func setAppEngineContext(next alice.ContextHandler) alice.ContextHandler {
fn := func(empty appContext.Context, w http.ResponseWriter, r *http.Request) {
// we hang on our empty parent context the appengine context for further middlewares
newContext := appengine.WithContext(empty, r)
next.ServeHTTPContext(newContext, w, r)
}
return alice.ContextHandlerFunc(fn)
}
func NewRecoverHandler(next alice.ContextHandler) alice.ContextHandler {
fn := func(c context.Context, w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Printf("panic: %+v", err)
http.Error(w, http.StatusText(500), 500)
}
}()
next.ServeHTTPContext(c, w, r)
}
return alice.ContextHandlerFunc(fn)
}
func middleware(h alice.ContextHandler) alice.ContextHandler {
return alice.ContextHandlerFunc(func(ctx appContext.Context, rw http.ResponseWriter, req *http.Request) {
ctx = newContextWithRequestID(ctx, req)
h.ServeHTTPContext(ctx, rw, req)
})
}