web/seepark_web.py

   1 from random import uniform
   2 import datetime
   3 import time
   4 import configparser
   5 import os
   6 from flask import Flask, render_template, jsonify, request
   7 import flask.json
   8 from sqlalchemy import create_engine
   9
  10
  11 class JSONEncoder(flask.json.JSONEncoder):
  12     def default(self, object):
  13         if isinstance(object, datetime.datetime):
  14             return object.isoformat()
  15         return super().default(object)
  16
  17
  18 def parse_datetime(date_str):
  19     return datetime.datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S')
  20
  21
  22 app = Flask(__name__)
  23 app.json_encoder = JSONEncoder
  24 config = configparser.ConfigParser()
  25 config.read(os.environ['SEEPARKINI'])
  26 apikey = config.get('openweathermap', 'apikey')
  27
  28
  29 def open_engine(config):
  30     user = config.get('database', 'user')
  31     pwd = config.get('database', 'password')
  32     host = config.get('database', 'hostname')
  33     db = config.get('database', 'database')
  34     engine = create_engine('mysql+mysqldb://{}:{}@{}/{}'.format(user, pwd, host, db), echo=False)
  35     return engine
  36
  37
  38 @app.route('/api/<version>/sensors/')
  39 def sensors(version):
  40     """List all sensors found in the database"""
  41     engine = open_engine(config)
  42     with engine.connect() as conn:
  43         cursor = conn.execute('select distinct sensor_id, sensor_name, value_type from sensors')
  44         result = [dict(row) for row in cursor]
  45         return jsonify(result)
  46
  47
  48 @app.route('/api/<version>/sensor/<sensor_id>')
  49 def sensor(version, sensor_id):
  50     """Return all sensor data
  51
  52     URL parameters:
  53     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
  54     end=<datetime>, optional, format like "2018-05-19T21:07:53"
  55     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
  56     """
  57     engine = open_engine(config)
  58     with engine.connect() as conn:
  59         where = ['sensor_id=%s']
  60         sql_args = [sensor_id]
  61         begin = None
  62         end = None
  63         if 'begin' in request.args:
  64             where.append('timestamp>=%s')
  65             begin = request.args.get('begin', None, parse_datetime)
  66             sql_args.append(begin)
  67         if 'end' in request.args:
  68             where.append('timestamp<=%s')
  69             end = request.args.get('end', None, parse_datetime)
  70             sql_args.append(end)
  71         sql = 'select * from sensors where {} order by id'.format(' and '.join(where))
  72         cursor = conn.execute(sql, *sql_args)
  73         result = [dict(row) for row in cursor]
  74
  75         mode = request.args.get('mode', 'full')
  76         if mode == 'consolidated':
  77             if begin is None or end is None:
  78                 pass
  79             else:
  80                 # copied from munin/master/_bin/munin-cgi-graph.in
  81                 resolutions = dict(
  82                     day   =   300,
  83                     week  =  1800,
  84                     month =  7200,
  85                     year  = 86400,
  86                 )
  87                 duration = (end - begin).total_seconds()
  88                 day = 60 * 60 * 24
  89                 if duration < day:
  90                     resolution = resolutions['day']
  91                 elif duration < 7 * day:
  92                     resolution = resolutions['week']
  93                 elif duration < 31 * day:
  94                     resolution = resolutions['month']
  95                 else:
  96                     resolution = resolutions['year']
  97                 # TODO: filter out samples from 'result'
  98                 # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
  99
 100         return jsonify(result)
 101
 102
 103 @app.route('/data/', defaults={'timespan': 1})
 104 @app.route("/data/<int:timespan>", methods=['GET'])
 105 def data(timespan):
 106     granularity = 5 * timespan               # (every) minute(s) per day
 107     samples = 60/granularity * 24 * timespan # per hour over whole timespan
 108     s4m   = []
 109     s4m_x = []
 110     s5m   = []
 111     s5m_x = []
 112     end   = time.time()
 113     start = end - samples * granularity * 60
 114
 115     for i in range(int(samples)):
 116         s4m.append(uniform(-10,30))
 117         s5m.append(uniform(-10,30))
 118         s4mt = uniform(start, end)
 119         s5mt = uniform(start, end)
 120         s4m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s4mt)))
 121         s5m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s5mt)))
 122
 123     data = {
 124         '0316a2193bff':   s4m,
 125         '0316a2193bff_x': s4m_x,
 126         '0316a21383ff':   s5m,
 127         '0316a21383ff_x': s5m_x,
 128         }
 129
 130     return jsonify(data)
 131
 132
 133 @app.route("/")
 134 def index():
 135     return render_template('seepark_web.html', apikey=apikey)
 136