143 lines
4.5 KiB
Go
143 lines
4.5 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/internal/sqlutil"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/util"
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)
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const stateDataSchema = `
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CREATE TABLE IF NOT EXISTS roomserver_state_block (
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-- The state snapshot NID that identifies this snapshot.
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state_block_nid INTEGER PRIMARY KEY AUTOINCREMENT,
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-- The hash of the state block, which is used to enforce uniqueness. The hash is
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-- generated in Dendrite and passed through to the database, as a btree index over
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-- this column is cheap and fits within the maximum index size.
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state_block_hash BLOB UNIQUE,
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-- The event NIDs contained within the state block, encoded as JSON.
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event_nids TEXT NOT NULL DEFAULT '[]'
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);
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`
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// Insert a new state block. If we conflict on the hash column then
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// we must perform an update so that the RETURNING statement returns the
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// ID of the row that we conflicted with, so that we can then refer to
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// the original block.
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const insertStateDataSQL = `
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INSERT INTO roomserver_state_block (state_block_hash, event_nids)
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VALUES ($1, $2)
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ON CONFLICT (state_block_hash) DO UPDATE SET event_nids=$2
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RETURNING state_block_nid
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`
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const bulkSelectStateBlockEntriesSQL = "" +
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"SELECT state_block_nid, event_nids" +
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" FROM roomserver_state_block WHERE state_block_nid IN ($1) ORDER BY state_block_nid ASC"
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type stateBlockStatements struct {
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db *sql.DB
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insertStateDataStmt *sql.Stmt
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bulkSelectStateBlockEntriesStmt *sql.Stmt
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}
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func CreateStateBlockTable(db *sql.DB) error {
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_, err := db.Exec(stateDataSchema)
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return err
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}
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func PrepareStateBlockTable(db *sql.DB) (*stateBlockStatements, error) {
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s := &stateBlockStatements{
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db: db,
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}
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return s, sqlutil.StatementList{
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{&s.insertStateDataStmt, insertStateDataSQL},
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{&s.bulkSelectStateBlockEntriesStmt, bulkSelectStateBlockEntriesSQL},
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}.Prepare(db)
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}
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func (s *stateBlockStatements) BulkInsertStateData(
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ctx context.Context, txn *sql.Tx,
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entries types.StateEntries,
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) (id types.StateBlockNID, err error) {
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entries = entries[:util.SortAndUnique(entries)]
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nids := make(types.EventNIDs, entries.Len())
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for i := range entries {
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nids[i] = entries[i].EventNID
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}
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js, err := json.Marshal(nids)
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if err != nil {
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return 0, fmt.Errorf("json.Marshal: %w", err)
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}
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stmt := sqlutil.TxStmt(txn, s.insertStateDataStmt)
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err = stmt.QueryRowContext(
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ctx, nids.Hash(), js,
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).Scan(&id)
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return
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}
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func (s *stateBlockStatements) BulkSelectStateBlockEntries(
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ctx context.Context, txn *sql.Tx, stateBlockNIDs types.StateBlockNIDs,
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) ([][]types.EventNID, error) {
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intfs := make([]interface{}, len(stateBlockNIDs))
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for i := range stateBlockNIDs {
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intfs[i] = int64(stateBlockNIDs[i])
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}
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selectOrig := strings.Replace(bulkSelectStateBlockEntriesSQL, "($1)", sqlutil.QueryVariadic(len(intfs)), 1)
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selectPrep, 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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defer selectPrep.Close() // nolint:errcheck
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selectStmt := sqlutil.TxStmt(txn, selectPrep)
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rows, err := selectStmt.QueryContext(ctx, intfs...)
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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, "bulkSelectStateBlockEntries: rows.close() failed")
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results := make([][]types.EventNID, len(stateBlockNIDs))
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i := 0
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var stateBlockNID types.StateBlockNID
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var result json.RawMessage
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for ; rows.Next(); i++ {
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if err = rows.Scan(&stateBlockNID, &result); err != nil {
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return nil, err
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}
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var r []types.EventNID
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if err = json.Unmarshal(result, &r); err != nil {
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return nil, fmt.Errorf("json.Unmarshal: %w", err)
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}
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results[i] = r
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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if i != len(stateBlockNIDs) {
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return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", len(results), len(stateBlockNIDs))
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}
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return results, err
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}
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