1301 lines
44 KiB
Objective-C
1301 lines
44 KiB
Objective-C
// Software License Agreement (BSD License)
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//
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// Copyright (c) 2010-2019, Deusty, LLC
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// All rights reserved.
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//
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// Redistribution and use of this software in source and binary forms,
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// with or without modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Neither the name of Deusty nor the names of its contributors may be used
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// to endorse or promote products derived from this software without specific
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// prior written permission of Deusty, LLC.
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// Disable legacy macros
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#ifndef DD_LEGACY_MACROS
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#define DD_LEGACY_MACROS 0
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#endif
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#import "DDLog.h"
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#import <pthread.h>
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#import <objc/runtime.h>
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#if TARGET_OS_IOS
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#import <UIKit/UIDevice.h>
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#import <UIKit/UIApplication.h>
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#elif !defined(DD_CLI) && __has_include(<AppKit/NSApplication.h>)
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#import <AppKit/NSApplication.h>
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#endif
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#if !__has_feature(objc_arc)
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#error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
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#endif
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// We probably shouldn't be using DDLog() statements within the DDLog implementation.
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// But we still want to leave our log statements for any future debugging,
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// and to allow other developers to trace the implementation (which is a great learning tool).
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//
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// So we use a primitive logging macro around NSLog.
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// We maintain the NS prefix on the macros to be explicit about the fact that we're using NSLog.
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#ifndef DD_DEBUG
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#define DD_DEBUG 0
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#endif
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#define NSLogDebug(frmt, ...) do{ if(DD_DEBUG) NSLog((frmt), ##__VA_ARGS__); } while(0)
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// Specifies the maximum queue size of the logging thread.
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//
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// Since most logging is asynchronous, its possible for rogue threads to flood the logging queue.
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// That is, to issue an abundance of log statements faster than the logging thread can keep up.
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// Typically such a scenario occurs when log statements are added haphazardly within large loops,
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// but may also be possible if relatively slow loggers are being used.
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//
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// This property caps the queue size at a given number of outstanding log statements.
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// If a thread attempts to issue a log statement when the queue is already maxed out,
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// the issuing thread will block until the queue size drops below the max again.
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#ifndef DDLOG_MAX_QUEUE_SIZE
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#define DDLOG_MAX_QUEUE_SIZE 1000 // Should not exceed INT32_MAX
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#endif
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// The "global logging queue" refers to [DDLog loggingQueue].
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// It is the queue that all log statements go through.
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//
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// The logging queue sets a flag via dispatch_queue_set_specific using this key.
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// We can check for this key via dispatch_get_specific() to see if we're on the "global logging queue".
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static void *const GlobalLoggingQueueIdentityKey = (void *)&GlobalLoggingQueueIdentityKey;
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@interface DDLoggerNode : NSObject
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{
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// Direct accessors to be used only for performance
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@public
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id <DDLogger> _logger;
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DDLogLevel _level;
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dispatch_queue_t _loggerQueue;
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}
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@property (nonatomic, readonly) id <DDLogger> logger;
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@property (nonatomic, readonly) DDLogLevel level;
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@property (nonatomic, readonly) dispatch_queue_t loggerQueue;
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+ (DDLoggerNode *)nodeWithLogger:(id <DDLogger>)logger
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loggerQueue:(dispatch_queue_t)loggerQueue
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level:(DDLogLevel)level;
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@end
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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@interface DDLog ()
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// An array used to manage all the individual loggers.
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// The array is only modified on the loggingQueue/loggingThread.
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@property (nonatomic, strong) NSMutableArray *_loggers;
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@end
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@implementation DDLog
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// All logging statements are added to the same queue to ensure FIFO operation.
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static dispatch_queue_t _loggingQueue;
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// Individual loggers are executed concurrently per log statement.
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// Each logger has it's own associated queue, and a dispatch group is used for synchronization.
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static dispatch_group_t _loggingGroup;
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// In order to prevent to queue from growing infinitely large,
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// a maximum size is enforced (DDLOG_MAX_QUEUE_SIZE).
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static dispatch_semaphore_t _queueSemaphore;
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// Minor optimization for uniprocessor machines
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static NSUInteger _numProcessors;
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/**
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* Returns the singleton `DDLog`.
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* The instance is used by `DDLog` class methods.
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*
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* @return The singleton `DDLog`.
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*/
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+ (instancetype)sharedInstance {
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static id sharedInstance = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedInstance = [[self alloc] init];
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});
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return sharedInstance;
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}
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/**
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* The runtime sends initialize to each class in a program exactly one time just before the class,
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* or any class that inherits from it, is sent its first message from within the program. (Thus the
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* method may never be invoked if the class is not used.) The runtime sends the initialize message to
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* classes in a thread-safe manner. Superclasses receive this message before their subclasses.
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*
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* This method may also be called directly, hence the safety mechanism.
