feat: move native communication to FFI (#1457)

bind/desktop/main.go

@@ -1,8 +1,21 @@
 package main
 
+/*
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef void (*TaskEventCallback)(char* payload);
+
+static void callTaskEventCallback(uintptr_t callback, char* payload) {
+	((TaskEventCallback)callback)(payload);
+}
+*/
 import "C"
 import (
 	"encoding/json"
+	"fmt"
+	"unsafe"
+
 	"github.com/GopeedLab/gopeed/pkg/rest"
 	"github.com/GopeedLab/gopeed/pkg/rest/model"
 )
@@ -16,6 +29,7 @@ func Start(cfg *C.char) (int, *C.char) {
 		return 0, C.CString(err.Error())
 	}
 	config.ProductionMode = true
+	config.NativeMode = true
 	applyWebViewProvider(&config)
 	realPort, err := rest.Start(&config)
 	if err != nil {
@@ -28,3 +42,65 @@ func Start(cfg *C.char) (int, *C.char) {
 func Stop() {
 	rest.Stop()
 }
+
+//export GetAPIServerState
+func GetAPIServerState() *C.char {
+	return C.CString(apiServerResult(rest.GetAPIServerState()))
+}
+
+//export StartAPIServer
+func StartAPIServer() *C.char {
+	return C.CString(apiServerResult(rest.StartAPIServer()))
+}
+
+//export StopAPIServer
+func StopAPIServer() *C.char {
+	return C.CString(apiServerResult(rest.StopAPIServer()))
+}
+
+//export RestartAPIServer
+func RestartAPIServer() *C.char {
+	return C.CString(apiServerResult(rest.RestartAPIServer()))
+}
+
+func apiServerResult(state *model.APIServerState, err error) string {
+	result := &model.APIServerOperationResult{State: state}
+	if err != nil {
+		result.Error = err.Error()
+	}
+	data, marshalErr := json.Marshal(result)
+	if marshalErr != nil {
+		return fmt.Sprintf(`{"state":null,"error":%q}`, marshalErr.Error())
+	}
+	return string(data)
+}
+
+//export Invoke
+func Invoke(method *C.char, path *C.char, query *C.char, body *C.char) *C.char {
+	return C.CString(rest.Invoke(
+		C.GoString(method),
+		C.GoString(path),
+		C.GoString(query),
+		C.GoString(body),
+	))
+}
+
+//export SubscribeTaskEvents
+func SubscribeTaskEvents(mask C.ulonglong, callback C.uintptr_t) {
+	if mask == 0 || callback == 0 {
+		rest.SubscribeTaskEvents(0, nil)
+		return
+	}
+	rest.SubscribeTaskEvents(uint64(mask), func(payload string) {
+		// Ownership crosses the asynchronous Dart callback boundary. Dart frees
+		// this string with FreeCString after decoding it.
+		C.callTaskEventCallback(callback, C.CString(payload))
+	})
+}
+
+//export FreeCString
+func FreeCString(value *C.char) {
+	if value != nil {
+		C.free(unsafe.Pointer(value))
+	}
+}

bind/mobile/main.go

@@ -4,6 +4,7 @@ package libgopeed
 import "C"
 import (
 	"encoding/json"
+
 	"github.com/GopeedLab/gopeed/internal/webview/rpcprovider"
 	"github.com/GopeedLab/gopeed/pkg/rest"
 	"github.com/GopeedLab/gopeed/pkg/rest/model"
@@ -15,6 +16,7 @@ func Start(cfg string) (int, error) {
 		return 0, err
 	}
 	config.ProductionMode = true
+	config.NativeMode = true
 	applyWebViewProvider(&config)
 	return rest.Start(&config)
 }
@@ -23,6 +25,47 @@ func Stop() {
 	rest.Stop()
 }
 
+func GetAPIServerState() string {
+	return apiServerResult(rest.GetAPIServerState())
+}
+
+func StartAPIServer() string {
+	return apiServerResult(rest.StartAPIServer())
+}
+
+func StopAPIServer() string {
+	return apiServerResult(rest.StopAPIServer())
+}
+
+func RestartAPIServer() string {
+	return apiServerResult(rest.RestartAPIServer())
+}
+
+func apiServerResult(state *model.APIServerState, err error) string {
+	result := &model.APIServerOperationResult{State: state}
+	if err != nil {
+		result.Error = err.Error()
+	}
+	data, _ := json.Marshal(result)
+	return string(data)
+}
+
+func Invoke(method, path, query, body string) string {
+	return rest.Invoke(method, path, query, body)
+}
+
+type TaskEventListener interface {
+	OnTaskEvent(payload string)
+}
+
+func SubscribeTaskEvents(mask int64, listener TaskEventListener) {
+	if mask == 0 || listener == nil {
+		rest.SubscribeTaskEvents(0, nil)
+		return
+	}
+	rest.SubscribeTaskEvents(uint64(mask), listener.OnTaskEvent)
+}
+
 func applyWebViewProvider(config *model.StartConfig) {
 	if config == nil || config.WebViewRPCConfig == nil || !config.WebViewRPCConfig.Enabled() {
 		return