dendrite/roomserver/storage/sqlite3/events_table.go

616 lines
22 KiB
Go

// 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"
"sort"
"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"
"github.com/matrix-org/gomatrixserverlib"
)
const eventsSchema = `
CREATE TABLE IF NOT EXISTS roomserver_events (
event_nid INTEGER PRIMARY KEY AUTOINCREMENT,
room_nid INTEGER NOT NULL,
event_type_nid INTEGER NOT NULL,
event_state_key_nid INTEGER NOT NULL,
sent_to_output BOOLEAN NOT NULL DEFAULT FALSE,
state_snapshot_nid INTEGER NOT NULL DEFAULT 0,
depth INTEGER NOT NULL,
event_id TEXT NOT NULL UNIQUE,
reference_sha256 BLOB NOT NULL,
auth_event_nids TEXT NOT NULL DEFAULT '[]',
is_rejected BOOLEAN NOT NULL DEFAULT FALSE
);
`
const insertEventSQL = `
INSERT INTO roomserver_events (room_nid, event_type_nid, event_state_key_nid, event_id, reference_sha256, auth_event_nids, depth, is_rejected)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
ON CONFLICT DO UPDATE
SET is_rejected = $8 WHERE is_rejected = 0
RETURNING event_nid, state_snapshot_nid;
`
const selectEventSQL = "" +
"SELECT event_nid, state_snapshot_nid FROM roomserver_events WHERE event_id = $1"
// Bulk lookup of events by string ID.
// Sort by the numeric IDs for event type and state key.
// This means we can use binary search to lookup entries by type and state key.
const bulkSelectStateEventByIDSQL = "" +
"SELECT event_type_nid, event_state_key_nid, event_nid FROM roomserver_events" +
" WHERE event_id IN ($1)" +
" ORDER BY event_type_nid, event_state_key_nid ASC"
const bulkSelectStateEventByNIDSQL = "" +
"SELECT event_type_nid, event_state_key_nid, event_nid FROM roomserver_events" +
" WHERE event_nid IN ($1)"
// Rest of query is built by BulkSelectStateEventByNID
const bulkSelectStateAtEventByIDSQL = "" +
"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, is_rejected FROM roomserver_events" +
" WHERE event_id IN ($1)"
const updateEventStateSQL = "" +
"UPDATE roomserver_events SET state_snapshot_nid = $1 WHERE event_nid = $2"
const selectEventSentToOutputSQL = "" +
"SELECT sent_to_output FROM roomserver_events WHERE event_nid = $1"
const updateEventSentToOutputSQL = "" +
"UPDATE roomserver_events SET sent_to_output = TRUE WHERE event_nid = $1"
const selectEventIDSQL = "" +
"SELECT event_id FROM roomserver_events WHERE event_nid = $1"
const bulkSelectStateAtEventAndReferenceSQL = "" +
"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, event_id, reference_sha256" +
" FROM roomserver_events WHERE event_nid IN ($1)"
const bulkSelectEventReferenceSQL = "" +
"SELECT event_id, reference_sha256 FROM roomserver_events WHERE event_nid IN ($1)"
const bulkSelectEventIDSQL = "" +
"SELECT event_nid, event_id FROM roomserver_events WHERE event_nid IN ($1)"
const bulkSelectEventNIDSQL = "" +
"SELECT event_id, event_nid FROM roomserver_events WHERE event_id IN ($1)"
const bulkSelectUnsentEventNIDSQL = "" +
"SELECT event_id, event_nid FROM roomserver_events WHERE sent_to_output = 0 AND event_id IN ($1)"
const selectMaxEventDepthSQL = "" +
"SELECT COALESCE(MAX(depth) + 1, 0) FROM roomserver_events WHERE event_nid IN ($1)"
const selectRoomNIDsForEventNIDsSQL = "" +
"SELECT event_nid, room_nid FROM roomserver_events WHERE event_nid IN ($1)"
type eventStatements struct {
db *sql.DB
insertEventStmt *sql.Stmt
selectEventStmt *sql.Stmt
bulkSelectStateEventByIDStmt *sql.Stmt
bulkSelectStateAtEventByIDStmt *sql.Stmt
updateEventStateStmt *sql.Stmt
selectEventSentToOutputStmt *sql.Stmt
updateEventSentToOutputStmt *sql.Stmt
selectEventIDStmt *sql.Stmt
bulkSelectStateAtEventAndReferenceStmt *sql.Stmt
bulkSelectEventReferenceStmt *sql.Stmt