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**/
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+ (void)initialize {
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static dispatch_once_t DDLogOnceToken;
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dispatch_once(&DDLogOnceToken, ^{
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NSLogDebug(@"DDLog: Using grand central dispatch");
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_loggingQueue = dispatch_queue_create("cocoa.lumberjack", NULL);
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_loggingGroup = dispatch_group_create();
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void *nonNullValue = GlobalLoggingQueueIdentityKey; // Whatever, just not null
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dispatch_queue_set_specific(_loggingQueue, GlobalLoggingQueueIdentityKey, nonNullValue, NULL);
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_queueSemaphore = dispatch_semaphore_create(DDLOG_MAX_QUEUE_SIZE);
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// Figure out how many processors are available.
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// This may be used later for an optimization on uniprocessor machines.
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_numProcessors = MAX([NSProcessInfo processInfo].processorCount, (NSUInteger) 1);
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NSLogDebug(@"DDLog: numProcessors = %@", @(_numProcessors));
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});
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}
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/**
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* The `DDLog` initializer.
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* Static variables are set only once.
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*
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* @return An initialized `DDLog` instance.
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*/
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- (id)init {
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self = [super init];
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if (self) {
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self._loggers = [[NSMutableArray alloc] initWithCapacity:4];
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#if TARGET_OS_IOS
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NSString *notificationName = UIApplicationWillTerminateNotification;
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#else
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NSString *notificationName = nil;
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// On Command Line Tool apps AppKit may not be available
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#if !defined(DD_CLI) && __has_include(<AppKit/NSApplication.h>)
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if (NSApp) {
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notificationName = NSApplicationWillTerminateNotification;
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}
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#endif
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if (!notificationName) {
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// If there is no NSApp -> we are running Command Line Tool app.
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// In this case terminate notification wouldn't be fired, so we use workaround.
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__weak __auto_type weakSelf = self;
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atexit_b (^{
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[weakSelf applicationWillTerminate:nil];
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});
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}
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#endif /* if TARGET_OS_IOS */
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if (notificationName) {
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationWillTerminate:)
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name:notificationName
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object:nil];
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}
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}
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return self;
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}
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/**
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* Provides access to the logging queue.
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**/
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+ (dispatch_queue_t)loggingQueue {
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return _loggingQueue;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Notifications
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (void)applicationWillTerminate:(NSNotification * __attribute__((unused)))notification {
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[self flushLog];
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Logger Management
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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+ (void)addLogger:(id <DDLogger>)logger {
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[self.sharedInstance addLogger:logger];
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}
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- (void)addLogger:(id <DDLogger>)logger {
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[self addLogger:logger withLevel:DDLogLevelAll]; // DDLogLevelAll has all bits set
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}
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+ (void)addLogger:(id <DDLogger>)logger withLevel:(DDLogLevel)level {
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[self.sharedInstance addLogger:logger withLevel:level];
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}
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- (void)addLogger:(id <DDLogger>)logger withLevel:(DDLogLevel)level {
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if (!logger) {
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return;
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}
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dispatch_async(_loggingQueue, ^{ @autoreleasepool {
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[self lt_addLogger:logger level:level];
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} });
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}
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+ (void)removeLogger:(id <DDLogger>)logger {
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[self.sharedInstance removeLogger:logger];
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}
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- (void)removeLogger:(id <DDLogger>)logger {
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if (!logger) {
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return;
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}
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dispatch_async(_loggingQueue, ^{ @autoreleasepool {
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[self lt_removeLogger:logger];
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} });
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}
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+ (void)removeAllLoggers {
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[self.sharedInstance removeAllLoggers];
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}
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- (void)removeAllLoggers {
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dispatch_async(_loggingQueue, ^{ @autoreleasepool {
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[self lt_removeAllLoggers];
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} });
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}
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+ (NSArray<id<DDLogger>> *)allLoggers {
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return [self.sharedInstance allLoggers];
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}
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- (NSArray<id<DDLogger>> *)allLoggers {
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__block NSArray *theLoggers;
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dispatch_sync(_loggingQueue, ^{ @autoreleasepool {
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theLoggers = [self lt_allLoggers];
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} });
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return theLoggers;
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}
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+ (NSArray<DDLoggerInformation *> *)allLoggersWithLevel {
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return [self.sharedInstance allLoggersWithLevel];
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}
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- (NSArray<DDLoggerInformation *> *)allLoggersWithLevel {
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__block NSArray *theLoggersWithLevel;
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dispatch_sync(_loggingQueue, ^{ @autoreleasepool {
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theLoggersWithLevel = [self lt_allLoggersWithLevel];
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} });
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return theLoggersWithLevel;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark - Master Logging
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (void)queueLogMessage:(DDLogMessage *)logMessage asynchronously:(BOOL)asyncFlag {
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// We have a tricky situation here...
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//
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// In the common case, when the queueSize is below the maximumQueueSize,
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// we want to simply enqueue the logMessage. And we want to do this as fast as possible,
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// which means we don't want to block and we don't want to use any locks.
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//
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// However, if the queueSize gets too big, we want to block.
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// But we have very strict requirements as to when we block, and how long we block.
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//
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// The following example should help illustrate our requirements:
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//
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// Imagine that the maximum queue size is configured to be 5,
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// and that there are already 5 log messages queued.
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// Let us call these 5 queued log messages A, B, C, D, and E. (A is next to be executed)
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//
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// Now if our thread issues a log statement (let us call the log message F),
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// it should block before the message is added to the queue.
