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136 lines
5.0 KiB
Python
136 lines
5.0 KiB
Python
# Copyright (C) 2010, 2012 Google Inc. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import logging
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import os
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import sys
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import time
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LOG_HANDLER_NAME = 'MeteredStreamLogHandler'
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class MeteredStream(object):
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"""
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This class implements a stream wrapper that has 'meters' as well as
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regular output. A 'meter' is a single line of text that can be erased
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and rewritten repeatedly, without producing multiple lines of output. It
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can be used to produce effects like progress bars.
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"""
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@staticmethod
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def _erasure(txt):
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num_chars = len(txt)
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return '\b' * num_chars + ' ' * num_chars + '\b' * num_chars
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@staticmethod
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def _ensure_newline(txt):
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return txt if txt.endswith('\n') else txt + '\n'
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def __init__(self, stream=None, verbose=False, logger=None, time_fn=None, pid=None, number_of_columns=None):
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self._stream = stream or sys.stderr
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self._verbose = verbose
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self._time_fn = time_fn or time.time
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self._pid = pid or os.getpid()
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self._isatty = self._stream.isatty()
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self._erasing = self._isatty and not verbose
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self._last_partial_line = ''
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self._last_write_time = 0.0
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self._throttle_delay_in_secs = 0.066 if self._erasing else 10.0
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self._number_of_columns = sys.maxint
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if self._isatty and number_of_columns:
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self._number_of_columns = number_of_columns
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self._logger = logger
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self._log_handler = None
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if self._logger:
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log_level = logging.DEBUG if verbose else logging.INFO
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self._log_handler = _LogHandler(self)
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self._log_handler.setLevel(log_level)
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self._logger.addHandler(self._log_handler)
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def __del__(self):
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self.cleanup()
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def cleanup(self):
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if self._logger:
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self._logger.removeHandler(self._log_handler)
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self._log_handler = None
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def write_throttled_update(self, txt):
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now = self._time_fn()
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if now - self._last_write_time >= self._throttle_delay_in_secs:
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self.write_update(txt, now)
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def write_update(self, txt, now=None):
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self.write(txt, now)
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if self._erasing:
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self._last_partial_line = txt[txt.rfind('\n') + 1:]
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def write(self, txt, now=None, pid=None):
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now = now or self._time_fn()
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pid = pid or self._pid
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self._last_write_time = now
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if self._last_partial_line:
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self._erase_last_partial_line()
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if self._verbose:
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now_tuple = time.localtime(now)
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msg = '%02d:%02d:%02d.%03d %d %s' % (now_tuple.tm_hour, now_tuple.tm_min, now_tuple.tm_sec, int((now * 1000) % 1000), pid, self._ensure_newline(txt))
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elif self._isatty:
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msg = txt
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else:
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msg = self._ensure_newline(txt)
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self._stream.write(msg)
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def writeln(self, txt, now=None, pid=None):
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self.write(self._ensure_newline(txt), now, pid)
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def _erase_last_partial_line(self):
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num_chars = len(self._last_partial_line)
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self._stream.write(self._erasure(self._last_partial_line))
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self._last_partial_line = ''
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def flush(self):
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if self._last_partial_line:
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self._stream.write('\n')
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self._last_partial_line = ''
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self._stream.flush()
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def number_of_columns(self):
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return self._number_of_columns
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class _LogHandler(logging.Handler):
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def __init__(self, meter):
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logging.Handler.__init__(self)
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self._meter = meter
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self.name = LOG_HANDLER_NAME
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def emit(self, record):
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self._meter.writeln(record.getMessage(), record.created, record.process)
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