Fix Cronet multiple initialization problem

src/objective-c/tests/CronetTests/CoreCronetEnd2EndTests.mm

@@ -49,6 +49,8 @@
 #import <Cronet/Cronet.h>
 #include <grpc/grpc_cronet.h>
 
+#import "../EnableCronet.h"
+
 typedef struct fullstack_secure_fixture_data {
   char *localaddr;
 } fullstack_secure_fixture_data;
@@ -176,13 +178,7 @@ static char *roots_filename;
 
   grpc_init();
 
-  [Cronet setHttp2Enabled:YES];
-  [Cronet enableTestCertVerifierForTesting];
-  NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
-                                                       inDomains:NSUserDomainMask] lastObject];
-  NSLog(@"Documents directory: %@", url);
-  [Cronet start];
-  [Cronet startNetLogToFile:@"cronet_netlog.json" logBytes:YES];
+  enableCronet();
 }
 
 // The tearDown() function is run after all test cases finish running

src/objective-c/tests/CronetTests/CronetUnitTests.mm

@@ -20,6 +20,8 @@
 #import <netinet/in.h>
 #import <sys/socket.h>
 
+#import "../EnableCronet.h"
+
 #import <Cronet/Cronet.h>
 #import <grpc/grpc.h>
 #import <grpc/grpc_cronet.h>
@@ -61,16 +63,7 @@ static void drain_cq(grpc_completion_queue *cq) {
   grpc_test_init(1, argv);
 
   grpc_init();
-
-  [Cronet setHttp2Enabled:YES];
-  [Cronet setSslKeyLogFileName:@"Documents/key"];
-  [Cronet enableTestCertVerifierForTesting];
-  NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
-                                                       inDomains:NSUserDomainMask] lastObject];
-  NSLog(@"Documents directory: %@", url);
-  [Cronet start];
-  [Cronet startNetLogToFile:@"Documents/cronet_netlog.json" logBytes:YES];
-
+  enableCronet();
   init_ssl();
 }
 

src/objective-c/tests/CronetTests/InteropTestsRemoteWithCronet.m

@@ -44,6 +44,10 @@ static int32_t kRemoteInteropServerOverhead = 12;
   return kRemoteSSLHost;
 }
 
++ (BOOL)useCronet {
+  return YES;
+}
+
 - (int32_t)encodingOverhead {
   return kRemoteInteropServerOverhead;  // bytes
 }

src/objective-c/tests/EnableCronet.h

@@ -0,0 +1,34 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * 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.
+ *
+ */
+
+#ifdef GRPC_COMPILE_WITH_CRONET
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Enable Cronet for once.
+ */
+void enableCronet();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/objective-c/tests/EnableCronet.m

@@ -0,0 +1,38 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * 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.
+ *
+ */
+
+#ifdef GRPC_COMPILE_WITH_CRONET
+
+#import <Cronet/Cronet.h>
+#import "EnableCronet.h"
+
+void enableCronet(void) {
+  static dispatch_once_t enableCronet;
+  dispatch_once(&enableCronet, ^{
+    [Cronet setHttp2Enabled:YES];
+    [Cronet setSslKeyLogFileName:@"Documents/key"];
+    [Cronet enableTestCertVerifierForTesting];
+    NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
+                                                         inDomains:NSUserDomainMask] lastObject];
+    NSLog(@"Documents directory: %@", url);
+    [Cronet start];
+    [Cronet startNetLogToFile:@"cronet_netlog.json" logBytes:YES];
+  });
+}
+
+#endif

src/objective-c/tests/InteropTests/InteropTests.h

@@ -59,4 +59,9 @@
  */
 + (NSString *)hostNameOverride;
 
+/**
+ * Whether to use Cronet for all the v1 API tests in the test suite.
+ */
++ (BOOL)useCronet;
+
 @end

src/objective-c/tests/InteropTests/InteropTests.m

@@ -37,6 +37,7 @@
 #import <grpc/support/log.h>
 
 #import "InteropTestsBlockCallbacks.h"
+#import "../enableCronet.h"
 
 #define TEST_TIMEOUT 32
 
@@ -107,16 +108,17 @@ BOOL isRemoteInteropTest(NSString *host) {
   return nil;
 }
 
