation. - Call `submit_patch` once verification passes, then respond with a brief 2-sentence plain-text summary and make NO further tool calls.
Task prompt 3,378 characters
You are evaluating a software engineering task for repository Pylons/waitress. Problem Statement: ReadOnlyFileBasedBuffer does not work with io.IOBase subclasses ReadOnlyFileBasedBuffer checks if it can detect the file length by using `seek` and `tell` methods. While it checks for the file to be able to provide them at https://github.com/Pylons/waitress/blob/master/waitress/buffers.py#L140 it doesn't actually check if those can be used. In `io.IOBase` subclasses that are not seekable, those two methods exist but raise an `UnsupportedOperation`, in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped. Currently waitress is just crashing if it receives an `io.IOBase` subclasses which is not seekable as the file to serve. ## Task Budget (Session terminates when any budget is exhausted) - Time allowance: 7.5 minutes - Tool calls allowance: 30 calls - Max loop iterations: 40 turns ## Execution Environment Rules - Single command timeout: 90 seconds (commands exceeding this fail without ending the session) - Command output limit: 5000 characters - File view limit: 150 lines per read_file call - File character limit: 10000 characters per read_file call - Environment is offline (no network/PyPI access). All repository and test dependencies are ALREADY pre-installed. Do NOT attempt to run pip install or download packages. ## Instructions: 0. All source code is under `/workspace`. Do NOT search outside `/workspace` (e.g. `/usr/`, `/wheels/`, system site-packages). If imports fail, the issue is in the source code under `/workspace`, not in missing system packages. 1. Analyze the problem statement and any provided hints carefully to identify all requested script paths, CLI subcommands, or Python modules. 2. Inspect existing codebase conventions and test files before making edits. 3. Verify your implementation using targeted tests or inline assertions before submitting. 4. Call submit_patch only after your implementation is complete and verified. 5. As your final action, you must return a text-only response reporting your completion to terminate the session. ## Workspace Layout The repository is located at `/workspace`. Here is the directory tree (up to 3 levels): ``` ./CHANGES.txt ./CONTRIBUTORS.txt ./COPYRIGHT.txt ./HISTORY.txt ./LICENSE.txt ./README.rst ./RELEASING.txt ./TODO.txt ./appveyor.yml ./contributing.md ./docs ./rtd.txt ./setup.cfg ./setup.py ./tox.ini ./waitress ./waitress/__init__.py ./waitress/__main__.py ./waitress/adjustments.py ./waitress/buffers.py ./waitress/channel.py ./waitress/compat.py ./waitress/parser.py ./waitress/receiver.py ./waitress/runner.py ./waitress/server.py ./waitress/task.py ./waitress/tests ./waitress/tests/__init__.py ./waitress/tests/fixtureapps ./waitress/tests/test_adjustments.py ./waitress/tests/test_buffers.py ./waitress/tests/test_channel.py ./waitress/tests/test_compat.py ./waitress/tests/test_functional.py ./waitress/tests/test_init.py ./waitress/tests/test_parser.py ./waitress/tests/test_receiver.py ./waitress/tests/test_regression.py ./waitress/tests/test_runner.py ./waitress/tests/test_server.py ./waitress/tests/test_task.py ./waitress/tests/test_trigger.py ./waitress/tests/test_utilities.py ./waitress/tests/test_wasyncore.py ./waitress/trigger.py ./waitress/utilities.py ./waitress/wasyncore.py ```
Turn 1at 19 s221 tokens out2,978 prompt tokens
The user is reporting a bug in `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`. It seems `ReadOnlyFileBasedBuffer` assumes that if `seek` and `tell` methods exist on the file-like object, they are usable, but for some `io.IOBase` subclasses, these methods exist but raise `UnsupportedOperation` if the stream is not seekable. I need to: 1. Locate `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`. 2. Understand how it uses `seek` and `tell`. 3. Create a reproduction case using a non-seekable `io.IOBase` subclass. 4. Fix the bug by checking `.seekable()` or trapping `UnsupportedOperation`. 5. Verify the fix. Let's start by examining `waitress/buffers.py`.
TOOL CALL · run_command
{
"command": "grep -rn --include=\"*.py\" \"ReadOnlyFileBasedBuffer\" ."
}Result of run_command 1,538 characters
{
"status": "ok",
"stdout": "./waitress/buffers.py:132:class ReadOnlyFileBasedBuffer(FileBasedBuffer):\n./waitress/channel.py:21: ReadOnlyFileBasedBuffer,\n./waitress/channel.py:309: if data.__class__ is ReadOnlyFileBasedBuffer:\n./waitress/task.py:21:from .buffers import ReadOnlyFileBasedBuffer\n./waitress/task.py:451: if app_iter.__class__ is ReadOnlyFileBasedBuffer:\n./waitress/task.py:788: 'wsgi.file_wrapper': ReadOnlyFileBasedBuffer,\n./waitress/tests/test_task.py:614: from waitress.buffers import ReadOnlyFileBasedBuffer\n./waitress/tests/test_task.py:616: app_iter = ReadOnlyFileBasedBuffer(f, 8192)\n./waitress/tests/test_task.py:627: from waitress.buffers import ReadOnlyFileBasedBuffer\n./waitress/tests/test_task.py:629: app_iter = ReadOnlyFileBasedBuffer(f, 8192)\n./waitress/tests/test_task.py:641: from waitress.buffers import ReadOnlyFileBasedBuffer\n./waitress/tests/test_task.py:643: app_iter = ReadOnlyFileBasedBuffer(f, 8192)\n./waitress/tests/test_buffers.py:146:class TestReadOnlyFileBasedBuffer(unittest.TestCase):\n./waitress/tests/test_buffers.py:149: from waitress.buffers import ReadOnlyFileBasedBuffer\n./waitress/tests/test_buffers.py:150: return ReadOnlyFileBasedBuffer(file, block_size)\n./waitress/tests/test_channel.py:211: from waitress.buffers import ReadOnlyFileBasedBuffer\n./waitress/tests/test_channel.py:213: wrapper = ReadOnlyFileBasedBuffer(f, 8192)\n",
"stderr": "",
"exit_code": 0
}Turn 2at 23 s50 tokens out3,728 prompt tokens
Okay, the core logic is in `waitress/buffers.py`. Let's examine that file.
TOOL CALL · read_file
{
"filepath": "waitress/buffers.py`,start_line:130"
}Result of read_file 435 characters
{
"status": "error",
"error_type": "FileReadError",
"error_message": "404 Client Error for http+docker://localhost/v1.52/containers/ff3819b6eef4bbf9d55c25f03b62fb47be00379fbd1cb44ccc6deb51619ef8c7/archive?path=%2Fworkspace%2Fwaitress%2Fbuffers.py%60%2Cstart_line%3A130: Not Found (\"Could not find the file /workspace/waitress/buffers.py`,start_line:130 in container ff3819b6eef4bbf9d55c25f03b62fb47be00379fbd1cb44ccc6deb51619ef8c7\")"
}Turn 3at 35 s158 tokens out4,005 prompt tokens
Wait, I might have messed up the `read_file` call or there's some issue with the tool. Let me try again without start_line first to see if I can read the file.
Actually, looking at my previous `run_command`, the file exists at `/workspace/waitress/buffers.py`.
Wait, I tried `read_file{filepath: "waitress/buffers.py", start_line: 130}`. Maybe the file is not that long?
No, the grep output said line 132 has the class definition.
Let me try reading the whole file or a smaller chunk.
TOOL CALL · read_file
{
"filepath": "waitress/buffers.py"
}Result of read_file 4,649 characters
{
"status": "ok",
"filepath": "waitress/buffers.py",
"content": "##############################################################################\n#\n# Copyright (c) 2001-2004 Zope Foundation and Contributors.\n# All Rights Reserved.\n#\n# This software is subject to the provisions of the Zope Public License,\n# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.\n# THIS SOFTWARE IS PROVIDED \"AS IS\" AND ANY AND ALL EXPRESS OR IMPLIED\n# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS\n# FOR A PARTICULAR PURPOSE.\n#\n##############################################################################\n\"\"\"Buffers\n\"\"\"\nfrom io import BytesIO\n\n# copy_bytes controls the size of temp. strings for shuffling data around.\nCOPY_BYTES = 1 << 18 # 256K\n\n# The maximum number of bytes to buffer in a simple string.\nSTRBUF_LIMIT = 8192\n\nclass FileBasedBuffer(object):\n\n remain = 0\n\n def __init__(self, file, from_buffer=None):\n self.file = file\n if from_buffer is not None:\n from_file = from_buffer.getfile()\n read_pos = from_file.tell()\n from_file.seek(0)\n while True:\n data = from_file.read(COPY_BYTES)\n if not data:\n break\n file.write(data)\n self.remain = int(file.tell() - read_pos)\n from_file.seek(read_pos)\n file.seek(read_pos)\n\n def __len__(self):\n return self.remain\n\n def __nonzero__(self):\n return True\n\n __bool__ = __nonzero__ # py3\n\n def append(self, s):\n file = self.file\n read_pos = file.tell()\n file.seek(0, 2)\n file.write(s)\n file.seek(read_pos)\n self.remain = self.remain + len(s)\n\n def get(self, numbytes=-1, skip=False):\n file = self.file\n if not skip:\n read_pos = file.tell()\n if numbytes < 0:\n # Read all\n res = file.read()\n else:\n res = file.read(numbytes)\n if skip:\n self.remain -= len(res)\n else:\n file.seek(read_pos)\n return res\n\n def skip(self, numbytes, allow_prune=0):\n if self.remain < numbytes:\n raise ValueError(\"Can't skip %d bytes in buffer of %d bytes\" % (\n numbytes, self.remain)\n )\n self.file.seek(numbytes, 1)\n self.remain = self.remain - numbytes\n\n def newfile(self):\n raise NotImplementedError()\n\n def prune(self):\n file = self.file\n if self.remain == 0:\n read_pos = file.tell()\n file.seek(0, 2)\n sz = file.tell()\n file.seek(read_pos)\n if sz == 0:\n # Nothing to prune.\n return\n nf = self.newfile()\n while True:\n data = file.read(COPY_BYTES)\n if not data:\n break\n nf.write(data)\n self.file = nf\n\n def getfile(self):\n return self.file\n\n def close(self):\n if hasattr(self.file, 'close'):\n self.file.close()\n self.remain = 0\n\nclass TempfileBasedBuffer(FileBasedBuffer):\n\n def __init__(self, from_buffer=None):\n FileBasedBuffer.__init__(self, self.newfile(), from_buffer)\n\n def newfile(self):\n from tempfile import TemporaryFile\n return TemporaryFile('w+b')\n\nclass BytesIOBasedBuffer(FileBasedBuffer):\n\n def __init__(self, from_buffer=None):\n if from_buffer is not None:\n FileBasedBuffer.__init__(self, BytesIO(), from_buffer)\n else:\n # Shortcut. :-)\n self.file = BytesIO()\n\n def newfile(self):\n return BytesIO()\n\nclass ReadOnlyFileBasedBuffer(FileBasedBuffer):\n # used as wsgi.file_wrapper\n\n def __init__(self, file, block_size=32768):\n self.file = file\n self.block_size = block_size # for __iter__\n\n def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n start_pos = self.file.tell()\n self.file.seek(0, 2)\n end_pos = self.file.tell()\n self.file.seek(start_pos)\n fsize = end_pos - start_pos\n if size is None:\n self.remain = fsize\n else:\n self.remain = min(fsize, size)\n return self.remain",
"start_line": 1,
"end_line": 150,
"total_lines": 298,
"is_truncated": true
}Turn 4at 75 s720 tokens out5,540 prompt tokens
I see the issue in `ReadOnlyFileBasedBuffer.prepare`:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
As mentioned in the problem description, `io.IOBase` subclasses might have `seek` and `tell` methods, but they might raise `UnsupportedOperation` if the stream is not seekable.
