mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 15:09:56 +00:00
119 lines
2.5 KiB
Go
119 lines
2.5 KiB
Go
/*
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Copyright 2023 ceph-csi 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 healthchecker
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import (
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"errors"
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"os"
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"path"
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"time"
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)
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type fileChecker struct {
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checker
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// filename contains the filename that is used for checking.
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filename string
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}
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func newFileChecker(dir string) ConditionChecker {
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fc := &fileChecker{
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filename: path.Join(dir, "csi-volume-condition.ts"),
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}
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fc.initDefaults()
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fc.checker.runChecker = func() {
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fc.isRunning = true
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ticker := time.NewTicker(fc.interval)
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defer ticker.Stop()
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for {
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select {
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case <-fc.commands: // STOP command received
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fc.isRunning = false
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return
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case now := <-ticker.C:
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err := fc.writeTimestamp(now)
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if err != nil {
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fc.mutex.Lock()
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fc.healthy = false
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fc.err = err
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fc.mutex.Unlock()
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continue
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}
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ts, err := fc.readTimestamp()
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if err != nil {
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fc.mutex.Lock()
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fc.healthy = false
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fc.err = err
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fc.mutex.Unlock()
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continue
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}
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// verify that the written timestamp is read back
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if now.Compare(ts) != 0 {
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fc.mutex.Lock()
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fc.healthy = false
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fc.err = errors.New("timestamp read from file does not match what was written")
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fc.mutex.Unlock()
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continue
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}
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// run health check, write a timestamp to a file, read it back
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fc.mutex.Lock()
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fc.healthy = true
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fc.err = nil
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fc.lastUpdate = ts
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fc.mutex.Unlock()
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}
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}
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}
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return fc
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}
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// readTimestamp reads the JSON formatted timestamp from the file.
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func (fc *fileChecker) readTimestamp() (time.Time, error) {
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var ts time.Time
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data, err := os.ReadFile(fc.filename)
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if err != nil {
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return ts, err
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}
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err = ts.UnmarshalJSON(data)
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return ts, err
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}
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// writeTimestamp writes the timestamp to the file in JSON format.
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func (fc *fileChecker) writeTimestamp(ts time.Time) error {
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data, err := ts.MarshalJSON()
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if err != nil {
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return err
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}
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//nolint:gosec // allow reading of the timestamp for debugging
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return os.WriteFile(fc.filename, data, 0o644)
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}
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