Configurable socket queue size

nano/core_test/socket.cpp

@@ -171,10 +171,10 @@ TEST (socket, drop_policy)
 
 	// We're going to write twice the queue size + 1, and the server isn't reading
 	// The total number of drops should thus be 1 (the socket allows doubling the queue size for no_socket_drop)
-	func (nano::transport::tcp_socket::queue_size * 2 + 1);
+	func (nano::transport::tcp_socket::default_queue_size * 2 + 1);
 	ASSERT_EQ (1, failed_writes);
 
-	func (nano::transport::tcp_socket::queue_size + 1);
+	func (nano::transport::tcp_socket::default_queue_size + 1);
 	ASSERT_EQ (0, failed_writes);
 }
 
@@ -398,7 +398,7 @@ TEST (socket_timeout, write)
 	// create a client socket and send lots of data to fill the socket queue on the local and remote side
 	// eventually, the all tcp queues should fill up and async_write will not be able to progress
 	// and the timeout should kick in and close the socket, which will cause the async_write to return an error
-	auto socket = std::make_shared<nano::transport::tcp_socket> (*node, nano::transport::socket_endpoint::client); // socket with a max queue size much larger than OS buffers
+	auto socket = std::make_shared<nano::transport::tcp_socket> (*node, nano::transport::socket_endpoint::client, 1024 * 1024); // socket with a max queue size much larger than OS buffers
 
 	socket->async_connect (acceptor.local_endpoint (), [&socket, &done] (boost::system::error_code const & ec_a) {
 		EXPECT_FALSE (ec_a);
@@ -513,7 +513,7 @@ TEST (socket_timeout, write_overlapped)
 	// create a client socket and send lots of data to fill the socket queue on the local and remote side
 	// eventually, the all tcp queues should fill up and async_write will not be able to progress
 	// and the timeout should kick in and close the socket, which will cause the async_write to return an error
-	auto socket = std::make_shared<nano::transport::tcp_socket> (*node, nano::transport::socket_endpoint::client); // socket with a max queue size much larger than OS buffers
+	auto socket = std::make_shared<nano::transport::tcp_socket> (*node, nano::transport::socket_endpoint::client, 1024 * 1024); // socket with a max queue size much larger than OS buffers
 	socket->async_connect (acceptor.local_endpoint (), [&socket, &done] (boost::system::error_code const & ec_a) {
 		EXPECT_FALSE (ec_a);
 

nano/node/transport/tcp_socket.cpp

@@ -16,12 +16,13 @@
  * socket
  */
 
-nano::transport::tcp_socket::tcp_socket (nano::node & node_a, nano::transport::socket_endpoint endpoint_type_a) :
+nano::transport::tcp_socket::tcp_socket (nano::node & node_a, nano::transport::socket_endpoint endpoint_type_a, size_t queue_size_a) :
-	tcp_socket{ node_a, boost::asio::ip::tcp::socket{ node_a.io_ctx }, {}, {}, endpoint_type_a }
+	tcp_socket{ node_a, boost::asio::ip::tcp::socket{ node_a.io_ctx }, {}, {}, endpoint_type_a, queue_size_a }
 {
 }
 
-nano::transport::tcp_socket::tcp_socket (nano::node & node_a, boost::asio::ip::tcp::socket raw_socket_a, boost::asio::ip::tcp::endpoint remote_endpoint_a, boost::asio::ip::tcp::endpoint local_endpoint_a, nano::transport::socket_endpoint endpoint_type_a) :
+nano::transport::tcp_socket::tcp_socket (nano::node & node_a, boost::asio::ip::tcp::socket raw_socket_a, boost::asio::ip::tcp::endpoint remote_endpoint_a, boost::asio::ip::tcp::endpoint local_endpoint_a, nano::transport::socket_endpoint endpoint_type_a, size_t queue_size_a) :
+	queue_size{ queue_size_a },
 	send_queue{ queue_size },
 	node_w{ node_a.shared () },
 	strand{ node_a.io_ctx.get_executor () },

nano/node/transport/tcp_socket.hpp

@@ -67,10 +67,10 @@ class tcp_socket final : public std::enable_shared_from_this<tcp_socket>
 	friend class tcp_listener;
 
 public:
-	static size_t constexpr queue_size = 16;
+	static size_t constexpr default_queue_size = 16;
 
 public:
-	explicit tcp_socket (nano::node &, nano::transport::socket_endpoint = socket_endpoint::client);
+	explicit tcp_socket (nano::node &, nano::transport::socket_endpoint = socket_endpoint::client, size_t queue_size = default_queue_size);
 
 	// TODO: Accepting remote/local endpoints as a parameter is unnecessary, but is needed for now to keep compatibility with the legacy code
 	tcp_socket (
@@ -78,7 +78,8 @@ public:
 	boost::asio::ip::tcp::socket,
 	boost::asio::ip::tcp::endpoint remote_endpoint,
 	boost::asio::ip::tcp::endpoint local_endpoint,
-	nano::transport::socket_endpoint = socket_endpoint::server);
+	nano::transport::socket_endpoint = socket_endpoint::server,
+	size_t queue_size = default_queue_size);
 
 	~tcp_socket ();
 
@@ -141,6 +142,7 @@ public:
 	}
 
 private:
+	size_t const queue_size;
 	socket_queue send_queue;
 
 protected: