Client: rebase on the new BufferedSocket class

src/Client.hxx

@@ -22,11 +22,11 @@
 
 #include "gcc.h"
 
-#include <stdbool.h>
 #include <stddef.h>
 #include <stdarg.h>
 
 struct sockaddr;
+class EventLoop;
 struct Partition;
 class Client;
 
@@ -34,7 +34,7 @@ void client_manager_init(void);
 void client_manager_deinit(void);
 
 void
-client_new(Partition &partition,
+client_new(EventLoop &loop, Partition &partition,
 	   int fd, const struct sockaddr *sa, size_t sa_length, int uid);
 
 /**

src/ClientEvent.cxx

@@ -19,92 +19,18 @@
 
 #include "config.h"
 #include "ClientInternal.hxx"
-#include "Main.hxx"
-#include "event/Loop.hxx"
 
-#include <assert.h>
-
-static gboolean
-client_out_event(G_GNUC_UNUSED GIOChannel *source, GIOCondition condition,
-		 gpointer data)
+void
+Client::OnSocketError(GError *error)
 {
-	Client *client = (Client *)data;
-
-	assert(!client->IsExpired());
-
-	if (condition != G_IO_OUT) {
-		client->SetExpired();
-		return false;
-	}
-
-	client_write_deferred(client);
+	g_warning("error on client %d: %s", num, error->message);
+	g_error_free(error);
 
-	if (client->IsExpired()) {
-		client->Close();
-		return false;
-	}
-
-	g_timer_start(client->last_activity);
-
-	if (client->output_buffer.IsEmpty()) {
-		/* done sending deferred buffers exist: schedule
-		   read */
-		client->source_id = g_io_add_watch(client->channel,
-						   GIOCondition(G_IO_IN|G_IO_ERR|G_IO_HUP),
-						   client_in_event, client);
-		return false;
-	}
-
-	/* write more */
-	return true;
+	SetExpired();
 }
 
-gboolean
-client_in_event(G_GNUC_UNUSED GIOChannel *source, GIOCondition condition,
-		gpointer data)
+void
+Client::OnSocketClosed()
 {
-	Client *client = (Client *)data;
-	enum command_return ret;
-
-	assert(!client->IsExpired());
-
-	if (condition != G_IO_IN) {
-		client->SetExpired();
-		return false;
-	}
-
-	g_timer_start(client->last_activity);
-
-	ret = client_read(client);
-	switch (ret) {
-	case COMMAND_RETURN_OK:
-	case COMMAND_RETURN_IDLE:
-	case COMMAND_RETURN_ERROR:
-		break;
-
-	case COMMAND_RETURN_KILL:
-		client->Close();
-		main_loop->Break();
-		return false;
-
-	case COMMAND_RETURN_CLOSE:
-		client->Close();
-		return false;
-	}
-
-	if (client->IsExpired()) {
-		client->Close();
-		return false;
-	}
-
-	if (!client->output_buffer.IsEmpty()) {
-		/* deferred buffers exist: schedule write */
-		client->source_id = g_io_add_watch(client->channel,
-						   GIOCondition(G_IO_OUT|G_IO_ERR|G_IO_HUP),
-						   client_out_event, client);
-		return false;
-	}
-
-	/* read more */
-	return true;
+	SetExpired();
 }

src/ClientExpire.cxx

@@ -26,18 +26,11 @@ static guint expire_source_id;
 void
 Client::SetExpired()
 {
-	if (!IsExpired())
-		client_schedule_expire();
+	if (IsExpired())
+		return;
 
-	if (source_id != 0) {
-		g_source_remove(source_id);
-		source_id = 0;
-	}
-
-	if (channel != NULL) {
-		g_io_channel_unref(channel);
-		channel = nullptr;
-	}
+	client_schedule_expire();
+	BufferedSocket::Close();
 }
 
 static void

src/ClientIdle.cxx

@@ -60,10 +60,8 @@ client_idle_add(Client *client, unsigned flags)
 
 	client->idle_flags |= flags;
 	if (client->idle_waiting
-	    && (client->idle_flags & client->idle_subscriptions)) {
+	    && (client->idle_flags & client->idle_subscriptions))
 		client_idle_notify(client);
-		client_write_output(client);
-	}
 }
 
 static void

src/ClientInternal.hxx

@@ -24,8 +24,8 @@
 #include "Client.hxx"
 #include "ClientMessage.hxx"
 #include "CommandListBuilder.hxx"
+#include "event/BufferedSocket.hxx"
 #include "command.h"
-#include "util/PeakBuffer.hxx"
 
