fix issue 4311

client/cache/cache_test.go

@@ -120,6 +120,20 @@ func TestCache(t *testing.T) {
 	if vv[1].(string) != "author1" {
 		t.Error("GetMulti ERROR")
 	}
+
+	vv, err = bm.GetMulti(context.Background(), []string{"astaxie0", "astaxie1"})
+	if len(vv) != 2 {
+		t.Error("GetMulti ERROR")
+	}
+	if vv[0] != nil {
+		t.Error("GetMulti ERROR")
+	}
+	if vv[1].(string) != "author1" {
+		t.Error("GetMulti ERROR")
+	}
+	if err != nil && err.Error() != "key [astaxie0] error: the key isn't exist" {
+		t.Error("GetMulti ERROR")
+	}
 }
 
 func TestFileCache(t *testing.T) {
@@ -189,5 +203,19 @@ func TestFileCache(t *testing.T) {
 		t.Error("GetMulti ERROR")
 	}
 
+	vv, err = bm.GetMulti(context.Background(), []string{"astaxie0", "astaxie1"})
+	if len(vv) != 2 {
+		t.Error("GetMulti ERROR")
+	}
+	if vv[0] != nil {
+		t.Error("GetMulti ERROR")
+	}
+	if vv[1].(string) != "author1" {
+		t.Error("GetMulti ERROR")
+	}
+	if err == nil {
+		t.Error("GetMulti ERROR")
+	}
+
 	os.RemoveAll("cache")
 }

client/cache/file.go

@@ -28,6 +28,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/pkg/errors"
@@ -144,18 +145,23 @@ func (fc *FileCache) Get(ctx context.Context, key string) (interface{}, error) {
 // GetMulti gets values from file cache.
 // if nonexistent or expired return an empty string.
 func (fc *FileCache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
-	var rc []interface{}
-	for _, key := range keys {
-		val, err := fc.Get(context.Background(), key)
+	rc := make([]interface{}, len(keys))
+	keysErr := make([]string, 0)
+
+	for i, ki := range keys {
+		val, err := fc.Get(context.Background(), ki)
 		if err != nil {
-			rc = append(rc, err)
-		} else {
-			rc = append(rc, val)
+			keysErr = append(keysErr, fmt.Sprintf("key [%s] error: %s", ki, err.Error()))
+			continue
+		}
+		rc[i] = val
 	}
 
-	}
+	if len(keysErr) == 0 {
 		return rc, nil
 	}
+	return rc, errors.New(strings.Join(keysErr, "; "))
+}
 
 // Put value into file cache.
 // timeout: how long this file should be kept in ms

client/cache/memcache/memcache.go

@@ -33,6 +33,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"strings"
 	"time"
 
@@ -68,21 +69,33 @@ func (rc *Cache) Get(ctx context.Context, key string) (interface{}, error) {
 
 // GetMulti gets a value from a key in memcache.
 func (rc *Cache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
-	var rv []interface{}
+	rv := make([]interface{}, len(keys))
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return rv, err
 		}
 	}
+
 	mv, err := rc.conn.GetMulti(keys)
-	if err == nil {
-		for _, v := range mv {
-			rv = append(rv, v.Value)
-		}
-	}
+	if err != nil {
 		return rv, err
 	}
 
+	keysErr := make([]string, 0)
+	for i, ki := range keys {
+		if _, ok := mv[ki]; !ok {
+			keysErr = append(keysErr, fmt.Sprintf("key [%s] error: %s", ki, "the key isn't exist"))
+			continue
+		}
+		rv[i] = mv[ki].Value
+	}
+
+	if len(keysErr) == 0 {
+		return rv, nil
+	}
+	return rv, fmt.Errorf(strings.Join(keysErr, "; "))
+}
+
 // Put puts a value into memcache.
 func (rc *Cache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	if rc.conn == nil {

client/cache/memcache/memcache_test.go

@@ -28,7 +28,6 @@ import (
 )
 
 func TestMemcacheCache(t *testing.T) {
-
 	addr := os.Getenv("MEMCACHE_ADDR")
 	if addr == "" {
 		addr = "127.0.0.1:11211"
@@ -114,6 +113,20 @@ func TestMemcacheCache(t *testing.T) {
 		t.Error("GetMulti ERROR")
 	}
 
