simplify the Get()/GetMultiple() re-use GetRaw() for both (minio#179)

Remember GetMultiple() must be used if your target is calling
PutMultiple(), without that the multiple events will not be
replayed.

Author: harshavardhana

internal/store/queuestore.go

@@ -251,61 +251,21 @@ func (store *QueueStore[I]) GetRaw(key Key) (raw []byte, err error) {
 
 // Get - gets an item from the store.
 func (store *QueueStore[I]) Get(key Key) (item I, err error) {
-	store.RLock()
-
-	defer func(store *QueueStore[I]) {
-		store.RUnlock()
-		if err != nil && !os.IsNotExist(err) {
-			// Upon error we remove the entry.
-			store.Del(key)
-		}
-	}(store)
-
-	var eventData []byte
-	eventData, err = os.ReadFile(filepath.Join(store.directory, key.String()))
+	items, err := store.GetMultiple(key)
 	if err != nil {
 		return item, err
 	}
-
-	if len(eventData) == 0 {
-		return item, os.ErrNotExist
-	}
-
-	if err = json.Unmarshal(eventData, &item); err != nil {
-		return item, err
-	}
-
-	return item, nil
+	return items[0], nil
 }
 
 // GetMultiple will read the multi payload file and fetch the items
 func (store *QueueStore[I]) GetMultiple(key Key) (items []I, err error) {
-	store.RLock()
-
-	defer func(store *QueueStore[I]) {
-		store.RUnlock()
-		if err != nil && !os.IsNotExist(err) {
-			// Upon error we remove the entry.
-			store.Del(key)
-		}
-	}(store)
-
-	raw, err := os.ReadFile(filepath.Join(store.directory, key.String()))
+	raw, err := store.GetRaw(key)
 	if err != nil {
-		return
-	}
-
-	var decoder *jsoniter.Decoder
-	if key.Compress {
-		decodedBytes, err := s2.Decode(nil, raw)
-		if err != nil {
-			return nil, err
-		}
-		decoder = jsoniter.ConfigCompatibleWithStandardLibrary.NewDecoder(bytes.NewReader(decodedBytes))
-	} else {
-		decoder = jsoniter.ConfigCompatibleWithStandardLibrary.NewDecoder(bytes.NewReader(raw))
+		return nil, err
 	}
 
+	decoder := jsoniter.ConfigCompatibleWithStandardLibrary.NewDecoder(bytes.NewReader(raw))
 	for decoder.More() {
 		var item I
 		if err := decoder.Decode(&item); err != nil {

internal/store/queuestore_test.go

@@ -18,11 +18,15 @@
 package store
 
 import (
+	"bytes"
 	"fmt"
 	"os"
 	"path/filepath"
 	"reflect"
 	"testing"
+
+	jsoniter "github.com/json-iterator/go"
+	"github.com/valyala/bytebufferpool"
 )
 
 type TestItem struct {
@@ -221,6 +225,72 @@ func TestQueueStoreListN(t *testing.T) {
 	}
 }
 
+func TestMultiplePutGetRaw(t *testing.T) {
+	defer func() {
+		if err := tearDownQueueStore(); err != nil {
+			t.Fatalf("Failed to tear down store; %v", err)
+		}
+	}()
+	store, err := setUpQueueStore(queueDir, 10)
+	if err != nil {
+		t.Fatalf("Failed to create a queue store; %v", err)
+	}
+	// TestItem{Name: "test-item", Property: "property"}
+	var items []TestItem
+	for i := 0; i < 10; i++ {
+		items = append(items, TestItem{
+			Name:     fmt.Sprintf("test-item-%d", i),
+			Property: "property",
+		})
+	}
+
+	buf := bytebufferpool.Get()
+	defer bytebufferpool.Put(buf)
+
+	enc := jsoniter.ConfigCompatibleWithStandardLibrary.NewEncoder(buf)
+	for i := range items {
+		if err = enc.Encode(items[i]); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if _, err := store.PutMultiple(items); err != nil {
+		t.Fatalf("failed to put multiple; %v", err)
+	}
+
+	keys := store.List()
+	if len(keys) != 1 {
+		t.Fatalf("expected len(keys)=1, but found %d", len(keys))
+	}
+
+	key := keys[0]
+	if !key.Compress {
+		t.Fatal("expected the item to be compressed")
+	}
+	if key.ItemCount != 10 {
+		t.Fatalf("expected itemcount=10 but found %v", key.ItemCount)
+	}
+
+	raw, err := store.GetRaw(key)
+	if err != nil {
+		t.Fatalf("unable to get multiple items; %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), raw) {
+		t.Fatalf("expected bytes: %d vs read bytes is wrong %d", len(buf.Bytes()), len(raw))
+	}
+
+	if err := store.Del(key); err != nil {
+		t.Fatalf("unable to Del; %v", err)
+	}
+
+	// Re-list
+	keys = store.List()
+	if len(keys) > 0 || err != nil {
+		t.Fatalf("Expected List() to return empty list and no error, got %v err: %v", keys, err)
+	}
+}
+
 func TestMultiplePutGets(t *testing.T) {
 	defer func() {
 		if err := tearDownQueueStore(); err != nil {