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Add tests for the UpDropEventReferenceSHAPrevEvents
migration (#3087)
... as they could fail if there are duplicate events in `roomserver_previous_events`. This fixes the migration by trying to combine the `event_nids` if possible (same room) as mentioned by @kegsay in https://github.com/matrix-org/dendrite/pull/3083#discussion_r1195508963
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parent
3dcca4017c
commit
61341aca50
@ -18,19 +18,14 @@ import (
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"context"
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"database/sql"
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"fmt"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/util"
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)
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func UpDropEventReferenceSHAEvents(ctx context.Context, tx *sql.Tx) error {
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var count int
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err := tx.QueryRowContext(ctx, `SELECT count(*) FROM roomserver_events GROUP BY event_id HAVING count(event_id) > 1`).
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Scan(&count)
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if err != nil && err != sql.ErrNoRows {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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if count > 0 {
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return fmt.Errorf("unable to drop column, as there are duplicate event ids")
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}
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_, err = tx.ExecContext(ctx, `ALTER TABLE roomserver_events DROP COLUMN IF EXISTS reference_sha256;`)
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_, err := tx.ExecContext(ctx, `ALTER TABLE roomserver_events DROP COLUMN IF EXISTS reference_sha256;`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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@ -46,9 +41,80 @@ func UpDropEventReferenceSHAPrevEvents(ctx context.Context, tx *sql.Tx) error {
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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// figure out if there are duplicates
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dupeRows, err := tx.QueryContext(ctx, `SELECT previous_event_id FROM roomserver_previous_events GROUP BY previous_event_id HAVING count(previous_event_id) > 1`)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeRows, "failed to close rows")
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var prevEvents []string
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var prevEventID string
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for dupeRows.Next() {
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if err = dupeRows.Scan(&prevEventID); err != nil {
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return err
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}
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prevEvents = append(prevEvents, prevEventID)
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}
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if dupeRows.Err() != nil {
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return dupeRows.Err()
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}
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// if we found duplicates, check if we can combine them, e.g. they are in the same room
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for _, dupeID := range prevEvents {
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var dupeNIDsRows *sql.Rows
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dupeNIDsRows, err = tx.QueryContext(ctx, `SELECT event_nids FROM roomserver_previous_events WHERE previous_event_id = $1`, dupeID)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeNIDsRows, "failed to close rows")
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var dupeNIDs []int64
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for dupeNIDsRows.Next() {
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var nids pq.Int64Array
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if err = dupeNIDsRows.Scan(&nids); err != nil {
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return err
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}
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dupeNIDs = append(dupeNIDs, nids...)
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}
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if dupeNIDsRows.Err() != nil {
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return dupeNIDsRows.Err()
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}
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// dedupe NIDs
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dupeNIDs = dupeNIDs[:util.SortAndUnique(nids(dupeNIDs))]
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// now that we have all NIDs, check which room they belong to
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var roomCount int
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err = tx.QueryRowContext(ctx, `SELECT count(distinct room_nid) FROM roomserver_events WHERE event_nid = ANY($1)`, pq.Array(dupeNIDs)).Scan(&roomCount)
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if err != nil {
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return err
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}
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// if the events are from different rooms, that's bad and we can't continue
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if roomCount > 1 {
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return fmt.Errorf("detected events (%v) referenced for different rooms (%v)", dupeNIDs, roomCount)
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}
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// otherwise delete the dupes
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_, err = tx.ExecContext(ctx, "DELETE FROM roomserver_previous_events WHERE previous_event_id = $1", dupeID)
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if err != nil {
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return fmt.Errorf("unable to delete duplicates: %w", err)
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}
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// insert combined values
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_, err = tx.ExecContext(ctx, "INSERT INTO roomserver_previous_events (previous_event_id, event_nids) VALUES ($1, $2)", dupeID, pq.Array(dupeNIDs))
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if err != nil {
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return fmt.Errorf("unable to insert new event NIDs: %w", err)
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}
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}
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_, err = tx.ExecContext(ctx, `ALTER TABLE roomserver_previous_events ADD CONSTRAINT roomserver_previous_event_id_unique UNIQUE (previous_event_id);`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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return nil
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}
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type nids []int64
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func (s nids) Len() int { return len(s) }
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func (s nids) Less(i, j int) bool { return s[i] < s[j] }
