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06488c1318
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
#pragma once
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#include <algorithm>
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#include <array>
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#include <chrono>
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#include <cstdint>
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/**
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* Heuristically tuned constants.
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*/
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/** @{ */
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namespace xrpl::peer_finder::tuning {
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//---------------------------------------------------------
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//
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// Automatic Connection Policy
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//
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//---------------------------------------------------------
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/**
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* Time to wait between making batches of connection attempts
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*/
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static constexpr auto kSecondsPerConnect = 10;
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/**
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* Maximum number of simultaneous connection attempts.
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*/
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static constexpr auto kMaxConnectAttempts = 20;
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/**
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* The percentage of total peer slots that are outbound.
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* The number of outbound peers will be the larger of the
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* minOutCount and outPercent * Config::maxPeers specially
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* rounded.
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*/
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static constexpr auto kOutPercent = 15;
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/**
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* A hard minimum on the number of outgoing connections.
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* This is enforced outside the Logic, so that the unit test
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* can use any settings it wants.
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*/
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static constexpr auto kMinOutCount = 10;
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/**
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* The default value of Config::maxPeers.
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*/
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static constexpr auto kDefaultMaxPeers = 21;
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/**
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* Max redirects we will accept from one connection.
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* Redirects are limited for security purposes, to prevent
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* the address caches from getting flooded.
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*/
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static constexpr auto kMaxRedirects = 30;
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//------------------------------------------------------------------------------
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//
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// Fixed
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//
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//------------------------------------------------------------------------------
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static std::array<int, 10> const kConnectionBackoff{{1, 1, 2, 3, 5, 8, 13, 21, 34, 55}};
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//------------------------------------------------------------------------------
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//
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// Bootcache
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//
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//------------------------------------------------------------------------------
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// Threshold of cache entries above which we trim.
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static constexpr auto kBootcacheSize = 1000;
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// The percentage of addresses we prune when we trim the cache.
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static constexpr auto kBootcachePrunePercent = 10;
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// The cool down wait between database updates
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// Ideally this should be larger than the time it takes a full
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// peer to send us a set of addresses and then disconnect.
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//
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static std::chrono::seconds const kBootcacheCooldownTime(60);
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//------------------------------------------------------------------------------
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//
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// Livecache
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//
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//------------------------------------------------------------------------------
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// Drop incoming messages with hops greater than this number
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constexpr std::uint32_t kMaxHops = 6;
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// How many Endpoint to send in each mtENDPOINTS
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constexpr std::uint32_t kNumberOfEndpoints = 2 * kMaxHops;
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// The most Endpoint we will accept in mtENDPOINTS
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constexpr std::uint32_t kNumberOfEndpointsMax =
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std::max<decltype(kNumberOfEndpoints)>(kNumberOfEndpoints * 2, 64);
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// Number of addresses we provide when redirecting.
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constexpr std::uint32_t kRedirectEndpointCount = 10;
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// How often we send or accept mtENDPOINTS messages per peer
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// (we use a prime number of purpose)
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constexpr std::chrono::seconds kSecondsPerMessage(151);
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// How long an Endpoint will stay in the cache
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// This should be a small multiple of the broadcast frequency
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constexpr std::chrono::seconds kLiveCacheSecondsToLive(30);
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// How much time to wait before trying an outgoing address again.
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// Note that we ignore the port for purposes of comparison.
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constexpr std::chrono::seconds kRecentAttemptDuration(60);
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} // namespace xrpl::peer_finder::tuning
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/** @} */
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