81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
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#ifndef VANETZA_CERTIFICATE_CACHE_HPP
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#define VANETZA_CERTIFICATE_CACHE_HPP
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#include <vanetza/common/clock.hpp>
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#include <vanetza/common/runtime.hpp>
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#include <vanetza/security/v2/certificate.hpp>
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#include <boost/heap/binomial_heap.hpp>
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#include <list>
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#include <map>
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namespace vanetza
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{
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namespace security
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{
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namespace v2
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{
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/**
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* CertificateCache remembers validated certificates for some time.
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* This is necessary for certificate lookup when only its digest is known.
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*/
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class CertificateCache
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{
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public:
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CertificateCache(const Runtime& rt);
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/**
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* Puts a (validated) certificate into the cache.
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*
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* \param certificate certificate to add to the cache
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*/
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void insert(const Certificate& certificate);
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/**
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* Lookup certificates based on the passed HashedId8.
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*
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* \param id hash identifier of the certificate
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* \param type type of certificate to lookup
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* \return all stored certificates matching the passed identifier and type
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*/
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std::list<Certificate> lookup(const HashedId8& id, SubjectType type);
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/**
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* Number of currently stored certificates
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* \return cache size
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*/
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std::size_t size() const { return m_certificates.size(); }
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private:
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struct CachedCertificate;
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using map_type = std::multimap<HashedId8, CachedCertificate>;
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struct Expiry : public Clock::time_point
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{
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Expiry(Clock::time_point, map_type::iterator);
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const map_type::iterator certificate;
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};
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using heap_type = boost::heap::binomial_heap<Expiry, boost::heap::compare<std::greater<Expiry>>>;
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struct CachedCertificate
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{
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Certificate certificate;
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heap_type::handle_type handle;
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};
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const Runtime& m_runtime;
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heap_type m_expiries;
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map_type m_certificates;
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void drop_expired();
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bool is_expired(const Expiry&) const;
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void refresh(heap_type::handle_type&, Clock::duration);
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};
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} // namespace v2
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} // namespace security
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} // namespace vanetza
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#endif /* VANETZA_CERTIFICATE_CACHE_HPP */
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