ease asserting, constants wrapped for future robustness

source/eventcore/driver.d

@@ -216,7 +216,7 @@ interface EventDriverSockets {
 	void setKeepAlive(StreamSocketFD socket, bool enable);
 
 	/** Enables keepalive for the TCP socket and sets additional parameters.
-		Silently ignores unsupported systems.
+		Silently ignores unsupported systems (anything but Windows and Linux).
 
 		Params:
 			socket = Socket file descriptor to set options on.

source/eventcore/drivers/posix/sockets.d

@@ -51,10 +51,15 @@ version (linux) {
 	// Linux-specific TCP options
 	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/tcp.h#L95
 	// Some day we should siply import core.sys.linux.netinet.tcp;
+	static if (!is(typeof(SOL_TCP)))
 		enum SOL_TCP = 6;
+	static if (!is(typeof(TCP_KEEPIDLE)))
 		enum TCP_KEEPIDLE = 4;
+	static if (!is(typeof(TCP_KEEPINTVL)))
 		enum TCP_KEEPINTVL = 5;
+	static if (!is(typeof(TCP_KEEPCNT)))
 		enum TCP_KEEPCNT = 6;
+	static if (!is(typeof(TCP_USER_TIMEOUT)))
 		enum TCP_USER_TIMEOUT = 18;
 }
 version(OSX) {
@@ -310,36 +315,29 @@ final class PosixEventDriverSockets(Loop : PosixEventLoop) : EventDriverSockets
 		int opt = enable;
 		int err = setsockopt(cast(sock_t)socket, SOL_SOCKET, SO_KEEPALIVE, &opt, int.sizeof);
 		if (err != 0)
-		{
+			print("sock error in setKeepAlive: %s", getSocketError);
-			print("sock error %s", getSocketError);
-			assert(0, "unable to set SO_KEEPALIVE option");
-		}
 	}
 
 	override void setKeepAliveParams(StreamSocketFD socket, Duration idle, Duration interval, int probeCount) @trusted
 	{
+		// dunnno about BSD\OSX, maybe someone should fix it for them later
 		version (linux) {
 			setKeepAlive(socket, true);
 			int int_opt = cast(int) idle.total!"seconds"();
 			int err = setsockopt(cast(sock_t)socket, SOL_TCP, TCP_KEEPIDLE, &int_opt, int.sizeof);
-			if (err != 0)
+			if (err != 0) {
-			{
+				print("sock error on setsockopt TCP_KEEPIDLE: %s", getSocketError);
-				print("sock error %s", getSocketError);
+				return;
-				assert(0, "unable to set TCP_KEEPIDLE option");
 			}
 			int_opt = cast(int) interval.total!"seconds"();
 			err = setsockopt(cast(sock_t)socket, SOL_TCP, TCP_KEEPINTVL, &int_opt, int.sizeof);
-			if (err != 0)
+			if (err != 0) {
-			{
+				print("sock error on setsockopt TCP_KEEPINTVL: %s", getSocketError);
-				print("sock error %s", getSocketError);
+				return;
-				assert(0, "unable to set TCP_KEEPINTVL option");
 			}
 			err = setsockopt(cast(sock_t)socket, SOL_TCP, TCP_KEEPCNT, &probeCount, int.sizeof);
 			if (err != 0)
-			{
+				print("sock error on setsockopt TCP_KEEPCNT: %s", getSocketError);
-				print("sock error %s", getSocketError);
-				assert(0, "unable to set TCP_KEEPCNT option");
-			}
 		}
 	}
 
