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utils.py
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from __future__ import absolute_import
import io
import os
import re
import sys
import logging
from python_utils.time import timedelta_to_seconds, epoch, format_time
from python_utils.converters import scale_1024
from python_utils.terminal import get_terminal_size
import six
assert timedelta_to_seconds
assert get_terminal_size
assert format_time
assert scale_1024
assert epoch
def len_color(value):
'''
Return the length of `value` without ANSI escape codes
>>> len_color(b'\u001b[1234]abc')
3
>>> len_color(u'\u001b[1234]abc')
3
>>> len_color('\u001b[1234]abc')
3
'''
if isinstance(value, bytes):
pattern = '\\\u001b\\[.*?[@-~]'
pattern = pattern.encode()
replace = b''
assert isinstance(pattern, bytes)
else:
pattern = u'\x1b\\[.*?[@-~]'
replace = ''
value = re.sub(pattern, replace, value)
return len(value)
class WrappingIO:
def __init__(self, target, capturing=False, listeners=set()):
self.buffer = six.StringIO()
self.target = target
self.capturing = capturing
self.listeners = listeners
def write(self, value):
if self.capturing:
self.buffer.write(value)
if '\n' in value:
for listener in self.listeners: # pragma: no branch
listener.update()
else:
self.target.write(value)
def flush(self):
self.buffer.flush()
def _flush(self):
value = self.buffer.getvalue()
if value:
self.flush()
self.target.write(value)
self.buffer.seek(0)
self.buffer.truncate(0)
class StreamWrapper(object):
'''Wrap stdout and stderr globally'''
def __init__(self):
self.stdout = self.original_stdout = sys.stdout
self.stderr = self.original_stderr = sys.stderr
self.original_excepthook = sys.excepthook
self.wrapped_stdout = 0
self.wrapped_stderr = 0
self.wrapped_excepthook = 0
self.capturing = 0
self.listeners = set()
if os.environ.get('WRAP_STDOUT'): # pragma: no cover
self.wrap_stdout()
if os.environ.get('WRAP_STDERR'): # pragma: no cover
self.wrap_stderr()
def start_capturing(self, bar=None):
if bar: # pragma: no branch
self.listeners.add(bar)
self.capturing += 1
self.update_capturing()
def stop_capturing(self, bar=None):
if bar: # pragma: no branch
try:
self.listeners.remove(bar)
except KeyError:
pass
self.capturing -= 1
self.update_capturing()
def update_capturing(self): # pragma: no cover
if isinstance(self.stdout, WrappingIO):
self.stdout.capturing = self.capturing > 0
if isinstance(self.stderr, WrappingIO):
self.stderr.capturing = self.capturing > 0
if self.capturing <= 0:
self.flush()
def wrap(self, stdout=False, stderr=False):
if stdout:
self.wrap_stdout()
if stderr:
self.wrap_stderr()
def wrap_stdout(self):
self.wrap_excepthook()
if not self.wrapped_stdout:
self.stdout = sys.stdout = WrappingIO(self.original_stdout,
listeners=self.listeners)
self.wrapped_stdout += 1
return sys.stdout
def wrap_stderr(self):
self.wrap_excepthook()
if not self.wrapped_stderr:
self.stderr = sys.stderr = WrappingIO(self.original_stderr,
listeners=self.listeners)
self.wrapped_stderr += 1
return sys.stderr
def unwrap_excepthook(self):
if self.wrapped_excepthook:
self.wrapped_excepthook -= 1
sys.excepthook = self.original_excepthook
def wrap_excepthook(self):
if not self.wrapped_excepthook:
logger.debug('wrapping excepthook')
self.wrapped_excepthook += 1
sys.excepthook = self.excepthook
def unwrap(self, stdout=False, stderr=False):
if stdout:
self.unwrap_stdout()
if stderr:
self.unwrap_stderr()
def unwrap_stdout(self):
if self.wrapped_stdout > 1:
self.wrapped_stdout -= 1
else:
sys.stdout = self.original_stdout
self.wrapped_stdout = 0
def unwrap_stderr(self):
if self.wrapped_stderr > 1:
self.wrapped_stderr -= 1
else:
sys.stderr = self.original_stderr
self.wrapped_stderr = 0
def flush(self):
if self.wrapped_stdout: # pragma: no branch
try:
self.stdout._flush()
except (io.UnsupportedOperation,
AttributeError): # pragma: no cover
self.wrapped_stdout = False
logger.warn('Disabling stdout redirection, %r is not seekable',
sys.stdout)
if self.wrapped_stderr: # pragma: no branch
try:
self.stderr._flush()
except (io.UnsupportedOperation,
AttributeError): # pragma: no cover
self.wrapped_stderr = False
logger.warn('Disabling stderr redirection, %r is not seekable',
sys.stderr)
def excepthook(self, exc_type, exc_value, exc_traceback):
self.original_excepthook(exc_type, exc_value, exc_traceback)
self.flush()
logger = logging.getLogger(__name__)
streams = StreamWrapper()