feat(kv): clear RPC method which completely cleans storage

CHANGELOG.md

@@ -6,6 +6,7 @@ v2.3.1 (_.06.2021)
 ## 👀 New:
 
 - ✏️ Rework `broadcast` plugin. Add architecture diagrams to the `doc` folder. [PR](https://github.com/spiral/roadrunner/pull/732)
+- ✏️ Add `Clear` method to the KV plugin RPC. [PR](https://github.com/spiral/roadrunner/pull/736)
 
 ## 🩹 Fixes:
 

README.md

@@ -5,7 +5,6 @@
  <a href="https://packagist.org/packages/spiral/roadrunner"><img src="https://poser.pugx.org/spiral/roadrunner/version"></a>
 	<a href="https://pkg.go.dev/github.com/spiral/roadrunner/v2?tab=doc"><img src="https://godoc.org/github.com/spiral/roadrunner/v2?status.svg"></a>
 	<a href="https://github.com/spiral/roadrunner/actions"><img src="https://github.com/spiral/roadrunner/workflows/Linux/badge.svg" alt=""></a>
-	<a href="https://github.com/spiral/roadrunner/actions"><img src="https://github.com/spiral/roadrunner/workflows/Windows/badge.svg" alt=""></a>
 	<a href="https://github.com/spiral/roadrunner/actions"><img src="https://github.com/spiral/roadrunner/workflows/Linters/badge.svg" alt=""></a>
 	<a href="https://goreportcard.com/report/github.com/spiral/roadrunner"><img src="https://goreportcard.com/badge/github.com/spiral/roadrunner"></a>
 	<a href="https://scrutinizer-ci.com/g/spiral/roadrunner/?branch=master"><img src="https://scrutinizer-ci.com/g/spiral/roadrunner/badges/quality-score.png"></a>

plugins/kv/drivers/boltdb/driver.go

@@ -18,6 +18,7 @@ import (
 )
 
 type Driver struct {
+	clearMu sync.RWMutex
 	// db instance
 	DB *bolt.DB
 	// name should be UTF-8
@@ -373,6 +374,35 @@ func (d *Driver) TTL(keys ...string) (map[string]string, error) {
 	return m, nil
 }
 
+func (d *Driver) Clear() error {
+	err := d.DB.Update(func(tx *bolt.Tx) error {
+		err := tx.DeleteBucket(d.bucket)
+		if err != nil {
+			d.log.Error("boltdb delete bucket", "error", err)
+			return err
+		}
+
+		_, err = tx.CreateBucket(d.bucket)
+		if err != nil {
+			d.log.Error("boltdb create bucket", "error", err)
+			return err
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		d.log.Error("clear transaction failed", "error", err)
+		return err
+	}
+
+	d.clearMu.Lock()
+	d.gc = sync.Map{}
+	d.clearMu.Unlock()
+
+	return nil
+}
+
 // ========================= PRIVATE =================================
 
 func (d *Driver) startGCLoop() { //nolint:gocognit
@@ -382,6 +412,8 @@ func (d *Driver) startGCLoop() { //nolint:gocognit
 		for {
 			select {
 			case <-t.C:
+				d.clearMu.RLock()
+
 				// calculate current time before loop started to be fair
 				now := time.Now()
 				d.gc.Range(func(key, value interface{}) bool {
@@ -414,6 +446,8 @@ func (d *Driver) startGCLoop() { //nolint:gocognit
 					}
 					return true
 				})
+
+				d.clearMu.RUnlock()
 			case <-d.stop:
 				err := d.DB.Close()
 				if err != nil {

plugins/kv/drivers/memcached/driver.go

@@ -237,3 +237,13 @@ func (d *Driver) Delete(keys ...string) error {
 	}
 	return nil
 }
+
+func (d *Driver) Clear() error {
+	err := d.client.DeleteAll()
+	if err != nil {
+		d.log.Error("flush_all operation failed", "error", err)
+		return err
+	}
+
+	return nil
+}

plugins/kv/interface.go

@@ -22,9 +22,12 @@ type Storage interface {
 	MExpire(items ...*kvv1.Item) error
 
 	// TTL return the rest time to live for provided keys
-	// Not supported for the memcached and boltdb
+	// Not supported for the memcached
 	TTL(keys ...string) (map[string]string, error)
 
+	// Clear clean the entire storage
+	Clear() error
+
 	// Delete one or multiple keys.
 	Delete(keys ...string) error
 }

plugins/kv/rpc.go

@@ -161,3 +161,19 @@ func (r *rpc) Delete(in *kvv1.Request, _ *kvv1.Response) error {
 
 	return errors.E(op, errors.Errorf("no such storage: %s", in.GetStorage()))
 }
+
+// Clear clean the storage
+func (r *rpc) Clear(in *kvv1.Request, _ *kvv1.Response) error {
+	const op = errors.Op("rcp_delete")
+
+	if st, exists := r.storages[in.GetStorage()]; exists {
+		err := st.Clear()
+		if err != nil {
+			return errors.E(op, err)
+		}
+
+		return nil
+	}
+
+	return errors.E(op, errors.Errorf("no such storage: %s", in.GetStorage()))
+}

plugins/memory/kv.go

@@ -13,7 +13,8 @@ import (
 )
 
 type Driver struct {
-	heap sync.Map
+	clearMu sync.RWMutex
+	heap    sync.Map
 	// stop is used to stop keys GC and close boltdb connection
 	stop chan struct{}
 	log  logger.Logger
@@ -203,6 +204,14 @@ func (s *Driver) Delete(keys ...string) error {
 	return nil
 }
 
+func (s *Driver) Clear() error {
+	s.clearMu.Lock()
+	s.heap = sync.Map{}
+	s.clearMu.Unlock()
+
+	return nil
+}
+
 // ================================== PRIVATE ======================================
 
 func (s *Driver) gc() {
@@ -213,6 +222,9 @@ func (s *Driver) gc() {
 			ticker.Stop()
 			return
 		case now := <-ticker.C:
+			// mutes needed to clear the map
+			s.clearMu.RLock()
+
 			// check every second
 			s.heap.Range(func(key, value interface{}) bool {
 				v := value.(*kvv1.Item)
@@ -231,6 +243,8 @@ func (s *Driver) gc() {
 				}
 				return true
 			})
+
+			s.clearMu.RUnlock()
 		}
 	}
 }

plugins/redis/kv.go

@@ -240,3 +240,12 @@ func (d *Driver) TTL(keys ...string) (map[string]string, error) {
 	}
 	return m, nil
 }
+
+func (d *Driver) Clear() error {
+	fdb := d.universalClient.FlushDB(context.Background())
+	if fdb.Err() != nil {
+		return fdb.Err()
+	}
+
+	return nil
+}

tests/plugins/broadcast/broadcast_plugin_test.go

@@ -205,7 +205,8 @@ func TestBroadcastSameSubscriber(t *testing.T) {
 		cfg,
 		&broadcast.Plugin{},
 		&rpcPlugin.Plugin{},
-		mockLogger,
+		&logger.ZapLogger{},
+		// mockLogger,
 		&server.Plugin{},
 		&redis.Plugin{},
 		&websockets.Plugin{},
@@ -314,7 +315,8 @@ func TestBroadcastSameSubscriberGlobal(t *testing.T) {
 		cfg,
 		&broadcast.Plugin{},
 		&rpcPlugin.Plugin{},
-		mockLogger,
+		&logger.ZapLogger{},
+		// mockLogger,
 		&server.Plugin{},
 		&redis.Plugin{},
 		&websockets.Plugin{},