add qrcode server and hardware interface

bridge/hardware_interface.py

+#!/usr/bin/env python3
+
+from http.server import (
+    HTTPServer,
+    BaseHTTPRequestHandler
+)
+import time
+
+import serial
+
+spacelock = serial.Serial('/dev/ttyS0', baudrate=9600)
+
+def send_code(code):
+    print("sending code: %r" % (code,))
+    spacelock.write((code + '\n').encode())
+    time.sleep(0.1)
+    reply = spacelock.read(spacelock.in_waiting).decode(errors='replace')
+    print("reply: %r" % (reply,))
+    return reply
+
+class RequestHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        result = ''
+        try:
+            if self.path.startswith('/send/'):
+                result = send_code(self.path[6:])
+        except BaseException as exc:
+            result = str(exc)
+            self.send_response(503)
+        else:
+            self.send_response(200)
+
+        self.send_header("Content-type", "text")
+        self.end_headers()
+        self.wfile.write(result.encode('utf8', errors='replace'))
+
+if __name__ == '__main__':
+    httpd = HTTPServer(('', 8000), RequestHandler)
+    httpd.serve_forever()
+

bridge/qrcode_server.py

+#!/usr/bin/env python2
+
+import argparse
+import base64
+import hashlib
+import pprint
+import subprocess
+
+import cbor
+import zbar
+
+cli = argparse.ArgumentParser()
+cli.add_argument('device')
+cli.add_argument('--debug', action='store_true')
+args = cli.parse_args()
+
+# create a Processor
+proc = zbar.Processor()
+
+# configure the Processor
+# proc.parse_config('enable')
+proc.parse_config('disable')
+proc.parse_config('qrcode.enable')
+
+# initialize the Processor
+proc.init(args.device, enable_display=args.debug)
+
+if args.debug:
+    proc.visible = True
+
+def send(text):
+    subprocess.call(['curl', 'http://localhost:8000/send/' + text])
+
+# read at least one barcode (or until window closed)
+while True:
+    proc.process_one()
+    for symbol in proc.results:
+        message = symbol.data
+        print("Message:\n%s" % (pprint.pformat(message),))
+        send(message)
+