| // Copyright 2017 Google LLC |
| // |
| // 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 internal |
| |
| import ( |
| "fmt" |
| |
| "google.golang.org/api/googleapi" |
| "google.golang.org/grpc/status" |
| ) |
| |
| // Annotate prepends msg to the error message in err, attempting |
| // to preserve other information in err, like an error code. |
| // |
| // Annotate panics if err is nil. |
| // |
| // Annotate knows about these error types: |
| // - "google.golang.org/grpc/status".Status |
| // - "google.golang.org/api/googleapi".Error |
| // If the error is not one of these types, Annotate behaves |
| // like |
| // fmt.Errorf("%s: %v", msg, err) |
| func Annotate(err error, msg string) error { |
| if err == nil { |
| panic("Annotate called with nil") |
| } |
| if s, ok := status.FromError(err); ok { |
| p := s.Proto() |
| p.Message = msg + ": " + p.Message |
| return status.ErrorProto(p) |
| } |
| if g, ok := err.(*googleapi.Error); ok { |
| g.Message = msg + ": " + g.Message |
| return g |
| } |
| return fmt.Errorf("%s: %v", msg, err) |
| } |
| |
| // Annotatef uses format and args to format a string, then calls Annotate. |
| func Annotatef(err error, format string, args ...interface{}) error { |
| return Annotate(err, fmt.Sprintf(format, args...)) |
| } |