Add caching interceptor example

pull/18852/head
Muxi Yan 6 years ago
parent 4eca064dcc
commit 6fccb70f0d
  1. 421
      src/objective-c/examples/InterceptorSample/InterceptorSample.xcodeproj/project.pbxproj
  2. 25
      src/objective-c/examples/InterceptorSample/InterceptorSample/AppDelegate.h
  3. 5
      src/objective-c/examples/InterceptorSample/InterceptorSample/AppDelegate.m
  4. 98
      src/objective-c/examples/InterceptorSample/InterceptorSample/Assets.xcassets/AppIcon.appiconset/Contents.json
  5. 6
      src/objective-c/examples/InterceptorSample/InterceptorSample/Assets.xcassets/Contents.json
  6. 25
      src/objective-c/examples/InterceptorSample/InterceptorSample/Base.lproj/LaunchScreen.storyboard
  7. 38
      src/objective-c/examples/InterceptorSample/InterceptorSample/Base.lproj/Main.storyboard
  8. 90
      src/objective-c/examples/InterceptorSample/InterceptorSample/CacheInterceptor.h
  9. 303
      src/objective-c/examples/InterceptorSample/InterceptorSample/CacheInterceptor.m
  10. 45
      src/objective-c/examples/InterceptorSample/InterceptorSample/Info.plist
  11. 25
      src/objective-c/examples/InterceptorSample/InterceptorSample/ViewController.h
  12. 86
      src/objective-c/examples/InterceptorSample/InterceptorSample/ViewController.m
  13. 26
      src/objective-c/examples/InterceptorSample/InterceptorSample/main.m
  14. 31
      src/objective-c/examples/InterceptorSample/Podfile

@ -0,0 +1,421 @@
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@ -0,0 +1,25 @@
/*
*
* 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.
*
*/
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end

@ -0,0 +1,5 @@
#import "AppDelegate.h"
@implementation AppDelegate
@end

@ -0,0 +1,98 @@
{
"images" : [
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"idiom" : "iphone",
"size" : "20x20",
"scale" : "2x"
},
{
"idiom" : "iphone",
"size" : "20x20",
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},
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{
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"size" : "83.5x83.5",
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},
{
"idiom" : "ios-marketing",
"size" : "1024x1024",
"scale" : "1x"
}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
}

@ -0,0 +1,25 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
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<scenes>
<!--View Controller-->
<scene sceneID="EHf-IW-A2E">
<objects>
<viewController id="01J-lp-oVM" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
</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>

@ -0,0 +1,38 @@
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="XDI-qX-FfC">
<rect key="frame" x="172" y="182" width="30" height="30"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<state key="normal" title="Call"/>
<connections>
<action selector="tapCall:" destination="BYZ-38-t0r" eventType="touchUpInside" id="qEz-Hb-ReK"/>
</connections>
</button>
</subviews>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
</scene>
</scenes>
</document>

@ -0,0 +1,90 @@
/*
*
* 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.
*
*/
#import <GRPCClient/GRPCInterceptor.h>
NS_ASSUME_NONNULL_BEGIN
@interface RequestCacheEntry : NSObject<NSCopying>
@property(readonly, copy, nullable) NSString *path;
@property(readonly, copy, nullable) id message;
@end
@interface MutableRequestCacheEntry : RequestCacheEntry
@property(copy, nullable) NSString *path;
@property(copy, nullable) id<NSObject> message;
@end
@interface ResponseCacheEntry : NSObject<NSCopying>
@property(readonly, copy, nullable) NSDate *deadline;
@property(readonly, copy, nullable) NSDictionary *headers;
@property(readonly, copy, nullable) id message;
@property(readonly, copy, nullable) NSDictionary *trailers;
@end
@interface MutableResponseCacheEntry : ResponseCacheEntry
@property(copy, nullable) NSDate *deadline;
@property(copy, nullable) NSDictionary *headers;
@property(copy, nullable) id message;
@property(copy, nullable) NSDictionary *trailers;
@end
@interface CacheContext : NSObject<GRPCInterceptorFactory>
- (nullable instancetype)init;
- (nullable ResponseCacheEntry *)getCachedResponseForRequest:(RequestCacheEntry *)request;
- (void)setCachedResponse:(ResponseCacheEntry *)response forRequest:(RequestCacheEntry *)request;
@end
@interface CacheInterceptor : GRPCInterceptor
- (instancetype)init NS_UNAVAILABLE;
+ (instancetype)new NS_UNAVAILABLE;
- (nullable instancetype)initWithInterceptorManager:(GRPCInterceptorManager * _Nonnull)intercepterManager
cacheContext:(CacheContext * _Nonnull)cacheContext NS_DESIGNATED_INITIALIZER;
// implementation of GRPCInterceptorInterface
- (void)startWithRequestOptions:(GRPCRequestOptions *)requestOptions
callOptions:(GRPCCallOptions *)callOptions;
- (void)writeData:(id)data;
- (void)finish;
// implementation of GRPCResponseHandler
- (void)didReceiveInitialMetadata:(nullable NSDictionary *)initialMetadata;
- (void)didReceiveData:(id)data;
- (void)didCloseWithTrailingMetadata:(nullable NSDictionary *)trailingMetadata
error:(nullable NSError *)error;
@end
NS_ASSUME_NONNULL_END

