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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package common | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/formancehq/go-libs/v2/api" | ||
| "net/http" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| type responseWriter struct { | ||
| http.ResponseWriter | ||
| sync.Mutex | ||
| contextWithTimeout context.Context | ||
| headerWritten bool | ||
| } | ||
|
|
||
| func (r *responseWriter) Write(bytes []byte) (int, error) { | ||
| r.Lock() | ||
| defer r.Unlock() | ||
|
|
||
| // As the http status code has already been sent, we ignore the context canceled in this case. | ||
| // The timeout is usually shorter than the allowed window. | ||
| // We let a chance to the client to get their data. | ||
| if r.headerWritten { | ||
| return r.ResponseWriter.Write(bytes) | ||
| } | ||
|
|
||
| select { | ||
| case <-r.contextWithTimeout.Done(): | ||
| return 0, nil | ||
| default: | ||
| return r.ResponseWriter.Write(bytes) | ||
| } | ||
| } | ||
|
|
||
| func (r *responseWriter) WriteHeader(statusCode int) { | ||
| r.Lock() | ||
| defer r.Unlock() | ||
|
|
||
| select { | ||
| case <-r.contextWithTimeout.Done(): | ||
| default: | ||
| r.ResponseWriter.WriteHeader(statusCode) | ||
| r.headerWritten = true | ||
| } | ||
| } | ||
|
|
||
| var _ http.ResponseWriter = &responseWriter{} | ||
|
|
||
| type TimeoutConfiguration struct { | ||
| Timeout time.Duration | ||
| StatusCode int | ||
| } | ||
|
|
||
| func Timeout(configuration TimeoutConfiguration) func(h http.Handler) http.Handler { | ||
| return func(h http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| newRequestContext, cancelRequestContext := context.WithCancel(r.Context()) | ||
| defer cancelRequestContext() | ||
|
|
||
| contextWithTimeout, cancelContextWithTimeout := context.WithTimeout(context.Background(), configuration.Timeout) | ||
| defer cancelContextWithTimeout() | ||
|
|
||
| rw := &responseWriter{ | ||
| ResponseWriter: w, | ||
| contextWithTimeout: contextWithTimeout, | ||
| } | ||
| done := make(chan struct{}) | ||
| go func() { | ||
| select { | ||
| case <-done: | ||
| case <-contextWithTimeout.Done(): | ||
| rw.Lock() | ||
| defer rw.Unlock() | ||
|
|
||
| if !rw.headerWritten { | ||
| cancelRequestContext() | ||
| api.WriteErrorResponse(w, configuration.StatusCode, "TIMEOUT", fmt.Errorf("request timed out")) | ||
| } | ||
| } | ||
| }() | ||
| defer close(done) | ||
|
|
||
| h.ServeHTTP(w, r.WithContext(newRequestContext)) | ||
| }) | ||
| } | ||
| } |
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