Establish Objective C end-to-end core test with Cronet

13 files changed, 944 insertions, 0 deletions

diff --git a/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.pbxproj b/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.pbxproj
new file mode 100644
index 0000000000..bc5006e936
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.pbxproj
@@ -0,0 +1,405 @@
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+}
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000000..220e863b89
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:End2EndTest.xcodeproj">
+   </FileRef>
+</Workspace>
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.h b/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.h
new file mode 100644
index 0000000000..dbc592fcc8
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.h
@@ -0,0 +1,17 @@
+//
+//  AppDelegate.h
+//  End2EndTest
+//
+//  Created by mxyan on 7/11/16.
+//  Copyright © 2016 Google. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+
+@end
+
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.m b/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.m
new file mode 100644
index 0000000000..a4beef9954
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/AppDelegate.m
@@ -0,0 +1,45 @@
+//
+//  AppDelegate.m
+//  End2EndTest
+//
+//  Created by mxyan on 7/11/16.
+//  Copyright © 2016 Google. All rights reserved.
+//
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+
+@end
+
+@implementation AppDelegate
+
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  // Override point for customization after application launch.
+  return YES;
+}
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+  // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
+  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+}
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+  // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
+}
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+}
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+}
+
+@end
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/Assets.xcassets/AppIcon.appiconset/Contents.json b/src/objective-c/tests/End2EndTest/End2EndTest/Assets.xcassets/AppIcon.appiconset/Contents.json
new file mode 100644
index 0000000000..118c98f746
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,38 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/LaunchScreen.storyboard b/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/LaunchScreen.storyboard
new file mode 100644
index 0000000000..2e721e1833
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
+                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <animations/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/Main.storyboard b/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/Main.storyboard
new file mode 100644
index 0000000000..f56d2f3bb5
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/Base.lproj/Main.storyboard
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/Info.plist b/src/objective-c/tests/End2EndTest/End2EndTest/Info.plist
new file mode 100644
index 0000000000..6905cc67bb
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/Info.plist
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.h b/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.h
new file mode 100644
index 0000000000..941477a48c
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.h
@@ -0,0 +1,15 @@
+//
+//  ViewController.h
+//  End2EndTest
+//
+//  Created by mxyan on 7/11/16.
+//  Copyright © 2016 Google. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+
+@end
+
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.m b/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.m
new file mode 100644
index 0000000000..535e40bcb3
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/ViewController.m
@@ -0,0 +1,27 @@
+//
+//  ViewController.m
+//  End2EndTest
+//
+//  Created by mxyan on 7/11/16.
+//  Copyright © 2016 Google. All rights reserved.
+//
+
+#import "ViewController.h"
+
+@interface ViewController ()
+
+@end
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  // Do any additional setup after loading the view, typically from a nib.
+}
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+  // Dispose of any resources that can be recreated.
+}
+
+@end
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/h2_ssl.m b/src/objective-c/tests/End2EndTest/End2EndTest/h2_ssl.m
new file mode 100644
index 0000000000..2649546fca
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/h2_ssl.m
@@ -0,0 +1,199 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/core/end2end/end2end_tests.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/host_port.h>
+#include <grpc/support/log.h>
+
+#include "src/core/lib/channel/channel_args.h"
+#include "src/core/lib/security/credentials/credentials.h"
+#include "src/core/lib/support/env.h"
+#include "src/core/lib/support/string.h"
+#include "src/core/lib/support/tmpfile.h"
+#include "test/core/end2end/data/ssl_test_data.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+
+#include <grpc/grpc_cronet.h>
+#import <Cronet/Cronet.h>
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+typedef struct fullstack_secure_fixture_data {
+  char *localaddr;
+} fullstack_secure_fixture_data;
+
