| // Copyright 2021-2023 Buf Technologies, Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package triple_protocol_test |
| |
| import ( |
| "errors" |
| "io" |
| "log" |
| "net/http" |
| ) |
| |
| import ( |
| tri "dubbo.apache.org/dubbo-go/v3/protocol/triple/triple_protocol" |
| ) |
| |
| // NewHelloHandler is an example HTTP handler. In a real application, it might |
| // handle RPCs, requests for HTML, or anything else. |
| func NewHelloHandler() http.Handler { |
| return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) { |
| io.WriteString(response, "Hello, world!") |
| }) |
| } |
| |
| // NewAuthenticatedHandler is an example of middleware that works with both RPC |
| // and non-RPC clients. |
| func NewAuthenticatedHandler(handler http.Handler) http.Handler { |
| errorWriter := tri.NewErrorWriter() |
| return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) { |
| // Dummy authentication logic. |
| if request.Header.Get("Token") == "super-secret" { |
| handler.ServeHTTP(response, request) |
| return |
| } |
| defer request.Body.Close() |
| defer io.Copy(io.Discard, request.Body) |
| if errorWriter.IsSupported(request) { |
| // Send a protocol-appropriate error to RPC clients, so that they receive |
| // the right code, message, and any metadata or error details. |
| unauthenticated := tri.NewError(tri.CodeUnauthenticated, errors.New("invalid token")) |
| errorWriter.Write(response, request, unauthenticated) |
| } else { |
| // Send an error to non-RPC clients. |
| response.WriteHeader(http.StatusUnauthorized) |
| io.WriteString(response, "invalid token") |
| } |
| }) |
| } |
| |
| func ExampleErrorWriter() { |
| mux := http.NewServeMux() |
| mux.Handle("/", NewHelloHandler()) |
| srv := &http.Server{ |
| Addr: ":8080", |
| Handler: NewAuthenticatedHandler(mux), |
| } |
| if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) { |
| log.Fatalln(err) |
| } |
| } |