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// Furthermore, it should be unblocked immediately after A has been unqueued.
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//
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// The requirements are strict in this manner so that we block only as long as necessary,
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// and so that blocked threads are unblocked in the order in which they were blocked.
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//
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// Returning to our previous example, let us assume that log messages A through E are still queued.
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// Our aforementioned thread is blocked attempting to queue log message F.
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// Now assume we have another separate thread that attempts to issue log message G.
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// It should block until log messages A and B have been unqueued.
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// We are using a counting semaphore provided by GCD.
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// The semaphore is initialized with our DDLOG_MAX_QUEUE_SIZE value.
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// Every time we want to queue a log message we decrement this value.
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// If the resulting value is less than zero,
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// the semaphore function waits in FIFO order for a signal to occur before returning.
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//
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// A dispatch semaphore is an efficient implementation of a traditional counting semaphore.
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// Dispatch semaphores call down to the kernel only when the calling thread needs to be blocked.
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// If the calling semaphore does not need to block, no kernel call is made.
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dispatch_block_t logBlock = ^{
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dispatch_semaphore_wait(_queueSemaphore, DISPATCH_TIME_FOREVER);
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// We're now sure we won't overflow the queue.
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// It is time to queue our log message.
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@autoreleasepool {
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[self lt_log:logMessage];
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}
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};
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if (asyncFlag) {
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dispatch_async(_loggingQueue, logBlock);
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} else if (dispatch_get_specific(GlobalLoggingQueueIdentityKey)) {
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// We've logged an error message while on the logging queue...
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logBlock();
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} else {
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dispatch_sync(_loggingQueue, logBlock);
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}
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}
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+ (void)log:(BOOL)asynchronous
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag
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format:(NSString *)format, ... {
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va_list args;
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if (format) {
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va_start(args, format);
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NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
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va_end(args);
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va_start(args, format);
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[self log:asynchronous
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message:message
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level:level
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flag:flag
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context:context
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file:file
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function:function
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line:line
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tag:tag];
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va_end(args);
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}
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}
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- (void)log:(BOOL)asynchronous
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag
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format:(NSString *)format, ... {
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va_list args;
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if (format) {
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va_start(args, format);
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NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
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va_end(args);
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va_start(args, format);
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[self log:asynchronous
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message:message
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level:level
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flag:flag
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context:context
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file:file
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function:function
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line:line
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tag:tag];
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va_end(args);
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}
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}
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+ (void)log:(BOOL)asynchronous
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag
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format:(NSString *)format
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args:(va_list)args {
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[self.sharedInstance log:asynchronous level:level flag:flag context:context file:file function:function line:line tag:tag format:format args:args];
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}
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- (void)log:(BOOL)asynchronous
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag
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format:(NSString *)format
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args:(va_list)args {
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if (format) {
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NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
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[self log:asynchronous
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message:message
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level:level
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flag:flag
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context:context
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file:file
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function:function
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line:line
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tag:tag];
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}
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}
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+ (void)log:(BOOL)asynchronous
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message:(NSString *)message
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag {
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[self.sharedInstance log:asynchronous message:message level:level flag:flag context:context file:file function:function line:line tag:tag];
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}
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- (void)log:(BOOL)asynchronous
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message:(NSString *)message
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level:(DDLogLevel)level
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flag:(DDLogFlag)flag
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context:(NSInteger)context
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file:(const char *)file
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function:(const char *)function
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line:(NSUInteger)line
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tag:(id)tag {
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DDLogMessage *logMessage = [[DDLogMessage alloc] initWithMessage:message
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level:level
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flag:flag
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context:context
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file:[NSString stringWithFormat:@"%s", file]
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function:[NSString stringWithFormat:@"%s", function]
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line:line
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tag:tag
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options:(DDLogMessageOptions)0
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timestamp:nil];
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[self queueLogMessage:logMessage asynchronously:asynchronous];
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}
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+ (void)log:(BOOL)asynchronous
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message:(DDLogMessage *)logMessage {
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[self.sharedInstance log:asynchronous message:logMessage];
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}
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- (void)log:(BOOL)asynchronous
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message:(DDLogMessage *)logMessage {
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[self queueLogMessage:logMessage asynchronously:asynchronous];
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}
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+ (void)flushLog {
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[self.sharedInstance flushLog];
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}
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- (void)flushLog {
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dispatch_sync(_loggingQueue, ^{ @autoreleasepool {
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[self lt_flush];
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} });
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Registered Dynamic Logging
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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+ (BOOL)isRegisteredClass:(Class)class {
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SEL getterSel = @selector(ddLogLevel);
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SEL setterSel = @selector(ddSetLogLevel:);
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#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
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// Issue #6 (GoogleCode) - Crashes on iOS 4.2.1 and iPhone 4
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//
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// Crash caused by class_getClassMethod(2).
