feat(iOS): screensharing extension swift implementation

ios/app/app.xcodeproj/project.pbxproj

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@@ -54,11 +55,11 @@
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 			remoteInfo = JitsiMeetCompanion;
 		};
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 			containerPortal = 83CBB9F71A601CBA00E9B192 /* Project object */;
 			proxyType = 1;
-			remoteGlobalIDString = 4EC49BB525BEDAC100E76218;
+			remoteGlobalIDString = 4EB06022260E026600F524C5;
 			remoteInfo = "JitsiMeetBroadcast Extension";
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 /* End PBXContainerItemProxy section */
@@ -104,7 +105,7 @@
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-				4EC49BBF25BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex in Embed App Extensions */,
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 			name = "Embed App Extensions";
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@@ -139,19 +140,18 @@
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@@ -189,11 +189,11 @@
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@@ -261,23 +261,22 @@
 			path = src;
 			sourceTree = "<group>";
 		};
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-				4EC49BCA25BEDB6400E76218 /* SocketConnection.m */,
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-				4EC49BD025BF19CF00E76218 /* SampleUploader.m */,
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-				4E51B75C25E4115F0038575A /* DarwinNotificationCenter.h */,
-				4E51B75D25E4115F0038575A /* DarwinNotificationCenter.m */,
-			);
+				4EB06032260E08CC00F524C5 /* extension.entitlements */,
+				4EB06026260E026600F524C5 /* SampleHandler.swift */,
+				4EB0603B260E09D000F524C5 /* SampleUploader.swift */,
+				4EB06039260E09D000F524C5 /* SocketConnection.swift */,
+				4EB0603A260E09D000F524C5 /* DarwinNotificationCenter.swift */,
+				4E90F93F2632D1AB001102D4 /* Atomic.swift */,
+				4EB06028260E026600F524C5 /* Info.plist */,
+			);
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 			name = "JitsiMeetBroadcast Extension";
 			path = "broadcast-extension";
 			sourceTree = "<group>";
+			tabWidth = 4;
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@@ -286,6 +285,8 @@
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 				FC040BBED70876444D89E91C /* Pods-JitsiMeet.release.xcconfig */,
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+				5FEF9D87A4D2A38AD7193308 /* Pods-JitsiMeet-JitsiMeetBroadcastExtension.release.xcconfig */,
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 			name = Pods;
 			sourceTree = "<group>";
@@ -299,8 +300,8 @@
 				13B07FAE1A68108700A75B9A /* src */,
 				5E96ADD5E49F3B3822EF9A52 /* Pods */,
 				0BEA5C261F7B8F73000D0AB4 /* Watch app */,
-				4EC49BB825BEDAC100E76218 /* JitsiMeetBroadcast Extension */,
 				0BEA5C351F7B8F73000D0AB4 /* WatchKit extension */,
+				4EB06025260E026600F524C5 /* JitsiMeetBroadcast Extension */,
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@@ -312,7 +313,7 @@
 				13B07F961A680F5B00A75B9A /* jitsi-meet.app */,
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 				0BEA5C311F7B8F73000D0AB4 /* JitsiMeetCompanion Extension.appex */,
-				4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */,
+				4EB06023260E026600F524C5 /* JitsiMeetBroadcastExtension.appex */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -376,28 +377,28 @@
 			);
 			dependencies = (
 				0BEA5C401F7B8F73000D0AB4 /* PBXTargetDependency */,
-				4EC49BBE25BEDAC100E76218 /* PBXTargetDependency */,
+				4EB0602A260E026600F524C5 /* PBXTargetDependency */,
 			);
 			name = JitsiMeet;
 			productName = "Jitsi Meet";
 			productReference = 13B07F961A680F5B00A75B9A /* jitsi-meet.app */;
 			productType = "com.apple.product-type.application";
 		};
-		4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */ = {
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 			isa = PBXNativeTarget;
-			buildConfigurationList = 4EC49BC025BEDAC100E76218 /* Build configuration list for PBXNativeTarget "JitsiMeetBroadcast Extension" */;
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-				4EC49BB225BEDAC100E76218 /* Sources */,
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 			);
 			buildRules = (
 			);
 			dependencies = (
 			);
-			name = "JitsiMeetBroadcast Extension";
+			name = JitsiMeetBroadcastExtension;
 			productName = "JitsiMeetBroadcast Extension";
-			productReference = 4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */;
+			productReference = 4EB06023260E026600F524C5 /* JitsiMeetBroadcastExtension.appex */;
 			productType = "com.apple.product-type.app-extension";
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 /* End PBXNativeTarget section */
@@ -406,6 +407,7 @@
 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
+				LastSwiftUpdateCheck = 1240;
 				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = Facebook;
 				TargetAttributes = {
@@ -429,8 +431,8 @@
 							};
 						};
 					};
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 				};
 			};
@@ -450,7 +452,7 @@
 				13B07F861A680F5B00A75B9A /* JitsiMeet */,
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 				0BEA5C301F7B8F73000D0AB4 /* JitsiMeetCompanion Extension */,
-				4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */,
+				4EB06022260E026600F524C5 /* JitsiMeetBroadcastExtension */,
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 		};
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@@ -483,7 +485,7 @@
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@@ -625,14 +627,15 @@
 			);
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-				4EC49BBB25BEDAC100E76218 /* SampleHandler.m in Sources */,
-				4E51B75E25E4115F0038575A /* DarwinNotificationCenter.m in Sources */,
-				4EC49BD125BF19CF00E76218 /* SampleUploader.m in Sources */,
+				4EB0603C260E09D000F524C5 /* SocketConnection.swift in Sources */,
+				4EB0603E260E09D000F524C5 /* SampleUploader.swift in Sources */,
+				4EB0603D260E09D000F524C5 /* DarwinNotificationCenter.swift in Sources */,
+				4EB06027260E026600F524C5 /* SampleHandler.swift in Sources */,
+				4E90F9402632D1AB001102D4 /* Atomic.swift in Sources */,
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 			runOnlyForDeploymentPostprocessing = 0;
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@@ -649,10 +652,10 @@
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 		};
-		4EC49BBE25BEDAC100E76218 /* PBXTargetDependency */ = {
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-			target = 4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */;
-			targetProxy = 4EC49BBD25BEDAC100E76218 /* PBXContainerItemProxy */;
+			target = 4EB06022260E026600F524C5 /* JitsiMeetBroadcastExtension */;
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@@ -879,7 +882,7 @@
 			};
 			name = Release;
 		};
-		4EC49BC125BEDAC100E76218 /* Debug */ = {
+		4EB0602D260E026700F524C5 /* Debug */ = {
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@@ -890,13 +893,13 @@
 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_ENTITLEMENTS = "broadcast-extension/extension.entitlements";
-				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEVELOPMENT_TEAM = FC967L3QRG;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "broadcast-extension/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
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@@ -907,11 +910,14 @@
 				PRODUCT_BUNDLE_IDENTIFIER = org.jitsi.meet.broadcast.extension;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
-		4EC49BC225BEDAC100E76218 /* Release */ = {
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@@ -922,14 +928,14 @@
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 				CODE_SIGN_ENTITLEMENTS = "broadcast-extension/extension.entitlements";
-				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_IDENTITY = "Apple Development";
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 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
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 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "broadcast-extension/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 14.4;
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@@ -939,6 +945,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = org.jitsi.meet.broadcast.extension;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -1087,11 +1095,11 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		4EC49BC025BEDAC100E76218 /* Build configuration list for PBXNativeTarget "JitsiMeetBroadcast Extension" */ = {
+		4EB0602C260E026700F524C5 /* Build configuration list for PBXNativeTarget "JitsiMeetBroadcastExtension" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				4EC49BC125BEDAC100E76218 /* Debug */,
-				4EC49BC225BEDAC100E76218 /* Release */,
+				4EB0602D260E026700F524C5 /* Debug */,
+				4EB0602E260E026700F524C5 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;

