572 lines
19 KiB
Python
572 lines
19 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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"""The transport layer is responsible for both sending transactions to remote
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home servers and receiving a variety of requests from other home servers.
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Typically, this is done over HTTP (and all home servers are required to
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support HTTP), however individual pairings of servers may decide to communicate
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over a different (albeit still reliable) protocol.
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"""
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from twisted.internet import defer
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from synapse.api.urls import FEDERATION_PREFIX as PREFIX
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from synapse.api.errors import Codes, SynapseError
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from synapse.util.logutils import log_function
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import logging
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import json
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import re
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logger = logging.getLogger(__name__)
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class TransportLayer(object):
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"""This is a basic implementation of the transport layer that translates
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transactions and other requests to/from HTTP.
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Attributes:
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server_name (str): Local home server host
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server (synapse.http.server.HttpServer): the http server to
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register listeners on
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client (synapse.http.client.HttpClient): the http client used to
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send requests
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request_handler (TransportRequestHandler): The handler to fire when we
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receive requests for data.
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received_handler (TransportReceivedHandler): The handler to fire when
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we receive data.
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"""
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def __init__(self, homeserver, server_name, server, client):
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"""
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Args:
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server_name (str): Local home server host
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server (synapse.protocol.http.HttpServer): the http server to
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register listeners on
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client (synapse.protocol.http.HttpClient): the http client used to
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send requests
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"""
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self.keyring = homeserver.get_keyring()
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self.server_name = server_name
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self.server = server
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self.client = client
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self.request_handler = None
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self.received_handler = None
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@log_function
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def get_context_state(self, destination, context):
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""" Requests all state for a given context (i.e. room) from the
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given server.
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Args:
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destination (str): The host name of the remote home server we want
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to get the state from.
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context (str): The name of the context we want the state of
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Returns:
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Deferred: Results in a dict received from the remote homeserver.
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"""
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logger.debug("get_context_state dest=%s, context=%s",
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destination, context)
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subpath = "/state/%s/" % context
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return self._do_request_for_transaction(destination, subpath)
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@log_function
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def get_pdu(self, destination, pdu_origin, pdu_id):
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""" Requests the pdu with give id and origin from the given server.
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Args:
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destination (str): The host name of the remote home server we want
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to get the state from.
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pdu_origin (str): The home server which created the PDU.
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pdu_id (str): The id of the PDU being requested.
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Returns:
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Deferred: Results in a dict received from the remote homeserver.
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"""
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logger.debug("get_pdu dest=%s, pdu_origin=%s, pdu_id=%s",
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destination, pdu_origin, pdu_id)
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subpath = "/pdu/%s/%s/" % (pdu_origin, pdu_id)
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return self._do_request_for_transaction(destination, subpath)
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@log_function
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def backfill(self, dest, context, pdu_tuples, limit):
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""" Requests `limit` previous PDUs in a given context before list of
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PDUs.
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Args:
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dest (str)
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context (str)
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pdu_tuples (list)
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limt (int)
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Returns:
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Deferred: Results in a dict received from the remote homeserver.
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"""
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logger.debug(
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"backfill dest=%s, context=%s, pdu_tuples=%s, limit=%s",
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dest, context, repr(pdu_tuples), str(limit)
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)
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if not pdu_tuples:
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return
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subpath = "/backfill/%s/" % context
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args = {"v": ["%s,%s" % (i, o) for i, o in pdu_tuples]}
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args["limit"] = limit
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return self._do_request_for_transaction(
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dest,
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subpath,
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args=args,
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)
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@defer.inlineCallbacks
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@log_function
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def send_transaction(self, transaction, json_data_callback=None):
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""" Sends the given Transaction to it's destination
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Args:
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transaction (Transaction)
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Returns:
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Deferred: Results of the deferred is a tuple in the form of
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(response_code, response_body) where the response_body is a
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python dict decoded from json
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"""
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logger.debug(
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"send_data dest=%s, txid=%s",
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transaction.destination, transaction.transaction_id
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)
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if transaction.destination == self.server_name:
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raise RuntimeError("Transport layer cannot send to itself!")
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# FIXME: This is only used by the tests. The actual json sent is
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# generated by the json_data_callback.