Now let's create a reproduction script. I'll create a subclass of `io.IOBase` (or use `io.BufferedReader` on a non-seekable stream, or just a simple mock) that has `seek` and `tell` methods that raise `io.UnsupportedOperation`.
Actually, `io.TextIOWrapper` or `io.BufferedReader` wrapping a socket or pipe would work, but for a simple reproduction, a mock is easier.
Wait, I should use something that actually behaves like a non-seekable `io.IOBase` subclass.
```python
import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
buffer.prepare()
except io.UnsupportedOperation as e:
print(f"Caught expected exception: {e}")
except Exception as e:
print(f"Caught unexpected exception: {type(e).__name__}: {e}")
```
Let's run this reproduction.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport io\nfrom waitress.buffers import ReadOnlyFileBasedBuffer\n\nclass NonSeekableIO(io.IOBase):\n def read(self, size=-1):\n return b\"hello world\"\n def seek(self, offset, whence=0):\n raise io.UnsupportedOperation(\"seek not supported\")\n def tell(self):\n raise io.UnsupportedOperation(\"tell not supported\")\n def seekable(self):\n return False\n\nf = NonSeekableIO()\nbuffer = ReadOnlyFileBasedBuffer(f)\ntry:\n buffer.prepare()\n print(\"Success: prepare() worked\")\nexcept io.UnsupportedOperation as e:\n print(f\"Caught expected exception: {e}\")\nexcept Exception as e:\n print(f\"Caught unexpected exception: {type(e).__name__}: {e}\")\nPY\n"
}Result of run_command 107 characters
{
"status": "ok",
"stdout": "Caught expected exception: tell not supported\n",
"stderr": "",
"exit_code": 0
}Turn 5at 147 s1,080 tokens out6,307 prompt tokens
The reproduction confirms that `buffer.prepare()` raises `io.UnsupportedOperation` when the file-like object has `seek` and `tell` methods but they are not supported.
The proposed fix is to either check `self.file.seekable()` or catch `io.UnsupportedOperation`.
Looking at the code again:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
If it's not seekable, `self.remain` is not initialized in `__init__`.
Wait, `ReadOnlyFileBasedBuffer` inherits from `FileBasedBuffer`.
```python
class FileBasedBuffer(object):
remain = 0
```
So `self.remain` will be 0 if not explicitly set.
But `prepare` returns `self.remain`.
If the file is not seekable, we can't know the size in advance using `seek`/`tell`. In that case, `self.remain` should probably stay 0 or be some indicator that the size is unknown.
If `self.remain` is 0, does that mean the buffer is empty or that we don't know?
The `FileBasedBuffer` usually manages a file it can write to and read from. `ReadOnlyFileBasedBuffer` is used for `wsgi.file_wrapper`.
If `prepare` returns 0, it might be interpreted as the file being empty. But for a non-seekable stream, we can only find out the size by reading it.
Wait, let's look at how `ReadOnlyFileBasedBuffer` is used. In `waitress/task.py` and `waitress/channel.py`.
Actually, the goal of `prepare` seems to be to determine the content length for the HTTP response. If it can't determine it, returning something that indicates "unknown" or just not setting `self.remain` might be correct. But `self.remain` is initialized to 0 in the base class.
Wait, if `self.remain` is 0, it might be wrong if the file is NOT empty but just non-seekable.
However, if it's non-seekable, you can't know the size without reading.
Let's see what happens if we just wrap the `seek`/`tell` block in a `try...except io.UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, `AttributeError` might be raised if `seekable()` was called but didn't exist. But we already checked `hasattr`.
Actually, `io.IOBase` has a `seekable()` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seekable') and self.file.seekable():
# ... seek and tell ...
```
Is `seekable()` always available on things that have `seek` and `tell`? Not necessarily.
The problem statement suggests:
"In `io.IOBase` subclasses that are not seekable, those two methods exist but raise an `UnsupportedOperation`, in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's try both. If I trap `io.UnsupportedOperation`, it's more robust for objects that don't implement `seekable()` but do implement `seek`/`tell` (or lack thereof).
Wait, if `self.remain` is 0, it might lead to `Content-Length: 0` or chunked encoding.
Let's see where `prepare` is called.
Grep for `.prepare(` in `/workspace`.
TOOL CALL · run_command
{
"command": "grep -rn \"\\.prepare(\" ."
}Result of run_command 402 characters
{
"status": "ok",
"stdout": "./waitress/task.py:453: size = app_iter.prepare(cl)\n./waitress/tests/test_buffers.py:155: result = inst.prepare()\n./waitress/tests/test_buffers.py:162: result = inst.prepare()\n./waitress/tests/test_buffers.py:170: result = inst.prepare()\n./waitress/tests/test_channel.py:214: wrapper.prepare()\n",
"stderr": "",
"exit_code": 0
}Turn 6at 155 s96 tokens out7,542 prompt tokens
In `waitress/task.py`: ```python ./waitress/task.py:453: size = app_iter.prepare(cl) ``` Let's look at `waitress/task.py` around line 453.
TOOL CALL · read_file
{
"filepath": "waitress/task.py`,start_line:440,end_line:470"
}Result of read_file 459 characters
{
"status": "error",
"error_type": "FileReadError",
"error_message": "404 Client Error for http+docker://localhost/v1.52/containers/ff3819b6eef4bbf9d55c25f03b62fb47be00379fbd1cb44ccc6deb51619ef8c7/archive?path=%2Fworkspace%2Fwaitress%2Ftask.py%60%2Cstart_line%3A440%2Cend_line%3A470: Not Found (\"Could not find the file /workspace/waitress/task.py`,start_line:440,end_line:470 in container ff3819b6eef4bbf9d55c25f03b62fb47be00379fbd1cb44ccc6deb51619ef8c7\")"
}Turn 7at 166 s174 tokens out7,884 prompt tokens
I'm having issues with `read_file` using `start_line` and `end_line`. It seems it might be failing in the backend. I'll try reading the file without lines or in larger blocks if needed, but let me try once more without just `filepath`. Wait, I see what happened in the previous error: `path=%2Fworkspace%2Fwaitress%2Fbuffers.py%60%2Cstart_line%3A130`. It looks like the `start_line` and `end_line` are being passed as part of the path in the URL? That's weird. Let me try `read_file` again with only `filepath`.
TOOL CALL · read_file
{
"filepath": "waitress/task.py"
}Result of read_file 5,284 characters
{
"status": "ok",
"filepath": "waitress/task.py",
"content": "##############################################################################\n#\n# Copyright (c) 2001, 2002 Zope Foundation and Contributors.\n# All Rights Reserved.\n#\n# This software is subject to the provisions of the Zope Public License,\n# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.\n# THIS SOFTWARE IS PROVIDED \"AS IS\" AND ANY AND ALL EXPRESS OR IMPLIED\n# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS\n# FOR A PARTICULAR PURPOSE.\n#\n##############################################################################\n\nfrom collections import deque\nimport socket\nimport sys\nimport threading\nimport time\n\nfrom .buffers import ReadOnlyFileBasedBuffer\nfrom .compat import reraise, tobytes\nfrom .utilities import (\n Forwarded,\n PROXY_HEADERS,\n build_http_date,\n clear_untrusted_headers,\n logger,\n queue_logger,\n undquote,\n)\n\nrename_headers = { # or keep them without the HTTP_ prefix added\n 'CONTENT_LENGTH': 'CONTENT_LENGTH',\n 'CONTENT_TYPE': 'CONTENT_TYPE',\n}\n\nhop_by_hop = frozenset((\n 'connection',\n 'keep-alive',\n 'proxy-authenticate',\n 'proxy-authorization',\n 'te',\n 'trailers',\n 'transfer-encoding',\n 'upgrade'\n))\n\n\nclass ThreadedTaskDispatcher(object):\n \"\"\"A Task Dispatcher that creates a thread for each task.\n \"\"\"\n stop_count = 0 # Number of threads that will stop soon.\n active_count = 0 # Number of currently active threads\n logger = logger\n queue_logger = queue_logger\n\n def __init__(self):\n self.threads = set()\n self.queue = deque()\n self.lock = threading.Lock()\n self.queue_cv = threading.Condition(self.lock)\n self.thread_exit_cv = threading.Condition(self.lock)\n\n def start_new_thread(self, target, args):\n t = threading.Thread(target=target, name='waitress', args=args)\n t.daemon = True\n t.start()\n\n def handler_thread(self, thread_no):\n while True:\n with self.lock:\n while not self.queue and self.stop_count == 0:\n # Mark ourselves as idle before waiting to be\n # woken up, then we will once again be active\n self.active_count -= 1\n self.queue_cv.wait()\n self.active_count += 1\n\n if self.stop_count > 0:\n self.active_count -= 1\n self.stop_count -= 1\n self.threads.discard(thread_no)\n self.thread_exit_cv.notify()\n break\n\n task = self.queue.popleft()\n try:\n task.service()\n except BaseException:\n self.logger.exception(\n 'Exception when servicing %r', task)\n\n def set_thread_count(self, count):\n with self.lock:\n threads = self.threads\n thread_no = 0\n running = len(threads) - self.stop_count\n while running < count:\n # Start threads.\n while thread_no in threads:\n thread_no = thread_no + 1\n threads.add(thread_no)\n running += 1\n self.start_new_thread(self.handler_thread, (thread_no,))\n self.active_count += 1\n thread_no = thread_no + 1\n if running > count:\n # Stop threads.\n self.stop_count += running - count\n self.queue_cv.notify_all()\n\n def add_task(self, task):\n with self.lock:\n self.queue.append(task)\n self.queue_cv.notify()\n queue_size = len(self.queue)\n idle_threads = (\n len(self.threads) - self.stop_count - self.active_count)\n if queue_size > idle_threads:\n self.queue_logger.warning(\n \"Task queue depth is %d\", queue_size - idle_threads)\n\n def shutdown(self, cancel_pending=True, timeout=5):\n self.set_thread_count(0)\n # Ensure the threads shut down.\n threads = self.threads\n expiration = time.time() + timeout\n with self.lock:\n while threads:\n if time.time() >= expiration:\n self.logger.warning(\n \"%d thread(s) still running\", len(threads))\n break\n self.thread_exit_cv.wait(0.1)\n if cancel_pending:\n # Cancel remaining tasks.\n queue = self.queue\n if len(queue) > 0:\n self.logger.warning(\n \"Canceling %d pending task(s)\", len(queue))\n while queue:\n task = queue.popleft()\n task.cancel()\n self.queue_cv.notify_all()\n return True\n return False\n\nclass Task(object):\n close_on_finish = False",
"start_line": 1,
"end_line": 150,
"total_lines": 833,
"is_truncated": true
}Turn 8at 175 s127 tokens out9,457 prompt tokens
The file `waitress/task.py` is large. I'll try to read the relevant part using `tail` and `grep -C` since `read_file` seems to fail with `start_line`/`end_line` in some cases (although it might just be my misunderstanding of how it's used). Actually, I'll try `run_command` with `sed` to get the specific lines.
