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// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package routing
import (
"context"
"encoding/json"
"net/http"
"sync"
"time"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/util"
"github.com/matrix-org/dendrite/federationapi/producers"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/setup/config"
userAPI "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib/spec"
)
const (
// Event was passed to the roomserver
MetricsOutcomeOK = "ok"
// Event failed to be processed
MetricsOutcomeFail = "fail"
// Event failed auth checks
MetricsOutcomeRejected = "rejected"
// Terminated the transaction
MetricsOutcomeFatal = "fatal"
// The event has missing auth_events we need to fetch
MetricsWorkMissingAuthEvents = "missing_auth_events"
// No work had to be done as we had all prev/auth events
MetricsWorkDirect = "direct"
// The event has missing prev_events we need to call /g_m_e for
MetricsWorkMissingPrevEvents = "missing_prev_events"
)
var inFlightTxnsPerOrigin sync.Map // transaction ID -> chan util.JSONResponse
// Send implements /_matrix/federation/v1/send/{txnID}
func Send(
httpReq *http.Request,
request *fclient.FederationRequest,
txnID gomatrixserverlib.TransactionID,
cfg *config.FederationAPI,
rsAPI api.FederationRoomserverAPI,
keyAPI userAPI.FederationUserAPI,
keys gomatrixserverlib.JSONVerifier,
federation fclient.FederationClient,
mu *internal.MutexByRoom,
producer *producers.SyncAPIProducer,
) util.JSONResponse {
// First we should check if this origin has already submitted this
// txn ID to us. If they have and the txnIDs map contains an entry,
// the transaction is still being worked on. The new client can wait
// for it to complete rather than creating more work.
index := string(request.Origin()) + "\000" + string(txnID)
v, ok := inFlightTxnsPerOrigin.LoadOrStore(index, make(chan util.JSONResponse, 1))
ch := v.(chan util.JSONResponse)
if ok {
// This origin already submitted this txn ID to us, and the work
// is still taking place, so we'll just wait for it to finish.
ctx, cancel := context.WithTimeout(httpReq.Context(), time.Minute*5)
defer cancel()
select {
case <-ctx.Done():
// If the caller gives up then return straight away. We don't
// want to attempt to process what they sent us any further.
return util.JSONResponse{Code: http.StatusRequestTimeout}
case res := <-ch:
// The original task just finished processing so let's return
// the result of it.
if res.Code == 0 {
return util.JSONResponse{Code: http.StatusAccepted}
}
return res
}
}
// Otherwise, store that we're currently working on this txn from
// this origin. When we're done processing, close the channel.
defer close(ch)
defer inFlightTxnsPerOrigin.Delete(index)
var txnEvents struct {
PDUs []json.RawMessage `json:"pdus"`
EDUs []gomatrixserverlib.EDU `json:"edus"`
}
if err := json.Unmarshal(request.Content(), &txnEvents); err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.NotJSON("The request body could not be decoded into valid JSON. " + err.Error()),
}
}
// Transactions are limited in size; they can have at most 50 PDUs and 100 EDUs.
// https://matrix.org/docs/spec/server_server/latest#transactions
if len(txnEvents.PDUs) > 50 || len(txnEvents.EDUs) > 100 {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.BadJSON("max 50 pdus / 100 edus"),
}
}
t := internal.NewTxnReq(
rsAPI,
keyAPI,
cfg.Matrix.ServerName,
keys,
mu,
producer,
cfg.Matrix.Presence.EnableInbound,
txnEvents.PDUs,
txnEvents.EDUs,
request.Origin(),
txnID,
cfg.Matrix.ServerName)
util.GetLogger(httpReq.Context()).Debugf("Received transaction %q from %q containing %d PDUs, %d EDUs", txnID, request.Origin(), len(t.PDUs), len(t.EDUs))
resp, jsonErr := t.ProcessTransaction(httpReq.Context())
if jsonErr != nil {
util.GetLogger(httpReq.Context()).WithField("jsonErr", jsonErr).Error("t.processTransaction failed")
return *jsonErr
}
// https://matrix.org/docs/spec/server_server/r0.1.3#put-matrix-federation-v1-send-txnid
// Status code 200:
// The result of processing the transaction. The server is to use this response
// even in the event of one or more PDUs failing to be processed.
res := util.JSONResponse{
Code: http.StatusOK,
JSON: resp,
}
ch <- res
return res
}
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