34 lines
715 B
Go
34 lines
715 B
Go
package ari
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import (
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"fmt"
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"os"
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"syscall"
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)
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type LockFile struct {
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path string
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file *os.File
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}
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func AcquireLock(path string) (*LockFile, error) {
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file, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0600)
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if err != nil {
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return nil, err
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}
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if err := syscall.Flock(int(file.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil {
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_ = file.Close()
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return nil, fmt.Errorf("ARI events listener lock is already held: %s", path)
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}
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_, _ = file.WriteString(fmt.Sprintf("%d\n", os.Getpid()))
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return &LockFile{path: path, file: file}, nil
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}
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func (l *LockFile) Release() error {
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if l == nil || l.file == nil {
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return nil
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}
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_ = syscall.Flock(int(l.file.Fd()), syscall.LOCK_UN)
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return l.file.Close()
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}
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