+static grpc_end2end_test_fixture chttp2_create_fixture_secure_fullstack(
+    grpc_channel_args *client_args, grpc_channel_args *server_args) {
+  grpc_end2end_test_fixture f;
+  int port = grpc_pick_unused_port_or_die();
+  fullstack_secure_fixture_data *ffd =
+      gpr_malloc(sizeof(fullstack_secure_fixture_data));
+  memset(&f, 0, sizeof(f));
+
+  gpr_join_host_port(&ffd->localaddr, "localhost", port);
+
+  f.fixture_data = ffd;
+  f.cq = grpc_completion_queue_create(NULL);
+
+  return f;
+}
+
+static void process_auth_failure(void *state, grpc_auth_context *ctx,
+                                 const grpc_metadata *md, size_t md_count,
+                                 grpc_process_auth_metadata_done_cb cb,
+                                 void *user_data) {
+  GPR_ASSERT(state == NULL);
+  cb(user_data, NULL, 0, NULL, 0, GRPC_STATUS_UNAUTHENTICATED, NULL);
+}
+
+static void chttp2_init_client_secure_fullstack(
+    grpc_end2end_test_fixture *f, grpc_channel_args *client_args,
+    cronet_engine *cronetEngine) {
+  fullstack_secure_fixture_data *ffd = f->fixture_data;
+  f->client =
+      grpc_cronet_secure_channel_create(cronetEngine, ffd->localaddr, client_args, NULL);
+  GPR_ASSERT(f->client != NULL);
+}
+
+static void chttp2_init_server_secure_fullstack(
+    grpc_end2end_test_fixture *f, grpc_channel_args *server_args,
+    grpc_server_credentials *server_creds) {
+  fullstack_secure_fixture_data *ffd = f->fixture_data;
+  if (f->server) {
+    grpc_server_destroy(f->server);
+  }
+  f->server = grpc_server_create(server_args, NULL);
+  grpc_server_register_completion_queue(f->server, f->cq, NULL);
+  GPR_ASSERT(grpc_server_add_secure_http2_port(f->server, ffd->localaddr,
+                                               server_creds));
+  grpc_server_credentials_release(server_creds);
+  grpc_server_start(f->server);
+}
+
+void chttp2_tear_down_secure_fullstack(grpc_end2end_test_fixture *f) {
+  fullstack_secure_fixture_data *ffd = f->fixture_data;
+  gpr_free(ffd->localaddr);
+  gpr_free(ffd);
+}
+
+static void chttp2_init_client_simple_ssl_secure_fullstack(
+    grpc_end2end_test_fixture *f, grpc_channel_args *client_args) {
+  grpc_arg ssl_name_override = {GRPC_ARG_STRING,
+                                GRPC_SSL_TARGET_NAME_OVERRIDE_ARG,
+                                {"foo.test.google.fr"}};
+  
+  grpc_channel_args *new_client_args =
+      grpc_channel_args_copy_and_add(client_args, &ssl_name_override, 1);
+  [Cronet setHttp2Enabled:YES];
+  [Cronet start];
+  cronet_engine *cronetEngine = [Cronet getGlobalEngine];
+  
+  chttp2_init_client_secure_fullstack(f, new_client_args, cronetEngine);
+  grpc_channel_args_destroy(new_client_args);
+}
+
+static int fail_server_auth_check(grpc_channel_args *server_args) {
+  size_t i;
+  if (server_args == NULL) return 0;
+  for (i = 0; i < server_args->num_args; i++) {
+    if (strcmp(server_args->args[i].key, FAIL_AUTH_CHECK_SERVER_ARG_NAME) ==
+        0) {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+static void chttp2_init_server_simple_ssl_secure_fullstack(
+    grpc_end2end_test_fixture *f, grpc_channel_args *server_args) {
+  grpc_ssl_pem_key_cert_pair pem_cert_key_pair = {test_server1_key,
+                                                  test_server1_cert};
+  grpc_server_credentials *ssl_creds =
+      grpc_ssl_server_credentials_create(NULL, &pem_cert_key_pair, 1, 0, NULL);
+  if (fail_server_auth_check(server_args)) {
+    grpc_auth_metadata_processor processor = {process_auth_failure, NULL, NULL};
+    grpc_server_credentials_set_auth_metadata_processor(ssl_creds, processor);
+  }
+  chttp2_init_server_secure_fullstack(f, server_args, ssl_creds);
+}
+
+/* All test configurations */
+
+static grpc_end2end_test_config configs[] = {
+    {"chttp2/simple_ssl_fullstack",
+     FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION |
+         FEATURE_MASK_SUPPORTS_PER_CALL_CREDENTIALS,
+     chttp2_create_fixture_secure_fullstack,
+     chttp2_init_client_simple_ssl_secure_fullstack,
+     chttp2_init_server_simple_ssl_secure_fullstack,
+     chttp2_tear_down_secure_fullstack},
+};
+
+int main(int argc, char **argv) {
+  size_t i;
+  FILE *roots_file;
+  size_t roots_size = strlen(test_root_cert);
+  char *roots_filename;
+
+  grpc_test_init(argc, argv);
+  grpc_end2end_tests_pre_init();
+
+  /* Set the SSL roots env var. */
+  roots_file = gpr_tmpfile("chttp2_simple_ssl_fullstack_test", &roots_filename);
+  GPR_ASSERT(roots_filename != NULL);
+  GPR_ASSERT(roots_file != NULL);
+  GPR_ASSERT(fwrite(test_root_cert, 1, roots_size, roots_file) == roots_size);
+  fclose(roots_file);
+  gpr_setenv(GRPC_DEFAULT_SSL_ROOTS_FILE_PATH_ENV_VAR, roots_filename);
+
+  grpc_init();
+
+  for (i = 0; i < sizeof(configs) / sizeof(*configs); i++) {
+    grpc_end2end_tests(argc, argv, configs[i]);
+  }
+
+  grpc_shutdown();
+
+  /* Cleanup. */
+  remove(roots_filename);
+  gpr_free(roots_filename);
+
+  return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+}
diff --git a/src/objective-c/tests/End2EndTest/End2EndTest/main.m b/src/objective-c/tests/End2EndTest/End2EndTest/main.m
new file mode 100644
index 0000000000..a1894cdb41
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/End2EndTest/main.m
@@ -0,0 +1,16 @@
+//
+//  main.m
+//  End2EndTest
+//
+//  Created by mxyan on 7/11/16.