TOOL CALL · run_command
{
"command": "sed -n '440,470p' waitress/task.py"
}Result of run_command 1,382 characters
{
"status": "ok",
"stdout": "\n self.response_headers.extend(headers)\n\n # Return a method used to write the response data.\n return self.write\n\n # Call the application to handle the request and write a response\n app_iter = self.channel.server.application(env, start_response)\n\n can_close_app_iter = True\n try:\n if app_iter.__class__ is ReadOnlyFileBasedBuffer:\n cl = self.content_length\n size = app_iter.prepare(cl)\n if size:\n if cl != size:\n if cl is not None:\n self.remove_content_length_header()\n self.content_length = size\n self.write(b'') # generate headers\n # if the write_soon below succeeds then the channel will\n # take over closing the underlying file via the channel's\n # _flush_some or handle_close so we intentionally avoid\n # calling close in the finally block\n self.channel.write_soon(app_iter)\n can_close_app_iter = False\n return\n\n first_chunk_len = None\n for chunk in app_iter:\n if first_chunk_len is None:\n",
"stderr": "",
"exit_code": 0
}Turn 9at 277 s1,725 tokens out9,922 prompt tokens
Okay, so if `app_iter.prepare(cl)` returns a positive size, it's used to set the content length and the channel takes over writing it. If `prepare` returns 0 or is skipped, it falls back to iterating over `app_iter` and potentially using chunked encoding if `cl` was not set.
If `prepare` returns 0 for a non-seekable but non-empty file, it will be treated as an empty file (if `size` is 0 and `cl` is 0) or it will proceed to `for chunk in app_iter` which is correct for non-seekable files anyway.
Wait, if `size` is 0, `if size:` is false. So it will go to the `for chunk in app_iter` loop.
```python
size = app_iter.prepare(cl)
if size:
# ... use size ...
return
```
So if `prepare` returns 0 (which is the default `self.remain` in `FileBasedBuffer`), it just falls through to the chunked iteration. This is exactly what we want for non-seekable files.
So the fix is simply to make sure `prepare` doesn't raise `io.UnsupportedOperation` when calling `tell` or `seek`.
I will implement the fix by wrapping the seek/tell block in a `try...except (io.UnsupportedOperation, AttributeError)`. I include `AttributeError` just in case, although `hasattr` should cover it. `io.UnsupportedOperation` is the main one.
Actually, the problem statement says:
"in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's use `seekable()` if available, and fall back to trapping `UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
if hasattr(self.file, 'seekable') and not self.file.seekable():
return self.remain
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if I use `try...except`, the `hasattr(self.file, 'seekable')` check is redundant.
Let's just use the `try...except` block.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I need to make sure `io` is imported in `waitress/buffers.py`.
Looking at the beginning of `waitress/buffers.py`:
```python
from io import BytesIO
```
It only imports `BytesIO`. I should import `io` or `UnsupportedOperation` from `io`.
Let's check if `io` is already available or if I should add the import.
I will add `import io` at the top.
Wait, if I just do `import io`, I can use `io.UnsupportedOperation`.
Let's refine the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if `self.file` is just a file-like object that doesn't inherit from `io.IOBase`, it might not raise `io.UnsupportedOperation` but some other exception. But `io.UnsupportedOperation` is the standard for this.
Let's check how to best import `io`.
Current imports:
```python
from io import BytesIO
```
I'll change it to:
```python
import io
from io import BytesIO
```
Or just:
```python
import io
# ...
# and use io.BytesIO instead of BytesIO
```
But I should minimize changes.
I'll use:
```python
import io
from io import BytesIO
```
Wait, the existing code uses `BytesIO` directly.
```python
class BytesIOBasedBuffer(FileBasedBuffer):
def __init__(self, from_buffer=None):
if from_buffer is not None:
FileBasedBuffer.__init__(self, BytesIO(), from_buffer)
else:
# Shortcut. :-)
self.file = BytesIO()
def newfile(self):
return BytesIO()
```
So I will add `import io` at the top.
Wait, I should check if `ReadOnlyFileBasedBuffer`'s `prepare` is used anywhere else that might be affected.
It's used in `waitress/task.py`, `waitress/tests/test_buffers.py`, `waitress/tests/test_channel.py`.
The existing tests:
`waitress/tests/test_buffers.py`: calls `inst.prepare()`.
`waitress/tests/test_channel.py`: calls `wrapper.prepare()`.
Let's verify the fix with the reproduction script first.
TOOL CALL · write_file
{
"content": "import io\nfrom waitress.buffers import ReadOnlyFileBasedBuffer\n\nclass NonSeekableIO(io.IOBase):\n def read(self, size=-1):\n return b\"hello world\"\n def seek(self, offset, whence=0):\n raise io.UnsupportedOperation(\"seek not supported\")\n def tell(self):\n raise io.UnsupportedOperation(\"tell not supported\")\n def seekable(self):\n return False\n\ndef test_prepare():\n f = NonSeekableIO()\n buffer = ReadOnlyFileBasedBuffer(f)\n try:\n result = buffer.prepare()\n print(f\"Success: prepare() returned {result}\")\n except io.UnsupportedOperation as e:\n print(f\"Failure: Caught io.UnsupportedOperation: {e}\")\n except Exception as e:\n print(f\"Failure: Caught unexpected exception: {type(e).__name__}: {e}\")\n\nif __name__ == \"__main__\":\n test_prepare()\n",
"filepath": "/tmp/repro.py"
}Result of write_file 136 characters
{
"status": "error",
"error_type": "FileWriteError",
"error_message": "Path traversal detected: '/tmp/repro.py' escapes workspace root."
}Turn 10at 285 s107 tokens out11,700 prompt tokens
Ah, I forgot the rule about `/tmp`. I should just use `python3 - <<'PY'`. Let's apply the fix first and then run reproduction. Step 1: Add `import io`. Step 2: Update `prepare` method. Wait, I'll first check where to put `import io`.
TOOL CALL · read_file
{
"end_line": 20,
"filepath": "waitress/buffers.py",
"start_line": 1
}Result of read_file 952 characters
{
"status": "ok",
"filepath": "waitress/buffers.py",
"content": "##############################################################################\n#\n# Copyright (c) 2001-2004 Zope Foundation and Contributors.\n# All Rights Reserved.\n#\n# This software is subject to the provisions of the Zope Public License,\n# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.\n# THIS SOFTWARE IS PROVIDED \"AS IS\" AND ANY AND ALL EXPRESS OR IMPLIED\n# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS\n# FOR A PARTICULAR PURPOSE.\n#\n##############################################################################\n\"\"\"Buffers\n\"\"\"\nfrom io import BytesIO\n\n# copy_bytes controls the size of temp. strings for shuffling data around.\nCOPY_BYTES = 1 << 18 # 256K\n",
"start_line": 1,
"end_line": 20,
"total_lines": 298,
"is_truncated": false
}Turn 11at 294 s170 tokens out12,078 prompt tokens
I'll change `from io import BytesIO` to `import io` and then use `io.BytesIO`. Wait, if I change `BytesIO` to `io.BytesIO` in multiple places, it might be more changes than needed. I'll just add `import io` before `from io import BytesIO`. Actually, if I do: ```python import io from io import BytesIO ``` Then I can use both `io.UnsupportedOperation` and `BytesIO`. Now let's apply the edits.
TOOL CALL · edit_file
{
"filepath": "waitress/buffers.py",
"new_string": "import io\nfrom io import BytesIO\n",
"old_string": "from io import BytesIO\n"
}Result of edit_file 421 characters
{
"status": "ok",
"filepath": "waitress/buffers.py",
"occurrences": 1,
"strategy": "exact",
"diff": "--- a/waitress/buffers.py\n+++ b/waitress/buffers.py\n@@ -13,6 +13,7 @@\n ##############################################################################\n \"\"\"Buffers\n \"\"\"\n+import io\n from io import BytesIO\n \n # copy_bytes controls the size of temp. strings for shuffling data around.\n",
"is_truncated": false
}Turn 12at 320 s632 tokens out12,390 prompt tokens
Now the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
I will replace it with:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I should be careful with indentation.
TOOL CALL · edit_file
{
"filepath": "waitress/buffers.py",
"new_string": " def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n try:\n start_pos = self.file.tell()\n self.file.seek(0, 2)\n end_pos = self.file.tell()\n self.file.seek(start_pos)\n fsize = end_pos - start_pos\n if size is None:\n self.remain = fsize\n else:\n self.remain = min(fsize, size)\n except (io.UnsupportedOperation, AttributeError):\n pass\n return self.remain",
"old_string": " def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n start_pos = self.file.tell()\n self.file.seek(0, 2)\n end_pos = self.file.tell()\n self.file.seek(start_pos)\n fsize = end_pos - start_pos\n if size is None:\n self.remain = fsize\n else:\n self.remain = min(fsize, size)\n return self.remain"
}Result of edit_file 1,211 characters
{
"status": "ok",
"filepath": "waitress/buffers.py",
"occurrences": 1,
"strategy": "exact",
"diff": "--- a/waitress/buffers.py\n+++ b/waitress/buffers.py\n@@ -139,15 +139,18 @@\n \n def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n- start_pos = self.file.tell()\n- self.file.seek(0, 2)\n- end_pos = self.file.tell()\n- self.file.seek(start_pos)\n- fsize = end_pos - start_pos\n- if size is None:\n- self.remain = fsize\n- else:\n- self.remain = min(fsize, size)\n+ try:\n+ start_pos = self.file.tell()\n+ self.file.seek(0, 2)\n+ end_pos = self.file.tell()\n+ self.file.seek(start_pos)\n+ fsize = end_pos - start_pos\n+ if size is None:\n+ self.remain = fsize\n+ else:\n+ self.remain = min(fsize, size)\n+ except (io.UnsupportedOperation, AttributeError):\n+ pass\n return self.remain\n \n def get(self, numbytes=-1, skip=False):\n",
"is_truncated": false
}Turn 13at 328 s265 tokens out13,410 prompt tokens
Now let's run the reproduction script to verify it works.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport io\nfrom waitress.buffers import ReadOnlyFileBasedBuffer\n\nclass NonSeekableIO(io.IOBase):\n def read(self, size=-1):\n return b\"hello world\"\n def seek(self, offset, whence=0):\n raise io.UnsupportedOperation(\"seek not supported\")\n def tell(self):\n raise io.UnsupportedOperation(\"tell not supported\")\n def seekable(self):\n return False\n\ndef test_prepare():\n f = NonSeekableIO()\n buffer = ReadOnlyFileBasedBuffer(f)\n try:\n result = buffer.prepare()\n print(f\"Success: prepare() returned {result}\")\n except io.UnsupportedOperation as e:\n print(f\"Failure: Caught io.UnsupportedOperation: {e}\")\n except Exception as e:\n print(f\"Failure: Caught unexpected exception: {type(e).__name__}: {e}\")\n\nif __name__ == \"__main__\":\n test_prepare()\nPY\n"
}Result of run_command 91 characters
{
"status": "ok",
"stdout": "Success: prepare() returned 0\n",
"stderr": "",
"exit_code": 0
}Turn 14at 333 s73 tokens out13,722 prompt tokens
The reproduction now succeeds and returns 0, which is correct for a non-seekable file using the current logic. Now let's run existing tests to make sure no regression.
TOOL CALL · run_command
{
"command": "pytest waitress/tests/test_buffers.py -q --tb=short --no-header"
}Result of run_command 161 characters
{
"status": "ok",
"stdout": ".................................................... [100%]\n52 passed in 0.04s\n",
"stderr": "",
"exit_code": 0
}Turn 15at 337 s81 tokens out13,858 prompt tokens
Other tests might also be relevant. Let's run `waitress/tests/test_task.py` and `waitress/tests/test_channel.py`.
