550 lines
18 KiB
Python
550 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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, protocol
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from twisted.internet.error import DNSLookupError
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from twisted.web.client import readBody, HTTPConnectionPool, Agent
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from twisted.web.http_headers import Headers
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from twisted.web._newclient import ResponseDone
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from synapse.http.endpoint import matrix_federation_endpoint
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from synapse.util.async import sleep
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from synapse.util.logcontext import preserve_context_over_fn
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import synapse.metrics
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from canonicaljson import encode_canonical_json
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from synapse.api.errors import (
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SynapseError, Codes, HttpResponseException,
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)
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from signedjson.sign import sign_json
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import cgi
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import simplejson as json
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import logging
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import random
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import sys
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import urllib
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import urlparse
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logger = logging.getLogger(__name__)
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outbound_logger = logging.getLogger("synapse.http.outbound")
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metrics = synapse.metrics.get_metrics_for(__name__)
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outgoing_requests_counter = metrics.register_counter(
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"requests",
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labels=["method"],
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)
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incoming_responses_counter = metrics.register_counter(
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"responses",
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labels=["method", "code"],
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)
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MAX_LONG_RETRIES = 10
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MAX_SHORT_RETRIES = 3
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class MatrixFederationEndpointFactory(object):
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def __init__(self, hs):
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self.tls_server_context_factory = hs.tls_server_context_factory
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def endpointForURI(self, uri):
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destination = uri.netloc
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return matrix_federation_endpoint(
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reactor, destination, timeout=10,
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ssl_context_factory=self.tls_server_context_factory
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)
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class MatrixFederationHttpClient(object):
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"""HTTP client used to talk to other homeservers over the federation
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protocol. Send client certificates and signs requests.
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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.hs = hs
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self.signing_key = hs.config.signing_key[0]
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self.server_name = hs.hostname
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pool = HTTPConnectionPool(reactor)
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pool.maxPersistentPerHost = 5
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pool.cachedConnectionTimeout = 2 * 60
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self.agent = Agent.usingEndpointFactory(
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reactor, MatrixFederationEndpointFactory(hs), pool=pool
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)
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self.clock = hs.get_clock()
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self.version_string = hs.version_string
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self._next_id = 1
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def _create_url(self, destination, path_bytes, param_bytes, query_bytes):
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return urlparse.urlunparse(
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("matrix", destination, path_bytes, param_bytes, query_bytes, "")
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)
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@defer.inlineCallbacks
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def _create_request(self, destination, method, path_bytes,
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body_callback, headers_dict={}, param_bytes=b"",
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query_bytes=b"", retry_on_dns_fail=True,
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timeout=None, long_retries=False):
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""" Creates and sends a request to the given url
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Returns:
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Deferred: resolves with the http response object on success.
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Fails with ``HTTPRequestException``: if we get an HTTP response
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code >= 300.
