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comparison weatherlog/daemon.py @ 12:91e22a09b82f

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Create 'daemon.py', a runner to tie it all together.
author Paul Fisher <paul@pfish.zone>
date Sun, 29 Sep 2019 11:53:35 -0400
parents
children 4c81182eaa6b
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11:6dbd9825b3f5 12:91e22a09b82f
1 """Entry point to set up a temperature logging daemon."""
2
3 import time
4 import typing as t
5
6 from . import http_writer
7 from . import logger
8 from . import reader
9
10 DEFAULT_INTERVAL_SECS = 60
11 MIN_INTERVAL_SECS = 5
12
13
14 def run(
15 directory: str,
16 url: str,
17 preamble: t.Dict[str, t.Any],
18 interval: int = DEFAULT_INTERVAL_SECS,
19 ):
20 """Sets up and runs a logger daemon."""
21 writer = http_writer.HTTPWriter(url, preamble)
22 log = logger.BufferedLogger(directory, writer)
23 log.start()
24
25 r = reader.DHT22Reader()
26 cycle = 0
27 start = time.time()
28 while True:
29 log.write(r.read())
30 cycle += 1
31 target = start + interval * cycle
32 now = time.time()
33 time.sleep(max(target - now, MIN_INTERVAL_SECS))