Restore register.py script removed in 5ace0dd892

This is intended to be an example of using the protocol from something
other than C++ and to be a building block for future test clients.

servatrice/scripts/mk_pypb.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+SRC_DIR=../../common/pb/
+DST_DIR=./pypb
+
+rm -rf "$DST_DIR"
+mkdir -p "$DST_DIR"
+protoc -I=$SRC_DIR --python_out=$DST_DIR $SRC_DIR/*.proto
+touch "$DST_DIR/__init__.py"
+

servatrice/scripts/register.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+import socket, sys, struct, time
+
+from pypb.server_message_pb2 import ServerMessage
+from pypb.session_commands_pb2 import Command_Register as Reg
+from pypb.commands_pb2 import CommandContainer as Cmd
+from pypb.event_server_identification_pb2 import Event_ServerIdentification as ServerId
+from pypb.response_pb2 import Response
+
+HOST = "localhost"
+PORT = 4747
+
+CMD_ID = 1
+
+def build_reg():
+    global CMD_ID
+    cmd = Cmd()
+    sc = cmd.session_command.add()
+
+    reg = sc.Extensions[Reg.ext]
+    reg.user_name = "testUser"
+    reg.email = "test@example.com"
+    reg.password = "password"
+
+    cmd.cmd_id = CMD_ID
+    CMD_ID += 1
+    return cmd
+
+def send(msg):
+    packed = struct.pack('>I', len(msg))
+    sock.sendall(packed)
+    sock.sendall(msg)
+
+def print_resp(resp):
+    print "<<<"
+    print repr(resp)
+    m = ServerMessage()
+    m.ParseFromString(bytes(resp))
+    print m
+
+def recv(sock):
+    print "< header"
+    header = sock.recv(4)
+    msg_size = struct.unpack('>I', header)[0]
+    print "< ", msg_size
+    raw_msg = sock.recv(msg_size)
+    print_resp(raw_msg)
+
+if __name__ == "__main__":
+    address = (HOST, PORT)
+    sock = socket.socket()
+
+    print "Connecting to server ", address
+    sock.connect(address)
+
+    # hack for old xml clients - server expects this and discards first message
+    print ">>> xml hack"
+    xmlClientHack = Cmd().SerializeToString()
+    send(xmlClientHack)
+    print sock.recv(60)
+
+    recv(sock)
+
+    print ">>> register"
+    r = build_reg()
+    print r
+    msg = r.SerializeToString()
+    send(msg)
+    recv(sock)
+
+    print "Done"
+