Mercurial > templog
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 |
| rev | line source |
|---|---|
| 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 import argparse |
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10 |
| 471 | 11 import lockfile.pidlockfile |
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12 import daemon |
| 439 | 13 |
| 14 import utils | |
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15 from utils import L,D,EX,W |
| 444 | 16 import fridge |
| 17 import config | |
| 530 | 18 import sensor |
| 444 | 19 import params |
| 459 | 20 import uploader |
| 556 | 21 import configwaiter |
| 444 | 22 |
| 439 | 23 |
| 24 class Tempserver(object): | |
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25 def __init__(self, test_mode, nowait): |
| 439 | 26 self.readings = [] |
| 444 | 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 |
| 439 | 32 |
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33 def __enter__(self): |
| 444 | 34 self.params = params.Params() |
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35 self.fridge = fridge.Fridge(self, self._nowait) |
| 459 | 36 self.uploader = uploader.Uploader(self) |
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37 self.configwaiter = configwaiter.ConfigWaiter(self) |
| 444 | 38 self.params.load() |
| 528 | 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 |
| 439 | 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() |
| 439 | 46 |
| 444 | 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() |
| 533 | 54 runloops = [ |
| 527 | 55 self.fridge.run(), |
| 56 self.sensors.run(), | |
| 57 self.uploader.run(), | |
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58 self.configwaiter.run(), |
| 533 | 59 ] |
| 531 | 60 |
| 527 | 61 loop = asyncio.get_event_loop() |
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62 try: |
| 533 | 63 loop.run_until_complete(asyncio.gather(*runloops)) |
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64 except KeyboardInterrupt: |
| 533 | 65 print('\nctrl-c') |
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66 finally: |
| 533 | 67 # loop.close() seems necessary otherwise get warnings about signal handlers |
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68 loop.close() |
| 444 | 69 |
| 70 def now(self): | |
| 71 return utils.monotonic_time() | |
| 72 | |
| 443 | 73 def set_sensors(self, sensors): |
| 447 | 74 if hasattr(self, 'sensors'): |
| 443 | 75 self.sensors.kill() |
| 76 self.sensors = sensors | |
| 77 self.wort_name = sensors.wort_name() | |
| 78 self.fridge_name = sensors.fridge_name() | |
| 439 | 79 |
| 80 def take_readings(self): | |
| 81 ret = self.readings | |
| 82 self.readings = [] | |
| 83 return ret | |
| 84 | |
| 85 def pushfront(self, readings): | |
| 86 """ used if a caller of take_readings() fails """ | |
| 459 | 87 self.readings = readings + self.readings |
| 439 | 88 |
| 443 | 89 # a reading is a map of {sensorname: value}. temperatures |
| 90 # are float degrees | |
| 439 | 91 def add_reading(self, reading): |
| 92 """ adds a reading at the current time """ | |
| 454 | 93 D("add_reading(%s)" % str(reading)) |
| 444 | 94 self.readings.append( (reading, self.now())) |
| 443 | 95 self.current = (reading.get(self.wort_name, None), |
| 96 reading.get(self.fridge_name, None)) | |
| 459 | 97 if len(self.readings) > config.MAX_READINGS: |
| 98 self.readings = self.readings[-config.MAX_READINGS:] | |
| 439 | 99 |
| 100 def current_temps(self): | |
| 443 | 101 """ returns (wort_temp, fridge_temp) tuple """ |
| 531 | 102 D("current: %s" % str(self.current)) |
| 447 | 103 return self.current |
| 444 | 104 |
| 531 | 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 """ |
| 531 | 108 # XXX fixme - we should wake on _wakeup but asyncio Condition with wait_for is a bit broken? |
| 109 # https://groups.google.com/forum/#!topic/python-tulip/eSm7rZAe9LM | |
| 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 |
| 533 | 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() |
| 528 | 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 |
| 444 | 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) |
| 444 | 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 |
| 444 | 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') |
| 556 | 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 | 153 |
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154 heredir = os.path.abspath(os.path.dirname(__file__)) |
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155 pidpath = os.path.join(heredir, 'tempserver.pid') |
| 471 | 156 pidf = lockfile.pidlockfile.PIDLockFile(pidpath, threaded=False) |
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157 |
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158 |
| 471 | 159 try: |
| 514 | 160 pidf.acquire(1) |
| 471 | 161 pidf.release() |
| 528 | 162 except (lockfile.AlreadyLocked, lockfile.LockTimeout) as e: |
| 471 | 163 pid = pidf.read_pid() |
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164 if args.hup: |
| 499 | 165 try: |
| 166 os.kill(pid, signal.SIGHUP) | |
| 529 | 167 print("Sent SIGHUP to process %d" % pid, file=sys.stderr) |
| 499 | 168 sys.exit(0) |
| 169 except OSError: | |
| 529 | 170 print("Process %d isn't running?" % pid, file=sys.stderr) |
| 499 | 171 sys.exit(1) |
| 172 | |
| 529 | 173 print("Locked by PID %d" % pid, file=sys.stderr) |
| 499 | 174 |
| 498 | 175 stale = False |
| 471 | 176 if pid > 0: |
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177 if args.new: |
| 498 | 178 try: |
| 179 os.kill(pid, 0) | |
| 180 except OSError: | |
| 181 stale = True | |
| 182 | |
| 183 if not stale: | |
| 529 | 184 print("Stopping old tempserver pid %d" % pid, file=sys.stderr) |
| 498 | 185 os.kill(pid, signal.SIGTERM) |
| 186 time.sleep(2) | |
| 187 pidf.acquire(0) | |
| 188 pidf.release() | |
| 189 else: | |
| 190 try: | |
| 191 os.kill(pid, 0) | |
| 192 # must still be running PID | |
| 193 raise e | |
| 194 except OSError: | |
| 195 stale = True | |
| 196 | |
| 197 if stale: | |
| 198 # isn't still running, steal the lock | |
| 529 | 199 print("Unlinking stale lockfile %s for pid %d" % (pidpath, pid), file=sys.stderr) |
| 498 | 200 pidf.break_lock() |
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201 |
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202 if args.hup: |
| 529 | 203 print("Doesn't seem to be running", file=sys.stderr) |
| 499 | 204 sys.exit(1) |
| 205 | |
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206 if args.daemon: |
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207 logpath = os.path.join(os.path.dirname(__file__), 'tempserver.log') |
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208 logf = open(logpath, 'a+') |
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209 with daemon.DaemonContext(pidfile=pidf, stdout=logf, stderr = logf): |
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210 start(args.test, args.nowait) |
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211 else: |
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212 with pidf: |
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213 start(args.test, args.nowait) |
| 444 | 214 |
| 215 if __name__ == '__main__': | |
| 216 main() |