ClientInternal: move class Client to Client.hxx

Publish the Client API, preparing to move more code into the Client
class.

src/Client.hxx

@@ -20,15 +20,103 @@
 #ifndef MPD_CLIENT_H
 #define MPD_CLIENT_H
 
+#include "check.h"
+#include "ClientMessage.hxx"
+#include "CommandListBuilder.hxx"
+#include "event/FullyBufferedSocket.hxx"
+#include "event/TimeoutMonitor.hxx"
 #include "Compiler.h"
 
+#include <set>
+#include <string>
+#include <list>
+
 #include <stddef.h>
 #include <stdarg.h>
 
 struct sockaddr;
 class EventLoop;
 struct Partition;
-class Client;
+
+class Client final : private FullyBufferedSocket, TimeoutMonitor {
+public:
+	Partition &partition;
+	struct playlist &playlist;
+	struct player_control &player_control;
+
+	unsigned permission;
+
+	/** the uid of the client process, or -1 if unknown */
+	int uid;
+
+	CommandListBuilder cmd_list;
+
+	unsigned int num;	/* client number */
+
+	/** is this client waiting for an "idle" response? */
+	bool idle_waiting;
+
+	/** idle flags pending on this client, to be sent as soon as
+	    the client enters "idle" */
+	unsigned idle_flags;
+
+	/** idle flags that the client wants to receive */
+	unsigned idle_subscriptions;
+
+	/**
+	 * A list of channel names this client is subscribed to.
+	 */
+	std::set<std::string> subscriptions;
+
+	/**
+	 * The number of subscriptions in #subscriptions.  Used to
+	 * limit the number of subscriptions.
+	 */
+	unsigned num_subscriptions;
+
+	/**
+	 * A list of messages this client has received.
+	 */
+	std::list<ClientMessage> messages;
+
+	Client(EventLoop &loop, Partition &partition,
+	       int fd, int uid, int num);
+
+	bool IsConnected() const {
+		return FullyBufferedSocket::IsDefined();
+	}
+
+	gcc_pure
+	bool IsSubscribed(const char *channel_name) const {
+		return subscriptions.find(channel_name) != subscriptions.end();
+	}
+
+	gcc_pure
+	bool IsExpired() const {
+		return !FullyBufferedSocket::IsDefined();
+	}
+
+	void Close();
+	void SetExpired();
+
+	using FullyBufferedSocket::Write;
+
+	/**
+	 * Send "idle" response to this client.
+	 */
+	void IdleNotify();
+	void IdleAdd(unsigned flags);
+	bool IdleWait(unsigned flags);
+
+private:
+	/* virtual methods from class BufferedSocket */
+	virtual InputResult OnSocketInput(void *data, size_t length) override;
+	virtual void OnSocketError(Error &&error) override;
+	virtual void OnSocketClosed() override;
+
+	/* virtual methods from class TimeoutMonitor */
+	virtual void OnTimeout() override;
+};
 
 void client_manager_init(void);