TOOL CALL · run_command
{
"command": "pytest waitress/tests/test_task.py waitress/tests/test_channel.py -q --tb=short --no-header"
}Result of run_command 324 characters
{
"status": "ok",
"stdout": "........................................................................ [ 44%]\n........................................................................ [ 88%]\n.................. [100%]\n162 passed in 0.21s\n",
"stderr": "",
"exit_code": 0
}Turn 16at 346 s129 tokens out14,025 prompt tokens
All tests passed. Let's double check if I missed any parallel paths. `ReadOnlyFileBasedBuffer` is inheriting from `FileBasedBuffer`. The other buffers are `TempfileBasedBuffer` and `BytesIOBasedBuffer`. Do they need `prepare`? They are `FileBasedBuffer` subclasses, but they don't override `prepare`. Wait, `prepare` is only defined in `ReadOnlyFileBasedBuffer`. Let's check `waitress/buffers.py` again.
TOOL CALL · read_file
{
"filepath": "waitress/buffers.py"
}Result of read_file 4,634 characters
{
"status": "ok",
"filepath": "waitress/buffers.py",
"content": "##############################################################################\n#\n# Copyright (c) 2001-2004 Zope Foundation and Contributors.\n# All Rights Reserved.\n#\n# This software is subject to the provisions of the Zope Public License,\n# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.\n# THIS SOFTWARE IS PROVIDED \"AS IS\" AND ANY AND ALL EXPRESS OR IMPLIED\n# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS\n# FOR A PARTICULAR PURPOSE.\n#\n##############################################################################\n\"\"\"Buffers\n\"\"\"\nimport io\nfrom io import BytesIO\n\n# copy_bytes controls the size of temp. strings for shuffling data around.\nCOPY_BYTES = 1 << 18 # 256K\n\n# The maximum number of bytes to buffer in a simple string.\nSTRBUF_LIMIT = 8192\n\nclass FileBasedBuffer(object):\n\n remain = 0\n\n def __init__(self, file, from_buffer=None):\n self.file = file\n if from_buffer is not None:\n from_file = from_buffer.getfile()\n read_pos = from_file.tell()\n from_file.seek(0)\n while True:\n data = from_file.read(COPY_BYTES)\n if not data:\n break\n file.write(data)\n self.remain = int(file.tell() - read_pos)\n from_file.seek(read_pos)\n file.seek(read_pos)\n\n def __len__(self):\n return self.remain\n\n def __nonzero__(self):\n return True\n\n __bool__ = __nonzero__ # py3\n\n def append(self, s):\n file = self.file\n read_pos = file.tell()\n file.seek(0, 2)\n file.write(s)\n file.seek(read_pos)\n self.remain = self.remain + len(s)\n\n def get(self, numbytes=-1, skip=False):\n file = self.file\n if not skip:\n read_pos = file.tell()\n if numbytes < 0:\n # Read all\n res = file.read()\n else:\n res = file.read(numbytes)\n if skip:\n self.remain -= len(res)\n else:\n file.seek(read_pos)\n return res\n\n def skip(self, numbytes, allow_prune=0):\n if self.remain < numbytes:\n raise ValueError(\"Can't skip %d bytes in buffer of %d bytes\" % (\n numbytes, self.remain)\n )\n self.file.seek(numbytes, 1)\n self.remain = self.remain - numbytes\n\n def newfile(self):\n raise NotImplementedError()\n\n def prune(self):\n file = self.file\n if self.remain == 0:\n read_pos = file.tell()\n file.seek(0, 2)\n sz = file.tell()\n file.seek(read_pos)\n if sz == 0:\n # Nothing to prune.\n return\n nf = self.newfile()\n while True:\n data = file.read(COPY_BYTES)\n if not data:\n break\n nf.write(data)\n self.file = nf\n\n def getfile(self):\n return self.file\n\n def close(self):\n if hasattr(self.file, 'close'):\n self.file.close()\n self.remain = 0\n\nclass TempfileBasedBuffer(FileBasedBuffer):\n\n def __init__(self, from_buffer=None):\n FileBasedBuffer.__init__(self, self.newfile(), from_buffer)\n\n def newfile(self):\n from tempfile import TemporaryFile\n return TemporaryFile('w+b')\n\nclass BytesIOBasedBuffer(FileBasedBuffer):\n\n def __init__(self, from_buffer=None):\n if from_buffer is not None:\n FileBasedBuffer.__init__(self, BytesIO(), from_buffer)\n else:\n # Shortcut. :-)\n self.file = BytesIO()\n\n def newfile(self):\n return BytesIO()\n\nclass ReadOnlyFileBasedBuffer(FileBasedBuffer):\n # used as wsgi.file_wrapper\n\n def __init__(self, file, block_size=32768):\n self.file = file\n self.block_size = block_size # for __iter__\n\n def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n try:\n start_pos = self.file.tell()\n self.file.seek(0, 2)\n end_pos = self.file.tell()\n self.file.seek(start_pos)\n fsize = end_pos - start_pos\n if size is None:\n self.remain = fsize\n else:",
"start_line": 1,
"end_line": 150,
"total_lines": 302,
"is_truncated": true
}Turn 17at 362 s202 tokens out15,520 prompt tokens
Yes, `prepare` is only in `ReadOnlyFileBasedBuffer`. The `FileBasedBuffer` itself uses `tell` and `seek` in several places: `__init__`, `append`, `get`, `skip`, `prune`. But `FileBasedBuffer` is intended for writeable buffers (like `TempfileBasedBuffer` or `BytesIOBasedBuffer`), which are always seekable. `ReadOnlyFileBasedBuffer` is specifically for `wsgi.file_wrapper`, where the file provided by the WSGI app might be a non-seekable stream. If a user provides a non-seekable stream to `FileBasedBuffer` directly (which is not the intended use case, usually), it would crash. But the issue specifically mentioned `ReadOnlyFileBasedBuffer`. Let's verify `git status --short && git diff`.
TOOL CALL · run_command
{
"command": "git status --short && git diff"
}Result of run_command 1,547 characters
{
"status": "ok",
"stdout": " M waitress/buffers.py\ndiff --git a/waitress/buffers.py b/waitress/buffers.py\nindex cacc094..24bbba2 100644\n--- a/waitress/buffers.py\n+++ b/waitress/buffers.py\n@@ -13,6 +13,7 @@\n ##############################################################################\n \"\"\"Buffers\n \"\"\"\n+import io\n from io import BytesIO\n \n # copy_bytes controls the size of temp. strings for shuffling data around.\n@@ -138,15 +139,18 @@ class ReadOnlyFileBasedBuffer(FileBasedBuffer):\n \n def prepare(self, size=None):\n if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):\n- start_pos = self.file.tell()\n- self.file.seek(0, 2)\n- end_pos = self.file.tell()\n- self.file.seek(start_pos)\n- fsize = end_pos - start_pos\n- if size is None:\n- self.remain = fsize\n- else:\n- self.remain = min(fsize, size)\n+ try:\n+ start_pos = self.file.tell()\n+ self.file.seek(0, 2)\n+ end_pos = self.file.tell()\n+ self.file.seek(start_pos)\n+ fsize = end_pos - start_pos\n+ if size is None:\n+ self.remain = fsize\n+ else:\n+ self.remain = min(fsize, size)\n+ except (io.UnsupportedOperation, AttributeError):\n+ pass\n return self.remain\n \n def get(self, numbytes=-1, skip=False):\n",
"stderr": "",
"exit_code": 0
}Turn 18at 438 s163 tokens out4,753 prompt tokens
The diff looks correct. Wait, I used `AttributeError` in the exception handler. Is it necessary? `hasattr(self.file, 'seek')` already checks for the existence of the method. However, some objects might implement `__getattr__` or other dynamic mechanisms that make `hasattr` return `True` but then raise `AttributeError` when called. Or maybe the `tell` method exists but `seek` does not (though we check both). Including `AttributeError` is safer and doesn't hurt. One detail: `io.UnsupportedOperation` is the standard exception for non-seekable streams in Python's `io` module. I am confident in the fix.
TOOL CALL · submit_patch
Result of submit_patch 56 characters
{
"status": "ok",
"patch_size": 1417,
"files_changed": 1
}Turn 19at 446 s136 tokens out4,956 prompt tokens
The patch is submitted. I have reproduced the bug, fixed it by wrapping the seek/tell operations in a try-except block to handle non-seekable streams, and verified it with both the reproduction script and existing tests.
Turn 20at 446 s
The bug where `ReadOnlyFileBasedBuffer.prepare` crashed when handling non-seekable `io.IOBase` subclasses was fixed by wrapping the `seek` and `tell` operations in a `try...except (io.UnsupportedOperation, AttributeError)` block. This ensures that if a file is non-seekable, the method safely returns the default `self.remain` value (0) instead of raising an exception.
Model calls (not matched to turns)
Generated tokens 221 tokens · stopped: STOP
The user is reporting a bug in `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`. It seems `ReadOnlyFileBasedBuffer` assumes that if `seek` and `tell` methods exist on the file-like object, they are usable, but for some `io.IOBase` subclasses, these methods exist but raise `UnsupportedOperation` if the stream is not seekable. I need to: 1. Locate `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`. 2. Understand how it uses `seek` and `tell`. 3. Create a reproduction case using a non-seekable `io.IOBase` subclass. 4. Fix the bug by checking `.seekable()` or trapping `UnsupportedOperation`. 5. Verify the fix. Let's start by examining `waitress/buffers.py`.
<|channel>thought
The user is reporting a bug in `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`.
It seems `ReadOnlyFileBasedBuffer` assumes that if `seek` and `tell` methods exist on the file-like object, they are usable, but for some `io.IOBase` subclasses, these methods exist but raise `UnsupportedOperation` if the stream is not seekable.
I need to:
1. Locate `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`.
2. Understand how it uses `seek` and `tell`.
3. Create a reproduction case using a non-seekable `io.IOBase` subclass.
4. Fix the bug by checking `.seekable()` or trapping `UnsupportedOperation`.
5. Verify the fix.
Let's start by examining `waitress/buffers.py`.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" "ReadOnlyFileBasedBuffer" .<|"|>}<tool_call|><|tool_response>
Generated tokens 50 tokens · stopped: STOP
Okay, the core logic is in `waitress/buffers.py`. Let's examine that file.
Okay, the core logic is in `waitress/buffers.py`. Let's examine that file.<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/buffers.py`,start_line:130}<tool_call|><|tool_response>
Generated tokens 158 tokens · stopped: STOP
Wait, I might have messed up the `read_file` call or there's some issue with the tool. Let me try again without start_line first to see if I can read the file.
Actually, looking at my previous `run_command`, the file exists at `/workspace/waitress/buffers.py`.
Wait, I tried `read_file{filepath: "waitress/buffers.py", start_line: 130}`. Maybe the file is not that long?
No, the grep output said line 132 has the class definition.
Let me try reading the whole file or a smaller chunk.
Wait, I might have messed up the `read_file` call or there's some issue with the tool. Let me try again without start_line first to see if I can read the file.
Actually, looking at my previous `run_command`, the file exists at `/workspace/waitress/buffers.py`.
Wait, I tried `read_file{filepath: "waitress/buffers.py", start_line: 130}`. Maybe the file is not that long?
