402 lines
12 KiB
Matlab
402 lines
12 KiB
Matlab
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//
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// DDLogFileInfo.m
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// NVLogManagerDemo
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//
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// Created by cxb on 2023/5/10.
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// Copyright © 2023 com.zhouxi. All rights reserved.
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//
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#import "DDLogFileInfo.h"
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static NSString * const kDDXAttrArchivedName = @"guru.log.archived";
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@interface DDLogFileInfo () {
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__strong NSString *_filePath;
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__strong NSString *_fileName;
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__strong NSDictionary *_fileAttributes;
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__strong NSDate *_creationDate;
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__strong NSDate *_modificationDate;
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unsigned long long _fileSize;
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}
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#if TARGET_IPHONE_SIMULATOR
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// Old implementation of extended attributes on the simulator.
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- (BOOL)_hasExtensionAttributeWithName:(NSString *)attrName;
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- (void)_removeExtensionAttributeWithName:(NSString *)attrName;
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#endif
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@end
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@implementation DDLogFileInfo
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@synthesize filePath;
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@dynamic fileName;
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@dynamic fileAttributes;
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@dynamic creationDate;
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@dynamic modificationDate;
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@dynamic fileSize;
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@dynamic age;
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@dynamic isArchived;
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#pragma mark Lifecycle
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+ (instancetype)logFileWithPath:(NSString *)aFilePath {
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if (!aFilePath) return nil;
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return [[self alloc] initWithFilePath:aFilePath];
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}
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- (instancetype)initWithFilePath:(NSString *)aFilePath {
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NSParameterAssert(aFilePath);
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if ((self = [super init])) {
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filePath = [aFilePath copy];
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}
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return self;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Standard Info
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (NSDictionary *)fileAttributes {
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if (_fileAttributes == nil && filePath != nil) {
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__autoreleasing NSError *error = nil;
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_fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:&error];
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if (!_fileAttributes) {
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NSLogError(@"DDLogFileInfo: Failed to read file attributes: %@", error);
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}
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}
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return _fileAttributes ?: @{};
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}
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- (NSString *)fileName {
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if (_fileName == nil) {
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_fileName = [filePath lastPathComponent];
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}
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return _fileName;
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}
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- (NSDate *)modificationDate {
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if (_modificationDate == nil) {
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_modificationDate = self.fileAttributes[NSFileModificationDate];
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}
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return _modificationDate;
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}
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- (NSDate *)creationDate {
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if (_creationDate == nil) {
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_creationDate = self.fileAttributes[NSFileCreationDate];
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}
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return _creationDate;
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}
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- (unsigned long long)fileSize {
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if (_fileSize == 0) {
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_fileSize = [self.fileAttributes[NSFileSize] unsignedLongLongValue];
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}
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return _fileSize;
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}
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- (NSTimeInterval)age {
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return -[[self creationDate] timeIntervalSinceNow];
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}
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- (BOOL)isSymlink {
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return self.fileAttributes[NSFileType] == NSFileTypeSymbolicLink;
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}
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- (NSString *)description {
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return [@{ @"filePath": self.filePath ? : @"",
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@"fileName": self.fileName ? : @"",
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@"fileAttributes": self.fileAttributes ? : @"",
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@"creationDate": self.creationDate ? : @"",
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@"modificationDate": self.modificationDate ? : @"",
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@"fileSize": @(self.fileSize),
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@"age": @(self.age),
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@"isArchived": @(self.isArchived) } description];
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Archiving
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (BOOL)isArchived {
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return [self hasExtendedAttributeWithName:kDDXAttrArchivedName];
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}
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- (void)setIsArchived:(BOOL)flag {
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if (flag) {
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[self addExtendedAttributeWithName:kDDXAttrArchivedName];
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} else {
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[self removeExtendedAttributeWithName:kDDXAttrArchivedName];
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Changes
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (void)reset {
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_fileName = nil;
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_fileAttributes = nil;
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_creationDate = nil;
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_modificationDate = nil;
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}
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- (void)renameFile:(NSString *)newFileName {
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// This method is only used on the iPhone simulator, where normal extended attributes are broken.
