void kqueue_monitor::initialize_kqueue()
{
if (kq != -1) throw libfsw_exception(_("kqueue already running."));
kq = kqueue();
if (kq == -1)
{
perror("kqueue()");
throw libfsw_exception(_("kqueue failed."));
}
}
fsw_event_flag event::get_event_flag_by_name(const string &name)
{
#define FSW_MAKE_PAIR_FROM_NAME(p) {#p, p}
static const map<string, fsw_event_flag> flag_by_names = {
FSW_MAKE_PAIR_FROM_NAME(NoOp),
FSW_MAKE_PAIR_FROM_NAME(PlatformSpecific),
FSW_MAKE_PAIR_FROM_NAME(Created),
FSW_MAKE_PAIR_FROM_NAME(Updated),
FSW_MAKE_PAIR_FROM_NAME(Removed),
FSW_MAKE_PAIR_FROM_NAME(Renamed),
FSW_MAKE_PAIR_FROM_NAME(OwnerModified),
FSW_MAKE_PAIR_FROM_NAME(AttributeModified),
FSW_MAKE_PAIR_FROM_NAME(MovedFrom),
FSW_MAKE_PAIR_FROM_NAME(MovedTo),
FSW_MAKE_PAIR_FROM_NAME(IsFile),
FSW_MAKE_PAIR_FROM_NAME(IsDir),
FSW_MAKE_PAIR_FROM_NAME(IsSymLink),
FSW_MAKE_PAIR_FROM_NAME(Link),
FSW_MAKE_PAIR_FROM_NAME(Overflow)
};
#undef FSW_MAKE_PAIR_FROM_NAME
auto flag = flag_by_names.find(name);
if (flag == flag_by_names.end())
throw libfsw_exception(_("Unknown event type: ") + name, FSW_ERR_UNKNOWN_VALUE);
return flag->second;
}
void fsevents_monitor::fsevents_callback(ConstFSEventStreamRef streamRef,
void *clientCallBackInfo,
size_t numEvents,
void *eventPaths,
const FSEventStreamEventFlags eventFlags[],
const FSEventStreamEventId eventIds[])
{
fsevents_monitor *fse_monitor =
static_cast<fsevents_monitor *> (clientCallBackInfo);
if (!fse_monitor)
{
throw libfsw_exception(_("The callback info cannot be cast to fsevents_monitor."));
}
vector<event> events;
time_t curr_time;
time(&curr_time);
for (size_t i = 0; i < numEvents; ++i)
{
events.push_back({((char **) eventPaths)[i], curr_time, decode_flags(eventFlags[i])});
}
if (events.size() > 0)
{
fse_monitor->notify_events(events);
}
}
string event::get_event_flag_name(const fsw_event_flag &flag)
{
#define FSW_MAKE_PAIR_FROM_NAME(p) {p, #p}
static const map<fsw_event_flag, string> names_by_flag = {
FSW_MAKE_PAIR_FROM_NAME(NoOp),
FSW_MAKE_PAIR_FROM_NAME(PlatformSpecific),
FSW_MAKE_PAIR_FROM_NAME(Created),
FSW_MAKE_PAIR_FROM_NAME(Updated),
FSW_MAKE_PAIR_FROM_NAME(Removed),
FSW_MAKE_PAIR_FROM_NAME(Renamed),
FSW_MAKE_PAIR_FROM_NAME(OwnerModified),
FSW_MAKE_PAIR_FROM_NAME(AttributeModified),
FSW_MAKE_PAIR_FROM_NAME(MovedFrom),
FSW_MAKE_PAIR_FROM_NAME(MovedTo),
FSW_MAKE_PAIR_FROM_NAME(IsFile),
FSW_MAKE_PAIR_FROM_NAME(IsDir),
FSW_MAKE_PAIR_FROM_NAME(IsSymLink),
FSW_MAKE_PAIR_FROM_NAME(Link),
FSW_MAKE_PAIR_FROM_NAME(Overflow)
};
#undef FSW_MAKE_PAIR_FROM_NAME
auto name = names_by_flag.find(flag);
if (name == names_by_flag.end())
throw libfsw_exception(_("Unknown event type."), FSW_ERR_UNKNOWN_VALUE);
return name->second;
}
void monitor::set_latency(double latency)
{
if (latency < 0)
{
throw libfsw_exception(_("Latency cannot be negative."), FSW_ERR_INVALID_LATENCY);
}
this->latency = latency;
}
void monitor::notify_overflow(const std::string& path) const
{
if (!allow_overflow) throw libfsw_exception(_("Event queue overflow."));
time_t curr_time;
time(&curr_time);
notify_events({{path, curr_time, {fsw_event_flag::Overflow}}});
}
monitor::monitor(std::vector<std::string> paths,
FSW_EVENT_CALLBACK * callback,
void * context) :
paths(paths), callback(callback), context(context)
{
if (callback == nullptr)
{
throw libfsw_exception(_("Callback cannot be null."), FSW_ERR_CALLBACK_NOT_SET);
}
}
void fsevents_monitor::run()
{
if (stream) return;
// parsing paths
vector<CFStringRef> dirs;
for (string path : paths)
{
dirs.push_back(CFStringCreateWithCString(NULL,
path.c_str(),
kCFStringEncodingUTF8));
}
if (dirs.size() == 0) return;
CFArrayRef pathsToWatch =
CFArrayCreate(NULL,
reinterpret_cast<const void **> (&dirs[0]),
dirs.size(),
