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util.py
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util.py
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import logging
import os
import subprocess
import sys
import time
from collections import (
Iterable,
OrderedDict,
)
from difflib import (
Match,
SequenceMatcher,
)
from itertools import (
chain,
izip,
)
from types import StringType
from weakref import WeakKeyDictionary
class StreamHandler(logging.StreamHandler):
def __init__(self):
super(StreamHandler, self).__init__()
self._start_time = time.time()
def emit(self, record):
record.timestamp = record.created - self._start_time
super(StreamHandler, self).emit(record)
class Formatter(logging.Formatter):
def __init__(self):
super(Formatter, self).__init__(
'\r%(timestamp).3f %(levelname)s [%(name)s] %(message)s')
self._root_formatter = logging.Formatter('\r%(levelname)s %(message)s')
def format(self, record):
if record.name == 'root':
return self._root_formatter.format(record)
return super(Formatter, self).format(record)
logger = logging.getLogger()
handler = StreamHandler()
handler.setFormatter(Formatter())
logger.addHandler(handler)
def init_logging():
# Initialize logging from the GIT_CINNABAR_LOG environment variable
# or the cinnabar.log configuration, the former taking precedence.
# Still read the configuration to force the git config cache being
# filled before logging is setup, so that the output of
# `git config -l` is never logged.
from .git import Git
log_conf = Git.config('cinnabar.log')
if not log_conf:
return
for assignment in log_conf.split(','):
try:
name, value = assignment.split(':', 1)
value = int(value)
if name == '*':
name = ''
logging.getLogger(name).setLevel(
max(logging.DEBUG, logging.FATAL - value * 10))
except:
pass
class ConfigSetFunc(object):
def __init__(self, key, values, extra_values=()):
self._config = None
self._key = key
self._values = values
self._extra_values = extra_values
def __call__(self, name):
if self._config is None:
from .git import Git
config = Git.config(self._key) or ''
if config:
config = config.split(',')
self._config = set()
for c in config:
if c in ('true', 'all'):
self._config |= set(self._values)
elif c.startswith('-'):
c = c[1:]
try:
self._config.remove(c)
except KeyError:
logging.getLogger('config').warn(
'%s: %s is not one of (%s)',
self._key, c, ', '.join(self._config))
elif c in self._values or c in self._extra_values:
self._config.add(c)
else:
logging.getLogger('config').warn(
'%s: %s is not one of (%s)',
self._key, c, ', '.join(self._values))
return name in self._config
check_enabled = ConfigSetFunc(
'cinnabar.check',
('nodeid', 'manifests', 'helper'),
('bundle', 'files'),
)
experiment = ConfigSetFunc(
'cinnabar.experiments',
('wire', 'merge'),
)
progress = True
def progress_iter(fmt, iter, filter_func=None):
if not filter_func:
return progress_enum(fmt, enumerate(iter, start=1))
def _progress_iter():
count = 0
for item in iter:
if filter_func(item):
count += 1
yield count, item
return progress_enum(fmt, _progress_iter())
def progress_enum(fmt, enum_iter):
count = 0
t0 = 0
try:
for count, item in enum_iter:
if progress:
t1 = time.time()
if t1 - t0 > 0.1:
sys.stderr.write(('\r' + fmt) % count)
sys.stderr.flush()
t0 = t1
yield item
finally:
if progress and count:
sys.stderr.write(('\r' + fmt + '\n') % count)
sys.stderr.flush()
class IOLogger(object):
def __init__(self, logger, reader, writer=None, prefix=''):
self._reader = reader
self._writer = writer or reader
self._logger = logger
self._prefix = (prefix + ' ') if prefix else ''
def read(self, length=0, level=logging.INFO):
ret = self._reader.read(length)
if not isinstance(self._reader, IOLogger):
self._logger.log(level, '%s<= %r', self._prefix, ret)
return ret
def readline(self, level=logging.INFO):
