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// Copyright 2021 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 msc2946
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/tidwall/gjson"
)
var (
relTypes = map[string]int{
ConstSpaceChildEventType: 1,
ConstSpaceParentEventType: 2,
}
)
type Database interface {
// StoreReference persists a child or parent space mapping.
StoreReference(ctx context.Context, he *gomatrixserverlib.HeaderedEvent) error
// References returns all events which have the given roomID as a parent or child space.
References(ctx context.Context, roomID string) ([]*gomatrixserverlib.HeaderedEvent, error)
}
type DB struct {
db *sql.DB
writer sqlutil.Writer
insertEdgeStmt *sql.Stmt
selectEdgesStmt *sql.Stmt
}
// NewDatabase loads the database for msc2836
func NewDatabase(dbOpts *config.DatabaseOptions) (Database, error) {
if dbOpts.ConnectionString.IsPostgres() {
return newPostgresDatabase(dbOpts)
}
return newSQLiteDatabase(dbOpts)
}
func newPostgresDatabase(dbOpts *config.DatabaseOptions) (Database, error) {
d := DB{
writer: sqlutil.NewDummyWriter(),
}
var err error
if d.db, err = sqlutil.Open(dbOpts); err != nil {
return nil, err
}
_, err = d.db.Exec(`
CREATE TABLE IF NOT EXISTS msc2946_edges (
room_version TEXT NOT NULL,
-- the room ID of the event, the source of the arrow
source_room_id TEXT NOT NULL,
-- the target room ID, the arrow destination
dest_room_id TEXT NOT NULL,
-- the kind of relation, either child or parent (1,2)
rel_type SMALLINT NOT NULL,
event_json TEXT NOT NULL,
CONSTRAINT msc2946_edges_uniq UNIQUE (source_room_id, dest_room_id, rel_type)
);
`)
if err != nil {
return nil, err
}
if d.insertEdgeStmt, err = d.db.Prepare(`
INSERT INTO msc2946_edges(room_version, source_room_id, dest_room_id, rel_type, event_json)
VALUES($1, $2, $3, $4, $5)
ON CONFLICT ON CONSTRAINT msc2946_edges_uniq DO UPDATE SET event_json = $5
`); err != nil {
return nil, err
}
if d.selectEdgesStmt, err = d.db.Prepare(`
SELECT room_version, event_json FROM msc2946_edges
WHERE source_room_id = $1 OR dest_room_id = $2
`); err != nil {
return nil, err
}
return &d, err
}
func newSQLiteDatabase(dbOpts *config.DatabaseOptions) (Database, error) {
d := DB{
writer: sqlutil.NewExclusiveWriter(),
}
var err error
if d.db, err = sqlutil.Open(dbOpts); err != nil {
return nil, err
}
_, err = d.db.Exec(`
CREATE TABLE IF NOT EXISTS msc2946_edges (
room_version TEXT NOT NULL,
-- the room ID of the event, the source of the arrow
source_room_id TEXT NOT NULL,
-- the target room ID, the arrow destination
dest_room_id TEXT NOT NULL,
-- the kind of relation, either child or parent (1,2)
rel_type SMALLINT NOT NULL,
event_json TEXT NOT NULL,
UNIQUE (source_room_id, dest_room_id, rel_type)
);
`)
if err != nil {
return nil, err
}
if d.insertEdgeStmt, err = d.db.Prepare(`
INSERT INTO msc2946_edges(room_version, source_room_id, dest_room_id, rel_type, event_json)
VALUES($1, $2, $3, $4, $5)
ON CONFLICT (source_room_id, dest_room_id, rel_type) DO UPDATE SET event_json = $5
`); err != nil {
return nil, err
}
if d.selectEdgesStmt, err = d.db.Prepare(`
SELECT room_version, event_json FROM msc2946_edges
WHERE source_room_id = $1 OR dest_room_id = $2
`); err != nil {
return nil, err
}
return &d, err
}
func (d *DB) StoreReference(ctx context.Context, he *gomatrixserverlib.HeaderedEvent) error {
target := SpaceTarget(he)
if target == "" {
return nil // malformed event
}
relType := relTypes[he.Type()]
_, err := d.insertEdgeStmt.ExecContext(ctx, he.RoomVersion, he.RoomID(), target, relType, he.JSON())
return err
}
func (d *DB) References(ctx context.Context, roomID string) ([]*gomatrixserverlib.HeaderedEvent, error) {
rows, err := d.selectEdgesStmt.QueryContext(ctx, roomID, roomID)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "failed to close References")
refs := make([]*gomatrixserverlib.HeaderedEvent, 0)
for rows.Next() {
var roomVer string
var jsonBytes []byte
if err := rows.Scan(&roomVer, &jsonBytes); err != nil {
return nil, err
}
ev, err := gomatrixserverlib.NewEventFromTrustedJSON(jsonBytes, false, gomatrixserverlib.RoomVersion(roomVer))
if err != nil {
return nil, err
}
he := ev.Headered(gomatrixserverlib.RoomVersion(roomVer))
refs = append(refs, he)
}
return refs, nil
}
// SpaceTarget returns the destination room ID for the space event. This is either a child or a parent
// depending on the event type.
func SpaceTarget(he *gomatrixserverlib.HeaderedEvent) string {
if he.StateKey() == nil {
return "" // no-op
}
switch he.Type() {
case ConstSpaceParentEventType:
return gjson.GetBytes(he.Content(), "room_id").Str
case ConstSpaceChildEventType:
return *he.StateKey()
}
return ""
}
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