add more needed python3 modules to README

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

diff --git a/web/seepark_web.py b/web/seepark_web.py
index 526317407ed5382524d7c8198f62803b5aa12a70..596d4823410fbec7c435850ae7599f4d5da29dab 100644 (file)
--- a/web/seepark_web.py
+++ b/web/seepark_web.py
@@ -1,18 +1,77 @@
-from flask import Flask, render_template, jsonify
 from random import uniform
+import datetime
 import time
 import configparser
 import os
-app = Flask(__name__)
+from flask import Flask, render_template, jsonify, request
+import flask.json
+from sqlalchemy import create_engine
+
+
+class JSONEncoder(flask.json.JSONEncoder):
+    def default(self, object):
+        if isinstance(object, datetime.datetime):
+            return object.isoformat()
+        return super().default(object)
+
 
+def parse_datetime(date_str):
+    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');
+apikey = config.get('openweathermap', 'apikey')
+
+
+def open_engine(config):
+    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
+
+
+@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)
+
+
+@app.route('/api/<version>/sensor/<sensor_id>')
+def sensor(version, sensor_id):
+    """Return all sensor data
+
+    URL parameters:
+    begin=<datetime>, optional, format like "2018-05-19T21:07:53"
+    end=<datetime>, optional, format like "2018-05-19T21:07:53"
+    """
+    engine = open_engine(config)
+    with engine.connect() as conn:
+        where = ['sensor_id=%s']
+        sql_args = [sensor_id]
+        if 'begin' in request.args:
+            where.append('timestamp>=%s')
+            sql_args.append(request.args.get('begin', None, parse_datetime))
+        if 'end' in request.args:
+            where.append('timestamp<=%s')
+            sql_args.append(request.args.get('end', None, parse_datetime))
+        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 jsonify(result)
+
 
 @app.route('/data/', defaults={'timespan': 1})
 @app.route("/data/<int:timespan>", methods=['GET'])
 def data(timespan):
-
     granularity = 5 * timespan               # (every) minute(s) per day
     samples = 60/granularity * 24 * timespan # per hour over whole timespan
     s4m   = []