From bdc70892c647f0d7672aba413100730819a4b217 Mon Sep 17 00:00:00 2001
From: Attila Molnar <attilamolnar@hush.com>
Date: Sun, 25 Jan 2015 13:41:24 +0100
Subject: m_spanningtree Rewrite PING logic to use Timers

---
 src/modules/m_spanningtree/pingtimer.cpp | 102 +++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/modules/m_spanningtree/pingtimer.cpp

(limited to 'src/modules/m_spanningtree/pingtimer.cpp')

diff --git a/src/modules/m_spanningtree/pingtimer.cpp b/src/modules/m_spanningtree/pingtimer.cpp
new file mode 100644
index 000000000..1c96259bf
--- /dev/null
+++ b/src/modules/m_spanningtree/pingtimer.cpp
@@ -0,0 +1,102 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2015 Attila Molnar <attilamolnar@hush.com>
+ *
+ * This file is part of InspIRCd.  InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * 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 General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "inspircd.h"
+
+#include "pingtimer.h"
+#include "treeserver.h"
+#include "commandbuilder.h"
+
+PingTimer::PingTimer(TreeServer* ts)
+	: Timer(Utils->PingFreq)
+	, server(ts)
+	, state(PS_SENDPING)
+{
+}
+
+PingTimer::State PingTimer::TickInternal()
+{
+	// Timer expired, take next action based on what happened last time
+	if (state == PS_SENDPING)
+	{
+		// Last ping was answered, send next ping
+		server->GetSocket()->WriteLine(CmdBuilder("PING").push(server->GetID()));
+		LastPingMsec = ServerInstance->Time() * 1000 + (ServerInstance->Time_ns() / 1000000);
+		// Warn next unless warnings are disabled. If they are, jump straight to timeout.
+		if (Utils->PingWarnTime)
+			return PS_WARN;
+		else
+			return PS_TIMEOUT;
+	}
+	else if (state == PS_WARN)
+	{
+		// No pong arrived in PingWarnTime seconds, send a warning to opers
+		ServerInstance->SNO->WriteToSnoMask('l', "Server \002%s\002 has not responded to PING for %d seconds, high latency.", server->GetName().c_str(), GetInterval());
+		return PS_TIMEOUT;
+	}
+	else // PS_TIMEOUT
+	{
+		// They didn't answer the last ping, if they are locally connected, get rid of them
+		if (server->IsLocal())
+		{
+			TreeSocket* sock = server->GetSocket();
+			sock->SendError("Ping timeout");
+			sock->Close();
+		}
+
+		// If the server is non-locally connected, don't do anything until we get a PONG.
+		// This is to avoid pinging the server and warning opers more than once.
+		// If they do answer eventually, we will move to the PS_SENDPING state and ping them again.
+		return PS_IDLE;
+	}
+}
+
+void PingTimer::SetState(State newstate)
+{
+	state = newstate;
+
+	// Set when should the next Tick() happen based on the state
+	if (state == PS_SENDPING)
+		SetInterval(Utils->PingFreq);
+	else if (state == PS_WARN)
+		SetInterval(Utils->PingWarnTime);
+	else if (state == PS_TIMEOUT)
+		SetInterval(Utils->PingFreq - Utils->PingWarnTime);
+
+	// If state == PS_IDLE, do not set the timer, see above why
+}
+
+bool PingTimer::Tick(time_t currtime)
+{
+	if (server->IsDead())
+		return false;
+
+	SetState(TickInternal());
+	return false;
+}
+
+void PingTimer::OnPong()
+{
+	// Calculate RTT
+	long ts = ServerInstance->Time() * 1000 + (ServerInstance->Time_ns() / 1000000);
+	server->rtt = ts - LastPingMsec;
+
+	// Change state to send ping next, also reschedules the timer appropriately
+	SetState(PS_SENDPING);
+}
-- 
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