No, the grep output said line 132 has the class definition.
Let me try reading the whole file or a smaller chunk.
<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/buffers.py<|"|>}<tool_call|><|tool_response>
Generated tokens 720 tokens · stopped: STOP
I see the issue in `ReadOnlyFileBasedBuffer.prepare`:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
As mentioned in the problem description, `io.IOBase` subclasses might have `seek` and `tell` methods, but they might raise `UnsupportedOperation` if the stream is not seekable.
Now let's create a reproduction script. I'll create a subclass of `io.IOBase` (or use `io.BufferedReader` on a non-seekable stream, or just a simple mock) that has `seek` and `tell` methods that raise `io.UnsupportedOperation`.
Actually, `io.TextIOWrapper` or `io.BufferedReader` wrapping a socket or pipe would work, but for a simple reproduction, a mock is easier.
Wait, I should use something that actually behaves like a non-seekable `io.IOBase` subclass.
```python
import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
buffer.prepare()
except io.UnsupportedOperation as e:
print(f"Caught expected exception: {e}")
except Exception as e:
print(f"Caught unexpected exception: {type(e).__name__}: {e}")
```
Let's run this reproduction.
I see the issue in `ReadOnlyFileBasedBuffer.prepare`:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
As mentioned in the problem description, `io.IOBase` subclasses might have `seek` and `tell` methods, but they might raise `UnsupportedOperation` if the stream is not seekable.
Now let's create a reproduction script. I'll create a subclass of `io.IOBase` (or use `io.BufferedReader` on a non-seekable stream, or just a simple mock) that has `seek` and `tell` methods that raise `io.UnsupportedOperation`.
Actually, `io.TextIOWrapper` or `io.BufferedReader` wrapping a socket or pipe would work, but for a simple reproduction, a mock is easier.
Wait, I should use something that actually behaves like a non-seekable `io.IOBase` subclass.
```python
import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
buffer.prepare()
except io.UnsupportedOperation as e:
print(f"Caught expected exception: {e}")
except Exception as e:
print(f"Caught unexpected exception: {type(e).__name__}: {e}")
```
Let's run this reproduction.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
buffer.prepare()
print("Success: prepare() worked")
except io.UnsupportedOperation as e:
print(f"Caught expected exception: {e}")
except Exception as e:
print(f"Caught unexpected exception: {type(e).__name__}: {e}")
PY
<|"|>}<tool_call|><|tool_response>
Generated tokens 1,080 tokens · stopped: STOP
The reproduction confirms that `buffer.prepare()` raises `io.UnsupportedOperation` when the file-like object has `seek` and `tell` methods but they are not supported.
The proposed fix is to either check `self.file.seekable()` or catch `io.UnsupportedOperation`.
Looking at the code again:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
If it's not seekable, `self.remain` is not initialized in `__init__`.
Wait, `ReadOnlyFileBasedBuffer` inherits from `FileBasedBuffer`.
```python
class FileBasedBuffer(object):
remain = 0
```
So `self.remain` will be 0 if not explicitly set.
But `prepare` returns `self.remain`.
If the file is not seekable, we can't know the size in advance using `seek`/`tell`. In that case, `self.remain` should probably stay 0 or be some indicator that the size is unknown.
If `self.remain` is 0, does that mean the buffer is empty or that we don't know?
The `FileBasedBuffer` usually manages a file it can write to and read from. `ReadOnlyFileBasedBuffer` is used for `wsgi.file_wrapper`.
If `prepare` returns 0, it might be interpreted as the file being empty. But for a non-seekable stream, we can only find out the size by reading it.
Wait, let's look at how `ReadOnlyFileBasedBuffer` is used. In `waitress/task.py` and `waitress/channel.py`.
Actually, the goal of `prepare` seems to be to determine the content length for the HTTP response. If it can't determine it, returning something that indicates "unknown" or just not setting `self.remain` might be correct. But `self.remain` is initialized to 0 in the base class.
Wait, if `self.remain` is 0, it might be wrong if the file is NOT empty but just non-seekable.
However, if it's non-seekable, you can't know the size without reading.
Let's see what happens if we just wrap the `seek`/`tell` block in a `try...except io.UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, `AttributeError` might be raised if `seekable()` was called but didn't exist. But we already checked `hasattr`.
Actually, `io.IOBase` has a `seekable()` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seekable') and self.file.seekable():
# ... seek and tell ...
```
Is `seekable()` always available on things that have `seek` and `tell`? Not necessarily.
The problem statement suggests:
"In `io.IOBase` subclasses that are not seekable, those two methods exist but raise an `UnsupportedOperation`, in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's try both. If I trap `io.UnsupportedOperation`, it's more robust for objects that don't implement `seekable()` but do implement `seek`/`tell` (or lack thereof).
Wait, if `self.remain` is 0, it might lead to `Content-Length: 0` or chunked encoding.
Let's see where `prepare` is called.
Grep for `.prepare(` in `/workspace`.
The reproduction confirms that `buffer.prepare()` raises `io.UnsupportedOperation` when the file-like object has `seek` and `tell` methods but they are not supported.
The proposed fix is to either check `self.file.seekable()` or catch `io.UnsupportedOperation`.
Looking at the code again:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
If it's not seekable, `self.remain` is not initialized in `__init__`.
Wait, `ReadOnlyFileBasedBuffer` inherits from `FileBasedBuffer`.
```python
class FileBasedBuffer(object):
remain = 0
```
So `self.remain` will be 0 if not explicitly set.
But `prepare` returns `self.remain`.
If the file is not seekable, we can't know the size in advance using `seek`/`tell`. In that case, `self.remain` should probably stay 0 or be some indicator that the size is unknown.
If `self.remain` is 0, does that mean the buffer is empty or that we don't know?
The `FileBasedBuffer` usually manages a file it can write to and read from. `ReadOnlyFileBasedBuffer` is used for `wsgi.file_wrapper`.
If `prepare` returns 0, it might be interpreted as the file being empty. But for a non-seekable stream, we can only find out the size by reading it.
Wait, let's look at how `ReadOnlyFileBasedBuffer` is used. In `waitress/task.py` and `waitress/channel.py`.
Actually, the goal of `prepare` seems to be to determine the content length for the HTTP response. If it can't determine it, returning something that indicates "unknown" or just not setting `self.remain` might be correct. But `self.remain` is initialized to 0 in the base class.
Wait, if `self.remain` is 0, it might be wrong if the file is NOT empty but just non-seekable.
However, if it's non-seekable, you can't know the size without reading.
Let's see what happens if we just wrap the `seek`/`tell` block in a `try...except io.UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, `AttributeError` might be raised if `seekable()` was called but didn't exist. But we already checked `hasattr`.
Actually, `io.IOBase` has a `seekable()` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seekable') and self.file.seekable():
# ... seek and tell ...
```
Is `seekable()` always available on things that have `seek` and `tell`? Not necessarily.
The problem statement suggests:
"In `io.IOBase` subclasses that are not seekable, those two methods exist but raise an `UnsupportedOperation`, in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's try both. If I trap `io.UnsupportedOperation`, it's more robust for objects that don't implement `seekable()` but do implement `seek`/`tell` (or lack thereof).
Wait, if `self.remain` is 0, it might lead to `Content-Length: 0` or chunked encoding.
Let's see where `prepare` is called.
Grep for `.prepare(` in `/workspace`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "\.prepare(" .<|"|>}<tool_call|><|tool_response>
Generated tokens 96 tokens · stopped: STOP
In `waitress/task.py`: ```python ./waitress/task.py:453: size = app_iter.prepare(cl) ``` Let's look at `waitress/task.py` around line 453.
In `waitress/task.py`:
```python
./waitress/task.py:453: size = app_iter.prepare(cl)
```
Let's look at `waitress/task.py` around line 453.
<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/task.py`,start_line:440,end_line:470}<tool_call|><|tool_response>
Generated tokens 174 tokens · stopped: STOP
I'm having issues with `read_file` using `start_line` and `end_line`. It seems it might be failing in the backend. I'll try reading the file without lines or in larger blocks if needed, but let me try once more without just `filepath`. Wait, I see what happened in the previous error: `path=%2Fworkspace%2Fwaitress%2Fbuffers.py%60%2Cstart_line%3A130`. It looks like the `start_line` and `end_line` are being passed as part of the path in the URL? That's weird. Let me try `read_file` again with only `filepath`.
I'm having issues with `read_file` using `start_line` and `end_line`. It seems it might be failing in the backend. I'll try reading the file without lines or in larger blocks if needed, but let me try once more without just `filepath`.
Wait, I see what happened in the previous error: `path=%2Fworkspace%2Fwaitress%2Fbuffers.py%60%2Cstart_line%3A130`. It looks like the `start_line` and `end_line` are being passed as part of the path in the URL? That's weird.
Let me try `read_file` again with only `filepath`.
<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/task.py<|"|>}<tool_call|><|tool_response>
Generated tokens 127 tokens · stopped: STOP
The file `waitress/task.py` is large. I'll try to read the relevant part using `tail` and `grep -C` since `read_file` seems to fail with `start_line`/`end_line` in some cases (although it might just be my misunderstanding of how it's used). Actually, I'll try `run_command` with `sed` to get the specific lines.
The file `waitress/task.py` is large. I'll try to read the relevant part using `tail` and `grep -C` since `read_file` seems to fail with `start_line`/`end_line` in some cases (although it might just be my misunderstanding of how it's used).
Actually, I'll try `run_command` with `sed` to get the specific lines.
<channel|><|tool_call>call:run_command{command:<|"|>sed -n '440,470p' waitress/task.py<|"|>}<tool_call|><|tool_response>
Generated tokens 1,725 tokens · stopped: STOP
Okay, so if `app_iter.prepare(cl)` returns a positive size, it's used to set the content length and the channel takes over writing it. If `prepare` returns 0 or is skipped, it falls back to iterating over `app_iter` and potentially using chunked encoding if `cl` was not set.
If `prepare` returns 0 for a non-seekable but non-empty file, it will be treated as an empty file (if `size` is 0 and `cl` is 0) or it will proceed to `for chunk in app_iter` which is correct for non-seekable files anyway.
Wait, if `size` is 0, `if size:` is false. So it will go to the `for chunk in app_iter` loop.
```python
size = app_iter.prepare(cl)
if size:
# ... use size ...
return
```
So if `prepare` returns 0 (which is the default `self.remain` in `FileBasedBuffer`), it just falls through to the chunked iteration. This is exactly what we want for non-seekable files.
So the fix is simply to make sure `prepare` doesn't raise `io.UnsupportedOperation` when calling `tell` or `seek`.
I will implement the fix by wrapping the seek/tell block in a `try...except (io.UnsupportedOperation, AttributeError)`. I include `AttributeError` just in case, although `hasattr` should cover it. `io.UnsupportedOperation` is the main one.
Actually, the problem statement says:
"in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's use `seekable()` if available, and fall back to trapping `UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
if hasattr(self.file, 'seekable') and not self.file.seekable():
return self.remain
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if I use `try...except`, the `hasattr(self.file, 'seekable')` check is redundant.
Let's just use the `try...except` block.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I need to make sure `io` is imported in `waitress/buffers.py`.
Looking at the beginning of `waitress/buffers.py`:
```python
from io import BytesIO
```
It only imports `BytesIO`. I should import `io` or `UnsupportedOperation` from `io`.
Let's check if `io` is already available or if I should add the import.
I will add `import io` at the top.
Wait, if I just do `import io`, I can use `io.UnsupportedOperation`.
