[camera] Convert iOS Obj-C->Dart calls to Pigeon (flutter#6568)

Converts all of the Obj-C -> Dart calls to Pigeon, using the new suffix-based Pigeon API instantiation feature.

This required decentralizing some threading code slightly: since method channel calls only involve one method (due to the lack of strong types), a wrapper that automatically did thread bouncing was feasible, but with Pigeon it's not since a wrapper would have to duplicate the entire API surface, and that's more work than just doing the dispatches at the call site.

Part of flutter/flutter#117905

packages/camera/camera_avfoundation/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.15+4
+
+* Converts host-to-Dart communcation to Pigeon.
+
 ## 0.9.15+3
 
 * Moves `pigeon` to `dev_dependencies`.

packages/camera/camera_avfoundation/example/ios/Runner.xcodeproj/project.pbxproj

@@ -29,7 +29,6 @@
 		E071CF7227B3061B006EF3BA /* FLTCamPhotoCaptureTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E071CF7127B3061B006EF3BA /* FLTCamPhotoCaptureTests.m */; };
 		E071CF7427B31DE4006EF3BA /* FLTCamSampleBufferTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E071CF7327B31DE4006EF3BA /* FLTCamSampleBufferTests.m */; };
 		E0B0D2BB27DFF2AF00E71E4B /* CameraPermissionTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E0B0D2BA27DFF2AF00E71E4B /* CameraPermissionTests.m */; };
-		E0C6E2002770F01A00EA6AA3 /* ThreadSafeMethodChannelTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E0C6E1FD2770F01A00EA6AA3 /* ThreadSafeMethodChannelTests.m */; };
 		E0C6E2012770F01A00EA6AA3 /* ThreadSafeTextureRegistryTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E0C6E1FE2770F01A00EA6AA3 /* ThreadSafeTextureRegistryTests.m */; };
 		E0C6E2022770F01A00EA6AA3 /* ThreadSafeEventChannelTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E0C6E1FF2770F01A00EA6AA3 /* ThreadSafeEventChannelTests.m */; };
 		E0CDBAC227CD9729002561D9 /* CameraTestUtils.m in Sources */ = {isa = PBXBuildFile; fileRef = E0CDBAC127CD9729002561D9 /* CameraTestUtils.m */; };
@@ -96,7 +95,6 @@
 		E071CF7127B3061B006EF3BA /* FLTCamPhotoCaptureTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = FLTCamPhotoCaptureTests.m; sourceTree = "<group>"; };
 		E071CF7327B31DE4006EF3BA /* FLTCamSampleBufferTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = FLTCamSampleBufferTests.m; sourceTree = "<group>"; };
 		E0B0D2BA27DFF2AF00E71E4B /* CameraPermissionTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = CameraPermissionTests.m; sourceTree = "<group>"; };
-		E0C6E1FD2770F01A00EA6AA3 /* ThreadSafeMethodChannelTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ThreadSafeMethodChannelTests.m; sourceTree = "<group>"; };
 		E0C6E1FE2770F01A00EA6AA3 /* ThreadSafeTextureRegistryTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ThreadSafeTextureRegistryTests.m; sourceTree = "<group>"; };
 		E0C6E1FF2770F01A00EA6AA3 /* ThreadSafeEventChannelTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ThreadSafeEventChannelTests.m; sourceTree = "<group>"; };
 		E0CDBAC027CD9729002561D9 /* CameraTestUtils.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = CameraTestUtils.h; sourceTree = "<group>"; };
@@ -134,7 +132,6 @@
 				03BB766C2665316900CE5A93 /* Info.plist */,
 				033B94BD269C40A200B4DF97 /* CameraMethodChannelTests.m */,
 				E0C6E1FF2770F01A00EA6AA3 /* ThreadSafeEventChannelTests.m */,
-				E0C6E1FD2770F01A00EA6AA3 /* ThreadSafeMethodChannelTests.m */,
 				E0C6E1FE2770F01A00EA6AA3 /* ThreadSafeTextureRegistryTests.m */,
 				E04F108527A87CA600573D0C /* FLTSavePhotoDelegateTests.m */,
 				E071CF7127B3061B006EF3BA /* FLTCamPhotoCaptureTests.m */,
@@ -454,7 +451,6 @@
 				E0C6E2022770F01A00EA6AA3 /* ThreadSafeEventChannelTests.m in Sources */,
 				E0C6E2012770F01A00EA6AA3 /* ThreadSafeTextureRegistryTests.m in Sources */,
 				E0B0D2BB27DFF2AF00E71E4B /* CameraPermissionTests.m in Sources */,
-				E0C6E2002770F01A00EA6AA3 /* ThreadSafeMethodChannelTests.m in Sources */,
 				E01EE4A82799F3A5008C1950 /* QueueUtilsTests.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

