Add context to cache API

pkg/client/cache/cache.go

@@ -32,6 +32,7 @@
 package cache
 
 import (
+	"context"
 	"fmt"
 	"time"
 )
@@ -48,21 +49,21 @@ import (
 //	count := c.Get("counter").(int)
 type Cache interface {
 	// Get a cached value by key.
-	Get(key string) interface{}
+	Get(ctx context.Context, key string) (interface{}, error)
 	// GetMulti is a batch version of Get.
-	GetMulti(keys []string) []interface{}
+	GetMulti(ctx context.Context, keys []string) ([]interface{}, error)
 	// Set a cached value with key and expire time.
-	Put(key string, val interface{}, timeout time.Duration) error
+	Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error
 	// Delete cached value by key.
-	Delete(key string) error
+	Delete(ctx context.Context, key string) error
 	// Increment a cached int value by key, as a counter.
-	Incr(key string) error
+	Incr(ctx context.Context, key string) error
 	// Decrement a cached int value by key, as a counter.
-	Decr(key string) error
+	Decr(ctx context.Context, key string) error
 	// Check if a cached value exists or not.
-	IsExist(key string) bool
+	IsExist(ctx context.Context, key string) (bool, error)
 	// Clear all cache.
-	ClearAll() error
+	ClearAll(ctx context.Context) error
 	// Start gc routine based on config string settings.
 	StartAndGC(config string) error
 }

pkg/client/cache/cache_test.go

@@ -15,6 +15,7 @@
 package cache
 
 import (
+	"context"
 	"os"
 	"sync"
 	"testing"
@@ -26,19 +27,20 @@ func TestCacheIncr(t *testing.T) {
 	if err != nil {
 		t.Error("init err")
 	}
-	//timeoutDuration := 10 * time.Second
+	// timeoutDuration := 10 * time.Second
 
-	bm.Put("edwardhey", 0, time.Second*20)
+	bm.Put(context.Background(), "edwardhey", 0, time.Second*20)
 	wg := sync.WaitGroup{}
 	wg.Add(10)
 	for i := 0; i < 10; i++ {
 		go func() {
 			defer wg.Done()
-			bm.Incr("edwardhey")
+			bm.Incr(context.Background(), "edwardhey")
 		}()
 	}
 	wg.Wait()
-	if bm.Get("edwardhey").(int) != 10 {
+	val, _ := bm.Get(context.Background(), "edwardhey")
+	if val.(int) != 10 {
 		t.Error("Incr err")
 	}
 }
@@ -49,66 +51,66 @@ func TestCache(t *testing.T) {
 		t.Error("init err")
 	}
 	timeoutDuration := 10 * time.Second
-	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 1 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
 		t.Error("get err")
 	}
 
 	time.Sleep(30 * time.Second)
 
-	if bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("check err")
 	}
 
-	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
 
-	if err = bm.Incr("astaxie"); err != nil {
+	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
 		t.Error("Incr Error", err)
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 2 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 2 {
 		t.Error("get err")
 	}
 
-	if err = bm.Decr("astaxie"); err != nil {
+	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
 		t.Error("Decr Error", err)
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 1 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
 		t.Error("get err")
 	}
-	bm.Delete("astaxie")
-	if bm.IsExist("astaxie") {
+	bm.Delete(context.Background(), "astaxie")
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
 	}
 
-	//test GetMulti
-	if err = bm.Put("astaxie", "author", timeoutDuration); err != nil {
+	// test GetMulti
+	if err = bm.Put(context.Background(), "astaxie", "author", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
-	if v := bm.Get("astaxie"); v.(string) != "author" {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(string) != "author" {
 		t.Error("get err")
 	}
 
-	if err = bm.Put("astaxie1", "author1", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie1", "author1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie1") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie1"); !res {
 		t.Error("check err")
 	}
 
-	vv := bm.GetMulti([]string{"astaxie", "astaxie1"})
+	vv, _ := bm.GetMulti(context.Background(), []string{"astaxie", "astaxie1"})
 	if len(vv) != 2 {
 		t.Error("GetMulti ERROR")
 	}
@@ -126,57 +128,57 @@ func TestFileCache(t *testing.T) {
 		t.Error("init err")
 	}
 	timeoutDuration := 10 * time.Second
-	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 1 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
 		t.Error("get err")
 	}
 
-	if err = bm.Incr("astaxie"); err != nil {
+	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
 		t.Error("Incr Error", err)
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 2 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 2 {
 		t.Error("get err")
 	}
 
-	if err = bm.Decr("astaxie"); err != nil {
+	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
 		t.Error("Decr Error", err)
 	}
 
