feat: add error cause for statck trace

cmd/protoc-gen-go-errors/errors.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"strings"
 
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
+
 	"github.com/go-kratos/kratos/cmd/protoc-gen-go-errors/v2/errors"
 	"google.golang.org/protobuf/compiler/protogen"
 	"google.golang.org/protobuf/proto"
@@ -14,6 +17,8 @@ const (
 	fmtPackage    = protogen.GoImportPath("fmt")
 )
 
+var enCases = cases.Title(language.AmericanEnglish)
+
 // generateFile generates a _errors.pb.go file containing kratos errors definitions.
 func generateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile {
 	if len(file.Enums) == 0 {
@@ -98,10 +103,10 @@ func case2Camel(name string) string {
 		if upperName == name {
 			name = strings.ToLower(name)
 		}
-		return strings.Title(name)
+		return enCases.String(name)
 	}
 	name = strings.ToLower(name)
 	name = strings.Replace(name, "_", " ", -1)
-	name = strings.Title(name)
+	name = enCases.String(name)
 	return strings.Replace(name, " ", "", -1)
 }

cmd/protoc-gen-go-errors/go.mod

@@ -2,4 +2,7 @@ module github.com/go-kratos/kratos/cmd/protoc-gen-go-errors/v2
 
 go 1.16
 
-require google.golang.org/protobuf v1.27.1
+require (
+	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.27.1
+)

cmd/protoc-gen-go-errors/go.sum

@@ -1,6 +1,9 @@
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=

cmd/protoc-gen-go-http/http.go

@@ -8,7 +8,6 @@ import (
 
 	"google.golang.org/protobuf/reflect/protoreflect"
 
-	"github.com/go-kratos/kratos/v2"
 	"google.golang.org/genproto/googleapis/api/annotations"
 	"google.golang.org/protobuf/compiler/protogen"
 	"google.golang.org/protobuf/proto"
@@ -32,7 +31,7 @@ func generateFile(gen *protogen.Plugin, file *protogen.File, omitempty bool) *pr
 	g := gen.NewGeneratedFile(filename, file.GoImportPath)
 	g.P("// Code generated by protoc-gen-go-http. DO NOT EDIT.")
 	g.P("// versions:")
-	g.P(fmt.Sprintf("// protoc-gen-go-http %s", kratos.Release))
+	g.P(fmt.Sprintf("// protoc-gen-go-http %s", release))
 	g.P()
 	g.P("package ", file.GoPackageName)
 	g.P()

errors/errors.go

@@ -7,9 +7,10 @@ import (
 	httpstatus "github.com/go-kratos/kratos/v2/transport/http/status"
 	"google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc/status"
-	"google.golang.org/protobuf/proto"
 )
 
+//go:generate protoc -I. --go_out=paths=source_relative:. errors.proto
+
 const (
 	// UnknownCode is unknown code for error info.
 	UnknownCode = 500
@@ -19,21 +20,18 @@ const (
 	SupportPackageIsVersion1 = true
 )
 
-//go:generate protoc -I. --go_out=paths=source_relative:. errors.proto
+// Error is a status error.
+type Error struct {
+	Status
+	cause error
+}
 
 func (e *Error) Error() string {
-	return fmt.Sprintf("error: code = %d reason = %s message = %s metadata = %v", e.Code, e.Reason, e.Message, e.Metadata)
+	return fmt.Sprintf("error: code = %d reason = %s message = %s metadata = %v cause = %v", e.Code, e.Reason, e.Message, e.Metadata, e.cause)
 }
 
-// GRPCStatus returns the Status represented by se.
-func (e *Error) GRPCStatus() *status.Status {
-	s, _ := status.New(httpstatus.ToGRPCCode(int(e.Code)), e.Message).
-		WithDetails(&errdetails.ErrorInfo{
-			Reason:   e.Reason,
-			Metadata: e.Metadata,
-		})
-	return s
-}
+// Unwrap provides compatibility for Go 1.13 error chains.
+func (e *Error) Unwrap() error { return e.cause }
 
 // Is matches each error in the chain with the target value.
 func (e *Error) Is(err error) bool {
@@ -43,19 +41,38 @@ func (e *Error) Is(err error) bool {
 	return false
 }
 
+// WithCause with the underlying cause of the error.
+func (e *Error) WithCause(cause error) *Error {
+	err := Clone(e)
+	err.cause = cause
+	return err
+}
+
 // WithMetadata with an MD formed by the mapping of key, value.
 func (e *Error) WithMetadata(md map[string]string) *Error {
-	err := proto.Clone(e).(*Error)
+	err := Clone(e)
 	err.Metadata = md
 	return err
 }
 
+// GRPCStatus returns the Status represented by se.
+func (e *Error) GRPCStatus() *status.Status {
+	s, _ := status.New(httpstatus.ToGRPCCode(int(e.Code)), e.Message).
+		WithDetails(&errdetails.ErrorInfo{
+			Reason:   e.Reason,
+			Metadata: e.Metadata,
+		})
+	return s
+}
+
 // New returns an error object for the code, message.
 func New(code int, reason, message string) *Error {
 	return &Error{
-		Code:    int32(code),
-		Message: message,
-		Reason:  reason,
+		Status: Status{
+			Code:    int32(code),
+			Message: message,
+			Reason:  reason,
+		},
 	}
 }
 
@@ -87,6 +104,23 @@ func Reason(err error) string {
 	return FromError(err).Reason
 }
 
+// Clone deep clone error to a new error.
+func Clone(err *Error) *Error {
+	metadata := make(map[string]string, len(err.Metadata))
+	for k, v := range err.Metadata {
+		metadata[k] = v
+	}
+	return &Error{
+		cause: err.cause,
+		Status: Status{
+			Code:     err.Code,
+			Reason:   err.Reason,
+			Message:  err.Message,
+			Metadata: metadata,
+		},
+	}
+}
+
 // FromError try to convert an error to *Error.
 // It supports wrapped errors.
 func FromError(err error) *Error {