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package helper
import (
"fmt"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// Unimplemented is a Go error with gRPC error code 'Unimplemented'
var Unimplemented = status.Errorf(codes.Unimplemented, "this rpc is not implemented")
// DecorateError unless it's already a grpc error.
// If given nil it will return nil.
func DecorateError(code codes.Code, err error) error {
if err != nil && GrpcCode(err) == codes.Unknown {
return status.Errorf(code, "%v", err)
}
return err
}
// ErrInternal wrappes err with codes.Internal, unless err is already a grpc error
func ErrInternal(err error) error { return DecorateError(codes.Internal, err) }
// ErrInvalidArgument wraps err with codes.InvalidArgument, unless err is already a grpc error
func ErrInvalidArgument(err error) error { return DecorateError(codes.InvalidArgument, err) }
// ErrInvalidArgumentf wraps err with codes.InvalidArgument, unless err is already a grpc error
func ErrInvalidArgumentf(format string, a ...interface{}) error {
return DecorateError(codes.InvalidArgument, fmt.Errorf(format, a...))
}
// ErrPreconditionFailed wraps err with codes.FailedPrecondition, unless err is already a grpc error
func ErrPreconditionFailed(err error) error { return DecorateError(codes.FailedPrecondition, err) }
// ErrPreconditionFailedf wraps err with codes.FailedPrecondition, unless err is already a grpc error
func ErrPreconditionFailedf(format string, a ...interface{}) error {
return DecorateError(codes.FailedPrecondition, fmt.Errorf(format, a...))
}
// ErrNotFound wraps error with codes.NotFound, unless err is already a grpc error
func ErrNotFound(err error) error { return DecorateError(codes.NotFound, err) }
// GrpcCode emulates the old grpc.Code function: it translates errors into codes.Code values.
func GrpcCode(err error) codes.Code {
if err == nil {
return codes.OK
}
st, ok := status.FromError(err)
if !ok {
return codes.Unknown
}
return st.Code()
}
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