storj/satellite/metabase/delete_bucket.go

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// Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.
package metabase
import (
"context"
"database/sql"
"errors"
"storj.io/common/uuid"
"storj.io/private/dbutil"
"storj.io/private/tagsql"
)
const (
deleteBatchSizeLimit = intLimitRange(50)
)
// DeleteBucketObjects contains arguments for deleting a whole bucket.
type DeleteBucketObjects struct {
Bucket BucketLocation
BatchSize int
// DeletePieces is called for every batch of objects.
// Slice `segments` will be reused between calls.
DeletePieces func(ctx context.Context, segments []DeletedSegmentInfo) error
}
// DeleteBucketObjects deletes all objects in the specified bucket.
// Deletion performs in batches, so in case of error while processing,
// this method will return the number of objects deleted to the moment
// when an error occurs.
func (db *DB) DeleteBucketObjects(ctx context.Context, opts DeleteBucketObjects) (deletedObjectCount int64, err error) {
defer mon.Task()(&ctx)(&err)
if err := opts.Bucket.Verify(); err != nil {
return 0, err
}
deleteBatchSizeLimit.Ensure(&opts.BatchSize)
var query string
switch db.impl {
case dbutil.Cockroach:
query = `
WITH deleted_objects AS (
DELETE FROM objects
WHERE project_id = $1 AND bucket_name = $2 LIMIT $3
RETURNING objects.stream_id
)
DELETE FROM segments
WHERE segments.stream_id in (SELECT deleted_objects.stream_id FROM deleted_objects)
RETURNING segments.stream_id, segments.root_piece_id, segments.remote_alias_pieces
`
case dbutil.Postgres:
query = `
WITH deleted_objects AS (
DELETE FROM objects
WHERE stream_id IN (
SELECT stream_id FROM objects
WHERE project_id = $1 AND bucket_name = $2
LIMIT $3
)
RETURNING objects.stream_id
)
DELETE FROM segments
WHERE segments.stream_id in (SELECT deleted_objects.stream_id FROM deleted_objects)
RETURNING segments.stream_id, segments.root_piece_id, segments.remote_alias_pieces
`
default:
return 0, Error.New("unhandled database: %v", db.impl)
}
// TODO: fix the count for objects without segments
deletedSegments := make([]DeletedSegmentInfo, 0, 100)
for {
if err := ctx.Err(); err != nil {
return 0, err
}
deletedSegments = deletedSegments[:0]
deletedObjects := 0
err = withRows(db.db.QueryContext(ctx, query,
opts.Bucket.ProjectID, []byte(opts.Bucket.BucketName), opts.BatchSize))(func(rows tagsql.Rows) error {
ids := map[uuid.UUID]struct{}{} // TODO: avoid map here
for rows.Next() {
var streamID uuid.UUID
var segment DeletedSegmentInfo
var aliasPieces AliasPieces
err := rows.Scan(&streamID, &segment.RootPieceID, &aliasPieces)
if err != nil {
return Error.Wrap(err)
}
segment.Pieces, err = db.aliasCache.ConvertAliasesToPieces(ctx, aliasPieces)
if err != nil {
return Error.Wrap(err)
}
ids[streamID] = struct{}{}
deletedSegments = append(deletedSegments, segment)
}
deletedObjects = len(ids)
deletedObjectCount += int64(deletedObjects)
return nil
})
mon.Meter("object_delete").Mark(deletedObjects)
mon.Meter("segment_delete").Mark(len(deletedSegments))
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return deletedObjectCount, nil
}
return deletedObjectCount, Error.Wrap(err)
}
if len(deletedSegments) == 0 {
return deletedObjectCount, nil
}
if opts.DeletePieces != nil {
err = opts.DeletePieces(ctx, deletedSegments)
if err != nil {
return deletedObjectCount, Error.Wrap(err)
}
}
}
}