Start to use sqlalchemy (not all API calls work).

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

diff --git a/web/seepark_web.py b/web/seepark_web.py
index 76a5b15d040dd97548c9dc56eadc6fbd878ab953..065e3f2a6365535dfae30cff3146d3e43c7cc9a0 100644 (file)
--- a/web/seepark_web.py
+++ b/web/seepark_web.py
@@ -3,9 +3,15 @@ import datetime
 import time
 import configparser
 import os
 import time
 import configparser
 import os

-from flask import Flask, render_template, jsonify
+import sys
+from collections import defaultdict
+from flask import Flask, render_template, jsonify, request

 import flask.json
 import flask.json

-from sqlalchemy import create_engine
+from flask_sqlalchemy import SQLAlchemy
+
+
+sys.path.append('..')
+from seeparklib.openweathermap import openweathermap_json, OpenWeatherMapError

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


@@ -15,40 +21,128 @@ class JSONEncoder(flask.json.JSONEncoder):
         return super().default(object)
 
 
         return super().default(object)
 
 

-app = Flask(__name__)
-app.json_encoder = JSONEncoder
-config = configparser.ConfigParser()
-config.read(os.environ['SEEPARKINI'])
-apikey = config.get('openweathermap', 'apikey')
+def parse_datetime(date_str):
+    return datetime.datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S')

 
 
 
 

-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
+    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')
+
+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'
+
+
+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':
+        if begin is None or end is None:
+            pass
+        else:
+            # copied from munin/master/_bin/munin-cgi-graph.in
+            resolutions = dict(
+                day   =   300,
+                week  =  1800,
+                month =  7200,
+                year  = 86400,
+            )
+            duration = (end - begin).total_seconds()
+            day = 60 * 60 * 24
+            if duration < day:
+                resolution = resolutions['day']
+            elif duration < 7 * day:
+                resolution = resolutions['week']
+            elif duration < 31 * day:
+                resolution = resolutions['month']
+            else:
+                resolution = resolutions['year']
+            # TODO: filter out samples from 'result'
+            # like loop over results and skip if timestamp(n+1)-timestamp(n)<resolution
+
+    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)
+        result = c3result
+    return 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/<sensor_id>')
-def sensor(version, sensor_id):
-    """Return all sensor data"""
-    engine = open_engine(config)
-    with engine.connect() as conn:
-        cursor = conn.execute('select * from sensors where sensor_id=%s order by id', sensor_id)
-        result = [dict(row) for row in cursor]
-        return jsonify(result)
+@app.route('/api/<version>/sensor/id/<sensor_id>')
+def sensorid(version, sensor_id):
+    """Return all data for a specific sensor
+
+    URL parameters:
+    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(Sensors.sensor_id == sensor_id)
+    return jsonify([row._asdict() for row in result])
+
+
+@app.route('/api/<version>/sensor/type/<sensor_type>')
+def sensortype(version, sensor_type):
+    """Return all data for a specific sensor type
+
+    URL parameters:
+    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(Sensors.value_type == sensor_type)
+    return jsonify(result)

 
 
 @app.route('/data/', defaults={'timespan': 1})
 
 
 @app.route('/data/', defaults={'timespan': 1})


@@ -83,5 +177,14 @@ 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('0316a21383ff') # config? mainwatertemp?
+
+    return render_template(
+        'seepark_web.html',
+        apikey=apikey,
+        watervalue=watervalue,
+        watertime=watertime,
+        airvalue=airvalue,
+        airtime=airtime,
+    )