bulkSelectEventIDStmt *sql.Stmt
//bulkSelectEventNIDStmt *sql.Stmt
//bulkSelectUnsentEventNIDStmt *sql.Stmt
//selectRoomNIDsForEventNIDsStmt *sql.Stmt
}
func createEventsTable(db *sql.DB) error {
_, err := db.Exec(eventsSchema)
return err
}
func prepareEventsTable(db *sql.DB) (tables.Events, error) {
s := &eventStatements{
db: db,
}
return s, sqlutil.StatementList{
{&s.insertEventStmt, insertEventSQL},
{&s.selectEventStmt, selectEventSQL},
{&s.bulkSelectStateEventByIDStmt, bulkSelectStateEventByIDSQL},
{&s.bulkSelectStateAtEventByIDStmt, bulkSelectStateAtEventByIDSQL},
{&s.updateEventStateStmt, updateEventStateSQL},
{&s.updateEventSentToOutputStmt, updateEventSentToOutputSQL},
{&s.selectEventSentToOutputStmt, selectEventSentToOutputSQL},
{&s.selectEventIDStmt, selectEventIDSQL},
{&s.bulkSelectStateAtEventAndReferenceStmt, bulkSelectStateAtEventAndReferenceSQL},
{&s.bulkSelectEventReferenceStmt, bulkSelectEventReferenceSQL},
{&s.bulkSelectEventIDStmt, bulkSelectEventIDSQL},
//{&s.bulkSelectEventNIDStmt, bulkSelectEventNIDSQL},
//{&s.bulkSelectUnsentEventNIDStmt, bulkSelectUnsentEventNIDSQL},
//{&s.selectRoomNIDForEventNIDStmt, selectRoomNIDForEventNIDSQL},
}.Prepare(db)
}
func (s *eventStatements) InsertEvent(
ctx context.Context,
txn *sql.Tx,
roomNID types.RoomNID,
eventTypeNID types.EventTypeNID,
eventStateKeyNID types.EventStateKeyNID,
eventID string,
referenceSHA256 []byte,
authEventNIDs []types.EventNID,
depth int64,
isRejected bool,
) (types.EventNID, types.StateSnapshotNID, error) {
// attempt to insert: the last_row_id is the event NID
var eventNID int64
var stateNID int64
insertStmt := sqlutil.TxStmt(txn, s.insertEventStmt)
err := insertStmt.QueryRowContext(
ctx, int64(roomNID), int64(eventTypeNID), int64(eventStateKeyNID),
eventID, referenceSHA256, eventNIDsAsArray(authEventNIDs), depth, isRejected,
).Scan(&eventNID, &stateNID)
return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
}
func (s *eventStatements) SelectEvent(
ctx context.Context, txn *sql.Tx, eventID string,
) (types.EventNID, types.StateSnapshotNID, error) {
var eventNID int64
var stateNID int64
selectStmt := sqlutil.TxStmt(txn, s.selectEventStmt)
err := selectStmt.QueryRowContext(ctx, eventID).Scan(&eventNID, &stateNID)
return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
}
// bulkSelectStateEventByID lookups a list of state events by event ID.
// If any of the requested events are missing from the database it returns a types.MissingEventError
func (s *eventStatements) BulkSelectStateEventByID(
ctx context.Context, txn *sql.Tx, eventIDs []string,
) ([]types.StateEntry, error) {
///////////////
iEventIDs := make([]interface{}, len(eventIDs))
for k, v := range eventIDs {
iEventIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectStateEventByIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
///////////////
rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateEventByID: rows.close() failed")
// We know that we will only get as many results as event IDs
// because of the unique constraint on event IDs.
// So we can allocate an array of the correct size now.
// We might get fewer results than IDs so we adjust the length of the slice before returning it.
results := make([]types.StateEntry, len(eventIDs))
i := 0
for ; rows.Next(); i++ {
result := &results[i]
if err = rows.Scan(
&result.EventTypeNID,
&result.EventStateKeyNID,
&result.EventNID,
); err != nil {
return nil, err
}
}
if i != len(eventIDs) {
// If there are fewer rows returned than IDs then we were asked to lookup event IDs we don't have.
// We don't know which ones were missing because we don't return the string IDs in the query.
