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Effective Network Programming with iOS 7 Wednesday, October 9, 13

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Ben Scheirman CFOTDIFJSNBODPN !TVCEJHJUBM • Director

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Wednesday, October 9, 13

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Bite-sized Screencasts .com Weekly

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Why is this important? 99%

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Why is this important? Doing

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Why is this important? Too

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Exhibit A: Stuttery Scroller Wednesday, October 9, 13

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Exhibit A: Stuttery Scroller Accessing

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Exhibit B: The Perpetual Loader Wednesday, October 9, 13

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Exhibit B: The Perpetual Loader How

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Exhibit C: Slow Loader Wednesday, October 9, 13

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Exhibit C: Slow Loader Loading

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Exhibit D: Yesterday’s News Wednesday, October 9, 13

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Exhibit D: Yesterday’s News Caching

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What we’ll cover w /463-4FTTJPO#BTJDT w -*7&$0%*/( XJTINFMVDL w "'/FUXPSLJOH w )551$BDIJOH w $BDIJOH1BUUFSOT w "1*%FTJHO5JQT Wednesday, October 9, 13

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NSURLConnection Invented for Safari ~2000, made public in 2003 Poor separation of settings, config, cache Now replaced by NSURLSession classes Wednesday, October 9, 13

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NSURLConnection Invented for Safari ~2000, made public in 2003 Poor separation of settings, config, cache Now replaced by NSURLSession classes Wednesday, October 9, 13

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NSURLSession Still use NSURLRequest Configurable Container (isolation w/ 3rd party libraries) Improved auth Rich Callbacks Wednesday, October 9, 13

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NSURLSession Wednesday, October 9, 13

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NSURLSession Wednesday, October 9, 13

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NSURLSession Wednesday, October 9, 13

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NSURLSession Class Family NSURLSessionConfiguration NSURLSessionTask NSURLSessionDelegate NSURLSession Wednesday, October 9, 13

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NSURLSession NSURLSession Interface for issuing network calls against a server Likely use case: 1 session per API Wednesday, October 9, 13

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NSURLSessionDelegate Delegate methods for a session: Used for connect level authentication challenges NTLM, Kerberos, Client certificates - URLSession:didBecomeInvalidWithError: - URLSession:didReceiveChallenge:completionHandler: Wednesday, October 9, 13

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NSURLSessionTask Wednesday, October 9, 13

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NSURLSessionTaskDelegate Delegate methods for a request: Only need to implement for fine-grained control - URLSession:task:willPerformHTTPRedirection:newRequest:completionHandler: - URLSession:task:didReceiveChallenge:completionHandler: - URLSession:task:needNewBodyStream: - URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend: - URLSession:task:didCompleteWithError: Wednesday, October 9, 13

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NSURLSessionDataTaskDelegate Delegate methods for a data request: Only need to implement for fine-grained control - URLSession:dataTask:didReceiveChallenge:completionHandler: - URLSession:dataTask:didBecomeDownloadTask: - URLSession:dataTask:didReceiveData: - URLSession:dataTask:willCacheResponse:completionHandler: Wednesday, October 9, 13

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NSURLSessionDownloadDelegate - URLSession:downloadTask:didFinishDownloadingToURL: -URLSession:downloadTask:didWriteData:totalBytesWritten:totalBytesExpectedToWrite: - URLSession:downloadTask:didResumeAtOffset:expectedTotalBytes: Wednesday, October 9, 13

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Requesting Images Wednesday, October 9, 13

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/kwpjYwQ.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; Wednesday, October 9, 13

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/kwpjYwQ.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; WRONG Wednesday, October 9, 13

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/kwpjYwQ.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; Wednesday, October 9, 13

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In case you were wondering... Wednesday, October 9, 13

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Demo •Demo: Download an image with NSURLSessionDownloadTask Wednesday, October 9, 13

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NSURLSessionDataTask •Represents GET/PUT/POST/DELETE •Handle completion callback •If error is present, request failed Wednesday, October 9, 13

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What constitutes an error? • Connection failed • Timeouts • Host invalid • Bad URL • Too many redirects • ... dozens more (check URL Loading System Error Codes) Wednesday, October 9, 13

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Demo •Demo: Searching the iTunes Store Wednesday, October 9, 13

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AFNetworking Wednesday, October 9, 13

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AFNetworking 2.0 Wednesday, October 9, 13

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Installation gem install cocoapods Podfile pod install platform :ios, "7.0" pod 'AFNetworking', '2.0' Wednesday, October 9, 13