 #include <set>
 #include <string>
@@ -42,20 +42,13 @@ enum {
 };
 
 struct Partition;
-class PeakBuffer;
 
-class Client {
+class Client final : private BufferedSocket {
 public:
 	Partition &partition;
 	struct playlist &playlist;
 	struct player_control *player_control;
 
-	GIOChannel *channel;
-	guint source_id;
-
-	/** the buffer for reading lines from the #channel */
-	struct fifo_buffer *input;
-
 	unsigned permission;
 
 	/** the uid of the client process, or -1 if unknown */
@@ -70,8 +63,6 @@ public:
 
 	unsigned int num;	/* client number */
 
-	PeakBuffer output_buffer;
-
 	/** is this client waiting for an "idle" response? */
 	bool idle_waiting;
 
@@ -98,23 +89,35 @@ public:
 	 */
 	std::list<ClientMessage> messages;
 
-	Client(Partition &partition,
+	Client(EventLoop &loop, Partition &partition,
 	       int fd, int uid, int num);
 	~Client();
 
+	bool IsConnected() const {
+		return BufferedSocket::IsDefined();
+	}
+
 	gcc_pure
 	bool IsSubscribed(const char *channel_name) const {
 		return subscriptions.find(channel_name) != subscriptions.end();
 	}
 
-
 	gcc_pure
 	bool IsExpired() const {
-		return channel == nullptr;
+		return !BufferedSocket::IsDefined();
 	}
 
 	void Close();
 	void SetExpired();
+
+	using BufferedSocket::Write;
+
+private:
+	/* virtual methods from class BufferedSocket */
+	virtual InputResult OnSocketInput(const void *data,
+					  size_t length) override;
+	virtual void OnSocketError(GError *error) override;
+	virtual void OnSocketClosed() override;
 };
 
 extern unsigned int client_max_connections;
@@ -142,9 +145,6 @@ enum command_return
 client_process_line(Client *client, char *line);
 
 void
-client_write_deferred(Client *client);
-
-void
 client_write_output(Client *client);
 
 gboolean

src/ClientNew.cxx

@@ -22,7 +22,6 @@
 #include "ClientList.hxx"
 #include "Partition.hxx"
 #include "fd_util.h"
-#include "util/fifo_buffer.h"
 extern "C" {
 #include "resolver.h"
 }
@@ -47,45 +46,27 @@ extern "C" {
 
 static const char GREETING[] = "OK MPD " PROTOCOL_VERSION "\n";
 
-Client::Client(Partition &_partition,
-	       int fd, int _uid, int _num)
-	:partition(_partition),
+Client::Client(EventLoop &_loop, Partition &_partition,
+	       int _fd, int _uid, int _num)
+	:BufferedSocket(_fd, _loop, 16384, client_max_output_buffer_size),
+	 partition(_partition),
 	 playlist(partition.playlist), player_control(&partition.pc),
-	 input(fifo_buffer_new(4096)),
 	 permission(getDefaultPermissions()),
 	 uid(_uid),
 	 last_activity(g_timer_new()),
 	 num(_num),
-	 output_buffer(16384, client_max_output_buffer_size),
 	 idle_waiting(false), idle_flags(0),
 	 num_subscriptions(0)
 {
-	assert(fd >= 0);
-
-	channel = g_io_channel_new_socket(fd);
-	/* GLib is responsible for closing the file descriptor */
-	g_io_channel_set_close_on_unref(channel, true);
-	/* NULL encoding means the stream is binary safe; the MPD
-	   protocol is UTF-8 only, but we are doing this call anyway
-	   to prevent GLib from messing around with the stream */
-	g_io_channel_set_encoding(channel, NULL, NULL);
-	/* we prefer to do buffering */
-	g_io_channel_set_buffered(channel, false);
-
-	source_id = g_io_add_watch(channel,
-				   GIOCondition(G_IO_IN|G_IO_ERR|G_IO_HUP),
-				   client_in_event, this);
 }
 