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func (s nids) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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@ -0,0 +1,60 @@
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package deltas
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import (
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"testing"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/test"
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"github.com/matrix-org/dendrite/test/testrig"
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"github.com/stretchr/testify/assert"
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)
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func TestUpDropEventReferenceSHAPrevEvents(t *testing.T) {
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cfg, ctx, close := testrig.CreateConfig(t, test.DBTypePostgres)
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defer close()
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db, err := sqlutil.Open(&cfg.Global.DatabaseOptions, sqlutil.NewDummyWriter())
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assert.Nil(t, err)
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assert.NotNil(t, db)
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defer db.Close()
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// create the table in the old layout
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_, err = db.ExecContext(ctx.Context(), `
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CREATE TABLE IF NOT EXISTS roomserver_previous_events (
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previous_event_id TEXT NOT NULL,
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event_nids BIGINT[] NOT NULL,
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previous_reference_sha256 BYTEA NOT NULL,
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CONSTRAINT roomserver_previous_event_id_unique UNIQUE (previous_event_id, previous_reference_sha256)
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);`)
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assert.Nil(t, err)
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// create the events table as well, slimmed down with one eventNID
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_, err = db.ExecContext(ctx.Context(), `
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CREATE SEQUENCE IF NOT EXISTS roomserver_event_nid_seq;
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CREATE TABLE IF NOT EXISTS roomserver_events (
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event_nid BIGINT PRIMARY KEY DEFAULT nextval('roomserver_event_nid_seq'),
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room_nid BIGINT NOT NULL
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);
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INSERT INTO roomserver_events (event_nid, room_nid) VALUES (1, 1)
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`)
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assert.Nil(t, err)
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// insert duplicate prev events with different event_nids
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stmt, err := db.PrepareContext(ctx.Context(), `INSERT INTO roomserver_previous_events (previous_event_id, event_nids, previous_reference_sha256) VALUES ($1, $2, $3)`)
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assert.Nil(t, err)
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assert.NotNil(t, stmt)
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_, err = stmt.ExecContext(ctx.Context(), "1", pq.Array([]int64{1, 2}), "a")
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assert.Nil(t, err)
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_, err = stmt.ExecContext(ctx.Context(), "1", pq.Array([]int64{1, 2, 3}), "b")
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assert.Nil(t, err)
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// execute the migration
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txn, err := db.Begin()
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assert.Nil(t, err)
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assert.NotNil(t, txn)
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defer txn.Rollback()
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err = UpDropEventReferenceSHAPrevEvents(ctx.Context(), txn)
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assert.NoError(t, err)
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}
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@ -18,6 +18,10 @@ import (
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"context"
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"database/sql"
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"fmt"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/util"
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)
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func UpDropEventReferenceSHA(ctx context.Context, tx *sql.Tx) error {
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@ -52,8 +56,72 @@ func UpDropEventReferenceSHAPrevEvents(ctx context.Context, tx *sql.Tx) error {
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return fmt.Errorf("tx.ExecContext: %w", err)
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}
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// figure out if there are duplicates
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dupeRows, err := tx.QueryContext(ctx, `SELECT previous_event_id FROM _roomserver_previous_events GROUP BY previous_event_id HAVING count(previous_event_id) > 1`)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeRows, "failed to close rows")
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var prevEvents []string
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var prevEventID string
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for dupeRows.Next() {
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if err = dupeRows.Scan(&prevEventID); err != nil {
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return err
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}
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prevEvents = append(prevEvents, prevEventID)
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}
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if dupeRows.Err() != nil {
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return dupeRows.Err()
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}
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// if we found duplicates, check if we can combine them, e.g. they are in the same room
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for _, dupeID := range prevEvents {
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var dupeNIDsRows *sql.Rows
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dupeNIDsRows, err = tx.QueryContext(ctx, `SELECT event_nids FROM _roomserver_previous_events WHERE previous_event_id = $1`, dupeID)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeNIDsRows, "failed to close rows")
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var dupeNIDs []int64
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for dupeNIDsRows.Next() {
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var nids pq.Int64Array
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if err = dupeNIDsRows.Scan(&nids); err != nil {
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return err
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}
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dupeNIDs = append(dupeNIDs, nids...)