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Installation gem install cocoapods Podfile pod install platform :ios, "7.0" pod 'AFNetworking', '2.0' Wednesday, October 9, 13

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Installation Podfile pod install platform :ios, "7.0" pod 'AFNetworking', '2.0' gem install cocoapods Wednesday, October 9, 13

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Installation Podfile pod install platform :ios, "6.0" pod 'AFNetworking' platform :ios, "7.0" pod 'AFNetworking', '2.0' gem install cocoapods Wednesday, October 9, 13

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AFNetworking 1.0 Design AFHTTPRequestOperation NSOperation AFURLConnectionOperation NSURLRequest NSURLConnection Wednesday, October 9, 13

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AFNetworking 2.0 Design AFHTTPSessionManager NSObject AFURLSessionManager NSURLSession NSURLSessionConfiguration NSURLSessionTask Wednesday, October 9, 13

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Serializers AFJSONSerializer AFURLSessionManager Wednesday, October 9, 13

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Usage Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, id responseObject) { Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, id responseObject) { // handle success Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, id responseObject) { // handle success } failure:^(NSURLSessionDataTask *task, NSError *error) { Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, id responseObject) { // handle success } failure:^(NSURLSessionDataTask *task, NSError *error) { // handle failure Wednesday, October 9, 13

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultConfiguration]; AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config]; manager.responseSerializer = [[AFJSONSerializer alloc] init]; [manager GET:url parameters:nil completion:^(NSURLSessionDataTask *task, id responseObject) { // handle success } failure:^(NSURLSessionDataTask *task, NSError *error) { // handle failure }]; Wednesday, October 9, 13

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Requesting Images Wednesday, October 9, 13

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: Wednesday, October 9, 13

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/kwpjYwQ.jpg”]; Wednesday, October 9, 13

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/kwpjYwQ.jpg”]; [imageView setImageWithURL:imageUrl]; Wednesday, October 9, 13

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Requesting XML? Wednesday, October 9, 13

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Requesting XML? AFXMLResponseSerializer Wednesday, October 9, 13

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Requesting plist? Wednesday, October 9, 13

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Requesting plist? AFPropertyListResponseSerializer Wednesday, October 9, 13

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Requesting a custom data format? Wednesday, October 9, 13

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Requesting a custom data format? MyCustomResponseSerializer Wednesday, October 9, 13

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Demo: app.net client Wednesday, October 9, 13

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Other AFNetworking Goodies AFHTTPSessionManager setSecurityPolicy [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModePublicKey] Wednesday, October 9, 13

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Other AFNetworking Goodies UIActivityIndicatorView+AFNetworking.h [indicator setAnimatingWithStateOfTask:task] Wednesday, October 9, 13

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HTTP Status Code Cheat Sheet 1xx - Not Used 2xx - Thumbs Up 3xx - It's over there 4xx - You messed up 5xx - We messed up Wednesday, October 9, 13

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HTTP Caching Client Server Wednesday, October 9, 13

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HTTP Caching Client Server GET /customer/152.json HTTP 1.1 Host: example.com Wednesday, October 9, 13

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HTTP Caching Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 37142 Etag:“e6482391249374127ca94128” Cache-Control:max-age=60, public Date:Sun, 21 Oct 2012 16:15:37 GET /customer/152.json HTTP 1.1 Host: example.com Wednesday, October 9, 13

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HTTP Caching GET /customer/152.json HTTP 1.1 Host: example.com Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 37142 Etag:“e6482391249374127ca94128” Cache-Control:max-age=60, public Date:Sun, 21 Oct 2012 16:15:37 Wednesday, October 9, 13

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HTTP Caching GET /customer/152.json HTTP 1.1 Host: example.com Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 37142 Etag:“e6482391249374127ca94128” Cache-Control:max-age=60, public Date:Sun, 21 Oct 2012 16:15:37 Wednesday, October 9, 13

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HTTP Caching GET /customer/152.json HTTP 1.1 Host: example.com Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 37142 Etag:“e6482391249374127ca94128” Cache-Control:max-age=60, public Date:Sun, 21 Oct 2012 16:15:37 Wednesday, October 9, 13

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Leveraging Etag on the client Client Server Wednesday, October 9, 13

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Leveraging Etag on the client GET /customer/152.json HTTP 1.1 Host: example.com If-None-Match:“e6482391249374127ca94128” Client Server Wednesday, October 9, 13

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Leveraging Etag on the client GET /customer/152.json HTTP 1.1 Host: example.com If-None-Match:“e6482391249374127ca94128” Client Server HTTP/1.1 304 Not Modified < no response body > Wednesday, October 9, 13

