From c3a1946675855b299a2b36550cdf2c2f69d153aa Mon Sep 17 00:00:00 2001
From: "Javier S. Pedro" <maemo@javispedro.com>
Date: Mon, 17 Sep 2012 23:03:03 +0200
Subject: initial import

---
 distfoldd/watcher.cc | 132 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 distfoldd/watcher.cc

(limited to 'distfoldd/watcher.cc')

diff --git a/distfoldd/watcher.cc b/distfoldd/watcher.cc
new file mode 100644
index 0000000..664ea58
--- /dev/null
+++ b/distfoldd/watcher.cc
@@ -0,0 +1,132 @@
+#include <QtCore/QDebug>
+
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <sys/inotify.h>
+
+#include "watcher.h"
+
+
+Watcher::Watcher(const QString& path, QObject *parent) :
+    QObject(parent)
+{
+	_fd = inotify_init();
+	fcntl(_fd, F_SETFL, O_NONBLOCK);
+	_buffer.resize(sizeof(struct inotify_event) + NAME_MAX + 1);
+	_mask = IN_CLOSE_WRITE | IN_CREATE | IN_DELETE |
+	        IN_MOVED_FROM | IN_MOVED_TO | IN_ONLYDIR;
+
+	_notifier = new QSocketNotifier(_fd, QSocketNotifier::Read, this);
+	connect(_notifier, SIGNAL(activated(int)), SLOT(readInotify()));
+
+	QStringList l = scanDirs(QDir(path));
+	foreach (const QString& s, l) {
+		addWatch(s);
+	}
+}
+
+void Watcher::readInotify()
+{
+	inotify_event *event;
+	const ssize_t struct_size = sizeof(struct inotify_event);
+	ssize_t pos, nread;
+
+	do {
+		nread = read(_fd, _buffer.data(), _buffer.size());
+		if (nread < 0) {
+			int err = errno;
+			if (err == EWOULDBLOCK) return;
+			qWarning() << "Error while reading from inotify" << err;
+		}
+
+		pos = 0;
+		while (pos + struct_size <= nread) {
+			event = reinterpret_cast<inotify_event*>(&(_buffer.data()[pos]));
+			if (event->wd == -1) {
+				// Special treatment
+				// TODO
+				continue;
+			}
+
+			QString path = _watches[event->wd];
+			QString name;
+			QString filePath = path;
+			if (event->len > 0) {
+				name = QString::fromLocal8Bit(event->name);
+				filePath += "/" + name;
+			}
+
+			if (event->mask & (IN_CREATE|IN_MOVED_TO)) {
+				if (event->mask & IN_ISDIR) {
+					// TODO There might already be folders in here.
+					addWatch(filePath);
+				}
+				emit pathAdded(filePath);
+			}
+			if (event->mask & IN_CLOSE_WRITE) {
+				emit pathChanged(filePath);
+			}
+			if (event->mask & (IN_MOVED_FROM|IN_DELETE)) {
+				if (event->mask & IN_ISDIR) {
+					removeWatch(filePath);
+				}
+				emit pathRemoved(filePath);
+			}
+
+			pos += struct_size + event->len;
+		}
+	} while (nread > 0);
+}
+
+QStringList Watcher::scanDirs(const QDir &dir)
+{
+	Q_ASSERT(dir.isReadable());
+	QStringList l(dir.absolutePath());
+	QStringList sub_dirs = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
+
+	foreach (const QString& s, sub_dirs) {
+		const QString abs_path = dir.absoluteFilePath(s);
+		l << scanDirs(QDir(abs_path));
+	}
+
+	return l;
+}
+
+void Watcher::addWatch(const QString& path)
+{
+	int wd = inotify_add_watch(_fd, path.toLocal8Bit().constData(), _mask);
+	if (wd == -1) {
+		qWarning() << "Failed to add watch for" << path;
+		return;
+	}
+	if (_watches.contains(wd)) {
+		qWarning() << "Watch for" << path << "was already setup";
+		return;
+	}
+
+	qDebug() << "Watching" << path;
+	_watches[wd] = path;
+	_dirs[path] = wd;
+}
+
+void Watcher::removeWatch(const QString& path)
+{
+	if (!_dirs.contains(path)) {
+		qWarning() << "Watch for" << path << "not found";
+		return;
+	}
+	int wd = _dirs[path];
+	removeWatch(wd);
+}
+
+void Watcher::removeWatch(int wd)
+{
+	if (!_watches.contains(wd)) {
+		qWarning() << "Watch" << wd << "not found";
+	}
+	QString path = _watches[wd];
+	qDebug() << "Unwatching" << path;
+	inotify_rm_watch(_fd, wd);
+	_dirs.remove(path);
+	_watches.remove(wd);
+}
-- 
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