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 def select_sensordata(initial_where, initial_sql_args):
  39     engine = open_engine(config)
  40     with engine.connect() as conn:
  41         where = [initial_where]
  42         sql_args = [initial_sql_args]
  43         begin = None
  44         end = None
  45         if 'begin' in request.args:
  46             where.append('timestamp>=%s')
  47             begin = request.args.get('begin', None, parse_datetime)
  48             sql_args.append(begin)
  49         if 'end' in request.args:
  50             where.append('timestamp<=%s')
  51             end = request.args.get('end', None, parse_datetime)
  52             sql_args.append(end)
  53         sql = 'select * from sensors where {} order by id'.format(' and '.join(where))
  54         cursor = conn.execute(sql, *sql_args)
  55         result = [dict(row) for row in cursor]
  56
  57         mode = request.args.get('mode', 'full')
  58         if mode == 'consolidated':
  59             if begin is None or end is None:
  60                 pass
  61             else:
  62                 # copied from munin/master/_bin/munin-cgi-graph.in
  63                 resolutions = dict(
  64                     day   =   300,
  65                     week  =  1800,
  66                     month =  7200,
  67                     year  = 86400,
  68                 )
  69                 duration = (end - begin).total_seconds()
  70                 day = 60 * 60 * 24
  71                 if duration < day:
  72                     resolution = resolutions['day']
  73                 elif duration < 7 * day:
  74                     resolution = resolutions['week']
  75                 elif duration < 31 * day:
  76                     resolution = resolutions['month']
  77                 else:
  78                     resolution = resolutions['year']
  79                 # TODO: filter out samples from 'result'
  80                 # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
  81
  82     return result
  83
  84
  85 @app.route('/api/<version>/sensors/')
  86 def sensors(version):
  87     """List all sensors found in the database"""
  88     engine = open_engine(config)
  89     with engine.connect() as conn:
  90         cursor = conn.execute('select distinct sensor_id, sensor_name, value_type from sensors')
  91         result = [dict(row) for row in cursor]
  92         return jsonify(result)
  93
  94
  95 @app.route('/api/<version>/sensor/id/<sensor_id>')
  96 def sensorid(version, sensor_id):
  97     """Return all data for a specific sensor
  98
  99     URL parameters:
 100     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 101     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 102     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 103     """
 104     result = select_sensordata('sensor_id=%s', sensor_id)
 105     return jsonify(result)
 106
 107
 108 @app.route('/api/<version>/sensor/type/<sensor_type>')
 109 def sensortype(version, sensor_type):
 110     """Return all data for a specific sensor type
 111
 112     URL parameters:
 113     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 114     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 115     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 116     """
 117     result = select_sensordata('value_type=%s', sensor_type)
 118     return jsonify(result)
 119
 120
 121 @app.route('/data/', defaults={'timespan': 1})
 122 @app.route("/data/<int:timespan>", methods=['GET'])
 123 def data(timespan):
 124     granularity = 5 * timespan               # (every) minute(s) per day
 125     samples = 60/granularity * 24 * timespan # per hour over whole timespan
 126     s4m   = []
 127     s4m_x = []
 128     s5m   = []
 129     s5m_x = []
 130     end   = time.time()
 131     start = end - samples * granularity * 60
 132
 133     for i in range(int(samples)):
 134         s4m.append(uniform(-10,30))
 135         s5m.append(uniform(-10,30))
 136         s4mt = uniform(start, end)
 137         s5mt = uniform(start, end)
 138         s4m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s4mt)))
 139         s5m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s5mt)))
 140
 141     data = {
 142         '0316a2193bff':   s4m,
 143         '0316a2193bff_x': s4m_x,
 144         '0316a21383ff':   s5m,
 145         '0316a21383ff_x': s5m_x,
 146         }
 147
 148     return jsonify(data)
 149
 150
 151 @app.route("/")
 152 def index():
 153     return render_template('seepark_web.html', apikey=apikey)
 154