func MarshalResponseMiddleware(registry kit.Registry, request kit.Request, response kit.Response) (kit.Response, bool) {
js, err := json.Marshal(response.GetData())
if err != nil {
js = []byte(`{"errors": [{code: "response_marshal_error"}]}`)
}
response.SetRawData(js)
return nil, false
}
func convertResponse(response kit.Response) *turnpike.CallResult {
result := &turnpike.CallResult{}
if response.GetError() != nil {
result.Err = turnpike.URI(response.GetError().GetCode())
}
result.Kwargs = map[string]interface{}{
"data": response.GetData(),
"meta": response.GetMeta(),
"errors": []error{response.GetError()},
}
return result
}
func processRequest(registry kit.Registry, request kit.Request, handler kit.RequestHandler) (kit.Response, bool) {
var response kit.Response
// Run before middlewares.
for _, middleware := range registry.HttpFrontend().BeforeMiddlewares() {
var skip bool
response, skip = middleware(registry, request)
if skip {
return nil, true
} else if response != nil {
break
}
}
// Only run the handler if no middleware provided a response.
if response == nil {
skip := false
response, skip = handler(registry, request)
if skip {
return nil, true
}
}
if response.GetHttpStatus() == 0 {
// Note: error handler middleware will set proper http status for error responses.
response.SetHttpStatus(200)
}
// Run after request middlewares.
// Note: error responses are converted with the serverErrrorMiddleware middleware.
// Note: serializing the response into the proper format is done with the SerializeResponseMiddleware.
for _, middleware := range registry.HttpFrontend().AfterMiddlewares() {
resp, skip := middleware(registry, request, response)
if skip {
return nil, true
} else if resp != nil {
response = resp
}
}
return response, false
}
func SerializeResponseMiddleware(registry kit.Registry, request kit.Request, response kit.Response) (kit.Response, bool) {
// Try to serialize the reponse data.
// Determine serializer.
serializer := registry.DefaultSerializer()
// Check if a custom serializer was specified.
if name := request.GetContext().String("response-serializer"); name != "" {
serializer = registry.Serializer(name)
if serializer == nil {
errResp := kit.NewErrorResponse("unknown_response_serializer", true)
data, _ := serializer.MustSerializeResponse(errResp)
errResp.SetData(data)
return errResp, false
}
}
// Set format in metadata.
meta := response.GetMeta()
if meta == nil {
meta = make(map[string]interface{})
}
meta["format"] = serializer.Name()
response.SetMeta(meta)
data, err := serializer.MustSerializeResponse(response)
if err != nil {
registry.Logger().Errorf("Response serialization error: %v (%+v)", err, response)
}
response.SetData(data)
return nil, false
}
// SerializeResponse converts a response with model data into the target format.
func (s *Serializer) SerializeResponse(response kit.Response) (interface{}, apperror.Error) {
transData := response.GetTransferData()
if transData == nil {
transData = &kit.AppTransferData{}
data := response.GetData()
if model, ok := data.(kit.Model); ok {
transData.SetModels([]kit.Model{model})
} else if models, ok := data.([]kit.Model); ok {
transData.SetModels(models)
} else {
transData.SetData(data)
}
}
// Append response metadata.
if meta := response.GetMeta(); meta != nil {
transMeta := transData.GetMeta()
if transMeta != nil {
for key, val := range meta {
transMeta[key] = val
}
} else {
transData.SetMeta(meta)
}
}
// If a response error is defined, prepend it to all errors that might have been in
// TransferData.
if err := response.GetError(); err != nil {
oldErrs := transData.GetErrors()
transData.SetErrors(append([]apperror.Error{err}, oldErrs...))
}
data, err := s.SerializeTransferData(transData)
if err != nil {
return nil, err
}
return data, nil
}
func RespondWithJson(w http.ResponseWriter, response kit.Response) {
code := 200
respData := map[string]interface{}{
"data": response.GetData(),
}
if response.GetError() != nil {
errs := []error{response.GetError()}
additionalErrs := response.GetError().GetErrors()
if additionalErrs != nil {
for _, err := range additionalErrs {
if apiErr, ok := err.(apperror.Error); ok && apiErr.IsPublic() {
errs = append(errs, apiErr)
}
}
}
respData["errors"] = errs
code = 500
}
output, err2 := json.Marshal(respData)
if err2 != nil {
code = 500
respData = map[string]interface{}{
"errors": []error{
apperror.Wrap(err2, "json_encode_error"),
},
}
output, _ = json.Marshal(respData)
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
w.Write(output)
}
func (f *Frontend) registerMethod(method kit.Method) {
f.client.Register(method.GetName(), func(args []interface{}, kwargs map[string]interface{}, details map[string]interface{}) (result *turnpike.CallResult) {
methodName := method.GetName()
fmt.Printf("WAMP method %v |\n data: %v |\n details: %v\n", methodName, kwargs, details)
request := kit.NewRequest()
request.SetFrontend("wamp")
request.SetPath("/method/" + methodName)
request.SetData(kwargs)
var response kit.Response
// Find session.
