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使用双检锁优化 Token 获取 (#444)

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浩
2021-08-26 10:34:24 +08:00
committed by GitHub
parent c61154105b
commit 80d91d8316
2 changed files with 19 additions and 11 deletions
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14
credential/default_access_token.go
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@@ -56,15 +56,19 @@ type ResAccessToken struct {
//GetAccessToken 获取access_token,先从cache中获取，没有则从服务端获取
func (ak *DefaultAccessToken) GetAccessToken() (accessToken string, err error) {
// 先从cache中取
accessTokenCacheKey := fmt.Sprintf("%s_access_token_%s", ak.cacheKeyPrefix, ak.appID)
if val := ak.cache.Get(accessTokenCacheKey); val != nil {
return val.(string), nil
}
//加上lock，是为了防止在并发获取token时，cache刚好失效，导致从微信服务器上获取到不同token
ak.accessTokenLock.Lock()
defer ak.accessTokenLock.Unlock()
accessTokenCacheKey := fmt.Sprintf("%s_access_token_%s", ak.cacheKeyPrefix, ak.appID)
val := ak.cache.Get(accessTokenCacheKey)
if val != nil {
accessToken = val.(string)
return
// 双检，防止重复从微信服务器获取
if val := ak.cache.Get(accessTokenCacheKey); val != nil {
return val.(string), nil
}
//cache失效，从微信服务器获取