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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"
"strings"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
"github.com/matrix-org/dendrite/roomserver/types"
)
const eventJSONSchema = `
CREATE TABLE IF NOT EXISTS roomserver_event_json (
event_nid INTEGER NOT NULL PRIMARY KEY,
event_json TEXT NOT NULL
);
`
const insertEventJSONSQL = `
INSERT OR REPLACE INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)
`
// Bulk event JSON lookup by numeric event ID.
// Sort by the numeric event ID.
// This means that we can use binary search to lookup by numeric event ID.
const bulkSelectEventJSONSQL = `
SELECT event_nid, event_json FROM roomserver_event_json
WHERE event_nid IN ($1)
ORDER BY event_nid ASC
`
type eventJSONStatements struct {
db *sql.DB
insertEventJSONStmt *sql.Stmt
bulkSelectEventJSONStmt *sql.Stmt
}
func CreateEventJSONTable(db *sql.DB) error {
_, err := db.Exec(eventJSONSchema)
return err
}
func PrepareEventJSONTable(db *sql.DB) (tables.EventJSON, error) {
s := &eventJSONStatements{
db: db,
}
return s, sqlutil.StatementList{
{&s.insertEventJSONStmt, insertEventJSONSQL},
{&s.bulkSelectEventJSONStmt, bulkSelectEventJSONSQL},
}.Prepare(db)
}
func (s *eventJSONStatements) InsertEventJSON(
ctx context.Context, txn *sql.Tx, eventNID types.EventNID, eventJSON []byte,
) error {
_, err := sqlutil.TxStmt(txn, s.insertEventJSONStmt).ExecContext(ctx, int64(eventNID), eventJSON)
return err
}
func (s *eventJSONStatements) BulkSelectEventJSON(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
) ([]tables.EventJSONPair, error) {
iEventNIDs := make([]interface{}, len(eventNIDs))
for k, v := range eventNIDs {
iEventNIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectEventJSONSQL, "($1)", sqlutil.QueryVariadic(len(iEventNIDs)), 1)
var rows *sql.Rows
var err error
if txn != nil {
rows, err = txn.QueryContext(ctx, selectOrig, iEventNIDs...)
} else {
rows, err = s.db.QueryContext(ctx, selectOrig, iEventNIDs...)
}
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventJSON: rows.close() failed")
// We know that we will only get as many results as event NIDs
// because of the unique constraint on event NIDs.
// So we can allocate an array of the correct size now.
// We might get fewer results than NIDs so we adjust the length of the slice before returning it.
results := make([]tables.EventJSONPair, len(eventNIDs))
i := 0
var eventNID int64
for ; rows.Next(); i++ {
result := &results[i]
if err := rows.Scan(&eventNID, &result.EventJSON); err != nil {
return nil, err
}
result.EventNID = types.EventNID(eventNID)
}
return results[:i], nil
}
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