# 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 dashd. 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 socket import time import urllib.parse HTTP_TIMEOUT = 30 USER_AGENT = "AuthServiceProxy/0.1" log = logging.getLogger("BitcoinRPC") 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) port = 80 if self.__url.port is None else self.__url.port 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) if connection: # Callables re-use the connection of the original proxy self.__conn = connection elif self.__url.scheme == 'https': self.__conn = http.client.HTTPSConnection(self.__url.hostname, port, timeout=timeout) else: self.__conn = http.client.HTTPConnection(self.__url.hostname, port, timeout=timeout) 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'} try: self.__conn.request(method, path, postdata, headers) return self._get_response() except http.client.BadStatusLine as e: if e.line == "''": # if connection was closed, try again self.__conn.close() self.__conn.request(method, path, postdata, headers) return self._get_response() else: raise except (BrokenPipeError, ConnectionResetError): # Python 3.5+ raises BrokenPipeError instead of BadStatusLine when the connection was reset # ConnectionResetError happens on FreeBSD with Python 3.4 self.__conn.close() self.__conn.request(method, path, postdata, headers) return self._get_response() 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)