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// See full explanation in the header file.
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if (![newFileName isEqualToString:[self fileName]]) {
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NSFileManager* fileManager = [NSFileManager defaultManager];
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NSString *fileDir = [filePath stringByDeletingLastPathComponent];
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NSString *newFilePath = [fileDir stringByAppendingPathComponent:newFileName];
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// We only want to assert when we're not using the simulator, as we're "archiving" a log file with this method in the sim
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// (in which case the file might not exist anymore and neither does it parent folder).
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#if defined(DEBUG) && (!defined(TARGET_IPHONE_SIMULATOR) || !TARGET_IPHONE_SIMULATOR)
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BOOL directory = NO;
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[fileManager fileExistsAtPath:fileDir isDirectory:&directory];
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NSAssert(directory, @"Containing directory must exist.");
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#endif
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__autoreleasing NSError *error = nil;
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BOOL success = [fileManager removeItemAtPath:newFilePath error:&error];
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if (!success && error.code != NSFileNoSuchFileError) {
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NSLogError(@"DDLogFileInfo: Error deleting archive (%@): %@", self.fileName, error);
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}
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success = [fileManager moveItemAtPath:filePath toPath:newFilePath error:&error];
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// When a log file is deleted, moved or renamed on the simulator, we attempt to rename it as a
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// result of "archiving" it, but since the file doesn't exist anymore, needless error logs are printed
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// We therefore ignore this error, and assert that the directory we are copying into exists (which
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// is the only other case where this error code can come up).
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#if TARGET_IPHONE_SIMULATOR
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if (!success && error.code != NSFileNoSuchFileError)
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#else
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if (!success)
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#endif
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{
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NSLogError(@"DDLogFileInfo: Error renaming file (%@): %@", self.fileName, error);
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}
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filePath = newFilePath;
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[self reset];
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Attribute Management
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#if TARGET_IPHONE_SIMULATOR
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// Old implementation of extended attributes on the simulator.
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// Extended attributes were not working properly on the simulator
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// due to misuse of setxattr() function.
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// Now that this is fixed in the new implementation, we want to keep
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// backward compatibility with previous simulator installations.
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static NSString * const kDDExtensionSeparator = @".";
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static NSString *_xattrToExtensionName(NSString *attrName) {
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static NSDictionary<NSString *, NSString *>* _xattrToExtensionNameMap;
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static dispatch_once_t _token;
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dispatch_once(&_token, ^{
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_xattrToExtensionNameMap = @{ kDDXAttrArchivedName: @"archived" };
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});
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return [_xattrToExtensionNameMap objectForKey:attrName];
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}
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- (BOOL)_hasExtensionAttributeWithName:(NSString *)attrName {
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// This method is only used on the iPhone simulator for backward compatibility reason.
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// Split the file name into components. File name may have various format, but generally
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// structure is same:
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//
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// <name part>.<extension part> and <name part>.archived.<extension part>
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// or
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// <name part> and <name part>.archived
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//
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// So we want to search for the attrName in the components (ignoring the first array index).
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NSArray *components = [[self fileName] componentsSeparatedByString:kDDExtensionSeparator];
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// Watch out for file names without an extension
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for (NSUInteger i = 1; i < components.count; i++) {
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NSString *attr = components[i];
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if ([attrName isEqualToString:attr]) {
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return YES;
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}
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}
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return NO;
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}
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- (void)_removeExtensionAttributeWithName:(NSString *)attrName {
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// This method is only used on the iPhone simulator for backward compatibility reason.
