c296f4fed6
* When route cannot be found on chi, go to macaron * Stick chi version to 1.5.0 * Follow router log setting
50 lines
1.2 KiB
Go
Vendored
50 lines
1.2 KiB
Go
Vendored
package middleware
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
"time"
|
|
)
|
|
|
|
// Timeout is a middleware that cancels ctx after a given timeout and return
|
|
// a 504 Gateway Timeout error to the client.
|
|
//
|
|
// It's required that you select the ctx.Done() channel to check for the signal
|
|
// if the context has reached its deadline and return, otherwise the timeout
|
|
// signal will be just ignored.
|
|
//
|
|
// ie. a route/handler may look like:
|
|
//
|
|
// r.Get("/long", func(w http.ResponseWriter, r *http.Request) {
|
|
// ctx := r.Context()
|
|
// processTime := time.Duration(rand.Intn(4)+1) * time.Second
|
|
//
|
|
// select {
|
|
// case <-ctx.Done():
|
|
// return
|
|
//
|
|
// case <-time.After(processTime):
|
|
// // The above channel simulates some hard work.
|
|
// }
|
|
//
|
|
// w.Write([]byte("done"))
|
|
// })
|
|
//
|
|
func Timeout(timeout time.Duration) func(next http.Handler) http.Handler {
|
|
return func(next http.Handler) http.Handler {
|
|
fn := func(w http.ResponseWriter, r *http.Request) {
|
|
ctx, cancel := context.WithTimeout(r.Context(), timeout)
|
|
defer func() {
|
|
cancel()
|
|
if ctx.Err() == context.DeadlineExceeded {
|
|
w.WriteHeader(http.StatusGatewayTimeout)
|
|
}
|
|
}()
|
|
|
|
r = r.WithContext(ctx)
|
|
next.ServeHTTP(w, r)
|
|
}
|
|
return http.HandlerFunc(fn)
|
|
}
|
|
}
|