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156 lines
3.5 KiB
C++
156 lines
3.5 KiB
C++
#pragma once
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#include "pathset.hpp"
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#include <llarp/util/status.hpp>
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#include <llarp/util/decaying_hashset.hpp>
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#include <atomic>
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#include <set>
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namespace llarp
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{
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namespace path
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{
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// milliseconds waiting between builds on a path per router
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static constexpr auto MIN_PATH_BUILD_INTERVAL = 500ms;
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static constexpr auto PATH_BUILD_RATE = 100ms;
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/// limiter for path builds
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/// prevents overload and such
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class BuildLimiter
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{
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util::DecayingHashSet<RouterID> m_EdgeLimiter;
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public:
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/// attempt a build
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/// return true if we are allowed to continue
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bool
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Attempt(const RouterID& router);
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/// decay limit entries
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void
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Decay(llarp_time_t now);
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/// return true if this router is currently limited
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bool
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Limited(const RouterID& router) const;
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};
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struct Builder : public PathSet
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{
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private:
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llarp_time_t m_LastWarn = 0s;
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protected:
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/// flag for PathSet::Stop()
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std::atomic<bool> _run;
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virtual bool
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UrgentBuild(llarp_time_t now) const;
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/// return true if we hit our soft limit for building paths too fast on a first hop
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bool
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BuildCooldownHit(RouterID edge) const;
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private:
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void
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DoPathBuildBackoff();
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public:
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AbstractRouter* const m_router;
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SecretKey enckey;
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size_t numHops;
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llarp_time_t lastBuild = 0s;
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llarp_time_t buildIntervalLimit = MIN_PATH_BUILD_INTERVAL;
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/// construct
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Builder(AbstractRouter* p_router, size_t numDesiredPaths, size_t numHops);
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virtual ~Builder() = default;
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util::StatusObject
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ExtractStatus() const;
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bool
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ShouldBuildMore(llarp_time_t now) const override;
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/// should we bundle RCs in builds?
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virtual bool
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ShouldBundleRC() const = 0;
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void
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ResetInternalState() override;
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/// return true if we hit our soft limit for building paths too fast
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bool
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BuildCooldownHit(llarp_time_t now) const;
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/// get roles for this path builder
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virtual PathRole
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GetRoles() const
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{
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return ePathRoleAny;
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}
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BuildStats
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CurrentBuildStats() const
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{
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return m_BuildStats;
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}
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bool
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Stop() override;
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bool
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IsStopped() const override;
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bool
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ShouldRemove() const override;
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llarp_time_t
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Now() const override;
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virtual void
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Tick(llarp_time_t now) override;
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void
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BuildOne(PathRole roles = ePathRoleAny) override;
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bool
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BuildOneAlignedTo(const RouterID endpoint) override;
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std::optional<std::vector<RouterContact>>
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GetHopsAlignedToForBuild(RouterID endpoint, const std::set<RouterID>& exclude = {});
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void
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Build(std::vector<RouterContact> hops, PathRole roles = ePathRoleAny) override;
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/// pick a first hop
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std::optional<RouterContact>
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SelectFirstHop(const std::set<RouterID>& exclude = {}) const;
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virtual std::optional<std::vector<RouterContact>>
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GetHopsForBuild() override;
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void
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ManualRebuild(size_t N, PathRole roles = ePathRoleAny);
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virtual const SecretKey&
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GetTunnelEncryptionSecretKey() const;
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virtual void
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HandlePathBuilt(Path_ptr p) override;
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virtual void
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HandlePathBuildTimeout(Path_ptr p) override;
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virtual void
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HandlePathBuildFailedAt(Path_ptr p, RouterID hop) override;
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};
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using Builder_ptr = std::shared_ptr<Builder>;
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} // namespace path
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} // namespace llarp
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