Add a draft version of a managed socket wrapper API.

tests/0-udp.d

@@ -0,0 +1,77 @@
+/++ dub.sdl:
+	name "test"
+	dependency "eventcore" path=".."
++/
+module test;
+
+import eventcore.core;
+import eventcore.socket;
+import std.socket : InternetAddress;
+
+DatagramSocket s_baseSocket;
+DatagramSocket s_freeSocket;
+DatagramSocket s_connectedSocket;
+ubyte[256] s_rbuf;
+bool s_done;
+
+void main()
+{
+	static ubyte[] pack1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+	static ubyte[] pack2 = [4, 3, 2, 1, 0];
+
+	auto baddr = new InternetAddress(0x7F000001, 40001);
+	auto anyaddr = new InternetAddress(0x7F000001, 0);
+	s_baseSocket = createDatagramSocket(baddr);
+	s_freeSocket = createDatagramSocket(anyaddr);
+	s_connectedSocket = createDatagramSocket(anyaddr, baddr);
+	s_baseSocket.receive!((status, bytes, addr) {
+		log("receive initial: %s %s", status, bytes);
+		assert(status == IOStatus.wouldBlock);
+	})(s_rbuf, IOMode.immediate);
+	s_baseSocket.receive!((status, bts, address) {
+		log("receive1: %s %s", status, bts);
+		assert(status == IOStatus.ok);
+		assert(bts == pack1.length);
+		assert(s_rbuf[0 .. pack1.length] == pack1);
+
+		s_freeSocket.send!((status, bytes) {
+			log("send2: %s %s", status, bytes);
+			assert(status == IOStatus.ok);
+			assert(bytes == pack2.length);
+		})(pack2, IOMode.once, baddr);
+
+		s_baseSocket.receive!((status, bts, scope addr) {
+			log("receive2: %s %s", status, bts);
+			assert(status == IOStatus.ok);
+			assert(bts == pack2.length);
+			assert(s_rbuf[0 .. pack2.length] == pack2);
+
+			destroy(s_baseSocket);
+			destroy(s_freeSocket);
+			destroy(s_connectedSocket);
+			s_done = true;
+			log("done.");
+
+			// FIXME: this shouldn't ne necessary:
+			eventDriver.core.exit();
+		})(s_rbuf, IOMode.immediate);
+	})(s_rbuf, IOMode.once);
+	s_connectedSocket.send!((status, bytes) {
+		log("send1: %s %s", status, bytes);
+		assert(status == IOStatus.ok);
+		assert(bytes == 10);
+	})(pack1, IOMode.immediate);
+
+	ExitReason er;
+	do er = eventDriver.core.processEvents();
+	while (er == ExitReason.idle);
+	//assert(er == ExitReason.outOfWaiters); // FIXME: see above
+	assert(s_done);
+}
+
+void log(ARGS...)(string fmt, ARGS args)
+@trusted {
+	import std.stdio;
+	try writefln(fmt, args);
+	catch (Exception e) assert(false, e.msg);
+}