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db migration: handle create events with no state blocks from v0.1.0 (#1904)

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kegsay 2021-07-07 17:07:33 +01:00 committed by GitHub
parent bb6e4487dd
commit 5a09290c32
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1 changed files with 32 additions and 5 deletions
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37
roomserver/storage/postgres/deltas/2021041615092700_state_blocks_refactor.go
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@ -117,7 +117,7 @@ func UpStateBlocksRefactor(tx *sql.Tx) error {
_roomserver_state_block.event_nid
FROM
_roomserver_state_snapshots
JOIN _roomserver_state_block ON _roomserver_state_block.state_block_nid = ANY (_roomserver_state_snapshots.state_block_nids)
LEFT JOIN _roomserver_state_block ON _roomserver_state_block.state_block_nid = ANY (_roomserver_state_snapshots.state_block_nids)
WHERE
_roomserver_state_snapshots.state_snapshot_nid = ANY (
SELECT
@ -140,22 +140,49 @@ func UpStateBlocksRefactor(tx *sql.Tx) error {
logrus.Warnf("Rewriting snapshots %d-%d of %d...", batchoffset, batchoffset+batchsize, snapshotcount)
var snapshots []stateBlockData
var badCreateSnapshots []stateBlockData
for snapshotrows.Next() {
var snapshot stateBlockData
var eventsarray pq.Int64Array
if err = snapshotrows.Scan(&snapshot.StateSnapshotNID, &snapshot.RoomNID, &snapshot.StateBlockNID, &eventsarray); err != nil {
var eventsarray []sql.NullInt64
var nulStateBlockNID sql.NullInt64
if err = snapshotrows.Scan(&snapshot.StateSnapshotNID, &snapshot.RoomNID, &nulStateBlockNID, pq.Array(&eventsarray)); err != nil {
return fmt.Errorf("rows.Scan: %w", err)
}
if nulStateBlockNID.Valid {
snapshot.StateBlockNID = types.StateBlockNID(nulStateBlockNID.Int64)
}
// Dendrite v0.1.0 would not make a state block for the create event, resulting in [NULL] from the query above.
// Remember the snapshot and we'll fill it in after we close this cursor as we can't have 2 queries running at the same time
if len(eventsarray) == 1 && !eventsarray[0].Valid {
badCreateSnapshots = append(badCreateSnapshots, snapshot)
continue
}
for _, e := range eventsarray {
snapshot.EventNIDs = append(snapshot.EventNIDs, types.EventNID(e))
if e.Valid {
snapshot.EventNIDs = append(snapshot.EventNIDs, types.EventNID(e.Int64))
}
}
snapshot.EventNIDs = snapshot.EventNIDs[:util.SortAndUnique(snapshot.EventNIDs)]
snapshots = append(snapshots, snapshot)
}
if err = snapshotrows.Close(); err != nil {
return fmt.Errorf("snapshots.Close: %w", err)
}
// fill in bad create snapshots
for _, s := range badCreateSnapshots {
var createEventNID types.EventNID
err = tx.QueryRow(
`SELECT event_nid FROM roomserver_events WHERE state_snapshot_nid = $1 AND event_type_nid = 1`, s.StateSnapshotNID,
).Scan(&createEventNID)
if err != nil {
return fmt.Errorf("cannot xref null state block with snapshot %d: %s", s.StateSnapshotNID, err)
}
if createEventNID == 0 {
return fmt.Errorf("cannot xref null state block with snapshot %d, no create event", s.StateSnapshotNID)
}
s.EventNIDs = append(s.EventNIDs, createEventNID)
snapshots = append(snapshots, s)
}
newsnapshots := map[stateSnapshotData]types.StateBlockNIDs{}