 Client::~Client()
 {
 	g_timer_destroy(last_activity);
-
-	fifo_buffer_free(input);
 }
 
 void
-client_new(Partition &partition,
+client_new(EventLoop &loop, Partition &partition,
 	   int fd, const struct sockaddr *sa, size_t sa_length, int uid)
 {
 	static unsigned int next_client_num;
@@ -124,7 +105,7 @@ client_new(Partition &partition,
 		return;
 	}
 
-	Client *client = new Client(partition, fd, uid,
+	Client *client = new Client(loop, partition, fd, uid,
 				    next_client_num++);
 
 	(void)send(fd, GREETING, sizeof(GREETING) - 1, 0);

src/ClientProcess.cxx

@@ -61,7 +61,6 @@ client_process_line(Client *client, char *line)
 			/* send empty idle response and leave idle mode */
 			client->idle_waiting = false;
 			command_success(client);
-			client_write_output(client);
 		}
 
 		/* do nothing if the client wasn't idling: the client
@@ -97,7 +96,6 @@ client_process_line(Client *client, char *line)
 			if (ret == COMMAND_RETURN_OK)
 				command_success(client);
 
-			client_write_output(client);
 			client->cmd_list.Reset();
 		} else {
 			if (!client->cmd_list.Add(line)) {
@@ -130,8 +128,6 @@ client_process_line(Client *client, char *line)
 
 			if (ret == COMMAND_RETURN_OK)
 				command_success(client);
-
-			client_write_output(client);
 		}
 	}
 

src/ClientRead.cxx

@@ -19,91 +19,48 @@
 
 #include "config.h"
 #include "ClientInternal.hxx"
-#include "util/fifo_buffer.h"
+#include "Main.hxx"
+#include "event/Loop.hxx"
 
 #include <assert.h>
 #include <string.h>
 
-static char *
-client_read_line(Client *client)
+BufferedSocket::InputResult
+Client::OnSocketInput(const void *data, size_t length)
 {
-	size_t length;
-	const char *p = (const char *)fifo_buffer_read(client->input, &length);
-	if (p == NULL)
-		return NULL;
+	g_timer_start(last_activity);
 
+	const char *p = (const char *)data;
 	const char *newline = (const char *)memchr(p, '\n', length);
 	if (newline == NULL)
-		return NULL;
+		return InputResult::MORE;
 
 	char *line = g_strndup(p, newline - p);
-	fifo_buffer_consume(client->input, newline - p + 1);
+	BufferedSocket::ConsumeInput(newline + 1 - p);
 
-	return g_strchomp(line);
-}
-
-static enum command_return
-client_input_received(Client *client, size_t bytesRead)
-{
-	char *line;
-
-	fifo_buffer_append(client->input, bytesRead);
-
-	/* process all lines */
-
-	while ((line = client_read_line(client)) != NULL) {
-		enum command_return ret = client_process_line(client, line);
-		g_free(line);
-
-		if (ret == COMMAND_RETURN_KILL ||
-		    ret == COMMAND_RETURN_CLOSE)
-			return ret;
-		if (client->IsExpired())
-			return COMMAND_RETURN_CLOSE;
-	}
-
-	return COMMAND_RETURN_OK;
-}
+	enum command_return result = client_process_line(this, line);
+	g_free(line);
 
-enum command_return
-client_read(Client *client)
-{
-	GError *error = NULL;
-	GIOStatus status;
-	gsize bytes_read;
+	switch (result) {
+	case COMMAND_RETURN_OK:
+	case COMMAND_RETURN_IDLE:
+	case COMMAND_RETURN_ERROR:
+		break;
 
-	assert(client != NULL);
-	assert(client->channel != NULL);
+	case COMMAND_RETURN_KILL:
+		Close();
+		main_loop->Break();
+		return InputResult::CLOSED;
 
