Changed channel to a class.

I believe this interface is better to work with. Later I'll add the
"send message" interfaces to the channel class.

src/channel.cpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2018 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "neocomm/channel.hpp"
+
+using namespace neocomm;
+
+channel::channel(const std::string &name,
+		dht::DhtRunner *network) :
+		name(name), key(dht::InfoHash::get(name)),
+		network(network) {
+	token = network->listen<struct message>(key,
+			[&](struct message &&msg) {
+				messages.push_back(msg);
+				return true;
+			});
+}
+
+channel::~channel() {
+	network->cancelListen(key, token.get());
+}

src/node.cpp

@@ -31,22 +31,33 @@ node::~node() {
 	network.join();
 }
 
-void node::join_channel(const std::string &name) {
+channel *node::join_channel(const std::string &name) {
+	// don't do anything if already joined
 	if(get_channel(name))
-		return;
-	channels[name].key = dht::InfoHash::get(name);
-	channels[name].token = network.listen<struct message>(
-			channels[name].key,
-			[&](struct message &&msg) {
-				channels[name].messages.push_back(msg);
-				return true;
-			});
+		return nullptr;
+
+	channels.push_back(new channel(name, &network));
+	return channels.back();
+}
+
+channel *node::get_channel(const std::string &name) {
+	for(auto i : channels)
+	{
+		if(i->get_name() == name)
+			return i;
+	}
+	return nullptr;
 }
 
 void node::leave_channel(const std::string &name) {
-	if(not get_channel(name))
-		return;
-	network.cancelListen(channels[name].key,
-			channels[name].token.get());
-	channels.erase(name);
+	for(auto i = channels.begin();
+			i not_eq channels.end(); ++i)
+	{
+		if((*i)->get_name() == name)
+		{
+			delete *i;
+			channels.erase(i);
+			return;
+		}
+	}
 }