Lumberjack/DDASLLogger.m

#import "DDASLLogger.h"
#import <asl.h>
#import <libkern/OSAtomic.h>

/**
 * Welcome to Cocoa Lumberjack!
 * 
 * The project page has a wealth of documentation if you have any questions.
 * https://github.com/CocoaLumberjack/CocoaLumberjack
 * 
 * If you're new to the project you may wish to read the "Getting Started" wiki.
 * https://github.com/CocoaLumberjack/CocoaLumberjack/wiki/GettingStarted
**/

#if ! __has_feature(objc_arc)
#error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
#endif

static DDASLLogger *sharedInstance;

@implementation DDASLLogger
{
    aslclient client;
}

+ (instancetype)sharedInstance
{
    static dispatch_once_t DDASLLoggerOnceToken;
    dispatch_once(&DDASLLoggerOnceToken, ^{
        sharedInstance = [[[self class] alloc] init];
    });
    
    return sharedInstance;
}

- (id)init
{
    if (sharedInstance != nil)
    {
        return nil;
    }
    
    if ((self = [super init]))
    {
        // A default asl client is provided for the main thread,
        // but background threads need to create their own client.
        
        client = asl_open(NULL, "com.apple.console", 0);
    }
    return self;
}

- (void)logMessage:(DDLogMessage *)logMessage
{
    // Skip captured log messages.
    if (strcmp(logMessage->file, "DDASLLogCapture") == 0)
        return;
    
    NSString *logMsg = logMessage->logMsg;
    
    if (formatter)
    {
        logMsg = [formatter formatLogMessage:logMessage];
    }
    
    if (logMsg)
    {
        const char *msg = [logMsg UTF8String];
        
        int aslLogLevel;
        switch (logMessage->logFlag)
        {
            // Note: By default ASL will filter anything above level 5 (Notice).
            // So our mappings shouldn't go above that level.
            case LOG_FLAG_ERROR     : aslLogLevel = ASL_LEVEL_CRIT;     break;
            case LOG_FLAG_WARN      : aslLogLevel = ASL_LEVEL_ERR;      break;
            case LOG_FLAG_INFO      : aslLogLevel = ASL_LEVEL_WARNING;  break; // Regular NSLog's level
            case LOG_FLAG_DEBUG     :
            case LOG_FLAG_VERBOSE   :
            default                 : aslLogLevel = ASL_LEVEL_NOTICE;   break;
        }
        
        aslmsg m = asl_new(ASL_TYPE_MSG);
        asl_set(m, ASL_KEY_READ_UID, "501");
        asl_log(client, m, aslLogLevel, "%s", msg);
        asl_free(m);
    }
}

- (NSString *)loggerName
{
    return @"cocoa.lumberjack.aslLogger";
}

@end