77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
//go:build windows
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package cli
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import (
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"context"
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"fmt"
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"os"
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"time"
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"golang.org/x/sys/windows"
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)
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func acquireSyncLock(ctx context.Context, path string) (func() error, error) {
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file, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0o600)
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if err != nil {
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return nil, fmt.Errorf("open sync lock: %w", err)
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}
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locked := false
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defer func() {
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if !locked {
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_ = file.Close()
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}
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}()
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ticker := time.NewTicker(200 * time.Millisecond)
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defer ticker.Stop()
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handle := windows.Handle(file.Fd())
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overlapped := &windows.Overlapped{}
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for {
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err = windows.LockFileEx(handle, windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY, 0, 1, 0, overlapped)
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if err == nil {
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locked = true
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_, _ = file.Seek(0, 0)
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_ = file.Truncate(0)
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_, _ = fmt.Fprintf(file, "pid=%d\n", os.Getpid())
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return func() error {
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unlockErr := windows.UnlockFileEx(handle, 0, 1, 0, overlapped)
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closeErr := file.Close()
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if unlockErr != nil {
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return unlockErr
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}
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return closeErr
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}, nil
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}
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select {
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case <-ctx.Done():
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return nil, syncLockErr(ctx, path)
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case <-ticker.C:
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}
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}
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}
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func tryAcquireSyncLock(path string) (func() error, bool, error) {
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file, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0o600)
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if err != nil {
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return nil, false, fmt.Errorf("open sync lock: %w", err)
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}
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handle := windows.Handle(file.Fd())
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overlapped := &windows.Overlapped{}
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err = windows.LockFileEx(handle, windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY, 0, 1, 0, overlapped)
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if err != nil {
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_ = file.Close()
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return nil, false, nil
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}
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_, _ = file.Seek(0, 0)
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_ = file.Truncate(0)
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_, _ = fmt.Fprintf(file, "pid=%d\n", os.Getpid())
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return func() error {
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unlockErr := windows.UnlockFileEx(handle, 0, 1, 0, overlapped)
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closeErr := file.Close()
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if unlockErr != nil {
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return unlockErr
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}
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return closeErr
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}, true, nil
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}
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