ios/app/broadcast-extension/Atomic.swift

@@ -0,0 +1,30 @@
+
+import Foundation
+
+@propertyWrapper
+struct Atomic<Value> {
+
+    private var value: Value
+    private let lock = NSLock()
+
+    init(wrappedValue value: Value) {
+        self.value = value
+    }
+
+    var wrappedValue: Value {
+      get { return load() }
+      set { store(newValue: newValue) }
+    }
+
+    func load() -> Value {
+        lock.lock()
+        defer { lock.unlock() }
+        return value
+    }
+
+    mutating func store(newValue: Value) {
+        lock.lock()
+        defer { lock.unlock() }
+        value = newValue
+    }
+}

ios/app/broadcast-extension/DarwinNotificationCenter.h

@@ -1,31 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-extern NSNotificationName const kBroadcastStartedNotification;
-extern NSNotificationName const kBroadcastStoppedNotification;
-
-@interface DarwinNotificationCenter: NSObject
-
-+ (instancetype)sharedInstance;
-- (void)postNotificationWithName:(NSNotificationName)name;
-
-@end
-
-NS_ASSUME_NONNULL_END

ios/app/broadcast-extension/DarwinNotificationCenter.m

@@ -1,50 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import "DarwinNotificationCenter.h"
-
-NSNotificationName const kBroadcastStartedNotification = @"iOS_BroadcastStarted";
-NSNotificationName const kBroadcastStoppedNotification = @"iOS_BroadcastStopped";
-
-@implementation DarwinNotificationCenter {
-  CFNotificationCenterRef _notificationCenter;
-}
-
-+ (instancetype)sharedInstance {
-  static DarwinNotificationCenter *sharedInstance = nil;
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-      sharedInstance = [[self alloc] init];
-  });
-  
-  return sharedInstance;
-}
-
-- (instancetype)init {
-  self = [super init];
-  if (self) {
-    _notificationCenter = CFNotificationCenterGetDarwinNotifyCenter();
-  }
-  
-  return self;
-}
-
-- (void)postNotificationWithName:(NSString*)name {
-  CFNotificationCenterPostNotification(_notificationCenter, (__bridge CFStringRef)name, NULL, NULL, true);
-}
-
-@end
-