-	if v := bm.Get("astaxie"); v.(int) != 1 {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
 		t.Error("get err")
 	}
-	bm.Delete("astaxie")
-	if bm.IsExist("astaxie") {
+	bm.Delete(context.Background(), "astaxie")
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
 	}
 
-	//test string
-	if err = bm.Put("astaxie", "author", timeoutDuration); err != nil {
+	// test string
+	if err = bm.Put(context.Background(), "astaxie", "author", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
-	if v := bm.Get("astaxie"); v.(string) != "author" {
+	if v, _ := bm.Get(context.Background(), "astaxie"); v.(string) != "author" {
 		t.Error("get err")
 	}
 
-	//test GetMulti
-	if err = bm.Put("astaxie1", "author1", timeoutDuration); err != nil {
+	// test GetMulti
+	if err = bm.Put(context.Background(), "astaxie1", "author1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie1") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie1"); !res {
 		t.Error("check err")
 	}
 
-	vv := bm.GetMulti([]string{"astaxie", "astaxie1"})
+	vv, _ := bm.GetMulti(context.Background(), []string{"astaxie", "astaxie1"})
 	if len(vv) != 2 {
 		t.Error("GetMulti ERROR")
 	}

pkg/client/cache/file.go

@@ -16,6 +16,7 @@ package cache
 
 import (
 	"bytes"
+	"context"
 	"crypto/md5"
 	"encoding/gob"
 	"encoding/hex"
@@ -28,6 +29,8 @@ import (
 	"reflect"
 	"strconv"
 	"time"
+
+	"github.com/pkg/errors"
 )
 
 // FileCacheItem is basic unit of file cache adapter which
@@ -120,33 +123,44 @@ func (fc *FileCache) getCacheFileName(key string) string {
 
 // Get value from file cache.
 // if nonexistent or expired return an empty string.
-func (fc *FileCache) Get(key string) interface{} {
+func (fc *FileCache) Get(ctx context.Context, key string) (interface{}, error) {
 	fileData, err := FileGetContents(fc.getCacheFileName(key))
 	if err != nil {
-		return ""
+		return nil, err
 	}
+
 	var to FileCacheItem
-	GobDecode(fileData, &to)
-	if to.Expired.Before(time.Now()) {
-		return ""
+	err = GobDecode(fileData, &to)
+	if err != nil {
+		return nil, err
 	}
-	return to.Data
+
+	if to.Expired.Before(time.Now()) {
+		return nil, errors.New("The key is expired")
+	}
+	return to.Data, nil
 }
 
 // GetMulti gets values from file cache.
 // if nonexistent or expired return an empty string.
-func (fc *FileCache) GetMulti(keys []string) []interface{} {
+func (fc *FileCache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
 	var rc []interface{}
 	for _, key := range keys {
-		rc = append(rc, fc.Get(key))
+		val, err := fc.Get(context.Background(), key)
+		if err != nil {
+			rc = append(rc, err)
+		} else {
+			rc = append(rc, val)
 		}
-	return rc
+
+	}
+	return rc, nil
 }
 
 // Put value into file cache.
 // timeout: how long this file should be kept in ms
 // if timeout equals fc.EmbedExpiry(default is 0), cache this item forever.
-func (fc *FileCache) Put(key string, val interface{}, timeout time.Duration) error {
+func (fc *FileCache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	gob.Register(val)
 
 	item := FileCacheItem{Data: val}
@@ -164,7 +178,7 @@ func (fc *FileCache) Put(key string, val interface{}, timeout time.Duration) err
 }
 
 // Delete file cache value.
-func (fc *FileCache) Delete(key string) error {
+func (fc *FileCache) Delete(ctx context.Context, key string) error {
 	filename := fc.getCacheFileName(key)
 	if ok, _ := exists(filename); ok {
 		return os.Remove(filename)
@@ -174,39 +188,39 @@ func (fc *FileCache) Delete(key string) error {
 
 // Incr increases cached int value.
 // fc value is saved forever unless deleted.
-func (fc *FileCache) Incr(key string) error {
-	data := fc.Get(key)
+func (fc *FileCache) Incr(ctx context.Context, key string) error {
+	data, _ := fc.Get(context.Background(), key)
 	var incr int
 	if reflect.TypeOf(data).Name() != "int" {
 		incr = 0
 	} else {
 		incr = data.(int) + 1
 	}
-	fc.Put(key, incr, time.Duration(fc.EmbedExpiry))
+	fc.Put(context.Background(), key, incr, time.Duration(fc.EmbedExpiry))
 	return nil
 }
 
