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store.go
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store.go
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package store
import (
"context"
"io"
"github.com/jackc/pgx/v5"
"github.com/pkg/errors"
"github.com/stackrox/rox/central/blob/datastore/store/postgres"
"github.com/stackrox/rox/generated/storage"
"github.com/stackrox/rox/pkg/logging"
pgPkg "github.com/stackrox/rox/pkg/postgres"
"github.com/stackrox/rox/pkg/sac"
"github.com/stackrox/rox/pkg/sac/resources"
)
var (
log = logging.LoggerForModule()
scopeChecker = sac.ForResource(resources.Administration)
)
// Store is the interface to interact with the storage for storage.Blob
type Store interface {
Upsert(ctx context.Context, obj *storage.Blob, reader io.Reader) error
Get(ctx context.Context, name string, writer io.Writer) (*storage.Blob, bool, error)
Delete(ctx context.Context, name string) error
GetIDs(ctx context.Context) ([]string, error)
GetMetadata(ctx context.Context, name string) (*storage.Blob, bool, error)
}
type storeImpl struct {
db pgPkg.DB
store postgres.Store
}
// New creates a new Blob store
func New(db pgPkg.DB) Store {
return &storeImpl{
db: db,
store: postgres.New(db),
}
}
func wrapRollback(ctx context.Context, tx *pgPkg.Tx, err error) error {
rollbackErr := tx.Rollback(ctx)
if rollbackErr != nil {
return errors.Wrapf(rollbackErr, "rolling back due to err: %v", err)
}
return err
}
// Upsert adds a blob to the database
func (s *storeImpl) Upsert(ctx context.Context, obj *storage.Blob, reader io.Reader) error {
if err := sac.VerifyAuthzOK(scopeChecker.WriteAllowed(ctx)); err != nil {
return err
}
// Augment permission because we require read permission internally
ctx = sac.WithGlobalAccessScopeChecker(ctx,
sac.AllowFixedScopes(
sac.AccessModeScopeKeys(storage.Access_READ_ACCESS, storage.Access_READ_WRITE_ACCESS),
sac.ResourceScopeKeys(resources.Administration)))
tx, err := s.db.Begin(ctx)
if err != nil {
return err
}
ctx = pgPkg.ContextWithTx(ctx, tx)
existingBlob, exists, err := s.store.Get(ctx, obj.GetName())
if err != nil {
return wrapRollback(ctx, tx, err)
}
los := tx.LargeObjects()
var lo *pgx.LargeObject
if exists {
lo, err = los.Open(ctx, existingBlob.GetOid(), pgx.LargeObjectModeWrite)
if err != nil {
return wrapRollback(ctx, tx, errors.Wrapf(err, "opening blob with oid %d", existingBlob.GetOid()))
}
if err := lo.Truncate(0); err != nil {
return wrapRollback(ctx, tx, errors.Wrapf(err, "truncating blob with oid %d", existingBlob.GetOid()))
}
obj.Oid = existingBlob.GetOid()
} else {
oid, err := los.Create(ctx, 0)
if err != nil {
return wrapRollback(ctx, tx, errors.Wrap(err, "error creating new blob"))
}
lo, err = los.Open(ctx, oid, pgx.LargeObjectModeWrite)
if err != nil {
return wrapRollback(ctx, tx, errors.Wrapf(err, "opening blob with oid %d", oid))
}
obj.Oid = oid
}
buf := make([]byte, 1024*1024)
var totalRead int64
for {
nRead, err := reader.Read(buf)
totalRead += int64(nRead)
if nRead != 0 {
if _, err := lo.Write(buf[:nRead]); err != nil {
return wrapRollback(ctx, tx, errors.Wrap(err, "writing blob"))
}
}
// nRead can be non-zero when err == io.EOF
if err != nil {
if err == io.EOF {
break
}
return wrapRollback(ctx, tx, errors.Wrap(err, "reading buffer to write for blob"))
}
}