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json_data = transaction.get_dict()
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code, response = yield self.client.put_json(
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transaction.destination,
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path=PREFIX + "/send/%s/" % transaction.transaction_id,
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data=json_data,
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json_data_callback=json_data_callback,
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)
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logger.debug(
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"send_data dest=%s, txid=%s, got response: %d",
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transaction.destination, transaction.transaction_id, code
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)
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defer.returnValue((code, response))
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@defer.inlineCallbacks
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@log_function
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def make_query(self, destination, query_type, args, retry_on_dns_fail):
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path = PREFIX + "/query/%s" % query_type
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response = yield self.client.get_json(
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destination=destination,
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path=path,
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args=args,
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retry_on_dns_fail=retry_on_dns_fail,
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)
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defer.returnValue(response)
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@defer.inlineCallbacks
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def _authenticate_request(self, request):
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json_request = {
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"method": request.method,
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"uri": request.uri,
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"destination": self.server_name,
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"signatures": {},
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}
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content = None
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origin = None
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if request.method == "PUT":
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#TODO: Handle other method types? other content types?
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try:
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content_bytes = request.content.read()
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content = json.loads(content_bytes)
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json_request["content"] = content
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except:
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raise SynapseError(400, "Unable to parse JSON", Codes.BAD_JSON)
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def parse_auth_header(header_str):
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try:
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params = auth.split(" ")[1].split(",")
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param_dict = dict(kv.split("=") for kv in params)
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def strip_quotes(value):
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if value.startswith("\""):
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return value[1:-1]
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else:
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return value
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origin = strip_quotes(param_dict["origin"])
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key = strip_quotes(param_dict["key"])
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sig = strip_quotes(param_dict["sig"])
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return (origin, key, sig)
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except:
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raise SynapseError(
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400, "Malformed Authorization header", Codes.UNAUTHORIZED
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)
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auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
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if not auth_headers:
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raise SynapseError(
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401, "Missing Authorization headers", Codes.UNAUTHORIZED,
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)
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for auth in auth_headers:
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if auth.startswith("X-Matrix"):
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(origin, key, sig) = parse_auth_header(auth)
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json_request["origin"] = origin
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json_request["signatures"].setdefault(origin,{})[key] = sig
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if not json_request["signatures"]:
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raise SynapseError(
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401, "Missing Authorization headers", Codes.UNAUTHORIZED,
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)
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yield self.keyring.verify_json_for_server(origin, json_request)
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defer.returnValue((origin, content))
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def _with_authentication(self, handler):
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@defer.inlineCallbacks
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def new_handler(request, *args, **kwargs):
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try:
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(origin, content) = yield self._authenticate_request(request)
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response = yield handler(
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origin, content, request.args, *args, **kwargs
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)
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except:
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logger.exception("_authenticate_request failed")
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raise
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defer.returnValue(response)
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return new_handler
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@log_function
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def register_received_handler(self, handler):
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""" Register a handler that will be fired when we receive data.
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Args:
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handler (TransportReceivedHandler)
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"""
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self.received_handler = handler
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# This is when someone is trying to send us a bunch of data.
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self.server.register_path(
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"PUT",
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re.compile("^" + PREFIX + "/send/([^/]*)/$"),
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self._with_authentication(self._on_send_request)
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)
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@log_function
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def register_request_handler(self, handler):
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""" Register a handler that will be fired when we get asked for data.
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Args:
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handler (TransportRequestHandler)
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"""
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self.request_handler = handler
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# TODO(markjh): Namespace the federation URI paths
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# This is for when someone asks us for everything since version X
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/pull/$"),
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self._with_authentication(
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lambda origin, content, query:
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handler.on_pull_request(query["origin"][0], query["v"])
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)
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)
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# This is when someone asks for a data item for a given server
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# data_id pair.
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/pdu/([^/]*)/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, pdu_origin, pdu_id:
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handler.on_pdu_request(pdu_origin, pdu_id)
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)
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)
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# This is when someone asks for all data for a given context.
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/state/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, context:
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handler.on_context_state_request(context)
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)
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)
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/backfill/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, context:
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self._on_backfill_request(
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context, query["v"], query["limit"]
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)
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)
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)
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/context/([^/]*)/$"),
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self._with_authentication(
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lambda origin, content, query, context:
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handler.on_context_pdus_request(context)
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)
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)
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# This is when we receive a server-server Query
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self.server.register_path(
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"GET",
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re.compile("^" + PREFIX + "/query/([^/]*)$"),
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self._with_authentication(
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lambda origin, content, query, query_type:
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handler.on_query_request(
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query_type, {k: v[0] for k, v in query.items()}
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)
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)
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)
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@defer.inlineCallbacks
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@log_function
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def _on_send_request(self, origin, content, query, transaction_id):
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""" Called on PUT /send/<transaction_id>/
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Args:
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request (twisted.web.http.Request): The HTTP request.
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transaction_id (str): The transaction_id associated with this
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request. This is *not* None.
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Returns:
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Deferred: Results in a tuple of `(code, response)`, where
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`response` is a python dict to be converted into JSON that is
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used as the response body.
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"""
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# Parse the request
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try:
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transaction_data = content
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logger.debug(
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"Decoded %s: %s",
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transaction_id, str(transaction_data)
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)
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# We should ideally be getting this from the security layer.
