Ashin Walpola
0e9525162d
obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but that tree was gitignored, so a clone of this repository could not build the firmware it ships. It is now committed here as ordinary files in its own folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP bridge's signature verification (--trust) used on the bench. Nothing is fetched from or pushed to the colleague's repository; this repository and its remotes carry everything. The folder's own .gitignore keeps build output, downloaded components and private key material out, as it did there; the committed file set is identical to that repository's tracked files. The ESP32-C5 is still flashed from obu-firmware/, which only takes vanetza-idf from microbu-esp32c5/, so the two stay separate folders. FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
135 lines
3.2 KiB
C++
135 lines
3.2 KiB
C++
#ifndef PACKET_BUFFER_HPP_U97KIBQC
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#define PACKET_BUFFER_HPP_U97KIBQC
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#include <vanetza/common/clock.hpp>
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#include <vanetza/geonet/packet.hpp>
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#include <vanetza/geonet/pdu.hpp>
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#include <vanetza/geonet/timestamp.hpp>
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#include <vanetza/net/mac_address.hpp>
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#include <functional>
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#include <list>
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#include <memory>
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namespace vanetza
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{
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namespace geonet
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{
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namespace packet_buffer
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{
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class Expiry
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{
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public:
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Expiry(Clock::time_point now, Clock::duration lifetime);
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bool is_expired(Clock::time_point now) const;
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Clock::time_point buffered_since() const { return m_buffered_since; }
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Clock::time_point expires_at() const { return m_expires_at; }
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private:
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Clock::time_point m_buffered_since;
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Clock::time_point m_expires_at;
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};
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class Data
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{
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public:
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/**
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* Length of packet data
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* \return length in bytes
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*/
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virtual std::size_t length() const = 0;
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/**
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* Reduce lifetime associated with data
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* \param d reduce lifetime by given duration
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* \return remaining lifetime (never negative)
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*/
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virtual Clock::duration reduce_lifetime(Clock::duration d) = 0;
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/**
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* Flush data
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* \note length() and lifetime() should not be called afterwards!
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*/
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virtual void flush() = 0;
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virtual ~Data() {}
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};
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} // namespace packet_buffer
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/**
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* PacketBuffer with bounded capacity, packet expiry and head-drop
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*/
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class PacketBuffer
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{
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public:
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typedef std::unique_ptr<packet_buffer::Data> data_ptr;
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/**
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* Create PacketBuffer with given capacity
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* \param capacity Buffer can store this many bytes
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*/
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PacketBuffer(std::size_t capacity);
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/**
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* Push one packet into buffer
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* \param packet Packet data
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* \param t Current time
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* \return true if packet has been pushed successfully
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*/
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bool push(data_ptr packet, Clock::time_point t);
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/**
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* Flush packets from buffer. Expired packets are dropped.
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* \note Some packets might remain in buffer (re-added during flushing)
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* \param t Current time
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*/
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void flush(Clock::time_point t);
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private:
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typedef packet_buffer::Expiry expiry_type;
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typedef std::tuple<expiry_type, data_ptr> node_type;
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std::size_t free() const { return m_capacity - m_stored; }
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std::size_t capacity() const { return m_capacity; }
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/**
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* Push one new element into buffer list
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* \note capacity is not checked by this method, has to be done manually
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* \param expiry Expiry data
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* \param packet Packet data
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*/
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void push(expiry_type&& expiry, data_ptr packet);
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/**
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* Drop current head element
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* \return true if head element was dropped
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*/
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bool drop_head();
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/**
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* Drop all packets with expired timestamp
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* \param t current time
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*/
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void drop_expired(Clock::time_point t);
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/**
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* Drop as many packets as required to store given number of bytes.
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* Packets at the head of the list are dropped first.
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* \param bytes require #bytes free capacity
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* \return true if there is enough capacity left for #bytes
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*/
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bool drop(std::size_t bytes);
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std::list<node_type> m_nodes;
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std::size_t m_capacity;
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std::size_t m_stored;
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};
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} // namespace geonet
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} // namespace vanetza
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#endif /* PACKET_BUFFER_HPP_U97KIBQC */
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