@ -0,0 +1,303 @@
/*
*
* 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.
*
*/
#import "CacheInterceptor.h"
@implementation RequestCacheEntry {
@protected
NSString *_path;
id<NSObject> _message;
}
@synthesize path = _path;
@synthesize message = _message;
- (instancetype)initWithPath:(NSString *)path message:(id)message {
if ((self = [super init])) {
_path = [path copy];
_message = [message copy];
}
return self;
}
- (id)copyWithZone:(NSZone *)zone {
return [[RequestCacheEntry allocWithZone:zone] initWithPath:_path message:_message];
}
- (BOOL)isEqual:(id)object {
if ([self class] != [object class]) return NO;
RequestCacheEntry *rhs = (RequestCacheEntry *)object;
return ([_path isEqualToString:rhs.path] && [_message isEqual:rhs.message]);
}
- (NSUInteger)hash {
return _path.hash ^ _message.hash;
}
@end
@implementation MutableRequestCacheEntry
@dynamic path;
@dynamic message;
- (void)setPath:(NSString *)path {
_path = [path copy];
}
- (void)setMessage:(id)message {
_message = [message copy];
}
@end
@implementation ResponseCacheEntry {
@protected
NSDate *_deadline;
NSDictionary *_headers;
id _message;
NSDictionary *_trailers;
}
@synthesize deadline = _deadline;
@synthesize headers = _headers;
@synthesize message = _message;
@synthesize trailers = _trailers;
- (instancetype)initWithDeadline:(NSDate *)deadline
headers:(NSDictionary *)headers
message:(id)message
trailers:(NSDictionary *)trailers {
if (([super init])) {
_deadline = [deadline copy];
_headers = [[NSDictionary alloc] initWithDictionary:headers copyItems:YES];
_message = [message copy];
_trailers = [[NSDictionary alloc] initWithDictionary:trailers copyItems:YES];
}
return self;
}
- (id)copyWithZone:(NSZone *)zone {
return [[ResponseCacheEntry allocWithZone:zone] initWithDeadline:_deadline
headers:_headers
message:_message
trailers:_trailers];
}
@end
@implementation MutableResponseCacheEntry
@dynamic deadline;
@dynamic headers;
@dynamic message;
@dynamic trailers;
- (void)setDeadline:(NSDate *)deadline {
_deadline = [deadline copy];
}
- (void)setHeaders:(NSDictionary *)headers {
_headers = [[NSDictionary alloc] initWithDictionary:headers copyItems:YES];
}
- (void)setMessage:(id)message {
_message = [message copy];
}
- (void)setTrailers:(NSDictionary *)trailers {
_trailers = [[NSDictionary alloc] initWithDictionary:trailers copyItems:YES];
}
@end
@implementation CacheContext {
NSCache<RequestCacheEntry *, ResponseCacheEntry *> *_cache;
}
- (instancetype)init {
if ((self = [super init])) {
_cache = [[NSCache alloc] init];
}
return self;
}
- (GRPCInterceptor *)createInterceptorWithManager:(GRPCInterceptorManager *)interceptorManager {
return [[CacheInterceptor alloc] initWithInterceptorManager:interceptorManager
cacheContext:self];
}
- (ResponseCacheEntry *)getCachedResponseForRequest:(RequestCacheEntry *)request {
ResponseCacheEntry *response = nil;
@synchronized (self) {
response = [_cache objectForKey:request];
}
return response;
}
- (void)setCachedResponse:(ResponseCacheEntry *)response
forRequest:(RequestCacheEntry *)request {
@synchronized (self) {
[_cache setObject:response forKey:request];
}
}
@end
@implementation CacheInterceptor {
GRPCInterceptorManager *_manager;
CacheContext *_context;
dispatch_queue_t _dispatchQueue;
BOOL _cacheable;
BOOL _messageSeen;
GRPCCallOptions *_callOptions;
GRPCRequestOptions *_requestOptions;
id _requestMessage;
MutableRequestCacheEntry *_request;
MutableResponseCacheEntry *_response;
}
- (dispatch_queue_t)requestDispatchQueue {
return _dispatchQueue;
}
- (dispatch_queue_t)dispatchQueue {
return _dispatchQueue;
}
- (instancetype)initWithInterceptorManager:(GRPCInterceptorManager * _Nonnull)intercepterManager