++ (BOOL)useCronet {
+  return NO;
+}
+
 + (void)setUp {
   NSLog(@"InteropTest Started, class: %@", [[self class] description]);
 #ifdef GRPC_COMPILE_WITH_CRONET
-  static dispatch_once_t *enableCronet;
-  dispatch_once(enableCronet, ^{
-    // Cronet setup
-    [Cronet setHttp2Enabled:YES];
-    [Cronet start];
+  enableCronet();
+  if ([self useCronet]) {
     [GRPCCall useCronetWithEngine:[Cronet getGlobalEngine]];
-  });
+  }
 #endif
 #ifdef GRPC_CFSTREAM
   setenv(kCFStreamVarName, "1", 1);

src/objective-c/tests/Tests.xcodeproj/project.pbxproj

@@ -11,6 +11,8 @@
 		5E3F14842278B461007C6D90 /* InteropTestsBlockCallbacks.m in Sources */ = {isa = PBXBuildFile; fileRef = 5E3F14832278B461007C6D90 /* InteropTestsBlockCallbacks.m */; };
 		5E3F14852278BF5D007C6D90 /* InteropTestsBlockCallbacks.m in Sources */ = {isa = PBXBuildFile; fileRef = 5E3F14832278B461007C6D90 /* InteropTestsBlockCallbacks.m */; };
 		5E3F14862278BFFF007C6D90 /* InteropTestsBlockCallbacks.m in Sources */ = {isa = PBXBuildFile; fileRef = 5E3F14832278B461007C6D90 /* InteropTestsBlockCallbacks.m */; };
+		5E3F148D22792856007C6D90 /* EnableCronet.m in Sources */ = {isa = PBXBuildFile; fileRef = 5E3F1487227918AA007C6D90 /* EnableCronet.m */; };
+		5E3F148E22792AF5007C6D90 /* EnableCronet.m in Sources */ = {isa = PBXBuildFile; fileRef = 5E3F1487227918AA007C6D90 /* EnableCronet.m */; };
 		5E7F486422775B37006656AD /* InteropTestsRemoteWithCronet.m in Sources */ = {isa = PBXBuildFile; fileRef = 5EE84BF31D4717E40050C6CC /* InteropTestsRemoteWithCronet.m */; };
 		5E7F486522775B41006656AD /* CronetUnitTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 5EAD6D261E27047400002378 /* CronetUnitTests.mm */; };
 		5E7F486E22778086006656AD /* CoreCronetEnd2EndTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 5E7F486D22778086006656AD /* CoreCronetEnd2EndTests.mm */; };
@@ -92,6 +94,8 @@
 		5E0282E8215AA697007AC99D /* NSErrorUnitTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = NSErrorUnitTests.m; sourceTree = "<group>"; };
 		5E3F14822278B42D007C6D90 /* InteropTestsBlockCallbacks.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = InteropTestsBlockCallbacks.h; sourceTree = "<group>"; };
 		5E3F14832278B461007C6D90 /* InteropTestsBlockCallbacks.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = InteropTestsBlockCallbacks.m; sourceTree = "<group>"; };
+		5E3F1487227918AA007C6D90 /* EnableCronet.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = EnableCronet.m; sourceTree = "<group>"; };
+		5E3F148A227918C4007C6D90 /* EnableCronet.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = EnableCronet.h; sourceTree = "<group>"; };
 		5E7F485922775B15006656AD /* CronetTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = CronetTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		5E7F486622776AD8006656AD /* Cronet.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Cronet.framework; path = Pods/CronetFramework/Cronet.framework; sourceTree = "<group>"; };
 		5E7F486D22778086006656AD /* CoreCronetEnd2EndTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = CoreCronetEnd2EndTests.mm; sourceTree = "<group>"; };
@@ -392,6 +396,8 @@
 		635697C91B14FC11007A7283 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
+				5E3F148A227918C4007C6D90 /* EnableCronet.h */,
+				5E3F1487227918AA007C6D90 /* EnableCronet.m */,
 				5EAFE8271F8EFB87007F2189 /* version.h */,
 				635697D71B14FC11007A7283 /* Supporting Files */,
 			);
@@ -813,6 +819,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				5E3F14852278BF5D007C6D90 /* InteropTestsBlockCallbacks.m in Sources */,
+				5E3F148D22792856007C6D90 /* EnableCronet.m in Sources */,
 				5E7F486E22778086006656AD /* CoreCronetEnd2EndTests.mm in Sources */,
 				5E7F488522778A88006656AD /* InteropTests.m in Sources */,
 				5E7F486422775B37006656AD /* InteropTestsRemoteWithCronet.m in Sources */,
@@ -825,6 +832,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				5E3F14842278B461007C6D90 /* InteropTestsBlockCallbacks.m in Sources */,
+				5E3F148E22792AF5007C6D90 /* EnableCronet.m in Sources */,
 				5E7F488922778B04006656AD /* InteropTestsRemote.m in Sources */,
 				5E7F487922778226006656AD /* InteropTestsMultipleChannels.m in Sources */,
 				5EA477042273617B000F72FC /* InteropTestsLocalCleartext.m in Sources */,

src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/CronetTests.xcscheme

@@ -37,6 +37,11 @@
                BlueprintName = "CronetTests"
                ReferencedContainer = "container:Tests.xcodeproj">
             </BuildableReference>
+            <SkippedTests>
+               <Test
+                  Identifier = "InteropTests">
+               </Test>
+            </SkippedTests>
          </TestableReference>
       </Testables>
       <AdditionalOptions>