reduce code needed in evt-tls examples

** after further research of `openssl` and the `libuv` integration implementations from https://github.com/deleisha/evt-tls and another from https://github.com/openziti/tlsuv

both will need major rewriting based on how callbacks are structured, and most likely eventually dropped altogether, only now used for working reference for something custom.

multiple issues showing up with `tcp-echo-server.c` example, not consistently working. **

Author: TheTechsTech

examples/tcp-echo-server.c

@@ -5,6 +5,7 @@
 
 void new_connection(uv_stream_t *socket) {
 	string data = stream_read(socket);
+	printf(CLR_LN"%s\n", data);
 	if (data)
 		stream_write(socket, data);
 }
@@ -16,8 +17,8 @@ int uv_main(int argc, char **argv) {
 	string_t host = is_secure ? "tls://127.0.0.1:%d" : "0.0.0.0:%d";
 
 	if (snprintf(addr, sizeof(addr), host, DEFAULT_PORT)) {
-		if (is_secure)
-			use_certificate(nullptr, 0);
+		//if (is_secure)
+		//	use_certificate(nullptr, 0);
 
 		server = stream_bind(addr, 0);
         while (server) {

examples/uv_tls_client.c

@@ -69,21 +69,17 @@ int uv_main(int argc, char **argv) {
 	yield();
 	uv_loop_t *loop = asio_loop();
     //free on uv_close_cb via uv_tls_close call
-    uv_tcp_t *client = malloc(sizeof *client);
-    uv_tcp_init(loop, client);
+	uv_tcp_t *client = tcp_create();
     int port = 7000;
 
     evt_ctx_t ctx;
 
 	evt_ctx_init_ex(&ctx, cert_file(), pkey_file());
     evt_ctx_set_nio(&ctx, NULL, uv_tls_writer);
 
-    struct sockaddr_in conn_addr;
-    uv_ip4_addr("127.0.0.1", port, &conn_addr);
-
     uv_connect_t req;
     req.data = &ctx;
-    uv_tcp_connect(&req, client,(const struct sockaddr*)&conn_addr, on_connect);
+	uv_tcp_connect(&req, client, sockaddr("127.0.0.1", port), on_connect);
 
     uv_run(loop, UV_RUN_DEFAULT);
 	evt_ctx_free(&ctx);

examples/uv_tls_server.c

@@ -50,19 +50,16 @@ int uv_main(int argc, char **argv) {
     uv_loop_t *loop = asio_loop();
 	int port = 7000, r = 0;
     evt_ctx_t ctx;
-    struct sockaddr_in bind_local;
 
     evt_ctx_init_ex(&ctx, cert_file(), pkey_file());
     evt_ctx_set_nio(&ctx, NULL, uv_tls_writer);
 
-    uv_tcp_t listener_local;
-    uv_tcp_init(loop, &listener_local);
-    listener_local.data = &ctx;
-    uv_ip4_addr("127.0.0.1", port, &bind_local);
-    if ((r = uv_tcp_bind(&listener_local, (struct sockaddr*)&bind_local, 0)))
+	uv_tcp_t *listener_local = tcp_create();
+    listener_local->data = &ctx;
+	if ((r = uv_tcp_bind(listener_local, sockaddr("127.0.0.1", port), 0)))
         fprintf( stderr, "bind: %s\n", uv_strerror(r));
 
-    if ((r = uv_listen((uv_stream_t*)&listener_local, 1024, on_connect_cb)))
+    if ((r = uv_listen((uv_stream_t*)listener_local, 1024, on_connect_cb)))
         fprintf( stderr, "listen: %s\n", uv_strerror(r));
     printf("Listening on %d\n", port);
     uv_run(loop, UV_RUN_DEFAULT);

include/asio.h

@@ -527,6 +527,7 @@ C_API u32 delay(u32 ms);
 C_API void tls_generator_set(uv_tls_t *);
 C_API void tls_yielding(uv_tls_t *, ssize_t nread, bool is_err);
 C_API uv_tls_t *tls_handle(uv_stream_t *);
+C_API sockaddr_t *sockaddr(string_t host, int port);
 
 #ifdef _WIN32
 #define _BIO_MODE_R(flags) (((flags) & PKCS7_BINARY) ? "rb" : "r")

src/asio.c

@@ -1480,7 +1480,7 @@ int stream_write(uv_stream_t *handle, string_t text) {
         return RAII_ERR;
 
     uv_args_t *uv_args = (uv_args_t *)uv_handle_get_data(handler(handle));
-	if (is_defined(uv_args) || is_tls(handle)) {
+	if (is_defined(uv_args)) {
 		if ((!uv_is_writable(handle) || uv_is_closing(handler(handle))))
 			return UV_EBADF;
 
@@ -1669,12 +1669,17 @@ static string stream_get(uv_stream_t *handle) {
     return yield_for(gen).char_ptr;
 }
 
+sockaddr_t *sockaddr(string_t host, int port) {
+	uv_args_t *uv_args = uv_arguments(0, true);
+	return (sockaddr_t *)asio_sockaddr(host, port, uv_args->dns->in6, uv_args->dns->in4);
+}
+
 int stream_shutdown(uv_stream_t *handle) {
     if (is_empty(handle))
         return coro_err_code();
 
     uv_args_t *uv_args = (uv_args_t *)uv_handle_get_data(handler(handle));
-    if (is_defined(uv_args) || is_tls(handle)) {
+    if (is_defined(uv_args)) {
         uv_args->args[0].object = handle;
     } else {
         uv_args = uv_arguments(1, true);
@@ -2666,10 +2671,10 @@ RAII_INLINE bool is_tcp(void_t self) {
 
 RAII_INLINE bool is_tls(uv_stream_t *self) {
     if (!self)
-        return false;
+		return false;
 
-    void_t check = uv_handle_get_data(handler(self));
-    return is_defined(check) && ((uv_args_t *)check)->bind_type == UV_TLS;
+	uv_args_t *uv_args = (uv_args_t *)uv_handle_get_data(handler(self));
+	return is_defined(uv_args) && uv_args->bind_type == UV_TLS;
 }
 
 RAII_INLINE bool is_udp(void_t self) {