mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-22 19:03:44 +01:00
256 lines
7.6 KiB
Go
256 lines
7.6 KiB
Go
// Copyright 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"
|
|
"encoding/json"
|
|
"time"
|
|
|
|
"github.com/matrix-org/gomatrixserverlib"
|
|
log "github.com/sirupsen/logrus"
|
|
)
|
|
|
|
const appserviceEventsSchema = `
|
|
-- Stores events to be sent to application services
|
|
CREATE TABLE IF NOT EXISTS appservice_events (
|
|
-- An auto-incrementing id unique to each event in the table
|
|
id BIGSERIAL NOT NULL PRIMARY KEY,
|
|
-- The ID of the application service the event will be sent to
|
|
as_id TEXT NOT NULL,
|
|
-- JSON representation of the event
|
|
headered_event_json TEXT NOT NULL,
|
|
-- The ID of the transaction that this event is a part of
|
|
txn_id BIGINT NOT NULL
|
|
);
|
|
|
|
CREATE INDEX IF NOT EXISTS appservice_events_as_id ON appservice_events(as_id);
|
|
`
|
|
|
|
const selectEventsByApplicationServiceIDSQL = "" +
|
|
"SELECT id, headered_event_json, txn_id " +
|
|
"FROM appservice_events WHERE as_id = $1 ORDER BY txn_id DESC, id ASC"
|
|
|
|
const countEventsByApplicationServiceIDSQL = "" +
|
|
"SELECT COUNT(id) FROM appservice_events WHERE as_id = $1"
|
|
|
|
const insertEventSQL = "" +
|
|
"INSERT INTO appservice_events(as_id, headered_event_json, txn_id) " +
|
|
"VALUES ($1, $2, $3)"
|
|
|
|
const updateTxnIDForEventsSQL = "" +
|
|
"UPDATE appservice_events SET txn_id = $1 WHERE as_id = $2 AND id <= $3"
|
|
|
|
const deleteEventsBeforeAndIncludingIDSQL = "" +
|
|
"DELETE FROM appservice_events WHERE as_id = $1 AND id <= $2"
|
|
|
|
const (
|
|
// A transaction ID number that no transaction should ever have. Used for
|
|
// checking again the default value.
|
|
invalidTxnID = -2
|
|
)
|
|
|
|
type eventsStatements struct {
|
|
selectEventsByApplicationServiceIDStmt *sql.Stmt
|
|
countEventsByApplicationServiceIDStmt *sql.Stmt
|
|
insertEventStmt *sql.Stmt
|
|
updateTxnIDForEventsStmt *sql.Stmt
|
|
deleteEventsBeforeAndIncludingIDStmt *sql.Stmt
|
|
}
|
|
|
|
func (s *eventsStatements) prepare(db *sql.DB) (err error) {
|
|
_, err = db.Exec(appserviceEventsSchema)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if s.selectEventsByApplicationServiceIDStmt, err = db.Prepare(selectEventsByApplicationServiceIDSQL); err != nil {
|
|
return
|
|
}
|
|
if s.countEventsByApplicationServiceIDStmt, err = db.Prepare(countEventsByApplicationServiceIDSQL); err != nil {
|
|
return
|
|
}
|
|
if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
|
|
return
|
|
}
|
|
if s.updateTxnIDForEventsStmt, err = db.Prepare(updateTxnIDForEventsSQL); err != nil {
|
|
return
|
|
}
|
|
if s.deleteEventsBeforeAndIncludingIDStmt, err = db.Prepare(deleteEventsBeforeAndIncludingIDSQL); err != nil {
|
|
return
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// selectEventsByApplicationServiceID takes in an application service ID and
|
|
// returns a slice of events that need to be sent to that application service,
|
|
// as well as an int later used to remove these same events from the database
|
|
// once successfully sent to an application service.
|
|
func (s *eventsStatements) selectEventsByApplicationServiceID(
|
|
ctx context.Context,
|
|
applicationServiceID string,
|
|
limit int,
|
|
) (
|
|
txnID, maxID int,
|
|
events []gomatrixserverlib.HeaderedEvent,
|
|
eventsRemaining bool,
|
|
err error,
|
|
) {
|
|
defer func() {
|
|
if err != nil {
|
|
log.WithFields(log.Fields{
|
|
"appservice": applicationServiceID,
|
|
}).WithError(err).Fatalf("appservice unable to select new events to send")
|
|
}
|
|
}()
|
|
// Retrieve events from the database. Unsuccessfully sent events first
|
|
eventRows, err := s.selectEventsByApplicationServiceIDStmt.QueryContext(ctx, applicationServiceID)
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer checkNamedErr(eventRows.Close, &err)
|
|
events, maxID, txnID, eventsRemaining, err = retrieveEvents(eventRows, limit)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// checkNamedErr calls fn and overwrite err if it was nil and fn returned non-nil
|
|
func checkNamedErr(fn func() error, err *error) {
|
|
if e := fn(); e != nil && *err == nil {
|
|
*err = e
|
|
}
|
|
}
|
|
|
|
func retrieveEvents(eventRows *sql.Rows, limit int) (events []gomatrixserverlib.HeaderedEvent, maxID, txnID int, eventsRemaining bool, err error) {
|
|
// Get current time for use in calculating event age
|
|
nowMilli := time.Now().UnixNano() / int64(time.Millisecond)
|
|
|
|
// Iterate through each row and store event contents
|
|
// If txn_id changes dramatically, we've switched from collecting old events to
|
|
// new ones. Send back those events first.