ios/app/broadcast-extension/DarwinNotificationCenter.swift

@@ -0,0 +1,37 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import Foundation
+
+enum DarwinNotification: String {
+    case broadcastStarted = "iOS_BroadcastStarted"
+    case broadcastStopped = "iOS_BroadcastStopped"
+}
+
+class DarwinNotificationCenter {
+    
+    static var shared = DarwinNotificationCenter()
+    
+    private var notificationCenter: CFNotificationCenter
+    
+    init() {
+        notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
+    }
+    
+    func postNotification(_ name: DarwinNotification) {
+        CFNotificationCenterPostNotification(notificationCenter, CFNotificationName(rawValue: name.rawValue as CFString), nil, nil, true)
+    }
+}

ios/app/broadcast-extension/Info.plist

@@ -5,7 +5,7 @@
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>
-	<string>JitsiMeet Broadcast Extension</string>
+	<string>Jitsi Meet Broadcast Extension</string>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
@@ -25,7 +25,7 @@
 		<key>NSExtensionPointIdentifier</key>
 		<string>com.apple.broadcast-services-upload</string>
 		<key>NSExtensionPrincipalClass</key>
-		<string>SampleHandler</string>
+		<string>$(PRODUCT_MODULE_NAME).SampleHandler</string>
 		<key>RPBroadcastProcessMode</key>
 		<string>RPBroadcastProcessModeSampleBuffer</string>
 	</dict>

ios/app/broadcast-extension/SampleHandler.h

@@ -1,21 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import <ReplayKit/ReplayKit.h>
-
-@interface SampleHandler : RPBroadcastSampleHandler
-
-@end

ios/app/broadcast-extension/SampleHandler.m

@@ -1,123 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import "SampleHandler.h"
-#import "SocketConnection.h"
-#import "SampleUploader.h"
-#import "DarwinNotificationCenter.h"
-
-@interface SampleHandler ()
-
-@property (nonatomic, retain) SocketConnection *clientConnection;
-@property (nonatomic, retain) SampleUploader *uploader;
-
-@end
-
-@implementation SampleHandler
-
-- (instancetype)init {
-  self = [super init];
-  if (self) {
-    self.clientConnection = [[SocketConnection alloc] initWithFilePath:self.socketFilePath];
-    [self setupConnection];
-    
-    self.uploader = [[SampleUploader alloc] initWithConnection:self.clientConnection];    
-  }
-  
-  return self;
-}
-
-- (void)broadcastStartedWithSetupInfo:(NSDictionary<NSString *,NSObject *> *)setupInfo {
-  // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
-  NSLog(@"broadcast started");
-  
-  [[DarwinNotificationCenter sharedInstance] postNotificationWithName:kBroadcastStartedNotification];
-  [self openConnection];
-}
-
-- (void)broadcastPaused {
-    // User has requested to pause the broadcast. Samples will stop being delivered.
-}
-
-- (void)broadcastResumed {
-    // User has requested to resume the broadcast. Samples delivery will resume.
-}
-
-- (void)broadcastFinished {
-    // User has requested to finish the broadcast.
-  [[DarwinNotificationCenter sharedInstance] postNotificationWithName:kBroadcastStoppedNotification];
-  [self.clientConnection close];
-}
-
-- (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType {
-  static NSUInteger frameCount = 0;
-  switch (sampleBufferType) {
-    case RPSampleBufferTypeVideo:
-      // adjust frame rate by using every third frame
-      if (++frameCount%3 == 0 && self.uploader.isReady) {
-        [self.uploader sendSample:sampleBuffer];
-      }
-      break;
-
-    default:
-      break;
-  }
-}
-
-// MARK: Private Methods
-
-- (NSString *)socketFilePath {
-    // the appGroupIdentifier must match the value provided in the app's info.plist for the RTCAppGroupIdentifier key
-    NSString *appGroupIdentifier = @"group.org.jitsi.meet.appgroup";
-    NSURL *sharedContainer = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:appGroupIdentifier];
-    NSString *socketFilePath = [[sharedContainer URLByAppendingPathComponent:@"rtc_SSFD"] path];
-      
-    return socketFilePath;
-}
-
-- (void)setupConnection {
-  __weak __typeof(self) weakSelf = self;
-  self.clientConnection.didClose = ^(NSError *error) {
-    NSLog(@"client connection did close: %@", error);
-    if (error) {
-      [weakSelf finishBroadcastWithError:error];
-    }
-    else {
-      NSInteger JMScreenSharingStopped = 10001;
-      NSError *customError = [NSError errorWithDomain:RPRecordingErrorDomain
-                                                 code:JMScreenSharingStopped
-                                             userInfo:@{NSLocalizedDescriptionKey: @"Screen sharing stopped"}];
-      [weakSelf finishBroadcastWithError:customError];
-    }
-  };
-}
-
-- (void)openConnection {
-  dispatch_queue_t queue = dispatch_queue_create("org.jitsi.meet.broadcast.connectTimer", 0);
-  dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
-  dispatch_source_set_timer(timer, dispatch_walltime(NULL, 0), 0.1 * NSEC_PER_SEC, 0.1 * NSEC_PER_SEC);
-  
-  dispatch_source_set_event_handler(timer, ^{
-    BOOL success = [self.clientConnection open];
-    if (success) {
-      dispatch_source_cancel(timer);
-    }
-  });
-
-  dispatch_resume(timer);
-}
-
-@end