cacheContext:(CacheContext * _Nonnull)cacheContext {
if ((self = [super initWithInterceptorManager:intercepterManager
requestDispatchQueue:dispatch_get_main_queue()
responseDispatchQueue:dispatch_get_main_queue()])) {
_manager = intercepterManager;
_context = cacheContext;
_dispatchQueue = dispatch_queue_create(NULL, DISPATCH_QUEUE_SERIAL);
_cacheable = YES;
_messageSeen = NO;
_request = nil;
_response = nil;
}
return self;
}
- (void)startWithRequestOptions:(GRPCRequestOptions *)requestOptions callOptions:(GRPCCallOptions *)callOptions {
NSLog(@"start");
if (requestOptions.safety != GRPCCallSafetyCacheableRequest) {
NSLog(@"no cache");
_cacheable = NO;
[_manager startNextInterceptorWithRequest:requestOptions callOptions:callOptions];
} else {
_requestOptions = [requestOptions copy];
_callOptions = [callOptions copy];
}
}
- (void)writeData:(id)data {
NSLog(@"writeData");
if (!_cacheable) {
[_manager writeNextInterceptorWithData:data];
} else {
NSAssert(!_messageSeen, @"CacheInterceptor does not support streaming call");
if (_messageSeen) {
NSLog(@"CacheInterceptor does not support streaming call");
}
_messageSeen = YES;
_requestMessage = [data copy];
}
}
- (void)finish {
NSLog(@"finish");
if (!_cacheable) {
[_manager finishNextInterceptor];
} else {
_request = [[MutableRequestCacheEntry alloc] init];
_request.path = _requestOptions.path;
_request.message = [_requestMessage copy];
_response = [[_context getCachedResponseForRequest:_request] copy];
NSLog(@"Read cache for %@", _request);
if (!_response) {
[_manager startNextInterceptorWithRequest:_requestOptions
callOptions:_callOptions];
[_manager writeNextInterceptorWithData:_requestMessage];
[_manager finishNextInterceptor];
} else {
[_manager forwardPreviousInterceptorWithInitialMetadata:_response.headers];
[_manager forwardPreviousIntercetporWithData:_response.message];
[_manager forwardPreviousInterceptorCloseWithTrailingMetadata:_response.trailers error:nil];
[_manager shutDown];
}
}
}
- (void)didReceiveInitialMetadata:(NSDictionary *)initialMetadata {
NSLog(@"initialMetadata");
if (_cacheable) {
NSDate *deadline = nil;
for (NSString *key in initialMetadata) {
if ([key.lowercaseString isEqualToString:@"cache-control"]) {
NSArray *cacheControls = [initialMetadata[key] componentsSeparatedByString:@","];
for (NSString *option in cacheControls) {
NSString *trimmedOption = [option stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@" "]];
if ([trimmedOption.lowercaseString isEqualToString:@"no-cache"] ||
[trimmedOption.lowercaseString isEqualToString:@"no-store"] ||
[trimmedOption.lowercaseString isEqualToString:@"no-transform"]) {
_cacheable = NO;
break;
} else if ([trimmedOption.lowercaseString hasPrefix:@"max-age="]) {
NSArray<NSString *> *components = [trimmedOption componentsSeparatedByString:@"="];
if (components.count == 2) {
NSUInteger maxAge = components[1].intValue;
deadline = [NSDate dateWithTimeIntervalSinceNow:maxAge];
}
}
}
}
}
if (_cacheable) {
_response = [[MutableResponseCacheEntry alloc] init];
_response.headers = [initialMetadata copy];
_response.deadline = deadline;
}
}
[_manager forwardPreviousInterceptorWithInitialMetadata:initialMetadata];
}
- (void)didReceiveData:(id)data {
NSLog(@"receiveData");
if (_cacheable) {
_response.message = [data copy];
}
[_manager forwardPreviousIntercetporWithData:data];
}
- (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
NSLog(@"close");
if (error == nil && _cacheable) {
_response.trailers = [trailingMetadata copy];
[_context setCachedResponse:_response forRequest:_request];
NSLog(@"Write cache for %@", _request);
}
[_manager forwardPreviousInterceptorCloseWithTrailingMetadata:trailingMetadata error:error];
[_manager shutDown];
}
@end

