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Effective Network Programming with Wednesday, October 24, 12

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Ben Scheirman CFOTDIFJSNBODPN !TVCEJHJUBM • Director

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Bite-sized Screencasts .com Wednesday, October 24, 12

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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? Everyone

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Why is this important? Everyone

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Exhibit A: Stuttery Scroller Wednesday, October 24, 12

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Exhibit A: Stuttery Scroller Accessing

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Exhibit B: The Perpetual Loader Wednesday, October 24, 12

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Exhibit B: The Perpetual Loader How

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Exhibit C: Slow Loader Wednesday, October 24, 12

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Exhibit C: Slow Loader Loading

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Exhibit D: Yesterday’s News Wednesday, October 24, 12

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Exhibit D: Yesterday’s News Caching

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What we’ll cover w"'/FUXPSLJOH#BTJDT w-*7&$0%*/( XJTINFMVDL w)551$BDIJOH w$BDIJOH1BUUFSOT w"1*%FTJHO5JQT Wednesday, October 24, 12

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AFNetworking Wednesday, October 24, 12

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Installation gem install cocoapods Podfile pod install platform :ios, “5.0” pod ‘AFNetworking’ Wednesday, October 24, 12

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Installation gem install cocoapods Podfile pod install platform :ios, “5.0” pod ‘AFNetworking’ Wednesday, October 24, 12

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Installation gem install cocoapods Podfile platform :ios, “5.0” pod ‘AFNetworking’ pod install Wednesday, October 24, 12

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Installation gem install cocoapods Podfile pod install platform :ios, “5.0” pod ‘AFNetworking’ Wednesday, October 24, 12

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AFNetworking Design AFHTTPRequestOperation NSOperation AFURLConnectionOperation NSURLRequest NSURLConnection Wednesday, October 24, 12

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Why NSOperation? •Queues

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Usage Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // handle success Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // handle success } failure:^(AFHTTPRequestOperation *operation, NSError *error) { Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // handle success } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // handle failure Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // handle success } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // handle failure }]; Wednesday, October 24, 12

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Usage NSURL *url = [NSURL URLWithString:@”http://google.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *operation; operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { // handle success } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // handle failure }]; [operation start]; Wednesday, October 24, 12

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Requesting JSON Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( AFHTTPRequestOperation *operation, id responseObject) { Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( AFHTTPRequestOperation *operation, id responseObject) { // responseObject is already parsed Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( AFHTTPRequestOperation *operation, id responseObject) { // responseObject is already parsed } failure:^(AFHTTPRequestOperation *operation, NSError *error) { Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( AFHTTPRequestOperation *operation, id responseObject) { // responseObject is already parsed } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // handle failure Wednesday, October 24, 12

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Requesting JSON NSURL *url = [NSURL URLWithString:@”http://jsonip.com”]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFJSONRequestOperation *operation; operation = [[AFJSONRequestOperation alloc] initWithRequest:request]; [operation setCompletionWithSuccess:^( AFHTTPRequestOperation *operation, id responseObject) { // responseObject is already parsed } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // handle failure }]; Wednesday, October 24, 12

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Requesting Images Wednesday, October 24, 12

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: Wednesday, October 24, 12

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/RH1Si.jpg”]; Wednesday, October 24, 12

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Requesting Images NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/RH1Si.jpg”]; [imageView setImageWithURL:imageUrl]; Wednesday, October 24, 12

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Say it with me now... Wednesday, October 24, 12

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/RH1Si.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; Wednesday, October 24, 12

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/RH1Si.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; WRONG Wednesday, October 24, 12

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Have you ever seen this? NSURL *imageUrl = [NSURL URLWithString: @”http://i.imgur.com/RH1Si.jpg”]; NSData *imageData = [NSData dataWithContentsOfURL:imageUrl]; UIImage *image = [UIImage imageWithData:imageData]; [imageView setImage:image]; Wednesday, October 24, 12

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Requesting XML? Wednesday, October 24, 12

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Requesting XML? AFXMLRequestOperation Wednesday, October 24, 12

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Requesting plist? Wednesday, October 24, 12

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Requesting plist? AFPropertyListRequestOperation Wednesday, October 24, 12

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Requesting raw data? Wednesday, October 24, 12

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Requesting raw data? AFHTTPRequestOperation Wednesday, October 24, 12

