add Gone and UnsupportedMediaType http errors

- Fix some docs
- Fix some type interfaces

Author: stackus

README.md

@@ -24,6 +24,7 @@ that can then be shared between services.
 Type codes are strings that are returned by any error that implements `errors.TypeCoder`.
 
     type TypeCoder interface {
+        error
         TypeCode() string
     }
 
@@ -33,15 +34,17 @@ HTTP statuses are integer values that have defined in the `net/http` package and
 implements `errors.HTTPCoder`.
 
     type HTTPCoder interface {
+        error
         HTTPCode() int
     }
 
-### GRCP Codes
+### GRPC Codes
 
 GRPC codes are `codes.Code` are int64 values defined in the `google.golang.org/grpc/codes` package and are returned by
 any error that implements `errors.GRPCCoder`.
 
     type GRPCCoder interface {
+        error
         GRPCCode() codes.Code
     }
 

errors.go

@@ -7,6 +7,7 @@ import (
 
 // TypeCoder interface to extract an errors embeddable type as a string
 type TypeCoder interface {
+	error
 	TypeCode() string
 }
 

grpc.go

@@ -8,6 +8,7 @@ import (
 )
 
 type GRPCCoder interface {
+	error
 	GRPCCode() codes.Code
 }
 
@@ -62,6 +63,10 @@ func (e Error) GRPCCode() codes.Code {
 		return codes.DeadlineExceeded
 	case ErrConflict:
 		return codes.AlreadyExists
+	case ErrGone:
+		return codes.NotFound
+	case ErrUnsupportedMediaType:
+		return codes.InvalidArgument
 	case ErrImATeapot:
 		return codes.Unknown
 	case ErrUnprocessableEntity:

http.go

@@ -6,6 +6,7 @@ import (
 )
 
 type HTTPCoder interface {
+	error
 	HTTPCode() int
 }
 
@@ -60,6 +61,10 @@ func (e Error) HTTPCode() int {
 		return http.StatusRequestTimeout
 	case ErrConflict:
 		return http.StatusConflict
+	case ErrGone:
+		return http.StatusGone
+	case ErrUnsupportedMediaType:
+		return http.StatusUnsupportedMediaType
 	case ErrImATeapot:
 		return 418 // teapot support
 	case ErrUnprocessableEntity:

types.go

@@ -29,6 +29,8 @@ const (
 	ErrMethodNotAllowed           Error = "METHOD_NOT_ALLOWED"            // HTTP: 405 GRPC: codes.Unimplemented
 	ErrRequestTimeout             Error = "REQUEST_TIMEOUT"               // HTTP: 408 GRPC: codes.DeadlineExceeded
 	ErrConflict                   Error = "CONFLICT"                      // HTTP: 409 GRPC: codes.AlreadyExists
+	ErrGone                       Error = "GONE"                          // HTTP: 410 GRPC: codes.NotFound
+	ErrUnsupportedMediaType       Error = "UNSUPPORTED_MEDIA_TYPE"        // HTTP: 415 GRPC: codes.InvalidArgument
 	ErrImATeapot                  Error = "IM_A_TEAPOT"                   // HTTP: 418 GRPC: codes.Unknown
 	ErrUnprocessableEntity        Error = "UNPROCESSABLE_ENTITY"          // HTTP: 422 GRPC: codes.InvalidArgument
 	ErrTooManyRequests            Error = "TOO_MANY_REQUESTS"             // HTTP: 429 GRPC: codes.ResourceExhausted