 // Decr decreases cached int value.
-func (fc *FileCache) Decr(key string) error {
-	data := fc.Get(key)
+func (fc *FileCache) Decr(ctx context.Context, key string) error {
+	data, _ := fc.Get(context.Background(), key)
 	var decr int
 	if reflect.TypeOf(data).Name() != "int" || data.(int)-1 <= 0 {
 		decr = 0
 	} else {
 		decr = data.(int) - 1
 	}
-	fc.Put(key, decr, time.Duration(fc.EmbedExpiry))
+	fc.Put(context.Background(), key, decr, time.Duration(fc.EmbedExpiry))
 	return nil
 }
 
 // IsExist checks if value exists.
-func (fc *FileCache) IsExist(key string) bool {
+func (fc *FileCache) IsExist(ctx context.Context, key string) (bool, error) {
 	ret, _ := exists(fc.getCacheFileName(key))
-	return ret
+	return ret, nil
 }
 
 // ClearAll cleans cached files (not implemented)
-func (fc *FileCache) ClearAll() error {
+func (fc *FileCache) ClearAll(context.Context) error {
 	return nil
 }
 

pkg/client/cache/memcache/memcache.go

@@ -30,6 +30,7 @@
 package memcache
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"strings"
@@ -52,28 +53,25 @@ func NewMemCache() cache.Cache {
 }
 
 // Get get value from memcache.
-func (rc *Cache) Get(key string) interface{} {
+func (rc *Cache) Get(ctx context.Context, key string) (interface{}, error) {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			return err
+			return nil, err
 		}
 	}
 	if item, err := rc.conn.Get(key); err == nil {
-		return item.Value
+		return item.Value, nil
+	} else {
+		return nil, err
 	}
-	return nil
 }
 
 // GetMulti gets a value from a key in memcache.
-func (rc *Cache) GetMulti(keys []string) []interface{} {
-	size := len(keys)
+func (rc *Cache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
 	var rv []interface{}
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			for i := 0; i < size; i++ {
-				rv = append(rv, err)
-			}
-			return rv
+			return rv, err
 		}
 	}
 	mv, err := rc.conn.GetMulti(keys)
@@ -81,16 +79,12 @@ func (rc *Cache) GetMulti(keys []string) []interface{} {
 		for _, v := range mv {
 			rv = append(rv, v.Value)
 		}
-		return rv
 	}
-	for i := 0; i < size; i++ {
-		rv = append(rv, err)
-	}
-	return rv
+	return rv, err
 }
 
 // Put puts a value into memcache.
-func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
+func (rc *Cache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -108,7 +102,7 @@ func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
 }
 
 // Delete deletes a value in memcache.
-func (rc *Cache) Delete(key string) error {
+func (rc *Cache) Delete(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -118,7 +112,7 @@ func (rc *Cache) Delete(key string) error {
 }
 
 // Incr increases counter.
-func (rc *Cache) Incr(key string) error {
+func (rc *Cache) Incr(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -129,7 +123,7 @@ func (rc *Cache) Incr(key string) error {
 }
 
 // Decr decreases counter.
-func (rc *Cache) Decr(key string) error {
+func (rc *Cache) Decr(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -140,18 +134,18 @@ func (rc *Cache) Decr(key string) error {
 }
 
 // IsExist checks if a value exists in memcache.
-func (rc *Cache) IsExist(key string) bool {
+func (rc *Cache) IsExist(ctx context.Context, key string) (bool, error) {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			return false
+			return false, err
 		}
 	}
 	_, err := rc.conn.Get(key)
-	return err == nil
+	return err == nil, err
 }
 
 // ClearAll clears all cache in memcache.
-func (rc *Cache) ClearAll() error {
+func (rc *Cache) ClearAll(context.Context) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err

pkg/client/cache/memcache/memcache_test.go

@@ -15,15 +15,15 @@
 package memcache
 
 import (
+	"context"
 	"fmt"
 	"os"
-
-	_ "github.com/bradfitz/gomemcache/memcache"
-
 	"strconv"
 	"testing"
 	"time"
 
+	_ "github.com/bradfitz/gomemcache/memcache"
+
 	"github.com/astaxie/beego/pkg/client/cache"
 )
 
@@ -39,67 +39,71 @@ func TestMemcacheCache(t *testing.T) {
 		t.Error("init err")
 	}
 	timeoutDuration := 10 * time.Second
-	if err = bm.Put("astaxie", "1", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", "1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
 	time.Sleep(11 * time.Second)
 
-	if bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("check err")
 	}
-	if err = bm.Put("astaxie", "1", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", "1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
 
-	if v, err := strconv.Atoi(string(bm.Get("astaxie").([]byte))); err != nil || v != 1 {
+	val, _ := bm.Get(context.Background(), "astaxie")
+	if v, err := strconv.Atoi(string(val.([]byte))); err != nil || v != 1 {
 		t.Error("get err")
 	}
 
