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Move GetMeta storage API to separate interface

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This commit is contained in:
Daniel 2021-05-12 15:36:35 +02:00
parent a41ea62d2d
commit 5dc39685da
2 changed files with 26 additions and 8 deletions
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28
database/controller.go
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@ -55,7 +55,7 @@ func (c *Controller) Get(key string) (record.Record, error) {
r, err := c.storage.Get(key)
if err != nil {
// replace not found error
if err == storage.ErrNotFound {
if errors.Is(err, storage.ErrNotFound) {
return nil, ErrNotFound
}
return nil, err
@ -82,13 +82,27 @@ func (c *Controller) GetMeta(key string) (*record.Meta, error) {
return nil, ErrShuttingDown
}
m, err := c.storage.GetMeta(key)
if err != nil {
// replace not found error
if err == storage.ErrNotFound {
return nil, ErrNotFound
var m *record.Meta
var err error
if metaDB, ok := c.storage.(storage.MetaHandler); ok {
m, err = metaDB.GetMeta(key)
if err != nil {
// replace not found error
if errors.Is(err, storage.ErrNotFound) {
return nil, ErrNotFound
}
return nil, err
}
return nil, err
} else {
r, err := c.storage.Get(key)
if err != nil {
// replace not found error
if errors.Is(err, storage.ErrNotFound) {
return nil, ErrNotFound
}
return nil, err
}
m = r.Meta()
}
if !m.CheckValidity() {

6
database/storage/interface.go
View file

@ -13,7 +13,6 @@ import (
type Interface interface {
// Primary Interface
Get(key string) (record.Record, error)
GetMeta(key string) (*record.Meta, error)
Put(m record.Record) (record.Record, error)
Delete(key string) error
Query(q *query.Query, local, internal bool) (*iterator.Iterator, error)
@ -27,6 +26,11 @@ type Interface interface {
MaintainRecordStates(ctx context.Context, purgeDeletedBefore time.Time, shadowDelete bool) error
}
// Maintainer defines the database storage API for backends that support optimized fetching of only the metadata.
type MetaHandler interface {
GetMeta(key string) (*record.Meta, error)
}
// Maintainer defines the database storage API for backends that require regular maintenance.
type Maintainer interface {
Maintain(ctx context.Context) error