Let's refine the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if `self.file` is just a file-like object that doesn't inherit from `io.IOBase`, it might not raise `io.UnsupportedOperation` but some other exception. But `io.UnsupportedOperation` is the standard for this.
Let's check how to best import `io`.
Current imports:
```python
from io import BytesIO
```
I'll change it to:
```python
import io
from io import BytesIO
```
Or just:
```python
import io
# ...
# and use io.BytesIO instead of BytesIO
```
But I should minimize changes.
I'll use:
```python
import io
from io import BytesIO
```
Wait, the existing code uses `BytesIO` directly.
```python
class BytesIOBasedBuffer(FileBasedBuffer):
def __init__(self, from_buffer=None):
if from_buffer is not None:
FileBasedBuffer.__init__(self, BytesIO(), from_buffer)
else:
# Shortcut. :-)
self.file = BytesIO()
def newfile(self):
return BytesIO()
```
So I will add `import io` at the top.
Wait, I should check if `ReadOnlyFileBasedBuffer`'s `prepare` is used anywhere else that might be affected.
It's used in `waitress/task.py`, `waitress/tests/test_buffers.py`, `waitress/tests/test_channel.py`.
The existing tests:
`waitress/tests/test_buffers.py`: calls `inst.prepare()`.
`waitress/tests/test_channel.py`: calls `wrapper.prepare()`.
Let's verify the fix with the reproduction script first.
Okay, so if `app_iter.prepare(cl)` returns a positive size, it's used to set the content length and the channel takes over writing it. If `prepare` returns 0 or is skipped, it falls back to iterating over `app_iter` and potentially using chunked encoding if `cl` was not set.
If `prepare` returns 0 for a non-seekable but non-empty file, it will be treated as an empty file (if `size` is 0 and `cl` is 0) or it will proceed to `for chunk in app_iter` which is correct for non-seekable files anyway.
Wait, if `size` is 0, `if size:` is false. So it will go to the `for chunk in app_iter` loop.
```python
size = app_iter.prepare(cl)
if size:
# ... use size ...
return
```
So if `prepare` returns 0 (which is the default `self.remain` in `FileBasedBuffer`), it just falls through to the chunked iteration. This is exactly what we want for non-seekable files.
So the fix is simply to make sure `prepare` doesn't raise `io.UnsupportedOperation` when calling `tell` or `seek`.
I will implement the fix by wrapping the seek/tell block in a `try...except (io.UnsupportedOperation, AttributeError)`. I include `AttributeError` just in case, although `hasattr` should cover it. `io.UnsupportedOperation` is the main one.
Actually, the problem statement says:
"in case of io.IOBase instance `.seekable` should probably be checked for `True` or the `UnsupportedOperation` should be trapped."
Let's use `seekable()` if available, and fall back to trapping `UnsupportedOperation`.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
if hasattr(self.file, 'seekable') and not self.file.seekable():
return self.remain
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if I use `try...except`, the `hasattr(self.file, 'seekable')` check is redundant.
Let's just use the `try...except` block.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I need to make sure `io` is imported in `waitress/buffers.py`.
Looking at the beginning of `waitress/buffers.py`:
```python
from io import BytesIO
```
It only imports `BytesIO`. I should import `io` or `UnsupportedOperation` from `io`.
Let's check if `io` is already available or if I should add the import.
I will add `import io` at the top.
Wait, if I just do `import io`, I can use `io.UnsupportedOperation`.
Let's refine the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, if `self.file` is just a file-like object that doesn't inherit from `io.IOBase`, it might not raise `io.UnsupportedOperation` but some other exception. But `io.UnsupportedOperation` is the standard for this.
Let's check how to best import `io`.
Current imports:
```python
from io import BytesIO
```
I'll change it to:
```python
import io
from io import BytesIO
```
Or just:
```python
import io
# ...
# and use io.BytesIO instead of BytesIO
```
But I should minimize changes.
I'll use:
```python
import io
from io import BytesIO
```
Wait, the existing code uses `BytesIO` directly.
```python
class BytesIOBasedBuffer(FileBasedBuffer):
def __init__(self, from_buffer=None):
if from_buffer is not None:
FileBasedBuffer.__init__(self, BytesIO(), from_buffer)
else:
# Shortcut. :-)
self.file = BytesIO()
def newfile(self):
return BytesIO()
```
So I will add `import io` at the top.
Wait, I should check if `ReadOnlyFileBasedBuffer`'s `prepare` is used anywhere else that might be affected.
It's used in `waitress/task.py`, `waitress/tests/test_buffers.py`, `waitress/tests/test_channel.py`.
The existing tests:
`waitress/tests/test_buffers.py`: calls `inst.prepare()`.
`waitress/tests/test_channel.py`: calls `wrapper.prepare()`.
Let's verify the fix with the reproduction script first.
<channel|><|tool_call>call:write_file{filepath:<|"|>/tmp/repro.py<|"|>,content:<|"|>import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
def test_prepare():
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
result = buffer.prepare()
print(f"Success: prepare() returned {result}")
except io.UnsupportedOperation as e:
print(f"Failure: Caught io.UnsupportedOperation: {e}")
except Exception as e:
print(f"Failure: Caught unexpected exception: {type(e).__name__}: {e}")
if __name__ == "__main__":
test_prepare()
<|"|>}<tool_call|><|tool_response>
Generated tokens 107 tokens · stopped: STOP
Ah, I forgot the rule about `/tmp`. I should just use `python3 - <<'PY'`. Let's apply the fix first and then run reproduction. Step 1: Add `import io`. Step 2: Update `prepare` method. Wait, I'll first check where to put `import io`.
Ah, I forgot the rule about `/tmp`. I should just use `python3 - <<'PY'`.
Let's apply the fix first and then run reproduction.
Step 1: Add `import io`.
Step 2: Update `prepare` method.
Wait, I'll first check where to put `import io`.
<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/buffers.py<|"|>,start_line:1,end_line:20}<tool_call|><|tool_response>
Generated tokens 170 tokens · stopped: STOP
I'll change `from io import BytesIO` to `import io` and then use `io.BytesIO`. Wait, if I change `BytesIO` to `io.BytesIO` in multiple places, it might be more changes than needed. I'll just add `import io` before `from io import BytesIO`. Actually, if I do: ```python import io from io import BytesIO ``` Then I can use both `io.UnsupportedOperation` and `BytesIO`. Now let's apply the edits.
I'll change `from io import BytesIO` to `import io` and then use `io.BytesIO`.
Wait, if I change `BytesIO` to `io.BytesIO` in multiple places, it might be more changes than needed.
I'll just add `import io` before `from io import BytesIO`.
Actually, if I do:
```python
import io
from io import BytesIO
```
Then I can use both `io.UnsupportedOperation` and `BytesIO`.
Now let's apply the edits.
<channel|><|tool_call>call:edit_file{filepath:<|"|>waitress/buffers.py<|"|>,new_string:<|"|>import io
from io import BytesIO
<|"|>,old_string:<|"|>from io import BytesIO
<|"|>}<tool_call|><|tool_response>
Generated tokens 632 tokens · stopped: STOP
Now the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
I will replace it with:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I should be careful with indentation.
Now the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain
```
I will replace it with:
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain
```
Wait, I should be careful with indentation.
<channel|><|tool_call>call:edit_file{filepath:<|"|>waitress/buffers.py<|"|>,new_string:<|"|> def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
try:
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
except (io.UnsupportedOperation, AttributeError):
pass
return self.remain<|"|>,old_string:<|"|> def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
start_pos = self.file.tell()
self.file.seek(0, 2)
end_pos = self.file.tell()
self.file.seek(start_pos)
fsize = end_pos - start_pos
if size is None:
self.remain = fsize
else:
self.remain = min(fsize, size)
return self.remain<|"|>}<tool_call|><|tool_response>
Generated tokens 265 tokens · stopped: STOP
Now let's run the reproduction script to verify it works.
Now let's run the reproduction script to verify it works.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import io
from waitress.buffers import ReadOnlyFileBasedBuffer
class NonSeekableIO(io.IOBase):
def read(self, size=-1):
return b"hello world"
def seek(self, offset, whence=0):
raise io.UnsupportedOperation("seek not supported")
def tell(self):
raise io.UnsupportedOperation("tell not supported")
def seekable(self):
return False
def test_prepare():
f = NonSeekableIO()
buffer = ReadOnlyFileBasedBuffer(f)
try:
result = buffer.prepare()
print(f"Success: prepare() returned {result}")
except io.UnsupportedOperation as e:
print(f"Failure: Caught io.UnsupportedOperation: {e}")
except Exception as e:
print(f"Failure: Caught unexpected exception: {type(e).__name__}: {e}")
if __name__ == "__main__":
test_prepare()
PY
<|"|>}<tool_call|><|tool_response>
Generated tokens 73 tokens · stopped: STOP
The reproduction now succeeds and returns 0, which is correct for a non-seekable file using the current logic. Now let's run existing tests to make sure no regression.
The reproduction now succeeds and returns 0, which is correct for a non-seekable file using the current logic.
Now let's run existing tests to make sure no regression.<channel|><|tool_call>call:run_command{command:<|"|>pytest waitress/tests/test_buffers.py -q --tb=short --no-header<|"|>}<tool_call|><|tool_response>
Generated tokens 81 tokens · stopped: STOP
Other tests might also be relevant. Let's run `waitress/tests/test_task.py` and `waitress/tests/test_channel.py`.
Other tests might also be relevant. Let's run `waitress/tests/test_task.py` and `waitress/tests/test_channel.py`.
<channel|><|tool_call>call:run_command{command:<|"|>pytest waitress/tests/test_task.py waitress/tests/test_channel.py -q --tb=short --no-header<|"|>}<tool_call|><|tool_response>
Generated tokens 129 tokens · stopped: STOP
All tests passed. Let's double check if I missed any parallel paths. `ReadOnlyFileBasedBuffer` is inheriting from `FileBasedBuffer`. The other buffers are `TempfileBasedBuffer` and `BytesIOBasedBuffer`. Do they need `prepare`? They are `FileBasedBuffer` subclasses, but they don't override `prepare`. Wait, `prepare` is only defined in `ReadOnlyFileBasedBuffer`. Let's check `waitress/buffers.py` again.
All tests passed.
Let's double check if I missed any parallel paths.
`ReadOnlyFileBasedBuffer` is inheriting from `FileBasedBuffer`.
The other buffers are `TempfileBasedBuffer` and `BytesIOBasedBuffer`.
Do they need `prepare`?
They are `FileBasedBuffer` subclasses, but they don't override `prepare`.
Wait, `prepare` is only defined in `ReadOnlyFileBasedBuffer`.
Let's check `waitress/buffers.py` again.<channel|><|tool_call>call:read_file{filepath:<|"|>waitress/buffers.py<|"|>}<tool_call|><|tool_response>
Generated tokens 202 tokens · stopped: STOP
Yes, `prepare` is only in `ReadOnlyFileBasedBuffer`. The `FileBasedBuffer` itself uses `tell` and `seek` in several places: `__init__`, `append`, `get`, `skip`, `prune`. But `FileBasedBuffer` is intended for writeable buffers (like `TempfileBasedBuffer` or `BytesIOBasedBuffer`), which are always seekable. `ReadOnlyFileBasedBuffer` is specifically for `wsgi.file_wrapper`, where the file provided by the WSGI app might be a non-seekable stream. If a user provides a non-seekable stream to `FileBasedBuffer` directly (which is not the intended use case, usually), it would crash. But the issue specifically mentioned `ReadOnlyFileBasedBuffer`. Let's verify `git status --short && git diff`.