ios/app/broadcast-extension/SampleHandler.swift

@@ -0,0 +1,117 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import ReplayKit
+import JitsiMeetSDK
+
+private enum Constants {
+    // the App Group ID value that the app and the broadcast extension targets are setup with. It differs for each app.
+    static let appGroupIdentifier = "group.org.jitsi.meet.appgroup"
+}
+
+class SampleHandler: RPBroadcastSampleHandler {
+    
+    private var clientConnection: SocketConnection?
+    private var uploader: SampleUploader?
+    
+    private var frameCount: Int = 0
+    
+    var socketFilePath: String {
+      let sharedContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: Constants.appGroupIdentifier)
+        
+        return sharedContainer?.appendingPathComponent("rtc_SSFD").path ?? ""
+    }
+    
+    override init() {
+      super.init()
+        if let connection = SocketConnection(filePath: socketFilePath) {
+          clientConnection = connection
+          setupConnection()
+          
+          uploader = SampleUploader(connection: connection)
+        }
+    }
+
+    override func broadcastStarted(withSetupInfo setupInfo: [String: NSObject]?) {
+        // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
+        print("broadcast started")
+        
+        frameCount = 0
+        
+        DarwinNotificationCenter.shared.postNotification(.broadcastStarted)
+        openConnection()
+    }
+    
+    override func broadcastPaused() {
+        // User has requested to pause the broadcast. Samples will stop being delivered.
+    }
+    
+    override func broadcastResumed() {
+        // User has requested to resume the broadcast. Samples delivery will resume.
+    }
+    
+    override func broadcastFinished() {
+        // User has requested to finish the broadcast.
+        DarwinNotificationCenter.shared.postNotification(.broadcastStopped)
+        clientConnection?.close()
+    }
+    
+    override func processSampleBuffer(_ sampleBuffer: CMSampleBuffer, with sampleBufferType: RPSampleBufferType) {
+        switch sampleBufferType {
+        case RPSampleBufferType.video:
+            // very simple mechanism for adjusting frame rate by using every third frame
+            frameCount += 1
+            if frameCount % 3 == 0 {
+                uploader?.send(sample: sampleBuffer)
+            }
+        default:
+            break
+        }
+    }
+}
+
+private extension SampleHandler {
+  
+    func setupConnection() {
+        clientConnection?.didClose = { [weak self] error in
+            print("client connection did close \(String(describing: error))")
+          
+            if let error = error {
+                self?.finishBroadcastWithError(error)
+            } else {
+                // the displayed failure message is more user friendly when using NSError instead of Error
+                let JMScreenSharingStopped = 10001
+                let customError = NSError(domain: RPRecordingErrorDomain, code: JMScreenSharingStopped, userInfo: [NSLocalizedDescriptionKey: "Screen sharing stopped"])
+                self?.finishBroadcastWithError(customError)
+            }
+        }
+    }
+    
+    func openConnection() {
+        let queue = DispatchQueue(label: "broadcast.connectTimer")
+        let timer = DispatchSource.makeTimerSource(queue: queue)
+        timer.schedule(deadline: .now(), repeating: .milliseconds(100), leeway: .milliseconds(500))
+        timer.setEventHandler { [weak self] in
+            guard self?.clientConnection?.open() == true else {
+                return
+            }
+            
+            timer.cancel()
+        }
+        
+        timer.resume()
+    }
+}

ios/app/broadcast-extension/SampleUploader.h

@@ -1,33 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import <Foundation/Foundation.h>
-#import <ReplayKit/ReplayKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@class SocketConnection;
-
-@interface SampleUploader : NSObject
-
-@property (nonatomic, assign, readonly) BOOL isReady;
-
-- (instancetype)initWithConnection:(SocketConnection *)connection;
-- (void)sendSample:(CMSampleBufferRef)sampleBuffer;
-
-@end
-
-NS_ASSUME_NONNULL_END

