Mercurial > templog
annotate py/tempserver.py @ 529:5201f441bf4a
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 10 Apr 2015 23:59:16 +0800 |
| parents | 61e61de49a50 |
| children | e39ed85d87a5 |
| rev | line source |
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| 447 | 1 #!/home/matt/templog/venv/bin/python |
| 439 | 2 |
| 3 import sys | |
| 4 import os | |
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5 import logging |
| 498 | 6 import time |
| 7 import signal | |
| 527 | 8 import asyncio |
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9 |
| 471 | 10 import lockfile.pidlockfile |
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11 import daemon |
| 439 | 12 |
| 13 import utils | |
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14 from utils import L,D,EX,W |
| 444 | 15 import fridge |
| 16 import config | |
| 17 import sensor_ds18b20 | |
| 18 import params | |
| 459 | 19 import uploader |
| 444 | 20 |
| 439 | 21 |
| 22 class Tempserver(object): | |
| 23 def __init__(self): | |
| 24 self.readings = [] | |
| 444 | 25 self.current = (None, None) |
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26 self.fridge = None |
| 527 | 27 self._wakeup = asyncio.Event() |
| 439 | 28 |
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29 def __enter__(self): |
| 444 | 30 self.params = params.Params() |
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31 self.fridge = fridge.Fridge(self) |
| 459 | 32 self.uploader = uploader.Uploader(self) |
| 444 | 33 self.params.load() |
| 528 | 34 self.set_sensors(sensor.make_sensor(self)) |
| 527 | 35 asyncio.get_event_loop().add_signal_handler(signal.SIGHUP, self._reload_signal) |
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36 return self |
| 439 | 37 |
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38 def __exit__(self, exc_type, exc_value, traceback): |
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39 L("Exiting, cleanup handler"); |
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40 self.fridge.off() |
| 439 | 41 |
| 444 | 42 def run(self): |
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43 |
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44 if self.fridge is None: |
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45 raise Exception("Tempserver.run() must be within 'with Tempserver() as server'") |
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46 |
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47 # XXX do these go here or in __enter_() ? |
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48 self.start_time = self.now() |
| 527 | 49 tasks = ( |
| 50 self.fridge.run(), | |
| 51 self.sensors.run(), | |
| 52 self.uploader.run(), | |
| 53 ) | |
| 54 loop = asyncio.get_event_loop() | |
| 55 try: | |
| 56 loop.run_until_complete(asyncio.wait(tasks)) | |
| 57 # not reached | |
| 58 except KeyboardInterrupt: | |
| 59 pass | |
| 444 | 60 |
| 61 def now(self): | |
| 62 return utils.monotonic_time() | |
| 63 | |
| 443 | 64 def set_sensors(self, sensors): |
| 447 | 65 if hasattr(self, 'sensors'): |
| 443 | 66 self.sensors.kill() |
| 67 self.sensors = sensors | |
| 68 self.wort_name = sensors.wort_name() | |
| 69 self.fridge_name = sensors.fridge_name() | |
| 439 | 70 |
| 71 def take_readings(self): | |
| 72 ret = self.readings | |
| 73 self.readings = [] | |
| 74 return ret | |
| 75 | |
| 76 def pushfront(self, readings): | |
| 77 """ used if a caller of take_readings() fails """ | |
| 459 | 78 self.readings = readings + self.readings |
| 439 | 79 |
| 443 | 80 # a reading is a map of {sensorname: value}. temperatures |
| 81 # are float degrees | |
| 439 | 82 def add_reading(self, reading): |
| 83 """ adds a reading at the current time """ | |
| 454 | 84 D("add_reading(%s)" % str(reading)) |
| 444 | 85 self.readings.append( (reading, self.now())) |
| 443 | 86 self.current = (reading.get(self.wort_name, None), |
| 87 reading.get(self.fridge_name, None)) | |
| 459 | 88 if len(self.readings) > config.MAX_READINGS: |
| 89 self.readings = self.readings[-config.MAX_READINGS:] | |
| 439 | 90 |
| 91 def current_temps(self): | |
| 443 | 92 """ returns (wort_temp, fridge_temp) tuple """ |
| 447 | 93 return self.current |
