Introduction to CocoaLumberjack

Presented at Cocoaheads Copenhagen on 13 Februrary 2014

Transcript

1. CocoaLumberjack
2. Hi! I’m Kristian @ksmandersen
5. CocoaLumberjack
6. Why? • NSLog is inflexible • NSLog is slow • NSLog has no levels
7. 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 […]”
8. 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 […]”
9. 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;
10. CocoaLumberjack • Multiple outputs • Different logging levels • Much faster! • Very flexible
11. Getting started [DDLog addLogger:[DDTTYLogger sharedInstance]];
12. LEVELS DDLogError(@"Some error %@, %@", error, error.userInfo); DDLogWarn(@"Unexpected thing"); DDLogInfo(@"Heads up here"); DDLogDebug(@"Bug bug debug"); DDLogVerbose(@"Extreme verbosity");
13. Replacing NSLOG // Making NSLog use Cocoa Lumberjack #define NSLog DDLogInfo
14. Replacing NSLOG // Making NSLog use Cocoa Lumberjack #define NSLog DDLogInfo
15. Colors https://github.com/robbiehanson/XcodeColors
16. AFNetworking AFNetworkActivityLogger *logger = [AFNetworkActivityLogger sharedLogger]; ! [logger setLevel:AFLoggerLevelInfo]]; [logger startLogging];
17. 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
18. Crashlytics [DDLog addLogger:[CrashlyticsLogger sharedInstance]];
19. Formatters DDLogError(@"Paper Jam!"); // E | Paper Jam! DDLogWarn(@"Low toner."); // W | Low toner. DDLogInfo(@"Doc printed."); // I | Doc printed. DDLogDebug(@"Debugging"); // D | Debugging DDLogVerbose(@"Init doc_parse"); // V | Init doc_parse.
20. 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]; }
21. Per logger levels [DDLog addLogger:[DDTTYLogger sharedInstance] withLogLevel:LOG_LEVEL_INFO];
22. 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;
23. App broken w/ no crash
24. App broken w/ no crash
25. Rolling Logs DDFileLogger *fileLogger = [[DDFileLogger alloc] init]; ! [fileLogger setRollingFrequency:60 * 60 * 24]; [fileLogger setMaximumFileSize:1024 * 1024 * 2]; [fileLogger.logFileManager setMaximumNumberOfLogFiles:7]; [DDLog addLogger:fileLogger];
26. DEMO
27. Questions? @ksmandersen
28. jobs.robo.cat