# coding=utf-8
import json
import telnetlib


class Dubbo(telnetlib.Telnet):
    prompt = 'dubbo>'
    coding = 'utf-8'

    def __init__(self, host=None, port=0):
        super().__init__(host, port)
        self.write(b'\n')

    def command(self, flag, str_=""):
        data = self.read_until(flag.encode())
        self.write(str_.encode() 
 
+ b"\n")
        return data

    def invoke(self, service_name, method_name, arg):
        command_str = "invoke {0}.{1}({2})".format(
            service_name, method_name, json.dumps(arg))
        self.command(Dubbo.prompt, command_str)
        data = self.command(Dubbo.prompt, "")
        data = data.decode(Dubbo.coding, errors='
 
ignore').split('\n')[0].strip()
        return data

    def do(self, command_str):
        self.command(Dubbo.prompt, command_str)
        data = self.command(Dubbo.prompt, command_str)
        data = data.decode(Dubbo.coding, errors='ignore').split('\n')[0].strip()
        try:
            return json.loads(data)
        
 
except:
            return data