| 444 | 94 |
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95 def sleep(self, timeout): |
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96 """ sleeps for timeout seconds, though wakes if the server's config is updated """ |
| 527 | 97 asyncio.wait_for(self._wakeup, timeout=timeout) |
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98 |
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99 def _reload_signal(self): |
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100 try: |
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101 self.params.load() |
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102 L("Reloaded.") |
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103 self._wakeup.set() |
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104 self._wakeup.clear() |
| 528 | 105 except Error as e: |
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106 W("Problem reloading: %s" % str(e)) |
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107 |
| 444 | 108 def setup_logging(): |
| 109 logging.basicConfig(format='%(asctime)s %(message)s', | |
| 110 datefmt='%m/%d/%Y %I:%M:%S %p', | |
| 462 | 111 level=logging.INFO) |
| 444 | 112 |
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113 def start(): |
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114 with Tempserver() as server: |
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115 server.run() |
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116 |
| 444 | 117 def main(): |
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118 setup_logging() |
| 444 | 119 |
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120 heredir = os.path.abspath(os.path.dirname(__file__)) |
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121 pidpath = os.path.join(heredir, 'tempserver.pid') |
| 471 | 122 pidf = lockfile.pidlockfile.PIDLockFile(pidpath, threaded=False) |
| 499 | 123 do_hup = '--hup' in sys.argv |
| 471 | 124 try: |
| 514 | 125 pidf.acquire(1) |
| 471 | 126 pidf.release() |
| 528 | 127 except (lockfile.AlreadyLocked, lockfile.LockTimeout) as e: |
| 471 | 128 pid = pidf.read_pid() |
| 499 | 129 if do_hup: |
| 130 try: | |
| 131 os.kill(pid, signal.SIGHUP) | |
| 529 | 132 print("Sent SIGHUP to process %d" % pid, file=sys.stderr) |
| 499 | 133 sys.exit(0) |
| 134 except OSError: | |
| 529 | 135 print("Process %d isn't running?" % pid, file=sys.stderr) |
| 499 | 136 sys.exit(1) |
| 137 | |
| 529 | 138 print("Locked by PID %d" % pid, file=sys.stderr) |
| 499 | 139 |
| 498 | 140 stale = False |
| 471 | 141 if pid > 0: |
| 498 | 142 if '--new' in sys.argv: |
| 143 try: | |
| 144 os.kill(pid, 0) | |
| 145 except OSError: | |
| 146 stale = True | |
| 147 | |
| 148 if not stale: | |
| 529 | 149 print("Stopping old tempserver pid %d" % pid, file=sys.stderr) |
| 498 | 150 os.kill(pid, signal.SIGTERM) |
| 151 time.sleep(2) | |
| 152 pidf.acquire(0) | |
| 153 pidf.release() | |
| 154 else: | |
| 155 try: | |
| 156 os.kill(pid, 0) | |
| 157 # must still be running PID | |
| 158 raise e | |
| 159 except OSError: | |
| 160 stale = True | |
| 161 | |
| 162 if stale: | |
| 163 # isn't still running, steal the lock | |
| 529 | 164 print("Unlinking stale lockfile %s for pid %d" % (pidpath, pid), file=sys.stderr) |
| 498 | 165 pidf.break_lock() |
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166 |
| 499 | 167 if do_hup: |
| 529 | 168 print("Doesn't seem to be running", file=sys.stderr) |
| 499 | 169 sys.exit(1) |
| 170 | |
| 444 | 171 if '--daemon' in sys.argv: |
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172 logpath = os.path.join(os.path.dirname(__file__), 'tempserver.log') |
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173 logf = open(logpath, 'a+') |
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174 with daemon.DaemonContext(pidfile=pidf, stdout=logf, stderr = logf): |
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175 start() |
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176 else: |
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177 with pidf: |
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178 start() |
| 444 | 179 |
| 180 if __name__ == '__main__': | |
| 181 main() |