failure是用于处理应用程序错误的实用程序包（failure和error的区别）

failure是用于处理应用程序错误的实用程序包（failure和error的区别）

failure

Package failure provides an error represented as error code and extensible error interface with wrappers.

Use error code instead of error type.

var NotFound failure.StringCode = "NotFound"err := failure.New(NotFound)if failure.Is(err, NotFound) { // true r.WriteHeader(http.StatusNotFound)}

Wrap errors.

type Wrapper interface { WrapError(err error) error}err := failure.Wrap(err, MarkTemporary())

Unwrap errors with Iterator.

type Unwrapper interface { UnwrapError() error}i := failure.NewIterator(err)for i.Next() { // unwrap error err := i.Error() if e, ok := err.(Temporary); ok { return e.IsTemporary() }}

Example

You can try it on The Go Playground

You can also see the example on GitHub by opening this.

package mainimport ( "fmt" "io" "net/http" "net/http/httptest" "net/http/httputil" "github.com/morikuni/failure")// error codes for your application.const ( NotFound failure.StringCode = "NotFound" Forbidden failure.StringCode = "Forbidden")func GetACL(projectID, userID string) (acl interface{}, e error) { notFound := true if notFound { return nil, failure.New(NotFound, failure.Context{"project_id": projectID, "user_id": userID}, ) } return nil, failure.Unexpected("unexpected error")}func GetProject(projectID, userID string) (project interface{}, e error) { _, err := GetACL(projectID, userID) if err != nil { if failure.Is(err, NotFound) { return nil, failure.Translate(err, Forbidden, failure.Message("no acl exists"), failure.Context{"additional_info": "hello"}, ) } return nil, failure.Wrap(err) } return nil, nil}func Handler(w http.ResponseWriter, r *http.Request) { _, err := GetProject(r.FormValue("project_id"), r.FormValue("user_id")) if err != nil { HandleError(w, err) return }}func getHTTPStatus(err error) int { c, ok := failure.CodeOf(err) if !ok { return http.StatusInternalServerError } switch c { case NotFound: return http.StatusNotFound case Forbidden: return http.StatusForbidden default: return http.StatusInternalServerError }}func getMessage(err error) string { msg, ok := failure.MessageOf(err) if ok { return msg } return "Error"}func HandleError(w http.ResponseWriter, err error) { w.WriteHeader(getHTTPStatus(err)) io.WriteString(w, getMessage(err)) fmt.Println("============ Error ============") fmt.Printf("Error = %v\n", err) code, _ := failure.CodeOf(err) fmt.Printf("Code = %v\n", code) msg, _ := failure.MessageOf(err) fmt.Printf("Message = %v\n", msg) cs, _ := failure.CallStackOf(err) fmt.Printf("CallStack = %v\n", cs) fmt.Printf("Cause = %v\n", failure.CauseOf(err)) fmt.Println() fmt.Println("============ Detail ============") fmt.Printf("%+v\n", err) // [main.GetProject] /go/src/github.com/morikuni/failure/example/main.go:36 // message("no acl exists") // additional_info = hello // code(Forbidden) // [main.GetACL] /go/src/github.com/morikuni/failure/example/main.go:21 // project_id = 123 // user_id = 456 // code(NotFound) // [CallStack] // [main.GetACL] /go/src/github.com/morikuni/failure/example/main.go:21 // [main.GetProject] /go/src/github.com/morikuni/failure/example/main.go:33 // [main.Handler] /go/src/github.com/morikuni/failure/example/main.go:47 // [http.HandlerFunc.ServeHTTP] /usr/local/go/src/net/http/server.go:1964 // [http.(*ServeMux).ServeHTTP] /usr/local/go/src/net/http/server.go:2361 // [http.serverHandler.ServeHTTP] /usr/local/go/src/net/http/server.go:2741 // [http.(*conn).serve] /usr/local/go/src/net/http/server.go:1847 // [runtime.goexit] /usr/local/go/src/runtime/asm_amd64.s:1333}func main() { req := httptest.NewRequest(http.MethodGet, "/?project_id=aaa&user_id=111", nil) rec := httptest.NewRecorder() Handler(rec, req) res, _ := httputil.DumpResponse(rec.Result(), true) fmt.Println("============ Dump ============") fmt.Println(string(res))}

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