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if ([attrName length] == 0) {
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return;
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}
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// Example:
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// attrName = "archived"
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//
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// "mylog.archived.txt" -> "mylog.txt"
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// "mylog.archived" -> "mylog"
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NSArray *components = [[self fileName] componentsSeparatedByString:kDDExtensionSeparator];
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NSUInteger count = [components count];
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NSUInteger estimatedNewLength = [[self fileName] length];
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NSMutableString *newFileName = [NSMutableString stringWithCapacity:estimatedNewLength];
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if (count > 0) {
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[newFileName appendString:components[0]];
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}
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BOOL found = NO;
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NSUInteger i;
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for (i = 1; i < count; i++) {
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NSString *attr = components[i];
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if ([attrName isEqualToString:attr]) {
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found = YES;
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} else {
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[newFileName appendString:kDDExtensionSeparator];
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[newFileName appendString:attr];
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}
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}
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if (found) {
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[self renameFile:newFileName];
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}
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}
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#endif /* if TARGET_IPHONE_SIMULATOR */
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- (BOOL)hasExtendedAttributeWithName:(NSString *)attrName {
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const char *path = [filePath fileSystemRepresentation];
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const char *name = [attrName UTF8String];
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BOOL hasExtendedAttribute = NO;
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char buffer[1];
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ssize_t result = getxattr(path, name, buffer, 1, 0, 0);
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// Fast path
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if (result > 0 && buffer[0] == '\1') {
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hasExtendedAttribute = YES;
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}
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// Maintain backward compatibility, but fix it for future checks
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else if (result >= 0) {
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hasExtendedAttribute = YES;
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[self addExtendedAttributeWithName:attrName];
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}
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#if TARGET_IPHONE_SIMULATOR
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else if ([self _hasExtensionAttributeWithName:_xattrToExtensionName(attrName)]) {
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hasExtendedAttribute = YES;
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[self addExtendedAttributeWithName:attrName];
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}
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#endif
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return hasExtendedAttribute;
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}
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- (void)addExtendedAttributeWithName:(NSString *)attrName {
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const char *path = [filePath fileSystemRepresentation];
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const char *name = [attrName UTF8String];
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int result = setxattr(path, name, "\1", 1, 0, 0);
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if (result < 0) {
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if (errno != ENOENT) {
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NSLogError(@"DDLogFileInfo: setxattr(%@, %@): error = %s",
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attrName,
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filePath,
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strerror(errno));
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} else {
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NSLogDebug(@"DDLogFileInfo: File does not exist in setxattr(%@, %@): error = %s",
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attrName,
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filePath,
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strerror(errno));
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}
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}
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#if TARGET_IPHONE_SIMULATOR
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else {
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[self _removeExtensionAttributeWithName:_xattrToExtensionName(attrName)];
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}
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#endif
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}
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- (void)removeExtendedAttributeWithName:(NSString *)attrName {
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const char *path = [filePath fileSystemRepresentation];
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const char *name = [attrName UTF8String];
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int result = removexattr(path, name, 0);
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if (result < 0 && errno != ENOATTR) {
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NSLogError(@"DDLogFileInfo: removexattr(%@, %@): error = %s",
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attrName,
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self.fileName,
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strerror(errno));
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}
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#if TARGET_IPHONE_SIMULATOR
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[self _removeExtensionAttributeWithName:_xattrToExtensionName(attrName)];
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma mark Comparisons
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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- (BOOL)isEqual:(id)object {
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if ([object isKindOfClass:[self class]]) {
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DDLogFileInfo *another = (DDLogFileInfo *)object;
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return [filePath isEqualToString:[another filePath]];
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}
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return NO;
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}
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- (NSUInteger)hash {
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return [filePath hash];
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}
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- (NSComparisonResult)reverseCompareByCreationDate:(DDLogFileInfo *)another {
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__auto_type us = [self creationDate];
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__auto_type them = [another creationDate];
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return [them compare:us];
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}
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- (NSComparisonResult)reverseCompareByModificationDate:(DDLogFileInfo *)another {
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__auto_type us = [self modificationDate];
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__auto_type them = [another modificationDate];
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return [them compare:us];
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}
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@end
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