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errorx.go

@@ -0,0 +1,135 @@
+package errorx
+
+import (
+	"encoding/json"
+	"errors"
+
+	"google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+const defaultCode = 400
+
+type Errorx struct {
+	list []CodeError
+}
+
+type CodeError struct {
+	*status.Status
+	// Code    int    `json:"code"`
+	// Message string `json:"message"`
+}
+
+func NewCodeError(code int, msg string) error {
+	return &Errorx{
+		list: []CodeError{
+			{
+				status.New(codes.Code(code), msg),
+				// Code:    code,
+				// Message: msg,
+			},
+		},
+	}
+}
+
+func New(msg string) error {
+	return NewCodeError(defaultCode, msg)
+}
+
+func WithError(err error, msg string) error {
+	if err == nil {
+		return NewCodeError(defaultCode, msg)
+	}
+	e, ok := err.(*Errorx)
+	if ok {
+		e.list = append(e.list, CodeError{
+			status.New(codes.Code(defaultCode), msg),
+			// Code:    defaultCode,
+			// Message: msg,
+		})
+		return e
+	} else {
+		return &Errorx{
+			list: []CodeError{
+				{
+					status.New(codes.Code(defaultCode), msg),
+					// Code:    defaultCode,
+					// Message: err.Error(),
+				},
+				{
+					status.New(codes.Code(defaultCode), msg),
+					// Code:    defaultCode,
+					// Message: msg,
+				},
+			},
+		}
+	}
+}
+
+func (e *Errorx) Error() string {
+	c := len(e.list)
+	if c == 0 {
+		return ""
+	}
+
+	return e.list[c-1].Message()
+}
+
+func (e *Errorx) Code() int {
+	c := len(e.list)
+	if c == 0 {
+		return 200
+	}
+	return int(e.list[c-1].Code())
+}
+
+func FromError(err error) (s *status.Status, ok bool) {
+	if err == nil {
+		return nil, true
+	}
+	type grpcstatus interface{ GRPCStatus() *status.Status }
+	if gs, ok := err.(grpcstatus); ok {
+		if gs.GRPCStatus() == nil {
+			// Error has status nil, which maps to codes.OK. There
+			// is no sensible behavior for this, so we turn it into
+			// an error with codes.Unknown and discard the existing
+			// status.
+			return status.New(codes.Unknown, err.Error()), false
+		}
+		return gs.GRPCStatus(), true
+	}
+	var gs grpcstatus
+	if errors.As(err, &gs) {
+		if gs.GRPCStatus() == nil {
+			// Error wraps an error that has status nil, which maps
+			// to codes.OK.  There is no sensible behavior for this,
+			// so we turn it into an error with codes.Unknown and
+			// discard the existing status.
+			return status.New(codes.Unknown, err.Error()), false
+		}
+		p := gs.GRPCStatus().Proto()
+		p.Message = err.Error()
+		return status.FromProto(p), true
+	}
+	return status.New(codes.Unknown, err.Error()), false
+}
+
+func (e *Errorx) GRPCStatus() *status.Status {
+	c := len(e.list)
+	if c == 0 {
+		return nil
+	}
+	return e.list[c-1].Status
+}
+func (e *Errorx) Is(target error) bool {
+	return true
+}
+
+func (e *Errorx) Data() []CodeError {
+	return e.list
+}
+
+func (e *Errorx) String() string {
+	b, _ := json.Marshal(e.list)
+	return string(b)
+}