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API Clients

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Demo: app.net client Wednesday, October 24, 12

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What is success? 200-299 Wednesday, October 24, 12

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What about 404? AFNetworkingErrorDomain (check response code) calls failure block Wednesday, October 24, 12

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What about 302? call setRedirectResponseBlock: to alter behavior transparently handled for you Wednesday, October 24, 12

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Other errors Timeout No network available 401 Unauthorized 403 Forbidden 5xx server error Wednesday, October 24, 12

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HTTP Caching Client Server Wednesday, October 24, 12

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HTTP Caching Client Server GET /customer/152.json HTTP 1.1 Host: example.com Wednesday, October 24, 12

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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 24, 12

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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 24, 12

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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 24, 12

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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 24, 12

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Leveraging Etag on the client Client Server Wednesday, October 24, 12

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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 24, 12

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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 24, 12

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Leveraging Modified Date Client Server Wednesday, October 24, 12

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Leveraging Modified Date GET /customer/152.json HTTP 1.1 Host: example.com If-Modified-Since: Client Server Wednesday, October 24, 12

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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 24, 12

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Etag/Last Modified on the Server Wednesday, October 24, 12

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Etag/Last Modified on the Server def show Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, :last_modified => @customer, Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, :last_modified => @customer, :public => true) Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, :last_modified => @customer, :public => true) expires_in 10.minutes, :public => true Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, :last_modified => @customer, :public => true) expires_in 10.minutes, :public => true end Wednesday, October 24, 12

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Etag/Last Modified on the Server def show @customer = Customer.find(params[:id]) fresh_when(:etag => @customer, :last_modified => @customer, :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 24, 12

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Cache-Control limitations Server Wednesday, October 24, 12

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Cache-Control limitations Server Wednesday, October 24, 12

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Cache-Control limitations Server Cache-Control: max-age: 600 Wednesday, October 24, 12

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Cache-Control limitations Server Cache-Control: max-age: 600 Wednesday, October 24, 12

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Cache-Control limitations Server Cache-Control: max-age: 600 Cache-Control: max-age: 600 Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Varnish / Squid / Nginx Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Cache-Control: max-age: 600 Wednesday, October 24, 12

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Reverse-Proxy Cache FTW Server Cache-Control: max-age: 600 Varnish / Squid / Nginx Cache-Control: max-age: 600 Wednesday, October 24, 12

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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 24, 12

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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 24, 12

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.JLF %PO`UFWFSDBMMNFBHBJO Wednesday, October 24, 12

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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 24, 12

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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 24, 12

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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 24, 12

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Tradeoff Fresh

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Tradeoff Fresh

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Caching w/ AFNetworking Leverages NSURLCache already Wednesday, October 24, 12

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Caching w/ AFNetworking Customize if needed NSURLCache *cache = [[NSURLCache alloc] initWithMemoryCapacity:1024*1024*10 diskCapacity:1024*1024*50 diskPath:nil]; [NSURLCache setSharedURLCache:cache]; Wednesday, October 24, 12

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Consider alternatives SDURLCache http://github.com/steipete/SDURLCache Wednesday, October 24, 12

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Default Cache Location ~/Library/Caches/com.acme.app/Cache.db Wednesday, October 24, 12

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Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request (cached data) Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK Wednesday, October 24, 12

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Switcheroo View Controller API Client Coordinator get data start request (cached data) HTTP GET 200 OK (parsed response) Wednesday, October 24, 12

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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 24, 12

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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 24, 12

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API Design Tips Don’t expose your internal model http://www.myspace.com/na6_build/photos/20613762 Wednesday, October 24, 12

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API Design Tips Version your API Wednesday, October 24, 12

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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 24, 12

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API Design Tips Have a way to notify clients to upgrade (even force) Wednesday, October 24, 12

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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 24, 12

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API Design Tips Page Large Datasets Wednesday, October 24, 12

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API Design Tips Build-in HTTP Caching support from day 1 Wednesday, October 24, 12

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API Design Tips Take care when caching user-specific data Wednesday, October 24, 12

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API Design Tips Turn on Gzip Compression Wednesday, October 24, 12

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API Design Tips Measure your API response times Wednesday, October 24, 12

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Thank you! Ben Scheirman @subdigital nsscreencast.com Wednesday, October 24, 12