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//
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// "It's a bug with UIAccessibilitySafeCategory__NSObject so it didn't pop up until
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// users had VoiceOver enabled [...]. I was able to work around it by searching the
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// result of class_copyMethodList() instead of calling class_getClassMethod()"
|
|
|
|
BOOL result = NO;
|
|
|
|
unsigned int methodCount, i;
|
|
Method *methodList = class_copyMethodList(object_getClass(class), &methodCount);
|
|
|
|
if (methodList != NULL) {
|
|
BOOL getterFound = NO;
|
|
BOOL setterFound = NO;
|
|
|
|
for (i = 0; i < methodCount; ++i) {
|
|
SEL currentSel = method_getName(methodList[i]);
|
|
|
|
if (currentSel == getterSel) {
|
|
getterFound = YES;
|
|
} else if (currentSel == setterSel) {
|
|
setterFound = YES;
|
|
}
|
|
|
|
if (getterFound && setterFound) {
|
|
result = YES;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(methodList);
|
|
}
|
|
|
|
return result;
|
|
|
|
#else /* if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR */
|
|
|
|
// Issue #24 (GitHub) - Crashing in in ARC+Simulator
|
|
//
|
|
// The method +[DDLog isRegisteredClass] will crash a project when using it with ARC + Simulator.
|
|
// For running in the Simulator, it needs to execute the non-iOS code.
|
|
|
|
Method getter = class_getClassMethod(class, getterSel);
|
|
Method setter = class_getClassMethod(class, setterSel);
|
|
|
|
if ((getter != NULL) && (setter != NULL)) {
|
|
return YES;
|
|
}
|
|
|
|
return NO;
|
|
|
|
#endif /* if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR */
|
|
}
|
|
|
|
+ (NSArray *)registeredClasses {
|
|
|
|
// We're going to get the list of all registered classes.
|
|
// The Objective-C runtime library automatically registers all the classes defined in your source code.
|
|
//
|
|
// To do this we use the following method (documented in the Objective-C Runtime Reference):
|
|
//
|
|
// int objc_getClassList(Class *buffer, int bufferLen)
|
|
//
|
|
// We can pass (NULL, 0) to obtain the total number of
|
|
// registered class definitions without actually retrieving any class definitions.
|
|
// This allows us to allocate the minimum amount of memory needed for the application.
|
|
|
|
NSUInteger numClasses = 0;
|
|
Class *classes = NULL;
|
|
|
|
while (numClasses == 0) {
|
|
|
|
numClasses = (NSUInteger)MAX(objc_getClassList(NULL, 0), 0);
|
|
|
|
// numClasses now tells us how many classes we have (but it might change)
|
|
// So we can allocate our buffer, and get pointers to all the class definitions.
|
|
|
|
NSUInteger bufferSize = numClasses;
|
|
|
|
classes = numClasses ? (Class *)calloc(bufferSize, sizeof(Class)) : NULL;
|
|
if (classes == NULL) {
|
|
return @[]; //no memory or classes?
|
|
}
|
|
|
|
numClasses = (NSUInteger)MAX(objc_getClassList(classes, (int)bufferSize),0);
|
|
|
|
if (numClasses > bufferSize || numClasses == 0) {
|
|
//apparently more classes added between calls (or a problem); try again
|
|
free(classes);
|
|
classes = NULL;
|
|
numClasses = 0;
|
|
}
|
|
}
|
|
|
|
// We can now loop through the classes, and test each one to see if it is a DDLogging class.
|
|
|
|
NSMutableArray *result = [NSMutableArray arrayWithCapacity:numClasses];
|
|
|
|
for (NSUInteger i = 0; i < numClasses; i++) {
|
|
Class class = classes[i];
|
|
|
|
if ([self isRegisteredClass:class]) {
|
|
[result addObject:class];
|
|
}
|
|
}
|
|
|
|
free(classes);
|
|
|
|
return result;
|
|
}
|
|
|
|
+ (NSArray *)registeredClassNames {
|
|
NSArray *registeredClasses = [self registeredClasses];
|
|
NSMutableArray *result = [NSMutableArray arrayWithCapacity:[registeredClasses count]];
|
|
|
|
for (Class class in registeredClasses) {
|
|
[result addObject:NSStringFromClass(class)];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
+ (DDLogLevel)levelForClass:(Class)aClass {
|
|
if ([self isRegisteredClass:aClass]) {
|
|
return [aClass ddLogLevel];
|
|
}
|
|
return (DDLogLevel)-1;
|
|
}
|
|
|
|
+ (DDLogLevel)levelForClassWithName:(NSString *)aClassName {
|
|
Class aClass = NSClassFromString(aClassName);
|
|
|
|
return [self levelForClass:aClass];
|
|
}
|
|
|
|
+ (void)setLevel:(DDLogLevel)level forClass:(Class)aClass {
|
|
if ([self isRegisteredClass:aClass]) {
|
|
[aClass ddSetLogLevel:level];
|
|
}
|
|
}
|
|
|
|
+ (void)setLevel:(DDLogLevel)level forClassWithName:(NSString *)aClassName {
|
|
Class aClass = NSClassFromString(aClassName);
|
|
[self setLevel:level forClass:aClass];
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
#pragma mark Logging Thread
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
- (void)lt_addLogger:(id <DDLogger>)logger level:(DDLogLevel)level {
|
|
// Add to loggers array.
|
|
// Need to create loggerQueue if loggerNode doesn't provide one.
