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     format = request.args.get('format', 'default')
  83     if format == 'c3':
  84         c3result = dict()
  85         for row in result:
  86             if not row['sensor_id'] in c3result:
  87                 c3result[row['sensor_id']] = list()
  88             c3result[row['sensor_id']].append(row['value'])
  89             if not row['sensor_id'] + '_x' in c3result:
  90                 c3result[row['sensor_id'] + '_x'] = list()
  91             dt = row['timestamp'].strftime('%Y-%m-%d %H:%M:%S')
  92             c3result[row['sensor_id'] + '_x'].append(dt)
  93         result = c3result
  94     return result
  95
  96
  97 @app.route('/api/<version>/sensors/')
  98 def sensors(version):
  99     """List all sensors found in the database"""
 100     engine = open_engine(config)
 101     with engine.connect() as conn:
 102         cursor = conn.execute('select distinct sensor_id, sensor_name, value_type from sensors')
 103         result = [dict(row) for row in cursor]
 104         return jsonify(result)
 105
 106
 107 @app.route('/api/<version>/sensor/id/<sensor_id>')
 108 def sensorid(version, sensor_id):
 109     """Return all data for a specific sensor
 110
 111     URL parameters:
 112     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 113     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 114     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 115     format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js
 116     """
 117     result = select_sensordata('sensor_id=%s', sensor_id)
 118     return jsonify(result)
 119
 120
 121 @app.route('/api/<version>/sensor/type/<sensor_type>')
 122 def sensortype(version, sensor_type):
 123     """Return all data for a specific sensor type
 124
 125     URL parameters:
 126     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 127     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 128     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 129     format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js
 130     """
 131     result = select_sensordata('value_type=%s', sensor_type)
 132     return jsonify(result)
 133
 134
 135 @app.route('/data/', defaults={'timespan': 1})
 136 @app.route("/data/<int:timespan>", methods=['GET'])
 137 def data(timespan):
 138     granularity = 5 * timespan               # (every) minute(s) per day
 139     samples = 60/granularity * 24 * timespan # per hour over whole timespan
 140     s4m   = []
 141     s4m_x = []
 142     s5m   = []
 143     s5m_x = []
 144     end   = time.time()
 145     start = end - samples * granularity * 60
 146
 147     for i in range(int(samples)):
 148         s4m.append(uniform(-10,30))
 149         s5m.append(uniform(-10,30))
 150         s4mt = uniform(start, end)
 151         s5mt = uniform(start, end)
 152         s4m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s4mt)))
 153         s5m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s5mt)))
 154
 155     data = {
 156         '0316a2193bff':   s4m,
 157         '0316a2193bff_x': s4m_x,
 158         '0316a21383ff':   s5m,
 159         '0316a21383ff_x': s5m_x,
 160         }
 161
 162     return jsonify(data)
 163
 164
 165 @app.route("/")
 166 def index():
 167     return render_template('seepark_web.html', apikey=apikey)
 168