sessionId := uint(details["session_id"].(turnpike.ID))
session := f.sessions[sessionId]
if session == nil {
s, err := f.registry.UserService().StartSession(nil, "wamp")
if err != nil {
response = kit.NewErrorResponse(err)
} else {
f.sessions[sessionId] = s
session = s
}
}
request.SetSession(session)
if session.GetUser() != nil {
request.SetUser(session.GetUser())
}
// Run before middlewares.
for _, middleware := range f.beforeMiddlewares {
resp, skip := middleware(f.registry, request)
if skip {
panic("WAMP frontend middlewares do not support skipping.")
} else if resp != nil {
response = resp
break
}
}
// Run the method.
if response == nil {
responder := func(r kit.Response) {
response = r
}
finishedChannel, err := f.registry.App().RunMethod(methodName, request, responder, true)
if err != nil {
response = kit.NewErrorResponse(err)
} else {
<-finishedChannel
}
}
// Run after middlewares.
for _, middleware := range f.afterMiddlewares {
resp, skip := middleware(f.registry, request, response)
if skip {
panic("WAMP frontend middlewares do not support skipping.")
}
if resp != nil {
response = resp
}
}
return &turnpike.CallResult{Kwargs: response.GetData().(map[string]interface{})}
}, nil)
}
func ServerErrorMiddleware(registry kit.Registry, r kit.Request, response kit.Response) (kit.Response, bool) {
err := response.GetError()
if err == nil {
return nil, false
}
status := 500
// If the error is an apperror, and it contains a status,
// set it as the http status of the response.
if apperr, ok := err.(apperror.Error); ok {
if apperr.GetStatus() != 0 {
status = apperr.GetStatus()
}
}
response.SetHttpStatus(status)
if response.GetRawData() != nil || response.GetRawDataReader() != nil {
return nil, false
}
httpRequest := r.GetHttpRequest()
apiPrefix := "/" + registry.Config().UString("api.prefix", "api")
isApiRequest := strings.HasPrefix(httpRequest.URL.Path, apiPrefix)
if isApiRequest {
return nil, false
}
data := map[string]interface{}{"errors": []error{response.GetError()}}
tpl := defaultErrorTpl()
tplPath := registry.Config().UString("frontend.errorTemplate")
if tplPath != "" {
t, err := template.ParseFiles(tplPath)
if err != nil {
registry.Logger().Fatalf("Could not parse error template at '%v': %v", tplPath, err)
} else {
tpl = t
}
}
var buffer *bytes.Buffer
if err := tpl.Execute(buffer, data); err != nil {
registry.Logger().Fatalf("Could not render error template: %v\n", err)
response.SetRawData([]byte("Server error"))
} else {
response.SetRawData(buffer.Bytes())
}
return nil, false
}
func RequestLoggerMiddleware(registry kit.Registry, r kit.Request, response kit.Response) (kit.Response, bool) {
// Calculate time taken.
rawStarted, ok1 := r.GetContext().Get("startTime")
rawFinished, ok2 := r.GetContext().Get("endTime")
timeTaken := int64(-1)
if ok1 && ok2 {
started := rawStarted.(time.Time)
finished := rawFinished.(time.Time)
timeTaken = int64(finished.Sub(started) / time.Millisecond)
}
// Log the request.
method := r.GetHttpMethod()
path := r.GetPath()
if response.GetError() != nil {
registry.Logger().WithFields(logrus.Fields{
"frontend": r.GetFrontend(),
"action": "request",
"method": method,
"path": path,
"status": response.GetHttpStatus(),
"err": response.GetError(),
"milliseconds": timeTaken,
}).Errorf("%v: %v - %v - %v", response.GetHttpStatus(), method, path, response.GetError())
} else {
registry.Logger().WithFields(logrus.Fields{
"frontend": r.GetFrontend(),
"action": "request",
"method": method,
"path": path,
"status": response.GetHttpStatus(),
"milliseconds": timeTaken,
}).Debugf("%v: %v - %v", response.GetHttpStatus(), method, path)
}
return nil, false
}
