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