//
// GTMLogger.m
//
// Copyright 2007-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMLogger.h"
#import <fcntl.h>
#import <unistd.h>
#import <stdlib.h>
#import <pthread.h>
#if !defined(__clang__) && (__GNUC__*10+__GNUC_MINOR__ >= 42)
// Some versions of GCC (4.2 and below AFAIK) aren't great about supporting
// -Wmissing-format-attribute
// when the function is anything more complex than foo(NSString *fmt, ...).
// You see the error inside the function when you turn ... into va_args and
// attempt to call another function (like vsprintf for example).
// So we just shut off the warning for this file. We reenable it at the end.
#pragma GCC diagnostic ignored "-Wmissing-format-attribute"
#endif // !__clang__
// Reference to the shared GTMLogger instance. This is not a singleton, it's
// just an easy reference to one shared instance.
static GTMLogger *gSharedLogger = nil;
@implementation GTMLogger
// Returns a pointer to the shared logger instance. If none exists, a standard
// logger is created and returned.
+ (id)sharedLogger {
@synchronized(self) {
if (gSharedLogger == nil) {
gSharedLogger = [[self standardLogger] retain];
}
}
return [[gSharedLogger retain] autorelease];
}
+ (void)setSharedLogger:(GTMLogger *)logger {
@synchronized(self) {
[gSharedLogger autorelease];
gSharedLogger = [logger retain];
}
}
+ (id)standardLogger {
// Don't trust NSFileHandle not to throw
@try {
id<GTMLogWriter> writer = [NSFileHandle fileHandleWithStandardOutput];
id<GTMLogFormatter> fr = [[[GTMLogStandardFormatter alloc] init]
autorelease];
id<GTMLogFilter> filter = [[[GTMLogLevelFilter alloc] init] autorelease];
return [[[self alloc] initWithWriter:writer
formatter:fr
filter:filter] autorelease];
}
@catch (id e) {
// Ignored
}
return nil;
}
+ (id)standardLoggerWithStderr {
// Don't trust NSFileHandle not to throw
@try {
id me = [self standardLogger];
[me setWriter:[NSFileHandle fileHandleWithStandardError]];
return me;
}
@catch (id e) {
// Ignored
}
return nil;
}
+ (id)standardLoggerWithStdoutAndStderr {
// We're going to take advantage of the GTMLogger to GTMLogWriter adaptor
// and create a composite logger that an outer "standard" logger can use
// as a writer. Our inner loggers should apply no formatting since the main
// logger does that and we want the caller to be able to change formatters
// or add writers without knowing the inner structure of our composite.
// Don't trust NSFileHandle not to throw
@try {
GTMLogBasicFormatter *formatter = [[[GTMLogBasicFormatter alloc] init]
autorelease];
GTMLogger *stdoutLogger =
[self loggerWithWriter:[NSFileHandle fileHandleWithStandardOutput]
formatter:formatter
filter:[[[GTMLogMaximumLevelFilter alloc]
initWithMaximumLevel:kGTMLoggerLevelInfo]
autorelease]];
GTMLogger *stderrLogger =
[self loggerWithWriter:[NSFileHandle fileHandleWithStandardError]
formatter:formatter
filter:[[[GTMLogMininumLevelFilter alloc]
initWithMinimumLevel:kGTMLoggerLevelError]
autorelease]];
GTMLogger *compositeWriter =
[self loggerWithWriter:[NSArray arrayWithObjects:
stdoutLogger, stderrLogger, nil]
formatter:formatter
filter:[[[GTMLogNoFilter alloc] init] autorelease]];
GTMLogger *outerLogger = [self standardLogger];
[outerLogger setWriter:compositeWriter];
return outerLogger;
}
@catch (id e) {
// Ignored
}
return nil;
}
+ (id)standardLoggerWithPath:(NSString *)path {
@try {
NSFileHandle *fh = [NSFileHandle fileHandleForLoggingAtPath:path mode:0644];
if (fh == nil) return nil;
id me = [self standardLogger];
[me setWriter:fh];
return me;
}
@catch (id e) {
// Ignored
}
