annotate py/tempserver.py @ 582:cebec9b40ad2

merge
author Matt Johnston <matt@ucc.asn.au>
date Mon, 30 Nov 2015 21:45:17 +0800
parents 87d064493714
children 02aff9ff8d24
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1 #!/home/matt/templog/venv/bin/python
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2
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3 import sys
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4 import os
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5 import logging
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6 import time
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7 import signal
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8 import asyncio
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9 import argparse
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10
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11 import lockfile.pidlockfile
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12 import daemon
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13
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14 import utils
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15 from utils import L,D,EX,W
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16 import fridge
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17 import config
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18 import sensor
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19 import params
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20 import uploader
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21 import configwaiter
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22
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23
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24 class Tempserver(object):
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25 def __init__(self, test_mode, nowait):
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26 self.readings = []
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27 self.current = (None, None)
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28 self.fridge = None
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29 self._wakeup = asyncio.Event()
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30 self._test_mode = test_mode
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31 self._nowait = nowait
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32
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33 def __enter__(self):
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34 self.params = params.Params()
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35 self.fridge = fridge.Fridge(self, self._nowait)
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36 self.uploader = uploader.Uploader(self)
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37 self.configwaiter = configwaiter.ConfigWaiter(self)
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38 self.params.load()
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39 self.set_sensors(sensor.make_sensor(self))
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40 asyncio.get_event_loop().add_signal_handler(signal.SIGHUP, self.reload_signal)
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41 return self
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42
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43 def __exit__(self, exc_type, exc_value, traceback):
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44 L("Exiting, cleanup handler");
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45 self.fridge.off()
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46
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47 def run(self):
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48
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49 if self.fridge is None:
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50 raise Exception("Tempserver.run() must be within 'with Tempserver() as server'")
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51
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52 # XXX do these go here or in __enter_() ?
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53 self.start_time = self.now()
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54 runloops = [
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55 self.fridge.run(),
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56 self.sensors.run(),
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57 self.uploader.run(),
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58 self.configwaiter.run(),
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59 ]
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60
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61 loop = asyncio.get_event_loop()
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62 try:
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63 loop.run_until_complete(asyncio.gather(*runloops))
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64 except KeyboardInterrupt:
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65 print('\nctrl-c')
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66 finally:
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67 # loop.close() seems necessary otherwise get warnings about signal handlers
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68 loop.close()
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69
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70 def now(self):
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71 return utils.monotonic_time()
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72
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73 def set_sensors(self, sensors):
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74 if hasattr(self, 'sensors'):
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75 self.sensors.kill()
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76 self.sensors = sensors
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77 self.wort_name = sensors.wort_name()
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78 self.fridge_name = sensors.fridge_name()
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79
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80 def take_readings(self):
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81 ret = self.readings
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82 self.readings = []
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83 return ret
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84
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85 def pushfront(self, readings):
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86 """ used if a caller of take_readings() fails """
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87 self.readings = readings + self.readings
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88
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89 # a reading is a map of {sensorname: value}. temperatures
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90 # are float degrees
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91 def add_reading(self, reading):
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92 """ adds a reading at the current time """
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93 D("add_reading(%s)" % str(reading))
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94 self.readings.append( (reading, self.now()))
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95 self.current = (reading.get(self.wort_name, None),
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96 reading.get(self.fridge_name, None))
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97 if len(self.readings) > config.MAX_READINGS:
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98 self.readings = self.readings[-config.MAX_READINGS:]
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99
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100 def current_temps(self):
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101 """ returns (wort_temp, fridge_temp) tuple """
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102 D("current: %s" % str(self.current))
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103 return self.current
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104
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105 @asyncio.coroutine
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106 def sleep(self, timeout):
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107 """ sleeps for timeout seconds, though wakes if the server's config is updated """
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108 # XXX fixme - we should wake on _wakeup but asyncio Condition with wait_for is a bit broken?
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109 # https://groups.google.com/forum/#!topic/python-tulip/eSm7rZAe9LM
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110 # For now we just sleep, ignore the _wakeup
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111 try:
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112 yield from asyncio.wait_for(self._wakeup.wait(), timeout=timeout)
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113 except asyncio.TimeoutError:
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114 pass
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115
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116 def reload_signal(self, no_file = False):
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117 try:
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118 if not no_file:
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119 self.params.load()
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120 L("Reloaded.")