// However it should be possible debug this by replaying queries or entries from the input kafka logs.
// If this turns out to be impossible and we do need the debug information here, it would be better
// to do it as a separate query rather than slowing down/complicating the internal case.
return nil, types.MissingEventError(
fmt.Sprintf("storage: state event IDs missing from the database (%d != %d)", i, len(eventIDs)),
)
}
return results, err
}
// bulkSelectStateEventByID lookups a list of state events by event ID.
// If any of the requested events are missing from the database it returns a types.MissingEventError
func (s *eventStatements) BulkSelectStateEventByNID(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
stateKeyTuples []types.StateKeyTuple,
) ([]types.StateEntry, error) {
tuples := stateKeyTupleSorter(stateKeyTuples)
sort.Sort(tuples)
eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays()
params := make([]interface{}, 0, len(eventNIDs)+len(eventTypeNIDArray)+len(eventStateKeyNIDArray))
selectOrig := strings.Replace(bulkSelectStateEventByNIDSQL, "($1)", sqlutil.QueryVariadic(len(eventNIDs)), 1)
for _, v := range eventNIDs {
params = append(params, v)
}
if len(eventTypeNIDArray) > 0 {
selectOrig += " AND event_type_nid IN " + sqlutil.QueryVariadicOffset(len(eventTypeNIDArray), len(params))
for _, v := range eventTypeNIDArray {
params = append(params, v)
}
}
if len(eventStateKeyNIDArray) > 0 {
selectOrig += " AND event_state_key_nid IN " + sqlutil.QueryVariadicOffset(len(eventStateKeyNIDArray), len(params))
for _, v := range eventStateKeyNIDArray {
params = append(params, v)
}
}
selectOrig += " ORDER BY event_type_nid, event_state_key_nid ASC"
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, fmt.Errorf("s.db.Prepare: %w", err)
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
rows, err := selectStmt.QueryContext(ctx, params...)
if err != nil {
return nil, fmt.Errorf("selectStmt.QueryContext: %w", err)
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateEventByID: rows.close() failed")
// We know that we will only get as many results as event IDs
// because of the unique constraint on event IDs.
// So we can allocate an array of the correct size now.
// We might get fewer results than IDs so we adjust the length of the slice before returning it.
results := make([]types.StateEntry, len(eventNIDs))
i := 0
for ; rows.Next(); i++ {
result := &results[i]
if err = rows.Scan(
&result.EventTypeNID,
&result.EventStateKeyNID,
&result.EventNID,
); err != nil {
return nil, err
}
}
return results[:i], err
}
// bulkSelectStateAtEventByID lookups the state at a list of events by event ID.
// If any of the requested events are missing from the database it returns a types.MissingEventError.
// If we do not have the state for any of the requested events it returns a types.MissingEventError.
func (s *eventStatements) BulkSelectStateAtEventByID(
ctx context.Context, txn *sql.Tx, eventIDs []string,
) ([]types.StateAtEvent, error) {
///////////////
iEventIDs := make([]interface{}, len(eventIDs))
for k, v := range eventIDs {
iEventIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectStateAtEventByIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
///////////////
rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateAtEventByID: rows.close() failed")
results := make([]types.StateAtEvent, len(eventIDs))
i := 0
for ; rows.Next(); i++ {
result := &results[i]
if err = rows.Scan(
&result.EventTypeNID,
&result.EventStateKeyNID,
&result.EventNID,
&result.BeforeStateSnapshotNID,
&result.IsRejected,
); err != nil {
return nil, err
}
// Genuine create events are the only case where it's OK to have no previous state.
