Using context managers to open files.

[chrisu/seepark.git] / seewasser.py

diff --git a/seewasser.py b/seewasser.py
index 1697206483ce4fc465a2da21c29fe26117473e5d..600bf3d61716e7ce3c9f01c352d71daac8805efd 100755 (executable)
--- a/seewasser.py
+++ b/seewasser.py
@@ -1,31 +1,124 @@
 #! /usr/bin/python3
 
+import argparse
+import logging
 import datetime
+import re
+import sys
+import csv
+import os
+import configparser
+from sqlalchemy import create_engine, exc
+import warnings
+import MySQLdb.cursors
 
+#May 27 21:32 /sys/bus/w1/devices/28-0416a1bab9ff
+#May 27 21:33 /sys/bus/w1/devices/28-0416a1ac66ff
+#May 27 21:35 /sys/bus/w1/devices/28-0516a207a4ff
+#May 27 21:38 /sys/bus/w1/devices/28-0316a2193bff
+#May 27 21:38 /sys/bus/w1/devices/28-0316a21383ff
 
-jetzt = datetime.datetime.now()
-
-# print(jetzt)
-
+# Eine Funktion:
 # einen Sensor auslesen
 #/sys/bus/w1/devices/
-sensorfile = "/sys/bus/w1/devices/28-0316a21383ff/w1_slave"
 
-file = open(sensorfile)
+class ReadsensorError(RuntimeError):
+    pass
+    
+    
+def readsensor(sensor_id):
+    sensorfile = "/sys/bus/w1/devices/28-{}/w1_slave".format(sensor_id)
+    file = open(sensorfile)
+
+    # Inhalt des Sensors:
+    # 64 01 4b 46 7f ff 0c 10 01 : crc=01 YES
+    # 64 01 4b 46 7f ff 0c 10 01 t=22250
+
+    # Suche nach YES
+    linecrc = file.readline()
+    match = re.search(": crc=[0-9a-f]{2} (YES|NO)",linecrc)
+
+    yesno = match.group(1)
+    if yesno != "YES":
+        raise ReadsensorError('Could not evaluate sensorfile "{}"'.format(sensorfile))
+        
+    # Temperatur raus
+    linetemp = file.readline()
+    match = re.search(" t=([-0-9]+)",linetemp)
+
+    temp_raw = match.group(1)
+    temp = float(temp_raw)/1000
+
+    file.close()
+    jetzt = datetime.datetime.now()
+
+    return jetzt, temp_raw, temp
+
+
+def writesensordatacsv(config, sensor_id, sensor_name, timestamp, value_type, value_raw, value):
+    # Schreiben des csv-files
+    with open(os.path.expanduser(config.get("csv", "filename")), "a", newline = "") as file:
+        writer = csv.writer(file, dialect = "excel")
+        writer.writerow([timestamp.strftime("%Y-%m-%d %H:%M"), sensor_id, sensor_name, "{:.1f}".format(value)])
+
+
+def readcsvfile(csvfile):
+    with open(csvfile, "r", newline="") as file:
+        reader = csv.DictReader(file, dialect = "excel", fieldnames=("timestamp", "sensor_id", "sensor_name", "value"))
+        records = []
+        for row in reader:
+            records.append(row)
+    return records
 
-content = file.read()
 
-file.close()
+def writesensordatadb(config, sensor_id, sensor_name, timestamp, value_type, value_raw, value):
+    # Schreiben des db-files
+    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)
+    conn = engine.connect()
+    with warnings.catch_warnings():
+        # ignore _mysql_exceptions.IntegrityError: (1062, "Duplicate entry '0316a2193bff-2018-08-29 14:30:00' for key 'sensorid_timestamp'")
+        # TODO: the following doesn't work
+        warnings.simplefilter("ignore", category=MySQLdb.cursors.Warning)
+        # TODO: this does but …?!
+        try:
+            conn.execute("insert into sensors (sensor_id, sensor_name, value_type, value_raw, value, timestamp) values (%s,%s,%s,%s,%s,%s)", sensor_id, sensor_name, value_type, value_raw, value, timestamp)
+        except exc.IntegrityError as e:
+            if "1062" in str(e):
+                pass
+            else:
+                raise
+    conn.close()
 
-# Inhalt des Sensors:
-# 64 01 4b 46 7f ff 0c 10 01 : crc=01 YES
-# 64 01 4b 46 7f ff 0c 10 01 t=22250
 
-temp = content[-6:-1]
-temp = float(temp)/1000
+def main(configfile, fromcsvfile):
+    config = configparser.ConfigParser()
+    config.read(configfile)
+    
+    value_type = "Wassertemperatur"
+    for sensor_id, sensor_name in config.items('temperature'):
+        if fromcsvfile:
+            # "timestamp", "sensor_id", "sensor_name", "value"
+            for record in readcsvfile(fromcsvfile):
+                timestamp, sensor_id, sensor_name, value = (record["timestamp"], record["sensor_id"], record["sensor_name"], float(record["value"]))
+                value_raw = None
+                writesensordatadb(config, sensor_id, sensor_name, timestamp, value_type, value_raw, value)
+        else:
+            timestamp, value_raw, value = readsensor(sensor_id)
+            writesensordatacsv(config, sensor_id, sensor_name, timestamp, value_type, value_raw, value)
+            writesensordatadb(config, sensor_id, sensor_name, timestamp, value_type, value_raw, value)
+        logging.info('Sensor {}: {:.1f}°C'.format(sensor_id, value))
 
 
-print(temp)
+if __name__ == '__main__':
+    default_config_file = os.path.expanduser('~/seewasser.ini')
+    parser = argparse.ArgumentParser(description='Read sensor data')
+    parser.add_argument('--config', default=default_config_file, help='configuration file')
+    parser.add_argument('--fromcsvfile', help='write values from csv file to database')
+    args = parser.parse_args()
+    main(args.config, args.fromcsvfile)
 
-# Nur für die Ausgabe wird gerundet
-print('Die Seetemperatur ist {:.1f}°C'.format(temp))
\ No newline at end of file