-	if err = bm.Incr("astaxie"); err != nil {
+	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
 		t.Error("Incr Error", err)
 	}
 
-	if v, err := strconv.Atoi(string(bm.Get("astaxie").([]byte))); err != nil || v != 2 {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v, err := strconv.Atoi(string(val.([]byte))); err != nil || v != 2 {
 		t.Error("get err")
 	}
 
-	if err = bm.Decr("astaxie"); err != nil {
+	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
 		t.Error("Decr Error", err)
 	}
 
-	if v, err := strconv.Atoi(string(bm.Get("astaxie").([]byte))); err != nil || v != 1 {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v, err := strconv.Atoi(string(val.([]byte))); err != nil || v != 1 {
 		t.Error("get err")
 	}
-	bm.Delete("astaxie")
-	if bm.IsExist("astaxie") {
+	bm.Delete(context.Background(), "astaxie")
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
 	}
 
 	// test string
-	if err = bm.Put("astaxie", "author", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", "author", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
-	if v := bm.Get("astaxie").([]byte); string(v) != "author" {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v := val.([]byte); string(v) != "author" {
 		t.Error("get err")
 	}
 
 	// test GetMulti
-	if err = bm.Put("astaxie1", "author1", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie1", "author1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie1") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie1"); !res {
 		t.Error("check err")
 	}
 
-	vv := bm.GetMulti([]string{"astaxie", "astaxie1"})
+	vv, _ := bm.GetMulti(context.Background(), []string{"astaxie", "astaxie1"})
 	if len(vv) != 2 {
 		t.Error("GetMulti ERROR")
 	}
@@ -111,7 +115,7 @@ func TestMemcacheCache(t *testing.T) {
 	}
 
 	// test clear all
-	if err = bm.ClearAll(); err != nil {
+	if err = bm.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")
 	}
 }

pkg/client/cache/memory.go

@@ -15,6 +15,7 @@
 package cache
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"sync"
@@ -58,50 +59,55 @@ func NewMemoryCache() Cache {
 
 // Get returns cache from memory.
 // If non-existent or expired, return nil.
-func (bc *MemoryCache) Get(name string) interface{} {
+func (bc *MemoryCache) Get(ctx context.Context, key string) (interface{}, error) {
 	bc.RLock()
 	defer bc.RUnlock()
-	if itm, ok := bc.items[name]; ok {
+	if itm, ok := bc.items[key]; ok {
 		if itm.isExpire() {
-			return nil
+			return nil, errors.New("the key is expired")
 		}
-		return itm.val
+		return itm.val, nil
 	}
-	return nil
+	return nil, nil
 }
 
 // GetMulti gets caches from memory.
 // If non-existent or expired, return nil.
-func (bc *MemoryCache) GetMulti(names []string) []interface{} {
+func (bc *MemoryCache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
 	var rc []interface{}
-	for _, name := range names {
-		rc = append(rc, bc.Get(name))
+	for _, name := range keys {
+		val, err := bc.Get(context.Background(), name)
+		if err != nil {
+			rc = append(rc, err)
+		} else {
+			rc = append(rc, val)
 		}
-	return rc
+	}
+	return rc, nil
 }
 
 // Put puts cache into memory.
 // If lifespan is 0, it will never overwrite this value unless restarted
-func (bc *MemoryCache) Put(name string, value interface{}, lifespan time.Duration) error {
+func (bc *MemoryCache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	bc.Lock()
 	defer bc.Unlock()
-	bc.items[name] = &MemoryItem{
-		val:         value,
+	bc.items[key] = &MemoryItem{
+		val:         val,
 		createdTime: time.Now(),
-		lifespan:    lifespan,
+		lifespan:    timeout,
 	}
 	return nil
 }
 
 // Delete cache in memory.
-func (bc *MemoryCache) Delete(name string) error {
+func (bc *MemoryCache) Delete(ctx context.Context, key string) error {
 	bc.Lock()
 	defer bc.Unlock()
-	if _, ok := bc.items[name]; !ok {
+	if _, ok := bc.items[key]; !ok {
 		return errors.New("key not exist")
 	}
-	delete(bc.items, name)
-	if _, ok := bc.items[name]; ok {
+	delete(bc.items, key)
+	if _, ok := bc.items[key]; ok {
 		return errors.New("delete key error")
 	}
 	return nil
@@ -109,7 +115,7 @@ func (bc *MemoryCache) Delete(name string) error {
 
 // Incr increases cache counter in memory.
 // Supports int,int32,int64,uint,uint32,uint64.
-func (bc *MemoryCache) Incr(key string) error {
+func (bc *MemoryCache) Incr(ctx context.Context, key string) error {
 	bc.Lock()
 	defer bc.Unlock()
 	itm, ok := bc.items[key]
@@ -136,7 +142,7 @@ func (bc *MemoryCache) Incr(key string) error {
 }
 
