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// Copyright 2017 Vector Creations Ltd
// Copyright 2018 New Vector Ltd
// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
//
// 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 state
import (
"context"
"errors"
"github.com/matrix-org/dendrite/roomserver/state/database"
v1 "github.com/matrix-org/dendrite/roomserver/state/v1"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
)
type StateResolutionVersion int
const (
StateResolutionAlgorithmV1 StateResolutionVersion = iota + 1
StateResolutionAlgorithmV2
)
func GetStateResolutionAlgorithm(
version StateResolutionVersion, db database.RoomStateDatabase,
) (StateResolutionImpl, error) {
switch version {
case StateResolutionAlgorithmV1:
return v1.Prepare(db), nil
default:
return nil, errors.New("unsupported room version")
}
}
type StateResolutionImpl interface {
LoadStateAtSnapshot(
ctx context.Context, stateNID types.StateSnapshotNID,
) ([]types.StateEntry, error)
LoadStateAtEvent(
ctx context.Context, eventID string,
) ([]types.StateEntry, error)
LoadCombinedStateAfterEvents(
ctx context.Context, prevStates []types.StateAtEvent,
) ([]types.StateEntry, error)
DifferenceBetweeenStateSnapshots(
ctx context.Context, oldStateNID, newStateNID types.StateSnapshotNID,
) (removed, added []types.StateEntry, err error)
LoadStateAtSnapshotForStringTuples(
ctx context.Context,
stateNID types.StateSnapshotNID,
stateKeyTuples []gomatrixserverlib.StateKeyTuple,
) ([]types.StateEntry, error)
LoadStateAfterEventsForStringTuples(
ctx context.Context,
prevStates []types.StateAtEvent,
stateKeyTuples []gomatrixserverlib.StateKeyTuple,
) ([]types.StateEntry, error)
CalculateAndStoreStateBeforeEvent(
ctx context.Context,
event gomatrixserverlib.Event,
roomNID types.RoomNID,
) (types.StateSnapshotNID, error)
CalculateAndStoreStateAfterEvents(
ctx context.Context,
roomNID types.RoomNID,
prevStates []types.StateAtEvent,
) (types.StateSnapshotNID, error)
}
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