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authorMax Kellermann <max@duempel.org>2014-03-15 15:29:10 +0100
committerMax Kellermann <max@duempel.org>2014-06-17 03:21:25 +0200
commitc99559dbe937eba73376137ceb5551f1c55764d5 (patch)
tree0887f02b73b695adc35a30b468b1078d1ac7359f /src/lib/nfs/Connection.hxx
parent966c4244cbe0de174df1e72e917078269ec9dbb9 (diff)
downloadmpd-c99559dbe937eba73376137ceb5551f1c55764d5.tar.gz
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input/nfs: use the asynchronous libnfs API
More robust and cancellable.
Diffstat (limited to '')
-rw-r--r--src/lib/nfs/Connection.hxx160
1 files changed, 160 insertions, 0 deletions
diff --git a/src/lib/nfs/Connection.hxx b/src/lib/nfs/Connection.hxx
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+++ b/src/lib/nfs/Connection.hxx
@@ -0,0 +1,160 @@
+/*
+ * 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_CONNECTION_HXX
+#define MPD_NFS_CONNECTION_HXX
+
+#include "Lease.hxx"
+#include "Cancellable.hxx"
+#include "thread/Mutex.hxx"
+#include "event/SocketMonitor.hxx"
+#include "event/DeferredMonitor.hxx"
+#include "util/Error.hxx"
+
+#include <string>
+#include <list>
+
+struct nfs_context;
+class NfsCallback;
+
+/**
+ * An asynchronous connection to a NFS server.
+ */
+class NfsConnection : SocketMonitor, DeferredMonitor {
+ class CancellableCallback : public CancellablePointer<NfsCallback> {
+ NfsConnection &connection;
+
+ public:
+ explicit constexpr CancellableCallback(NfsCallback &_callback,
+ NfsConnection &_connection)
+ :CancellablePointer<NfsCallback>(_callback),
+ connection(_connection) {}
+
+ bool Open(nfs_context *context, const char *path, int flags,
+ Error &error);
+ bool Stat(nfs_context *context, struct nfsfh *fh,
+ Error &error);
+ bool Read(nfs_context *context, struct nfsfh *fh,
+ uint64_t offset, size_t size,
+ Error &error);
+
+ private:
+ static void Callback(int err, struct nfs_context *nfs,
+ void *data, void *private_data);
+ void Callback(int err, void *data);
+ };
+
+ std::string server, export_name;
+
+ nfs_context *context;
+
+ Mutex mutex;
+
+ typedef std::list<NfsLease *> LeaseList;
+ LeaseList new_leases, active_leases;
+
+ typedef CancellableList<NfsCallback, CancellableCallback> CallbackList;
+ CallbackList callbacks;
+
+ Error postponed_mount_error;
+
+ /**
+ * True when nfs_service() is being called. During that,
+ * nfs_client_free() is postponed, or libnfs will crash. See
+ * #postponed_destroy.
+ */
+ bool in_service;
+
+ /**
+ * True when OnSocketReady() is being called. During that,
+ * event updates are omitted.
+ */
+ bool in_event;
+
+ /**
+ * True when nfs_client_free() has been called while #in_service
+ * was true.
+ */
+ bool postponed_destroy;
+
+ bool mount_finished;
+
+public:
+ gcc_nonnull_all
+ NfsConnection(EventLoop &_loop,
+ const char *_server, const char *_export_name)
+ :SocketMonitor(_loop), DeferredMonitor(_loop),
+ server(_server), export_name(_export_name),
+ context(nullptr) {}
+
+ ~NfsConnection();
+
+ gcc_pure
+ const char *GetServer() const {
+ return server.c_str();
+ }
+
+ gcc_pure
+ const char *GetExportName() const {
+ return export_name.c_str();
+ }
+
+ /**
+ * Ensure that the connection is established. The connection
+ * is kept up while at least one #NfsLease is registered.
+ *
+ * This method is thread-safe. However, #NfsLease's methods
+ * will be invoked from within the #EventLoop's thread.
+ */
+ void AddLease(NfsLease &lease);
+ void RemoveLease(NfsLease &lease);
+
+ bool Open(const char *path, int flags, NfsCallback &callback,
+ Error &error);
+ bool Stat(struct nfsfh *fh, NfsCallback &callback, Error &error);
+ bool Read(struct nfsfh *fh, uint64_t offset, size_t size,
+ NfsCallback &callback, Error &error);
+ void Cancel(NfsCallback &callback);
+
+ void Close(struct nfsfh *fh);
+
+protected:
+ virtual void OnNfsConnectionError(Error &&error) = 0;
+
+private:
+ void DestroyContext();
+ bool MountInternal(Error &error);
+ void BroadcastMountSuccess();
+ void BroadcastMountError(Error &&error);
+ void BroadcastError(Error &&error);
+
+ static void MountCallback(int status, nfs_context *nfs, void *data,
+ void *private_data);
+ void MountCallback(int status, nfs_context *nfs, void *data);
+
+ void ScheduleSocket();
+
+ /* virtual methods from SocketMonitor */
+ virtual bool OnSocketReady(unsigned flags) override;
+
+ /* virtual methods from DeferredMonitor */
+ virtual void RunDeferred() override;
+};
+
+#endif