ios/app/broadcast-extension/SampleUploader.m

@@ -1,157 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import <MessageUI/MessageUI.h>
-#import <ReplayKit/ReplayKit.h>
-
-#import "SampleUploader.h"
-#import "SocketConnection.h"
-
-static const NSInteger kBufferMaxLenght = 10 * 1024;
-
-@interface SampleUploader ()
-
-@property (nonatomic, assign) BOOL isReady;
-
-@property (nonatomic, strong) dispatch_queue_t serialQueue;
-@property (nonatomic, strong) SocketConnection *connection;
-@property (nonatomic, strong) CIContext *imageContext;
-
-@property (nonatomic, strong) NSData *dataToSend;
-@property (nonatomic, assign) NSUInteger byteIndex;
-
-@end
-
-@implementation SampleUploader
-
-- (instancetype)initWithConnection:(SocketConnection *)connection {
-  self = [super init];
-  if (self) {
-    self.serialQueue = dispatch_queue_create("org.jitsi.meet.broadcast.sampleUploader", DISPATCH_QUEUE_SERIAL);
-    
-    self.connection = connection;
-    [self setupConnection];
-    
-    self.imageContext = [[CIContext alloc] initWithOptions:nil];
-    self.isReady = false;
-  }
-  
-  return self;
-}
-
-- (void)sendSample:(CMSampleBufferRef)sampleBuffer {
-  self.isReady = false;
-  
-  self.dataToSend = [self prepareSample:sampleBuffer];
-  self.byteIndex = 0;
-  
-  dispatch_async(self.serialQueue, ^{
-    [self sendData];
-  });
-}
-
-// MARK: Private Methods
-
-- (void)setupConnection {
-  __weak __typeof(self) weakSelf = self;
-  self.connection.didOpen = ^{
-    weakSelf.isReady = true;
-  };
-  self.connection.streamHasSpaceAvailable = ^{
-    dispatch_async(weakSelf.serialQueue, ^{
-      weakSelf.isReady = ![weakSelf sendData];
-    });
-  };
-}
-
-/**
- This function downscales and converts to jpeg the provided sample buffer, then wraps the resulted image data into a CFHTTPMessageRef. Returns the serialized CFHTTPMessageRef.
- */
-- (NSData *)prepareSample:(CMSampleBufferRef)sampleBuffer {
-  CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
-    
-  CVPixelBufferLockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
-  
-  CGFloat scaleFactor = 2;
-  size_t width = CVPixelBufferGetWidth(imageBuffer)/scaleFactor;
-  size_t height = CVPixelBufferGetHeight(imageBuffer)/scaleFactor;
-  CGImagePropertyOrientation orientation = ((__bridge NSNumber*)CMGetAttachment(sampleBuffer, (__bridge CFStringRef)RPVideoSampleOrientationKey , NULL)).unsignedIntValue;
-    
-  CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1/scaleFactor, 1/scaleFactor);
-  NSData *bufferData = [self jpegDataFromPixelBuffer:imageBuffer withScaling:scaleTransform];
-  
-  CVPixelBufferUnlockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
-  
-  if (bufferData) {
-    CFHTTPMessageRef httpResponse = CFHTTPMessageCreateResponse(kCFAllocatorDefault, 200, NULL, kCFHTTPVersion1_1);
-    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Content-Length", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", bufferData.length]);
-    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Buffer-Width", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", width]);
-    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Buffer-Height", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", height]);
-    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Buffer-Orientation", (__bridge CFStringRef)[NSString stringWithFormat:@"%u", orientation]);
-
-    CFHTTPMessageSetBody(httpResponse, (__bridge CFDataRef)bufferData);
-
-    CFDataRef serializedMessage = CFHTTPMessageCopySerializedMessage(httpResponse);
-    CFRelease(httpResponse);
-    
-    return CFBridgingRelease(serializedMessage);
-  }
-  
-  return nil;
-}
-
-- (BOOL)sendData {
-  if (!self.dataToSend) {
-    NSLog(@"no data to send");
-    return false;
-  }
-
-  NSUInteger bytesLeft = self.dataToSend.length - self.byteIndex;
-  
-  NSInteger length = bytesLeft > kBufferMaxLenght ? kBufferMaxLenght : bytesLeft;
-  uint8_t buffer[length];
-  [self.dataToSend getBytes:&buffer range:NSMakeRange(self.byteIndex, length)];
-
-  length = [self.connection writeBufferToStream:buffer maxLength:length];
-  if (length > 0) {
-    self.byteIndex += length;
-    bytesLeft -= length;
-
-    if (bytesLeft == 0) {
-      NSLog(@"video sample processed successfully");
-      self.dataToSend = nil;
-      self.byteIndex = 0;
-    }
-  }
-  else {
-    NSLog(@"writeBufferToStream failure");
-  }
-  
-  return true;
-}
-
-- (NSData *)jpegDataFromPixelBuffer:(CVPixelBufferRef)pixelBuffer withScaling:(CGAffineTransform)scaleTransform {
-  CIImage *image = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
-  image = [image imageByApplyingTransform:scaleTransform];
-  
-  NSDictionary *options = @{(NSString *)kCGImageDestinationLossyCompressionQuality: [NSNumber numberWithFloat:1.0]};
-  NSData *imageData = [self.imageContext JPEGRepresentationOfImage:image
-                                                        colorSpace:image.colorSpace
-                                                           options:options];
-  return imageData;
-}
-
-@end