ret = self._reader.readline()
if not isinstance(self._reader, IOLogger):
self._logger.log(level, '%s<= %r', self._prefix, ret)
return ret
def write(self, data, level=logging.INFO):
if not isinstance(self._writer, IOLogger):
self._logger.log(level, '%s=> %r', self._prefix, data)
return self._writer.write(data)
def flush(self):
self._writer.flush()
def __iter__(self):
while self._reader:
l = self.readline()
if not l:
break
yield l
def one(l):
l = list(l)
if l:
assert len(l) == 1
return l[0]
return None
class OrderedDefaultDict(OrderedDict):
def __init__(self, default_factory, *args, **kwargs):
OrderedDict.__init__(self, *args, **kwargs)
self._default_factory = default_factory
def __missing__(self, key):
value = self[key] = self._default_factory()
return value
class VersionedDict(object):
def __init__(self, content=None, **kwargs):
if content:
if kwargs:
self._previous = VersionedDict(content)
for k, v in kwargs.iteritems():
self._previous[k] = v
elif isinstance(content, (VersionedDict, dict)):
self._previous = content
else:
self._previous = dict(content)
else:
self._previous = dict(**kwargs)
self._dict = {}
self._deleted = set()
def update(self, content=None, **kwargs):
if content:
if isinstance(content, (VersionedDict, dict)):
content = content.iteritems()
for k, v in content:
self[k] = v
for k, v in kwargs.iteritems():
self[k] = v
def __getitem__(self, key):
if key in self._dict:
return self._dict[key]
return self._previous[key]
def get(self, key, default=None):
try:
return self[key]
except KeyError:
return default
def __contains__(self, key):
if key in self._deleted:
return False
if key in self._dict:
return True
return key in self._previous
def __delitem__(self, key):
self._deleted.add(key)
if key in self._dict:
del self._dict[key]
elif key not in self._previous:
raise KeyError(key)
def __setitem__(self, key, value):
if key in self._deleted:
self._deleted.remove(key)
self._dict[key] = value
def __len__(self):
return len(self._dict) + sum(1 for k in self._previous
if k not in self._deleted and
k not in self._dict)
def keys(self):
if self._previous:
return list(self)
return self._dict.keys()
def values(self):
if self._previous:
return list(chain(
self._dict.values(),
(v for k, v in self._previous.iteritems()
if k not in self._deleted and k not in self._dict)))
return self._dict.values()
def __iter__(self):
if self._previous:
return chain(self._dict,
(k for k in self._previous
if k not in self._deleted and k not in self._dict))
return iter(self._dict)
def iteritems(self):
if self._previous:
return chain(
self._dict.iteritems(),
((k, v) for k, v in self._previous.iteritems()
if k not in self._deleted and k not in self._dict))
return self._dict.iteritems()
CREATED = 1
MODIFIED = 2
REMOVED = 3
def iterchanges(self):
for k, v in self._dict.iteritems():
if k in self._previous:
if self._previous[k] == v:
continue
status = self.MODIFIED
else:
status = self.CREATED
yield status, k, v
for k in self._deleted:
if k in self._previous:
yield self.REMOVED, k, self._previous[k]
def flattened(self):
previous = self
changes = []
while isinstance(previous, VersionedDict):
changes.append(previous.iterchanges())
previous = previous._previous
ret = VersionedDict(previous)
# This can probably be optimized, but it shouldn't matter much that
# it's not.
for c in reversed(changes):
for status, k, v in c:
if status == self.REMOVED:
del ret[k]
else:
ret[k] = v
return ret
def _iter_diff_blocks(a, b):
m = SequenceMatcher(a=a, b=b, autojunk=False).get_matching_blocks()
for start, end in izip(chain((Match(0, 0, 0),), m), m):
if start.a + start.size != end.a or start.b + start.size != end.b:
yield start.a + start.size, end.a, start.b + start.size, end.b
def byte_diff(a, b):
'''Given two strings, returns the diff between them, at the byte level.