|
|
lastTxnID := invalidTxnID
|
|
for eventsProcessed := 0; eventRows.Next(); {
|
|
var event gomatrixserverlib.HeaderedEvent
|
|
var eventJSON []byte
|
|
var id int
|
|
err = eventRows.Scan(
|
|
&id,
|
|
&eventJSON,
|
|
&txnID,
|
|
)
|
|
if err != nil {
|
|
return nil, 0, 0, false, err
|
|
}
|
|
|
|
// Unmarshal eventJSON
|
|
if err = json.Unmarshal(eventJSON, &event); err != nil {
|
|
return nil, 0, 0, false, err
|
|
}
|
|
|
|
// If txnID has changed on this event from the previous event, then we've
|
|
// reached the end of a transaction's events. Return only those events.
|
|
if lastTxnID > invalidTxnID && lastTxnID != txnID {
|
|
return events, maxID, lastTxnID, true, nil
|
|
}
|
|
lastTxnID = txnID
|
|
|
|
// Limit events that aren't part of an old transaction
|
|
if txnID == -1 {
|
|
// Return if we've hit the limit
|
|
if eventsProcessed++; eventsProcessed > limit {
|
|
return events, maxID, lastTxnID, true, nil
|
|
}
|
|
}
|
|
|
|
if id > maxID {
|
|
maxID = id
|
|
}
|
|
|
|
// Portion of the event that is unsigned due to rapid change
|
|
// TODO: Consider removing age as not many app services use it
|
|
if err = event.SetUnsignedField("age", nowMilli-int64(event.OriginServerTS())); err != nil {
|
|
return nil, 0, 0, false, err
|
|
}
|
|
|
|
events = append(events, event)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// countEventsByApplicationServiceID inserts an event mapped to its corresponding application service
|
|
// IDs into the db.
|
|
func (s *eventsStatements) countEventsByApplicationServiceID(
|
|
ctx context.Context,
|
|
appServiceID string,
|
|
) (int, error) {
|
|
var count int
|
|
err := s.countEventsByApplicationServiceIDStmt.QueryRowContext(ctx, appServiceID).Scan(&count)
|
|
if err != nil && err != sql.ErrNoRows {
|
|
return 0, err
|
|
}
|
|
|
|
return count, nil
|
|
}
|
|
|
|
// insertEvent inserts an event mapped to its corresponding application service
|
|
// IDs into the db.
|
|
func (s *eventsStatements) insertEvent(
|
|
ctx context.Context,
|
|
appServiceID string,
|
|
event *gomatrixserverlib.HeaderedEvent,
|
|
) (err error) {
|
|
// Convert event to JSON before inserting
|
|
eventJSON, err := json.Marshal(event)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = s.insertEventStmt.ExecContext(
|
|
ctx,
|
|
appServiceID,
|
|
eventJSON,
|
|
-1, // No transaction ID yet
|
|
)
|
|
return
|
|
}
|
|
|
|
// updateTxnIDForEvents sets the transactionID for a collection of events. Done
|
|
// before sending them to an AppService. Referenced before sending to make sure
|
|
// we aren't constructing multiple transactions with the same events.
|
|
func (s *eventsStatements) updateTxnIDForEvents(
|
|
ctx context.Context,
|
|
appserviceID string,
|
|
maxID, txnID int,
|
|
) (err error) {
|
|
_, err = s.updateTxnIDForEventsStmt.ExecContext(ctx, txnID, appserviceID, maxID)
|
|
return
|
|
}
|
|
|
|
// deleteEventsBeforeAndIncludingID removes events matching given IDs from the database.
|
|
func (s *eventsStatements) deleteEventsBeforeAndIncludingID(
|
|
ctx context.Context,
|
|
appserviceID string,
|
|
eventTableID int,
|
|
) (err error) {
|
|
_, err = s.deleteEventsBeforeAndIncludingIDStmt.ExecContext(ctx, appserviceID, eventTableID)
|
|
return
|
|
}
|