@@ -349,10 +347,7 @@ final class PosixEventDriverSockets(Loop : PosixEventLoop) : EventDriverSockets
 			uint tmsecs = cast(uint) timeout.total!"msecs";
 			int err = setsockopt(cast(sock_t)socket, SOL_TCP, TCP_USER_TIMEOUT, &tmsecs, uint.sizeof);
 			if (err != 0)
-			{
+				print("sock error on setsockopt TCP_USER_TIMEOUT %s", getSocketError);
-				print("sock error %s", getSocketError);
-				assert(0, "unable to set TCP_USER_TIMEOUT option");
-			}
 		}
 	}
 

source/eventcore/drivers/winapi/sockets.d

@@ -225,15 +225,12 @@ final class WinAPIEventDriverSockets : EventDriverSockets {
 
 	override void setKeepAliveParams(StreamSocketFD socket, Duration idle, Duration interval, int probeCount) @trusted
 	{
-		tcp_keepalive opts = tcp_keepalive(1, cast(ulong) idle.total!"msecs"(),
+		tcp_keepalive opts = tcp_keepalive(1, cast(c_ulong) idle.total!"msecs"(),
-			cast(ulong) interval.total!"msecs");
+			cast(c_ulong) interval.total!"msecs");
-		int result = WSAIoctl(socket, SIO_KEEPALIVE_VALS, &opts, cast(uint) tcp_keepalive.sizeof,
+		int result = WSAIoctl(socket, SIO_KEEPALIVE_VALS, &opts, cast(DWORD) tcp_keepalive.sizeof,
 			null, 0, null, null, null);
 		if (result != 0)
-		{
+			print("WSAIoctl error on SIO_KEEPALIVE_VALS: %d", WSAGetLastError());
-			print("WSAIoctl SIO_KEEPALIVE_VALS returned %d", result);
-			assert(0, "unable to set TCP keepAlive parameters");
-		}
 	}
 
 	override void setUserTimeout(StreamSocketFD socket, Duration timeout) {}

source/eventcore/internal/win32.d

@@ -4,6 +4,7 @@ version(Windows):
 
 public import core.sys.windows.windows;
 public import core.sys.windows.winsock2;
+public import core.stdc.config: c_ulong;
 
 extern(System) nothrow:
 
@@ -106,9 +107,9 @@ struct ADDRINFOW {
 
 // https://msdn.microsoft.com/en-us/library/windows/desktop/dd877220(v=vs.85).aspx
 struct tcp_keepalive {
-	ulong onoff;
+	c_ulong onoff;
-	ulong keepalivetime;
+	c_ulong keepalivetime;
-	ulong keepaliveinterval;
+	c_ulong keepaliveinterval;
 };
 
 // https://gist.github.com/piscisaureus/906386#file-winsock2-h-L1099

source/eventcore/socket.d

@@ -2,6 +2,7 @@ module eventcore.socket;
 
 import eventcore.core : eventDriver;
 import eventcore.driver;
+import core.time: Duration;
 import std.exception : enforce;
 import std.socket : Address;
 
@@ -49,6 +50,11 @@ struct StreamSocket {
 
 	@property ConnectionState state() { return eventDriver.sockets.getConnectionState(m_fd); }
 	@property void tcpNoDelay(bool enable) { eventDriver.sockets.setTCPNoDelay(m_fd, enable); }
+	void setKeepAlive(bool enable) { eventDriver.sockets.setKeepAlive(m_fd, enable); }
+	void setKeepAliveParams(Duration idle, Duration interval, int probeCount = 5) {
+		eventDriver.sockets.setKeepAliveParams(m_fd, idle, interval, probeCount);
+	}
+	void setUserTimeout(Duration timeout) { eventDriver.sockets.setUserTimeout(m_fd, timeout); }
 }
 
 void read(alias callback)(ref StreamSocket socket, ubyte[] buffer, IOMode mode)

tests/0-tcp.d

@@ -8,7 +8,7 @@ import eventcore.core;
 import eventcore.socket;
 import eventcore.internal.utils : print;
 import std.socket : InternetAddress;
-import core.time : Duration, msecs;
+import core.time : Duration, msecs, seconds;
 
 ubyte[256] s_rbuf;
 bool s_done;
@@ -69,6 +69,10 @@ void main()
 		client = sock;
 		assert(status == ConnectStatus.connected);
 		assert(sock.state == ConnectionState.connected);
+		print("Setting keepalive and timeout options");
+		client.setKeepAlive(true);
+		client.setKeepAliveParams(10.seconds, 10.seconds, 4);
+		client.setUserTimeout(5.seconds);
 		print("Initial write");
 		client.write!((wstatus, bytes) {
 			print("Initial write done");