feat: bootstrap durable server store

internal/server/store/lock_windows.go

@@ -0,0 +1,33 @@
+//go:build windows
+
+package store
+
+import (
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+func acquireInstanceLock(path string) (func() error, error) {
+	if err := ensurePrivateFile(path); err != nil {
+		return nil, err
+	}
+	file, err := os.OpenFile(path, os.O_RDWR, 0)
+	if err != nil {
+		return nil, err
+	}
+	var overlapped windows.Overlapped
+	err = windows.LockFileEx(windows.Handle(file.Fd()), windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY, 0, 1, 0, &overlapped)
+	if err != nil {
+		_ = file.Close()
+		return nil, ErrAlreadyOpen
+	}
+	return func() error {
+		unlockErr := windows.UnlockFileEx(windows.Handle(file.Fd()), 0, 1, 0, &overlapped)
+		closeErr := file.Close()
+		if unlockErr != nil {
+			return unlockErr
+		}
+		return closeErr
+	}, nil
+}