+//  Copyright © 2016 Google. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
diff --git a/src/objective-c/tests/End2EndTest/Podfile b/src/objective-c/tests/End2EndTest/Podfile
new file mode 100644
index 0000000000..59b64badfb
--- /dev/null
+++ b/src/objective-c/tests/End2EndTest/Podfile
@@ -0,0 +1,83 @@
+source 'https://github.com/CocoaPods/Specs.git'
+platform :ios, '8.0'
+
+install! 'cocoapods', :deterministic_uuids => false
+
+# Location of gRPC's repo root relative to this file.
+GRPC_LOCAL_SRC = '../../../..'
+
+# Install the dependencies in the main target plus all test targets.
+%w(
+  End2EndTest
+).each do |target_name|
+  target target_name do
+    pod 'BoringSSL', :podspec => "#{GRPC_LOCAL_SRC}/src/objective-c", :inhibit_warnings => true
+    pod 'CronetFramework', :podspec => "#{GRPC_LOCAL_SRC}/src/objective-c"
+    pod 'gRPC-Core', :path => GRPC_LOCAL_SRC
+    pod 'gRPC-Cronet', :path => GRPC_LOCAL_SRC
+  end
+end
+
+# gRPC-Core.podspec needs to be modified to be successfully used for local development. A Podfile's
+# pre_install hook lets us do that. The block passed to it runs after the podspecs are downloaded
+# and before they are installed in the user project.
+#
+# This podspec searches for the gRPC core library headers under "$(PODS_ROOT)/gRPC-Core", where
+# Cocoapods normally places the downloaded sources. When doing local development of the libraries,
+# though, Cocoapods just takes the sources from whatever directory was specified using `:path`, and
+# doesn't copy them under $(PODS_ROOT). When using static libraries, one can sometimes rely on the
+# symbolic links to the pods headers that Cocoapods creates under "$(PODS_ROOT)/Headers". But those
+# aren't created when using dynamic frameworks. So our solution is to modify the podspec on the fly
+# to point at the local directory where the sources are.
+#
+# TODO(jcanizales): Send a PR to Cocoapods to get rid of this need.
+pre_install do |installer|
+  # This is the gRPC-Core podspec object, as initialized by its podspec file.
+  grpc_core_spec = installer.pod_targets.find{|t| t.name == 'gRPC-Core'}.root_spec
+
+  # Copied from gRPC-Core.podspec, except for the adjusted src_root:
+  src_root = "$(PODS_ROOT)/../#{GRPC_LOCAL_SRC}"
+  grpc_core_spec.pod_target_xcconfig = {
+    'GRPC_SRC_ROOT' => src_root,
+    'HEADER_SEARCH_PATHS' => '"$(inherited)" "$(GRPC_SRC_ROOT)/include"',
+    'USER_HEADER_SEARCH_PATHS' => '"$(GRPC_SRC_ROOT)"',
+    # If we don't set these two settings, `include/grpc/support/time.h` and
+    # `src/core/lib/support/string.h` shadow the system `<time.h>` and `<string.h>`, breaking the
+    # build.
+    'USE_HEADERMAP' => 'NO',
+    'ALWAYS_SEARCH_USER_PATHS' => 'NO',
+  }
+
+# This is the gRPC-Core podspec object, as initialized by its podspec file.
+  grpc_core_spec = installer.pod_targets.find{|t| t.name == 'gRPC-Cronet'}.root_spec
+  
+  # Copied from gRPC-Core.podspec, except for the adjusted src_root:
+  src_root = "$(PODS_ROOT)/../#{GRPC_LOCAL_SRC}"
+  grpc_core_spec.pod_target_xcconfig = {
+    'GRPC_SRC_ROOT' => src_root,
+    'HEADER_SEARCH_PATHS' => '"$(inherited)" "$(GRPC_SRC_ROOT)/include"',
+    'USER_HEADER_SEARCH_PATHS' => '"$(GRPC_SRC_ROOT)"',
+    # If we don't set these two settings, `include/grpc/support/time.h` and
+    # `src/core/lib/support/string.h` shadow the system `<time.h>` and `<string.h>`, breaking the
+    # build.
+    'USE_HEADERMAP' => 'NO',
+    'ALWAYS_SEARCH_USER_PATHS' => 'NO',
+  }
+
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    target.build_configurations.each do |config|
+      config.build_settings['GCC_TREAT_WARNINGS_AS_ERRORS'] = 'YES'
+    end
+    if target.name == 'gRPC-Core'
+      target.build_configurations.each do |config|
+        # TODO(zyc) Remove this setting after the issue is resolved
+        # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
+        # function" warning
+        config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+      end
+    end
+  end
+end