Introduction to CocoaLumberjack

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CocoaLumberjack

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Hi! I’m Kristian @ksmandersen

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CocoaLumberjack

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Why? • NSLog is inflexible • NSLog is slow • NSLog has no levels

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Performance “[…] I switched out all the logging statements from using NSLog to use CocoaLumberjacks DDLog instead, and saw an increase in performance of almost 6x […]”

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Performance “[…] I switched out all the logging statements from using NSLog to use CocoaLumberjacks DDLog instead, and saw an increase in performance of almost 6x […]”

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Performance 1. Open a new connection to ASL daemon 2. Send message to ASL daemon 3. Close that connection 4. Write the same message to STDERR 5. for each NSLog statement: GOTO 1;

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CocoaLumberjack • Multiple outputs • Different logging levels • Much faster! • Very flexible

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Getting started [DDLog addLogger:[DDTTYLogger sharedInstance]];

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LEVELS DDLogError(@"Some error %@, %@", error, error.userInfo); DDLogWarn(@"Unexpected thing"); DDLogInfo(@"Heads up here"); DDLogDebug(@"Bug bug debug"); DDLogVerbose(@"Extreme verbosity");

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Replacing NSLOG // Making NSLog use Cocoa Lumberjack #define NSLog DDLogInfo

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Replacing NSLOG // Making NSLog use Cocoa Lumberjack #define NSLog DDLogInfo

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Colors https://github.com/robbiehanson/XcodeColors

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AFNetworking AFNetworkActivityLogger *logger = [AFNetworkActivityLogger sharedLogger]; ! [logger setLevel:AFLoggerLevelInfo]]; [logger startLogging];

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AFNetworking GET http://example.com/foo/bar.json 200 http://example.com/foo/bar.json ! POST http://example.com/other/url.json 503 http://example.com/other/url.json

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Crashlytics [DDLog addLogger:[CrashlyticsLogger sharedInstance]];

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Formatters - (NSString *)formatLogMessage:(DDLogMessage *)logMessage { NSString *logLevel; switch (logMessage->logFlag) { case LOG_FLAG_ERROR : logLevel = @"E"; break; case LOG_FLAG_WARN : logLevel = @"W"; break; case LOG_FLAG_INFO : logLevel = @"I"; break; case LOG_FLAG_DEBUG : logLevel = @"D"; break; default : logLevel = @"V"; break; } return [NSString stringWithFormat:@"%@ | %@\n", logLevel, logMessage->logMsg]; }

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Per logger levels [DDLog addLogger:[DDTTYLogger sharedInstance] withLogLevel:LOG_LEVEL_INFO];

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PER CLASS LEVEL + (NSArray *)registeredClasses; + (NSArray *)registeredClassNames; ! + (int)logLevelForClass:(Class)aClass; + (int)logLevelForClassWithName:(NSString *)aClassName; ! + (void)setLogLevel:(int)logLevel forClass:(Class)aClass; + (void)setLogLevel:(int)logLevel forClassWithName:(NSString *)aClassName;

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App broken w/ no crash

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