&kCFTypeArrayCallBacks);
FSEventStreamContext *context = new FSEventStreamContext();
context->version = 0;
context->info = this;
context->retain = nullptr;
context->release = nullptr;
context->copyDescription = nullptr;
FSW_ELOG(_("Creating FSEvent stream...\n"));
unique_lock<mutex> run_loop_lock(run_mutex);
stream = FSEventStreamCreate(NULL,
&fsevents_monitor::fsevents_callback,
context,
pathsToWatch,
kFSEventStreamEventIdSinceNow,
latency,
kFSEventStreamCreateFlagFileEvents);
if (!stream) throw libfsw_exception(_("Event stream could not be created."));
run_loop = CFRunLoopGetCurrent();
run_loop_lock.unlock();
FSW_ELOG(_("Scheduling stream with run loop...\n"));
FSEventStreamScheduleWithRunLoop(stream,
run_loop,
kCFRunLoopDefaultMode);
FSW_ELOG(_("Starting event stream...\n"));
FSEventStreamStart(stream);
FSW_ELOG(_("Starting run loop...\n"));
CFRunLoopRun();
}
void fsevents_monitor::on_stop()
{
lock_guard<mutex> run_loop_lock(run_mutex);
if (!run_loop) throw libfsw_exception(_("run loop is null"));
FSW_ELOG(_("Stopping event stream...\n"));
FSEventStreamStop(stream);
stream = nullptr;
FSW_ELOG(_("Stopping run loop...\n"));
CFRunLoopStop(run_loop);
run_loop = nullptr;
}
monitor * monitor::create_monitor(fsw_monitor_type type,
std::vector<std::string> paths,
FSW_EVENT_CALLBACK * callback,
void * context)
{
switch (type)
{
case system_default_monitor_type:
return monitor::create_default_monitor(paths, callback, context);
case fsevents_monitor_type:
#if defined(HAVE_FSEVENTS_FILE_EVENTS)
return new fsevents_monitor(paths, callback, context);
#else
throw libfsw_exception("Unsupported monitor.", FSW_ERR_UNKNOWN_MONITOR_TYPE);
#endif
case kqueue_monitor_type:
#if defined(HAVE_SYS_EVENT_H)
return new kqueue_monitor(paths, callback, context);
#else
throw libfsw_exception("Unsupported monitor.", FSW_ERR_UNKNOWN_MONITOR_TYPE);
#endif
case inotify_monitor_type:
#if defined(HAVE_SYS_INOTIFY_H)
return new inotify_monitor(paths, callback, context);
#else
throw libfsw_exception("Unsupported monitor.", FSW_ERR_UNKNOWN_MONITOR_TYPE);
#endif
case poll_monitor_type:
return new poll_monitor(paths, callback, context);
default:
throw libfsw_exception("Unsupported monitor.", FSW_ERR_UNKNOWN_MONITOR_TYPE);
}
}
inotify_monitor::inotify_monitor(vector<string> paths_to_monitor,
FSW_EVENT_CALLBACK * callback,
void * context) :
monitor(paths_to_monitor, callback, context),
impl(new inotify_monitor_impl())
{
impl->inotify_monitor_handle = inotify_init();
if (impl->inotify_monitor_handle == -1)
{
perror("inotify_init");
throw libfsw_exception(_("Cannot initialize inotify."));
}
}
void monitor::add_filter(const monitor_filter &filter)
{
regex_t regex;
int flags = 0;
if (!filter.case_sensitive) flags |= REG_ICASE;
if (filter.extended) flags |= REG_EXTENDED;
if (::regcomp(®ex, filter.text.c_str(), flags))
{
string err = _("An error occurred during the compilation of ") + filter.text;
throw libfsw_exception(err, FSW_ERR_INVALID_REGEX);
}
this->filters.push_back({regex, filter.type});
}
monitor::monitor(std::vector<std::string> paths,
FSW_EVENT_CALLBACK *callback,
void *context) :
paths(std::move(paths)), callback(callback), context(context), latency(1)
{
if (callback == nullptr)
{
throw libfsw_exception(_("Callback cannot be null."),
FSW_ERR_CALLBACK_NOT_SET);
}
#ifdef HAVE_INACTIVITY_CALLBACK
milliseconds epoch =
duration_cast<milliseconds>(system_clock::now().time_since_epoch());
last_notification.store(epoch);
#endif
}
monitor *monitor_factory::create_monitor(fsw_monitor_type type,
std::vector<std::string> paths,
FSW_EVENT_CALLBACK *callback,
void *context)
{
switch (type)
{
case system_default_monitor_type:
return create_default_monitor(paths, callback, context);
default:
