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// Copyright 2022 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"
"time"
"github.com/lib/pq"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/syncapi/synctypes"
"github.com/matrix-org/dendrite/syncapi/types"
)
const presenceSchema = `
CREATE SEQUENCE IF NOT EXISTS syncapi_presence_id;
-- Stores data about presence
CREATE TABLE IF NOT EXISTS syncapi_presence (
-- The ID
id BIGINT PRIMARY KEY DEFAULT nextval('syncapi_presence_id'),
-- The Matrix user ID
user_id TEXT NOT NULL,
-- The actual presence
presence INT NOT NULL,
-- The status message
status_msg TEXT,
-- The last time an action was received by this user
last_active_ts BIGINT NOT NULL,
CONSTRAINT presence_presences_unique UNIQUE (user_id)
);
CREATE INDEX IF NOT EXISTS syncapi_presence_user_id ON syncapi_presence(user_id);
`
const upsertPresenceSQL = "" +
"INSERT INTO syncapi_presence AS p" +
" (user_id, presence, status_msg, last_active_ts)" +
" VALUES ($1, $2, $3, $4)" +
" ON CONFLICT (user_id)" +
" DO UPDATE SET id = nextval('syncapi_presence_id')," +
" presence = $2, status_msg = COALESCE($3, p.status_msg), last_active_ts = $4" +
" RETURNING id"
const upsertPresenceFromSyncSQL = "" +
"INSERT INTO syncapi_presence AS p" +
" (user_id, presence, last_active_ts)" +
" VALUES ($1, $2, $3)" +
" ON CONFLICT (user_id)" +
" DO UPDATE SET id = nextval('syncapi_presence_id')," +
" presence = $2, last_active_ts = $3" +
" RETURNING id"
const selectPresenceForUserSQL = "" +
"SELECT user_id, presence, status_msg, last_active_ts" +
" FROM syncapi_presence" +
" WHERE user_id = ANY($1)"
const selectMaxPresenceSQL = "" +
"SELECT COALESCE(MAX(id), 0) FROM syncapi_presence"
const selectPresenceAfter = "" +
" SELECT id, user_id, presence, status_msg, last_active_ts" +
" FROM syncapi_presence" +
" WHERE id > $1 AND last_active_ts >= $2" +
" ORDER BY id ASC LIMIT $3"
type presenceStatements struct {
upsertPresenceStmt *sql.Stmt
upsertPresenceFromSyncStmt *sql.Stmt
selectPresenceForUsersStmt *sql.Stmt
selectMaxPresenceStmt *sql.Stmt
selectPresenceAfterStmt *sql.Stmt
}
func NewPostgresPresenceTable(db *sql.DB) (*presenceStatements, error) {
_, err := db.Exec(presenceSchema)
if err != nil {
return nil, err
}
s := &presenceStatements{}
return s, sqlutil.StatementList{
{&s.upsertPresenceStmt, upsertPresenceSQL},
{&s.upsertPresenceFromSyncStmt, upsertPresenceFromSyncSQL},
{&s.selectPresenceForUsersStmt, selectPresenceForUserSQL},
{&s.selectMaxPresenceStmt, selectMaxPresenceSQL},
{&s.selectPresenceAfterStmt, selectPresenceAfter},
}.Prepare(db)
}
// UpsertPresence creates/updates a presence status.
func (p *presenceStatements) UpsertPresence(
ctx context.Context,
txn *sql.Tx,
userID string,
statusMsg *string,
presence types.Presence,
lastActiveTS spec.Timestamp,
fromSync bool,
) (pos types.StreamPosition, err error) {
if fromSync {
stmt := sqlutil.TxStmt(txn, p.upsertPresenceFromSyncStmt)
err = stmt.QueryRowContext(ctx, userID, presence, lastActiveTS).Scan(&pos)
} else {
stmt := sqlutil.TxStmt(txn, p.upsertPresenceStmt)
err = stmt.QueryRowContext(ctx, userID, presence, statusMsg, lastActiveTS).Scan(&pos)
}
return
}
// GetPresenceForUsers returns the current presence for a list of users.
// If the user doesn't have a presence status yet, it is omitted from the response.
func (p *presenceStatements) GetPresenceForUsers(
ctx context.Context, txn *sql.Tx,
userIDs []string,
) ([]*types.PresenceInternal, error) {
result := make([]*types.PresenceInternal, 0, len(userIDs))
stmt := sqlutil.TxStmt(txn, p.selectPresenceForUsersStmt)
rows, err := stmt.QueryContext(ctx, pq.Array(userIDs))
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "GetPresenceForUsers: rows.close() failed")
for rows.Next() {
presence := &types.PresenceInternal{}
if err = rows.Scan(&presence.UserID, &presence.Presence, &presence.ClientFields.StatusMsg, &presence.LastActiveTS); err != nil {
return nil, err
}
presence.ClientFields.Presence = presence.Presence.String()
result = append(result, presence)
}
return result, rows.Err()
}
func (p *presenceStatements) GetMaxPresenceID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
stmt := sqlutil.TxStmt(txn, p.selectMaxPresenceStmt)
err = stmt.QueryRowContext(ctx).Scan(&pos)
return
}
// GetPresenceAfter returns the changes presences after a given stream id
func (p *presenceStatements) GetPresenceAfter(
ctx context.Context, txn *sql.Tx,
after types.StreamPosition,
filter synctypes.EventFilter,
) (presences map[string]*types.PresenceInternal, err error) {
presences = make(map[string]*types.PresenceInternal)
stmt := sqlutil.TxStmt(txn, p.selectPresenceAfterStmt)
afterTS := spec.AsTimestamp(time.Now().Add(time.Minute * -5))
rows, err := stmt.QueryContext(ctx, after, afterTS, filter.Limit)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "GetPresenceAfter: failed to close rows")
for rows.Next() {
qryRes := &types.PresenceInternal{}
if err := rows.Scan(&qryRes.StreamPos, &qryRes.UserID, &qryRes.Presence, &qryRes.ClientFields.StatusMsg, &qryRes.LastActiveTS); err != nil {
return nil, err
}
qryRes.ClientFields.Presence = qryRes.Presence.String()
presences[qryRes.UserID] = qryRes
}
return presences, rows.Err()
}
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