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}
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if dupeNIDsRows.Err() != nil {
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return dupeNIDsRows.Err()
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}
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// dedupe NIDs
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dupeNIDs = dupeNIDs[:util.SortAndUnique(nids(dupeNIDs))]
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// now that we have all NIDs, check which room they belong to
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var roomCount int
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err = tx.QueryRowContext(ctx, `SELECT count(distinct room_nid) FROM roomserver_events WHERE event_nid IN ($1)`, pq.Array(dupeNIDs)).Scan(&roomCount)
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if err != nil {
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return err
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}
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// if the events are from different rooms, that's bad and we can't continue
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if roomCount > 1 {
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return fmt.Errorf("detected events (%v) referenced for different rooms (%v)", dupeNIDs, roomCount)
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}
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// otherwise delete the dupes
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_, err = tx.ExecContext(ctx, "DELETE FROM _roomserver_previous_events WHERE previous_event_id = $1", dupeID)
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if err != nil {
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return fmt.Errorf("unable to delete duplicates: %w", err)
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}
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// insert combined values
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_, err = tx.ExecContext(ctx, "INSERT INTO _roomserver_previous_events (previous_event_id, event_nids) VALUES ($1, $2)", dupeID, pq.Array(dupeNIDs))
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if err != nil {
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return fmt.Errorf("unable to insert new event NIDs: %w", err)
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}
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}
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// move data
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if _, err := tx.ExecContext(ctx, `
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if _, err = tx.ExecContext(ctx, `
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INSERT
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INTO roomserver_previous_events (
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previous_event_id, event_nids
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@ -64,9 +132,15 @@ INSERT
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return fmt.Errorf("tx.ExecContext: %w", err)
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}
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// drop old table
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_, err := tx.ExecContext(ctx, `DROP TABLE _roomserver_previous_events;`)
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_, err = tx.ExecContext(ctx, `DROP TABLE _roomserver_previous_events;`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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return nil
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}
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type nids []int64
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func (s nids) Len() int { return len(s) }
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func (s nids) Less(i, j int) bool { return s[i] < s[j] }
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func (s nids) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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@ -0,0 +1,59 @@
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package deltas
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import (
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"testing"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/test"
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"github.com/matrix-org/dendrite/test/testrig"
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"github.com/stretchr/testify/assert"
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)
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func TestUpDropEventReferenceSHAPrevEvents(t *testing.T) {
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cfg, ctx, close := testrig.CreateConfig(t, test.DBTypeSQLite)
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defer close()
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db, err := sqlutil.Open(&cfg.RoomServer.Database, sqlutil.NewExclusiveWriter())
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assert.Nil(t, err)
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assert.NotNil(t, db)
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defer db.Close()
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// create the table in the old layout
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_, err = db.ExecContext(ctx.Context(), `
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CREATE TABLE IF NOT EXISTS roomserver_previous_events (
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previous_event_id TEXT NOT NULL,
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previous_reference_sha256 BLOB,
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event_nids TEXT NOT NULL,
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UNIQUE (previous_event_id, previous_reference_sha256)
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);`)
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assert.Nil(t, err)
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// create the events table as well, slimmed down with one eventNID
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_, err = db.ExecContext(ctx.Context(), `
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CREATE TABLE IF NOT EXISTS roomserver_events (
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event_nid INTEGER PRIMARY KEY AUTOINCREMENT,
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room_nid INTEGER NOT NULL
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);
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INSERT INTO roomserver_events (event_nid, room_nid) VALUES (1, 1)
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`)
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assert.Nil(t, err)
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// insert duplicate prev events with different event_nids
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stmt, err := db.PrepareContext(ctx.Context(), `INSERT INTO roomserver_previous_events (previous_event_id, event_nids, previous_reference_sha256) VALUES ($1, $2, $3)`)
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assert.Nil(t, err)
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assert.NotNil(t, stmt)
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_, err = stmt.ExecContext(ctx.Context(), "1", "{1,2}", "a")
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assert.Nil(t, err)
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_, err = stmt.ExecContext(ctx.Context(), "1", "{1,2,3}", "b")
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assert.Nil(t, err)
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// execute the migration
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txn, err := db.Begin()
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assert.Nil(t, err)
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assert.NotNil(t, txn)
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err = UpDropEventReferenceSHAPrevEvents(ctx.Context(), txn)
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defer txn.Rollback()
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assert.NoError(t, err)
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}
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