auto c = creators_by_type().find(type);
if (c == creators_by_type().end())
throw libfsw_exception("Unsupported monitor.",
FSW_ERR_UNKNOWN_MONITOR_TYPE);
return c->second(paths, callback, context);
}
}
int kqueue_monitor::wait_for_events(const vector<struct kevent>& changes,
vector<struct kevent>& event_list)
{
struct timespec ts = create_timespec_from_latency(latency);
int event_num = kevent(kq,
&changes[0],
(int) changes.size(),
&event_list[0],
(int) event_list.size(),
&ts);
if (event_num == -1)
{
perror("kevent");
throw libfsw_exception(_("kevent returned -1, invalid event number."));
}
return event_num;
}
void monitor::add_filter(const monitor_filter& filter)
{
std::regex::flag_type regex_flags = std::regex::basic;
if (filter.extended) regex_flags = std::regex::extended;
if (!filter.case_sensitive) regex_flags |= std::regex::icase;
try
{
this->filters.push_back({std::regex(filter.text, regex_flags),
filter.type});
}
catch (std::regex_error& error)
{
throw libfsw_exception(
string_utils::string_from_format(
_("An error occurred during the compilation of %s"),
filter.text.c_str()),
FSW_ERR_INVALID_REGEX);
}
}
void monitor::inactivity_callback(monitor *mon)
{
if (!mon) throw libfsw_exception(_("Callback argument cannot be null."));
FSW_ELOG(_("Inactivity notification thread: starting\n"));
for (;;)
{
std::unique_lock<std::mutex> run_guard(mon->run_mutex);
if (mon->should_stop) break;
run_guard.unlock();
milliseconds elapsed =
duration_cast<milliseconds>(system_clock::now().time_since_epoch())
- mon->last_notification.load();
// Sleep and loop again if sufficient time has not elapsed yet.
if (elapsed < mon->get_latency_ms())
{
milliseconds to_sleep = mon->get_latency_ms() - elapsed;
seconds max_sleep_time(2);
std::this_thread::sleep_for(
to_sleep > max_sleep_time ? max_sleep_time : to_sleep);
continue;
}
// Build a fake event.
time_t curr_time;
time(&curr_time);
std::vector<event> events;
events.push_back({"", curr_time, {NoOp}});
mon->notify_events(events);
}
FSW_ELOG(_("Inactivity notification thread: exiting\n"));
}
void inotify_monitor::run()
{
char buffer[BUFFER_SIZE];
while (true)
{
process_pending_events();
scan_root_paths();
// If no files can be watched, sleep and repeat the loop.
if (!impl->watched_descriptors.size())
{
sleep(latency);
continue;
}
// Use select to timeout on file descriptor read the amount specified by
// the monitor latency. This way, the monitor has a chance to update its
// watches with at least the periodicity expected by the user.
fd_set set;
struct timeval timeout;
FD_ZERO(&set);
FD_SET(impl->inotify_monitor_handle, &set);
double sec;
double frac = modf(this->latency, &sec);
timeout.tv_sec = sec;
timeout.tv_usec = 1000 * 1000 * frac;
int rv = select(impl->inotify_monitor_handle + 1,
&set,
nullptr,
nullptr,
&timeout);
if (rv == -1)
{
throw libfsw_exception(_("::select() on inotify descriptor encountered an error."));
}
// In case of read timeout just repeat the loop.
if (rv == 0)
{
continue;
}
ssize_t record_num = read(impl->inotify_monitor_handle,
buffer,
BUFFER_SIZE);
{
ostringstream log;
log << _("Number of records: ") << record_num << "\n";
FSW_ELOG(log.str().c_str());
}
if (!record_num)
{
throw libfsw_exception(_("read() on inotify descriptor read 0 records."));
}
if (record_num == -1)
{
perror("read()");
throw libfsw_exception(_("read() on inotify descriptor returned -1."));
}
time(&impl->curr_time);
for (char *p = buffer; p < buffer + record_num;)
{
struct inotify_event * event = reinterpret_cast<struct inotify_event *> (p);
preprocess_event(event);
p += (sizeof (struct inotify_event)) + event->len;
}
if (impl->events.size())
{
notify_events(impl->events);
impl->events.clear();
}
sleep(latency);
}
}