|
|
|
|
for (DDLoggerNode* node in self._loggers) {
|
|
if (node->_logger == logger
|
|
&& node->_level == level) {
|
|
// Exactly same logger already added, exit
|
|
return;
|
|
}
|
|
}
|
|
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
dispatch_queue_t loggerQueue = NULL;
|
|
|
|
if ([logger respondsToSelector:@selector(loggerQueue)]) {
|
|
// Logger may be providing its own queue
|
|
|
|
loggerQueue = [logger loggerQueue];
|
|
}
|
|
|
|
if (loggerQueue == nil) {
|
|
// Automatically create queue for the logger.
|
|
// Use the logger name as the queue name if possible.
|
|
|
|
const char *loggerQueueName = NULL;
|
|
|
|
if ([logger respondsToSelector:@selector(loggerName)]) {
|
|
loggerQueueName = [[logger loggerName] UTF8String];
|
|
}
|
|
|
|
loggerQueue = dispatch_queue_create(loggerQueueName, NULL);
|
|
}
|
|
|
|
DDLoggerNode *loggerNode = [DDLoggerNode nodeWithLogger:logger loggerQueue:loggerQueue level:level];
|
|
[self._loggers addObject:loggerNode];
|
|
|
|
if ([logger respondsToSelector:@selector(didAddLoggerInQueue:)]) {
|
|
dispatch_async(loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[logger didAddLoggerInQueue:loggerNode->_loggerQueue];
|
|
} });
|
|
} else if ([logger respondsToSelector:@selector(didAddLogger)]) {
|
|
dispatch_async(loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[logger didAddLogger];
|
|
} });
|
|
}
|
|
}
|
|
|
|
- (void)lt_removeLogger:(id <DDLogger>)logger {
|
|
// Find associated loggerNode in list of added loggers
|
|
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
DDLoggerNode *loggerNode = nil;
|
|
|
|
for (DDLoggerNode *node in self._loggers) {
|
|
if (node->_logger == logger) {
|
|
loggerNode = node;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (loggerNode == nil) {
|
|
NSLogDebug(@"DDLog: Request to remove logger which wasn't added");
|
|
return;
|
|
}
|
|
|
|
// Notify logger
|
|
if ([logger respondsToSelector:@selector(willRemoveLogger)]) {
|
|
dispatch_async(loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[logger willRemoveLogger];
|
|
} });
|
|
}
|
|
|
|
// Remove from loggers array
|
|
[self._loggers removeObject:loggerNode];
|
|
}
|
|
|
|
- (void)lt_removeAllLoggers {
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
// Notify all loggers
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
if ([loggerNode->_logger respondsToSelector:@selector(willRemoveLogger)]) {
|
|
dispatch_async(loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[loggerNode->_logger willRemoveLogger];
|
|
} });
|
|
}
|
|
}
|
|
|
|
// Remove all loggers from array
|
|
|
|
[self._loggers removeAllObjects];
|
|
}
|
|
|
|
- (NSArray *)lt_allLoggers {
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
NSMutableArray *theLoggers = [NSMutableArray new];
|
|
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
[theLoggers addObject:loggerNode->_logger];
|
|
}
|
|
|
|
return [theLoggers copy];
|
|
}
|
|
|
|
- (NSArray *)lt_allLoggersWithLevel {
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
NSMutableArray *theLoggersWithLevel = [NSMutableArray new];
|
|
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
[theLoggersWithLevel addObject:[DDLoggerInformation informationWithLogger:loggerNode->_logger
|
|
andLevel:loggerNode->_level]];
|
|
}
|
|
|
|
return [theLoggersWithLevel copy];
|
|
}
|
|
|
|
- (void)lt_log:(DDLogMessage *)logMessage {
|
|
// Execute the given log message on each of our loggers.
|
|
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
if (_numProcessors > 1) {
|
|
// Execute each logger concurrently, each within its own queue.
|
|
// All blocks are added to same group.
|
|
// After each block has been queued, wait on group.
|
|
//
|
|
// The waiting ensures that a slow logger doesn't end up with a large queue of pending log messages.
|
|
// This would defeat the purpose of the efforts we made earlier to restrict the max queue size.
|
|
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
// skip the loggers that shouldn't write this message based on the log level
|
|
|
|
if (!(logMessage->_flag & loggerNode->_level)) {
|
|
continue;
|
|
}
|
|
|
|
dispatch_group_async(_loggingGroup, loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[loggerNode->_logger logMessage:logMessage];
|
|
} });
|
|
}
|
|
|
|
dispatch_group_wait(_loggingGroup, DISPATCH_TIME_FOREVER);
|
|
} else {
|
|
// Execute each logger serially, each within its own queue.
|
|
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
// skip the loggers that shouldn't write this message based on the log level
|
|
|
|
if (!(logMessage->_flag & loggerNode->_level)) {
|
|
continue;
|
|
}
|
|
|
|
#if DD_DEBUG
|
|
// we must assure that we aren not on loggerNode->_loggerQueue.
|
|
if (loggerNode->_loggerQueue == NULL) {
|
|
// tell that we can't dispatch logger node on queue that is NULL.
