jens@20: //
jens@20: //  MYDirectoryWatcher.m
jens@20: //  Murky
jens@20: //
jens@20: //  Copyright 2008 Jens Alfke. All rights reserved.
jens@20: //
jens@20: 
jens@20: #import "MYDirectoryWatcher.h"
jens@27: #import "Test.h"
jens@27: #import "Logging.h"
jens@20: #import <CoreServices/CoreServices.h>
jens@20: 
jens@20: 
jens@20: static void directoryWatcherCallback(ConstFSEventStreamRef streamRef,
jens@20:                                      void *clientCallBackInfo,
jens@20:                                      size_t numEvents,
jens@20:                                      void *eventPaths,
jens@20:                                      const FSEventStreamEventFlags eventFlags[],
jens@20:                                      const FSEventStreamEventId eventIds[]);
jens@20: 
jens@20: @interface MYDirectoryEvent ()
jens@20: - (id) _initWithWatcher: (MYDirectoryWatcher*)itsWatcher
jens@20:                    path: (NSString*)itsPath 
jens@20:                   flags: (FSEventStreamEventFlags)itsFlags
jens@20:                 eventID: (FSEventStreamEventId)itsEventID;
jens@20: @end
jens@20: 
jens@20: 
jens@20: @implementation MYDirectoryWatcher
jens@20: 
jens@20: 
jens@20: - (id) initWithDirectory: (NSString*)path target: (id)target action: (SEL)action
jens@20: {
jens@27:     Assert(path!=nil);
jens@20:     self = [super init];
jens@20:     if (self != nil) {
jens@20:         _path = path.copy;
jens@20:         _target = target;
jens@20:         _action = action;
jens@20:         _latency = 5.0;
jens@20:         _lastEventID = kFSEventStreamEventIdSinceNow;
jens@20:     }
jens@20:     return self;
jens@20: }
jens@20: 
jens@20: - (void) dealloc
jens@20: {
jens@20:     [self stop];
jens@20:     [_path release];
jens@20:     [super dealloc];
jens@20: }
jens@20: 
jens@20: - (void) finalize
jens@20: {
jens@20:     [self stop];
jens@20:     [super finalize];
jens@20: }
jens@20: 
jens@20: 
jens@20: @synthesize path=_path, latency=_latency, lastEventID=_lastEventID;
jens@20: 
jens@20: 
jens@20: - (BOOL) start
jens@20: {
jens@20:     if( ! _stream ) {
jens@20:         FSEventStreamContext context = {0,self,NULL,NULL,NULL};
jens@20:         _stream = FSEventStreamCreate(NULL, 
jens@20:                                       &directoryWatcherCallback, &context,
jens@20:                                       (CFArrayRef)[NSArray arrayWithObject: _path], 
jens@20:                                       _lastEventID, 
jens@20:                                       _latency, 
jens@20:                                       kFSEventStreamCreateFlagUseCFTypes);
jens@20:         if( ! _stream )
jens@20:             return NO;
jens@20:         FSEventStreamScheduleWithRunLoop(_stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
jens@20:         if( ! FSEventStreamStart(_stream) ) {
jens@20:             [self stop];
jens@20:             return NO;
jens@20:         }
jens@20:         _historyDone = (_lastEventID == kFSEventStreamEventIdSinceNow);
jens@27:         LogTo(MYDirectoryWatcher, @"Started on %@ (latency=%g, lastEvent=%llu)",_path,_latency,_lastEventID);
jens@20:     }
jens@20:     return YES;
jens@20: }
jens@20: 
jens@20: - (void) pause
jens@20: {
jens@20:     if( _stream ) {
jens@20:         FSEventStreamStop(_stream);
jens@20:         FSEventStreamInvalidate(_stream);
jens@20:         FSEventStreamRelease(_stream);
jens@20:         _stream = NULL;
jens@27:         LogTo(MYDirectoryWatcher, @"Stopped on %@ (lastEvent=%llu)",_path,_lastEventID);
jens@20:     }
jens@20: }
jens@20: 
jens@20: - (void) stop
jens@20: {
jens@20:     [self pause];
jens@20:     _lastEventID = kFSEventStreamEventIdSinceNow;   // so events from now till next start will be dropped
jens@20:     [NSObject cancelPreviousPerformRequestsWithTarget: self selector: @selector(start) object: nil];
jens@20: }
jens@20: 
jens@20: - (void) stopTemporarily
jens@20: {
jens@20:     if( _stream ) {
jens@20:         [self stop];
jens@20:         [self performSelector: @selector(start) withObject: nil afterDelay: 0.0];
jens@20:     }
jens@20: }
jens@20: 
jens@20: 
jens@20: - (void) _notifyEvents: (size_t)numEvents
jens@20:                  paths: (NSArray*)paths
jens@20:                  flags: (const FSEventStreamEventFlags[])eventFlags
jens@20:               eventIDs: (const FSEventStreamEventId[])eventIDs