 // Decr decreases counter in memory.
-func (bc *MemoryCache) Decr(key string) error {
+func (bc *MemoryCache) Decr(ctx context.Context, key string) error {
 	bc.Lock()
 	defer bc.Unlock()
 	itm, ok := bc.items[key]
@@ -175,17 +181,17 @@ func (bc *MemoryCache) Decr(key string) error {
 }
 
 // IsExist checks if cache exists in memory.
-func (bc *MemoryCache) IsExist(name string) bool {
+func (bc *MemoryCache) IsExist(ctx context.Context, key string) (bool, error) {
 	bc.RLock()
 	defer bc.RUnlock()
-	if v, ok := bc.items[name]; ok {
-		return !v.isExpire()
+	if v, ok := bc.items[key]; ok {
+		return !v.isExpire(), nil
 	}
-	return false
+	return false, nil
 }
 
 // ClearAll deletes all cache in memory.
-func (bc *MemoryCache) ClearAll() error {
+func (bc *MemoryCache) ClearAll(context.Context) error {
 	bc.Lock()
 	defer bc.Unlock()
 	bc.items = make(map[string]*MemoryItem)

pkg/client/cache/redis/redis.go

@@ -30,6 +30,7 @@
 package redis
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -83,63 +84,60 @@ func (rc *Cache) associate(originKey interface{}) string {
 }
 
 // Get cache from redis.
-func (rc *Cache) Get(key string) interface{} {
+func (rc *Cache) Get(ctx context.Context, key string) (interface{}, error) {
 	if v, err := rc.do("GET", key); err == nil {
-		return v
+		return v, nil
+	} else {
+		return nil, err
 	}
-	return nil
 }
 
 // GetMulti gets cache from redis.
-func (rc *Cache) GetMulti(keys []string) []interface{} {
+func (rc *Cache) GetMulti(ctx context.Context, keys []string) ([]interface{}, error) {
 	c := rc.p.Get()
 	defer c.Close()
 	var args []interface{}
 	for _, key := range keys {
 		args = append(args, rc.associate(key))
 	}
-	values, err := redis.Values(c.Do("MGET", args...))
-	if err != nil {
-		return nil
-	}
-	return values
+	return redis.Values(c.Do("MGET", args...))
 }
 
 // Put puts cache into redis.
-func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
+func (rc *Cache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	_, err := rc.do("SETEX", key, int64(timeout/time.Second), val)
 	return err
 }
 
 // Delete deletes a key's cache in redis.
-func (rc *Cache) Delete(key string) error {
+func (rc *Cache) Delete(ctx context.Context, key string) error {
 	_, err := rc.do("DEL", key)
 	return err
 }
 
 // IsExist checks cache's existence in redis.
-func (rc *Cache) IsExist(key string) bool {
+func (rc *Cache) IsExist(ctx context.Context, key string) (bool, error) {
 	v, err := redis.Bool(rc.do("EXISTS", key))
 	if err != nil {
-		return false
+		return false, err
 	}
-	return v
+	return v, nil
 }
 
 // Incr increases a key's counter in redis.
-func (rc *Cache) Incr(key string) error {
+func (rc *Cache) Incr(ctx context.Context, key string) error {
 	_, err := redis.Bool(rc.do("INCRBY", key, 1))
 	return err
 }
 
 // Decr decreases a key's counter in redis.
-func (rc *Cache) Decr(key string) error {
+func (rc *Cache) Decr(ctx context.Context, key string) error {
 	_, err := redis.Bool(rc.do("INCRBY", key, -1))
 	return err
 }
 
 // ClearAll deletes all cache in the redis collection
-func (rc *Cache) ClearAll() error {
+func (rc *Cache) ClearAll(context.Context) error {
 	cachedKeys, err := rc.Scan(rc.key + ":*")
 	if err != nil {
 		return err

pkg/client/cache/redis/redis_test.go

@@ -15,6 +15,7 @@
 package redis
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"testing"
@@ -38,67 +39,70 @@ func TestRedisCache(t *testing.T) {
 		t.Error("init err")
 	}
 	timeoutDuration := 10 * time.Second
-	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
 	time.Sleep(11 * time.Second)
 
-	if bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("check err")
 	}
-	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
 
-	if v, _ := redis.Int(bm.Get("astaxie"), err); v != 1 {
+	val, _ := bm.Get(context.Background(), "astaxie")
+	if v, _ := redis.Int(val, err); v != 1 {
 		t.Error("get err")
 	}
 