|
|
NSLogDebug(@"DDLog: current node has loggerQueue == NULL");
|
|
}
|
|
else {
|
|
dispatch_async(loggerNode->_loggerQueue, ^{
|
|
if (dispatch_get_specific(GlobalLoggingQueueIdentityKey)) {
|
|
// tell that we somehow on logging queue?
|
|
NSLogDebug(@"DDLog: current node has loggerQueue == globalLoggingQueue");
|
|
}
|
|
});
|
|
}
|
|
#endif
|
|
// next, we must check that node is OK.
|
|
dispatch_sync(loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[loggerNode->_logger logMessage:logMessage];
|
|
} });
|
|
}
|
|
}
|
|
|
|
// If our queue got too big, there may be blocked threads waiting to add log messages to the queue.
|
|
// Since we've now dequeued an item from the log, we may need to unblock the next thread.
|
|
|
|
// We are using a counting semaphore provided by GCD.
|
|
// The semaphore is initialized with our DDLOG_MAX_QUEUE_SIZE value.
|
|
// When a log message is queued this value is decremented.
|
|
// When a log message is dequeued this value is incremented.
|
|
// If the value ever drops below zero,
|
|
// the queueing thread blocks and waits in FIFO order for us to signal it.
|
|
//
|
|
// A dispatch semaphore is an efficient implementation of a traditional counting semaphore.
|
|
// Dispatch semaphores call down to the kernel only when the calling thread needs to be blocked.
|
|
// If the calling semaphore does not need to block, no kernel call is made.
|
|
|
|
dispatch_semaphore_signal(_queueSemaphore);
|
|
}
|
|
|
|
- (void)lt_flush {
|
|
// All log statements issued before the flush method was invoked have now been executed.
|
|
//
|
|
// Now we need to propagate the flush request to any loggers that implement the flush method.
|
|
// This is designed for loggers that buffer IO.
|
|
|
|
NSAssert(dispatch_get_specific(GlobalLoggingQueueIdentityKey),
|
|
@"This method should only be run on the logging thread/queue");
|
|
|
|
for (DDLoggerNode *loggerNode in self._loggers) {
|
|
if ([loggerNode->_logger respondsToSelector:@selector(flush)]) {
|
|
dispatch_group_async(_loggingGroup, loggerNode->_loggerQueue, ^{ @autoreleasepool {
|
|
[loggerNode->_logger flush];
|
|
} });
|
|
}
|
|
}
|
|
|
|
dispatch_group_wait(_loggingGroup, DISPATCH_TIME_FOREVER);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
#pragma mark Utilities
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
NSString * __nullable DDExtractFileNameWithoutExtension(const char *filePath, BOOL copy) {
|
|
if (filePath == NULL) {
|
|
return nil;
|
|
}
|
|
|
|
char *lastSlash = NULL;
|
|
char *lastDot = NULL;
|
|
|
|
char *p = (char *)filePath;
|
|
|
|
while (*p != '\0') {
|
|
if (*p == '/') {
|
|
lastSlash = p;
|
|
} else if (*p == '.') {
|
|
lastDot = p;
|
|
}
|
|
|
|
p++;
|
|
}
|
|
|
|
char *subStr;
|
|
NSUInteger subLen;
|
|
|
|
if (lastSlash) {
|
|
if (lastDot) {
|
|
// lastSlash -> lastDot
|
|
subStr = lastSlash + 1;
|
|
subLen = (NSUInteger)(lastDot - subStr);
|
|
} else {
|
|
// lastSlash -> endOfString
|
|
subStr = lastSlash + 1;
|
|
subLen = (NSUInteger)(p - subStr);
|
|
}
|
|
} else {
|
|
if (lastDot) {
|
|
// startOfString -> lastDot
|
|
subStr = (char *)filePath;
|
|
subLen = (NSUInteger)(lastDot - subStr);
|
|
} else {
|
|
// startOfString -> endOfString
|
|
subStr = (char *)filePath;
|
|
subLen = (NSUInteger)(p - subStr);
|
|
}
|
|
}
|
|
|
|
if (copy) {
|
|
return [[NSString alloc] initWithBytes:subStr
|
|
length:subLen
|
|
encoding:NSUTF8StringEncoding];
|
|
} else {
|
|
// We can take advantage of the fact that __FILE__ is a string literal.
|
|
// Specifically, we don't need to waste time copying the string.
|
|
// We can just tell NSString to point to a range within the string literal.