return nil;
}
+ (id)loggerWithWriter:(id<GTMLogWriter>)writer
formatter:(id<GTMLogFormatter>)formatter
filter:(id<GTMLogFilter>)filter {
return [[[self alloc] initWithWriter:writer
formatter:formatter
filter:filter] autorelease];
}
+ (id)logger {
return [[[self alloc] init] autorelease];
}
- (id)init {
return [self initWithWriter:nil formatter:nil filter:nil];
}
- (id)initWithWriter:(id<GTMLogWriter>)writer
formatter:(id<GTMLogFormatter>)formatter
filter:(id<GTMLogFilter>)filter {
if ((self = [super init])) {
[self setWriter:writer];
[self setFormatter:formatter];
[self setFilter:filter];
}
return self;
}
- (void)dealloc {
// Unlikely, but |writer_| may be an NSFileHandle, which can throw
@try {
[formatter_ release];
[filter_ release];
[writer_ release];
}
@catch (id e) {
// Ignored
}
[super dealloc];
}
- (id<GTMLogWriter>)writer {
return [[writer_ retain] autorelease];
}
- (void)setWriter:(id<GTMLogWriter>)writer {
@synchronized(self) {
[writer_ autorelease];
writer_ = nil;
if (writer == nil) {
// Try to use stdout, but don't trust NSFileHandle
@try {
writer_ = [[NSFileHandle fileHandleWithStandardOutput] retain];
}
@catch (id e) {
// Leave |writer_| nil
}
} else {
writer_ = [writer retain];
}
}
}
- (id<GTMLogFormatter>)formatter {
return [[formatter_ retain] autorelease];
}
- (void)setFormatter:(id<GTMLogFormatter>)formatter {
@synchronized(self) {
[formatter_ autorelease];
formatter_ = nil;
if (formatter == nil) {
@try {
formatter_ = [[GTMLogBasicFormatter alloc] init];
}
@catch (id e) {
// Leave |formatter_| nil
}
} else {
formatter_ = [formatter retain];
}
}
}
- (id<GTMLogFilter>)filter {
return [[filter_ retain] autorelease];
}
- (void)setFilter:(id<GTMLogFilter>)filter {
@synchronized(self) {
[filter_ autorelease];
filter_ = nil;
if (filter == nil) {
@try {
filter_ = [[GTMLogNoFilter alloc] init];
}
@catch (id e) {
// Leave |filter_| nil
}
} else {
filter_ = [filter retain];
}
}
}
- (void)logDebug:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:NULL format:fmt valist:args level:kGTMLoggerLevelDebug];
va_end(args);
}
- (void)logInfo:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:NULL format:fmt valist:args level:kGTMLoggerLevelInfo];
va_end(args);
}
- (void)logError:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:NULL format:fmt valist:args level:kGTMLoggerLevelError];
va_end(args);
}
- (void)logAssert:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:NULL format:fmt valist:args level:kGTMLoggerLevelAssert];
va_end(args);
}
@end // GTMLogger
@implementation GTMLogger (GTMLoggerMacroHelpers)
- (void)logFuncDebug:(const char *)func msg:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:func format:fmt valist:args level:kGTMLoggerLevelDebug];
va_end(args);
}
- (void)logFuncInfo:(const char *)func msg:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:func format:fmt valist:args level:kGTMLoggerLevelInfo];
va_end(args);
}
- (void)logFuncError:(const char *)func msg:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:func format:fmt valist:args level:kGTMLoggerLevelError];
va_end(args);
}
- (void)logFuncAssert:(const char *)func msg:(NSString *)fmt, ... {
va_list args;
va_start(args, fmt);
[self logInternalFunc:func format:fmt valist:args level:kGTMLoggerLevelAssert];
va_end(args);
}
@end // GTMLoggerMacroHelpers
@implementation GTMLogger (PrivateMethods)
- (void)logInternalFunc:(const char *)func
format:(NSString *)fmt
valist:(va_list)args
level:(GTMLoggerLevel)level {
// Primary point where logging happens, logging should never throw, catch
// everything.
