annotate py/tempserver.py @ 219:16a83e2c97a0

sleep on a semaphore so it can start/stop immediately when there's a SIGHUP from the web UI. makes it seem more magical.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 19 Dec 2014 21:52:50 +0800
parents 5eb7e2400c18
children d9e81a563923
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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9 import gevent
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10 import gevent.monkey
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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_ds18b20
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19 import params
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20 import uploader
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21
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22
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23 class Tempserver(object):
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24 def __init__(self):
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25 self.readings = []
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26 self.current = (None, None)
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27 self.fridge = None
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28 self._wakeup = gevent.event.Event()
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29
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30 # don't patch os, fork() is used by daemonize
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31 gevent.monkey.patch_all(os=False, thread=False)
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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)
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36 self.uploader = uploader.Uploader(self)
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37 self.params.load()
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38 self.set_sensors(sensor_ds18b20.DS18B20s(self))
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39 gevent.signal(signal.SIGHUP, self._reload_signal)
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40 return self
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41
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42 def __exit__(self, exc_type, exc_value, traceback):
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43 L("Exiting, cleanup handler");
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44 self.fridge.off()
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45
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46 def run(self):
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47
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48 if self.fridge is None:
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49 raise Exception("Tempserver.run() must be within 'with Tempserver() as server'")
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50
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51 # XXX do these go here or in __enter_() ?
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52 self.start_time = self.now()
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53 self.fridge.start()
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54 self.sensors.start()
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55 self.uploader.start()
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56
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57 # won't return.
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58 while True:
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59 try:
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60 gevent.sleep(60)
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61 except KeyboardInterrupt:
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62 break
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63
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64 def now(self):
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65 return utils.monotonic_time()
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66
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67 def set_sensors(self, sensors):
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68 if hasattr(self, 'sensors'):
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69 self.sensors.kill()
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70 self.sensors = sensors
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71 self.wort_name = sensors.wort_name()
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72 self.fridge_name = sensors.fridge_name()
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73
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74 def take_readings(self):
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75 ret = self.readings
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76 self.readings = []
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77 return ret
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78
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79 def pushfront(self, readings):
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80 """ used if a caller of take_readings() fails """
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81 self.readings = readings + self.readings
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82
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83 # a reading is a map of {sensorname: value}. temperatures
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84 # are float degrees
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85 def add_reading(self, reading):
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86 """ adds a reading at the current time """
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87 D("add_reading(%s)" % str(reading))
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88 self.readings.append( (reading, self.now()))
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89 self.current = (reading.get(self.wort_name, None),
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90 reading.get(self.fridge_name, None))
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91 if len(self.readings) > config.MAX_READINGS:
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92 self.readings = self.readings[-config.MAX_READINGS:]
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93
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94 def current_temps(self):
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95 """ returns (wort_temp, fridge_temp) tuple """
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96 return self.current
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97
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98 def sleep(self, timeout):
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99 """ sleeps for timeout seconds, though wakes if the server's config is updated """
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100 self._wakeup.wait(timeout)
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101
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102 def _reload_signal(self):
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103 try:
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104 self.params.load()
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105 L("Reloaded.")
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106 self._wakeup.set()
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107 self._wakeup.clear()
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108 except self.Error, e:
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109 W("Problem reloading: %s" % str(e))
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110
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111 def setup_logging():
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112 logging.basicConfig(format='%(asctime)s %(message)s',
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113 datefmt='%m/%d/%Y %I:%M:%S %p',
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114 level=logging.INFO)
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115
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116 def start():
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117 with Tempserver() as server:
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118 server.run()
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119
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120 def main():
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121 setup_logging()
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122
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123 heredir = os.path.abspath(os.path.dirname(__file__))
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124 pidpath = os.path.join(heredir, 'tempserver.pid')
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125 pidf = lockfile.pidlockfile.PIDLockFile(pidpath, threaded=False)
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126 do_hup = '--hup' in sys.argv
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127 try:
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128 pidf.acquire(1)
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129 pidf.release()
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130 except (lockfile.AlreadyLocked, lockfile.LockTimeout), e:
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131 pid = pidf.read_pid()
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132 if do_hup:
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133 try:
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134 os.kill(pid, signal.SIGHUP)
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135 print>>sys.stderr, "Sent SIGHUP to process %d" % pid
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136 sys.exit(0)
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137 except OSError:
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138 print>>sys.stderr, "Process %d isn't running?" % pid
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139 sys.exit(1)
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140
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141 print>>sys.stderr, "Locked by PID %d" % pid
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142
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143 stale = False
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144 if pid > 0:
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145 if '--new' in sys.argv:
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146 try:
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147 os.kill(pid, 0)
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148 except OSError:
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149 stale = True
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150
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151 if not stale:
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152 print>>sys.stderr, "Stopping old tempserver pid %d" % pid
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153 os.kill(pid, signal.SIGTERM)
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154 time.sleep(2)
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155 pidf.acquire(0)
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156 pidf.release()
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157 else:
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158 try:
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159 os.kill(pid, 0)
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160 # must still be running PID
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161 raise e
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162 except OSError:
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163 stale = True
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164
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165 if stale:
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166 # isn't still running, steal the lock
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167 print>>sys.stderr, "Unlinking stale lockfile %s for pid %d" % (pidpath, pid)
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168 pidf.break_lock()
162
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169
199
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170 if do_hup:
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171 print>>sys.stderr, "Doesn't seem to be running"
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172 sys.exit(1)
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173
145
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174 if '--daemon' in sys.argv:
162
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175 logpath = os.path.join(os.path.dirname(__file__), 'tempserver.log')
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176 logf = open(logpath, 'a+')
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177 with daemon.DaemonContext(pidfile=pidf, stdout=logf, stderr = logf):
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178 start()
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179 else:
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180 with pidf:
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181 start()
145
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182
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183 if __name__ == '__main__':
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184 main()