360 lines
13 KiB
Python
360 lines
13 KiB
Python
# Copyright (c) 2009-2012 testtools developers. See LICENSE for details.
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"""Content - a MIME-like Content object."""
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__all__ = [
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'attach_file',
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'Content',
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'content_from_file',
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'content_from_stream',
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'json_content',
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'text_content',
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'TracebackContent',
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]
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import codecs
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import functools
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import json
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import os
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import traceback
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from testtools.compat import _b
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from testtools.content_type import ContentType, JSON, UTF8_TEXT
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_join_b = _b("").join
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DEFAULT_CHUNK_SIZE = 4096
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STDOUT_LINE = '\nStdout:\n%s'
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STDERR_LINE = '\nStderr:\n%s'
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def _iter_chunks(stream, chunk_size, seek_offset=None, seek_whence=0):
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"""Read 'stream' in chunks of 'chunk_size'.
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:param stream: A file-like object to read from.
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:param chunk_size: The size of each read from 'stream'.
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:param seek_offset: If non-None, seek before iterating.
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:param seek_whence: Pass through to the seek call, if seeking.
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"""
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if seek_offset is not None:
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stream.seek(seek_offset, seek_whence)
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chunk = stream.read(chunk_size)
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while chunk:
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yield chunk
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chunk = stream.read(chunk_size)
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class Content:
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"""A MIME-like Content object.
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'Content' objects can be serialised to bytes using the iter_bytes method.
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If the 'Content-Type' is recognised by other code, they are welcome to
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look for richer contents that mere byte serialisation - for example in
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memory object graphs etc. However, such code MUST be prepared to receive
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a generic 'Content' object that has been reconstructed from a byte stream.
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:ivar content_type: The content type of this Content.
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"""
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def __init__(self, content_type, get_bytes):
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"""Create a ContentType."""
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if None in (content_type, get_bytes):
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raise ValueError("None not permitted in {!r}, {!r}".format(
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content_type, get_bytes))
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self.content_type = content_type
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self._get_bytes = get_bytes
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def __eq__(self, other):
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return (self.content_type == other.content_type and
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_join_b(self.iter_bytes()) == _join_b(other.iter_bytes()))
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def as_text(self):
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"""Return all of the content as text.
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This is only valid where ``iter_text`` is. It will load all of the
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content into memory. Where this is a concern, use ``iter_text``
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instead.
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"""
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return ''.join(self.iter_text())
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def iter_bytes(self):
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"""Iterate over bytestrings of the serialised content."""
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return self._get_bytes()
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def iter_text(self):
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"""Iterate over the text of the serialised content.
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This is only valid for text MIME types, and will use ISO-8859-1 if
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no charset parameter is present in the MIME type. (This is somewhat
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arbitrary, but consistent with RFC2617 3.7.1).
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:raises ValueError: If the content type is not "text/*".
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"""
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if self.content_type.type != "text":
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raise ValueError("Not a text type %r" % self.content_type)
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return self._iter_text()
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def _iter_text(self):
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"""Worker for iter_text - does the decoding."""
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encoding = self.content_type.parameters.get('charset', 'ISO-8859-1')
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decoder = codecs.getincrementaldecoder(encoding)()
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for bytes in self.iter_bytes():
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yield decoder.decode(bytes)
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final = decoder.decode(_b(''), True)
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if final:
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yield final
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def __repr__(self):
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return "<Content type={!r}, value={!r}>".format(
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self.content_type, _join_b(self.iter_bytes()))
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class StackLinesContent(Content):
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"""Content object for stack lines.
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This adapts a list of "preprocessed" stack lines into a 'Content' object.
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The stack lines are most likely produced from ``traceback.extract_stack``
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or ``traceback.extract_tb``.
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text/x-traceback;language=python is used for the mime type, in order to
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provide room for other languages to format their tracebacks differently.
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"""
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# Whether or not to hide layers of the stack trace that are
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# unittest/testtools internal code. Defaults to True since the
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# system-under-test is rarely unittest or testtools.
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HIDE_INTERNAL_STACK = True
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def __init__(self, stack_lines, prefix_content="", postfix_content=""):
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"""Create a StackLinesContent for ``stack_lines``.