jens@20: {
jens@20:     for (size_t i=0; i<numEvents; i++) {
jens@20:         NSString *path = [paths objectAtIndex: i];
jens@20:         FSEventStreamEventFlags flags = eventFlags[i];
jens@20:         FSEventStreamEventId eventID = eventIDs[i];
jens@20:         if( flags & (kFSEventStreamEventFlagMount | kFSEventStreamEventFlagUnmount) ) {
jens@20:             if( flags & kFSEventStreamEventFlagMount )
jens@27:                 LogTo(MYDirectoryWatcher, @"Volume mounted: %@",path);
jens@20:             else
jens@27:                 LogTo(MYDirectoryWatcher, @"Volume unmounted: %@",path);
jens@20:         } else if( flags & kFSEventStreamEventFlagHistoryDone ) {
jens@27:             LogTo(MYDirectoryWatcher, @"Event #%llu History done",eventID);
jens@20:             _historyDone = YES;
jens@20:         } else {
jens@27:             LogTo(MYDirectoryWatcher, @"Event #%llu flags=%02x path=%@",eventID,flags,path);
jens@20:             if( _historyDone )
jens@20:                 flags |= kFSEventStreamEventFlagHistoryDone;
jens@20:             
jens@20:             MYDirectoryEvent *event = [[MYDirectoryEvent alloc] _initWithWatcher: self
jens@20:                                                                         path: path 
jens@20:                                                                        flags: flags
jens@20:                                                                      eventID: eventID];
jens@20:             [_target performSelector: _action withObject: event];
jens@20:             [event release];
jens@20:         }
jens@20:         _lastEventID = eventIDs[i];
jens@20:     }
jens@20: }
jens@20: 
jens@20: 
jens@20: static void directoryWatcherCallback(ConstFSEventStreamRef streamRef,
jens@20:                                      void *watcher,
jens@20:                                      size_t numEvents,
jens@20:                                      void *eventPaths,
jens@20:                                      const FSEventStreamEventFlags eventFlags[],
jens@20:                                      const FSEventStreamEventId eventIDs[])
jens@20: {
jens@20:     [(MYDirectoryWatcher*)watcher _notifyEvents: numEvents
jens@20:                                           paths: (NSArray*)eventPaths
jens@20:                                           flags: eventFlags
jens@20:                                        eventIDs: eventIDs];
jens@20: }
jens@20: 
jens@20: 
jens@20: 
jens@20: @end
jens@20: 
jens@20: 
jens@20: 
jens@20: 
jens@20: @implementation MYDirectoryEvent
jens@20: 
jens@20: - (id) _initWithWatcher: (MYDirectoryWatcher*)itsWatcher
jens@20:                    path: (NSString*)itsPath 
jens@20:                   flags: (FSEventStreamEventFlags)itsFlags
jens@20:                 eventID: (FSEventStreamEventId)itsEventID
jens@20: {
jens@20:     self = [super init];
jens@20:     if (self != nil) {
jens@20:         watcher = itsWatcher;
jens@20:         path = itsPath.copy;
jens@20:         flags = itsFlags;
jens@20:         eventID = itsEventID;
jens@20:     }
jens@20:     return self;
jens@20: }
jens@20: 
jens@20: - (void) dealloc
jens@20: {
jens@20:     [path release];
jens@20:     [super dealloc];
jens@20: }
jens@20: 
jens@20: @synthesize watcher,path,flags,eventID;
jens@20: 
jens@20: - (NSString*) relativePath
jens@20: {
oscherler@30:     NSString *base = [watcher.path stringByStandardizingPath];
oscherler@30:     NSString *standardizedPath = [path stringByStandardizingPath];
oscherler@30:     if( ! [standardizedPath hasPrefix: base] )
jens@20:         return nil;
jens@27:     unsigned length = base.length;
oscherler@30:     while( length < standardizedPath.length && [standardizedPath characterAtIndex: length]=='/' )
jens@20:         length++;
oscherler@30:     return [standardizedPath substringFromIndex: length];
jens@20: }
jens@20: 
jens@20: - (BOOL) mustScanSubdirectories     {return (flags & kFSEventStreamEventFlagMustScanSubDirs) != 0;}
jens@20: - (BOOL) eventsWereDropped          {return (flags & (kFSEventStreamEventFlagUserDropped|kFSEventStreamEventFlagKernelDropped)) != 0;}
jens@20: - (BOOL) isHistorical               {return (flags & kFSEventStreamEventFlagHistoryDone)==0;}
jens@20: - (BOOL) rootChanged                {return (flags & kFSEventStreamEventFlagRootChanged)!=0;}
jens@20: 
jens@20: @end