isCreate := result.EventTypeNID == types.MRoomCreateNID && result.EventStateKeyNID == 1
if result.BeforeStateSnapshotNID == 0 && !isCreate {
return nil, types.MissingEventError(
fmt.Sprintf("storage: missing state for event NID %d", result.EventNID),
)
}
}
if i != len(eventIDs) {
return nil, types.MissingEventError(
fmt.Sprintf("storage: event IDs missing from the database (%d != %d)", i, len(eventIDs)),
)
}
return results, err
}
func (s *eventStatements) UpdateEventState(
ctx context.Context, txn *sql.Tx, eventNID types.EventNID, stateNID types.StateSnapshotNID,
) error {
stmt := sqlutil.TxStmt(txn, s.updateEventStateStmt)
_, err := stmt.ExecContext(ctx, int64(stateNID), int64(eventNID))
return err
}
func (s *eventStatements) SelectEventSentToOutput(
ctx context.Context, txn *sql.Tx, eventNID types.EventNID,
) (sentToOutput bool, err error) {
selectStmt := sqlutil.TxStmt(txn, s.selectEventSentToOutputStmt)
err = selectStmt.QueryRowContext(ctx, int64(eventNID)).Scan(&sentToOutput)
return
}
func (s *eventStatements) UpdateEventSentToOutput(ctx context.Context, txn *sql.Tx, eventNID types.EventNID) error {
updateStmt := sqlutil.TxStmt(txn, s.updateEventSentToOutputStmt)
_, err := updateStmt.ExecContext(ctx, int64(eventNID))
return err
}
func (s *eventStatements) SelectEventID(
ctx context.Context, txn *sql.Tx, eventNID types.EventNID,
) (eventID string, err error) {
selectStmt := sqlutil.TxStmt(txn, s.selectEventIDStmt)
err = selectStmt.QueryRowContext(ctx, int64(eventNID)).Scan(&eventID)
return
}
func (s *eventStatements) BulkSelectStateAtEventAndReference(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
) ([]types.StateAtEventAndReference, error) {
///////////////
iEventNIDs := make([]interface{}, len(eventNIDs))
for k, v := range eventNIDs {
iEventNIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectStateAtEventAndReferenceSQL, "($1)", sqlutil.QueryVariadic(len(iEventNIDs)), 1)
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
//////////////
rows, err := sqlutil.TxStmt(txn, selectStmt).QueryContext(ctx, iEventNIDs...)
if err != nil {
return nil, fmt.Errorf("sqlutil.TxStmt.QueryContext: %w", err)
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateAtEventAndReference: rows.close() failed")
results := make([]types.StateAtEventAndReference, len(eventNIDs))
i := 0
for ; rows.Next(); i++ {
var (
eventTypeNID int64
eventStateKeyNID int64
eventNID int64
stateSnapshotNID int64
eventID string
eventSHA256 []byte
)
if err = rows.Scan(
&eventTypeNID, &eventStateKeyNID, &eventNID, &stateSnapshotNID, &eventID, &eventSHA256,
); err != nil {
return nil, err
}
result := &results[i]
result.EventTypeNID = types.EventTypeNID(eventTypeNID)
result.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
result.EventNID = types.EventNID(eventNID)
result.BeforeStateSnapshotNID = types.StateSnapshotNID(stateSnapshotNID)
result.EventID = eventID
result.EventSHA256 = eventSHA256
}
if i != len(eventNIDs) {
return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
}
return results, nil
}
func (s *eventStatements) BulkSelectEventReference(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
) ([]gomatrixserverlib.EventReference, error) {
///////////////
iEventNIDs := make([]interface{}, len(eventNIDs))
for k, v := range eventNIDs {
iEventNIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectEventReferenceSQL, "($1)", sqlutil.QueryVariadic(len(iEventNIDs)), 1)
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
///////////////
selectStmt := sqlutil.TxStmt(txn, selectPrep)
rows, err := selectStmt.QueryContext(ctx, iEventNIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventReference: rows.close() failed")
results := make([]gomatrixserverlib.EventReference, len(eventNIDs))
i := 0
for ; rows.Next(); i++ {
result := &results[i]
if err = rows.Scan(&result.EventID, &result.EventSHA256); err != nil {
return nil, err
}
}
if i != len(eventNIDs) {
return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
}
return results, nil
}
// bulkSelectEventID returns a map from numeric event ID to string event ID.
func (s *eventStatements) BulkSelectEventID(ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID) (map[types.EventNID]string, error) {
///////////////
iEventNIDs := make([]interface{}, len(eventNIDs))
for k, v := range eventNIDs {
iEventNIDs[k] = v
}
selectOrig := strings.Replace(bulkSelectEventIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventNIDs)), 1)
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
///////////////
rows, err := selectStmt.QueryContext(ctx, iEventNIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventID: rows.close() failed")
results := make(map[types.EventNID]string, len(eventNIDs))
i := 0
for ; rows.Next(); i++ {
var eventNID int64
var eventID string
if err = rows.Scan(&eventNID, &eventID); err != nil {
return nil, err
}
results[types.EventNID(eventNID)] = eventID
}
if i != len(eventNIDs) {
return nil, fmt.Errorf("storage: event NIDs missing from the database (%d != %d)", i, len(eventNIDs))
}
return results, nil
}
// BulkSelectEventNIDs returns a map from string event ID to numeric event ID.
