first draft of QR Code serial reader

tools/qrcode_reader.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import io
+import serial
+import requests
+
+
+class Connector():
+    def __init__(self, login_url, checkin_url, username=None, password=None):
+        self.login_url = login_url
+        self.checkin_url = checkin_url
+        self.session = requests.Session()
+        json = {}
+        if username:
+            json['username'] = username
+        if password:
+            json['password'] = password
+        req = self.session.post(login_url, json=json, verify=False)
+        req.raise_for_status()
+        req.connection.close()
+
+    def checkin(self, code):
+        req = self.session.put(self.checkin_url + '?order_nr=' + code[:9], json={'attended': True}, verify=False)
+        req.raise_for_status()
+        req.connection.close()
+
+
+
+def scan():
+    ser = serial.Serial(port='/dev/ttyACM0', timeout=1)
+    ser_io = io.TextIOWrapper(io.BufferedRWPair(ser, ser, 1), newline='\r', line_buffering=True)
+    while True:
+        line = ser_io.readline().strip()
+        if not line:
+            continue
+        yield line
+
+
+if __name__ == '__main__':
+    connector = Connector(login_url='https://localhost:5242/v1.0/login',
+                          checkin_url='https://localhost:5242/v1.0/events/1490640884_8820477-7-7gvft6nlrs2o73fza54a6yeywiowmj8v/tickets/',
+                          username='admin',
+                          password='eventman')
+    try:
+        for code in scan():
+            print(code)
+            connector.checkin(code)
+    except KeyboardInterrupt:
+        print('exiting...')