terry@google.com
ecceb75d35
BUG= R=vsm@google.com Committed: https://code.google.com/p/dart/source/detail?r=39948 Review URL: https://codereview.chromium.org//444743002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40026 260f80e4-7a28-3924-810f-c04153c831b5
120 lines
3.3 KiB
Python
120 lines
3.3 KiB
Python
#!/usr/bin/python
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# Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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# for details. All rights reserved. Use of this source code is governed by a
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# BSD-style license that can be found in the LICENSE file.
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"""Templating to help generate structured text."""
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import os
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import sys
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import subprocess
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import time
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import emitter
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import logging
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_logger = logging.getLogger('multiemitter')
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class MultiEmitter(object):
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"""A set of Emitters that write to different files.
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Each entry has a key.
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file --> emitter
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key --> emitter
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"""
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def __init__(self, logging_level=logging.WARNING):
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self._key_to_emitter = {} # key -> Emitter
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self._filename_to_emitter = {} # filename -> Emitter
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_logger.setLevel(logging_level)
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def FileEmitter(self, filename, key=None):
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"""Creates an emitter for writing to a file.
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When this MultiEmitter is flushed, the contents of the emitter are written
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to the file.
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Arguments:
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filename: a string, the path name of the file
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key: provides an access key to retrieve the emitter.
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Returns: the emitter.
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"""
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e = emitter.Emitter()
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self._filename_to_emitter[filename] = e
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if key:
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self.Associate(key, e)
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return e
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def Associate(self, key, emitter):
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"""Associates a key with an emitter."""
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self._key_to_emitter[key] = emitter
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def Find(self, key):
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"""Returns the emitter associated with |key|."""
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return self._key_to_emitter[key]
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def Flush(self, writer=None):
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"""Writes all pending files.
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Arguments:
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writer: a function called for each file and it's lines.
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"""
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if not writer:
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writer = _WriteFile
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for file in sorted(self._filename_to_emitter.keys()):
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emitter = self._filename_to_emitter[file]
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writer(file, emitter.Fragments())
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def _WriteFile(path, lines):
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(dir, file) = os.path.split(path)
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# Ensure dir exists.
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if dir:
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if not os.path.isdir(dir):
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_logger.info('Mkdir - %s' % dir)
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os.makedirs(dir)
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# If file exists and is unchanged, return.
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new_contents = ''.join(lines)
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if os.path.exists(path):
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with open(path) as fd:
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contents = fd.read()
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if new_contents == contents:
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_logger.info('Unchanged file %s' % path)
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return
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# Write the file.
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num_attempts = 4
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for i in range(num_attempts):
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try:
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_logger.info('Writing (attempt %d) - %s' % (i + 1, path))
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with open(path, 'w') as fd:
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fd.write(new_contents)
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return
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except IOError as error:
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last_attempt = (i == (num_attempts - 1))
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if not last_attempt:
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# Sleep for 50 ms and try again
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time.sleep(0.05)
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else:
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# FIXME(kustermann): Remove this later on.
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# We try to get more debugging information to figure out why we
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# sometimes get a "Permission denied" error when opening the file for
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# writing. (hypothesis: Another process has already opened the file.)
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_logger.info('Got exception (%s) ' % error)
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if sys.platform == 'win32':
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handle_file = r'E:\handle.exe'
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if os.path.exists(handle_file):
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_logger.info('Running handle.exe for debugging purposes')
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subprocess.call([handle_file, '-a', r'E:\b\build\slave'])
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else:
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_logger.info("Couldn't find %s. Not printing open handles."
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% handle_file)
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raise error
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