[BUG] Failing on a class with __getattr__ method

[xuhcc]

Describe the bug

I upgraded to pytkdocs 0.5.1 and got this error:

ERROR   -  mkdocstrings.handlers.python: Collection failed: ('No route with that name.', '__wrapped__')
Traceback (most recent call last):
  File "/venv/lib/python3.8/site-packages/pytkdocs/cli.py", line 193, in main
    output = json.dumps(process_json(line))
  File "/venv/lib/python3.8/site-packages/pytkdocs/cli.py", line 114, in process_json
    return process_config(json.loads(json_input))
  File "/venv/lib/python3.8/site-packages/pytkdocs/cli.py", line 91, in process_config
    obj = loader.get_object_documentation(path, members)
  File "/venv/lib/python3.8/site-packages/pytkdocs/loader.py", line 230, in get_object_documentation
    root_object = self.get_module_documentation(leaf, members)
  File "/venv/lib/python3.8/site-packages/pytkdocs/loader.py", line 311, in get_module_documentation
    root_object.add_child(self.get_module_documentation(leaf))
  File "/venv/lib/python3.8/site-packages/pytkdocs/loader.py", line 295, in get_module_documentation
    child_node = ObjectNode(member, member_name, parent=node)
  File "/venv/lib/python3.8/site-packages/pytkdocs/loader.py", line 43, in __init__
    self.obj: Any = inspect.unwrap(obj)
  File "/usr/lib/python3.8/inspect.py", line 520, in unwrap
    while _is_wrapper(func):
  File "/usr/lib/python3.8/inspect.py", line 511, in _is_wrapper
    return hasattr(f, '__wrapped__')
  File "/venv/lib/python3.8/site-packages/beancount/web/bottle_utils.py", line 25, in __getattr__
    return self.mapper_function(name)
  File "/venv/bin/bottle.py", line 409, in build
    if not builder: raise RouteBuildError("No route with that name.", _name)
bottle.RouteBuildError: ('No route with that name.', '__wrapped__')
 
ERROR   -  mkdocstrings.extension: Could not collect 'beancount.web' 
ERROR   -  Error reading page 'api_reference/beancount.web.md': ('No route with that name.', '__wrapped__') 
Traceback (most recent call last):
  File "build.py", line 52, in <module>
    sys.exit(cli())
  File "/venv/lib/python3.8/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/venv/lib/python3.8/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/venv/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/venv/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/venv/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/venv/lib/python3.8/site-packages/mkdocs/__main__.py", line 140, in serve_command
    serve.serve(
  File "/venv/lib/python3.8/site-packages/mkdocs/commands/serve.py", line 141, in serve
    config = builder()
  File "/venv/lib/python3.8/site-packages/mkdocs/commands/serve.py", line 136, in builder
    build(config, live_server=live_server, dirty=dirty)
  File "/venv/lib/python3.8/site-packages/mkdocs/commands/build.py", line 274, in build
    _populate_page(file.page, config, files, dirty)
  File "/venv/lib/python3.8/site-packages/mkdocs/commands/build.py", line 174, in _populate_page
    page.render(config, files)
  File "/venv/lib/python3.8/site-packages/mkdocs/structure/pages.py", line 183, in render
    self.content = md.convert(self.markdown)
  File "/venv/lib/python3.8/site-packages/markdown/core.py", line 263, in convert
    root = self.parser.parseDocument(self.lines).getroot()
  File "/venv/lib/python3.8/site-packages/markdown/blockparser.py", line 90, in parseDocument
    self.parseChunk(self.root, '\n'.join(lines))
  File "/venv/lib/python3.8/site-packages/markdown/blockparser.py", line 105, in parseChunk
    self.parseBlocks(parent, text.split('\n\n'))
  File "/venv/lib/python3.8/site-packages/markdown/blockparser.py", line 123, in parseBlocks
    if processor.run(parent, blocks) is not False:
  File "/venv/lib/python3.8/site-packages/mkdocstrings/extension.py", line 147, in run
    data: Any = handler.collector.collect(identifier, selection)
  File "/venv/lib/python3.8/site-packages/mkdocstrings/handlers/python.py", line 204, in collect
    raise CollectionError(result["error"])
mkdocstrings.handlers.CollectionError: ('No route with that name.', '__wrapped__')

Here's the relevant source code:

https://github.com/beancount/beancount/blob/2.3.0/beancount/web/bottle_utils.py#L24-L25

System (please complete the following information):

• pytkdocs version: 0.5.1
• Python version: 3.8
• OS: Arch Linux

[pawamoy]

I'm always amazed by the flexibility of Python. inspect.unwrap calls hasattr on the object, triggering its __getattr__ method which in turn calls a mapper function that was passed to it, and defined in the bottle script I guess.

Well, I guess the obvious fix is to catch every exception when unwrapping:

try:
    member = inspect.unwrap(member)
except Exception:
    pass

Thanks for the report :)

I'll fix this and release asap

[pawamoy]

Released version 0.5.2 🙂

[xuhcc]

Thank you! The problem is gone.