first rather simple implementation of to_dict() for our Sensors object

[chrisu/seepark.git] / web / seepark_web.py

diff --git a/web/seepark_web.py b/web/seepark_web.py
index 340c7b600511206f35646c92d3d36ce88c69c968..3ee9d9408ba6e08e4b52c04da6e133ab86deb3cd 100644 (file)
--- a/web/seepark_web.py
+++ b/web/seepark_web.py
@@ -3,9 +3,17 @@ import datetime
 import time
 import configparser
 import os
 import time
 import configparser
 import os

+import sys
+from collections import defaultdict

 from flask import Flask, render_template, jsonify, request
 import flask.json
 from flask import Flask, render_template, jsonify, request
 import flask.json

-from sqlalchemy import create_engine
+from flask_sqlalchemy import SQLAlchemy, inspect
+
+
+app_path = os.path.dirname(os.path.realpath(__file__))
+lib_path = os.path.join(cur_path, '..')
+sys.path.append(lib_path)
+from seeparklib.openweathermap import openweathermap_json, OpenWeatherMapError

 
 
 class JSONEncoder(flask.json.JSONEncoder):
 
 
 class JSONEncoder(flask.json.JSONEncoder):


@@ -19,40 +27,45 @@ def parse_datetime(date_str):
     return datetime.datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S')
 
 
     return datetime.datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S')
 
 

-app = Flask(__name__)
-app.json_encoder = JSONEncoder
-config = configparser.ConfigParser()
-config.read(os.environ['SEEPARKINI'])
-apikey = config.get('openweathermap', 'apikey')
-
-
-def open_engine(config):
+def get_sqlalchemy_database_uri(config):

     user = config.get('database', 'user')
     pwd = config.get('database', 'password')
     host = config.get('database', 'hostname')
     db = config.get('database', 'database')
     user = config.get('database', 'user')
     pwd = config.get('database', 'password')
     host = config.get('database', 'hostname')
     db = config.get('database', 'database')

-    engine = create_engine('mysql+mysqldb://{}:{}@{}/{}'.format(user, pwd, host, db), echo=False)
-    return engine
-
-
-def select_sensordata(initial_where, initial_sql_args):
-    engine = open_engine(config)
-    with engine.connect() as conn:
-        where = [initial_where]
-        sql_args = [initial_sql_args]
-        begin = None
-        end = None
-        if 'begin' in request.args:
-            where.append('timestamp>=%s')
-            begin = request.args.get('begin', None, parse_datetime)
-            sql_args.append(begin)
-        if 'end' in request.args:
-            where.append('timestamp<=%s')
-            end = request.args.get('end', None, parse_datetime)
-            sql_args.append(end)
-        sql = 'select * from sensors where {} order by id'.format(' and '.join(where))
-        cursor = conn.execute(sql, *sql_args)
-        result = [dict(row) for row in cursor]
+    return 'mysql+mysqldb://{}:{}@{}/{}'.format(user, pwd, host, db)
+
+
+config = configparser.ConfigParser()
+config.read(os.environ['SEEPARKINI'])
+apikey = config.get('openweathermap', 'apikey')
+cityid = config.get('openweathermap', 'cityid')
+mainsensor = config.get('temperature', 'mainsensor')
+
+app = Flask(__name__)
+app.json_encoder = JSONEncoder
+app.config['SQLALCHEMY_DATABASE_URI'] = get_sqlalchemy_database_uri(config)
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+db.reflect(app=app)
+
+
+class Sensors(db.Model):
+    __tablename__ = 'sensors'
+
+    # https://stackoverflow.com/a/37350445
+    def to_dict(self):
+        return {c.key: getattr(self, c.key)
+            for c in inspect(self).mapper.column_attrs}
+
+def select_sensordata(initial_where):
+    query = Sensors.query.filter(initial_where)
+    begin = request.args.get('begin', None, parse_datetime)
+    end = request.args.get('end', None, parse_datetime)
+    if begin is not None:
+        query = query.filter(Sensors.timestamp >= begin)
+    if end is not None:
+        query = query.filter(Sensors.timestamp <= end)
+    result = query.all()

 
     mode = request.args.get('mode', 'full')
     if mode == 'consolidated':
 
     mode = request.args.get('mode', 'full')
     if mode == 'consolidated':


