69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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func lockFilePath() string {
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return filepath.Join(userDataDir(), ".hpltoolbox.lock")
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}
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// focusExistingInstance returns true if another instance was found and
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// successfully asked to focus its window. In that case the caller should exit.
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// Returns false if no live instance exists (and clears any stale lock).
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func focusExistingInstance() bool {
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data, err := os.ReadFile(lockFilePath())
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if err != nil {
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return false
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}
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parts := strings.Split(strings.TrimSpace(string(data)), "\n")
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if len(parts) != 2 {
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_ = os.Remove(lockFilePath())
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return false
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}
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pid, errPid := strconv.Atoi(strings.TrimSpace(parts[0]))
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port, errPort := strconv.Atoi(strings.TrimSpace(parts[1]))
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if errPid != nil || errPort != nil {
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_ = os.Remove(lockFilePath())
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return false
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}
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// Quick liveness check: PID must exist.
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if proc, err := os.FindProcess(pid); err != nil || proc == nil {
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_ = os.Remove(lockFilePath())
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return false
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}
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// Ask the running instance to focus its window.
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client := &http.Client{Timeout: 1500 * time.Millisecond}
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url := fmt.Sprintf("http://127.0.0.1:%d/api/focus", port)
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resp, err := client.Post(url, "application/json", bytes.NewReader(nil))
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if err != nil {
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// Lock file is stale (process died but didn't clean up).
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_ = os.Remove(lockFilePath())
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return false
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}
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_ = resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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_ = os.Remove(lockFilePath())
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return false
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}
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return true
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}
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func writeLockFile(port int) error {
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content := fmt.Sprintf("%d\n%d\n", os.Getpid(), port)
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return os.WriteFile(lockFilePath(), []byte(content), 0644)
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}
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func removeLockFile() {
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_ = os.Remove(lockFilePath())
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}
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