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121 self._wakeup.set()
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122 self._wakeup.clear()
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123 except Error as e:
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124 W("Problem reloading: %s" % str(e))
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125
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126 def test_mode(self):
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127 return self._test_mode
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128
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129 def setup_logging(debug = False):
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130 level = logging.INFO
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131 if debug:
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132 level = logging.DEBUG
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133 logging.basicConfig(format='%(asctime)s %(message)s',
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134 datefmt='%d/%m/%Y %I:%M:%S %p',
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135 level=level)
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136 #logging.getLogger("asyncio").setLevel(logging.DEBUG)
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137
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138 def start(test_mode, nowait):
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139 with Tempserver(test_mode, nowait) as server:
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140 server.run()
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141
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142 def main():
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143 parser = argparse.ArgumentParser()
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144 parser.add_argument('--hup', action='store_true')
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145 parser.add_argument('--new', action='store_true')
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146 parser.add_argument('-D', '--daemon', action='store_true')
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147 parser.add_argument('-d', '--debug', action='store_true')
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148 parser.add_argument('-t', '--test', action='store_true')
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149 parser.add_argument('--nowait', action='store_true')
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150 args = parser.parse_args()
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151
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152 setup_logging(args.debug)
444
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153
473
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154 heredir = os.path.abspath(os.path.dirname(__file__))
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diff changeset
155 pidpath = os.path.join(heredir, 'tempserver.pid')
471
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156 pidf = lockfile.pidlockfile.PIDLockFile(pidpath, threaded=False)
532
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157
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diff changeset
158
471
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parents: 462
diff changeset
159 try:
514
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diff changeset
160 pidf.acquire(1)
471
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161 pidf.release()
528
61e61de49a50 test sensor
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diff changeset
162 except (lockfile.AlreadyLocked, lockfile.LockTimeout) as e:
471
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163 pid = pidf.read_pid()
532
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164 if args.hup:
499
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parents: 498
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165 try:
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166 os.kill(pid, signal.SIGHUP)
529
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167 print("Sent SIGHUP to process %d" % pid, file=sys.stderr)
499
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168 sys.exit(0)
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diff changeset
169 except OSError:
529
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parents: 528
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170 print("Process %d isn't running?" % pid, file=sys.stderr)
499
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parents: 498
diff changeset
171 sys.exit(1)
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172
529
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diff changeset
173 print("Locked by PID %d" % pid, file=sys.stderr)
499
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174
498
ccc2915b2dd9 Add --new flag
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diff changeset
175 stale = False
471
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176 if pid > 0:
532
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177 if args.new:
498
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parents: 473
diff changeset
178 try:
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179 os.kill(pid, 0)
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180 except OSError:
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181 stale = True
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diff changeset
182
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diff changeset
183 if not stale:
529
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184 print("Stopping old tempserver pid %d" % pid, file=sys.stderr)
498
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185 os.kill(pid, signal.SIGTERM)
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diff changeset
186 time.sleep(2)
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187 pidf.acquire(0)
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188 pidf.release()
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parents: 473
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189 else:
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parents: 473
diff changeset
190 try:
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diff changeset
191 os.kill(pid, 0)
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diff changeset
192 # must still be running PID
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parents: 473
diff changeset
193 raise e
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diff changeset
194 except OSError:
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diff changeset
195 stale = True
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diff changeset
196
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diff changeset
197 if stale:
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diff changeset
198 # isn't still running, steal the lock
529
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diff changeset
199 print("Unlinking stale lockfile %s for pid %d" % (pidpath, pid), file=sys.stderr)
498
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parents: 473
diff changeset
200 pidf.break_lock()
461
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diff changeset
201
532
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diff changeset
202 if args.hup:
529
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diff changeset
203 print("Doesn't seem to be running", file=sys.stderr)
499
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parents: 498
diff changeset
204 sys.exit(1)
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diff changeset
205
532
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diff changeset
206 if args.daemon:
461
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parents: 459
diff changeset
207 logpath = os.path.join(os.path.dirname(__file__), 'tempserver.log')
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diff changeset
208 logf = open(logpath, 'a+')
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parents: 459
diff changeset
209 with daemon.DaemonContext(pidfile=pidf, stdout=logf, stderr = logf):
565
26f20cee71be emergency change sensor config
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parents: 556
diff changeset
210 start(args.test, args.nowait)
461
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parents: 459
diff changeset
211 else:
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parents: 459
diff changeset
212 with pidf:
565
26f20cee71be emergency change sensor config
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parents: 556
diff changeset
213 start(args.test, args.nowait)
444
c5629d79b4ac few more bits
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parents: 443
diff changeset
214
c5629d79b4ac few more bits
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parents: 443
diff changeset
215 if __name__ == '__main__':
c5629d79b4ac few more bits
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parents: 443
diff changeset
216 main()