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package msc2836
import (
"context"
"database/sql"
"encoding/json"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/gomatrixserverlib"
)
type eventInfo struct {
EventID string
OriginServerTS gomatrixserverlib.Timestamp
RoomID string
Servers []string
}
type Database interface {
// StoreRelation stores the parent->child and child->parent relationship for later querying.
// Also stores the event metadata e.g timestamp
StoreRelation(ctx context.Context, ev *gomatrixserverlib.HeaderedEvent) error
// ChildrenForParent returns the events who have the given `eventID` as an m.relationship with the
// provided `relType`. The returned slice is sorted by origin_server_ts according to whether
// `recentFirst` is true or false.
ChildrenForParent(ctx context.Context, eventID, relType string, recentFirst bool) ([]eventInfo, error)
}
type DB struct {
db *sql.DB
writer sqlutil.Writer
insertEdgeStmt *sql.Stmt
insertNodeStmt *sql.Stmt
selectChildrenForParentOldestFirstStmt *sql.Stmt
selectChildrenForParentRecentFirstStmt *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 msc2836_edges (
parent_event_id TEXT NOT NULL,
child_event_id TEXT NOT NULL,
rel_type TEXT NOT NULL,
parent_room_id TEXT NOT NULL,
parent_servers TEXT NOT NULL,
CONSTRAINT msc2836_edges_uniq UNIQUE (parent_event_id, child_event_id, rel_type)
);
CREATE TABLE IF NOT EXISTS msc2836_nodes (
event_id TEXT PRIMARY KEY NOT NULL,
origin_server_ts BIGINT NOT NULL,
room_id TEXT NOT NULL
);
`)
if err != nil {
return nil, err
}
if d.insertEdgeStmt, err = d.db.Prepare(`
INSERT INTO msc2836_edges(parent_event_id, child_event_id, rel_type, parent_room_id, parent_servers) VALUES($1, $2, $3, $4, $5) ON CONFLICT DO NOTHING
`); err != nil {
return nil, err
}
if d.insertNodeStmt, err = d.db.Prepare(`
INSERT INTO msc2836_nodes(event_id, origin_server_ts, room_id) VALUES($1, $2, $3) ON CONFLICT DO NOTHING
`); err != nil {
return nil, err
}
selectChildrenQuery := `
SELECT child_event_id, origin_server_ts, room_id FROM msc2836_edges
LEFT JOIN msc2836_nodes ON msc2836_edges.child_event_id = msc2836_nodes.event_id
WHERE parent_event_id = $1 AND rel_type = $2
ORDER BY origin_server_ts
`
if d.selectChildrenForParentOldestFirstStmt, err = d.db.Prepare(selectChildrenQuery + "ASC"); err != nil {
return nil, err
}
if d.selectChildrenForParentRecentFirstStmt, err = d.db.Prepare(selectChildrenQuery + "DESC"); 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 msc2836_edges (
parent_event_id TEXT NOT NULL,
child_event_id TEXT NOT NULL,
rel_type TEXT NOT NULL,
parent_room_id TEXT NOT NULL,
parent_servers TEXT NOT NULL,
UNIQUE (parent_event_id, child_event_id, rel_type)
);
CREATE TABLE IF NOT EXISTS msc2836_nodes (
event_id TEXT PRIMARY KEY NOT NULL,
origin_server_ts BIGINT NOT NULL,
room_id TEXT NOT NULL
);
`)
if err != nil {
return nil, err
}
if d.insertEdgeStmt, err = d.db.Prepare(`
INSERT INTO msc2836_edges(parent_event_id, child_event_id, rel_type, parent_room_id, parent_servers) VALUES($1, $2, $3, $4, $5) ON CONFLICT (parent_event_id, child_event_id, rel_type) DO NOTHING
`); err != nil {
return nil, err
}
if d.insertNodeStmt, err = d.db.Prepare(`
INSERT INTO msc2836_nodes(event_id, origin_server_ts, room_id) VALUES($1, $2, $3) ON CONFLICT DO NOTHING
`); err != nil {
return nil, err
}
selectChildrenQuery := `
SELECT child_event_id, origin_server_ts, room_id FROM msc2836_edges
LEFT JOIN msc2836_nodes ON msc2836_edges.child_event_id = msc2836_nodes.event_id
WHERE parent_event_id = $1 AND rel_type = $2
ORDER BY origin_server_ts
`
if d.selectChildrenForParentOldestFirstStmt, err = d.db.Prepare(selectChildrenQuery + "ASC"); err != nil {
return nil, err
}
if d.selectChildrenForParentRecentFirstStmt, err = d.db.Prepare(selectChildrenQuery + "DESC"); err != nil {
return nil, err
}
return &d, nil
}
func (p *DB) StoreRelation(ctx context.Context, ev *gomatrixserverlib.HeaderedEvent) error {
parent, child, relType := parentChildEventIDs(ev)
if parent == "" || child == "" {
return nil
}
relationRoomID, relationServers := roomIDAndServers(ev)
relationServersJSON, err := json.Marshal(relationServers)
if err != nil {
return err
}
return p.writer.Do(p.db, nil, func(txn *sql.Tx) error {
_, err := txn.Stmt(p.insertEdgeStmt).ExecContext(ctx, parent, child, relType, relationRoomID, string(relationServersJSON))
if err != nil {
return err
}
_, err = txn.Stmt(p.insertNodeStmt).ExecContext(ctx, ev.EventID(), ev.OriginServerTS(), ev.RoomID())
return err
})
}
func (p *DB) ChildrenForParent(ctx context.Context, eventID, relType string, recentFirst bool) ([]eventInfo, error) {
var rows *sql.Rows
var err error
if recentFirst {
rows, err = p.selectChildrenForParentRecentFirstStmt.QueryContext(ctx, eventID, relType)
} else {
rows, err = p.selectChildrenForParentOldestFirstStmt.QueryContext(ctx, eventID, relType)
}
if err != nil {
return nil, err
}
defer rows.Close() // nolint: errcheck
var children []eventInfo
for rows.Next() {
var evInfo eventInfo
if err := rows.Scan(&evInfo.EventID, &evInfo.OriginServerTS, &evInfo.RoomID); err != nil {
return nil, err
}
children = append(children, evInfo)
}
return children, nil
}
func parentChildEventIDs(ev *gomatrixserverlib.HeaderedEvent) (parent, child, relType string) {
if ev == nil {
return
}
body := struct {
Relationship struct {
RelType string `json:"rel_type"`
EventID string `json:"event_id"`
} `json:"m.relationship"`
}{}
if err := json.Unmarshal(ev.Content(), &body); err != nil {
return
}
if body.Relationship.EventID == "" || body.Relationship.RelType == "" {
return
}
return body.Relationship.EventID, ev.EventID(), body.Relationship.RelType
}
func roomIDAndServers(ev *gomatrixserverlib.HeaderedEvent) (roomID string, servers []string) {
servers = []string{}
if ev == nil {
return
}
body := struct {
RoomID string `json:"relationship_room_id"`
Servers []string `json:"relationship_servers"`
}{}
if err := json.Unmarshal(ev.Unsigned(), &body); err != nil {
return
}
return body.RoomID, body.Servers
}
|
