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precommit.go
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precommit.go
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// Copyright (C) 2023 Storj Labs, Inc.
// See LICENSE for copying information.
package metabase
import (
"context"
"database/sql"
"errors"
"go.uber.org/zap"
"storj.io/common/uuid"
)
type precommitTransactionAdapter interface {
precommitQueryHighest(ctx context.Context, loc ObjectLocation) (highest Version, err error)
precommitQueryHighestAndUnversioned(ctx context.Context, loc ObjectLocation) (highest Version, unversionedExists bool, err error)
precommitDeleteUnversioned(ctx context.Context, loc ObjectLocation) (result precommitConstraintResult, err error)
}
type precommitConstraint struct {
Location ObjectLocation
Versioned bool
DisallowDelete bool
}
type precommitConstraintResult struct {
Deleted []Object
// DeletedObjectCount returns how many objects were deleted.
DeletedObjectCount int
// DeletedSegmentCount returns how many segments were deleted.
DeletedSegmentCount int
// HighestVersion returns tha highest version that was present in the table.
// It returns 0 if there was none.
HighestVersion Version
}
func (r *precommitConstraintResult) submitMetrics() {
mon.Meter("object_delete").Mark(r.DeletedObjectCount)
mon.Meter("segment_delete").Mark(r.DeletedSegmentCount)
}
type stmtRow interface {
QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
}
// precommitConstraint ensures that only a single uncommitted object exists at the specified location.
func (db *DB) precommitConstraint(ctx context.Context, opts precommitConstraint, adapter precommitTransactionAdapter) (result precommitConstraintResult, err error) {
defer mon.Task()(&ctx)(&err)
if err := opts.Location.Verify(); err != nil {
return result, Error.Wrap(err)
}
if opts.Versioned {
highest, err := adapter.precommitQueryHighest(ctx, opts.Location)
if err != nil {
return precommitConstraintResult{}, Error.Wrap(err)
}
result.HighestVersion = highest
return result, nil
}
if opts.DisallowDelete {
highest, unversionedExists, err := adapter.precommitQueryHighestAndUnversioned(ctx, opts.Location)
if err != nil {
return precommitConstraintResult{}, Error.Wrap(err)
}
result.HighestVersion = highest
if unversionedExists {
return precommitConstraintResult{}, ErrPermissionDenied.New("no permissions to delete existing object")
}
return result, nil
}
return adapter.precommitDeleteUnversioned(ctx, opts.Location)
}
// precommitQueryHighest queries the highest version for a given object.
func (ptx *postgresTransactionAdapter) precommitQueryHighest(ctx context.Context, loc ObjectLocation) (highest Version, err error) {
defer mon.Task()(&ctx)(&err)
if err := loc.Verify(); err != nil {
return 0, Error.Wrap(err)
}
err = ptx.tx.QueryRowContext(ctx, `
SELECT version
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3)
ORDER BY version DESC
LIMIT 1
`, loc.ProjectID, []byte(loc.BucketName), loc.ObjectKey).Scan(&highest)
if errors.Is(err, sql.ErrNoRows) {
return 0, nil
}
if err != nil {
return 0, Error.Wrap(err)
}
return highest, nil
}
// precommitQueryHighestAndUnversioned queries the highest version for a given object and whether an unversioned object or delete marker exists.
func (ptx *postgresTransactionAdapter) precommitQueryHighestAndUnversioned(ctx context.Context, loc ObjectLocation) (highest Version, unversionedExists bool, err error) {
defer mon.Task()(&ctx)(&err)
if err := loc.Verify(); err != nil {
return 0, false, Error.Wrap(err)
}
var version sql.NullInt64
err = ptx.tx.QueryRowContext(ctx, `
SELECT
(
SELECT version
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3)
ORDER BY version DESC
LIMIT 1
),
(
SELECT EXISTS (
SELECT 1
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3) AND
status IN `+statusesUnversioned+`
)
)
`, loc.ProjectID, []byte(loc.BucketName), loc.ObjectKey).Scan(&version, &unversionedExists)
if err != nil {
return 0, false, Error.Wrap(err)
}
if version.Valid {
highest = Version(version.Int64)
}
return highest, unversionedExists, nil
}
// precommitDeleteUnversioned deletes the unversioned object at loc and also returns the highest version.
func (ptx *postgresTransactionAdapter) precommitDeleteUnversioned(ctx context.Context, loc ObjectLocation) (result precommitConstraintResult, err error) {
defer mon.Task()(&ctx)(&err)
if err := loc.Verify(); err != nil {
return precommitConstraintResult{}, Error.Wrap(err)
}
var deleted Object
// TODO(ver): this scanning can probably simplified somehow.
