我重用 http 客户端连接来对单个端点进行外部调用。该程序的摘录如下所示：
var AppCon MyApp
func New(user, pass string, platformURL *url.URL, restContext string) (*MyApp, error) {
if AppCon == (MyApp{}) {
AppCon = MyApp{
user: user,
password: pass,
URL: platformURL,
Client: &http.Client{Timeout: 30 * time.Second},
RESTContext: restContext,
}
cj, err := cookiejar.New(nil)
if err != nil {
return &AppCon, err
}
AppCon.cookie = cj
}
return &AppCon, nil
}
// This is an example only. There are many more functions which accept *MyApp as a pointer.
func(ma *MyApp) GetUser(name string) (string, error){
// Return user
}
func main(){
for {
// Get messages from a queue
// The message returned from the queue provide info on which methods to call
// 'm' is a struct with message metadata
c, err := New(m.un, m.pass, m.url)
go func(){
// Do something i.e c.GetUser("123456")
}()
}
}
我现在需要建立与通过队列消息接收的不同端点/凭据的客户端连接。
我预见的问题是我不能简单地修改AppCon新的端点详细信息，因为返回了一个指向的指针MyApp，从而导致重置c. 这可能会影响对非预期端点进行 HTTP 调用的 goroutine。为了使事情变得不简单，该程序并不意味着知道端点（我正在考虑使用switch语句），而是通过队列消息接收它需要的东西。
鉴于我提出的问题是正确的，有没有关于如何解决它的建议？
编辑 1
根据提供的反馈，我倾向于相信这将解决我的问题：
- 删除使用 Singleton 的
MyApp - 解耦 http 客户端，
MyApp使其可以重用
var httpClient *http.Client
func New(user, pass string, platformURL *url.URL, restContext string) (*MyApp, error) {
AppCon = MyApp{
user: user,
password: pass,
URL: platformURL,
Client: func() *http.Client {
if httpClient == nil {
httpClient = &http.Client{Timeout: 30 * time.Second}
}
return httpClient
}()
RESTContext: restContext,
}
return &AppCon, nil
}
// This is an example only. There are many more functions which accept *MyApp as a pointer.
func(ma *MyApp) GetUser(name string) (string, error){
// Return user
}
func main(){
for {
// Get messages from a queue
// The message returned from the queue provide info on which methods to call
// 'm' is a struct with message metadata
c, err := New(m.un, m.pass, m.url)
// Must pass a reference
go func(c *MyApp){
// Do something i.e c.GetUser("123456")
}(c)
}
}