@@ -79,17 +92,37 @@ def select_sensordata(initial_where, initial_sql_args):
             # TODO: filter out samples from 'result'
             # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
 
             # TODO: filter out samples from 'result'
             # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
 

-    return result
+    format = request.args.get('format', 'default')
+    if format == 'c3':
+        c3result = defaultdict(list)
+        for row in result:
+            c3result[row.sensor_id].append(row.value)
+            dt = row.timestamp.strftime('%Y-%m-%d %H:%M:%S')
+            c3result[row.sensor_id + '_x'].append(dt)
+        return c3result
+    else:
+        return [row.to_dict() for row in result]
+
+
+def currentairtemperature(apikey, cityid):
+    """Retruns the tuple temperature, datetime (as float, datetime) in case of success, otherwise None, None."""
+    try:
+        weatherdata = openweathermap_json(apikey, cityid)
+        return weatherdata['main']['temp'], datetime.datetime.fromtimestamp(weatherdata['dt'])
+    except OpenWeatherMapError:
+        return None, None
+
+
+def currentwatertemperature(sensorid):
+    result = Sensors.query.filter_by(sensor_id=sensorid).order_by(Sensors.timestamp.desc()).first()
+    return result.value, result.timestamp

 
 
 @app.route('/api/<version>/sensors/')
 def sensors(version):
     """List all sensors found in the database"""
 
 
 @app.route('/api/<version>/sensors/')
 def sensors(version):
     """List all sensors found in the database"""

-    engine = open_engine(config)
-    with engine.connect() as conn:
-        cursor = conn.execute('select distinct sensor_id, sensor_name, value_type from sensors')
-        result = [dict(row) for row in cursor]
-        return jsonify(result)
+    result = db.session.query(Sensors.sensor_id, Sensors.sensor_name, Sensors.value_type).distinct().all()
+    return jsonify(result)

 
 
 @app.route('/api/<version>/sensor/id/<sensor_id>')
 
 
 @app.route('/api/<version>/sensor/id/<sensor_id>')


@@ -100,8 +133,9 @@ def sensorid(version, sensor_id):
     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
     end=<datetime>, optional, format like "2018-05-19T21:07:53"
     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
     end=<datetime>, optional, format like "2018-05-19T21:07:53"
     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)

+    format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js

     """
     """

-    result = select_sensordata('sensor_id=%s', sensor_id)
+    result = select_sensordata(Sensors.sensor_id == sensor_id)

     return jsonify(result)
 
 
     return jsonify(result)
 
 


@@ -113,8 +147,9 @@ def sensortype(version, sensor_type):
     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
     end=<datetime>, optional, format like "2018-05-19T21:07:53"
     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)
     begin=<datetime>, optional, format like "2018-05-19T21:07:53"
     end=<datetime>, optional, format like "2018-05-19T21:07:53"
     mode=<full|consolidated>, optional. return all rows (default) or with lower resolution (for charts)

+    format=<default|c3>, optional. return result as returned by sqlalchemy (default) or formatted for c3.js

     """
     """

-    result = select_sensordata('value_type=%s', sensor_type)
+    result = select_sensordata(Sensors.value_type == sensor_type)

     return jsonify(result)
 
 
     return jsonify(result)
 
 


@@ -150,5 +185,14 @@ def data(timespan):
 
 @app.route("/")
 def index():
 
 @app.route("/")
 def index():

-    return render_template('seepark_web.html', apikey=apikey)
-
+    airvalue, airtime     = currentairtemperature(apikey, cityid)
+    watervalue, watertime = currentwatertemperature(mainsensor)
+
+    return render_template(
+        'seepark_web.html',
+        apikey=apikey,
+        watervalue=watervalue,
+        watertime=watertime,
+        airvalue=airvalue,
+        airtime=airtime,
+    )