mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-02-14 18:09:57 +00:00
49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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 filelog
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import (
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"fmt"
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"io"
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"os"
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"k8s.io/node-problem-detector/third_party/forked/cadvisor/tail"
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)
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// getLogReader returns log reader for filelog log. Note that getLogReader doesn't look back
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// to the rolled out logs.
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func getLogReader(path string) (io.ReadCloser, error) {
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if path == "" {
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return nil, fmt.Errorf("unexpected empty log path")
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}
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// To handle log rotation, tail will not report error immediately if
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// the file doesn't exist. So we check file existence first.
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// This could go wrong during mid-rotation. It should recover after
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// several restart when the log file is created again. The chance
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// is slim but we should still fix this in the future.
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// TODO(random-liu): Handle log missing during rotation.
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_, err := os.Stat(path)
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if err != nil {
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return nil, fmt.Errorf("failed to stat the file %q: %v", path, err)
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}
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tail, err := tail.NewTail(path)
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if err != nil {
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return nil, fmt.Errorf("failed to tail the file %q: %v", path, err)
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}
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return tail, nil
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}
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