-	if err = bm.Incr("astaxie"); err != nil {
+	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
 		t.Error("Incr Error", err)
 	}
-
-	if v, _ := redis.Int(bm.Get("astaxie"), err); v != 2 {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v, _ := redis.Int(val, err); v != 2 {
 		t.Error("get err")
 	}
 
-	if err = bm.Decr("astaxie"); err != nil {
+	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
 		t.Error("Decr Error", err)
 	}
 
-	if v, _ := redis.Int(bm.Get("astaxie"), err); v != 1 {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v, _ := redis.Int(val, err); v != 1 {
 		t.Error("get err")
 	}
-	bm.Delete("astaxie")
-	if bm.IsExist("astaxie") {
+	bm.Delete(context.Background(), "astaxie")
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
 	}
 
 	// test string
-	if err = bm.Put("astaxie", "author", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie", "author", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie"); !res {
 		t.Error("check err")
 	}
 
-	if v, _ := redis.String(bm.Get("astaxie"), err); v != "author" {
+	val, _ = bm.Get(context.Background(), "astaxie")
+	if v, _ := redis.String(val, err); v != "author" {
 		t.Error("get err")
 	}
 
 	// test GetMulti
-	if err = bm.Put("astaxie1", "author1", timeoutDuration); err != nil {
+	if err = bm.Put(context.Background(), "astaxie1", "author1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !bm.IsExist("astaxie1") {
+	if res, _ := bm.IsExist(context.Background(), "astaxie1"); !res {
 		t.Error("check err")
 	}
 
-	vv := bm.GetMulti([]string{"astaxie", "astaxie1"})
+	vv, _ := bm.GetMulti(context.Background(), []string{"astaxie", "astaxie1"})
 	if len(vv) != 2 {
 		t.Error("GetMulti ERROR")
 	}
@@ -110,7 +114,7 @@ func TestRedisCache(t *testing.T) {
 	}
 
 	// test clear all
-	if err = bm.ClearAll(); err != nil {
+	if err = bm.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")
 	}
 }
@@ -130,7 +134,7 @@ func TestCache_Scan(t *testing.T) {
 	}
 	// insert all
 	for i := 0; i < 100; i++ {
-		if err = bm.Put(fmt.Sprintf("astaxie%d", i), fmt.Sprintf("author%d", i), timeoutDuration); err != nil {
+		if err = bm.Put(context.Background(), fmt.Sprintf("astaxie%d", i), fmt.Sprintf("author%d", i), timeoutDuration); err != nil {
 			t.Error("set Error", err)
 		}
 	}
@@ -144,7 +148,7 @@ func TestCache_Scan(t *testing.T) {
 	assert.Equal(t, 100, len(keys), "scan all error")
 
 	// clear all
-	if err = bm.ClearAll(); err != nil {
+	if err = bm.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")
 	}
 

pkg/client/cache/ssdb/ssdb.go

@@ -1,6 +1,7 @@
 package ssdb
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"strconv"
@@ -24,29 +25,26 @@ func NewSsdbCache() cache.Cache {
 }
 
 // Get gets a key's value from memcache.
-func (rc *Cache) Get(key string) interface{} {
+func (rc *Cache) Get(ctx context.Context, key string) (interface{}, error) {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			return nil
+			return nil, nil
 		}
 	}
 	value, err := rc.conn.Get(key)
 	if err == nil {
-		return value
+		return value, nil
 	}
-	return nil
+	return nil, nil
 }
 
-// GetMulti gets one or keys values from memcache.
-func (rc *Cache) GetMulti(keys []string) []interface{} {
+// 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{}
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			for i := 0; i < size; i++ {
-				values = append(values, err)
-			}
-			return values
+			return values, err
 		}
 	}
 	res, err := rc.conn.Do("multi_get", keys)
@@ -55,12 +53,12 @@ func (rc *Cache) GetMulti(keys []string) []interface{} {
 		for i := 1; i < resSize; i += 2 {
 			values = append(values, res[i+1])
 		}
-		return values
+		return values, nil
 	}
 	for i := 0; i < size; i++ {
 		values = append(values, err)
 	}
-	return values
+	return values, nil
 }
 
 // DelMulti deletes one or more keys from memcache
@@ -76,13 +74,13 @@ func (rc *Cache) DelMulti(keys []string) error {
 
 // Put puts value into memcache.
 // value:  must be of type string
-func (rc *Cache) Put(key string, value interface{}, timeout time.Duration) error {
+func (rc *Cache) Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
 		}
 	}
-	v, ok := value.(string)
+	v, ok := val.(string)
 	if !ok {
 		return errors.New("value must string")
 	}
@@ -104,7 +102,7 @@ func (rc *Cache) Put(key string, value interface{}, timeout time.Duration) error
 }
 
