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rzerror.go
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rzerror.go
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package rzerrors
import (
"bytes"
"fmt"
"net/http"
"github.com/kyawmyintthein/rzerrors/proto/errorpb"
"github.com/twitchtv/twirp"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const (
_unknownError = "unknown_error"
)
type RZError struct {
messageFormat string
cause error
args []interface{}
}
func NewRZError(messageFormat string, args ...interface{}) *RZError {
err := &RZError{
messageFormat: messageFormat,
args: args,
}
return err
}
func (e *RZError) GetArgs() []interface{} {
return e.args
}
func (e *RZError) GetMessage() string {
return e.messageFormat
}
func (e *RZError) GetFormattedMessage() string {
return fmt.Sprintf(e.messageFormat, e.args...)
}
func (e *RZError) Wrap(err error) {
e.cause = err
}
func (e *RZError) Error() string {
return fmt.Sprintf(e.messageFormat, e.args...)
}
func (w *RZError) Cause() error { return w.cause }
func Cause(err error) error {
type causer interface {
Cause() error
}
for err != nil {
cause, ok := err.(causer)
if !ok {
break
}
err = cause.Cause()
}
return err
}
func GetErrorMessages(e error) string {
return extractFullErrorMessage(e, false)
}
func GetErrorMessagesWithStack(e error) string {
return extractFullErrorMessage(e, true)
}
func extractFullErrorMessage(e error, includeStack bool) string {
type causer interface {
Cause() error
}
var ok bool
var lastClErr error
errMsg := bytes.NewBuffer(make([]byte, 0, 1024))
rzerr := e
for {
_, ok := rzerr.(StackTracer)
if ok {
lastClErr = rzerr
}
errorWithFormat, ok := rzerr.(ErrorFormatter)
if ok {
errMsg.WriteString(errorWithFormat.GetFormattedMessage())
}
errorCauser, ok := rzerr.(causer)
if ok {
innerErr := errorCauser.Cause()
if innerErr == nil {
break
}
rzerr = innerErr
} else {
// We have reached the end and traveresed all inner errors.
// Add last message and exit loop.
errMsg.WriteString(rzerr.Error())
break
}
errMsg.WriteString(", ")
}
stackError, ok := lastClErr.(StackTracer)
if includeStack && ok {
errMsg.WriteString("\nSTACK TRACE:\n")
errMsg.WriteString(stackError.GetStack())
}
return errMsg.String()
}
func ConvertGRPCStatusError(err error) error {
grpcCode := codes.Unknown
errorID := _unknownError
httpStatus := http.StatusInternalServerError
errorDescription := err.Error()
var args []interface{}
errorWithID, ok := err.(ErrorID)
if ok {
errorID = errorWithID.ID()
}
errorWithFormatter, ok := err.(ErrorFormatter)
if ok {
errorDescription = errorWithFormatter.GetFormattedMessage()
args = errorWithFormatter.GetArgs()
}
errorWithGrpcCode, ok := err.(GRPCError)
if ok {
grpcCode = errorWithGrpcCode.GRPCCode()
}
errorWithHTTPStatus, ok := err.(HTTPError)
if ok {
httpStatus = errorWithHTTPStatus.StatusCode()
}
var strArgs []string
for _, arg := range args {
strArgs = append(strArgs, fmt.Sprintf("%v", arg))
}
stat := status.New(grpcCode, errorID)
stat, _ = stat.WithDetails(&errorpb.ErrorMessage{
HttpStatusCode: int32(httpStatus),
MessageDescription: errorDescription,
Message: errorID,
Args: strArgs,
DebugInfo: GetErrorMessagesWithStack(err),
})
return stat.Err()
}
func ConvertTwirpError(err error) twirp.Error {
twirpErrorCode := twirp.Internal
errorDescription := err.Error()
errorWithTwirpCode, ok := err.(TwirpError)
if ok {
twirpErrorCode = errorWithTwirpCode.ErrorCode()
}
errorWithFormatter, ok := err.(ErrorFormatter)
if ok {
errorDescription = errorWithFormatter.GetFormattedMessage()
}
twirpErr := twirp.WrapError(twirp.NewError(twirpErrorCode, errorDescription), err)
errorWithID, ok := err.(ErrorID)
if ok {
errorID := errorWithID.ID()
twirpErr = twirpErr.WithMeta("error_id", errorID)
}
return twirpErr
}