55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package remotecommand
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import (
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"fmt"
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"io"
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"io/ioutil"
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"k8s.io/apimachinery/pkg/util/runtime"
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)
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// errorStreamDecoder interprets the data on the error channel and creates a go error object from it.
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type errorStreamDecoder interface {
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decode(message []byte) error
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}
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// watchErrorStream watches the errorStream for remote command error data,
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// decodes it with the given errorStreamDecoder, sends the decoded error (or nil if the remote
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// command exited successfully) to the returned error channel, and closes it.
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// This function returns immediately.
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func watchErrorStream(errorStream io.Reader, d errorStreamDecoder) chan error {
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errorChan := make(chan error)
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go func() {
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defer runtime.HandleCrash()
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message, err := ioutil.ReadAll(errorStream)
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switch {
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case err != nil && err != io.EOF:
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errorChan <- fmt.Errorf("error reading from error stream: %s", err)
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case len(message) > 0:
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errorChan <- d.decode(message)
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default:
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errorChan <- nil
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}
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close(errorChan)
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}()
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return errorChan
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}
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