WIP add tx signer, rpc client option for cli signing

funga/eth/cli/client.py

@@ -0,0 +1,27 @@
+# standard imports
+import urllib.request
+import json
+
+# external imports
+import jsonrpc_std.interface
+
+
+class RPCHTTPClient:
+
+    def __init__(self, host='localhost', port=8000):
+        self.host = host
+        self.port = port
+        self.url = 'http://{}:{}'.format(host, port)
+
+
+    def rpc_sign_tx(self, tx, request_id=None, passphrase=''):
+        data_src = jsonrpc_std.interface.jsonrpc_request('personal_signTransaction', request_id=request_id)
+        data_src['params'].append(tx)
+        data_src['params'].append(passphrase)
+        data = json.dumps(data_src)
+        req = urllib.request.Request(self.url, data=data.encode('utf-8'))
+        req.add_header('Accept', 'application/json')
+        req.add_header('Content-Type', 'application/json')
+        r = urllib.request.urlopen(req)
+        v = r.read()
+        return v.decode('utf-8')