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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/lib/pq"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/roomserver/types"
)
const eventStateKeysSchema = `
-- Numeric versions of the event "state_key"s. State keys tend to be reused so
-- assigning each string a numeric ID should reduce the amount of data that
-- needs to be stored and fetched from the database.
-- It also means that many operations can work with int64 arrays rather than
-- string arrays which may help reduce GC pressure.
-- Well known state keys are pre-assigned numeric IDs:
-- 1 -> "" (the empty string)
-- Other state keys are automatically assigned numeric IDs starting from 2**16.
-- This leaves room to add more pre-assigned numeric IDs and clearly separates
-- the automatically assigned IDs from the pre-assigned IDs.
CREATE SEQUENCE IF NOT EXISTS roomserver_event_state_key_nid_seq START 65536;
CREATE TABLE IF NOT EXISTS roomserver_event_state_keys (
-- Local numeric ID for the state key.
event_state_key_nid BIGINT PRIMARY KEY DEFAULT nextval('roomserver_event_state_key_nid_seq'),
event_state_key TEXT NOT NULL CONSTRAINT roomserver_event_state_key_unique UNIQUE
);
INSERT INTO roomserver_event_state_keys (event_state_key_nid, event_state_key) VALUES
(1, '') ON CONFLICT DO NOTHING;
`
// Same as insertEventTypeNIDSQL
const insertEventStateKeyNIDSQL = "" +
"INSERT INTO roomserver_event_state_keys (event_state_key) VALUES ($1)" +
" ON CONFLICT ON CONSTRAINT roomserver_event_state_key_unique" +
" DO NOTHING RETURNING (event_state_key_nid)"
const selectEventStateKeyNIDSQL = "" +
"SELECT event_state_key_nid FROM roomserver_event_state_keys" +
" WHERE event_state_key = $1"
// Bulk lookup from string state key to numeric ID for that state key.
// Takes an array of strings as the query parameter.
const bulkSelectEventStateKeyNIDSQL = "" +
"SELECT event_state_key, event_state_key_nid FROM roomserver_event_state_keys" +
" WHERE event_state_key = ANY($1)"
// Bulk lookup from numeric ID to string state key for that state key.
// Takes an array of strings as the query parameter.
const bulkSelectEventStateKeySQL = "" +
"SELECT event_state_key, event_state_key_nid FROM roomserver_event_state_keys" +
" WHERE event_state_key_nid = ANY($1)"
type eventStateKeyStatements struct {
insertEventStateKeyNIDStmt *sql.Stmt
selectEventStateKeyNIDStmt *sql.Stmt
bulkSelectEventStateKeyNIDStmt *sql.Stmt
bulkSelectEventStateKeyStmt *sql.Stmt
}
func (s *eventStateKeyStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(eventStateKeysSchema)
if err != nil {
return
}
return statementList{
{&s.insertEventStateKeyNIDStmt, insertEventStateKeyNIDSQL},
{&s.selectEventStateKeyNIDStmt, selectEventStateKeyNIDSQL},
{&s.bulkSelectEventStateKeyNIDStmt, bulkSelectEventStateKeyNIDSQL},
{&s.bulkSelectEventStateKeyStmt, bulkSelectEventStateKeySQL},
}.prepare(db)
}
func (s *eventStateKeyStatements) insertEventStateKeyNID(
ctx context.Context, txn *sql.Tx, eventStateKey string,
) (types.EventStateKeyNID, error) {
var eventStateKeyNID int64
stmt := internal.TxStmt(txn, s.insertEventStateKeyNIDStmt)
err := stmt.QueryRowContext(ctx, eventStateKey).Scan(&eventStateKeyNID)
return types.EventStateKeyNID(eventStateKeyNID), err
}
func (s *eventStateKeyStatements) selectEventStateKeyNID(
ctx context.Context, txn *sql.Tx, eventStateKey string,
) (types.EventStateKeyNID, error) {
var eventStateKeyNID int64
stmt := internal.TxStmt(txn, s.selectEventStateKeyNIDStmt)
err := stmt.QueryRowContext(ctx, eventStateKey).Scan(&eventStateKeyNID)
return types.EventStateKeyNID(eventStateKeyNID), err
}
func (s *eventStateKeyStatements) bulkSelectEventStateKeyNID(
ctx context.Context, eventStateKeys []string,
) (map[string]types.EventStateKeyNID, error) {
rows, err := s.bulkSelectEventStateKeyNIDStmt.QueryContext(
ctx, pq.StringArray(eventStateKeys),
)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventStateKeyNID: rows.close() failed")
result := make(map[string]types.EventStateKeyNID, len(eventStateKeys))
for rows.Next() {
var stateKey string
var stateKeyNID int64
if err := rows.Scan(&stateKey, &stateKeyNID); err != nil {
return nil, err
}
result[stateKey] = types.EventStateKeyNID(stateKeyNID)
}
return result, rows.Err()
}
func (s *eventStateKeyStatements) bulkSelectEventStateKey(
ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID,
) (map[types.EventStateKeyNID]string, error) {
nIDs := make(pq.Int64Array, len(eventStateKeyNIDs))
for i := range eventStateKeyNIDs {
nIDs[i] = int64(eventStateKeyNIDs[i])
}
rows, err := s.bulkSelectEventStateKeyStmt.QueryContext(ctx, nIDs)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventStateKey: rows.close() failed")
result := make(map[types.EventStateKeyNID]string, len(eventStateKeyNIDs))
for rows.Next() {
var stateKey string
var stateKeyNID int64
if err := rows.Scan(&stateKey, &stateKeyNID); err != nil {
return nil, err
}
result[types.EventStateKeyNID(stateKeyNID)] = stateKey
}
return result, rows.Err()
}
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