+	vv, err = bm.GetMulti(context.Background(), []string{"astaxie0", "astaxie1"})
+	if len(vv) != 2 {
+		t.Error("GetMulti ERROR")
+	}
+	if vv[0] != nil {
+		t.Error("GetMulti ERROR")
+	}
+	if string(vv[1].([]byte)) != "author1" {
+		t.Error("GetMulti ERROR")
+	}
+	if err != nil && err.Error() == "key [astaxie0] error: key isn't exist" {
+		t.Error("GetMulti ERROR")
+	}
+
 	// test clear all
 	if err = bm.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")

client/cache/memory.go

@@ -18,6 +18,8 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
+	"strings"
 	"sync"
 	"time"
 )
@@ -68,23 +70,29 @@ func (bc *MemoryCache) Get(ctx context.Context, key string) (interface{}, error)
 		}
 		return itm.val, nil
 	}
-	return nil, nil
+	return nil, errors.New("the key isn't exist")
 }
 
 // GetMulti gets caches from memory.
 // If non-existent or expired, return nil.
 func (bc *MemoryCache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
-	var rc []interface{}
-	for _, name := range keys {
-		val, err := bc.Get(context.Background(), name)
+	rc := make([]interface{}, len(keys))
+	keysErr := make([]string, 0)
+
+	for i, ki := range keys {
+		val, err := bc.Get(context.Background(), ki)
 		if err != nil {
-			rc = append(rc, err)
-		} else {
-			rc = append(rc, val)
+			keysErr = append(keysErr, fmt.Sprintf("key [%s] error: %s", ki, err.Error()))
+			continue
 		}
+		rc[i] = val
 	}
+
+	if len(keysErr) == 0 {
 		return rc, nil
 	}
+	return rc, errors.New(strings.Join(keysErr, "; "))
+}
 
 // Put puts cache into memory.
 // If lifespan is 0, it will never overwrite this value unless restarted

client/cache/redis/redis_test.go

@@ -113,6 +113,14 @@ func TestRedisCache(t *testing.T) {
 		t.Error("GetMulti ERROR")
 	}
 
+	vv, err = bm.GetMulti(context.Background(), []string{"astaxie0", "astaxie1"})
+	if vv[0] != nil {
+		t.Error("GetMulti ERROR")
+	}
+	if v, _ := redis.String(vv[1], nil); v != "author1" {
+		t.Error("GetMulti ERROR")
+	}
+
 	// test clear all
 	if err = bm.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")

client/cache/ssdb/ssdb.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"strconv"
 	"strings"
 	"time"
@@ -41,23 +42,37 @@ func (rc *Cache) Get(ctx context.Context, key string) (interface{}, error) {
 // GetMulti gets one or keys values from ssdb.
 func (rc *Cache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
 	size := len(keys)
-	var values []interface{}
+	values := make([]interface{}, size)
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return values, err
 		}
 	}
+
 	res, err := rc.conn.Do("multi_get", keys)
+	if err != nil {
+		return values, err
+	}
+
 	resSize := len(res)
-	if err == nil {
+	keyIdx := make(map[string]int)
 	for i := 1; i < resSize; i += 2 {
-			values = append(values, res[i+1])
+		keyIdx[res[i]] = i
 	}
-		return values, nil
+
+	keysErr := make([]string, 0)
+	for i, ki := range keys {
+		if _, ok := keyIdx[ki]; !ok {
+			keysErr = append(keysErr, fmt.Sprintf("key [%s] error: %s", ki, "the key isn't exist"))
+			continue
 		}
-	for i := 0; i < size; i++ {
-		values = append(values, err)
+		values[i] = res[keyIdx[ki]+1]
 	}
+
+	if len(keysErr) != 0 {
+		return values, fmt.Errorf(strings.Join(keysErr, "; "))
+	}
+
 	return values, nil
 }
 

client/cache/ssdb/ssdb_test.go

@@ -106,6 +106,20 @@ func TestSsdbcacheCache(t *testing.T) {
 		t.Error("getmulti error")
 	}
 
+	vv, err = ssdb.GetMulti(context.Background(), []string{"ssdb", "ssdb11"})
+	if len(vv) != 2 {
+		t.Error("getmulti error")
+	}
+	if vv[0].(string) != "ssdb" {
+		t.Error("getmulti error")
+	}
+	if vv[1] != nil {
+		t.Error("getmulti error")
+	}
+	if err != nil && err.Error() != "key [ssdb11] error: the key isn't exist" {
+		t.Error("getmulti error")
+	}
+
 	// test clear all done
 	if err = ssdb.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")