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// 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 (
"encoding/json"
"net/http"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib/fclient"
"github.com/matrix-org/util"
)
type getMissingEventRequest struct {
EarliestEvents []string `json:"earliest_events"`
LatestEvents []string `json:"latest_events"`
Limit int `json:"limit"`
MinDepth int64 `json:"min_depth"` // not used
}
// GetMissingEvents returns missing events between earliest_events & latest_events.
// Events are fetched from room DAG starting from latest_events until we reach earliest_events or the limit.
func GetMissingEvents(
httpReq *http.Request,
request *fclient.FederationRequest,
rsAPI api.FederationRoomserverAPI,
roomID string,
) util.JSONResponse {
var gme getMissingEventRequest
if err := json.Unmarshal(request.Content(), &gme); err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.NotJSON("The request body could not be decoded into valid JSON. " + err.Error()),
}
}
// If we don't think we belong to this room then don't waste the effort
// responding to expensive requests for it.
if err := ErrorIfLocalServerNotInRoom(httpReq.Context(), rsAPI, roomID); err != nil {
return *err
}
var eventsResponse api.QueryMissingEventsResponse
if err := rsAPI.QueryMissingEvents(
httpReq.Context(), &api.QueryMissingEventsRequest{
EarliestEvents: gme.EarliestEvents,
LatestEvents: gme.LatestEvents,
Limit: gme.Limit,
ServerName: request.Origin(),
},
&eventsResponse,
); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("query.QueryMissingEvents failed")
return jsonerror.InternalServerError()
}
eventsResponse.Events = filterEvents(eventsResponse.Events, roomID)
resp := fclient.RespMissingEvents{
Events: types.NewEventJSONsFromHeaderedEvents(eventsResponse.Events),
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: resp,
}
}
// filterEvents returns only those events with matching roomID
func filterEvents(
events []*types.HeaderedEvent, roomID string,
) []*types.HeaderedEvent {
ref := events[:0]
for _, ev := range events {
if ev.RoomID() == roomID {
ref = append(ref, ev)
}
}
return ref
}
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