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:param stack_lines: A list of preprocessed stack lines, probably
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obtained by calling ``traceback.extract_stack`` or
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``traceback.extract_tb``.
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:param prefix_content: If specified, a unicode string to prepend to the
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text content.
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:param postfix_content: If specified, a unicode string to append to the
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text content.
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"""
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content_type = ContentType('text', 'x-traceback',
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{"language": "python", "charset": "utf8"})
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value = prefix_content + \
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self._stack_lines_to_unicode(stack_lines) + \
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postfix_content
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super().__init__(
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content_type, lambda: [value.encode("utf8")])
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def _stack_lines_to_unicode(self, stack_lines):
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"""Converts a list of pre-processed stack lines into a unicode string.
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"""
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msg_lines = traceback.format_list(stack_lines)
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return ''.join(msg_lines)
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class TracebackContent(Content):
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"""Content object for tracebacks.
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This adapts an exc_info tuple to the 'Content' interface.
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'text/x-traceback;language=python' is used for the mime type, in order to
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provide room for other languages to format their tracebacks differently.
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"""
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def __init__(self, err, test, capture_locals=False):
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"""Create a TracebackContent for ``err``.
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:param err: An exc_info error tuple.
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:param test: A test object used to obtain failureException.
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:param capture_locals: If true, show locals in the traceback.
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"""
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if err is None:
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raise ValueError("err may not be None")
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exctype, value, tb = err
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# Skip test runner traceback levels
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if StackLinesContent.HIDE_INTERNAL_STACK:
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while tb and '__unittest' in tb.tb_frame.f_globals:
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tb = tb.tb_next
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limit = None
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# Disabled due to https://bugs.launchpad.net/testtools/+bug/1188420
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if (False
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and StackLinesContent.HIDE_INTERNAL_STACK
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and test.failureException
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and isinstance(value, test.failureException)):
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# Skip assert*() traceback levels
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limit = 0
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while tb and not self._is_relevant_tb_level(tb):
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limit += 1
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tb = tb.tb_next
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stack_lines = list(traceback.TracebackException(exctype, value, tb,
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limit=limit, capture_locals=capture_locals).format())
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content_type = ContentType('text', 'x-traceback',
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{"language": "python", "charset": "utf8"})
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super().__init__(
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content_type, lambda: [x.encode('utf8') for x in stack_lines])
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def StacktraceContent(prefix_content="", postfix_content=""):
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"""Content object for stack traces.
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This function will create and return a 'Content' object that contains a
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stack trace.
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The mime type is set to 'text/x-traceback;language=python', so other
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languages can format their stack traces differently.
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:param prefix_content: A unicode string to add before the stack lines.
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:param postfix_content: A unicode string to add after the stack lines.
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"""
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stack = traceback.walk_stack(None)
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def filter_stack(stack):
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# Discard the filter_stack frame.
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next(stack)
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# Discard the StacktraceContent frame.
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next(stack)
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for f, f_lineno in stack:
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if StackLinesContent.HIDE_INTERNAL_STACK:
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if '__unittest' in f.f_globals:
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return
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yield f, f_lineno
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extract = traceback.StackSummary.extract(filter_stack(stack))
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extract.reverse()
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return StackLinesContent(extract, prefix_content, postfix_content)
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def json_content(json_data):
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"""Create a JSON Content object from JSON-encodeable data."""
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data = json.dumps(json_data)
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# The json module perversely returns native str not bytes
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data = data.encode('utf8')
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return Content(JSON, lambda: [data])
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def text_content(text):
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"""Create a Content object from some text.
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This is useful for adding details which are short strings.
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"""
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if not isinstance(text, str):
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raise TypeError(
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"text_content must be given text, not '%s'." % type(text).__name__
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)
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return Content(UTF8_TEXT, lambda: [text.encode('utf8')])
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def maybe_wrap(wrapper, func):
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"""Merge metadata for func into wrapper if functools is present."""