var version sql.NullInt64
var streamID uuid.NullUUID
var createdAt sql.NullTime
var segmentCount, fixedSegmentSize sql.NullInt32
var totalPlainSize, totalEncryptedSize sql.NullInt64
var status sql.NullByte
var encryptionParams nullableValue[encryptionParameters]
encryptionParams.value.EncryptionParameters = &deleted.Encryption
err = ptx.tx.QueryRowContext(ctx, `
WITH highest_object AS (
SELECT version
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3)
ORDER BY version DESC
LIMIT 1
), deleted_objects AS (
DELETE FROM objects
WHERE
(project_id, bucket_name, object_key) = ($1, $2, $3)
AND status IN `+statusesUnversioned+`
RETURNING
version, stream_id,
created_at, expires_at,
status, segment_count,
encrypted_metadata_nonce, encrypted_metadata, encrypted_metadata_encrypted_key,
total_plain_size, total_encrypted_size, fixed_segment_size,
encryption
), deleted_segments AS (
DELETE FROM segments
WHERE segments.stream_id IN (SELECT deleted_objects.stream_id FROM deleted_objects)
RETURNING segments.stream_id
)
SELECT
(SELECT version FROM deleted_objects),
(SELECT stream_id FROM deleted_objects),
(SELECT created_at FROM deleted_objects),
(SELECT expires_at FROM deleted_objects),
(SELECT status FROM deleted_objects),
(SELECT segment_count FROM deleted_objects),
(SELECT encrypted_metadata_nonce FROM deleted_objects),
(SELECT encrypted_metadata FROM deleted_objects),
(SELECT encrypted_metadata_encrypted_key FROM deleted_objects),
(SELECT total_plain_size FROM deleted_objects),
(SELECT total_encrypted_size FROM deleted_objects),
(SELECT fixed_segment_size FROM deleted_objects),
(SELECT encryption FROM deleted_objects),
(SELECT count(*) FROM deleted_objects),
(SELECT count(*) FROM deleted_segments),
coalesce((SELECT version FROM highest_object), 0)
`, loc.ProjectID, []byte(loc.BucketName), loc.ObjectKey).
Scan(
&version,
&streamID,
&createdAt,
&deleted.ExpiresAt,
&status,
&segmentCount,
&deleted.EncryptedMetadataNonce,
&deleted.EncryptedMetadata,
&deleted.EncryptedMetadataEncryptedKey,
&totalPlainSize,
&totalEncryptedSize,
&fixedSegmentSize,
&encryptionParams,
&result.DeletedObjectCount,
&result.DeletedSegmentCount,
&result.HighestVersion,
)
if err != nil {
return precommitConstraintResult{}, Error.Wrap(err)
}
deleted.ProjectID = loc.ProjectID
deleted.BucketName = loc.BucketName
deleted.ObjectKey = loc.ObjectKey
deleted.Version = Version(version.Int64)
deleted.Status = ObjectStatus(status.Byte)
deleted.StreamID = streamID.UUID
deleted.CreatedAt = createdAt.Time
deleted.SegmentCount = segmentCount.Int32
deleted.TotalPlainSize = totalPlainSize.Int64
deleted.TotalEncryptedSize = totalEncryptedSize.Int64
deleted.FixedSegmentSize = fixedSegmentSize.Int32
if result.DeletedObjectCount > 1 {
ptx.postgresAdapter.log.Error("object with multiple committed versions were found!",
zap.Stringer("Project ID", loc.ProjectID), zap.String("Bucket Name", loc.BucketName),
zap.ByteString("Object Key", []byte(loc.ObjectKey)), zap.Int("deleted", result.DeletedObjectCount))
mon.Meter("multiple_committed_versions").Mark(1)
return result, Error.New("internal error: multiple committed unversioned objects")
}
if result.DeletedObjectCount > 0 {
result.Deleted = append(result.Deleted, deleted)
}
return result, nil
}
type precommitConstraintWithNonPendingResult struct {
Deleted []Object
// DeletedObjectCount returns how many objects were deleted.
DeletedObjectCount int
// DeletedSegmentCount returns how many segments were deleted.
DeletedSegmentCount int
// HighestVersion returns tha highest version that was present in the table.
// It returns 0 if there was none.
HighestVersion Version
// HighestNonPendingVersion returns tha highest non-pending version that was present in the table.
// It returns 0 if there was none.
