mirror of
https://github.com/1f349/dendrite.git
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111 lines
3.6 KiB
Go
111 lines
3.6 KiB
Go
// Copyright 2021 The Matrix.org Foundation C.I.C.
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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 postgres
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import (
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"context"
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"database/sql"
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"fmt"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/syncapi/storage/tables"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/matrix-org/gomatrixserverlib"
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)
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// The memberships table is designed to track the last time that
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// the user was a given state. This allows us to find out the
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// most recent time that a user was invited to, joined or left
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// a room, either by choice or otherwise. This is important for
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// building history visibility.
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const membershipsSchema = `
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CREATE TABLE IF NOT EXISTS syncapi_memberships (
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-- The 'room_id' key for the state event.
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room_id TEXT NOT NULL,
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-- The state event ID
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user_id TEXT NOT NULL,
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-- The status of the membership
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membership TEXT NOT NULL,
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-- The event ID that last changed the membership
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event_id TEXT NOT NULL,
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-- The stream position of the change
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stream_pos BIGINT NOT NULL,
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-- The topological position of the change in the room
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topological_pos BIGINT NOT NULL,
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-- Unique index
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CONSTRAINT syncapi_memberships_unique UNIQUE (room_id, user_id, membership)
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);
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`
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const upsertMembershipSQL = "" +
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"INSERT INTO syncapi_memberships (room_id, user_id, membership, event_id, stream_pos, topological_pos)" +
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" VALUES ($1, $2, $3, $4, $5, $6)" +
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" ON CONFLICT ON CONSTRAINT syncapi_memberships_unique" +
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" DO UPDATE SET event_id = $4, stream_pos = $5, topological_pos = $6"
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const selectMembershipCountSQL = "" +
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"SELECT COUNT(*) FROM (" +
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" SELECT DISTINCT ON (room_id, user_id) room_id, user_id, membership FROM syncapi_memberships WHERE room_id = $1 AND stream_pos <= $2 ORDER BY room_id, user_id, stream_pos DESC" +
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") t WHERE t.membership = $3"
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type membershipsStatements struct {
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upsertMembershipStmt *sql.Stmt
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selectMembershipCountStmt *sql.Stmt
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}
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func NewPostgresMembershipsTable(db *sql.DB) (tables.Memberships, error) {
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s := &membershipsStatements{}
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_, err := db.Exec(membershipsSchema)
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if err != nil {
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return nil, err
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}
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if s.upsertMembershipStmt, err = db.Prepare(upsertMembershipSQL); err != nil {
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return nil, err
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}
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if s.selectMembershipCountStmt, err = db.Prepare(selectMembershipCountSQL); err != nil {
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return nil, err
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}
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return s, nil
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}
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func (s *membershipsStatements) UpsertMembership(
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ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent,
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streamPos, topologicalPos types.StreamPosition,
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) error {
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membership, err := event.Membership()
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if err != nil {
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return fmt.Errorf("event.Membership: %w", err)
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}
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_, err = sqlutil.TxStmt(txn, s.upsertMembershipStmt).ExecContext(
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ctx,
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event.RoomID(),
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*event.StateKey(),
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membership,
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event.EventID(),
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streamPos,
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topologicalPos,
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)
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return err
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}
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func (s *membershipsStatements) SelectMembershipCount(
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ctx context.Context, txn *sql.Tx, roomID, membership string, pos types.StreamPosition,
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) (count int, err error) {
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stmt := sqlutil.TxStmt(txn, s.selectMembershipCountStmt)
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err = stmt.QueryRowContext(ctx, roomID, pos, membership).Scan(&count)
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return
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}
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