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