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-rw-r--r--src/input/plugins/NfsInputPlugin.cxx221
1 files changed, 221 insertions, 0 deletions
diff --git a/src/input/plugins/NfsInputPlugin.cxx b/src/input/plugins/NfsInputPlugin.cxx
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+++ b/src/input/plugins/NfsInputPlugin.cxx
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+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "NfsInputPlugin.hxx"
+#include "../AsyncInputStream.hxx"
+#include "../InputPlugin.hxx"
+#include "lib/nfs/Domain.hxx"
+#include "lib/nfs/Glue.hxx"
+#include "lib/nfs/FileReader.hxx"
+#include "util/HugeAllocator.hxx"
+#include "util/StringUtil.hxx"
+#include "util/Error.hxx"
+
+extern "C" {
+#include <nfsc/libnfs.h>
+}
+
+#include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+/**
+ * Do not buffer more than this number of bytes. It should be a
+ * reasonable limit that doesn't make low-end machines suffer too
+ * much, but doesn't cause stuttering on high-latency lines.
+ */
+static const size_t NFS_MAX_BUFFERED = 512 * 1024;
+
+/**
+ * Resume the stream at this number of bytes after it has been paused.
+ */
+static const size_t NFS_RESUME_AT = 384 * 1024;
+
+class NfsInputStream final : public AsyncInputStream, NfsFileReader {
+ uint64_t next_offset;
+
+public:
+ NfsInputStream(const char *_uri,
+ Mutex &_mutex, Cond &_cond,
+ void *_buffer)
+ :AsyncInputStream(_uri, _mutex, _cond,
+ _buffer, NFS_MAX_BUFFERED,
+ NFS_RESUME_AT) {}
+
+ virtual ~NfsInputStream() {
+ DeferClose();
+ }
+
+ bool Open(Error &error) {
+ assert(!IsReady());
+
+ return NfsFileReader::Open(GetURI(), error);
+ }
+
+private:
+ bool DoRead();
+
+protected:
+ /* virtual methods from AsyncInputStream */
+ virtual void DoResume() override;
+ virtual void DoSeek(offset_type new_offset) override;
+
+private:
+ /* virtual methods from NfsFileReader */
+ void OnNfsFileOpen(uint64_t size) override;
+ void OnNfsFileRead(const void *data, size_t size) override;
+ void OnNfsFileError(Error &&error) override;
+};
+
+bool
+NfsInputStream::DoRead()
+{
+ assert(NfsFileReader::IsIdle());
+
+ int64_t remaining = size - next_offset;
+ if (remaining <= 0)
+ return true;
+
+ const size_t buffer_space = GetBufferSpace();
+ if (buffer_space == 0) {
+ Pause();
+ return true;
+ }
+
+ size_t nbytes = std::min<size_t>(std::min<uint64_t>(remaining, 32768),
+ buffer_space);
+
+ mutex.unlock();
+ Error error;
+ bool success = NfsFileReader::Read(next_offset, nbytes, error);
+ mutex.lock();
+
+ if (!success) {
+ PostponeError(std::move(error));
+ return false;
+ }
+
+ return true;
+}
+
+void
+NfsInputStream::DoResume()
+{
+ assert(NfsFileReader::IsIdle());
+
+ DoRead();
+}
+
+void
+NfsInputStream::DoSeek(offset_type new_offset)
+{
+ mutex.unlock();
+ NfsFileReader::CancelRead();
+ mutex.lock();
+
+ next_offset = offset = new_offset;
+ SeekDone();
+ DoRead();
+}
+
+void
+NfsInputStream::OnNfsFileOpen(uint64_t _size)
+{
+ const ScopeLock protect(mutex);
+
+ size = _size;
+ seekable = true;
+ next_offset = 0;
+ SetReady();
+ DoRead();
+}
+
+void
+NfsInputStream::OnNfsFileRead(const void *data, size_t data_size)
+{
+ const ScopeLock protect(mutex);
+ assert(!IsBufferFull());
+ assert(IsBufferFull() == (GetBufferSpace() == 0));
+ AppendToBuffer(data, data_size);
+
+ next_offset += data_size;
+
+ DoRead();
+}
+
+void
+NfsInputStream::OnNfsFileError(Error &&error)
+{
+ const ScopeLock protect(mutex);
+ postponed_error = std::move(error);
+
+ if (IsSeekPending())
+ SeekDone();
+ else if (!IsReady())
+ SetReady();
+}
+
+/*
+ * InputPlugin methods
+ *
+ */
+
+static InputPlugin::InitResult
+input_nfs_init(const config_param &, Error &)
+{
+ nfs_init();
+ return InputPlugin::InitResult::SUCCESS;
+}
+
+static void
+input_nfs_finish()
+{
+ nfs_finish();
+}
+
+static InputStream *
+input_nfs_open(const char *uri,
+ Mutex &mutex, Cond &cond,
+ Error &error)
+{
+ if (!StringStartsWith(uri, "nfs://"))
+ return nullptr;
+
+ void *buffer = HugeAllocate(NFS_MAX_BUFFERED);
+ if (buffer == nullptr) {
+ error.Set(nfs_domain, "Out of memory");
+ return nullptr;
+ }
+
+ NfsInputStream *is = new NfsInputStream(uri, mutex, cond, buffer);
+ if (!is->Open(error)) {
+ delete is;
+ return nullptr;
+ }
+
+ return is;
+}
+
+const InputPlugin input_plugin_nfs = {
+ "nfs",
+ input_nfs_init,
+ input_nfs_finish,
+ input_nfs_open,
+};