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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
# ================================================================================
# Copyright (c) 2018-2019 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
#
"""periodically callback"""
import json
from datetime import datetime
from threading import Event, RLock, Thread
from .utils import Utils
_LOGGER = Utils.get_logger(__file__)
class StepTimer(Thread):
"""call on_time after interval number of seconds, then wait to continue"""
STATE_INIT = "init"
STATE_NEXT = "next"
STATE_STARTED = "started"
STATE_PAUSED = "paused"
STATE_STOPPING = "stopping"
STATE_STOPPED = "stopped"
def __init__(self, name, interval, on_time, *args, **kwargs):
"""create step timer with controlled start. next step and pause"""
Thread.__init__(self, name=name)
self._interval = interval
self._on_time = on_time
self._args = args
self._kwargs = kwargs
self._lock = RLock()
self._timeout = Event()
self._waiting_for_timeout = False
self._next = Event()
self._paused = False
self._finished = False
self._request = StepTimer.STATE_INIT
self._req_count = 0
self._req_time = 0
self._req_ts = datetime.utcnow()
self._substep = None
self._substep_time = 0
self._substep_ts = datetime.utcnow()
def get_timer_status(self):
"""returns timer status"""
with self._lock:
return "{0}[{1}] {2}: timeout({3}), paused({4}), next({5}), finished({6})".format(
self._request,
self._req_count,
self._substep,
self._timeout.is_set(),
self._paused,
self._next.is_set(),
self._finished,
)
def next(self, interval=None):
"""continue with the next timeout"""
with self._lock:
if interval:
self._interval = interval
self._paused = False
if self._waiting_for_timeout:
self._next.set()
self._timeout.set()
else:
self._next.set()
self._request_to_timer(StepTimer.STATE_NEXT)
def pause(self):
"""pause the timer"""
with self._lock:
self._paused = True
self._next.clear()
self._request_to_timer(StepTimer.STATE_PAUSED)
def stop(self):
"""stop the timer if it hasn't finished yet"""
with self._lock:
self._finished = True
self._timeout.set()
self._next.set()
self._request_to_timer(StepTimer.STATE_STOPPING)
def _request_to_timer(self, request):
"""set the request on the timer"""
with self._lock:
if request in [StepTimer.STATE_NEXT, StepTimer.STATE_STARTED]:
self._req_count += 1
prev_req = self._request
self._request = request
utcnow = datetime.utcnow()
self._req_time = (utcnow - self._req_ts).total_seconds()
self._req_ts = utcnow
_LOGGER.info("{}[{}] {}->{}".format(self.name, self._req_time, prev_req,
self.get_timer_status()))
def _log_substep(self, substep):
"""log timer substep"""
with self._lock:
self._substep = substep
utcnow = datetime.utcnow()
self._substep_time = (utcnow - self._substep_ts).total_seconds()
self._substep_ts = utcnow
_LOGGER.info("{}[{}] {}".format(self.name, self._substep_time,
self.get_timer_status()))
def _on_time_event(self):
"""execute the _on_time event"""
if self._paused:
self._log_substep("paused - skip on_time event")
return
try:
self._log_substep("on_time event")
self._on_time(*self._args, **self._kwargs)
except Exception as ex:
error_msg = ("{0}: crash {1} {2} at {3}: args({4}), kwargs({5})"
.format(self.name, type(ex).__name__, str(ex), "_on_time",
json.dumps(self._args), json.dumps(self._kwargs)))
_LOGGER.exception(error_msg)
def run(self):
"""loop one step a time until stopped=finished"""
self._request_to_timer(StepTimer.STATE_STARTED)
while True:
with self._lock:
self._timeout.clear()
self._waiting_for_timeout = True
self._log_substep("waiting for timeout {0}...".format(self._interval))
interrupted = self._timeout.wait(self._interval)
with self._lock:
self._waiting_for_timeout = False
self._log_substep("woke up after {0}timeout"
.format((interrupted and "interrupted ") or ""))
if self._finished:
self._log_substep("finished")
break
if self._next.is_set() and interrupted:
self._next.clear()
self._log_substep("restart timer")
continue
self._on_time_event()
self._log_substep("waiting for next...")
self._next.wait()
with self._lock:
self._next.clear()
self._log_substep("woke up on next")
if self._finished:
self._log_substep("finished")
break
self._request_to_timer(StepTimer.STATE_STOPPED)
|
