56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
|
/*
|
||
|
|
Copyright 2016 The Kubernetes 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 remotecommand
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"io/ioutil"
|
||
|
|
|
||
|
|
"k8s.io/apimachinery/pkg/util/runtime"
|
||
|
|
)
|
||
|
|
|
||
|
|
// errorStreamDecoder interprets the data on the error channel and creates a go error object from it.
|
||
|
|
type errorStreamDecoder interface {
|
||
|
|
decode(message []byte) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// watchErrorStream watches the errorStream for remote command error data,
|
||
|
|
// decodes it with the given errorStreamDecoder, sends the decoded error (or nil if the remote
|
||
|
|
// command exited successfully) to the returned error channel, and closes it.
|
||
|
|
// This function returns immediately.
|
||
|
|
func watchErrorStream(errorStream io.Reader, d errorStreamDecoder) chan error {
|
||
|
|
errorChan := make(chan error)
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
defer runtime.HandleCrash()
|
||
|
|
|
||
|
|
message, err := ioutil.ReadAll(errorStream)
|
||
|
|
switch {
|
||
|
|
case err != nil && err != io.EOF:
|
||
|
|
errorChan <- fmt.Errorf("error reading from error stream: %s", err)
|
||
|
|
case len(message) > 0:
|
||
|
|
errorChan <- d.decode(message)
|
||
|
|
default:
|
||
|
|
errorChan <- nil
|
||
|
|
}
|
||
|
|
close(errorChan)
|
||
|
|
}()
|
||
|
|
|
||
|
|
return errorChan
|
||
|
|
}
|