130 lines
4 KiB
Go
130 lines
4 KiB
Go
// Copyright 2020 New Vector 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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package perform
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import (
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"context"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/dendrite/roomserver/internal/input"
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"github.com/matrix-org/dendrite/roomserver/internal/query"
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"github.com/matrix-org/dendrite/roomserver/state"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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)
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type InboundPeeker struct {
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DB storage.RoomDatabase
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Inputer *input.Inputer
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}
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// PerformInboundPeek handles peeking into matrix rooms, including over
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// federation by talking to the federationapi. called when a remote server
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// initiates a /peek over federation.
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//
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// It should atomically figure out the current state of the room (for the
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// response to /peek) while adding the new inbound peek to the kafka stream so the
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// fed sender can start sending peeked events without a race between the state
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// snapshot and the stream of peeked events.
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func (r *InboundPeeker) PerformInboundPeek(
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ctx context.Context,
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request *api.PerformInboundPeekRequest,
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response *api.PerformInboundPeekResponse,
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) error {
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info, err := r.DB.RoomInfo(ctx, request.RoomID)
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if err != nil {
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return err
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}
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if info == nil || info.IsStub() {
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return nil
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}
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response.RoomExists = true
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response.RoomVersion = info.RoomVersion
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var stateEvents []gomatrixserverlib.PDU
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var currentStateSnapshotNID types.StateSnapshotNID
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latestEventRefs, currentStateSnapshotNID, _, err :=
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r.DB.LatestEventIDs(ctx, info.RoomNID)
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if err != nil {
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return err
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}
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latestEvents, err := r.DB.EventsFromIDs(ctx, info, []string{latestEventRefs[0]})
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if err != nil {
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return err
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}
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var sortedLatestEvents []gomatrixserverlib.PDU
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for _, ev := range latestEvents {
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sortedLatestEvents = append(sortedLatestEvents, ev.PDU)
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}
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sortedLatestEvents = gomatrixserverlib.ReverseTopologicalOrdering(
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sortedLatestEvents,
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gomatrixserverlib.TopologicalOrderByPrevEvents,
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)
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response.LatestEvent = &types.HeaderedEvent{PDU: sortedLatestEvents[0]}
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// XXX: do we actually need to do a state resolution here?
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roomState := state.NewStateResolution(r.DB, info, r.Inputer.Queryer)
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var stateEntries []types.StateEntry
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stateEntries, err = roomState.LoadStateAtSnapshot(
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ctx, currentStateSnapshotNID,
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)
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if err != nil {
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return err
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}
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stateEvents, err = helpers.LoadStateEvents(ctx, r.DB, info, stateEntries)
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if err != nil {
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return err
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}
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// get the auth event IDs for the current state events
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var authEventIDs []string
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for _, se := range stateEvents {
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authEventIDs = append(authEventIDs, se.AuthEventIDs()...)
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}
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authEventIDs = util.UniqueStrings(authEventIDs) // de-dupe
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authEvents, err := query.GetAuthChain(ctx, r.DB.EventsFromIDs, info, authEventIDs)
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if err != nil {
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return err
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}
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for _, event := range stateEvents {
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response.StateEvents = append(response.StateEvents, &types.HeaderedEvent{PDU: event})
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}
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for _, event := range authEvents {
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response.AuthChainEvents = append(response.AuthChainEvents, &types.HeaderedEvent{PDU: event})
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}
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err = r.Inputer.OutputProducer.ProduceRoomEvents(request.RoomID, []api.OutputEvent{
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{
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Type: api.OutputTypeNewInboundPeek,
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NewInboundPeek: &api.OutputNewInboundPeek{
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RoomID: request.RoomID,
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PeekID: request.PeekID,
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LatestEventID: latestEvents[0].EventID(),
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ServerName: request.ServerName,
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RenewalInterval: request.RenewalInterval,
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},
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},
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})
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return err
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}
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