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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 postgres
import (
"context"
"database/sql"
"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 = `
-- Stores the JSON for each event. This kept separate from the main events
-- table to keep the rows in the main events table small.
CREATE TABLE IF NOT EXISTS roomserver_event_json (
-- Local numeric ID for the event.
event_nid BIGINT NOT NULL PRIMARY KEY,
-- The JSON for the event.
-- Stored as TEXT because this should be valid UTF-8.
-- Not stored as a JSONB because we always just pull the entire event
-- so there is no point in postgres parsing it.
-- Not stored as JSON because we already validate the JSON in the server
-- so there is no point in postgres validating it.
-- TODO: Should we be compressing the events with Snappy or DEFLATE?
event_json TEXT NOT NULL
);
`
const insertEventJSONSQL = "" +
"INSERT INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)" +
" ON CONFLICT (event_nid) DO UPDATE SET event_json=$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 = ANY($1)" +
" ORDER BY event_nid ASC"
type eventJSONStatements struct {
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{}
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 {
stmt := sqlutil.TxStmt(txn, s.insertEventJSONStmt)
_, err := stmt.ExecContext(ctx, int64(eventNID), eventJSON)
return err
}
func (s *eventJSONStatements) BulkSelectEventJSON(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
) ([]tables.EventJSONPair, error) {
stmt := sqlutil.TxStmt(txn, s.bulkSelectEventJSONStmt)
rows, err := stmt.QueryContext(ctx, eventNIDsAsArray(eventNIDs))
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
for ; rows.Next(); i++ {
result := &results[i]
var eventNID int64
if err := rows.Scan(&eventNID, &result.EventJSON); err != nil {
return nil, err
}
result.EventNID = types.EventNID(eventNID)
}
return results[:i], rows.Err()
}
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