ios/app/broadcast-extension/SampleUploader.swift

@@ -0,0 +1,154 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import Foundation
+import ReplayKit
+
+private enum Constants {
+    static let bufferMaxLength = 10240
+}
+
+class SampleUploader {
+    
+    private static var imageContext = CIContext(options: nil)
+    
+    @Atomic private var isReady: Bool = false
+    private var connection: SocketConnection
+  
+    private var dataToSend: Data?
+    private var byteIndex = 0
+  
+    private let serialQueue: DispatchQueue
+    
+    init(connection: SocketConnection) {
+        self.connection = connection
+        self.serialQueue = DispatchQueue(label: "org.jitsi.meet.broadcast.sampleUploader")
+      
+        setupConnection()
+    }
+  
+    @discardableResult func send(sample buffer: CMSampleBuffer) -> Bool {
+        guard isReady == true else {
+            return false
+        }
+        
+        isReady = false
+
+        dataToSend = prepare(sample: buffer)
+        byteIndex = 0
+
+        serialQueue.async { [weak self] in
+            self?.sendDataChunk()
+        }
+        
+        return true
+    }
+}
+
+private extension SampleUploader {
+    
+    func setupConnection() {
+        connection.didOpen = { [weak self] in
+            self?.isReady = true
+        }
+        connection.streamHasSpaceAvailable = { [weak self] in
+            self?.serialQueue.async {
+                self?.isReady = !(self?.sendDataChunk() ?? true)
+            }
+        }
+    }
+    
+    @discardableResult func sendDataChunk() -> Bool {
+        guard let dataToSend = dataToSend else {
+            return false
+        }
+      
+        var bytesLeft = dataToSend.count - byteIndex
+        var length = bytesLeft > Constants.bufferMaxLength ? Constants.bufferMaxLength : bytesLeft
+
+        length = dataToSend[byteIndex..<(byteIndex + length)].withUnsafeBytes {
+            guard let ptr = $0.bindMemory(to: UInt8.self).baseAddress else {
+                return 0
+            }
+          
+            return connection.writeToStream(buffer: ptr, maxLength: length)
+        }
+
+        if length > 0 {
+            byteIndex += length
+            bytesLeft -= length
+
+            if bytesLeft == 0 {
+                self.dataToSend = nil
+                byteIndex = 0
+            }
+        } else {
+            print("writeBufferToStream failure")
+        }
+      
+        return true
+    }
+    
+    func prepare(sample buffer: CMSampleBuffer) -> Data? {
+        guard let imageBuffer = CMSampleBufferGetImageBuffer(buffer) else {
+            print("image buffer not available")
+            return nil
+        }
+        
+        CVPixelBufferLockBaseAddress(imageBuffer, .readOnly)
+        
+        let scaleFactor = 2.0
+        let width = CVPixelBufferGetWidth(imageBuffer)/Int(scaleFactor)
+        let height = CVPixelBufferGetHeight(imageBuffer)/Int(scaleFactor)
+        let orientation = CMGetAttachment(buffer, key: RPVideoSampleOrientationKey as CFString, attachmentModeOut: nil)?.uintValue ?? 0
+                                    
+        let scaleTransform = CGAffineTransform(scaleX: CGFloat(1.0/scaleFactor), y: CGFloat(1.0/scaleFactor))
+        let bufferData = self.jpegData(from: imageBuffer, scale: scaleTransform)
+        
+        CVPixelBufferUnlockBaseAddress(imageBuffer, .readOnly)
+        
+        guard let messageData = bufferData else {
+            print("corrupted image buffer")
+            return nil
+        }
+              
+        let httpResponse = CFHTTPMessageCreateResponse(nil, 200, nil, kCFHTTPVersion1_1).takeRetainedValue()
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Content-Length" as CFString, String(messageData.count) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Width" as CFString, String(width) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Height" as CFString, String(height) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Orientation" as CFString, String(orientation) as CFString)
+        
+        CFHTTPMessageSetBody(httpResponse, messageData as CFData)
+        
+        let serializedMessage = CFHTTPMessageCopySerializedMessage(httpResponse)?.takeRetainedValue() as Data?
+      
+        return serializedMessage
+    }
+    
+    func jpegData(from buffer: CVPixelBuffer, scale scaleTransform: CGAffineTransform) -> Data? {
+        var image = CIImage(cvPixelBuffer: buffer)
+        image = image.transformed(by: scaleTransform)
+        
+        guard let colorSpace = image.colorSpace else {
+            return nil
+        }
+      
+        let options: [CIImageRepresentationOption: Float] = [kCGImageDestinationLossyCompressionQuality as CIImageRepresentationOption: 1.0]
+        let imageData = SampleUploader.imageContext.jpegRepresentation(of: image, colorSpace: colorSpace, options: options)
+      
+        return imageData
+    }
+}

ios/app/broadcast-extension/SocketConnection.h

@@ -1,34 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface SocketConnection : NSObject
-
-@property (nonatomic, copy, nullable) void (^didOpen)(void);
-@property (nonatomic, copy, nullable) void (^didClose)(NSError*);
-@property (nonatomic, copy, nullable) void (^streamHasSpaceAvailable)(void);
-
-- (instancetype)initWithFilePath:(nonnull NSString *)filePath;
-- (BOOL)open;
-- (void)close;
-- (NSInteger)writeBufferToStream:(const uint8_t*)buffer maxLength:(NSInteger)length;
-
-@end
-
-NS_ASSUME_NONNULL_END