-	size_t max_length;
-	char *p = (char *)fifo_buffer_write(client->input, &max_length);
-	if (p == NULL) {
-		g_warning("[%u] buffer overflow", client->num);
-		return COMMAND_RETURN_CLOSE;
+	case COMMAND_RETURN_CLOSE:
+		Close();
+		return InputResult::CLOSED;
 	}
 
-	status = g_io_channel_read_chars(client->channel, p, max_length,
-					 &bytes_read, &error);
-	switch (status) {
-	case G_IO_STATUS_NORMAL:
-		return client_input_received(client, bytes_read);
-
-	case G_IO_STATUS_AGAIN:
-		/* try again later, after select() */
-		return COMMAND_RETURN_OK;
-
-	case G_IO_STATUS_EOF:
-		/* peer disconnected */
-		return COMMAND_RETURN_CLOSE;
-
-	case G_IO_STATUS_ERROR:
-		/* I/O error */
-		g_warning("failed to read from client %d: %s",
-			  client->num, error->message);
-		g_error_free(error);
-		return COMMAND_RETURN_CLOSE;
+	if (IsExpired()) {
+		Close();
+		return InputResult::CLOSED;
 	}
 
-	/* unreachable */
-	return COMMAND_RETURN_CLOSE;
+	return InputResult::AGAIN;
 }

src/ClientWrite.cxx

@@ -20,98 +20,9 @@
 #include "config.h"
 #include "ClientInternal.hxx"
 
-#include <assert.h>
 #include <string.h>
 #include <stdio.h>
 
-static size_t
-client_write_direct(Client *client, const void *data, size_t length)
-{
-	assert(client != NULL);
-	assert(client->channel != NULL);
-	assert(data != NULL);
-	assert(length > 0);
-
-	gsize bytes_written;
-	GError *error = NULL;
-	GIOStatus status =
-		g_io_channel_write_chars(client->channel, (const gchar *)data,
-					 length, &bytes_written, &error);
-	switch (status) {
-	case G_IO_STATUS_NORMAL:
-		return bytes_written;
-
-	case G_IO_STATUS_AGAIN:
-		return 0;
-
-	case G_IO_STATUS_EOF:
-		/* client has disconnected */
-
-		client->SetExpired();
-		return 0;
-
-	case G_IO_STATUS_ERROR:
-		/* I/O error */
-
-		client->SetExpired();
-		g_warning("failed to write to %i: %s",
-			  client->num, error->message);
-		g_error_free(error);
-		return 0;
-	}
-
-	/* unreachable */
-	assert(false);
-	return 0;
-}
-
-void
-client_write_deferred(Client *client)
-{
-	assert(!client_is_expired(client));
-
-	while (true) {
-		size_t length;
-		const void *data = client->output_buffer.Read(&length);
-		if (data == nullptr)
-			break;
-
-		size_t nbytes = client_write_direct(client, data, length);
-		if (nbytes == 0)
-			return;
-
-		client->output_buffer.Consume(nbytes);
-
-		if (nbytes < length)
-			return;
-
-		g_timer_start(client->last_activity);
-	}
-}
-
-static void
-client_defer_output(Client *client, const void *data, size_t length)
-{
-	if (!client->output_buffer.Append(data, length)) {
-		g_warning("[%u] output buffer size is "
-			  "larger than the max (%lu)",
-			  client->num,
-			  (unsigned long)client_max_output_buffer_size);
-		/* cause client to close */
-		client->SetExpired();
-		return;
-	}
-}
-
-void
-client_write_output(Client *client)
-{
-	if (client->IsExpired())
-		return;
-
-	client_write_deferred(client);
-}
-
 /**
  * Write a block of data to the client.
  */
@@ -122,7 +33,7 @@ client_write(Client *client, const char *data, size_t length)
 	if (client->IsExpired() || length == 0)
 		return;
 
-	client_defer_output(client, data, length);
+	client->Write(data, length);
 }
 
 void

src/Listen.cxx

@@ -46,7 +46,7 @@ static void
 listen_callback(int fd, const struct sockaddr *address,
 		size_t address_length, int uid, G_GNUC_UNUSED void *ctx)
 {
-	client_new(*global_partition,
+	client_new(*main_loop, *global_partition,
 		   fd, address, address_length, uid);
 }