299 lines
9.3 KiB
Python
299 lines
9.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer, reactor
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from twisted.internet.error import DNSLookupError
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from twisted.web.client import _AgentBase, _URI, readBody, FileBodyProducer
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from twisted.web.http_headers import Headers
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from synapse.http.endpoint import matrix_endpoint
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from synapse.util.async import sleep
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from syutil.jsonutil import encode_canonical_json
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from synapse.api.errors import CodeMessageException, SynapseError
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from StringIO import StringIO
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import json
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import logging
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import urllib
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logger = logging.getLogger(__name__)
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# FIXME: SURELY these should be killed?!
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_destination_mappings = {
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"red": "localhost:8080",
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"blue": "localhost:8081",
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"green": "localhost:8082",
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}
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class HttpClient(object):
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""" Interface for talking json over http
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"""
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RETRY_DNS_LOOKUP_FAILURES = "__retry_dns"
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def put_json(self, destination, path, data):
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""" Sends the specifed json data using PUT
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Args:
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destination (str): The remote server to send the HTTP request
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to.
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path (str): The HTTP path.
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data (dict): A dict containing the data that will be used as
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the request body. This will be encoded as JSON.
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Returns:
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Deferred: Succeeds when we get a 2xx HTTP response. The result
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will be the decoded JSON body. On a 4xx or 5xx error response a
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CodeMessageException is raised.
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"""
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pass
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def get_json(self, destination, path, args=None):
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""" Get's some json from the given host homeserver and path
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Args:
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destination (str): The remote server to send the HTTP request
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to.
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path (str): The HTTP path.
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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Returns:
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Deferred: Succeeds when we get *any* HTTP response.
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The result of the deferred is a tuple of `(code, response)`,
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where `response` is a dict representing the decoded JSON body.
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"""
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pass
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class MatrixHttpAgent(_AgentBase):
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def __init__(self, reactor, pool=None):
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_AgentBase.__init__(self, reactor, pool)
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def request(self, destination, endpoint, method, path, params, query,
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headers, body_producer):
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host = b""
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port = 0
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fragment = b""
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parsed_URI = _URI(b"http", destination, host, port, path, params,
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query, fragment)
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# Set the connection pool key to be the destination.
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key = destination
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return self._requestWithEndpoint(key, endpoint, method, parsed_URI,
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headers, body_producer,
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parsed_URI.originForm)
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class TwistedHttpClient(HttpClient):
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""" Wrapper around the twisted HTTP client api.
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Attributes:
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agent (twisted.web.client.Agent): The twisted Agent used to send the
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requests.
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"""
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def __init__(self, hs):
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self.agent = MatrixHttpAgent(reactor)
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self.hs = hs
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@defer.inlineCallbacks
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def put_json(self, destination, path, data):
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if destination in _destination_mappings:
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destination = _destination_mappings[destination]
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response = yield self._create_request(
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destination.encode("ascii"),
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"PUT",
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path.encode("ascii"),
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producer=_JsonProducer(data),
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headers_dict={"Content-Type": ["application/json"]}
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)
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logger.debug("Getting resp body")
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body = yield readBody(response)
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logger.debug("Got resp body")
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defer.returnValue((response.code, body))
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@defer.inlineCallbacks
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def get_json(self, destination, path, args={}):
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if destination in _destination_mappings:
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destination = _destination_mappings[destination]
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logger.debug("get_json args: %s", args)
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retry_on_dns_fail = True
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if HttpClient.RETRY_DNS_LOOKUP_FAILURES in args:
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# FIXME: This isn't ideal, but the interface exposed in get_json
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# isn't comprehensive enough to give caller's any control over
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# their connection mechanics.
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retry_on_dns_fail = args.pop(HttpClient.RETRY_DNS_LOOKUP_FAILURES)
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query_bytes = urllib.urlencode(args, True)
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logger.debug("Query bytes: %s Retry DNS: %s", args, retry_on_dns_fail)
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response = yield self._create_request(
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destination.encode("ascii"),
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"GET",
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path.encode("ascii"),
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query_bytes=query_bytes,
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retry_on_dns_fail=retry_on_dns_fail
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)
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body = yield readBody(response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def post_urlencoded_get_json(self, destination, path, args={}):
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if destination in _destination_mappings:
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destination = _destination_mappings[destination]
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logger.debug("post_urlencoded_get_json args: %s", args)
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query_bytes = urllib.urlencode(args, True)
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response = yield self._create_request(
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destination.encode("ascii"),
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"POST",
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path.encode("ascii"),
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producer=FileBodyProducer(StringIO(urllib.urlencode(args))),
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headers_dict={"Content-Type": ["application/x-www-form-urlencoded"]}
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)
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body = yield readBody(response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def _create_request(self, destination, method, path_bytes, param_bytes=b"",
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query_bytes=b"", producer=None, headers_dict={},
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retry_on_dns_fail=True):
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""" Creates and sends a request to the given url
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"""
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headers_dict[b"User-Agent"] = [b"Synapse"]
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headers_dict[b"Host"] = [destination]
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logger.debug("Sending request to %s: %s %s;%s?%s",
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destination, method, path_bytes, param_bytes, query_bytes)
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logger.debug(
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"Types: %s",
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[
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type(destination), type(method), type(path_bytes),
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type(param_bytes),
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type(query_bytes)
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]
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)
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retries_left = 5
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# TODO: setup and pass in an ssl_context to enable TLS
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endpoint = self._getEndpoint(reactor, destination);
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while True:
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try:
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response = yield self.agent.request(
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destination,
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endpoint,
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method,
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path_bytes,
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param_bytes,
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query_bytes,
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Headers(headers_dict),
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producer
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)
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logger.debug("Got response to %s", method)
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break
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except Exception as e:
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if not retry_on_dns_fail and isinstance(e, DNSLookupError):
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logger.warn("DNS Lookup failed to %s with %s", destination,
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e)
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raise SynapseError(400, "Domain specified not found.")
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logger.exception("Got error in _create_request")
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_print_ex(e)
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if retries_left:
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yield sleep(2 ** (5 - retries_left))
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retries_left -= 1
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else:
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raise
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if 200 <= response.code < 300:
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# We need to update the transactions table to say it was sent?
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pass
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else:
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# :'(
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# Update transactions table?
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logger.error(
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"Got response %d %s", response.code, response.phrase
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)
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raise CodeMessageException(
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response.code, response.phrase
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)
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defer.returnValue(response)
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def _getEndpoint(self, reactor, destination):
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return matrix_endpoint(
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reactor, destination, timeout=10,
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ssl_context_factory=self.hs.tls_context_factory
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)
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class PlainHttpClient(TwistedHttpClient):
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def _getEndpoint(self, reactor, destination):
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return matrix_endpoint(reactor, destination, timeout=10)
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def _print_ex(e):
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if hasattr(e, "reasons") and e.reasons:
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for ex in e.reasons:
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_print_ex(ex)
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else:
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logger.exception(e)
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class _JsonProducer(object):
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""" Used by the twisted http client to create the HTTP body from json
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"""
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def __init__(self, jsn):
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self.body = encode_canonical_json(jsn)
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self.length = len(self.body)
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def startProducing(self, consumer):
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consumer.write(self.body)
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return defer.succeed(None)
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def pauseProducing(self):
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pass
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def stopProducing(self):
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pass
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