Yes, `prepare` is only in `ReadOnlyFileBasedBuffer`.
The `FileBasedBuffer` itself uses `tell` and `seek` in several places: `__init__`, `append`, `get`, `skip`, `prune`.
But `FileBasedBuffer` is intended for writeable buffers (like `TempfileBasedBuffer` or `BytesIOBasedBuffer`), which are always seekable.
`ReadOnlyFileBasedBuffer` is specifically for `wsgi.file_wrapper`, where the file provided by the WSGI app might be a non-seekable stream.
If a user provides a non-seekable stream to `FileBasedBuffer` directly (which is not the intended use case, usually), it would crash. But the issue specifically mentioned `ReadOnlyFileBasedBuffer`.
Let's verify `git status --short && git diff`.
<channel|><|tool_call>call:run_command{command:<|"|>git status --short && git diff<|"|>}<tool_call|><|tool_response>
Generated tokens 163 tokens · stopped: STOP
The diff looks correct. Wait, I used `AttributeError` in the exception handler. Is it necessary? `hasattr(self.file, 'seek')` already checks for the existence of the method. However, some objects might implement `__getattr__` or other dynamic mechanisms that make `hasattr` return `True` but then raise `AttributeError` when called. Or maybe the `tell` method exists but `seek` does not (though we check both). Including `AttributeError` is safer and doesn't hurt. One detail: `io.UnsupportedOperation` is the standard exception for non-seekable streams in Python's `io` module. I am confident in the fix.
The diff looks correct.
Wait, I used `AttributeError` in the exception handler. Is it necessary?
`hasattr(self.file, 'seek')` already checks for the existence of the method.
However, some objects might implement `__getattr__` or other dynamic mechanisms that make `hasattr` return `True` but then raise `AttributeError` when called. Or maybe the `tell` method exists but `seek` does not (though we check both).
Including `AttributeError` is safer and doesn't hurt.
One detail: `io.UnsupportedOperation` is the standard exception for non-seekable streams in Python's `io` module.
I am confident in the fix.
<channel|><|tool_call>call:submit_patch{}<tool_call|><|tool_response>
Patch, tests and logs
Final code change Included
diff --git a/waitress/buffers.py b/waitress/buffers.py
index cacc094..24bbba2 100644
--- a/waitress/buffers.py
+++ b/waitress/buffers.py
@@ -13,6 +13,7 @@
##############################################################################
"""Buffers
"""
+import io
from io import BytesIO
# copy_bytes controls the size of temp. strings for shuffling data around.
@@ -138,15 +139,18 @@ class ReadOnlyFileBasedBuffer(FileBasedBuffer):
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr(self.file, 'tell'):
- start_pos = self.file.tell()
- self.file.seek(0, 2)
- end_pos = self.file.tell()
- self.file.seek(start_pos)
- fsize = end_pos - start_pos
- if size is None:
- self.remain = fsize
- else:
- self.remain = min(fsize, size)
+ try:
+ start_pos = self.file.tell()
+ self.file.seek(0, 2)
+ end_pos = self.file.tell()
+ self.file.seek(start_pos)
+ fsize = end_pos - start_pos
+ if size is None:
+ self.remain = fsize
+ else:
+ self.remain = min(fsize, size)
+ except (io.UnsupportedOperation, AttributeError):
+ pass
return self.remain
def get(self, numbytes=-1, skip=False):
Test output Included
============================= test session starts ============================== collected 123 items waitress/tests/test_functional.py ...................................... [ 30%] ........................................................................ [ 89%] ............. [100%] ==================================== PASSES ==================================== - generated xml file: /tmp/rebench-grade-7f4d7353be8a41e1b293b1061a61a57b.xml -- =========================== short test summary info ============================ PASSED waitress/tests/test_functional.py::SleepyThreadTests::test_it PASSED waitress/tests/test_functional.py::TcpEchoTests::test_bad_host_header PASSED waitress/tests/test_functional.py::TcpEchoTests::test_broken_chunked_encoding PASSED waitress/tests/test_functional.py::TcpEchoTests::test_chunking_request_with_content PASSED waitress/tests/test_functional.py::TcpEchoTests::test_chunking_request_without_content PASSED waitress/tests/test_functional.py::TcpEchoTests::test_date_and_server PASSED waitress/tests/test_functional.py::TcpEchoTests::test_keepalive_http10_explicit PASSED waitress/tests/test_functional.py::TcpEchoTests::test_keepalive_http11_connclose PASSED waitress/tests/test_functional.py::TcpEchoTests::test_keepalive_http11_explicit PASSED waitress/tests/test_functional.py::TcpEchoTests::test_keepalive_http_10 PASSED waitress/tests/test_functional.py::TcpEchoTests::test_keepalive_http_11 PASSED waitress/tests/test_functional.py::TcpEchoTests::test_large_body PASSED waitress/tests/test_functional.py::TcpEchoTests::test_many_clients PASSED waitress/tests/test_functional.py::TcpEchoTests::test_multiple_requests_with_body PASSED waitress/tests/test_functional.py::TcpEchoTests::test_multiple_requests_without_body PASSED waitress/tests/test_functional.py::TcpEchoTests::test_send_empty_body PASSED waitress/tests/test_functional.py::TcpEchoTests::test_send_with_body PASSED waitress/tests/test_functional.py::TcpEchoTests::test_without_crlf PASSED waitress/tests/test_functional.py::TcpPipeliningTests::test_pipelining PASSED waitress/tests/test_functional.py::TcpExpectContinueTests::test_expect_continue PASSED waitress/tests/test_functional.py::TcpBadContentLengthTests::test_long_body PASSED waitress/tests/test_functional.py::TcpBadContentLengthTests::test_short_body PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http10_generator PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http10_list PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http10_listlentwo PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http11_generator PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http11_list PASSED waitress/tests/test_functional.py::TcpNoContentLengthTests::test_http11_listlentwo PASSED waitress/tests/test_functional.py::TcpWriteCallbackTests::test_equal_body PASSED waitress/tests/test_functional.py::TcpWriteCallbackTests::test_long_body PASSED waitress/tests/test_functional.py::TcpWriteCallbackTests::test_no_content_length PASSED waitress/tests/test_functional.py::TcpWriteCallbackTests::test_short_body PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_chunked_encoding PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_no_cl_http10 PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_no_cl_http10_keepalive PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_no_cl_http11 PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_no_cl_http11_connclose PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_wrong_cl_http10 PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_wrong_cl_http10_keepalive PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_wrong_cl_http11 PASSED waitress/tests/test_functional.py::TcpTooLargeTests::test_request_body_too_large_with_wrong_cl_http11_connclose PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_after_start_response_http10 PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_after_start_response_http11 PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_after_start_response_http11_close PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_after_write_cb PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_before_start_response_http_10 PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_before_start_response_http_11 PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_before_start_response_http_11_close PASSED waitress/tests/test_functional.py::TcpInternalServerErrorTests::test_in_generator PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_http10 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_longcl_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_nocl_http10 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_nocl_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_filelike_shortcl_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_http10 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_iobase_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_longcl_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_nocl_http10 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_nocl_http11 PASSED waitress/tests/test_functional.py::TcpFileWrapperTests::test_notfilelike_shortcl_http11 PASSED waitress/tests/test_functional.py::UnixEchoTests::test_bad_host_header PASSED waitress/tests/test_functional.py::UnixEchoTests::test_broken_chunked_encoding PASSED waitress/tests/test_functional.py::UnixEchoTests::test_chunking_request_with_content PASSED waitress/tests/test_functional.py::UnixEchoTests::test_chunking_request_without_content PASSED waitress/tests/test_functional.py::UnixEchoTests::test_date_and_server PASSED waitress/tests/test_functional.py::UnixEchoTests::test_keepalive_http10_explicit PASSED waitress/tests/test_functional.py::UnixEchoTests::test_keepalive_http11_connclose PASSED waitress/tests/test_functional.py::UnixEchoTests::test_keepalive_http11_explicit PASSED waitress/tests/test_functional.py::UnixEchoTests::test_keepalive_http_10 PASSED waitress/tests/test_functional.py::UnixEchoTests::test_keepalive_http_11 PASSED waitress/tests/test_functional.py::UnixEchoTests::test_large_body PASSED waitress/tests/test_functional.py::UnixEchoTests::test_many_clients PASSED waitress/tests/test_functional.py::UnixEchoTests::test_multiple_requests_with_body PASSED waitress/tests/test_functional.py::UnixEchoTests::test_multiple_requests_without_body PASSED waitress/tests/test_functional.py::UnixEchoTests::test_send_empty_body PASSED waitress/tests/test_functional.py::UnixEchoTests::test_send_with_body PASSED waitress/tests/test_functional.py::UnixEchoTests::test_without_crlf PASSED waitress/tests/test_functional.py::UnixPipeliningTests::test_pipelining PASSED waitress/tests/test_functional.py::UnixExpectContinueTests::test_expect_continue PASSED waitress/tests/test_functional.py::UnixBadContentLengthTests::test_long_body PASSED waitress/tests/test_functional.py::UnixBadContentLengthTests::test_short_body PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http10_generator PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http10_list PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http10_listlentwo PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http11_generator PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http11_list PASSED waitress/tests/test_functional.py::UnixNoContentLengthTests::test_http11_listlentwo PASSED waitress/tests/test_functional.py::UnixWriteCallbackTests::test_equal_body PASSED waitress/tests/test_functional.py::UnixWriteCallbackTests::test_long_body PASSED waitress/tests/test_functional.py::UnixWriteCallbackTests::test_no_content_length PASSED waitress/tests/test_functional.py::UnixWriteCallbackTests::test_short_body PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_chunked_encoding PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_no_cl_http10 PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_no_cl_http10_keepalive PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_no_cl_http11 PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_no_cl_http11_connclose PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_wrong_cl_http10 PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_wrong_cl_http10_keepalive PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_wrong_cl_http11 PASSED waitress/tests/test_functional.py::UnixTooLargeTests::test_request_body_too_large_with_wrong_cl_http11_connclose PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_after_start_response_http10 PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_after_start_response_http11 PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_after_start_response_http11_close PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_after_write_cb PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_before_start_response_http_10 PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_before_start_response_http_11 PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_before_start_response_http_11_close PASSED waitress/tests/test_functional.py::UnixInternalServerErrorTests::test_in_generator PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_http10 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_longcl_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_nocl_http10 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_nocl_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_filelike_shortcl_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_http10 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_iobase_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_longcl_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_nocl_http10 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_nocl_http11 PASSED waitress/tests/test_functional.py::UnixFileWrapperTests::test_notfilelike_shortcl_http11 ============================= 123 passed in 3.61s ==============================
Test errors Included
Test report (JUnit) Included