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"""
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headers_dict[b"User-Agent"] = [self.version_string]
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headers_dict[b"Host"] = [destination]
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url_bytes = self._create_url(
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destination, path_bytes, param_bytes, query_bytes
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)
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txn_id = "%s-O-%s" % (method, self._next_id)
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self._next_id = (self._next_id + 1) % (sys.maxint - 1)
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outbound_logger.info(
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"{%s} [%s] Sending request: %s %s",
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txn_id, destination, method, url_bytes
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)
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# XXX: Would be much nicer to retry only at the transaction-layer
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# (once we have reliable transactions in place)
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if long_retries:
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retries_left = MAX_LONG_RETRIES
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else:
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retries_left = MAX_SHORT_RETRIES
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http_url_bytes = urlparse.urlunparse(
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("", "", path_bytes, param_bytes, query_bytes, "")
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)
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log_result = None
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try:
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while True:
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producer = None
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if body_callback:
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producer = body_callback(method, http_url_bytes, headers_dict)
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try:
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def send_request():
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request_deferred = preserve_context_over_fn(
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self.agent.request,
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method,
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url_bytes,
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Headers(headers_dict),
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producer
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)
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return self.clock.time_bound_deferred(
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request_deferred,
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time_out=timeout / 1000. if timeout else 60,
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)
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response = yield preserve_context_over_fn(send_request)
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log_result = "%d %s" % (response.code, response.phrase,)
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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(
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"DNS Lookup failed to %s with %s",
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destination,
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e
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)
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log_result = "DNS Lookup failed to %s with %s" % (
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destination, e
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)
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raise
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logger.warn(
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"{%s} Sending request failed to %s: %s %s: %s - %s",
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txn_id,
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destination,
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method,
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url_bytes,
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type(e).__name__,
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_flatten_response_never_received(e),
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)
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log_result = "%s - %s" % (
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type(e).__name__, _flatten_response_never_received(e),
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)
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if retries_left and not timeout:
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if long_retries:
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delay = 4 ** (MAX_LONG_RETRIES + 1 - retries_left)
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delay = min(delay, 60)
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delay *= random.uniform(0.8, 1.4)
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else:
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delay = 0.5 * 2 ** (MAX_SHORT_RETRIES - retries_left)
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delay = min(delay, 2)
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delay *= random.uniform(0.8, 1.4)
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yield sleep(delay)
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retries_left -= 1
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else:
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raise
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finally:
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outbound_logger.info(
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"{%s} [%s] Result: %s",
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txn_id,
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destination,
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log_result,
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)
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if 200 <= response.code < 300:
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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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body = yield preserve_context_over_fn(readBody, response)
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raise HttpResponseException(
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response.code, response.phrase, body
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)
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defer.returnValue(response)
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def sign_request(self, destination, method, url_bytes, headers_dict,
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content=None):
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request = {
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"method": method,
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"uri": url_bytes,
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"origin": self.server_name,
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"destination": destination,
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}
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if content is not None:
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request["content"] = content
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request = sign_json(request, self.server_name, self.signing_key)
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auth_headers = []
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for key, sig in request["signatures"][self.server_name].items():
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auth_headers.append(bytes(
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"X-Matrix origin=%s,key=\"%s\",sig=\"%s\"" % (
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self.server_name, key, sig,
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)
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))
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headers_dict[b"Authorization"] = auth_headers
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@defer.inlineCallbacks
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def put_json(self, destination, path, data={}, json_data_callback=None,
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long_retries=False, timeout=None):
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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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json_data_callback (callable): A callable returning the dict to
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use as the request body.
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long_retries (bool): A boolean that indicates whether we should
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retry for a short or long time.
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timeout(int): How long to try (in ms) the destination for before
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giving up. None indicates no timeout.
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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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if not json_data_callback:
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def json_data_callback():
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return data
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def body_callback(method, url_bytes, headers_dict):
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json_data = json_data_callback()
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self.sign_request(
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destination, method, url_bytes, headers_dict, json_data
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)
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producer = _JsonProducer(json_data)
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return producer
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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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body_callback=body_callback,
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headers_dict={"Content-Type": ["application/json"]},
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long_retries=long_retries,
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timeout=timeout,
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)
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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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check_content_type_is_json(response.headers)
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def post_json(self, destination, path, data={}, long_retries=False,
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timeout=None):
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""" Sends the specifed json data using POST
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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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long_retries (bool): A boolean that indicates whether we should
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retry for a short or long time.
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timeout(int): How long to try (in ms) the destination for before
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giving up. None indicates no timeout.
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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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def body_callback(method, url_bytes, headers_dict):
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self.sign_request(
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destination, method, url_bytes, headers_dict, data
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)
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return _JsonProducer(data)
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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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body_callback=body_callback,
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headers_dict={"Content-Type": ["application/json"]},
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long_retries=long_retries,
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timeout=timeout,
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)
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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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check_content_type_is_json(response.headers)
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def get_json(self, destination, path, args={}, retry_on_dns_fail=True,
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timeout=None):
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""" GETs 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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timeout (int): How long to try (in ms) the destination for before
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giving up. None indicates no timeout and that the request will
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be retried.