 // Delete deletes a value in memcache.
-func (rc *Cache) Delete(key string) error {
+func (rc *Cache) Delete(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -115,7 +113,7 @@ func (rc *Cache) Delete(key string) error {
 }
 
 // Incr increases a key's counter.
-func (rc *Cache) Incr(key string) error {
+func (rc *Cache) Incr(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -126,7 +124,7 @@ func (rc *Cache) Incr(key string) error {
 }
 
 // Decr decrements a key's counter.
-func (rc *Cache) Decr(key string) error {
+func (rc *Cache) Decr(ctx context.Context, key string) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err
@@ -137,25 +135,25 @@ func (rc *Cache) Decr(key string) error {
 }
 
 // IsExist checks if a key exists in memcache.
-func (rc *Cache) IsExist(key string) bool {
+func (rc *Cache) IsExist(ctx context.Context, key string) (bool, error) {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
-			return false
+			return false, err
 		}
 	}
 	resp, err := rc.conn.Do("exists", key)
 	if err != nil {
-		return false
+		return false, err
 	}
 	if len(resp) == 2 && resp[1] == "1" {
-		return true
+		return true, nil
 	}
-	return false
+	return false, nil
 
 }
 
 // ClearAll clears all cached items in memcache.
-func (rc *Cache) ClearAll() error {
+func (rc *Cache) ClearAll(context.Context) error {
 	if rc.conn == nil {
 		if err := rc.connectInit(); err != nil {
 			return err

pkg/client/cache/ssdb/ssdb_test.go

@@ -1,6 +1,7 @@
 package ssdb
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"strconv"
@@ -23,75 +24,78 @@ func TestSsdbcacheCache(t *testing.T) {
 	}
 
 	// test put and exist
-	if ssdb.IsExist("ssdb") {
+	if res, _ := ssdb.IsExist(context.Background(), "ssdb"); res {
 		t.Error("check err")
 	}
 	timeoutDuration := 10 * time.Second
-	//timeoutDuration := -10*time.Second   if timeoutDuration is negtive,it means permanent
-	if err = ssdb.Put("ssdb", "ssdb", timeoutDuration); err != nil {
+	// timeoutDuration := -10*time.Second   if timeoutDuration is negtive,it means permanent
+	if err = ssdb.Put(context.Background(), "ssdb", "ssdb", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if !ssdb.IsExist("ssdb") {
+	if res, _ := ssdb.IsExist(context.Background(), "ssdb"); !res {
 		t.Error("check err")
 	}
 
 	// Get test done
-	if err = ssdb.Put("ssdb", "ssdb", timeoutDuration); err != nil {
+	if err = ssdb.Put(context.Background(), "ssdb", "ssdb", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
 
-	if v := ssdb.Get("ssdb"); v != "ssdb" {
+	if v, _ := ssdb.Get(context.Background(), "ssdb"); v != "ssdb" {
 		t.Error("get Error")
 	}
 
-	//inc/dec test done
-	if err = ssdb.Put("ssdb", "2", timeoutDuration); err != nil {
+	// inc/dec test done
+	if err = ssdb.Put(context.Background(), "ssdb", "2", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if err = ssdb.Incr("ssdb"); err != nil {
+	if err = ssdb.Incr(context.Background(), "ssdb"); err != nil {
 		t.Error("incr Error", err)
 	}
 
-	if v, err := strconv.Atoi(ssdb.Get("ssdb").(string)); err != nil || v != 3 {
+	val, _ := ssdb.Get(context.Background(), "ssdb")
+	if v, err := strconv.Atoi(val.(string)); err != nil || v != 3 {
 		t.Error("get err")
 	}
 
-	if err = ssdb.Decr("ssdb"); err != nil {
+	if err = ssdb.Decr(context.Background(), "ssdb"); err != nil {
 		t.Error("decr error")
 	}
 
 	// test del
-	if err = ssdb.Put("ssdb", "3", timeoutDuration); err != nil {
+	if err = ssdb.Put(context.Background(), "ssdb", "3", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
-	if v, err := strconv.Atoi(ssdb.Get("ssdb").(string)); err != nil || v != 3 {
+
+	val, _ = ssdb.Get(context.Background(), "ssdb")
+	if v, err := strconv.Atoi(val.(string)); err != nil || v != 3 {
 		t.Error("get err")
 	}
-	if err := ssdb.Delete("ssdb"); err == nil {
-		if ssdb.IsExist("ssdb") {
+	if err := ssdb.Delete(context.Background(), "ssdb"); err == nil {
+		if e, _ := ssdb.IsExist(context.Background(), "ssdb"); e {
 			t.Error("delete err")
 		}
 	}
 