@try {
NSString *fname = func ? [NSString stringWithUTF8String:func] : nil;
NSString *msg = [formatter_ stringForFunc:fname
withFormat:fmt
valist:args
level:level];
if (msg && [filter_ filterAllowsMessage:msg level:level])
[writer_ logMessage:msg level:level];
}
@catch (id e) {
// Ignored
}
}
@end // PrivateMethods
@implementation NSFileHandle (GTMFileHandleLogWriter)
+ (id)fileHandleForLoggingAtPath:(NSString *)path mode:(mode_t)mode {
int fd = -1;
if (path) {
int flags = O_WRONLY | O_APPEND | O_CREAT;
fd = open([path fileSystemRepresentation], flags, mode);
}
if (fd == -1) return nil;
return [[[self alloc] initWithFileDescriptor:fd
closeOnDealloc:YES] autorelease];
}
- (void)logMessage:(NSString *)msg level:(GTMLoggerLevel)level {
@synchronized(self) {
// Closed pipes should not generate exceptions in our caller. Catch here
// as well [GTMLogger logInternalFunc:...] so that an exception in this
// writer does not prevent other writers from having a chance.
@try {
NSString *line = [NSString stringWithFormat:@"%@\n", msg];
[self writeData:[line dataUsingEncoding:NSUTF8StringEncoding]];
}
@catch (id e) {
// Ignored
}
}
}
@end // GTMFileHandleLogWriter
@implementation NSArray (GTMArrayCompositeLogWriter)
- (void)logMessage:(NSString *)msg level:(GTMLoggerLevel)level {
@synchronized(self) {
id<GTMLogWriter> child = nil;
GTM_FOREACH_OBJECT(child, self) {
if ([child conformsToProtocol:@protocol(GTMLogWriter)])
[child logMessage:msg level:level];
}
}
}
@end // GTMArrayCompositeLogWriter
@implementation GTMLogger (GTMLoggerLogWriter)
- (void)logMessage:(NSString *)msg level:(GTMLoggerLevel)level {
switch (level) {
case kGTMLoggerLevelDebug:
[self logDebug:@"%@", msg];
break;
case kGTMLoggerLevelInfo:
[self logInfo:@"%@", msg];
break;
case kGTMLoggerLevelError:
[self logError:@"%@", msg];
break;
case kGTMLoggerLevelAssert:
[self logAssert:@"%@", msg];
break;
default:
// Ignore the message.
break;
}
}
@end // GTMLoggerLogWriter
@implementation GTMLogBasicFormatter
- (NSString *)prettyNameForFunc:(NSString *)func {
NSString *name = [func stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSString *function = @"(unknown)";
if ([name length]) {
if (// Objective C __func__ and __PRETTY_FUNCTION__
[name hasPrefix:@"-["] || [name hasPrefix:@"+["] ||
// C++ __PRETTY_FUNCTION__ and other preadorned formats
[name hasSuffix:@")"]) {
function = name;
} else {
// Assume C99 __func__
function = [NSString stringWithFormat:@"%@()", name];
}
}
return function;
}
- (NSString *)stringForFunc:(NSString *)func
withFormat:(NSString *)fmt
valist:(va_list)args
level:(GTMLoggerLevel)level {
// Performance note: We may want to do a quick check here to see if |fmt|
// contains a '%', and if not, simply return 'fmt'.
if (!(fmt && args)) return nil;
return [[[NSString alloc] initWithFormat:fmt arguments:args] autorelease];
}
@end // GTMLogBasicFormatter
@implementation GTMLogStandardFormatter
- (id)init {
if ((self = [super init])) {
dateFormatter_ = [[NSDateFormatter alloc] init];
[dateFormatter_ setFormatterBehavior:NSDateFormatterBehavior10_4];
[dateFormatter_ setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
pname_ = [[[NSProcessInfo processInfo] processName] copy];
pid_ = [[NSProcessInfo processInfo] processIdentifier];
if (!(dateFormatter_ && pname_)) {
[self release];
return nil;
}
}
return self;
}
- (void)dealloc {
[dateFormatter_ release];
[pname_ release];
[super dealloc];
}
- (NSString *)stringForFunc:(NSString *)func
withFormat:(NSString *)fmt
valist:(va_list)args
level:(GTMLoggerLevel)level {
NSString *tstamp = nil;
@synchronized (dateFormatter_) {
tstamp = [dateFormatter_ stringFromDate:[NSDate date]];
}
return [NSString stringWithFormat:@"%@ %@[%d/%p] [lvl=%d] %@ %@",
tstamp, pname_, pid_, pthread_self(),
level, [self prettyNameForFunc:func],
// |super| has guard for nil |fmt| and |args|
[super stringForFunc:func withFormat:fmt valist:args level:level]];
}
@end // GTMLogStandardFormatter
@implementation GTMLogLevelFilter
// Check the environment and the user preferences for the GTMVerboseLogging key
// to see if verbose logging has been enabled. The environment variable will
// override the defaults setting, so check the environment first.
