Mercurial > templog
annotate py/tempserver.py @ 174:c49d87bb81b9
fix to absolute path for lockfile, --daemon does chdir("/")
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 25 Jul 2013 08:03:14 +0800 |
| parents | 5821c5fab919 |
| children | be579bcf3c7f |
| rev | line source |
|---|---|
| 148 | 1 #!/home/matt/templog/venv/bin/python |
| 141 | 2 |
| 3 import sys | |
| 4 import os | |
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5 import logging |
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6 |
| 141 | 7 import gevent |
| 145 | 8 import gevent.monkey |
| 172 | 9 import lockfile.pidlockfile |
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10 import daemon |
| 141 | 11 |
| 12 import utils | |
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13 from utils import L,D,EX,W |
| 145 | 14 import fridge |
| 15 import config | |
| 16 import sensor_ds18b20 | |
| 17 import params | |
| 160 | 18 import uploader |
| 145 | 19 |
| 141 | 20 |
| 21 class Tempserver(object): | |
| 22 def __init__(self): | |
| 23 self.readings = [] | |
| 145 | 24 self.current = (None, None) |
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25 self.fridge = None |
| 145 | 26 |
| 27 # don't patch os, fork() is used by daemonize | |
| 28 gevent.monkey.patch_all(os=False, thread=False) | |
| 141 | 29 |
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30 def __enter__(self): |
| 145 | 31 self.params = params.Params() |
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32 self.fridge = fridge.Fridge(self) |
| 160 | 33 self.uploader = uploader.Uploader(self) |
| 145 | 34 self.params.load() |
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35 self.set_sensors(sensor_ds18b20.DS18B20s(self)) |
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36 return self |
| 141 | 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() |
| 141 | 41 |
| 145 | 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() |
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49 self.fridge.start() |
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50 self.sensors.start() |
| 160 | 51 self.uploader.start() |
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52 |
| 145 | 53 # won't return. |
| 54 while True: | |
| 157 | 55 try: |
| 56 gevent.sleep(60) | |
| 57 except KeyboardInterrupt: | |
| 58 break | |
| 145 | 59 |
| 60 def now(self): | |
| 61 return utils.monotonic_time() | |
| 62 | |
| 144 | 63 def set_sensors(self, sensors): |
| 148 | 64 if hasattr(self, 'sensors'): |
| 144 | 65 self.sensors.kill() |
| 66 self.sensors = sensors | |
| 67 self.wort_name = sensors.wort_name() | |
| 68 self.fridge_name = sensors.fridge_name() | |
| 141 | 69 |
| 70 def take_readings(self): | |
| 71 ret = self.readings | |
| 72 self.readings = [] | |
| 73 return ret | |
| 74 | |
| 75 def pushfront(self, readings): | |
| 76 """ used if a caller of take_readings() fails """ | |
| 160 | 77 self.readings = readings + self.readings |
| 141 | 78 |
| 144 | 79 # a reading is a map of {sensorname: value}. temperatures |
| 80 # are float degrees | |
| 141 | 81 def add_reading(self, reading): |
| 82 """ adds a reading at the current time """ | |
| 155 | 83 D("add_reading(%s)" % str(reading)) |
| 145 | 84 self.readings.append( (reading, self.now())) |
| 144 | 85 self.current = (reading.get(self.wort_name, None), |
| 86 reading.get(self.fridge_name, None)) | |
| 160 | 87 if len(self.readings) > config.MAX_READINGS: |
| 88 self.readings = self.readings[-config.MAX_READINGS:] | |
| 141 | 89 |
| 90 def current_temps(self): | |
| 144 | 91 """ returns (wort_temp, fridge_temp) tuple """ |
| 148 | 92 return self.current |
| 145 | 93 |
| 94 def setup_logging(): | |
| 95 logging.basicConfig(format='%(asctime)s %(message)s', | |
| 96 datefmt='%m/%d/%Y %I:%M:%S %p', | |
| 163 | 97 level=logging.INFO) |
| 145 | 98 |
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99 def start(): |
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100 with Tempserver() as server: |
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101 server.run() |
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102 |
| 145 | 103 def main(): |
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104 setup_logging() |
| 145 | 105 |
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fix to absolute path for lockfile, --daemon does chdir("/")
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106 heredir = os.path.abspath(os.path.dirname(__file__)) |
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107 pidpath = os.path.join(heredir, 'tempserver.pid') |
| 172 | 108 pidf = lockfile.pidlockfile.PIDLockFile(pidpath, threaded=False) |
| 109 try: | |
| 110 pidf.acquire(0) | |
| 111 pidf.release() | |
| 112 except lockfile.AlreadyLocked, e: | |
| 113 pid = pidf.read_pid() | |
| 114 print>>sys.stderr, "Locked by PID %d" % pid | |
| 115 if pid > 0: | |
| 116 try: | |
| 117 os.kill(pid, 0) | |
| 118 # must still be running PID | |
| 119 raise e | |
| 120 except OSError: | |
| 121 # isn't still running, steal the lock | |
| 122 print>>sys.stderr, "Unlinking stale lockfile %s for pid %d" % (pidpath, pid) | |
| 123 pidf.break_lock() | |
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124 |
| 145 | 125 if '--daemon' in sys.argv: |
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126 logpath = os.path.join(os.path.dirname(__file__), 'tempserver.log') |
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127 logf = open(logpath, 'a+') |
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128 with daemon.DaemonContext(pidfile=pidf, stdout=logf, stderr = logf): |
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129 start() |
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130 else: |
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131 with pidf: |
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132 start() |
| 145 | 133 |
| 134 if __name__ == '__main__': | |
| 135 main() |