@ -0,0 +1,45 @@
<?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>$(DEVELOPMENT_LANGUAGE)</string>
<key>CFBundleExecutable</key>
<string>$(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>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>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationPortraitUpsideDown</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
</dict>
</plist>

@ -0,0 +1,25 @@
/*
*
* 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.
*
*/
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@end

@ -0,0 +1,86 @@
/*
*
* 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.
*
*/
#import "ViewController.h"
#import <GRPCClient/GRPCCall.h>
#import <RemoteTest/Test.pbrpc.h>
#import <RemoteTest/Messages.pbobjc.h>
#import "CacheInterceptor.h"
static NSString *const kPackage = @"grpc.testing";
static NSString *const kService = @"TestService";
@interface ViewController ()<GRPCResponseHandler>
@end
@implementation ViewController {
GRPCCallOptions *_options;
}
- (void)viewDidLoad {
[super viewDidLoad];
GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
id<GRPCInterceptorFactory> factory = [[CacheContext alloc] init];
options.interceptorFactories = @[ factory ];
_options = options;
}
- (IBAction)tapCall:(id)sender {
GRPCProtoMethod *kUnaryCallMethod =
[[GRPCProtoMethod alloc] initWithPackage:kPackage service:kService method:@"UnaryCall"];
GRPCRequestOptions *requestOptions =
[[GRPCRequestOptions alloc] initWithHost:@"grpc-test.sandbox.googleapis.com"
path:kUnaryCallMethod.HTTPPath
safety:GRPCCallSafetyCacheableRequest];
GRPCCall2 *call = [[GRPCCall2 alloc] initWithRequestOptions:requestOptions
responseHandler:self
callOptions:_options];
RMTSimpleRequest *request = [RMTSimpleRequest message];
request.responseSize = 100;
[call start];
[call writeData:[request data]];
[call finish];
}
- (dispatch_queue_t)dispatchQueue {
return dispatch_get_main_queue();
}
- (void)didReceiveInitialMetadata:(NSDictionary *)initialMetadata {
NSLog(@"Header: %@", initialMetadata);
}
- (void)didReceiveData:(id)data {
NSLog(@"Message: %@", data);
}
- (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
NSLog(@"Trailer: %@\nError: %@", trailingMetadata, error);
}
@end

@ -0,0 +1,26 @@
/*
*
* 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.
*
*/
#import <UIKit/UIKit.h>
#import "AppDelegate.h"
int main(int argc, char * argv[]) {
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}

@ -0,0 +1,31 @@
platform :ios, '8.0'
install! 'cocoapods', :deterministic_uuids => false
ROOT_DIR = '../../../..'
target 'InterceptorSample' do
pod 'gRPC-ProtoRPC', :path => ROOT_DIR
pod 'gRPC', :path => ROOT_DIR
pod 'gRPC-Core', :path => ROOT_DIR
pod 'gRPC-RxLibrary', :path => ROOT_DIR
pod 'RemoteTest', :path => "../RemoteTestClient"
pod '!ProtoCompiler-gRPCPlugin', :path => "#{ROOT_DIR}/src/objective-c"
end
pre_install do |installer|
grpc_core_spec = installer.pod_targets.find{|t| t.name.start_with?('gRPC-Core')}.root_spec
src_root = "$(PODS_TARGET_SRCROOT)"
grpc_core_spec.pod_target_xcconfig = {
'GRPC_SRC_ROOT' => src_root,
'HEADER_SEARCH_PATHS' => '"$(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/gpr/string.h` shadow the system `<time.h>` and `<string.h>`, breaking the
# build.
'USE_HEADERMAP' => 'NO',
'ALWAYS_SEARCH_USER_PATHS' => 'NO',
}
end
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