packages/camera/camera_avfoundation/example/ios/RunnerTests/CameraFocusTests.m

@@ -37,7 +37,7 @@ - (void)testAutoFocusWithContinuousModeSupported_ShouldSetContinuousAutoFocus {
   [[_mockDevice reject] setFocusMode:AVCaptureFocusModeAutoFocus];
 
   // Run test
-  [_camera applyFocusMode:FLTFocusModeAuto onDevice:_mockDevice];
+  [_camera applyFocusMode:FCPPlatformFocusModeAuto onDevice:_mockDevice];
 
   // Expect setFocusMode:AVCaptureFocusModeContinuousAutoFocus
   OCMVerify([_mockDevice setFocusMode:AVCaptureFocusModeContinuousAutoFocus]);
@@ -54,7 +54,7 @@ - (void)testAutoFocusWithContinuousModeNotSupported_ShouldSetAutoFocus {
   [[_mockDevice reject] setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
 
   // Run test
-  [_camera applyFocusMode:FLTFocusModeAuto onDevice:_mockDevice];
+  [_camera applyFocusMode:FCPPlatformFocusModeAuto onDevice:_mockDevice];
 
   // Expect setFocusMode:AVCaptureFocusModeAutoFocus
   OCMVerify([_mockDevice setFocusMode:AVCaptureFocusModeAutoFocus]);
@@ -72,7 +72,7 @@ - (void)testAutoFocusWithNoModeSupported_ShouldSetNothing {
   [[_mockDevice reject] setFocusMode:AVCaptureFocusModeAutoFocus];
 
   // Run test
-  [_camera applyFocusMode:FLTFocusModeAuto onDevice:_mockDevice];
+  [_camera applyFocusMode:FCPPlatformFocusModeAuto onDevice:_mockDevice];
 }
 
 - (void)testLockedFocusWithModeSupported_ShouldSetModeAutoFocus {
@@ -85,7 +85,7 @@ - (void)testLockedFocusWithModeSupported_ShouldSetModeAutoFocus {
   [[_mockDevice reject] setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
 
   // Run test
-  [_camera applyFocusMode:FLTFocusModeLocked onDevice:_mockDevice];
+  [_camera applyFocusMode:FCPPlatformFocusModeLocked onDevice:_mockDevice];
 
   // Expect setFocusMode:AVCaptureFocusModeAutoFocus
   OCMVerify([_mockDevice setFocusMode:AVCaptureFocusModeAutoFocus]);
@@ -102,7 +102,7 @@ - (void)testLockedFocusWithModeNotSupported_ShouldSetNothing {
   [[_mockDevice reject] setFocusMode:AVCaptureFocusModeAutoFocus];
 
   // Run test
-  [_camera applyFocusMode:FLTFocusModeLocked onDevice:_mockDevice];
+  [_camera applyFocusMode:FCPPlatformFocusModeLocked onDevice:_mockDevice];
 }
 
 - (void)testSetFocusPointWithResult_SetsFocusPointOfInterest {

packages/camera/camera_avfoundation/example/ios/RunnerTests/CameraOrientationTests.m

@@ -9,44 +9,87 @@
 
 #import <OCMock/OCMock.h>
 
+@interface StubGlobalEventApi : FCPCameraGlobalEventApi
+@property(nonatomic) BOOL called;
+@property(nonatomic) FCPPlatformDeviceOrientation lastOrientation;
+@end
+
+@implementation StubGlobalEventApi
+- (void)deviceOrientationChangedOrientation:(FCPPlatformDeviceOrientation)orientation
+                                 completion:(void (^)(FlutterError *_Nullable))completion {
+  self.called = YES;
+  self.lastOrientation = orientation;
+  completion(nil);
+}
+
+- (FlutterBinaryMessengerConnection)setMessageHandlerOnChannel:(nonnull NSString *)channel
+                                          binaryMessageHandler:
+                                              (nullable FlutterBinaryMessageHandler)handler {
+  return 0;
+}
+
+@end
+
+#pragma mark -
+
 @interface CameraOrientationTests : XCTestCase
 @end
 
