Hi!
There is a fundamental thing you got to grok in Go, which is that the
program is concurrent. If you have many requests to your server at the same
time, they'll all try to write to your global `data`. This is called a data
race, and it leads to all kinds of undefined behavior. You are not even
guaranteed to see a value someone sent, but something entirely different
(random garbling of data). Go comes equipped with a race detector you can
use to find data races in your program.
You will have to handle the race in some way. One tactic is to create a
channel for your data. Then you send a message on that channel with your
data, and you can read from the channel in the other part of your
application.
* It avoids the data race
* If requests come in at the same time, they are queued on the channel, so
you can handle them all
* If you buffer the channel, you can absorb short-term spikes in requests
On Mon, Jun 10, 2019 at 12:51 PM <afriyie.abra...@gmail.com> wrote:
> I have this simple http server. How can i access the request data to a
> global variable and use it in any other part of my application (example in
> different function).
>
>
> package main
> import (
> "io"
> "net/http")
> var data string // Get http request URL data globally and use it in other
> part of the application
>
> func hello(w http.ResponseWriter, r *http.Request) {
> data := r.URL.Query().Get("somestring")}
>
> func main() {
> mux := http.NewServeMux()
> mux.HandleFunc("/", hello)
>
> http.ListenAndServe(":8000", mux)}
>
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--
J.
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