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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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16
credential/default_js_ticket.go
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@@ -42,16 +42,20 @@ type ResTicket struct {
//GetTicket 获取jsapi_ticket
func (js *DefaultJsTicket) GetTicket(accessToken string) (ticketStr string, err error) {
//先从cache中取
jsAPITicketCacheKey := fmt.Sprintf("%s_jsapi_ticket_%s", js.cacheKeyPrefix, js.appID)
if val := js.cache.Get(jsAPITicketCacheKey); val != nil {
return val.(string), nil
}
js.jsAPITicketLock.Lock()
defer js.jsAPITicketLock.Unlock()
//先从cache中取
jsAPITicketCacheKey := fmt.Sprintf("%s_jsapi_ticket_%s", js.cacheKeyPrefix, js.appID)
val := js.cache.Get(jsAPITicketCacheKey)
if val != nil {
ticketStr = val.(string)
return
// 双检，防止重复从微信服务器获取
if val := js.cache.Get(jsAPITicketCacheKey); val != nil {
return val.(string), nil
}
var ticket ResTicket
ticket, err = GetTicketFromServer(accessToken)
if err != nil {