104 lines
3.4 KiB
Go
104 lines
3.4 KiB
Go
// Copyright 2020 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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"math"
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"github.com/Shopify/sarama"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/keyserver/storage/tables"
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)
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var keyChangesSchema = `
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-- Stores key change information about users. Used to determine when to send updated device lists to clients.
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CREATE TABLE IF NOT EXISTS keyserver_key_changes (
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partition BIGINT NOT NULL,
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log_offset BIGINT NOT NULL,
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user_id TEXT NOT NULL,
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CONSTRAINT keyserver_key_changes_unique UNIQUE (partition, log_offset)
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);
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`
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// Replace based on partition|offset - we should never insert duplicates unless the kafka logs are wiped.
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// Rather than falling over, just overwrite (though this will mean clients with an existing sync token will
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// miss out on updates). TODO: Ideally we would detect when kafka logs are purged then purge this table too.
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const upsertKeyChangeSQL = "" +
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"INSERT INTO keyserver_key_changes (partition, log_offset, user_id)" +
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" VALUES ($1, $2, $3)" +
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" ON CONFLICT ON CONSTRAINT keyserver_key_changes_unique" +
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" DO UPDATE SET user_id = $3"
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// select the highest offset for each user in the range. The grouping by user gives distinct entries and then we just
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// take the max offset value as the latest offset.
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const selectKeyChangesSQL = "" +
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"SELECT user_id, MAX(log_offset) FROM keyserver_key_changes WHERE partition = $1 AND log_offset > $2 AND log_offset <= $3 GROUP BY user_id"
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type keyChangesStatements struct {
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db *sql.DB
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upsertKeyChangeStmt *sql.Stmt
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selectKeyChangesStmt *sql.Stmt
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}
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func NewPostgresKeyChangesTable(db *sql.DB) (tables.KeyChanges, error) {
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s := &keyChangesStatements{
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db: db,
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}
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_, err := db.Exec(keyChangesSchema)
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if err != nil {
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return nil, err
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}
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if s.upsertKeyChangeStmt, err = db.Prepare(upsertKeyChangeSQL); err != nil {
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return nil, err
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}
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if s.selectKeyChangesStmt, err = db.Prepare(selectKeyChangesSQL); 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 *keyChangesStatements) InsertKeyChange(ctx context.Context, partition int32, offset int64, userID string) error {
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_, err := s.upsertKeyChangeStmt.ExecContext(ctx, partition, offset, userID)
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return err
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}
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func (s *keyChangesStatements) SelectKeyChanges(
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ctx context.Context, partition int32, fromOffset, toOffset int64,
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) (userIDs []string, latestOffset int64, err error) {
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if toOffset == sarama.OffsetNewest {
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toOffset = math.MaxInt64
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}
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latestOffset = fromOffset
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rows, err := s.selectKeyChangesStmt.QueryContext(ctx, partition, fromOffset, toOffset)
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if err != nil {
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return nil, 0, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectKeyChangesStmt: rows.close() failed")
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for rows.Next() {
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var userID string
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var offset int64
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if err := rows.Scan(&userID, &offset); err != nil {
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return nil, 0, err
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}
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if offset > latestOffset {
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latestOffset = offset
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}
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userIDs = append(userIDs, userID)
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}
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return
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}
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