common/prpc, tools/cmd/cproto: prpc client

server/prpc/error.go

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package prpc
 
 import "fmt"
 
 // httpError is an error with HTTP status.
 // Many internal functions return *httpError instead of error
 // to guarantee expected HTTP status via type-system.
 // Supported by ErrorStatus and ErrorDesc.
 type httpError struct {
         err    error
         status int
 }
 
 func (e *httpError) Error() string {
         return fmt.Sprintf("HTTP %d: %s", e.status, e.err)
 }
 
+func (e *httpError) InnerError() error {
+        return e.err
+}
+
 // withStatus wraps an error with an HTTP status.
 // If err is nil, returns nil.
 func withStatus(err error, status int) *httpError {
         if _, ok := err.(*httpError); ok {
                 panicf("httpError in httpError")
         }
         if err == nil {
                 return nil
         }
         return &httpError{err, status}
 }
 
 // errorf creates a new error with an HTTP status.
 func errorf(status int, format string, a ...interface{}) *httpError {
         return withStatus(fmt.Errorf(format, a...), status)
 }
 
 // Errorf creates a new error with an HTTP status.
 //
 // See also grpc.Errorf that accepts a gRPC code.
 func Errorf(status int, format string, a ...interface{}) error {
         return errorf(status, format, a...)
 }
 
 func panicf(format string, a ...interface{}) {
         panic(fmt.Errorf(format, a...))
 }