Add a Transport:messages/0 function to obtain the atoms sent in active mode.

That way we can support active mode without having to hardcode the atoms
for each transports available.

src/cowboy_ssl_transport.erl

@@ -13,7 +13,7 @@
 %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 -module(cowboy_ssl_transport).
--export([name/0, listen/1, accept/1, recv/3, send/2, setopts/2,
+-export([name/0, messages/0, listen/1, accept/1, recv/3, send/2, setopts/2,
 	controlling_process/2, peername/1, close/1]). %% API.
 
 -include("include/types.hrl").
@@ -23,6 +23,9 @@
 -spec name() -> ssl.
 name() -> ssl.
 
+-spec messages() -> {ssl, ssl_closed, ssl_error}.
+messages() -> {ssl, ssl_closed, ssl_error}.
+
 -spec listen([{port, Port::port_number()} | {certfile, CertPath::string()}
 	| {keyfile, KeyPath::string()} | {password, Password::string()}])
 	-> {ok, LSocket::socket()} | {error, Reason::posix()}.

src/cowboy_tcp_transport.erl

@@ -13,14 +13,19 @@
 %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 -module(cowboy_tcp_transport).
--export([name/0, listen/1, accept/1, recv/3, send/2, setopts/2,
-	controlling_process/2, peername/1, close/1]).
+-export([name/0, messages/0, listen/1, accept/1, recv/3, send/2, setopts/2,
+	controlling_process/2, peername/1, close/1]). %% API.
 
 -include("include/types.hrl").
 
+%% API.
+
 -spec name() -> tcp.
 name() -> tcp.
 
+-spec messages() -> {tcp, tcp_closed, tcp_error}.
+messages() -> {tcp, tcp_closed, tcp_error}.
+
 -spec listen([{port, Port::port_number()}])
 	-> {ok, LSocket::socket()} | {error, Reason::posix()}.
 listen(Opts) ->