// COV_NF_START
static BOOL IsVerboseLoggingEnabled(void) {
static NSString *const kVerboseLoggingKey = @"GTMVerboseLogging";
NSString *value = [[[NSProcessInfo processInfo] environment]
objectForKey:kVerboseLoggingKey];
if (value) {
// Emulate [NSString boolValue] for pre-10.5
value = [value stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if ([[value uppercaseString] hasPrefix:@"Y"] ||
[[value uppercaseString] hasPrefix:@"T"] ||
[value intValue]) {
return YES;
} else {
return NO;
}
}
return [[NSUserDefaults standardUserDefaults] boolForKey:kVerboseLoggingKey];
}
// COV_NF_END
// In DEBUG builds, log everything. If we're not in a debug build we'll assume
// that we're in a Release build.
- (BOOL)filterAllowsMessage:(NSString *)msg level:(GTMLoggerLevel)level {
#if defined(DEBUG) && DEBUG
return YES;
#endif
BOOL allow = YES;
switch (level) {
case kGTMLoggerLevelDebug:
allow = NO;
break;
case kGTMLoggerLevelInfo:
allow = IsVerboseLoggingEnabled();
break;
case kGTMLoggerLevelError:
allow = YES;
break;
case kGTMLoggerLevelAssert:
allow = YES;
break;
default:
allow = YES;
break;
}
return allow;
}
@end // GTMLogLevelFilter
@implementation GTMLogNoFilter
- (BOOL)filterAllowsMessage:(NSString *)msg level:(GTMLoggerLevel)level {
return YES; // Allow everything through
}
@end // GTMLogNoFilter
@implementation GTMLogAllowedLevelFilter
// Private designated initializer
- (id)initWithAllowedLevels:(NSIndexSet *)levels {
self = [super init];
if (self != nil) {
allowedLevels_ = [levels retain];
// Cap min/max level
if (!allowedLevels_ ||
// NSIndexSet is unsigned so only check the high bound, but need to
// check both first and last index because NSIndexSet appears to allow
// wraparound.
([allowedLevels_ firstIndex] > kGTMLoggerLevelAssert) ||
([allowedLevels_ lastIndex] > kGTMLoggerLevelAssert)) {
[self release];
return nil;
}
}
return self;
}
- (id)init {
// Allow all levels in default init
return [self initWithAllowedLevels:[NSIndexSet indexSetWithIndexesInRange:
NSMakeRange(kGTMLoggerLevelUnknown,
(kGTMLoggerLevelAssert - kGTMLoggerLevelUnknown + 1))]];
}
- (void)dealloc {
[allowedLevels_ release];
[super dealloc];
}
- (BOOL)filterAllowsMessage:(NSString *)msg level:(GTMLoggerLevel)level {
return [allowedLevels_ containsIndex:level];
}
@end // GTMLogAllowedLevelFilter
@implementation GTMLogMininumLevelFilter
- (id)initWithMinimumLevel:(GTMLoggerLevel)level {
return [super initWithAllowedLevels:[NSIndexSet indexSetWithIndexesInRange:
NSMakeRange(level,
(kGTMLoggerLevelAssert - level + 1))]];
}
@end // GTMLogMininumLevelFilter
@implementation GTMLogMaximumLevelFilter
- (id)initWithMaximumLevel:(GTMLoggerLevel)level {
return [super initWithAllowedLevels:[NSIndexSet indexSetWithIndexesInRange:
NSMakeRange(kGTMLoggerLevelUnknown, level + 1)]];
}
@end // GTMLogMaximumLevelFilter
#if !defined(__clang__) && (__GNUC__*10+__GNUC_MINOR__ >= 42)
// See comment at top of file.
#pragma GCC diagnostic error "-Wmissing-format-attribute"
#endif // !__clang__