| // Copyright 2016 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package prpc |
| |
| import ( |
| "fmt" |
| ) |
| |
| // protocolError is returned if a pRPC request is malformed. |
| type protocolError struct { |
| err error |
| status int // HTTP status to use in response. |
| } |
| |
| func (e *protocolError) Error() string { |
| return fmt.Sprintf("pRPC: %s", e.err) |
| } |
| |
| // withStatus wraps an error with an HTTP status. |
| // If err is nil, returns nil. |
| func withStatus(err error, status int) *protocolError { |
| if _, ok := err.(*protocolError); ok { |
| panic("protocolError in protocolError") |
| } |
| if err == nil { |
| return nil |
| } |
| return &protocolError{err, status} |
| } |
| |
| // errorf creates a new protocol error. |
| func errorf(status int, format string, a ...interface{}) *protocolError { |
| return withStatus(fmt.Errorf(format, a...), status) |
| } |