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import zmq
import json
from time import sleep
import random
class RpcClient():
def __init__ (self, default_server, default_port):
self.verbose = False
self.connected = False
# default values
self.port = default_port
self.server = default_server
def get_connection_details (self):
rc = {}
rc['server'] = self.server
rc['port'] = self.port
return rc
def pretty_json (self, json_str):
return json.dumps(json.loads(json_str), indent = 4, separators=(',', ': '), sort_keys = True)
def verbose_msg (self, msg):
if not self.verbose:
return
print "[verbose] " + msg
def create_jsonrpc_v2 (self, method_name, params = {}, id = None):
msg = {}
msg["jsonrpc"] = "2.0"
msg["method"] = method_name
msg["params"] = params
msg["id"] = id
return json.dumps(msg)
def invoke_rpc_method (self, method_name, params = {}, block = False):
rc, msg = self._invoke_rpc_method(method_name, params, block)
if not rc:
self.disconnect()
return rc, msg
def _invoke_rpc_method (self, method_name, params = {}, block = False):
if not self.connected:
return False, "Not connected to server"
id = random.randint(1, 1000)
msg = self.create_jsonrpc_v2(method_name, params, id = id)
self.verbose_msg("Sending Request To Server:\n\n" + self.pretty_json(msg) + "\n")
if block:
self.socket.send(msg)
else:
try:
self.socket.send(msg, flags = zmq.NOBLOCK)
except zmq.error.ZMQError:
return False, "Failed To Get Send Message"
got_response = False
if block:
response = self.socket.recv()
got_response = True
else:
for i in xrange(0 ,10):
try:
response = self.socket.recv(flags = zmq.NOBLOCK)
got_response = True
break
except zmq.error.Again:
sleep(0.2)
if not got_response:
return False, "Failed To Get Server Response"
self.verbose_msg("Server Response:\n\n" + self.pretty_json(response) + "\n")
# decode
response_json = json.loads(response)
if (response_json.get("jsonrpc") != "2.0"):
return False, "Malfromed Response ({0})".format(str(response))
if (response_json.get("id") != id):
return False, "Server Replied With Bad ID ({0})".format(str(response))
# error reported by server
if ("error" in response_json):
return True, response_json["error"]["message"]
# if no error there should be a result
if ("result" not in response_json):
return False, "Malfromed Response ({0})".format(str(response))
return True, response_json["result"]
def ping_rpc_server (self):
return self.invoke_rpc_method("ping", block = False)
def get_rpc_server_status (self):
return self.invoke_rpc_method("get_status")
def query_rpc_server (self):
return self.invoke_rpc_method("get_reg_cmds")
def set_verbose (self, mode):
self.verbose = mode
def disconnect (self):
if self.connected:
self.socket.close(linger = 0)
self.context.destroy(linger = 0)
self.connected = False
return True, ""
else:
return False, "Not connected to server"
def connect (self, server = None, port = None):
if self.connected:
self.disconnect()
self.context = zmq.Context()
self.server = (server if server else self.server)
self.port = (port if port else self.port)
# Socket to talk to server
self.transport = "tcp://{0}:{1}".format(self.server, self.port)
print "\nConnecting To RPC Server On {0}".format(self.transport)
self.socket = self.context.socket(zmq.REQ)
try:
self.socket.connect(self.transport)
except zmq.error.ZMQError as e:
return False, "ZMQ Error: Bad server or port name: " + str(e)
self.connected = True
# ping the server
rc, err = self.ping_rpc_server()
if not rc:
self.disconnect()
return rc, err
return True, ""
def reconnect (self):
# connect using current values
return self.connect()
if not self.connected:
return False, "Not connected to server"
# reconnect
return self.connect(self.server, self.port)
def is_connected (self):
return self.connected
def __del__ (self):
print "Shutting down RPC client\n"
self.context.destroy(linger = 0)
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