ios/app/broadcast-extension/SocketConnection.m

@@ -1,189 +0,0 @@
-/*
- * Copyright @ 2021-present 8x8, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#import "SocketConnection.h"
-
-@interface SocketConnection () <NSStreamDelegate>
-
-@property (nonatomic, copy) NSString *filePath;
-
-@property (nonatomic, strong) NSInputStream *inputStream;
-@property (nonatomic, strong) NSOutputStream *outputStream;
-
-@property (nonatomic, strong) NSThread *networkThread;
-
-@end
-
-@implementation SocketConnection {
-  int _socket;
-  struct sockaddr_un _socketAddr;
-}
-
-- (instancetype)initWithFilePath:(NSString *)path {
-  self = [super init];
-  if (self) {
-    self.filePath = path;
-    
-    [self setupSocketWithFilePath:path];
-    [self setupNetworkThread];
-  }
-  
-  return self;
-}
-
-- (BOOL)open {
-  NSLog(@"Open socket connection");
-  
-  if (![[NSFileManager defaultManager] fileExistsAtPath:self.filePath]) {
-      NSLog(@"failure: socket file missing");
-      return false;
-  }
-
-  int status = connect(_socket, (struct sockaddr *)&_socketAddr, sizeof(_socketAddr));
-  if (status < 0) {
-      NSLog(@"failure: socket connect (%d)", status);
-      return false;
-  }
-  
-  [self.networkThread start];
-
-  CFReadStreamRef readStream;
-  CFWriteStreamRef writeStream;
-
-  CFStreamCreatePairWithSocket(kCFAllocatorDefault, _socket, &readStream, &writeStream);
-
-  self.inputStream = (__bridge_transfer NSInputStream *)readStream;
-  self.inputStream.delegate = self;
-  [self.inputStream setProperty:@"kCFBooleanTrue" forKey:@"kCFStreamPropertyShouldCloseNativeSocket"];
-
-  self.outputStream = (__bridge_transfer NSOutputStream *)writeStream;
-  self.outputStream.delegate = self;
-  [self.outputStream setProperty:@"kCFBooleanTrue" forKey:@"kCFStreamPropertyShouldCloseNativeSocket"];
-  
-  [self performSelector:@selector(scheduleStreams) onThread:self.networkThread withObject:nil waitUntilDone:true];
-
-  [self.inputStream open];
-  [self.outputStream open];
-
-  NSLog(@"read stream status: %ld", CFReadStreamGetStatus(readStream));
-  NSLog(@"write stream status: %ld", CFWriteStreamGetStatus(writeStream));
-  
-  return true;
-}
-
-- (void)close {
-  [self performSelector:@selector(unscheduleStreams) onThread:self.networkThread withObject:nil waitUntilDone:true];
-
-  self.inputStream.delegate = nil;
-  self.outputStream.delegate = nil;
-  
-  [self.inputStream close];
-  [self.outputStream close];
-
-  [self.networkThread cancel];
-}
-
-- (NSInteger)writeBufferToStream:(const uint8_t*)buffer maxLength:(NSInteger)length {
-  return [self.outputStream write:buffer maxLength:length];
-}
-
-// MARK: Private Methods
-
-- (BOOL)isOpen {
-  return self.inputStream.streamStatus == NSStreamStatusOpen && self.outputStream.streamStatus == NSStreamStatusOpen;
-}
-
-- (void)setupSocketWithFilePath:(NSString*)path {
-  _socket = socket(AF_UNIX, SOCK_STREAM, 0);
-  
-  memset(&_socketAddr, 0, sizeof(_socketAddr));
-  _socketAddr.sun_family = AF_UNIX;
-  strncpy(_socketAddr.sun_path, path.UTF8String, sizeof(_socketAddr.sun_path) - 1);
-}
-
-- (void)setupNetworkThread {
-  self.networkThread = [[NSThread alloc] initWithBlock:^{
-    do {
-      @autoreleasepool {
-        [[NSRunLoop currentRunLoop] run];
-      }
-    } while (![NSThread currentThread].isCancelled);
-  }];
-  self.networkThread.qualityOfService = NSQualityOfServiceUserInitiated;
-}
-
-- (void)scheduleStreams {
-  [self.inputStream scheduleInRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
-  [self.outputStream scheduleInRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
-}
-
-- (void)unscheduleStreams {
-  [self.inputStream removeFromRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
-  [self.outputStream removeFromRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
-}
-
-- (void)notifyDidClose:(NSError *)error {
-  if (self.didClose) {
-    self.didClose(error);
-  }
-}
-
-@end
-
-#pragma mark - NSStreamDelegate
-
-@implementation SocketConnection (NSStreamDelegate)
-
-- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode {
-  switch (eventCode) {
-    case NSStreamEventOpenCompleted:
-      NSLog(@"client stream open completed");
-      if (aStream == self.outputStream && self.didOpen) {
-        self.didOpen();
-      }
-      break;
-    case NSStreamEventHasBytesAvailable:
-      if (aStream == self.inputStream) {
-        uint8_t buffer;
-        NSInteger numberOfBytesRead = [(NSInputStream *)aStream read:&buffer maxLength:sizeof(buffer)];
-        if (!numberOfBytesRead && aStream.streamStatus == NSStreamStatusAtEnd) {
-          NSLog(@"server socket closed");
-          [self close];
-          [self notifyDidClose:nil];
-        }
-      }
-      break;
-    case NSStreamEventHasSpaceAvailable:
-      if (aStream == self.outputStream && self.streamHasSpaceAvailable) {
-        NSLog(@"client stream has space available");
-        self.streamHasSpaceAvailable();
-      }
-      break;
-    case NSStreamEventErrorOccurred:
-      NSLog(@"client stream error occurred: %@", aStream.streamError);
-      [self close];
-      [self notifyDidClose:aStream.streamError];
-      break;
-      
-    default:
-      break;
-  }
-}
-
-@end

