text: # Copyright (c) 2011 Jeff Garzik
  #
  # Previous copyright, from python-jsonrpc/jsonrpc/proxy.py:
  #
  # Copyright (c) 2007 Jan-Klaas Kollhof
  #
  # This file is part of jsonrpc.
  #
  # jsonrpc is free software; you can redistribute it and/or modify
  # it under the terms of the GNU Lesser General Public License as published by
  # the Free Software Foundation; either version 2.1 of the License, or
  # (at your option) any later version.
  #
  # This software is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public License
  # along with this software; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  """HTTP proxy for opening RPC connection to qogecoind.
  
  AuthServiceProxy has the following improvements over python-jsonrpc's
  ServiceProxy class:
  
  - HTTP connections persist for the life of the AuthServiceProxy object
    (if server supports HTTP/1.1)
  - sends protocol 'version', per JSON-RPC 1.1
  - sends proper, incrementing 'id'
  - sends Basic HTTP authentication headers
  - parses all JSON numbers that look like floats as Decimal
  - uses standard Python json lib
  """
  
  import base64
  import decimal
  from http import HTTPStatus
  import http.client
  import json
  import logging
  import os
  import socket
  import time
  import urllib.parse
  
  HTTP_TIMEOUT = 30
  USER_AGENT = "AuthServiceProxy/0.1"
  
  log = logging.getLogger("QogecoinRPC")
  
  class JSONRPCException(Exception):
      def __init__(self, rpc_error, http_status=None):
          try:
              errmsg = '%(message)s (%(code)i)' % rpc_error
          except (KeyError, TypeError):
              errmsg = ''
          super().__init__(errmsg)
          self.error = rpc_error
          self.http_status = http_status
  
  
  def EncodeDecimal(o):
      if isinstance(o, decimal.Decimal):
          return str(o)
      raise TypeError(repr(o) + " is not JSON serializable")
  
  class AuthServiceProxy():
      __id_count = 0
  
      # ensure_ascii: escape unicode as \uXXXX, passed to json.dumps
      def __init__(self, service_url, service_name=None, timeout=HTTP_TIMEOUT, connection=None, ensure_ascii=True):
          self.__service_url = service_url
          self._service_name = service_name
          self.ensure_ascii = ensure_ascii  # can be toggled on the fly by tests
          self.__url = urllib.parse.urlparse(service_url)
          user = None if self.__url.username is None else self.__url.username.encode('utf8')
          passwd = None if self.__url.password is None else self.__url.password.encode('utf8')
          authpair = user + b':' + passwd
          self.__auth_header = b'Basic ' + base64.b64encode(authpair)
          self.timeout = timeout
          self._set_conn(connection)
  
      def __getattr__(self, name):
          if name.startswith('__') and name.endswith('__'):
              # Python internal stuff
              raise AttributeError
          if self._service_name is not None:
              name = "%s.%s" % (self._service_name, name)
          return AuthServiceProxy(self.__service_url, name, connection=self.__conn)
  
      def _request(self, method, path, postdata):
          '''
          Do a HTTP request, with retry if we get disconnected (e.g. due to a timeout).
          This is a workaround for https://bugs.python.org/issue3566 which is fixed in Python 3.5.
          '''
          headers = {'Host': self.__url.hostname,
                     'User-Agent': USER_AGENT,
                     'Authorization': self.__auth_header,
                     'Content-type': 'application/json'}
          if os.name == 'nt':
              # Windows somehow does not like to re-use connections
              # TODO: Find out why the connection would disconnect occasionally and make it reusable on Windows
              # Avoid "ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine"
              self._set_conn()
          try:
              self.__conn.request(method, path, postdata, headers)
              return self._get_response()
          except (BrokenPipeError, ConnectionResetError):
              # Python 3.5+ raises BrokenPipeError when the connection was reset
              # ConnectionResetError happens on FreeBSD
              self.__conn.close()
              self.__conn.request(method, path, postdata, headers)
              return self._get_response()
          except OSError as e:
              # Workaround for a bug on macOS. See https://bugs.python.org/issue33450
              retry = '[Errno 41] Protocol wrong type for socket' in str(e)
              if retry:
                  self.__conn.close()
                  self.__conn.request(method, path, postdata, headers)
                  return self._get_response()
              else:
                  raise
  
      def get_request(self, *args, **argsn):
          AuthServiceProxy.__id_count += 1
  
          log.debug("-{}-> {} {}".format(
              AuthServiceProxy.__id_count,
              self._service_name,
              json.dumps(args or argsn, default=EncodeDecimal, ensure_ascii=self.ensure_ascii),
          ))
          if args and argsn:
              raise ValueError('Cannot handle both named and positional arguments')
          return {'version': '1.1',
                  'method': self._service_name,
                  'params': args or argsn,
                  'id': AuthServiceProxy.__id_count}
  
      def __call__(self, *args, **argsn):
          postdata = json.dumps(self.get_request(*args, **argsn), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
          response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
          if response['error'] is not None:
              raise JSONRPCException(response['error'], status)
          elif 'result' not in response:
              raise JSONRPCException({
                  'code': -343, 'message': 'missing JSON-RPC result'}, status)
          elif status != HTTPStatus.OK:
              raise JSONRPCException({
                  'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
          else:
              return response['result']
  
      def batch(self, rpc_call_list):
          postdata = json.dumps(list(rpc_call_list), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
          log.debug("--> " + postdata)
          response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
          if status != HTTPStatus.OK:
              raise JSONRPCException({
                  'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
          return response
  
      def _get_response(self):
          req_start_time = time.time()
          try:
              http_response = self.__conn.getresponse()
          except socket.timeout:
              raise JSONRPCException({
                  'code': -344,
                  'message': '%r RPC took longer than %f seconds. Consider '
                             'using larger timeout for calls that take '
                             'longer to return.' % (self._service_name,
                                                    self.__conn.timeout)})
          if http_response is None:
              raise JSONRPCException({
                  'code': -342, 'message': 'missing HTTP response from server'})
  
          content_type = http_response.getheader('Content-Type')
          if content_type != 'application/json':
              raise JSONRPCException(
                  {'code': -342, 'message': 'non-JSON HTTP response with \'%i %s\' from server' % (http_response.status, http_response.reason)},
                  http_response.status)
  
          responsedata = http_response.read().decode('utf8')
          response = json.loads(responsedata, parse_float=decimal.Decimal)
          elapsed = time.time() - req_start_time
          if "error" in response and response["error"] is None:
              log.debug("<-%s- [%.6f] %s" % (response["id"], elapsed, json.dumps(response["result"], default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
          else:
              log.debug("<-- [%.6f] %s" % (elapsed, responsedata))
          return response, http_response.status
  
      def __truediv__(self, relative_uri):
          return AuthServiceProxy("{}/{}".format(self.__service_url, relative_uri), self._service_name, connection=self.__conn)
  
      def _set_conn(self, connection=None):
          port = 80 if self.__url.port is None else self.__url.port
          if connection:
              self.__conn = connection
              self.timeout = connection.timeout
          elif self.__url.scheme == 'https':
              self.__conn = http.client.HTTPSConnection(self.__url.hostname, port, timeout=self.timeout)
          else:
              self.__conn = http.client.HTTPConnection(self.__url.hostname, port, timeout=self.timeout)
  