 @implementation CameraOrientationTests
 
+// Ensure that the given queue and then the main queue have both cycled, to wait for any pending
+// async events that may have been bounced between them.
+- (void)waitForRoundTripWithQueue:(dispatch_queue_t)queue {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] initWithDescription:@"Queue flush"];
+  dispatch_async(queue, ^{
+    dispatch_async(dispatch_get_main_queue(), ^{
+      [expectation fulfill];
+    });
+  });
+  [self waitForExpectations:@[ expectation ]];
+}
+
+- (void)sendOrientation:(UIDeviceOrientation)orientation toCamera:(CameraPlugin *)cameraPlugin {
+  [cameraPlugin orientationChanged:[self createMockNotificationForOrientation:orientation]];
+  [self waitForRoundTripWithQueue:cameraPlugin.captureSessionQueue];
+}
+
 - (void)testOrientationNotifications {
-  id mockMessenger = OCMProtocolMock(@protocol(FlutterBinaryMessenger));
-  CameraPlugin *cameraPlugin = [[CameraPlugin alloc] initWithRegistry:nil messenger:mockMessenger];
-
-  [mockMessenger setExpectationOrderMatters:YES];
-
-  [self rotate:UIDeviceOrientationPortraitUpsideDown
-      expectedChannelOrientation:@"portraitDown"
-                    cameraPlugin:cameraPlugin
-                       messenger:mockMessenger];
-  [self rotate:UIDeviceOrientationPortrait
-      expectedChannelOrientation:@"portraitUp"
-                    cameraPlugin:cameraPlugin
-                       messenger:mockMessenger];
-  [self rotate:UIDeviceOrientationLandscapeLeft
-      expectedChannelOrientation:@"landscapeLeft"
-                    cameraPlugin:cameraPlugin
-                       messenger:mockMessenger];
-  [self rotate:UIDeviceOrientationLandscapeRight
-      expectedChannelOrientation:@"landscapeRight"
-                    cameraPlugin:cameraPlugin
-                       messenger:mockMessenger];
-
-  OCMReject([mockMessenger sendOnChannel:[OCMArg any] message:[OCMArg any]]);
-
-  // No notification when flat.
-  [cameraPlugin
-      orientationChanged:[self createMockNotificationForOrientation:UIDeviceOrientationFaceUp]];
-  // No notification when facedown.
-  [cameraPlugin
-      orientationChanged:[self createMockNotificationForOrientation:UIDeviceOrientationFaceDown]];
-
-  OCMVerifyAll(mockMessenger);
+  StubGlobalEventApi *eventAPI = [[StubGlobalEventApi alloc] init];
+  CameraPlugin *cameraPlugin = [[CameraPlugin alloc] initWithRegistry:nil
+                                                            messenger:nil
+                                                            globalAPI:eventAPI];
+
+  [self sendOrientation:UIDeviceOrientationPortraitUpsideDown toCamera:cameraPlugin];
+  XCTAssertEqual(eventAPI.lastOrientation, FCPPlatformDeviceOrientationPortraitDown);
+  [self sendOrientation:UIDeviceOrientationPortrait toCamera:cameraPlugin];
+  XCTAssertEqual(eventAPI.lastOrientation, FCPPlatformDeviceOrientationPortraitUp);
+  [self sendOrientation:UIDeviceOrientationLandscapeLeft toCamera:cameraPlugin];
+  XCTAssertEqual(eventAPI.lastOrientation, FCPPlatformDeviceOrientationLandscapeLeft);
+  [self sendOrientation:UIDeviceOrientationLandscapeRight toCamera:cameraPlugin];
+  XCTAssertEqual(eventAPI.lastOrientation, FCPPlatformDeviceOrientationLandscapeRight);
+}
+
+- (void)testOrientationNotificationsNotCalledForFaceUp {
+  StubGlobalEventApi *eventAPI = [[StubGlobalEventApi alloc] init];
+  CameraPlugin *cameraPlugin = [[CameraPlugin alloc] initWithRegistry:nil
+                                                            messenger:nil
+                                                            globalAPI:eventAPI];
+
+  [self sendOrientation:UIDeviceOrientationFaceUp toCamera:cameraPlugin];
+
+  XCTAssertFalse(eventAPI.called);
+}
+
+- (void)testOrientationNotificationsNotCalledForFaceDown {
+  StubGlobalEventApi *eventAPI = [[StubGlobalEventApi alloc] init];
+  CameraPlugin *cameraPlugin = [[CameraPlugin alloc] initWithRegistry:nil
+                                                            messenger:nil
+                                                            globalAPI:eventAPI];
+
+  [self sendOrientation:UIDeviceOrientationFaceDown toCamera:cameraPlugin];
+
+  XCTAssertFalse(eventAPI.called);
 }
 