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Leveraging Modified Date Client Server Wednesday, October 9, 13

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Leveraging Modified Date GET /customer/152.json HTTP 1.1 Host: example.com If-Modified-Since: Client Server Wednesday, October 9, 13

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Leveraging Modified Date GET /customer/152.json HTTP 1.1 Host: example.com If-Modified-Since: Client Server HTTP/1.1 304 Not Modified < no response body > Wednesday, October 9, 13

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Etag/Last Modified on the Server Wednesday, October 9, 13

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Etag/Last Modified on the Server def show Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, :last_modified => @band, Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, :last_modified => @band, :public => true) Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, :last_modified => @band, :public => true) expires_in 10.minutes, :public => true Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, :last_modified => @band, :public => true) expires_in 10.minutes, :public => true end Wednesday, October 9, 13

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Etag/Last Modified on the Server def show @band = Band.find(params[:id]) fresh_when(:etag => @band, :last_modified => @band, :public => true) expires_in 10.minutes, :public => true end Note: server still does a db query, but doesn’t render a template Saves on rendering & bandwidth for response transfer Wednesday, October 9, 13

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Cache-Control limitations Server Wednesday, October 9, 13

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Cache-Control limitations Server Wednesday, October 9, 13

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Cache-Control limitations Server Cache-Control: max-age: 600 Wednesday, October 9, 13

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Cache-Control limitations Server Cache-Control: max-age: 600 Wednesday, October 9, 13

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Cache-Control limitations Server Cache-Control: max-age: 600 Cache-Control: max-age: 600 Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Cache-Control: max-age: 600 Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Cache-Control: max-age: 600 Wednesday, October 9, 13

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Cache-Control: max-age: 600 Varnish / Squid / Nginx Cache-Control: max-age: 600 Wednesday, October 9, 13

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Leverage Cache-Control? HTTP/1.1 200 OK Content-Type: application/json Content-Length: 37142 Etag:“e6482391249374127ca94128” Cache-Control:max-age=9999999999, public Date:Sun, 21 Oct 2012 16:15:37 GMT Wednesday, October 9, 13

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.JLF %PO`UFWFSDBMMNFBHBJO Wednesday, October 9, 13

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Pros / Cons of Cache-Control Client doesn’t wait for response Server spends no resources But, clients may render stale data Wednesday, October 9, 13

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Pros / Cons of Etag / IMS Server skips rendering Miniscule data transfer Appears instantaneous* But, server still doing a db query Wednesday, October 9, 13

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Reason about your data • List of US States • User’s Profile • Customer’s Order • Activity Timeline • Yesterday’s stats Wednesday, October 9, 13

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Tradeoff Fresh

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Caching w/ NSURLSession Leverages NSURLCache already Use default session configuration or customize cache settings Use ephemeral configuration to disable caching Wednesday, October 9, 13

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Caching w/ NSURLSession Customize if needed NSURLCache *cache = [[NSURLCache alloc] initWithMemoryCapacity:1024*1024*10 diskCapacity:1024*1024*50 diskPath:nil]; [sessionConfiguration setURLCache:cache]; Wednesday, October 9, 13

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Default Cache Location ~/Library/Caches/com.acme.app/Cache.db Wednesday, October 9, 13

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Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK (parsed response) Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK (parsed response) update cache Wednesday, October 9, 13

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK (parsed response) (parsed response) update cache Wednesday, October 9, 13

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API Design Tips Don’t expose your internal model http://www.myspace.com/na6_build/photos/20613762 Wednesday, October 9, 13

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API Design Tips Version your API Wednesday, October 9, 13

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API Design Tips Send OS Version, App Version, and Device Name as headers Device Name OS Version App Version Wednesday, October 9, 13

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API Design Tips Have a way to notify clients to upgrade (even force) Wednesday, October 9, 13

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API Design Tips • Techniques for permeating deletes • Valid ID Check • Client requests changes, server returns a set of new records, changed records, and deleted record ids Wednesday, October 9, 13

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API Design Tips Page Large Datasets Wednesday, October 9, 13

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API Design Tips Build-in HTTP Caching support from day 1 Wednesday, October 9, 13

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API Design Tips Take care when caching user-specific data Wednesday, October 9, 13

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API Design Tips Turn on Gzip Compression Wednesday, October 9, 13

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API Design Tips Measure your API response times Wednesday, October 9, 13

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Thank you! Ben Scheirman @subdigital @bens (adn) @nsscreencast Wednesday, October 9, 13