|
|
|
|
return [[NSString alloc] initWithBytesNoCopy:subStr
|
|
length:subLen
|
|
encoding:NSUTF8StringEncoding
|
|
freeWhenDone:NO];
|
|
}
|
|
}
|
|
|
|
@end
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
#pragma mark -
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
@implementation DDLoggerNode
|
|
|
|
- (instancetype)initWithLogger:(id <DDLogger>)logger loggerQueue:(dispatch_queue_t)loggerQueue level:(DDLogLevel)level {
|
|
if ((self = [super init])) {
|
|
_logger = logger;
|
|
|
|
if (loggerQueue) {
|
|
_loggerQueue = loggerQueue;
|
|
#if !OS_OBJECT_USE_OBJC
|
|
dispatch_retain(loggerQueue);
|
|
#endif
|
|
}
|
|
|
|
_level = level;
|
|
}
|
|
return self;
|
|
}
|
|
|
|
+ (DDLoggerNode *)nodeWithLogger:(id <DDLogger>)logger loggerQueue:(dispatch_queue_t)loggerQueue level:(DDLogLevel)level {
|
|
return [[DDLoggerNode alloc] initWithLogger:logger loggerQueue:loggerQueue level:level];
|
|
}
|
|
|
|
- (void)dealloc {
|
|
#if !OS_OBJECT_USE_OBJC
|
|
if (_loggerQueue) {
|
|
dispatch_release(_loggerQueue);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
@end
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
#pragma mark -
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
@implementation DDLogMessage
|
|
|
|
- (instancetype)init {
|
|
self = [super init];
|
|
return self;
|
|
}
|
|
|
|
- (instancetype)initWithMessage:(NSString *)message
|
|
level:(DDLogLevel)level
|
|
flag:(DDLogFlag)flag
|
|
context:(NSInteger)context
|
|
file:(NSString *)file
|
|
function:(NSString *)function
|
|
line:(NSUInteger)line
|
|
tag:(id)tag
|
|
options:(DDLogMessageOptions)options
|
|
timestamp:(NSDate *)timestamp {
|
|
if ((self = [super init])) {
|
|
BOOL copyMessage = (options & DDLogMessageDontCopyMessage) == 0;
|
|
_message = copyMessage ? [message copy] : message;
|
|
_level = level;
|
|
_flag = flag;
|
|
_context = context;
|
|
|
|
BOOL copyFile = (options & DDLogMessageCopyFile) != 0;
|
|
_file = copyFile ? [file copy] : file;
|
|
|
|
BOOL copyFunction = (options & DDLogMessageCopyFunction) != 0;
|
|
_function = copyFunction ? [function copy] : function;
|
|
|
|
_line = line;
|
|
_tag = tag;
|
|
_options = options;
|
|
_timestamp = timestamp ?: [NSDate new];
|
|
|
|
__uint64_t tid;
|
|
if (pthread_threadid_np(NULL, &tid) == 0) {
|
|
_threadID = [[NSString alloc] initWithFormat:@"%llu", tid];
|
|
} else {
|
|
_threadID = @"missing threadId";
|
|
}
|
|
_threadName = NSThread.currentThread.name;
|
|
|
|
// Get the file name without extension
|
|
_fileName = [_file lastPathComponent];
|
|
NSUInteger dotLocation = [_fileName rangeOfString:@"." options:NSBackwardsSearch].location;
|
|
if (dotLocation != NSNotFound)
|
|
{
|
|
_fileName = [_fileName substringToIndex:dotLocation];
|
|
}
|
|
|
|
// Try to get the current queue's label
|
|
_queueLabel = [[NSString alloc] initWithFormat:@"%s", dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL)];
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (id)copyWithZone:(NSZone * __attribute__((unused)))zone {
|
|
DDLogMessage *newMessage = [DDLogMessage new];
|
|
|
|
newMessage->_message = _message;
|
|
newMessage->_level = _level;
|
|
newMessage->_flag = _flag;
|
|
newMessage->_context = _context;
|
|
newMessage->_file = _file;
|
|
newMessage->_fileName = _fileName;
|
|
newMessage->_function = _function;
|
|
newMessage->_line = _line;
|
|
newMessage->_tag = _tag;
|
|
newMessage->_options = _options;
|
|
newMessage->_timestamp = _timestamp;
|
|
newMessage->_threadID = _threadID;
|
|
newMessage->_threadName = _threadName;
|
|
newMessage->_queueLabel = _queueLabel;
|
|
|
|
return newMessage;
|
|
}
|
|
|
|
@end
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
#pragma mark -
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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@implementation DDAbstractLogger
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- (instancetype)init {
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if ((self = [super init])) {
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const char *loggerQueueName = NULL;
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if ([self respondsToSelector:@selector(loggerName)]) {
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loggerQueueName = [[self loggerName] UTF8String];
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}
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_loggerQueue = dispatch_queue_create(loggerQueueName, NULL);
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// We're going to use dispatch_queue_set_specific() to "mark" our loggerQueue.
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// Later we can use dispatch_get_specific() to determine if we're executing on our loggerQueue.
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// The documentation states:
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//
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// > Keys are only compared as pointers and are never dereferenced.
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// > Thus, you can use a pointer to a static variable for a specific subsystem or
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// > any other value that allows you to identify the value uniquely.
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// > Specifying a pointer to a string constant is not recommended.
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//
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// So we're going to use the very convenient key of "self",
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// which also works when multiple logger classes extend this class, as each will have a different "self" key.
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//
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// This is used primarily for thread-safety assertions (via the isOnInternalLoggerQueue method below).
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void *key = (__bridge void *)self;
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void *nonNullValue = (__bridge void *)self;
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dispatch_queue_set_specific(_loggerQueue, key, nonNullValue, NULL);
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}
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return self;
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}
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- (void)dealloc {
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#if !OS_OBJECT_USE_OBJC
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if (_loggerQueue) {
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dispatch_release(_loggerQueue);
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}
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#endif
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}
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- (void)logMessage:(DDLogMessage * __attribute__((unused)))logMessage {
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// Override me
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}
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- (id <DDLogFormatter>)logFormatter {
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// This method must be thread safe and intuitive.