 - (void)testOrientationUpdateMustBeOnCaptureSessionQueue {
@@ -71,40 +114,20 @@ - (void)testOrientationUpdateMustBeOnCaptureSessionQueue {
   [self waitForExpectationsWithTimeout:1 handler:nil];
 }
 
-- (void)rotate:(UIDeviceOrientation)deviceOrientation
-    expectedChannelOrientation:(NSString *)channelOrientation
-                  cameraPlugin:(CameraPlugin *)cameraPlugin
-                     messenger:(NSObject<FlutterBinaryMessenger> *)messenger {
-  XCTestExpectation *orientationExpectation = [self expectationWithDescription:channelOrientation];
-
-  OCMExpect([messenger
-      sendOnChannel:[OCMArg any]
-            message:[OCMArg checkWithBlock:^BOOL(NSData *data) {
-              NSObject<FlutterMethodCodec> *codec = [FlutterStandardMethodCodec sharedInstance];
-              FlutterMethodCall *methodCall = [codec decodeMethodCall:data];
-              [orientationExpectation fulfill];
-              return
-                  [methodCall.method isEqualToString:@"orientation_changed"] &&
-                  [methodCall.arguments isEqualToDictionary:@{@"orientation" : channelOrientation}];
-            }]]);
-
-  [cameraPlugin orientationChanged:[self createMockNotificationForOrientation:deviceOrientation]];
-  [self waitForExpectationsWithTimeout:30.0 handler:nil];
-}
-
 - (void)testOrientationChanged_noRetainCycle {
   dispatch_queue_t captureSessionQueue = dispatch_queue_create("capture_session_queue", NULL);
   FLTCam *mockCam = OCMClassMock([FLTCam class]);
-  FLTThreadSafeMethodChannel *mockChannel = OCMClassMock([FLTThreadSafeMethodChannel class]);
+  StubGlobalEventApi *stubAPI = [[StubGlobalEventApi alloc] init];
 
   __weak CameraPlugin *weakCamera;
 
   @autoreleasepool {
-    CameraPlugin *camera = [[CameraPlugin alloc] initWithRegistry:nil messenger:nil];
+    CameraPlugin *camera = [[CameraPlugin alloc] initWithRegistry:nil
+                                                        messenger:nil
+                                                        globalAPI:stubAPI];
     weakCamera = camera;
     camera.captureSessionQueue = captureSessionQueue;
     camera.camera = mockCam;
-    camera.deviceEventMethodChannel = mockChannel;
 
     [camera orientationChanged:
                 [self createMockNotificationForOrientation:UIDeviceOrientationLandscapeLeft]];
@@ -118,11 +141,11 @@ - (void)testOrientationChanged_noRetainCycle {
       [self expectationWithDescription:@"Dispatched to capture session queue"];
   dispatch_async(captureSessionQueue, ^{
     OCMVerify(never(), [mockCam setDeviceOrientation:UIDeviceOrientationLandscapeLeft]);
-    OCMVerify(never(), [mockChannel invokeMethod:@"orientation_changed" arguments:OCMOCK_ANY]);
+    XCTAssertFalse(stubAPI.called);
     [expectation fulfill];
   });
 
-  [self waitForExpectationsWithTimeout:1 handler:nil];
+  [self waitForExpectationsWithTimeout:30 handler:nil];
 }
 
 - (NSNotification *)createMockNotificationForOrientation:(UIDeviceOrientation)deviceOrientation {

packages/camera/camera_avfoundation/example/ios/RunnerTests/CameraPropertiesTests.m

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+@import camera_avfoundation;
 @import camera_avfoundation.Test;
 @import AVFoundation;
 @import XCTest;
@@ -31,30 +32,16 @@ - (void)testFLTGetAVCaptureFlashModeForFLTFlashMode {
 