// If an event ID is not in the database then it is omitted from the map.
func (s *eventStatements) BulkSelectEventNID(ctx context.Context, txn *sql.Tx, eventIDs []string) (map[string]types.EventNID, error) {
return s.bulkSelectEventNID(ctx, txn, eventIDs, false)
}
// BulkSelectEventNIDs returns a map from string event ID to numeric event ID
// only for events that haven't already been sent to the roomserver output.
// If an event ID is not in the database then it is omitted from the map.
func (s *eventStatements) BulkSelectUnsentEventNID(ctx context.Context, txn *sql.Tx, eventIDs []string) (map[string]types.EventNID, error) {
return s.bulkSelectEventNID(ctx, txn, eventIDs, true)
}
// bulkSelectEventNIDs returns a map from string event ID to numeric event ID.
// If an event ID is not in the database then it is omitted from the map.
func (s *eventStatements) bulkSelectEventNID(ctx context.Context, txn *sql.Tx, eventIDs []string, onlyUnsent bool) (map[string]types.EventNID, error) {
///////////////
iEventIDs := make([]interface{}, len(eventIDs))
for k, v := range eventIDs {
iEventIDs[k] = v
}
var selectOrig string
if onlyUnsent {
selectOrig = strings.Replace(bulkSelectUnsentEventNIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
} else {
selectOrig = strings.Replace(bulkSelectEventNIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
}
selectPrep, err := s.db.Prepare(selectOrig)
if err != nil {
return nil, err
}
defer selectPrep.Close() // nolint:errcheck
selectStmt := sqlutil.TxStmt(txn, selectPrep)
///////////////
rows, err := selectStmt.QueryContext(ctx, iEventIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectEventNID: rows.close() failed")
results := make(map[string]types.EventNID, len(eventIDs))
for rows.Next() {
var eventID string
var eventNID int64
if err = rows.Scan(&eventID, &eventNID); err != nil {
return nil, err
}
results[eventID] = types.EventNID(eventNID)
}
return results, nil
}
func (s *eventStatements) SelectMaxEventDepth(ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID) (int64, error) {
var result int64
iEventIDs := make([]interface{}, len(eventNIDs))
for i, v := range eventNIDs {
iEventIDs[i] = v
}
sqlStr := strings.Replace(selectMaxEventDepthSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
sqlPrep, err := s.db.Prepare(sqlStr)
if err != nil {
return 0, err
}
defer sqlPrep.Close()
err = sqlutil.TxStmt(txn, sqlPrep).QueryRowContext(ctx, iEventIDs...).Scan(&result)
if err != nil {
return 0, fmt.Errorf("sqlutil.TxStmt.QueryRowContext: %w", err)
}
return result, nil
}
func (s *eventStatements) SelectRoomNIDsForEventNIDs(
ctx context.Context, txn *sql.Tx, eventNIDs []types.EventNID,
) (map[types.EventNID]types.RoomNID, error) {
sqlStr := strings.Replace(selectRoomNIDsForEventNIDsSQL, "($1)", sqlutil.QueryVariadic(len(eventNIDs)), 1)
sqlPrep, err := s.db.Prepare(sqlStr)
if err != nil {
return nil, err
}
defer sqlPrep.Close()
sqlStmt := sqlutil.TxStmt(txn, sqlPrep)
iEventNIDs := make([]interface{}, len(eventNIDs))
for i, v := range eventNIDs {
iEventNIDs[i] = v
}
rows, err := sqlStmt.QueryContext(ctx, iEventNIDs...)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectRoomNIDsForEventNIDsStmt: rows.close() failed")
result := make(map[types.EventNID]types.RoomNID)
for rows.Next() {
var eventNID types.EventNID
var roomNID types.RoomNID
if err = rows.Scan(&eventNID, &roomNID); err != nil {
return nil, err
}
result[eventNID] = roomNID
}
return result, nil
}
func eventNIDsAsArray(eventNIDs []types.EventNID) string {
if eventNIDs == nil {
eventNIDs = []types.EventNID{} // don't store 'null' in the DB
}
b, _ := json.Marshal(eventNIDs)
return string(b)
}