Golang：网络状况是否会使net / http HandleFunc感到恐慌？

Question

Think about that I have a critical function, that should run all or nothing.

TakeMoneyFromSomeone()
GiveMoneyToSomeoneElse()

My question is: Can I trust Go that the function will not panicing between line1 & line2 when using `net/http.HandleFunc? (The two function are inside my http handler)

I'm focusing only on networking issues. For example: if the client disconnect, or timeout or too long body, or anything else. There is any networking issue that can make the server panic between line1, and line2? (Those two lines not using network)

If the answer is no. What happened if I try to ResponseWriter.write to a client that closed the connection. Is it will panic?

Answer 1

The HandlerFunc itself doesn't related to any potential networking issues, it just registers handlers to url patterns. HandlerFunc

With 0 timeouts it will hang not panic. The better way is to use timeouts and handle errors instead of using default timeouts.

More control over the server's behavior is available by creating a custom Server:

s := &http.Server{
    Addr:           ":8080",
    Handler:        myHandler,
    ReadTimeout:    10 * time.Second,
    WriteTimeout:   10 * time.Second,
    MaxHeaderBytes: 1 << 20,
}
log.Fatal(s.ListenAndServe())

And you shouldn't apprehend a panic from a built-in libs.

Go By Example:

A panic typically means something went unexpectedly wrong. Mostly we use it to fail fast on errors that shouldn’t occur during normal operation, or that we aren’t prepared to handle gracefully.

Note that unlike some languages which use exceptions for handling of many errors, in Go it is idiomatic to use error-indicating return values wherever possible.