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# 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 bitcoind.
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
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):
try:
errmsg = '%(message)s (%(code)i)' % rpc_error
except (KeyError, TypeError):
errmsg = ''
super().__init__(errmsg)
self.error = rpc_error
def EncodeDecimal(o):
if isinstance(o, decimal.Decimal):
return str(o)
raise TypeError(repr(o) + " is not JSON serializable")
class AuthServiceProxy(object):
__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)
if self.__url.port is None:
port = 80
else:
port = self.__url.port
(user, passwd) = (self.__url.username, self.__url.password)
try:
user = user.encode('utf8')
except AttributeError:
pass
try:
passwd = passwd.encode('utf8')
except AttributeError:
pass
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("-%s-> %s %s" % (AuthServiceProxy.__id_count, self._service_name,
json.dumps(args, 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 = self._request('POST', self.__url.path, postdata.encode('utf-8'))
if response['error'] is not None:
raise JSONRPCException(response['error'])
elif 'result' not in response:
raise JSONRPCException({
'code': -343, 'message': 'missing JSON-RPC result'})
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)
return self._request('POST', self.__url.path, postdata.encode('utf-8'))
def _get_response(self):
req_start_time = time.time()
try:
http_response = self.__conn.getresponse()
except socket.timeout as e:
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)})
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
def __truediv__(self, relative_uri):
return AuthServiceProxy("{}/{}".format(self.__service_url, relative_uri), self._service_name, connection=self.__conn)
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