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Make root and relay selection somewhat more robust.

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This commit is contained in:
Adam Ierymenko 2015-11-02 16:03:28 -08:00
parent 00dcb0f22c
commit 4e9d430476
3 changed files with 44 additions and 26 deletions
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26
node/Peer.hpp
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@ -236,15 +236,33 @@ public:
inline uint64_t activelyTransferringFrames(uint64_t now) const throw() { return ((now - lastFrame()) < ZT_PEER_ACTIVITY_TIMEOUT); }
/**
* @return Current latency or 0 if unknown (max: 65535)
* @return Latency in milliseconds or 0 if unknown
*/
inline unsigned int latency() const
throw()
inline unsigned int latency() const { return _latency; }
/**
* This computes a quality score for relays and root servers
*
* If we haven't heard anything from these in ZT_PEER_ACTIVITY_TIMEOUT, they
* receive the worst possible quality (max unsigned int). Otherwise the
* quality is a product of latency and the number of potential missed
* pings. This causes roots and relays to switch over a bit faster if they
* fail.
*
* @return Relay quality score computed from latency and other factors, lower is better
*/
inline unsigned int relayQuality(const uint64_t now) const
{
const uint64_t tsr = now - _lastReceive;
if (tsr >= ZT_PEER_ACTIVITY_TIMEOUT)
return (~(unsigned int)0);
unsigned int l = _latency;
return std::min(l,(unsigned int)65535);
if (!l)
l = 0xffff;
return (l * (((unsigned int)tsr / (ZT_PEER_DIRECT_PING_DELAY + 1000)) + 1));
}
/**
* Update latency with a new direct measurment
*