if err := lo.Close(); err != nil {
return wrapRollback(ctx, tx, errors.Wrap(err, "closing large object for blob"))
}
if totalRead != obj.GetLength() {
return wrapRollback(ctx, tx, errors.Errorf("Blob metadata mismatch. Blob metadata shows %d in length, but data has length of %d", obj.GetLength(), totalRead))
}
if err := s.store.Upsert(ctx, obj); err != nil {
return wrapRollback(ctx, tx, errors.Wrapf(err, "error upserting blob %q", obj.GetName()))
}
return tx.Commit(ctx)
}
// Get returns a blob from the database
func (s *storeImpl) Get(ctx context.Context, name string, writer io.Writer) (*storage.Blob, bool, error) {
tx, err := s.db.Begin(ctx)
if err != nil {
return nil, false, err
}
ctx = pgPkg.ContextWithTx(ctx, tx)
existingBlob, exists, err := s.store.Get(ctx, name)
if err != nil || !exists {
return nil, exists, wrapRollback(ctx, tx, err)
}
los := tx.LargeObjects()
lo, err := los.Open(ctx, existingBlob.GetOid(), pgx.LargeObjectModeRead)
if err != nil {
err := errors.Wrapf(err, "error opening large object with oid %d", existingBlob.GetOid())
return nil, false, wrapRollback(ctx, tx, err)
}
buf := make([]byte, 1024*1024)
var totalRead int64
for {
nRead, err := lo.Read(buf)
totalRead += int64(nRead)
// nRead can be non-zero when err == io.EOF
if nRead != 0 {
if _, err := writer.Write(buf[:nRead]); err != nil {
err := errors.Wrap(err, "error writing to output")
return nil, false, wrapRollback(ctx, tx, err)
}
}
if err != nil {
if err == io.EOF {
break
}
return nil, false, wrapRollback(ctx, tx, errors.Wrap(err, "reading blob"))
}
}
if err := lo.Close(); err != nil {
err = errors.Wrap(err, "closing large object for blob")
return nil, false, wrapRollback(ctx, tx, err)
}
if totalRead != existingBlob.GetLength() {
return nil, false, wrapRollback(ctx, tx, errors.Errorf("Blob %s corrupted. Blob metadata shows %d in length, but data has length of %d", existingBlob.GetName(), existingBlob.GetLength(), totalRead))
}
return existingBlob, true, tx.Commit(ctx)
}
// Delete removes a blob from database if it exists
func (s *storeImpl) Delete(ctx context.Context, name string) error {
if err := sac.VerifyAuthzOK(scopeChecker.WriteAllowed(ctx)); err != nil {
return err
}
// Augment permission because we require read permission internally
ctx = sac.WithGlobalAccessScopeChecker(ctx,
sac.AllowFixedScopes(
sac.AccessModeScopeKeys(storage.Access_READ_ACCESS, storage.Access_READ_WRITE_ACCESS),
sac.ResourceScopeKeys(resources.Administration)))
tx, err := s.db.Begin(ctx)
if err != nil {
return err
}
ctx = pgPkg.ContextWithTx(ctx, tx)
existingBlob, exists, err := s.store.Get(ctx, name)
if err != nil || !exists {
return wrapRollback(ctx, tx, err)
}
los := tx.LargeObjects()
if err = los.Unlink(ctx, existingBlob.GetOid()); err != nil {
return wrapRollback(ctx, tx, errors.Wrapf(err, "failed to remove large object with oid %d", existingBlob.GetOid()))
}
if err = s.store.Delete(ctx, name); err != nil {
err = errors.Wrapf(err, "deleting large object %s", name)
return wrapRollback(ctx, tx, err)
}
return tx.Commit(ctx)
}
// GetIDs all blob names
func (s *storeImpl) GetIDs(ctx context.Context) ([]string, error) {
return s.store.GetIDs(ctx)
}
// GetMetadata all blob names
func (s *storeImpl) GetMetadata(ctx context.Context, name string) (*storage.Blob, bool, error) {
return s.store.Get(ctx, name)
}