[iOS] App ExtensionsからNetwork経由でLogを送る

http-server-logger.js

var http = require('http');

var server = http.createServer(function (req, res) {
  var body_str = "";
  req.on('data', function(chunk) { body_str += chunk });
  req.on('error', function(e) { console.log('problem with request: ' + e.message) });

  req.on('end', function() {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end();

    console.log(body_str);
  });
});

var host = '192.168.64.28';
var port = 80;

server.listen(port, host);

console.log('Server running at http://%s:%d/', host, port);

SimpleNetLogger.m

+ (void)sendNetLoggerWithSession:(NSURLSession *)urlSession message:(NSString *)message
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss (A)";
    
    NSString *sendMessage = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:[NSDate date]], message];
    
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.64.28/"]];
    request.HTTPMethod = @"POST";
    request.HTTPBody = [sendMessage dataUsingEncoding:NSUTF8StringEncoding];
    NSURLSessionDataTask *sessionTask = [urlSession dataTaskWithRequest:request];
    [sessionTask resume];
}

いろいろ.m

// 便利なモノを定義
#define CALLED_METHOD   [NSString stringWithFormat:@"%@<%d> %s", [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, __PRETTY_FUNCTION__]

// プロパティの定義
@property (nonatomic, strong) NSURLSession *urlSession;

// NSURLSessionの生成方法は以下の通り
NSURLSessionConfiguration *config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"jp.example.backgroundsession"];
config.sharedContainerIdentifier = @"group.jp.example";
_urlSession = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];

// 呼び出し方は以下の通り  
[SimpleNetLogger sendNetLoggerWithSession:_urlSession message:CALLED_METHOD];


/*
などとやると、以下のように出力されます。

2014-11-09 13:01:37 (46897681) TodayViewController.m<89> -[TodayViewController loadView]
2014-11-09 13:01:37 (46897835) TodayViewController.m<116> -[TodayViewController viewWillAppear:]
2014-11-09 13:02:33 (46953043) TodayViewController.m<148> -[TodayViewController viewDidAppear:]
2014-11-09 13:02:33 (46953034) TodayViewController.m<116> -[TodayViewController viewWillAppear:]
2014-11-09 13:02:38 (46958592) TodayViewController.m<106> -[TodayViewController viewDidLoad]
2014-11-09 13:02:38 (46958644) TodayViewController.m<157> -[TodayViewController widgetPerformUpdateWithCompletionHandler:]
2014-11-09 13:02:38 (46958678) TodayViewController.m<116> -[TodayViewController viewWillAppear:]
2014-11-09 13:02:38 (46958699) TodayViewController.m<148> -[TodayViewController viewDidAppear:]
*/

App ExtensionsからNSURLSessionクラスを利用して、バックグラウンドでアップロードやダウンロードが出来ます。
これを利用して、 Node.jsで作った簡易HTTPサーバーへ送り、コンソールに出力しています。

意外と便利！！