Yields start offset in a, end offset in a and replacement string for
each difference. Far from optimal results, but works well enough.'''
a = tuple(a.splitlines(True))
b = tuple(b.splitlines(True))
offset = 0
last = 0
for start_a, end_a, start_b, end_b in _iter_diff_blocks(a, b):
a2 = ''.join(a[start_a:end_a])
b2 = ''.join(b[start_b:end_b])
offset += sum(len(i) for i in a[last:start_a])
last = start_a
for start2_a, end2_a, start2_b, end2_b in _iter_diff_blocks(a2, b2):
yield offset + start2_a, offset + end2_a, b2[start2_b:end2_b]
def sorted_merge(iter_a, iter_b, key=lambda i: i[0], non_key=lambda i: i[1:]):
iter_a = iter(iter_a)
iter_b = iter(iter_b)
item_a = next(iter_a, None)
item_b = next(iter_b, None)
while item_a is not None or item_b is not None:
while item_a and (item_b and key(item_a) < key(item_b) or
item_b is None):
yield key(item_a), non_key(item_a), ()
item_a = next(iter_a, None)
while item_b and (item_a and key(item_b) < key(item_a) or
item_a is None):
yield key(item_b), (), non_key(item_b)
item_b = next(iter_b, None)
if item_a is None or item_b is None:
continue
key_a = key(item_a)
if key_a == key(item_b):
yield key_a, non_key(item_a), non_key(item_b)
item_a = next(iter_a, None)
item_b = next(iter_b, None)
class Process(object):
KWARGS = set(['stdin', 'stdout', 'stderr', 'env', 'logger'])
def __init__(self, *args, **kwargs):
assert not kwargs or not set(kwargs.keys()) - self.KWARGS
stdin = kwargs.get('stdin', None)
stdout = kwargs.get('stdout', subprocess.PIPE)
stderr = kwargs.get('stderr', None)
logger = kwargs.get('logger', args[0])
env = kwargs.get('env', {})
if isinstance(stdin, (StringType, Iterable)):
proc_stdin = subprocess.PIPE
else:
proc_stdin = stdin
full_env = VersionedDict(os.environ)
if env:
full_env.update(env)
self._proc = self._popen(args, stdin=proc_stdin, stdout=stdout,
stderr=stderr, env=full_env)
logger = logging.getLogger(logger)
if logger.isEnabledFor(logging.INFO):
self._stdin = IOLogger(logger, self._proc.stdout, self._proc.stdin,
prefix='[%d]' % self.pid)
else:
self._stdin = self._proc.stdin
if logger.isEnabledFor(logging.DEBUG):
self._stdout = self._stdin
else:
self._stdout = self._proc.stdout
if proc_stdin == subprocess.PIPE:
if isinstance(stdin, StringType):
self._stdin.write(stdin)
elif isinstance(stdin, Iterable):
for line in stdin:
self._stdin.write('%s\n' % line)
if proc_stdin != stdin:
self._proc.stdin.close()
def _env_strings(self, env):
for k, v in sorted((k, v) for s, k, v in env.iterchanges()
if s != env.REMOVED):
yield '%s=%s' % (k, v)
def _popen(self, cmd, env, **kwargs):
assert isinstance(env, VersionedDict)
proc = subprocess.Popen(cmd, env=env, **kwargs)
logger = logging.getLogger('process')
if logger.isEnabledFor(logging.INFO):
logger.info('[%d] %s', proc.pid,
' '.join(chain(self._env_strings(env), cmd)))
return proc
def wait(self):
for fh in (self._proc.stdin, self._proc.stdout, self._proc.stderr):
if fh:
fh.close()
return self._proc.wait()
@property
def pid(self):
return self._proc.pid
@property
def stdin(self):
return self._stdin
@property
def stdout(self):
return self._stdout
@property
def stderr(self):
return self._proc.stderr
class TypedProperty(object):
def __init__(self, cls):
self.cls = cls
self.values = WeakKeyDictionary()
def __get__(self, obj, cls=None):
return self.values.get(obj)
def __set__(self, obj, value):
# If the class has a "from_obj" static or class method, use it.
# Otherwise, just use cls(value)
self.values[obj] = getattr(self.cls, 'from_obj', self.cls)(value)
def run(func):
init_logging()
sys.exit(func(sys.argv[1:]))