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// Copyright 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 sqlite3
import (
"context"
"database/sql"
"math"
"github.com/Shopify/sarama"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/keyserver/storage/tables"
)
var keyChangesSchema = `
-- Stores key change information about users. Used to determine when to send updated device lists to clients.
CREATE TABLE IF NOT EXISTS keyserver_key_changes (
partition BIGINT NOT NULL,
offset BIGINT NOT NULL,
-- The key owner
user_id TEXT NOT NULL,
UNIQUE (partition, offset)
);
`
// Replace based on partition|offset - we should never insert duplicates unless the kafka logs are wiped.
// Rather than falling over, just overwrite (though this will mean clients with an existing sync token will
// miss out on updates). TODO: Ideally we would detect when kafka logs are purged then purge this table too.
const upsertKeyChangeSQL = "" +
"INSERT INTO keyserver_key_changes (partition, offset, user_id)" +
" VALUES ($1, $2, $3)" +
" ON CONFLICT (partition, offset)" +
" DO UPDATE SET user_id = $3"
// select the highest offset for each user in the range. The grouping by user gives distinct entries and then we just
// take the max offset value as the latest offset.
const selectKeyChangesSQL = "" +
"SELECT user_id, MAX(offset) FROM keyserver_key_changes WHERE partition = $1 AND offset > $2 AND offset <= $3 GROUP BY user_id"
type keyChangesStatements struct {
db *sql.DB
upsertKeyChangeStmt *sql.Stmt
selectKeyChangesStmt *sql.Stmt
}
func NewSqliteKeyChangesTable(db *sql.DB) (tables.KeyChanges, error) {
s := &keyChangesStatements{
db: db,
}
_, err := db.Exec(keyChangesSchema)
if err != nil {
return nil, err
}
if s.upsertKeyChangeStmt, err = db.Prepare(upsertKeyChangeSQL); err != nil {
return nil, err
}
if s.selectKeyChangesStmt, err = db.Prepare(selectKeyChangesSQL); err != nil {
return nil, err
}
return s, nil
}
func (s *keyChangesStatements) InsertKeyChange(ctx context.Context, partition int32, offset int64, userID string) error {
_, err := s.upsertKeyChangeStmt.ExecContext(ctx, partition, offset, userID)
return err
}
func (s *keyChangesStatements) SelectKeyChanges(
ctx context.Context, partition int32, fromOffset, toOffset int64,
) (userIDs []string, latestOffset int64, err error) {
if toOffset == sarama.OffsetNewest {
toOffset = math.MaxInt64
}
rows, err := s.selectKeyChangesStmt.QueryContext(ctx, partition, fromOffset, toOffset)
if err != nil {
return nil, 0, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectKeyChangesStmt: rows.close() failed")
for rows.Next() {
var userID string
var offset int64
if err := rows.Scan(&userID, &offset); err != nil {
return nil, 0, err
}
if offset > latestOffset {
latestOffset = offset
}
userIDs = append(userIDs, userID)
}
return
}
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