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419 lines (341 loc) · 11.6 KB
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from __future__ import absolute_import
import distutils.util
import atexit
import io
import os
import re
import sys
import logging
import datetime
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
ANSI_TERMS = (
'([xe]|bv)term',
'(sco)?ansi',
'cygwin',
'konsole',
'linux',
'rxvt',
'screen',
'tmux',
'vt(10[02]|220|320)',
)
ANSI_TERM_RE = re.compile('^({})'.format('|'.join(ANSI_TERMS)), re.IGNORECASE)
def is_ansi_terminal(fd, is_terminal=None): # pragma: no cover
if is_terminal is None:
# Jupyter Notebooks define this variable and support progress bars
if 'JPY_PARENT_PID' in os.environ:
is_terminal = True
# This works for newer versions of pycharm only. older versions there
# is no way to check.
elif os.environ.get('PYCHARM_HOSTED') == '1':
is_terminal = True
if is_terminal is None:
# check if we are writing to a terminal or not. typically a file object
# is going to return False if the instance has been overridden and
# isatty has not been defined we have no way of knowing so we will not
# use ansi. ansi terminals will typically define one of the 2
# environment variables.
try:
is_tty = fd.isatty()
# Try and match any of the huge amount of Linux/Unix ANSI consoles
if is_tty and ANSI_TERM_RE.match(os.environ.get('TERM', '')):
is_terminal = True
# ANSICON is a Windows ANSI compatible console
elif 'ANSICON' in os.environ:
is_terminal = True
else:
is_terminal = None
except Exception:
is_terminal = False
return is_terminal
def is_terminal(fd, is_terminal=None):
if is_terminal is None:
# Full ansi support encompasses what we expect from a terminal
is_terminal = is_ansi_terminal(True) or None
if is_terminal is None:
# Allow a environment variable override
is_terminal = env_flag('PROGRESSBAR_IS_TERMINAL', None)
if is_terminal is None: # pragma: no cover
# Bare except because a lot can go wrong on different systems. If we do
# get a TTY we know this is a valid terminal
try:
is_terminal = fd.isatty()
except Exception:
is_terminal = False
return is_terminal
def deltas_to_seconds(*deltas, **kwargs): # default=ValueError):
'''
Convert timedeltas and seconds as int to seconds as float while coalescing
>>> deltas_to_seconds(datetime.timedelta(seconds=1, milliseconds=234))
1.234
>>> deltas_to_seconds(123)
123.0
>>> deltas_to_seconds(1.234)
1.234
>>> deltas_to_seconds(None, 1.234)
1.234
>>> deltas_to_seconds(0, 1.234)
0.0
>>> deltas_to_seconds()
Traceback (most recent call last):
...
ValueError: No valid deltas passed to `deltas_to_seconds`
>>> deltas_to_seconds(None)
Traceback (most recent call last):
...
ValueError: No valid deltas passed to `deltas_to_seconds`
>>> deltas_to_seconds(default=0.0)
0.0
'''
default = kwargs.pop('default', ValueError)
assert not kwargs, 'Only the `default` keyword argument is supported'
for delta in deltas:
if delta is None:
continue
if isinstance(delta, datetime.timedelta):
return timedelta_to_seconds(delta)
elif not isinstance(delta, float):
return float(delta)
else:
return delta
if default is ValueError:
raise ValueError('No valid deltas passed to `deltas_to_seconds`')
else:
return default
def no_color(value):
'''
Return the `value` without ANSI escape codes
>>> no_color(b'\u001b[1234]abc') == b'abc'
True
>>> str(no_color(u'\u001b[1234]abc'))
'abc'
>>> str(no_color('\u001b[1234]abc'))
'abc'
'''
if isinstance(value, bytes):
pattern = '\\\u001b\\[.*?[@-~]'
pattern = pattern.encode()
replace = b''
assert isinstance(pattern, bytes)
else:
pattern = u'\x1b\\[.*?[@-~]'
replace = ''
return re.sub(pattern, replace, value)
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
'''
return len(no_color(value))
def env_flag(name, default=None):
'''
Accepts environt variables formatted as y/n, yes/no, 1/0, true/false,
on/off, and returns it as a boolean
If the environt variable is not defined, or has an unknown value, returns
`default`
'''
try:
return bool(distutils.util.strtobool(os.environ.get(name, '')))
except ValueError:
return default
class WrappingIO:
def __init__(self, target, capturing=False, listeners=set()):
self.buffer = six.StringIO()
self.target = target
self.capturing = capturing
self.listeners = listeners
self.needs_clear = False
def write(self, value):
if self.capturing:
self.buffer.write(value)
if '\n' in value: # pragma: no branch
self.needs_clear = True
for listener in self.listeners: # pragma: no branch
listener.update()
else:
self.target.write(value)
if '\n' in value: # pragma: no branch
self.flush_target()
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)
self.needs_clear = False
# when explicitly flushing, always flush the target as well
self.flush_target()
def flush_target(self): # pragma: no cover
if not self.target.closed and getattr(self.target, 'flush'):
self.target.flush()
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 env_flag('WRAP_STDOUT', default=False): # pragma: no cover
self.wrap_stdout()
if env_flag('WRAP_STDERR', default=False): # 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 needs_clear(self): # pragma: no cover
stdout_needs_clear = getattr(self.stdout, 'needs_clear', False)
stderr_needs_clear = getattr(self.stderr, 'needs_clear', False)
return stderr_needs_clear or stdout_needs_clear
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()
class AttributeDict(dict):
'''
A dict that can be accessed with .attribute
>>> attrs = AttributeDict(spam=123)
# Reading
>>> attrs['spam']
123
>>> attrs.spam
123
# Read after update using attribute
>>> attrs.spam = 456
>>> attrs['spam']
456
>>> attrs.spam
456
# Read after update using dict access
>>> attrs['spam'] = 123
>>> attrs['spam']
123
>>> attrs.spam
123
# Read after update using dict access
>>> del attrs.spam
>>> attrs['spam']
Traceback (most recent call last):
...
KeyError: 'spam'
>>> attrs.spam
Traceback (most recent call last):
...
AttributeError: No such attribute: spam
>>> del attrs.spam
Traceback (most recent call last):
...
AttributeError: No such attribute: spam
'''
def __getattr__(self, name):
if name in self:
return self[name]
else:
raise AttributeError("No such attribute: " + name)
def __setattr__(self, name, value):
self[name] = value
def __delattr__(self, name):
if name in self:
del self[name]
else:
raise AttributeError("No such attribute: " + name)
logger = logging.getLogger(__name__)
streams = StreamWrapper()
atexit.register(streams.flush)
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