-	//test string
-	if err = ssdb.Put("ssdb", "ssdb", -10*time.Second); err != nil {
+	// test string
+	if err = ssdb.Put(context.Background(), "ssdb", "ssdb", -10*time.Second); err != nil {
 		t.Error("set Error", err)
 	}
-	if !ssdb.IsExist("ssdb") {
+	if res, _ := ssdb.IsExist(context.Background(), "ssdb"); !res {
 		t.Error("check err")
 	}
-	if v := ssdb.Get("ssdb").(string); v != "ssdb" {
+	if v, _ := ssdb.Get(context.Background(), "ssdb"); v.(string) != "ssdb" {
 		t.Error("get err")
 	}
 
-	//test GetMulti done
-	if err = ssdb.Put("ssdb1", "ssdb1", -10*time.Second); err != nil {
+	// test GetMulti done
+	if err = ssdb.Put(context.Background(), "ssdb1", "ssdb1", -10*time.Second); err != nil {
 		t.Error("set Error", err)
 	}
-	if !ssdb.IsExist("ssdb1") {
+	if res, _ := ssdb.IsExist(context.Background(), "ssdb1"); !res {
 		t.Error("check err")
 	}
-	vv := ssdb.GetMulti([]string{"ssdb", "ssdb1"})
+	vv, _ := ssdb.GetMulti(context.Background(), []string{"ssdb", "ssdb1"})
 	if len(vv) != 2 {
 		t.Error("getmulti error")
 	}
@@ -103,10 +107,12 @@ func TestSsdbcacheCache(t *testing.T) {
 	}
 
 	// test clear all done
-	if err = ssdb.ClearAll(); err != nil {
+	if err = ssdb.ClearAll(context.Background()); err != nil {
 		t.Error("clear all err")
 	}
-	if ssdb.IsExist("ssdb") || ssdb.IsExist("ssdb1") {
+	e1, _ := ssdb.IsExist(context.Background(), "ssdb")
+	e2, _ := ssdb.IsExist(context.Background(), "ssdb1")
+	if e1 || e2 {
 		t.Error("check err")
 	}
 }

pkg/server/web/captcha/captcha.go

@@ -59,6 +59,7 @@
 package captcha
 
 import (
+	context2 "context"
 	"fmt"
 	"html/template"
 	"net/http"
@@ -137,14 +138,15 @@ func (c *Captcha) Handler(ctx *context.Context) {
 
 	if len(ctx.Input.Query("reload")) > 0 {
 		chars = c.genRandChars()
-		if err := c.store.Put(key, chars, c.Expiration); err != nil {
+		if err := c.store.Put(context2.Background(), key, chars, c.Expiration); err != nil {
 			ctx.Output.SetStatus(500)
 			ctx.WriteString("captcha reload error")
 			logs.Error("Reload Create Captcha Error:", err)
 			return
 		}
 	} else {
-		if v, ok := c.store.Get(key).([]byte); ok {
+		val, _ := c.store.Get(context2.Background(), key)
+		if v, ok := val.([]byte); ok {
 			chars = v
 		} else {
 			ctx.Output.SetStatus(404)
@@ -183,7 +185,7 @@ func (c *Captcha) CreateCaptcha() (string, error) {
 	chars := c.genRandChars()
 
 	// save to store
-	if err := c.store.Put(c.key(id), chars, c.Expiration); err != nil {
+	if err := c.store.Put(context2.Background(), c.key(id), chars, c.Expiration); err != nil {
 		return "", err
 	}
 
@@ -205,8 +207,8 @@ func (c *Captcha) Verify(id string, challenge string) (success bool) {
 	var chars []byte
 
 	key := c.key(id)
-
-	if v, ok := c.store.Get(key).([]byte); ok {
+	val, _ := c.store.Get(context2.Background(), key)
+	if v, ok := val.([]byte); ok {
 		chars = v
 	} else {
 		return
@@ -214,7 +216,7 @@ func (c *Captcha) Verify(id string, challenge string) (success bool) {
 
 	defer func() {
 		// finally remove it
-		c.store.Delete(key)
+		c.store.Delete(context2.Background(), key)
 	}()
 
 	if len(chars) != len(challenge) {
@@ -271,9 +273,9 @@ func NewWithFilter(urlPrefix string, store Storage) *Captcha {
 
 type Storage interface {
 	// Get a cached value by key.
-	Get(key string) interface{}
+	Get(ctx context2.Context, key string) (interface{}, error)
 	// Set a cached value with key and expire time.
-	Put(key string, val interface{}, timeout time.Duration) error
+	Put(ctx context2.Context, key string, val interface{}, timeout time.Duration) error
 	// Delete cached value by key.
-	Delete(key string) error
+	Delete(ctx context2.Context, key string) error
 }