fix(ios): wrap the async functions at the entry point

Author: Donald

ios/DeviceUpgrade.swift

@@ -35,40 +35,38 @@ class DeviceUpgrade {
     }
 
     func startUpgrade(resolver resolve: @escaping RCTPromiseResolveBlock, rejecter reject: @escaping RCTPromiseRejectBlock) {
-        DispatchQueue.main.async {
-            self.upgradeResolver = resolve
-            self.upgradeRejecter = reject
-
-            guard let bleUuid = UUID(uuidString: self.bleId) else {
-                let error = NSError(domain: "", code: 200, userInfo: nil)
-                return reject("error", "failed to parse uuid", error);
-            }
-
-            guard let fileUrl = URL(string: self.fileURI) else {
-                let error = NSError(domain: "", code: 200, userInfo: nil)
-                return reject("error", "failed to parse file uri as url", error);
-            }
-
-            do {
-                let filehandle = try FileHandle(forReadingFrom: fileUrl)
-                let file = Data(filehandle.availableData)
-                filehandle.closeFile()
-
-                self.bleTransport = McuMgrBleTransport(bleUuid)
-                self.dfuManager = FirmwareUpgradeManager(transporter: self.bleTransport!, delegate: self)
-
-                let estimatedSwapTime: TimeInterval = self.options["estimatedSwapTime"] as! TimeInterval
-                let config = FirmwareUpgradeConfiguration(
-                    estimatedSwapTime: estimatedSwapTime
-                )
-
-                self.dfuManager!.logDelegate = self.logDelegate
-                self.dfuManager!.mode = self.getMode();
-
-                try self.dfuManager!.start(data: file as Data, using: config)
-            } catch {
-                reject(error.localizedDescription, error.localizedDescription, error)
-            }
+        self.upgradeResolver = resolve
+        self.upgradeRejecter = reject
+
+        guard let bleUuid = UUID(uuidString: self.bleId) else {
+            let error = NSError(domain: "", code: 200, userInfo: nil)
+            return reject("error", "failed to parse uuid", error);
+        }
+
+        guard let fileUrl = URL(string: self.fileURI) else {
+            let error = NSError(domain: "", code: 200, userInfo: nil)
+            return reject("error", "failed to parse file uri as url", error);
+        }
+
+        do {
+            let filehandle = try FileHandle(forReadingFrom: fileUrl)
+            let file = Data(filehandle.availableData)
+            filehandle.closeFile()
+
+            self.bleTransport = McuMgrBleTransport(bleUuid)
+            self.dfuManager = FirmwareUpgradeManager(transporter: self.bleTransport!, delegate: self)
+
+            let estimatedSwapTime: TimeInterval = self.options["estimatedSwapTime"] as! TimeInterval
+            let config = FirmwareUpgradeConfiguration(
+                estimatedSwapTime: estimatedSwapTime
+            )
+
+            self.dfuManager!.logDelegate = self.logDelegate
+            self.dfuManager!.mode = self.getMode();
+
+            try self.dfuManager!.start(data: file as Data, using: config)
+        } catch {
+            reject(error.localizedDescription, error.localizedDescription, error)
         }
     }
 

ios/McuManager.swift

@@ -22,24 +22,26 @@ class RNMcuManager: RCTEventEmitter {
 
     @objc
     func eraseImage(_ bleId: String, resolver resolve: @escaping RCTPromiseResolveBlock, rejecter reject: @escaping RCTPromiseRejectBlock) -> Void {
-        guard let bleUuid = UUID(uuidString: bleId) else {
-            let error = NSError(domain: "", code: 200, userInfo: nil)
-            return reject("error", "failed to parse uuid", error);
-        }
+        DispatchQueue.main.async {
+            guard let bleUuid = UUID(uuidString: bleId) else {
+                let error = NSError(domain: "", code: 200, userInfo: nil)
+                return reject("error", "failed to parse uuid", error);
+            }
+
+            let bleTransport = McuMgrBleTransport(bleUuid)
+            let imageManager = ImageManager(transporter: bleTransport)
 
-        let bleTransport = McuMgrBleTransport(bleUuid)
-        let imageManager = ImageManager(transporter: bleTransport)
+            imageManager.erase { (response: McuMgrResponse?, err: Error?) in
+                bleTransport.close()
 
-        imageManager.erase { (response: McuMgrResponse?, err: Error?) in
-            bleTransport.close()
+                if (err != nil) {
+                    reject("ERASE_ERR", err?.localizedDescription, err)
+                    return
+                }
 
-            if (err != nil) {
-                reject("ERASE_ERR", err?.localizedDescription, err)
+                resolve(nil)
                 return
             }
-
-            resolve(nil)
-            return
         }
     }
 
@@ -50,12 +52,14 @@ class RNMcuManager: RCTEventEmitter {
 
     @objc
     func runUpgrade(_ id: String, resolver resolve: @escaping RCTPromiseResolveBlock, rejecter reject: @escaping RCTPromiseRejectBlock) -> Void {
-        guard let upgrade = self.upgrades[id] else {
-            reject("ID_NOT_FOUND", "Upgrade object not found", nil)
-            return
-        }
+        DispatchQueue.main.async {
+            guard let upgrade = self.upgrades[id] else {
+                reject("ID_NOT_FOUND", "Upgrade object not found", nil)
+                return
+            }
 
-        upgrade.startUpgrade(resolver: resolve, rejecter: reject)
+            upgrade.startUpgrade(resolver: resolve, rejecter: reject)
+        }
     }
 
     @objc