v1.4.1 add pool get timeout

cache.go

@@ -1,10 +1,12 @@
 package cache
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"reflect"
+	"sync"
 	"time"
 
 	"github.com/gomodule/redigo/redis"
@@ -14,6 +16,7 @@ import (
 var (
 	ErrExpired        = errors.New("expired")
 	ErrNotFound       = errors.New("not found")
+	ErrTimeout        = errors.New("not found(timeout)")
 	OptWithoutGetter  = optWithoutGetter{}  // for get only
 	OptWithCreateTime = optWithCreateTime{} // for set & get
 	OptWithRedisConn  = optWithRedisConn{}  // for set & get
@@ -63,14 +66,13 @@ type Config struct {
 func NewCache[T any](getter Getter[T], cfg Config) Cacher[T] {
 	var c = new(cacher[T])
 	// Getter
-	c.cfg = cfg
 	c.getter = getter
 
 	// Local cache
 	if cfg.UseLocalCache {
 		c.localCache = new(localCacher[T])
 		c.localCache.cacher = c
-		c.localCache.cacheItems = map[string]*cacheItem[T]{}
+		c.localCache.cacheItems = sync.Map{} //map[string]*cacheItem[T]{}
 		c.localCache.cacheDuration = time.Duration(cfg.LocalCacheLifetimeSecond) * time.Second
 		if c.localCache.cacheDuration.Nanoseconds() == 0 {
 			c.localCache.cacheDuration = 60 * time.Second
@@ -100,6 +102,7 @@ func NewCache[T any](getter Getter[T], cfg Config) Cacher[T] {
 		cfg.UseExpiredCache = &[]bool{true}[0]
 	}
 
+	c.cfg = cfg
 	name := reflect.TypeOf(*new(T)).String()
 	log.PrintPretty("new cache '"+name+"' by config:", cfg)
 	return c
@@ -159,9 +162,9 @@ type cacheItem[T any] struct {
 }
 
 type localCacher[T any] struct {
-	cacher        *cacher[T]
+	cacher        *cacher[T]    // parents cacher pointer
-	cacheItems    map[string]*cacheItem[T]
+	cacheItems    sync.Map      // map[string]*cacheItem[T]
-	cacheDuration time.Duration
+	cacheDuration time.Duration // cache alive duration
 }
 
 type redisCacher[T any] struct {
@@ -174,9 +177,11 @@ type redisCacher[T any] struct {
 
 func (c *localCacher[T]) GetFromCache(id string, options ...Option) (t *T, err error) {
 	// Step 1. get from map
-	var a, ok = c.cacheItems[id]
+	var a *cacheItem[T] = nil
-	if !ok {
+	if aa, ok := c.cacheItems.Load(id); !ok {
 		return nil, ErrNotFound
+	} else if a, ok = aa.(*cacheItem[T]); !ok {
+		panic("unreachable code, inner item type must be '*cacheItem[T]'")
 	}
 
 	// Step 2. check is expired or not
@@ -189,8 +194,7 @@ func (c *localCacher[T]) GetFromCache(id string, options ...Option) (t *T, err e
 				err = ErrExpired
 			} else {
 				log.Infof("cache(%s) is in local cache but expired, we delete it", id)
-				//TODO: cocurrent
+				c.cacheItems.Delete(id)
-				delete(c.cacheItems, id)
 				return nil, ErrNotFound
 			}
 		}
@@ -206,7 +210,7 @@ func (c *localCacher[T]) GetFromCache(id string, options ...Option) (t *T, err e
 	if err == ErrExpired {
 		return a.Data, ErrExpired
 	} else if err != nil {
-		panic("unreachable code")
+		panic("unreachable code: only ErrExpired error valid when data exist")
 	}
 	return a.Data, nil
 }
@@ -219,7 +223,7 @@ func (c *localCacher[T]) SetIntoCache(id string, t *T, options ...Option) (err e
 	} else {
 		newitem.CreateTime = time.Now()
 	}
-	c.cacheItems[id] = newitem
+	c.cacheItems.Store(id, newitem)
 	return nil
 }
 
@@ -234,7 +238,14 @@ func (c *redisCacher[T]) GetFromCache(id string, options ...Option) (*T, error)
 	if opt.withRedisConn != nil && opt.withRedisConn.redisconn != nil {
 		rds = opt.withRedisConn.redisconn
 	} else if c.rdsPool != nil {
-		rds = c.rdsPool.Get()
+		// timeout context
+		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+		defer cancel()
+		// redis conn from pool
+		rds, err = c.rdsPool.GetContext(ctx)
+		if err != nil {
+			return nil, ErrTimeout
+		}
 		defer rds.Close()
 	} else if c.rds != nil {
 		rds = c.rds
@@ -294,7 +305,14 @@ func (c *redisCacher[T]) SetIntoCache(id string, t *T, options ...Option) error
 	if opt.withRedisConn != nil && opt.withRedisConn.redisconn != nil {
 		rds = opt.withRedisConn.redisconn
 	} else if c.rdsPool != nil {
-		rds = c.rdsPool.Get()
+		// timeout context
+		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+		defer cancel()
+		// redis conn from pool
+		rds, err = c.rdsPool.GetContext(ctx)
+		if err != nil {
+			return errors.New("set cache failed: 'get redis conn timeout'")
+		}
 		defer rds.Close()
 	} else if c.rds != nil {
 		rds = c.rds
@@ -362,7 +380,7 @@ func (c *cacher[T]) GetFromCache(id string, options ...Option) (dat *T, err erro
 			log.Infof("get cache(id:%s) from redisCacher success(but expired), need try next", id)
 			lastExpiredDat = dat
 		} else {
-			log.Infof("get cache(id:%s) from redisCacher failed, need try next", id)
+			log.Infof("get cache(id:%s) from redisCacher failed, need try from next cacher", id)
 		}
 	}