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if functools is not None:
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wrapper = functools.update_wrapper(wrapper, func)
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return wrapper
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def content_from_file(path, content_type=None, chunk_size=DEFAULT_CHUNK_SIZE,
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buffer_now=False, seek_offset=None, seek_whence=0):
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"""Create a Content object from a file on disk.
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Note that unless ``buffer_now`` is explicitly passed in as True, the file
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will only be read from when ``iter_bytes`` is called.
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:param path: The path to the file to be used as content.
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:param content_type: The type of content. If not specified, defaults
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to UTF8-encoded text/plain.
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:param chunk_size: The size of chunks to read from the file.
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Defaults to ``DEFAULT_CHUNK_SIZE``.
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:param buffer_now: If True, read the file from disk now and keep it in
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memory. Otherwise, only read when the content is serialized.
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:param seek_offset: If non-None, seek within the stream before reading it.
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:param seek_whence: If supplied, pass to ``stream.seek()`` when seeking.
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"""
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if content_type is None:
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content_type = UTF8_TEXT
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def reader():
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with open(path, 'rb') as stream:
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yield from _iter_chunks(stream,
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chunk_size,
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seek_offset,
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seek_whence)
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return content_from_reader(reader, content_type, buffer_now)
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def content_from_stream(stream, content_type=None,
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chunk_size=DEFAULT_CHUNK_SIZE, buffer_now=False,
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seek_offset=None, seek_whence=0):
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"""Create a Content object from a file-like stream.
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Note that unless ``buffer_now`` is explicitly passed in as True, the stream
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will only be read from when ``iter_bytes`` is called.
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:param stream: A file-like object to read the content from. The stream
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is not closed by this function or the 'Content' object it returns.
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:param content_type: The type of content. If not specified, defaults
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to UTF8-encoded text/plain.
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:param chunk_size: The size of chunks to read from the file.
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Defaults to ``DEFAULT_CHUNK_SIZE``.
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:param buffer_now: If True, reads from the stream right now. Otherwise,
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only reads when the content is serialized. Defaults to False.
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:param seek_offset: If non-None, seek within the stream before reading it.
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:param seek_whence: If supplied, pass to ``stream.seek()`` when seeking.
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"""
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if content_type is None:
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content_type = UTF8_TEXT
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def reader():
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return _iter_chunks(stream, chunk_size, seek_offset, seek_whence)
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return content_from_reader(reader, content_type, buffer_now)
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def content_from_reader(reader, content_type, buffer_now):
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"""Create a Content object that will obtain the content from reader.
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:param reader: A callback to read the content. Should return an iterable of
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bytestrings.
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:param content_type: The content type to create.
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:param buffer_now: If True the reader is evaluated immediately and
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buffered.
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"""
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if content_type is None:
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content_type = UTF8_TEXT
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if buffer_now:
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contents = list(reader())
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def reader():
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return contents
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return Content(content_type, reader)
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def attach_file(detailed, path, name=None, content_type=None,
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chunk_size=DEFAULT_CHUNK_SIZE, buffer_now=True):
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"""Attach a file to this test as a detail.
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This is a convenience method wrapping around ``addDetail``.
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Note that by default the contents of the file will be read immediately. If
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``buffer_now`` is False, then the file *must* exist when the test result is
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called with the results of this test, after the test has been torn down.
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:param detailed: An object with details
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:param path: The path to the file to attach.
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:param name: The name to give to the detail for the attached file.
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:param content_type: The content type of the file. If not provided,
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defaults to UTF8-encoded text/plain.
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:param chunk_size: The size of chunks to read from the file. Defaults
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to something sensible.
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:param buffer_now: If False the file content is read when the content
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object is evaluated rather than when attach_file is called.
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Note that this may be after any cleanups that obj_with_details has, so
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if the file is a temporary file disabling buffer_now may cause the file
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to be read after it is deleted. To handle those cases, using
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attach_file as a cleanup is recommended because it guarantees a
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sequence for when the attach_file call is made::
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detailed.addCleanup(attach_file, 'foo.txt', detailed)
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"""
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if name is None:
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name = os.path.basename(path)
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content_object = content_from_file(
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path, content_type, chunk_size, buffer_now)
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detailed.addDetail(name, content_object)
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