From 49d21e9ada1fa140fb66137c7b3bc2453df7df6c Mon Sep 17 00:00:00 2001
From: subtly <subtly@users.noreply.github.com>
Date: Wed, 11 Feb 2015 01:43:36 -0500
Subject: [PATCH] add back fallback for retrying when connect peers is 0 and
 idealpeercount > 0

---
 libp2p/Host.cpp | 10 ++++++++++
 libp2p/Peer.cpp | 26 ++++++++++++++++++++++++++
 libp2p/Peer.h   | 10 ++++++++--
 3 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/libp2p/Host.cpp b/libp2p/Host.cpp
index 5ffb12c8f..e35f8100f 100644
--- a/libp2p/Host.cpp
+++ b/libp2p/Host.cpp
@@ -528,6 +528,16 @@ void Host::run(boost::system::error_code const&)
 	
 	keepAlivePeers();
 	disconnectLatePeers();
+
+	if (m_idealPeerCount && !peerCount())
+		for (auto p: m_peers)
+			if (p.second->shouldReconnect())
+			{
+				// TODO p2p: fixme
+				p.second->m_lastAttempted = std::chrono::system_clock::now();
+				connect(p.second);
+				break;
+			}
 	
 	auto runcb = [this](boost::system::error_code const& error) { run(error); };
 	m_timer->expires_from_now(boost::posix_time::milliseconds(c_timerInterval));
diff --git a/libp2p/Peer.cpp b/libp2p/Peer.cpp
index 1811da930..4be0fd799 100644
--- a/libp2p/Peer.cpp
+++ b/libp2p/Peer.cpp
@@ -31,6 +31,32 @@ namespace dev
 namespace p2p
 {
 
+bool Peer::shouldReconnect() const
+{
+	return chrono::system_clock::now() > m_lastAttempted + chrono::seconds(fallbackSeconds());
+}
+	
+unsigned Peer::fallbackSeconds() const
+{
+	switch (m_lastDisconnect)
+	{
+	case BadProtocol:
+		return 30 * (m_failedAttempts + 1);
+	case UselessPeer:
+	case TooManyPeers:
+	case ClientQuit:
+		return 15 * (m_failedAttempts + 1);
+	case NoDisconnect:
+	default:
+		if (m_failedAttempts < 5)
+			return m_failedAttempts ? m_failedAttempts * 5 : 5;
+		else if (m_failedAttempts < 15)
+			return 25 + (m_failedAttempts - 5) * 10;
+		else
+			return 25 + 100 + (m_failedAttempts - 15) * 20;
+	}
+}
+	
 bool Peer::operator<(Peer const& _p) const
 {
 	if (isOffline() != _p.isOffline())
diff --git a/libp2p/Peer.h b/libp2p/Peer.h
index 415573c0c..704e5c2b4 100644
--- a/libp2p/Peer.h
+++ b/libp2p/Peer.h
@@ -62,16 +62,22 @@ public:
 
 	virtual bool operator<(Peer const& _p) const;
 	
-	/// This peers rating.
+	/// WIP: Returns current peer rating.
 	int rating() const { return m_rating; }
 	
+	/// Return true if connection attempt should be made to this peer or false if
+	bool shouldReconnect() const;
+	
 	/// Number of times connection has been attempted to peer.
 	int failedAttempts() const { return m_failedAttempts; }
-	
+
 	/// Reason peer was previously disconnected.
 	DisconnectReason lastDisconnect() const { return m_lastDisconnect; }
 	
 protected:
+	/// Returns number of seconds to wait until attempting connection, based on attempted connection history.
+	unsigned fallbackSeconds() const;
+
 	int m_score = 0;									///< All time cumulative.
 	int m_rating = 0;									///< Trending.