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