refactored temp_log.py for versioned line formats, more extendable data return

temp_log.py

@@ -1,21 +1,47 @@
 #! /usr/bin/env python
 import serial, sys, time, io
-serialPort = '/dev/ttyACM0'
-try:
-    serialPort = sys.argv[1]
-except Exception, e:
+defaultSerialPort = '/dev/ttyACM0'
+defaultVersion = 0
+
+class ParseException(Exception):
+    """Parser Exceptions"""
     pass
-ser = serial.Serial(port=serialPort, baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
-sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))
-ser.isOpen()
-buffer = ''
-while True:
+
+
+def parse_line(line, version = defaultVersion):
+    """Parses a line and returns an array index by name of the data available"""
+    # @TODO This could be a class based versioning?
+    data = {}
+    if (version == 0):
+        line = line.split(' ')
+        data['temperature'] = float(line[-2])
+    else:
+        raise ParseException('Unimplemented line version', version)
+    return data
+
+
+def main(args = sys.argv):
+    # @TODO switch to parse args or similar
+    # @TODO parse of temperature logger line version
+    serialPort = defaultSerialPort
+    lineVersion = defaultVersion
     try:
-        buffer = ser.readline()
-        buffer_split = buffer.split(' ')
-        temp = float(buffer_split[-2])
-        print unicode(time.time()) + ',' + unicode(temp)
-        sys.stdout.flush()
+        serialPort = sys.argv[1]
     except Exception, e:
-        sys.stderr.write(str(e) + '\n')
-        continue
+        pass
+    ser = serial.Serial(port=serialPort, baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
+    sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))
+    ser.isOpen()
+    buffer = ''
+    while True:
+        try:
+            buffer = ser.readline()
+            data = parse_line(buffer, lineVersion)
+            print unicode(time.time()) + ',' + unicode(data['temperature'])
+            sys.stdout.flush()
+        except Exception, e:
+            sys.stderr.write(str(e) + '\n')
+            continue
+
+if __name__ == '__main__':
+    main(sys.argv)