HighestNonPendingVersion Version
}
func (r *precommitConstraintWithNonPendingResult) submitMetrics() {
mon.Meter("object_delete").Mark(r.DeletedObjectCount)
mon.Meter("segment_delete").Mark(r.DeletedSegmentCount)
}
// precommitDeleteUnversionedWithNonPending deletes the unversioned object at loc and also returns the highest version and highest committed version.
func (db *DB) precommitDeleteUnversionedWithNonPending(ctx context.Context, loc ObjectLocation, tx stmtRow) (result precommitConstraintWithNonPendingResult, err error) {
defer mon.Task()(&ctx)(&err)
if err := loc.Verify(); err != nil {
return precommitConstraintWithNonPendingResult{}, Error.Wrap(err)
}
var deleted Object
// TODO(ver): this scanning can probably simplified somehow.
var version sql.NullInt64
var streamID uuid.NullUUID
var createdAt sql.NullTime
var segmentCount, fixedSegmentSize sql.NullInt32
var totalPlainSize, totalEncryptedSize sql.NullInt64
var status sql.NullByte
var encryptionParams nullableValue[encryptionParameters]
encryptionParams.value.EncryptionParameters = &deleted.Encryption
err = tx.QueryRowContext(ctx, `
WITH highest_object AS (
SELECT version
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3)
ORDER BY version DESC
LIMIT 1
), highest_non_pending_object AS (
SELECT version
FROM objects
WHERE (project_id, bucket_name, object_key) = ($1, $2, $3)
AND status <> `+statusPending+`
ORDER BY version DESC
LIMIT 1
), deleted_objects AS (
DELETE FROM objects
WHERE
(project_id, bucket_name, object_key) = ($1, $2, $3)
AND status IN `+statusesUnversioned+`
RETURNING
version, stream_id,
created_at, expires_at,
status, segment_count,
encrypted_metadata_nonce, encrypted_metadata, encrypted_metadata_encrypted_key,
total_plain_size, total_encrypted_size, fixed_segment_size,
encryption
), deleted_segments AS (
DELETE FROM segments
WHERE segments.stream_id IN (SELECT deleted_objects.stream_id FROM deleted_objects)
RETURNING segments.stream_id
)
SELECT
(SELECT version FROM deleted_objects),
(SELECT stream_id FROM deleted_objects),
(SELECT created_at FROM deleted_objects),
(SELECT expires_at FROM deleted_objects),
(SELECT status FROM deleted_objects),
(SELECT segment_count FROM deleted_objects),
(SELECT encrypted_metadata_nonce FROM deleted_objects),
(SELECT encrypted_metadata FROM deleted_objects),
(SELECT encrypted_metadata_encrypted_key FROM deleted_objects),
(SELECT total_plain_size FROM deleted_objects),
(SELECT total_encrypted_size FROM deleted_objects),
(SELECT fixed_segment_size FROM deleted_objects),
(SELECT encryption FROM deleted_objects),
(SELECT count(*) FROM deleted_objects),
(SELECT count(*) FROM deleted_segments),
coalesce((SELECT version FROM highest_object), 0),
coalesce((SELECT version FROM highest_non_pending_object), 0)
`, loc.ProjectID, []byte(loc.BucketName), loc.ObjectKey).
Scan(
&version,
&streamID,
&createdAt,
&deleted.ExpiresAt,
&status,
&segmentCount,
&deleted.EncryptedMetadataNonce,
&deleted.EncryptedMetadata,
&deleted.EncryptedMetadataEncryptedKey,
&totalPlainSize,
&totalEncryptedSize,
&fixedSegmentSize,
&encryptionParams,
&result.DeletedObjectCount,
&result.DeletedSegmentCount,
&result.HighestVersion,
&result.HighestNonPendingVersion,
)
if err != nil {
return precommitConstraintWithNonPendingResult{}, Error.Wrap(err)
}
deleted.ProjectID = loc.ProjectID
deleted.BucketName = loc.BucketName
deleted.ObjectKey = loc.ObjectKey
deleted.Version = Version(version.Int64)
deleted.Status = ObjectStatus(status.Byte)
deleted.StreamID = streamID.UUID
deleted.CreatedAt = createdAt.Time
deleted.SegmentCount = segmentCount.Int32
deleted.TotalPlainSize = totalPlainSize.Int64
deleted.TotalEncryptedSize = totalEncryptedSize.Int64
deleted.FixedSegmentSize = fixedSegmentSize.Int32
if result.DeletedObjectCount > 1 {
db.log.Error("object with multiple committed versions were found!",
zap.Stringer("Project ID", loc.ProjectID), zap.String("Bucket Name", loc.BucketName),
zap.ByteString("Object Key", []byte(loc.ObjectKey)), zap.Int("deleted", result.DeletedObjectCount))
mon.Meter("multiple_committed_versions").Mark(1)
return result, Error.New("internal error: multiple committed unversioned objects")
}
if result.DeletedObjectCount > 0 {
result.Deleted = append(result.Deleted, deleted)
}
return result, nil
}