 #pragma mark - exposure mode tests
 
-- (void)testFLTGetStringForFLTExposureMode {
-  XCTAssertEqualObjects(@"auto", FLTGetStringForFLTExposureMode(FLTExposureModeAuto));
-  XCTAssertEqualObjects(@"locked", FLTGetStringForFLTExposureMode(FLTExposureModeLocked));
-  XCTAssertNil(FLTGetStringForFLTExposureMode(-1));
-}
-
-- (void)testFLTGetFLTExposureModeForString {
-  XCTAssertEqual(FLTExposureModeAuto, FLTGetFLTExposureModeForString(@"auto"));
-  XCTAssertEqual(FLTExposureModeLocked, FLTGetFLTExposureModeForString(@"locked"));
-  XCTAssertEqual(FLTExposureModeInvalid, FLTGetFLTExposureModeForString(@"unknown"));
+- (void)testFCPGetExposureModeForString {
+  XCTAssertEqual(FCPPlatformExposureModeAuto, FCPGetExposureModeForString(@"auto"));
+  XCTAssertEqual(FCPPlatformExposureModeLocked, FCPGetExposureModeForString(@"locked"));
 }
 
 #pragma mark - focus mode tests
 
-- (void)testFLTGetStringForFLTFocusMode {
-  XCTAssertEqualObjects(@"auto", FLTGetStringForFLTFocusMode(FLTFocusModeAuto));
-  XCTAssertEqualObjects(@"locked", FLTGetStringForFLTFocusMode(FLTFocusModeLocked));
-  XCTAssertNil(FLTGetStringForFLTFocusMode(-1));
-}
-
 - (void)testFLTGetFLTFocusModeForString {
-  XCTAssertEqual(FLTFocusModeAuto, FLTGetFLTFocusModeForString(@"auto"));
-  XCTAssertEqual(FLTFocusModeLocked, FLTGetFLTFocusModeForString(@"locked"));
-  XCTAssertEqual(FLTFocusModeInvalid, FLTGetFLTFocusModeForString(@"unknown"));
+  XCTAssertEqual(FCPPlatformFocusModeAuto, FCPGetFocusModeForString(@"auto"));
+  XCTAssertEqual(FCPPlatformFocusModeLocked, FCPGetFocusModeForString(@"locked"));
 }
 
 #pragma mark - resolution preset tests
@@ -93,15 +80,17 @@ - (void)testFLTGetUIDeviceOrientationForString {
 }
 
 - (void)testFLTGetStringForUIDeviceOrientation {
-  XCTAssertEqualObjects(@"portraitDown",
-                        FLTGetStringForUIDeviceOrientation(UIDeviceOrientationPortraitUpsideDown));
-  XCTAssertEqualObjects(@"landscapeLeft",
-                        FLTGetStringForUIDeviceOrientation(UIDeviceOrientationLandscapeLeft));
-  XCTAssertEqualObjects(@"landscapeRight",
-                        FLTGetStringForUIDeviceOrientation(UIDeviceOrientationLandscapeRight));
-  XCTAssertEqualObjects(@"portraitUp",
-                        FLTGetStringForUIDeviceOrientation(UIDeviceOrientationPortrait));
-  XCTAssertEqualObjects(@"portraitUp", FLTGetStringForUIDeviceOrientation(-1));
+  XCTAssertEqual(
+      FCPPlatformDeviceOrientationPortraitDown,
+      FCPGetPigeonDeviceOrientationForOrientation(UIDeviceOrientationPortraitUpsideDown));
+  XCTAssertEqual(FCPPlatformDeviceOrientationLandscapeLeft,
+                 FCPGetPigeonDeviceOrientationForOrientation(UIDeviceOrientationLandscapeLeft));
+  XCTAssertEqual(FCPPlatformDeviceOrientationLandscapeRight,
+                 FCPGetPigeonDeviceOrientationForOrientation(UIDeviceOrientationLandscapeRight));
+  XCTAssertEqual(FCPPlatformDeviceOrientationPortraitUp,
+                 FCPGetPigeonDeviceOrientationForOrientation(UIDeviceOrientationPortrait));
+  XCTAssertEqual(FCPPlatformDeviceOrientationPortraitUp,
+                 FCPGetPigeonDeviceOrientationForOrientation(-1));
 }
 
 #pragma mark - file format tests