web/seepark_web.py

   1 from random import uniform
   2 import datetime
   3 import time
   4 import configparser
   5 import os
   6 import sys
   7 from collections import defaultdict
   8 from flask import Flask, render_template, jsonify, request
   9 import flask.json
  10 from flask_sqlalchemy import SQLAlchemy, inspect
  11
  12
  13 app_path = os.path.dirname(os.path.realpath(__file__))
  14 lib_path = os.path.join(app_path, '..')
  15 sys.path.append(lib_path)
  16 from seeparklib.openweathermap import openweathermap_json, OpenWeatherMapError
  17
  18
  19 # https://stackoverflow.com/a/37350445
  20 def sqlalchemy_model_to_dict(model):
  21     return {c.key: getattr(model, c.key)
  22         for c in inspect(model).mapper.column_attrs}
  23
  24
  25 class JSONEncoder(flask.json.JSONEncoder):
  26     def default(self, object):
  27         if isinstance(object, datetime.datetime):
  28             return object.isoformat()
  29         elif isinstance(object, db.Model):
  30             return sqlalchemy_model_to_dict(object)
  31         return super().default(object)
  32
  33
  34 def parse_datetime(date_str):
  35     return datetime.datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S')
  36
  37
  38 def get_sqlalchemy_database_uri(config):
  39     user = config.get('database', 'user')
  40     pwd = config.get('database', 'password')
  41     host = config.get('database', 'hostname')
  42     db = config.get('database', 'database')
  43     return 'mysql+mysqldb://{}:{}@{}/{}'.format(user, pwd, host, db)
  44
  45
  46 config = configparser.ConfigParser()
  47 config.read(os.environ['SEEPARKINI'])
  48 apikey = config.get('openweathermap', 'apikey')
  49 cityid = config.get('openweathermap', 'cityid')
  50 mainsensor = config.get('temperature', 'mainsensor')
  51
  52 app = Flask(__name__)
  53 app.json_encoder = JSONEncoder
  54 app.config['SQLALCHEMY_DATABASE_URI'] = get_sqlalchemy_database_uri(config)
  55 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
  56 db = SQLAlchemy(app)
  57 db.reflect(app=app)
  58
  59
  60 class Sensors(db.Model):
  61     __tablename__ = 'sensors'
  62
  63
  64 def select_sensordata(initial_where):
  65     query = Sensors.query.filter(initial_where)
  66     begin = request.args.get('begin', None, parse_datetime)
  67     end = request.args.get('end', None, parse_datetime)
  68     if begin is not None:
  69         query = query.filter(Sensors.timestamp >= begin)
  70     if end is not None:
  71         query = query.filter(Sensors.timestamp <= end)
  72     result = query.all()
  73
  74     mode = request.args.get('mode', 'full')
  75     if mode == 'consolidated':
  76         if begin is None or end is None:
  77             pass
  78         else:
  79             # copied from munin/master/_bin/munin-cgi-graph.in
  80             resolutions = dict(
  81                 day   =   300,
  82                 week  =  1800,
  83                 month =  7200,
  84                 year  = 86400,
  85             )
  86             duration = (end - begin).total_seconds()
  87             day = 60 * 60 * 24
  88             if duration < day:
  89                 resolution = resolutions['day']
  90             elif duration < 7 * day:
  91                 resolution = resolutions['week']
  92             elif duration < 31 * day:
  93                 resolution = resolutions['month']
  94             else:
  95                 resolution = resolutions['year']
  96             # TODO: filter out samples from 'result'
  97             # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
  98
  99     format = request.args.get('format', 'default')
 100     if format == 'c3':
 101         c3result = defaultdict(list)
 102         for row in result:
 103             c3result[row.sensor_id].append(row.value)
 104             dt = row.timestamp.strftime('%Y-%m-%d %H:%M:%S')
 105             c3result[row.sensor_id + '_x'].append(dt)
 106         return c3result
 107     else:
 108         return result
 109
 110
 111 def currentairtemperature(apikey, cityid):
 112     """Retruns the tuple temperature, datetime (as float, datetime) in case of success, otherwise None, None."""
 113     try:
 114         weatherdata = openweathermap_json(apikey, cityid)
 115         return weatherdata['main']['temp'], datetime.datetime.fromtimestamp(weatherdata['dt'])
 116     except OpenWeatherMapError:
 117         return None, None
 118
 119
 120 def currentwatertemperature(sensorid):
 121     result = Sensors.query.filter_by(sensor_id=sensorid).order_by(Sensors.timestamp.desc()).first()
 122     return result.value, result.timestamp
 123
 124
 125 @app.route('/api/<version>/sensors/')
 126 def sensors(version):
 127     """List all sensors found in the database"""
 128     result = db.session.query(Sensors.sensor_id, Sensors.sensor_name, Sensors.value_type).distinct().all()
 129     return jsonify(result)
 130
 131
 132 @app.route('/api/<version>/sensor/id/<sensor_id>')
 133 def sensorid(version, sensor_id):
 134     """Return all data for a specific sensor
 135
 136     URL parameters:
 137     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 138     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 139     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 140     format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js
 141     """
 142     result = select_sensordata(Sensors.sensor_id == sensor_id)
 143     return jsonify(result)
 144
 145
 146 @app.route('/api/<version>/sensor/type/<sensor_type>')
 147 def sensortype(version, sensor_type):
 148     """Return all data for a specific sensor type
 149
 150     URL parameters:
 151     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
 152     end=<datetime>, optional, format like "2018-05-19T21:07:53"
 153     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
 154     format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js
 155     """
 156     result = select_sensordata(Sensors.value_type == sensor_type)
 157     return jsonify(result)
 158
 159
 160 @app.route('/data/', defaults={'timespan': 1})
 161 @app.route("/data/<int:timespan>", methods=['GET'])
 162 def data(timespan):
 163     granularity = 5 * timespan               # (every) minute(s) per day
 164     samples = 60/granularity * 24 * timespan # per hour over whole timespan
 165     s4m   = []
 166     s4m_x = []
 167     s5m   = []
 168     s5m_x = []
 169     end   = time.time()
 170     start = end - samples * granularity * 60
 171
 172     for i in range(int(samples)):
 173         s4m.append(uniform(-10,30))
 174         s5m.append(uniform(-10,30))
 175         s4mt = uniform(start, end)
 176         s5mt = uniform(start, end)
 177         s4m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s4mt)))
 178         s5m_x.append(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(s5mt)))
 179
 180     data = {
 181         '0316a2193bff':   s4m,
 182         '0316a2193bff_x': s4m_x,
 183         '0316a21383ff':   s5m,
 184         '0316a21383ff_x': s5m_x,
 185         }
 186
 187     return jsonify(data)
 188
 189
 190 @app.route("/")
 191 def index():
 192     airvalue, airtime     = currentairtemperature(apikey, cityid)
 193     watervalue, watertime = currentwatertemperature(mainsensor)
 194
 195     return render_template(
 196         'seepark_web.html',
 197         apikey=apikey,
 198         watervalue=watervalue,
 199         watertime=watertime,
 200         airvalue=airvalue,
 201         airtime=airtime,
 202     )