mirror of
https://github.com/wailsapp/wails.git
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93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
//go:build darwin
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// +build darwin
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package darwin
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/*
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#cgo CFLAGS: -x objective-c
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#cgo LDFLAGS: -framework Foundation -framework Cocoa
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#import "AppDelegate.h"
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*/
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import "C"
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import (
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"encoding/json"
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"fmt"
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"github.com/wailsapp/wails/v2/pkg/options"
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"os"
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"strings"
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"syscall"
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"unsafe"
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)
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func SetupSingleInstance(uniqueID string) {
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lockFilePath := getTempDir()
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lockFileName := uniqueID + ".lock"
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_, err := createLockFile(lockFilePath + "/" + lockFileName)
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// if lockFile exist – send notification to second instance
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if err != nil {
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c := NewCalloc()
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defer c.Free()
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singleInstanceUniqueId := c.String(uniqueID)
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data, err := options.NewSecondInstanceData()
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if err != nil {
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return
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}
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serialized, err := json.Marshal(data)
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if err != nil {
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return
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}
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C.SendDataToFirstInstance(singleInstanceUniqueId, c.String(string(serialized)))
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os.Exit(0)
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}
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}
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//export HandleSecondInstanceData
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func HandleSecondInstanceData(secondInstanceMessage *C.char) {
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message := C.GoString(secondInstanceMessage)
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var secondInstanceData options.SecondInstanceData
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err := json.Unmarshal([]byte(message), &secondInstanceData)
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if err == nil {
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secondInstanceBuffer <- secondInstanceData
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}
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}
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// CreateLockFile tries to create a file with given name and acquire an
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// exclusive lock on it. If the file already exists AND is still locked, it will
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// fail.
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func createLockFile(filename string) (*os.File, error) {
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file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE, 0600)
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if err != nil {
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fmt.Printf("Failed to open lockfile %s: %s", filename, err)
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return nil, err
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}
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err = syscall.Flock(int(file.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
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if err != nil {
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// Flock failed for some other reason than other instance already lock it. Print it in logs for possible debugging.
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if !strings.Contains(err.Error(), "resource temporarily unavailable") {
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fmt.Printf("Failed to lock lockfile %s: %s", filename, err)
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}
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file.Close()
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return nil, err
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}
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return file, nil
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}
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// If app is sandboxed, golang os.TempDir() will return path that will not be accessible. So use native macOS temp dir function.
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func getTempDir() string {
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cstring := C.GetMacOsNativeTempDir()
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path := C.GoString(cstring)
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C.free(unsafe.Pointer(cstring))
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return path
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}
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