python-rpc: add console.py

It allows one to connect to a running daemon or wallet, and use
its RPC API from python.

Usage: python -i console.py <port>

It will detect whether it's talking to a daemon or wallet and
initialize itself accordingly.

utils/python-rpc/console.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+import sys
+import subprocess
+import socket
+from framework import rpc
+from framework import wallet
+from framework import daemon
+
+USAGE = 'usage: python -i console.py <port>'
+try:
+  port = int(sys.argv[1])
+except:
+  print(USAGE)
+  sys.exit(1)
+
+# check for open port
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.settimeout(1)
+if s.connect_ex(('127.0.0.1', port)) != 0:
+  print('No wallet or daemon RPC on port ' + str(port))
+  sys.exit(1)
+s.close()
+
+# both wallet and daemon have a get_version JSON RPC
+rpc = rpc.JSONRPC('{protocol}://{host}:{port}'.format(protocol='http', host='127.0.0.1', port=port))
+get_version = {
+    'method': 'get_version',
+    'jsonrpc': '2.0', 
+    'id': '0'
+}
+try:
+  res = rpc.send_json_rpc_request(get_version)
+except Exception, e:
+  print('Failed to call version RPC: ' + str(e))
+  sys.exit(1)
+
+if 'version' not in res:
+  print('Server is not a monero process')
+  sys.exit(1)
+
+if 'status' in res:
+  rpc = daemon.Daemon(port=port)
+else:
+  rpc = wallet.Wallet(port=port)
+
+print('Connected to %s RPC on port %u' % ('daemon' if 'status' in res else 'wallet', port))
+print('The \'rpc\' object may now be used to use the API')