input/nfs: use the asynchronous libnfs API

More robust and cancellable.

1 files changed, 94 insertions, 0 deletions

diff --git a/src/lib/nfs/FileReader.hxx b/src/lib/nfs/FileReader.hxx
new file mode 100644
index 000000000..7f43e0ecf
--- /dev/null
+++ b/src/lib/nfs/FileReader.hxx
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_NFS_FILE_READER_HXX
+#define MPD_NFS_FILE_READER_HXX
+
+#include "check.h"
+#include "Lease.hxx"
+#include "Callback.hxx"
+#include "event/DeferredMonitor.hxx"
+
+#include <string>
+
+#include <stdint.h>
+#include <stddef.h>
+#include <sys/stat.h>
+
+struct nfsfh;
+class NfsConnection;
+
+class NfsFileReader : NfsLease, NfsCallback, DeferredMonitor {
+	enum class State {
+		INITIAL,
+		DEFER,
+		MOUNT,
+		OPEN,
+		STAT,
+		READ,
+		IDLE,
+	};
+
+	State state;
+
+	std::string server, export_name;
+	const char *path;
+
+	NfsConnection *connection;
+
+	nfsfh *fh;
+
+public:
+	NfsFileReader();
+	~NfsFileReader();
+
+	void Close();
+	void DeferClose();
+
+	bool Open(const char *uri, Error &error);
+	bool Read(uint64_t offset, size_t size, Error &error);
+	void CancelRead();
+
+	bool IsIdle() const {
+		return state == State::IDLE;
+	}
+
+protected:
+	virtual void OnNfsFileOpen(uint64_t size) = 0;
+	virtual void OnNfsFileRead(const void *data, size_t size) = 0;
+	virtual void OnNfsFileError(Error &&error) = 0;
+
+private:
+	void OpenCallback(nfsfh *_fh);
+	void StatCallback(const struct stat *st);
+
+	/* virtual methods from NfsLease */
+	void OnNfsConnectionReady() final;
+	void OnNfsConnectionFailed(const Error &error) final;
+	void OnNfsConnectionDisconnected(const Error &error) final;
+
+	/* virtual methods from NfsCallback */
+	void OnNfsCallback(unsigned status, void *data) final;
+	void OnNfsError(Error &&error) final;
+
+	/* virtual methods from DeferredMonitor */
+	void RunDeferred() final;
+};
+
+#endif