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// Therefore if somebody executes the following code:
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//
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// [logger setLogFormatter:myFormatter];
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// formatter = [logger logFormatter];
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//
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// They would expect formatter to equal myFormatter.
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// This functionality must be ensured by the getter and setter method.
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//
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// The thread safety must not come at a cost to the performance of the logMessage method.
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// This method is likely called sporadically, while the logMessage method is called repeatedly.
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// This means, the implementation of this method:
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// - Must NOT require the logMessage method to acquire a lock.
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// - Must NOT require the logMessage method to access an atomic property (also a lock of sorts).
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//
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// Thread safety is ensured by executing access to the formatter variable on the loggerQueue.
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// This is the same queue that the logMessage method operates on.
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//
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// Note: The last time I benchmarked the performance of direct access vs atomic property access,
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// direct access was over twice as fast on the desktop and over 6 times as fast on the iPhone.
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//
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// Furthermore, consider the following code:
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//
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// DDLogVerbose(@"log msg 1");
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// DDLogVerbose(@"log msg 2");
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// [logger setFormatter:myFormatter];
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// DDLogVerbose(@"log msg 3");
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//
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// Our intuitive requirement means that the new formatter will only apply to the 3rd log message.
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// This must remain true even when using asynchronous logging.
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// We must keep in mind the various queue's that are in play here:
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//
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// loggerQueue : Our own private internal queue that the logMessage method runs on.
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// Operations are added to this queue from the global loggingQueue.
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//
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// globalLoggingQueue : The queue that all log messages go through before they arrive in our loggerQueue.
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//
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// All log statements go through the serial globalLoggingQueue before they arrive at our loggerQueue.
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// Thus this method also goes through the serial globalLoggingQueue to ensure intuitive operation.
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// IMPORTANT NOTE:
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//
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// Methods within the DDLogger implementation MUST access the formatter ivar directly.
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// This method is designed explicitly for external access.
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//
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// Using "self." syntax to go through this method will cause immediate deadlock.
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// This is the intended result. Fix it by accessing the ivar directly.
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// Great strides have been take to ensure this is safe to do. Plus it's MUCH faster.
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NSAssert(![self isOnGlobalLoggingQueue], @"Core architecture requirement failure");
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NSAssert(![self isOnInternalLoggerQueue], @"MUST access ivar directly, NOT via self.* syntax.");
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dispatch_queue_t globalLoggingQueue = [DDLog loggingQueue];
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__block id <DDLogFormatter> result;
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dispatch_sync(globalLoggingQueue, ^{
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dispatch_sync(self->_loggerQueue, ^{
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result = self->_logFormatter;
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});
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});
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return result;
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}
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- (void)setLogFormatter:(id <DDLogFormatter>)logFormatter {
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// The design of this method is documented extensively in the logFormatter message (above in code).
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NSAssert(![self isOnGlobalLoggingQueue], @"Core architecture requirement failure");
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NSAssert(![self isOnInternalLoggerQueue], @"MUST access ivar directly, NOT via self.* syntax.");
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dispatch_block_t block = ^{
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@autoreleasepool {
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if (self->_logFormatter != logFormatter) {
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if ([self->_logFormatter respondsToSelector:@selector(willRemoveFromLogger:)]) {
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[self->_logFormatter willRemoveFromLogger:self];
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}
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self->_logFormatter = logFormatter;
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if ([self->_logFormatter respondsToSelector:@selector(didAddToLogger:inQueue:)]) {
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[self->_logFormatter didAddToLogger:self inQueue:self->_loggerQueue];
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} else if ([self->_logFormatter respondsToSelector:@selector(didAddToLogger:)]) {
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[self->_logFormatter didAddToLogger:self];
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}
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}
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}
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};
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dispatch_queue_t globalLoggingQueue = [DDLog loggingQueue];
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dispatch_async(globalLoggingQueue, ^{
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dispatch_async(self->_loggerQueue, block);
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});
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}
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- (dispatch_queue_t)loggerQueue {
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return _loggerQueue;
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}
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- (NSString *)loggerName {
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return NSStringFromClass([self class]);
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}
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- (BOOL)isOnGlobalLoggingQueue {
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return (dispatch_get_specific(GlobalLoggingQueueIdentityKey) != NULL);
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}
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- (BOOL)isOnInternalLoggerQueue {
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void *key = (__bridge void *)self;
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return (dispatch_get_specific(key) != NULL);
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}
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@end
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark -
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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@interface DDLoggerInformation()
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{
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// Direct accessors to be used only for performance
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@public
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id <DDLogger> _logger;
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DDLogLevel _level;
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}
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@end
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@implementation DDLoggerInformation
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- (instancetype)initWithLogger:(id <DDLogger>)logger andLevel:(DDLogLevel)level {
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if ((self = [super init])) {
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_logger = logger;
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_level = level;
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}
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return self;
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}
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+ (DDLoggerInformation *)informationWithLogger:(id <DDLogger>)logger andLevel:(DDLogLevel)level {
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return [[DDLoggerInformation alloc] initWithLogger:logger andLevel:level];
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}
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@end
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