<?xml version="1.0" encoding="utf-8"?><testsuites><testsuite errors="0" failures="0" hostname="fcdef78bd9f0" name="pytest" skipped="0" tests="123" time="3.613" timestamp="2026-11-14T04:45:15.616516"><testcase classname="waitress.tests.test_functional.SleepyThreadTests" name="test_it" time="3.017" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_bad_host_header" time="0.006" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_broken_chunked_encoding" time="0.006" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_chunking_request_with_content" time="0.006" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_chunking_request_without_content" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_date_and_server" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_keepalive_http10_explicit" time="0.006" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_keepalive_http11_connclose" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_keepalive_http11_explicit" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_keepalive_http_10" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_keepalive_http_11" time="0.006" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_large_body" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_many_clients" time="0.021" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_multiple_requests_with_body" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_multiple_requests_without_body" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_send_empty_body" time="0.005" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_send_with_body" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpEchoTests" name="test_without_crlf" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpPipeliningTests" name="test_pipelining" time="0.009" /><testcase classname="waitress.tests.test_functional.TcpExpectContinueTests" name="test_expect_continue" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpBadContentLengthTests" name="test_long_body" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpBadContentLengthTests" name="test_short_body" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http10_generator" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http10_list" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http10_listlentwo" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http11_generator" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http11_list" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpNoContentLengthTests" name="test_http11_listlentwo" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpWriteCallbackTests" name="test_equal_body" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpWriteCallbackTests" name="test_long_body" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpWriteCallbackTests" name="test_no_content_length" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpWriteCallbackTests" name="test_short_body" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_chunked_encoding" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_no_cl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_no_cl_http10_keepalive" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_no_cl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_no_cl_http11_connclose" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http10_keepalive" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http11_connclose" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_after_start_response_http10" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_after_start_response_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_after_start_response_http11_close" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_after_write_cb" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_before_start_response_http_10" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_before_start_response_http_11" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_before_start_response_http_11_close" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpInternalServerErrorTests" name="test_in_generator" time="0.004" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_longcl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_nocl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_nocl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_filelike_shortcl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_iobase_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_longcl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_nocl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_nocl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.TcpFileWrapperTests" name="test_notfilelike_shortcl_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_bad_host_header" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_broken_chunked_encoding" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_chunking_request_with_content" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_chunking_request_without_content" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_date_and_server" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_keepalive_http10_explicit" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_keepalive_http11_connclose" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_keepalive_http11_explicit" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_keepalive_http_10" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_keepalive_http_11" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_large_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_many_clients" time="0.018" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_multiple_requests_with_body" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_multiple_requests_without_body" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_send_empty_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_send_with_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixEchoTests" name="test_without_crlf" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixPipeliningTests" name="test_pipelining" time="0.008" /><testcase classname="waitress.tests.test_functional.UnixExpectContinueTests" name="test_expect_continue" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixBadContentLengthTests" name="test_long_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixBadContentLengthTests" name="test_short_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http10_generator" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http10_list" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http10_listlentwo" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http11_generator" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http11_list" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixNoContentLengthTests" name="test_http11_listlentwo" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixWriteCallbackTests" name="test_equal_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixWriteCallbackTests" name="test_long_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixWriteCallbackTests" name="test_no_content_length" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixWriteCallbackTests" name="test_short_body" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_chunked_encoding" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_no_cl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_no_cl_http10_keepalive" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_no_cl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_no_cl_http11_connclose" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http10_keepalive" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixTooLargeTests" name="test_request_body_too_large_with_wrong_cl_http11_connclose" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_after_start_response_http10" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_after_start_response_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_after_start_response_http11_close" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_after_write_cb" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_before_start_response_http_10" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_before_start_response_http_11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_before_start_response_http_11_close" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixInternalServerErrorTests" name="test_in_generator" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_http10" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_http11" time="0.003" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_longcl_http11" time="0.005" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_nocl_http10" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_nocl_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_filelike_shortcl_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_http10" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_iobase_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_longcl_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_nocl_http10" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_nocl_http11" time="0.004" /><testcase classname="waitress.tests.test_functional.UnixFileWrapperTests" name="test_notfilelike_shortcl_http11" time="0.004" /></testsuite></testsuites>
Agent log Included
[ 0.0s] 📋 System Prompt: You are a principal Python software engineer resolving a repository issue in `/workspace`.
[ 0.0s] 🎯 Task Prompt: You are evaluating a software engineering task for repository Pylons/waitress.
[ 18.6s] 💭 (670 chars) "The user is reporting a bug in `ReadOnlyFileBasedBuffer` in `waitress/buffers.py`.
It seems `ReadOnlyFileBasedBuffer` as..."
[ 18.6s] 🔧 run_command grep -rn --include="*.py" "ReadOnlyFileBasedBuffer" .
[ 18.6s] → ./waitress/buffers.py:132:class ReadOnlyFileBasedBuffer(FileBasedBuffer):
[ 22.8s] 💭 (74 chars) "Okay, the core logic is in `waitress/buffers.py`. Let's examine that file."
[ 22.8s] 📖 read_file (waitress/buffers.py`,start_line:130)
[ 22.8s] ❌ {'status': 'error', 'error_type': 'FileReadError', 'error_message': '404 Client Error for
http+docker://localhost/v1.52/…
[ 34.4s] 💭 (485 chars) "Wait, I might have messed up the `read_file` call or there's some issue with the tool. Let
me try again without start_li..."
[ 34.4s] 📖 read_file (waitress/buffers.py)
[ 34.4s] ✓ {'status': 'ok', 'filepath': 'waitress/buffers.py', 'content':
'########################################################…
[ 74.7s] 💭 (1839 chars) "I see the issue in `ReadOnlyFileBasedBuffer.prepare`:
```python
def prepare(self, size=None):
if hasattr(se..."
[ 74.7s] 🔧 run_command (24 lines) python3 - <<'PY'
[ 74.8s] → Caught expected exception: tell not supported
[ 146.2s] 💭 (3876 chars) "The reproduction confirms that `buffer.prepare()` raises `io.UnsupportedOperation` when the
file-like object has `seek` ..."
[ 146.2s] 🔧 run_command grep -rn "\.prepare(" .
[ 146.3s] → ./waitress/task.py:453: size = app_iter.prepare(cl)
[ 154.6s] 💭 (154 chars) "In `waitress/task.py`:
```python
./waitress/task.py:453: size = app_iter.prepare(cl)
```
Let's look at `..."
[ 154.6s] 📖 read_file (waitress/task.py`,start_line:440,end_line:470)
[ 154.7s] ❌ {'status': 'error', 'error_type': 'FileReadError', 'error_message': '404 Client Error for
http+docker://localhost/v1.52/…
[ 165.8s] 💭 (513 chars) "I'm having issues with `read_file` using `start_line` and `end_line`. It seems it might be
failing in the backend. I'll ..."
[ 165.8s] 📖 read_file (waitress/task.py)
[ 165.9s] ✓ {'status': 'ok', 'filepath': 'waitress/task.py', 'content':
'###########################################################…
[ 174.6s] 💭 (312 chars) "The file `waitress/task.py` is large. I'll try to read the relevant part using `tail` and
`grep -C` since `read_file` se..."
[ 174.6s] 🔧 run_command sed -n '440,470p' waitress/task.py
[ 174.7s] 🔧
[ 276.7s] 💭 (5431 chars) "Okay, so if `app_iter.prepare(cl)` returns a positive size, it's used to set the content
length and the channel takes ov..."
[ 276.7s] 📝 write_file (/tmp/repro.py, 26 lines)
[ 276.7s] ❌ {'status': 'error', 'error_type': 'FileWriteError', 'error_message': "Path traversal detected:
'/tmp/repro.py' escapes w…
[ 284.5s] 💭 (236 chars) "Ah, I forgot the rule about `/tmp`. I should just use `python3 - <<'PY'`.
Let's apply the fix first and then run reprod..."
[ 284.5s] 📖 read_file (waitress/buffers.py)
[ 284.6s] ✓ {'status': 'ok', 'filepath': 'waitress/buffers.py', 'content':
'########################################################…
[ 293.7s] 💭 (395 chars) "I'll change `from io import BytesIO` to `import io` and then use `io.BytesIO`.
Wait, if I change `BytesIO` to `io.BytesI..."
[ 293.7s] ✏️ edit_file (waitress/buffers.py)
[ 293.9s] ✓ {'status': 'ok', 'filepath': 'waitress/buffers.py', 'occurrences': 1, 'strategy': 'exact', 'diff': '---
a/waitress/buffe…
[ 319.7s] 💭 (1165 chars) "Now the `prepare` method.
```python
def prepare(self, size=None):
if hasattr(self.file, 'seek') and hasattr..."
[ 319.7s] ✏️ edit_file (waitress/buffers.py)
[ 319.8s] ✓ {'status': 'ok', 'filepath': 'waitress/buffers.py', 'occurrences': 1, 'strategy': 'exact', 'diff': "---
a/waitress/buffe…
[ 327.5s] 💭 (57 chars) "Now let's run the reproduction script to verify it works."
[ 327.5s] 🔧 run_command (28 lines) python3 - <<'PY'
[ 327.6s] → Success: prepare() returned 0
[ 332.2s] 💭 (168 chars) "The reproduction now succeeds and returns 0, which is correct for a non-seekable file using
the current logic.
Now let'..."
[ 332.2s] 🔧 run_command pytest waitress/tests/test_buffers.py -q --tb=short --no-header
[ 332.4s] → .................................................... [100%]
[ 336.8s] 💭 (113 chars) "Other tests might also be relevant. Let's run `waitress/tests/test_task.py` and
`waitress/tests/test_channel.py`."
[ 336.8s] 🔧 run_command pytest waitress/tests/test_task.py waitress/tests/test_channel.py -q --tb=short
[ 337.1s] → ........................................................................ [ 44%]
[ 345.8s] 💭 (405 chars) "All tests passed.
Let's double check if I missed any parallel paths.
`ReadOnlyFileBasedBuffer` is inheriting from `File..."
[ 345.8s] 📖 read_file (waitress/buffers.py)
[ 345.8s] ✓ {'status': 'ok', 'filepath': 'waitress/buffers.py', 'content':
'########################################################…
[ 362.0s] 💭 (693 chars) "Yes, `prepare` is only in `ReadOnlyFileBasedBuffer`.
The `FileBasedBuffer` itself uses `tell` and `seek` in several pla..."
[ 362.0s] 🔧 run_command git status --short && git diff
[ 362.1s] → M waitress/buffers.py
[ 437.4s] 💭 (608 chars) "The diff looks correct.
Wait, I used `AttributeError` in the exception handler. Is it necessary?
`hasattr(self.file, 's..."
[ 437.4s] 🤖 submit_patch
[ 437.5s] → submit_patch: {"status": "ok", "patch_size": 1417, "files_changed": 1}
[ 445.7s] 💭 (220 chars) "The patch is submitted. I have reproduced the bug, fixed it by wrapping the seek/tell
operations in a try-except block t..."
[ 445.7s] ✅ Agent finished: The bug where `ReadOnlyFileBasedBuffer.prepare` crashed when handling non-seekable
`io.IOBase` subclasses was fixed by wrapping the `seek` and `tell` operations in a `try...except (io.UnsupportedOpera...
Native result row
{
"agent_error": null,
"duration_seconds": 452.56,
"error": null,
"grade": {
"collected_tests": 123,
"competition_junit_ok": true,
"error": null,
"required_issues_count": 0,
"resolved": true,
"status_counts": {
"PASSED": 123
},
"strict_clean_patch": true,
"test_exit_code": 0
},
"instance_id": "pylons__waitress-249",
"pass_idx": 0,
"patch_chars": 1417,
"phase1_seconds": 448.31,
"repo": "Pylons/waitress",
"request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/pylons__waitress-249__p0__r6.jsonl",
"resolved": true,
"rollout_idx": 6,
"run_key": "pylons__waitress-249__p0__r6",
"strict_clean_patch": true,
"tool_calls": 17,
"total_llm_calls": 19,
"trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_pylons__waitress-249__p0__r6.json"
}