122 lines
3.7 KiB
Go
122 lines
3.7 KiB
Go
// Copyright 2017-2018 New Vector Ltd
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// Copyright 2019-2020 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 sqlite3
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import (
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"context"
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"database/sql"
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"encoding/json"
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"fmt"
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"strings"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/roomserver/storage/tables"
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"github.com/matrix-org/dendrite/roomserver/types"
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)
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const stateSnapshotSchema = `
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CREATE TABLE IF NOT EXISTS roomserver_state_snapshots (
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state_snapshot_nid INTEGER PRIMARY KEY AUTOINCREMENT,
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room_nid INTEGER NOT NULL,
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state_block_nids TEXT NOT NULL DEFAULT '[]'
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);
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`
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const insertStateSQL = `
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INSERT INTO roomserver_state_snapshots (room_nid, state_block_nids)
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VALUES ($1, $2);`
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// Bulk state data NID lookup.
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// Sorting by state_snapshot_nid means we can use binary search over the result
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// to lookup the state data NIDs for a state snapshot NID.
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const bulkSelectStateBlockNIDsSQL = "" +
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"SELECT state_snapshot_nid, state_block_nids FROM roomserver_state_snapshots" +
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" WHERE state_snapshot_nid IN ($1) ORDER BY state_snapshot_nid ASC"
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type stateSnapshotStatements struct {
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db *sql.DB
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insertStateStmt *sql.Stmt
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bulkSelectStateBlockNIDsStmt *sql.Stmt
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}
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func NewSqliteStateSnapshotTable(db *sql.DB) (tables.StateSnapshot, error) {
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s := &stateSnapshotStatements{}
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s.db = db
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_, err := db.Exec(stateSnapshotSchema)
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if err != nil {
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return nil, err
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}
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return s, statementList{
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{&s.insertStateStmt, insertStateSQL},
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{&s.bulkSelectStateBlockNIDsStmt, bulkSelectStateBlockNIDsSQL},
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}.prepare(db)
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}
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func (s *stateSnapshotStatements) InsertState(
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ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID,
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) (stateNID types.StateSnapshotNID, err error) {
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stateBlockNIDsJSON, err := json.Marshal(stateBlockNIDs)
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if err != nil {
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return
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}
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insertStmt := txn.Stmt(s.insertStateStmt)
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if res, err2 := insertStmt.ExecContext(ctx, int64(roomNID), string(stateBlockNIDsJSON)); err2 == nil {
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lastRowID, err3 := res.LastInsertId()
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if err3 != nil {
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err = err3
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}
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stateNID = types.StateSnapshotNID(lastRowID)
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}
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return
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}
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func (s *stateSnapshotStatements) BulkSelectStateBlockNIDs(
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ctx context.Context, stateNIDs []types.StateSnapshotNID,
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) ([]types.StateBlockNIDList, error) {
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nids := make([]interface{}, len(stateNIDs))
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for k, v := range stateNIDs {
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nids[k] = v
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}
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selectOrig := strings.Replace(bulkSelectStateBlockNIDsSQL, "($1)", internal.QueryVariadic(len(nids)), 1)
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selectStmt, err := s.db.Prepare(selectOrig)
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if err != nil {
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return nil, err
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}
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rows, err := selectStmt.QueryContext(ctx, nids...)
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if err != nil {
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return nil, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockNIDs: rows.close() failed")
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results := make([]types.StateBlockNIDList, len(stateNIDs))
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i := 0
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for ; rows.Next(); i++ {
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result := &results[i]
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var stateBlockNIDsJSON string
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if err := rows.Scan(&result.StateSnapshotNID, &stateBlockNIDsJSON); err != nil {
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return nil, err
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}
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if err := json.Unmarshal([]byte(stateBlockNIDsJSON), &result.StateBlockNIDs); err != nil {
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return nil, err
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}
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}
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if i != len(stateNIDs) {
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return nil, fmt.Errorf("storage: state NIDs missing from the database (%d != %d)", i, len(stateNIDs))
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}
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return results, nil
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}
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