Mercurial > personal > weather-server

annotate weather_server/server.py @ 24:20c8ec56e447

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logfile: Pull logfile thread out of Logger. This enables automatic garbage collection of Logger instances, since a running thread no longer has a reference to a Logger's self. It separates exclusive management of logfile state into the _writer_thread function, which now opens the file and writes it until it is told to stop by receiving the poison pill.
author Paul Fisher <paul@pfish.zone>
date Sun, 10 Nov 2019 23:07:11 -0500
parents 88249e451566
children 7def5611895b
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1 import datetime
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2 import hmac
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3 import pathlib
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4 import sys
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6 import bson
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7 import flask
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8 import pytz
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9
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10 from . import common
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11 from . import locations
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13
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14 def build_app(root_directory: str) -> flask.Flask:
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15 locs = locations.LocationFolder(pathlib.Path(root_directory))
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16 app = flask.Flask(__name__)
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17 app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
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19 @app.route('/favicon.ico')
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20 def favicon():
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21 return flask.send_file('static/favicon.ico')
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22
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23 @app.route('/')
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24 def home():
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25 return 'Weather server'
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26
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27 @app.route('/_submit', methods=['POST'])
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28 def submit():
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29 req = flask.request
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30 reader = bson.decode_file_iter(
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31 req.stream, codec_options=common.BSON_OPTIONS)
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32 try:
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33 preamble = next(reader)
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34 loc_name = preamble['location']
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35 password = str(preamble['password'])
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36 loc = locs.get(loc_name)
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37 if not hmac.compare_digest(password, loc.password):
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38 flask.abort(400)
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39 entries = tuple(reader)
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40 except (KeyError, bson.InvalidBSON):
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41 flask.abort(400)
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42 now = datetime.datetime.now(tz=pytz.UTC)
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43 loc.record(entries, now)
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44 return flask.jsonify({'status': 'OK'})
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45
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46 @app.route('/<location>')
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47 def show(location: str):
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48 try:
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49 loc = locs.get(location)
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50 except KeyError:
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51 flask.abort(404)
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52 last_reading = loc.latest()
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53 if last_reading:
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54 tz = loc.timezone()
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55 date = tz.normalize(last_reading.sample_time.astimezone(tz))
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56 else:
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57 date = None
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58 now = datetime.datetime.now(tz=pytz.UTC)
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59 diff = (now - date) if date else None
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60 is_recent = diff and diff < datetime.timedelta(hours=12)
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61 return flask.render_template(
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62 'location.html',
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63 location=loc,
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64 last_reading=last_reading,
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65 date=date,
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66 date_format=f'%H:%M' if is_recent else '%Y-%m-%d %H:%M')
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67
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68 @app.route('/<location>/recent')
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69 def recent(location: str):
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70 try:
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71 loc = locs.get(location)
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72 except KeyError:
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73 flask.abort(404)
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74 req = flask.request
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75
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76 try:
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77 seconds = int(req.args['seconds'])
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78 except (KeyError, ValueError):
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79 flask.abort(400)
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80
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81 start = common.utc_now() - datetime.timedelta(seconds=seconds)
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82
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83 readings = [r for r in loc.entries if start < r['sample_time']]
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84 resp = flask.Response()
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85 resp.content_type = 'application/json'
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86 resp.data = common.json_dumps({
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87 'timezone': loc.tz_name,
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88 'readings': readings,
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89 })
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90 return resp
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91
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92 return app
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95 def main(argv):
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96 """Main function for a simple local demo."""
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97 app = build_app(argv[0])
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98 app.run(host='0.0.0.0')
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99
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100
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101 if __name__ == '__main__':
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102 main(sys.argv[1:])