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#include <peerstats/peer_db.hpp>
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#include <util/logging/logger.hpp>
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#include <util/status.hpp>
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#include <util/str.hpp>
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namespace llarp
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{
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PeerDb::PeerDb()
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{
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m_lastFlush.store({});
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}
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void
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PeerDb::loadDatabase(std::optional<std::filesystem::path> file)
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{
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std::lock_guard gaurd(m_statsLock);
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m_peerStats.clear();
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if (m_storage)
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throw std::runtime_error("Reloading database not supported"); // TODO
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// sqlite_orm treats empty-string as an indicator to load a memory-backed database, which we'll
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// use if file is an empty-optional
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std::string fileString;
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if (file.has_value())
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{
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fileString = file.value().native();
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LogInfo("Loading PeerDb from file ", fileString);
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}
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else
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{
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LogInfo("Loading memory-backed PeerDb");
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}
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m_storage = std::make_unique<PeerDbStorage>(initStorage(fileString));
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m_storage->sync_schema(true); // true for "preserve" as in "don't nuke" (how cute!)
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auto allStats = m_storage->get_all<PeerStats>();
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LogInfo("Loading ", allStats.size(), " PeerStats from table peerstats...");
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for (const PeerStats& stats : allStats)
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{
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RouterID id;
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if (not id.FromString(stats.routerId))
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throw std::runtime_error(
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stringify("Database contains invalid PeerStats with id ", stats.routerId));
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m_peerStats[id] = stats;
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}
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}
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void
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PeerDb::flushDatabase()
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{
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LogDebug("flushing PeerDb...");
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auto start = time_now_ms();
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if (not shouldFlush(start))
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LogWarn("Double PeerDb flush?");
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if (not m_storage)
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throw std::runtime_error("Cannot flush database before it has been loaded");
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decltype(m_peerStats) copy;
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{
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std::lock_guard gaurd(m_statsLock);
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copy = m_peerStats; // expensive deep copy
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}
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for (const auto& entry : copy)
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{
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// call me paranoid...
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assert(not entry.second.routerId.empty());
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assert(entry.first.ToString() == entry.second.routerId);
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m_storage->replace(entry.second);
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}
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auto end = time_now_ms();
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auto elapsed = end - start;
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LogInfo("PeerDb flush took about ", elapsed, " millis");
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m_lastFlush.store(end);
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}
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void
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PeerDb::accumulatePeerStats(const RouterID& routerId, const PeerStats& delta)
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{
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if (routerId.ToString() != delta.routerId)
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throw std::invalid_argument(
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stringify("routerId ", routerId, " doesn't match ", delta.routerId));
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std::lock_guard gaurd(m_statsLock);
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auto itr = m_peerStats.find(routerId);
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if (itr == m_peerStats.end())
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itr = m_peerStats.insert({routerId, delta}).first;
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else
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itr->second += delta;
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}
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void
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PeerDb::modifyPeerStats(const RouterID& routerId, std::function<void(PeerStats&)> callback)
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{
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std::lock_guard gaurd(m_statsLock);
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PeerStats& stats = m_peerStats[routerId];
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stats.routerId = routerId.ToString();
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callback(stats);
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}
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std::optional<PeerStats>
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PeerDb::getCurrentPeerStats(const RouterID& routerId) const
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{
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std::lock_guard gaurd(m_statsLock);
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auto itr = m_peerStats.find(routerId);
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if (itr == m_peerStats.end())
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return std::nullopt;
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else
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return itr->second;
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}
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void
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PeerDb::handleGossipedRC(const RouterContact& rc, llarp_time_t now)
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{
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std::lock_guard gaurd(m_statsLock);
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RouterID id(rc.pubkey);
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auto& stats = m_peerStats[id];
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stats.routerId = id.ToString();
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if (stats.lastRCUpdated < rc.last_updated.count())
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{
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if (stats.numDistinctRCsReceived > 0)
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{
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// we track max expiry as the delta between (time received - last expiration time),
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// and this value will often be negative for a healthy router
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// TODO: handle case where new RC is also expired? just ignore?
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int64_t expiry = (now.count() - (stats.lastRCUpdated + RouterContact::Lifetime.count()));
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stats.mostExpiredRCMs = std::max(stats.mostExpiredRCMs, expiry);
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if (stats.numDistinctRCsReceived == 1)
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stats.mostExpiredRCMs = expiry;
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else
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stats.mostExpiredRCMs = std::max(stats.mostExpiredRCMs, expiry);
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}
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stats.numDistinctRCsReceived++;
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stats.lastRCUpdated = rc.last_updated.count();
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}
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}
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void
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PeerDb::configure(const RouterConfig& routerConfig)
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{
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if (not routerConfig.m_enablePeerStats)
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throw std::runtime_error("[router]:enable-peer-stats is not enabled");
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fs::path dbPath = routerConfig.m_dataDir / "peerstats.sqlite";
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loadDatabase(dbPath);
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}
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bool
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PeerDb::shouldFlush(llarp_time_t now)
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{
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constexpr llarp_time_t TargetFlushInterval = 30s;
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return (now - m_lastFlush.load() >= TargetFlushInterval);
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}
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util::StatusObject
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PeerDb::ExtractStatus() const
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{
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std::lock_guard gaurd(m_statsLock);
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bool loaded = (m_storage.get() != nullptr);
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util::StatusObject dbFile = nullptr;
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if (loaded)
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dbFile = m_storage->filename();
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std::vector<util::StatusObject> statsObjs;
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statsObjs.reserve(m_peerStats.size());
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LogInfo("Building peer stats...");
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for (const auto& pair : m_peerStats)
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{
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LogInfo("Stat here");
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statsObjs.push_back(pair.second.toJson());
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}
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util::StatusObject obj{
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{"dbLoaded", loaded},
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{"dbFile", dbFile},
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{"lastFlushMs", m_lastFlush.load().count()},
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{"stats", statsObjs},
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};
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return obj;
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}
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}; // namespace llarp
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