1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import re
from itertools import islice
import attr
from twisted.internet import defer, task
from synapse.util.logcontext import PreserveLoggingContext
logger = logging.getLogger(__name__)
def unwrapFirstError(failure):
# defer.gatherResults and DeferredLists wrap failures.
failure.trap(defer.FirstError)
return failure.value.subFailure
@attr.s
class Clock(object):
"""
A Clock wraps a Twisted reactor and provides utilities on top of it.
Args:
reactor: The Twisted reactor to use.
"""
_reactor = attr.ib()
@defer.inlineCallbacks
def sleep(self, seconds):
d = defer.Deferred()
with PreserveLoggingContext():
self._reactor.callLater(seconds, d.callback, seconds)
res = yield d
defer.returnValue(res)
def time(self):
"""Returns the current system time in seconds since epoch."""
return self._reactor.seconds()
def time_msec(self):
"""Returns the current system time in miliseconds since epoch."""
return int(self.time() * 1000)
def looping_call(self, f, msec):
"""Call a function repeatedly.
Waits `msec` initially before calling `f` for the first time.
Args:
f(function): The function to call repeatedly.
msec(float): How long to wait between calls in milliseconds.
"""
call = task.LoopingCall(f)
call.clock = self._reactor
d = call.start(msec / 1000.0, now=False)
d.addErrback(log_failure, "Looping call died", consumeErrors=False)
return call
def call_later(self, delay, callback, *args, **kwargs):
"""Call something later
Args:
delay(float): How long to wait in seconds.
callback(function): Function to call
*args: Postional arguments to pass to function.
**kwargs: Key arguments to pass to function.
"""
def wrapped_callback(*args, **kwargs):
with PreserveLoggingContext():
callback(*args, **kwargs)
with PreserveLoggingContext():
return self._reactor.callLater(delay, wrapped_callback, *args, **kwargs)
def cancel_call_later(self, timer, ignore_errs=False):
try:
timer.cancel()
except Exception:
if not ignore_errs:
raise
def batch_iter(iterable, size):
"""batch an iterable up into tuples with a maximum size
Args:
iterable (iterable): the iterable to slice
size (int): the maximum batch size
Returns:
an iterator over the chunks
"""
# make sure we can deal with iterables like lists too
sourceiter = iter(iterable)
# call islice until it returns an empty tuple
return iter(lambda: tuple(islice(sourceiter, size)), ())
def log_failure(failure, msg, consumeErrors=True):
"""Creates a function suitable for passing to `Deferred.addErrback` that
logs any failures that occur.
Args:
msg (str): Message to log
consumeErrors (bool): If true consumes the failure, otherwise passes
on down the callback chain
Returns:
func(Failure)
"""
logger.error(
msg, exc_info=(failure.type, failure.value, failure.getTracebackObject())
)
if not consumeErrors:
return failure
def glob_to_regex(glob):
"""Converts a glob to a compiled regex object.
The regex is anchored at the beginning and end of the string.
Args:
glob (str)
Returns:
re.RegexObject
"""
res = ""
for c in glob:
if c == "*":
res = res + ".*"
elif c == "?":
res = res + "."
else:
res = res + re.escape(c)
# \A anchors at start of string, \Z at end of string
return re.compile(r"\A" + res + r"\Z", re.IGNORECASE)
|
