func (srv Server) Handler(w http.ResponseWriter, r *http.Request) {
l := log.New()
l.SetPrefix(fmt.Sprintf("[HTTP:%p]", r))
l.Info("%+v", r)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
l.Error(err)
http.Error(w, err.Error(), 500)
return
}
params, err := NewUserRequest(body)
if err != nil {
l.Error(err)
http.Error(w, err.Error(), 400)
return
}
l.Infof("Invoking: %s %+v", params.SubCommandName, params.Arguments)
output, cmdErr, err := params.Run(srv.Commands)
if err != nil {
l.Error(err)
http.Error(w, err.Error(), 400)
} else {
if cmdErr != nil {
// XXX: perhaps we should wrap the error as a JSON object
// just as we do for 200-code responses.
l.Error(err)
http.Error(w, err.Error(), 500)
} else {
// Command ran successfully. Send the output back.
if _, err = w.Write([]byte(output)); err != nil {
l.Error(err)
}
}
}
}
// FIXME: best way to report errors in ServerHTTP?
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Create a logger with a prefix unique to this request. Assuming
// that a new request object is created per request, its memory
// address (%p) should give us an unique identifier.
l := log.New()
l.SetPrefix(fmt.Sprintf("[HTTP:%p] ", r))
l.Infof("%+v", r)
request := reflect.New(reflect.TypeOf(h.RequestStruct)).Interface().(RequestParams)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
l.Error(err)
return
}
if err := json.Unmarshal(body, request); err != nil {
l.Errorf("Unable to decode JSON body in POST request (%s). Original body was: %s", err, string(body))
return
}
response, err := request.HandleRequest()
if err != nil {
l.Errorf("Failed to handle this request -- %s", err)
http.Error(w, err.Error(), 500)
} else {
data, err := json.Marshal(response)
if err != nil {
err = fmt.Errorf("Unable to response into JSON: %s", err)
http.Error(w, err.Error(), 500)
} else {
_, err = w.Write(data)
if err != nil {
l.Errorf("Unable to write http response: %s", err)
}
}
}
}