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# origin = body["origin"]
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# Add some extra data to the transaction dict that isn't included
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# in the request body.
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transaction_data.update(
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transaction_id=transaction_id,
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destination=self.server_name
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)
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except Exception as e:
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logger.exception(e)
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defer.returnValue((400, {"error": "Invalid transaction"}))
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return
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try:
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code, response = yield self.received_handler.on_incoming_transaction(
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transaction_data
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)
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except:
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logger.exception("on_incoming_transaction failed")
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raise
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defer.returnValue((code, response))
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@defer.inlineCallbacks
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@log_function
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def _do_request_for_transaction(self, destination, subpath, args={}):
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"""
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Args:
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destination (str)
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path (str)
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args (dict): This is parsed directly to the HttpClient.
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Returns:
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Deferred: Results in a dict.
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"""
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data = yield self.client.get_json(
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destination,
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path=PREFIX + subpath,
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args=args,
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)
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# Add certain keys to the JSON, ready for decoding as a Transaction
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data.update(
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origin=destination,
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destination=self.server_name,
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transaction_id=None
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)
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defer.returnValue(data)
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@log_function
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def _on_backfill_request(self, context, v_list, limits):
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if not limits:
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return defer.succeed(
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(400, {"error": "Did not include limit param"})
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)
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limit = int(limits[-1])
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versions = [v.split(",", 1) for v in v_list]
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return self.request_handler.on_backfill_request(
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context, versions, limit)
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class TransportReceivedHandler(object):
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""" Callbacks used when we receive a transaction
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"""
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def on_incoming_transaction(self, transaction):
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""" Called on PUT /send/<transaction_id>, or on response to a request
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that we sent (e.g. a backfill request)
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Args:
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transaction (synapse.transaction.Transaction): The transaction that
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was sent to us.
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Returns:
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twisted.internet.defer.Deferred: A deferred that gets fired when
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the transaction has finished being processed.
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The result should be a tuple in the form of
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`(response_code, respond_body)`, where `response_body` is a python
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dict that will get serialized to JSON.
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On errors, the dict should have an `error` key with a brief message
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of what went wrong.
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"""
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pass
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class TransportRequestHandler(object):
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""" Handlers used when someone want's data from us
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"""
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def on_pull_request(self, versions):
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""" Called on GET /pull/?v=...
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This is hit when a remote home server wants to get all data
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after a given transaction. Mainly used when a home server comes back
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online and wants to get everything it has missed.
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Args:
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versions (list): A list of transaction_ids that should be used to
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determine what PDUs the remote side have not yet seen.
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Returns:
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Deferred: Resultsin a tuple in the form of
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`(response_code, respond_body)`, where `response_body` is a python
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dict that will get serialized to JSON.
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On errors, the dict should have an `error` key with a brief message
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of what went wrong.
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"""
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pass
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def on_pdu_request(self, pdu_origin, pdu_id):
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""" Called on GET /pdu/<pdu_origin>/<pdu_id>/
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Someone wants a particular PDU. This PDU may or may not have originated
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from us.
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Args:
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pdu_origin (str)
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pdu_id (str)
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Returns:
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Deferred: Resultsin a tuple in the form of
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`(response_code, respond_body)`, where `response_body` is a python
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dict that will get serialized to JSON.
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On errors, the dict should have an `error` key with a brief message
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of what went wrong.
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"""
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pass
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def on_context_state_request(self, context):
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""" Called on GET /state/<context>/
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Gets hit when someone wants all the *current* state for a given
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contexts.
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Args:
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context (str): The name of the context that we're interested in.
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Returns:
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twisted.internet.defer.Deferred: A deferred that gets fired when
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the transaction has finished being processed.
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The result should be a tuple in the form of
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`(response_code, respond_body)`, where `response_body` is a python
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dict that will get serialized to JSON.
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On errors, the dict should have an `error` key with a brief message
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of what went wrong.
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"""
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pass
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def on_backfill_request(self, context, versions, limit):
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""" Called on GET /backfill/<context>/?v=...&limit=...
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Gets hit when we want to backfill backwards on a given context from
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the given point.
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Args:
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context (str): The context to backfill
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versions (list): A list of 2-tuples representing where to backfill
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from, in the form `(pdu_id, origin)`
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limit (int): How many pdus to return.
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Returns:
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Deferred: Results in a tuple in the form of
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`(response_code, respond_body)`, where `response_body` is a python
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dict that will get serialized to JSON.
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On errors, the dict should have an `error` key with a brief message
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of what went wrong.
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"""
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pass
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def on_query_request(self):
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""" Called on a GET /query/<query_type> request. """
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