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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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logger.debug("get_json args: %s", args)
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encoded_args = {}
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for k, vs in args.items():
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if isinstance(vs, basestring):
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vs = [vs]
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encoded_args[k] = [v.encode("UTF-8") for v in vs]
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query_bytes = urllib.urlencode(encoded_args, True)
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logger.debug("Query bytes: %s Retry DNS: %s", args, retry_on_dns_fail)
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def body_callback(method, url_bytes, headers_dict):
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self.sign_request(destination, method, url_bytes, headers_dict)
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return None
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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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body_callback=body_callback,
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retry_on_dns_fail=retry_on_dns_fail,
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timeout=timeout,
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)
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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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check_content_type_is_json(response.headers)
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def get_file(self, destination, path, output_stream, args={},
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retry_on_dns_fail=True, max_size=None):
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"""GETs a file from a given homeserver
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Args:
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destination (str): The remote server to send the HTTP request to.
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path (str): The HTTP path to GET.
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output_stream (file): File to write the response body to.
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args (dict): Optional dictionary used to create the query string.
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Returns:
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Deferred: resolves with an (int,dict) tuple of the file length and
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a dict of the response headers.
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Fails with ``HTTPRequestException`` if we get an HTTP response code
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>= 300
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"""
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encoded_args = {}
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for k, vs in args.items():
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if isinstance(vs, basestring):
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vs = [vs]
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encoded_args[k] = [v.encode("UTF-8") for v in vs]
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query_bytes = urllib.urlencode(encoded_args, True)
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logger.debug("Query bytes: %s Retry DNS: %s", query_bytes, retry_on_dns_fail)
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def body_callback(method, url_bytes, headers_dict):
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self.sign_request(destination, method, url_bytes, headers_dict)
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return None
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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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body_callback=body_callback,
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retry_on_dns_fail=retry_on_dns_fail
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)
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headers = dict(response.headers.getAllRawHeaders())
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try:
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length = yield preserve_context_over_fn(
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_readBodyToFile,
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response, output_stream, max_size
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)
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except:
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logger.exception("Failed to download body")
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raise
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defer.returnValue((length, headers))
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class _ReadBodyToFileProtocol(protocol.Protocol):
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def __init__(self, stream, deferred, max_size):
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self.stream = stream
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self.deferred = deferred
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self.length = 0
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self.max_size = max_size
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def dataReceived(self, data):
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self.stream.write(data)
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self.length += len(data)
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if self.max_size is not None and self.length >= self.max_size:
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self.deferred.errback(SynapseError(
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502,
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"Requested file is too large > %r bytes" % (self.max_size,),
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Codes.TOO_LARGE,
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))
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self.deferred = defer.Deferred()
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self.transport.loseConnection()
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def connectionLost(self, reason):
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if reason.check(ResponseDone):
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self.deferred.callback(self.length)
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else:
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self.deferred.errback(reason)
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def _readBodyToFile(response, stream, max_size):
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d = defer.Deferred()
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response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
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return d
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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.reset(jsn)
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def reset(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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def resumeProducing(self):
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pass
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def _flatten_response_never_received(e):
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if hasattr(e, "reasons"):
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return ", ".join(
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_flatten_response_never_received(f.value)
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for f in e.reasons
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)
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else:
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return "%s: %s" % (type(e).__name__, e.message,)
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def check_content_type_is_json(headers):
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"""
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Check that a set of HTTP headers have a Content-Type header, and that it
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is application/json.
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Args:
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headers (twisted.web.http_headers.Headers): headers to check
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Raises:
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RuntimeError if the
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"""
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c_type = headers.getRawHeaders("Content-Type")
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if c_type is None:
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raise RuntimeError(
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"No Content-Type header"
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)
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c_type = c_type[0] # only the first header
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val, options = cgi.parse_header(c_type)
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if val != "application/json":
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raise RuntimeError(
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"Content-Type not application/json: was '%s'" % c_type
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)
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