ios/app/broadcast-extension/SocketConnection.swift

@@ -0,0 +1,205 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import Foundation
+
+class SocketConnection: NSObject {
+    var didOpen: (() -> Void)?
+    var didClose: ((Error?) -> Void)?
+    var streamHasSpaceAvailable: (() -> Void)?
+
+    private let filePath: String
+    private var socketHandle: Int32 = -1
+    private var address: sockaddr_un?
+
+    private var inputStream: InputStream?
+    private var outputStream: OutputStream?
+    
+    private var networkQueue: DispatchQueue?
+    private var shouldKeepRunning = false
+
+    init?(filePath path: String) {
+        filePath = path
+        socketHandle = Darwin.socket(AF_UNIX, SOCK_STREAM, 0)
+
+        guard socketHandle != -1 else {
+            print("failure: create socket")
+            return nil
+        }
+    }
+
+    func open() -> Bool {
+        print("open socket connection")
+
+        guard FileManager.default.fileExists(atPath: filePath) else {
+            print("failure: socket file missing")
+            return false
+        }
+      
+        guard setupAddress() == true else {
+            return false
+        }
+        
+        guard connectSocket() == true else {
+            return false
+        }
+
+        setupStreams()
+        
+        inputStream?.open()
+        outputStream?.open()
+
+        return true
+    }
+
+    func close() {
+        unscheduleStreams()
+
+        inputStream?.delegate = nil
+        outputStream?.delegate = nil
+
+        inputStream?.close()
+        outputStream?.close()
+        
+        inputStream = nil
+        outputStream = nil
+    }
+
+    func writeToStream(buffer: UnsafePointer<UInt8>, maxLength length: Int) -> Int {
+        return outputStream?.write(buffer, maxLength: length) ?? 0
+    }
+}
+
+extension SocketConnection: StreamDelegate {
+
+    func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
+        switch eventCode {
+        case .openCompleted:
+            print("client stream open completed")
+            if aStream == outputStream {
+                didOpen?()
+            }
+        case .hasBytesAvailable:
+            if aStream == inputStream {
+                var buffer: UInt8 = 0
+                let numberOfBytesRead = inputStream?.read(&buffer, maxLength: 1)
+                if numberOfBytesRead == 0 && aStream.streamStatus == .atEnd {
+                    print("server socket closed")
+                    close()
+                    notifyDidClose(error: nil)
+                }
+            }
+        case .hasSpaceAvailable:
+            if aStream == outputStream {
+                streamHasSpaceAvailable?()
+            }
+        case .errorOccurred:
+            print("client stream error occured: \(String(describing: aStream.streamError))")
+            close()
+            notifyDidClose(error: aStream.streamError)
+
+        default:
+            break
+        }
+    }
+}
+
+private extension SocketConnection {
+  
+    func setupAddress() -> Bool {
+        var addr = sockaddr_un()
+        guard filePath.count < MemoryLayout.size(ofValue: addr.sun_path) else {
+            print("failure: fd path is too long")
+            return false
+        }
+
+        _ = withUnsafeMutablePointer(to: &addr.sun_path.0) { ptr in
+            filePath.withCString {
+                strncpy(ptr, $0, filePath.count)
+            }
+        }
+        
+        address = addr
+        return true
+    }
+
+    func connectSocket() -> Bool {
+        guard var addr = address else {
+            return false
+        }
+        
+        let status = withUnsafePointer(to: &addr) { ptr in
+            ptr.withMemoryRebound(to: sockaddr.self, capacity: 1) {
+                Darwin.connect(socketHandle, $0, socklen_t(MemoryLayout<sockaddr_un>.size))
+            }
+        }
+
+        guard status == noErr else {
+            print("failure: \(status)")
+            return false
+        }
+        
+        return true
+    }
+
+    func setupStreams() {
+        var readStream: Unmanaged<CFReadStream>?
+        var writeStream: Unmanaged<CFWriteStream>?
+
+        CFStreamCreatePairWithSocket(kCFAllocatorDefault, socketHandle, &readStream, &writeStream)
+
+        inputStream = readStream?.takeRetainedValue()
+        inputStream?.delegate = self
+        inputStream?.setProperty(kCFBooleanTrue, forKey: Stream.PropertyKey(kCFStreamPropertyShouldCloseNativeSocket as String))
+
+        outputStream = writeStream?.takeRetainedValue()
+        outputStream?.delegate = self
+        outputStream?.setProperty(kCFBooleanTrue, forKey: Stream.PropertyKey(kCFStreamPropertyShouldCloseNativeSocket as String))
+
+        scheduleStreams()
+    }
+  
+    func scheduleStreams() {
+        shouldKeepRunning = true
+        
+        networkQueue = DispatchQueue.global(qos: .userInitiated)
+        networkQueue?.async { [weak self] in
+            self?.inputStream?.schedule(in: .current, forMode: .common)
+            self?.outputStream?.schedule(in: .current, forMode: .common)
+            
+            var isRunning = false
+                        
+            repeat {
+                isRunning = self?.shouldKeepRunning ?? false && RunLoop.current.run(mode: .default, before: .distantFuture)
+            } while (isRunning)
+        }
+    }
+    
+    func unscheduleStreams() {
+        networkQueue?.sync { [weak self] in
+            self?.inputStream?.remove(from: .current, forMode: .common)
+            self?.outputStream?.remove(from: .current, forMode: .common)
+        }
+        
+        shouldKeepRunning = false
+    }
+    
+    func notifyDidClose(error: Error?) {
+        if didClose != nil {
+            didClose?(error)
+        }
+    }
+}