71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
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/// @file party/key_io.hpp
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/// @brief Ship a copyable DPF key as a framed byte blob.
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#ifndef LIBDPF_PARTY_KEY_IO_HPP__
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#define LIBDPF_PARTY_KEY_IO_HPP__
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#include <cstdint>
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#include <cstring>
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#include <new>
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#include <stdexcept>
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#include <utility>
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#include <vector>
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#include "dpf/net/channel.hpp"
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#include "dpf/net/trio.hpp"
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namespace dpf
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{
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namespace party
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{
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template <typename Key>
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void send_key(net::channel & c, const Key & key)
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{
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Key copy(key);
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c.send_bytes(net::msg::dpf_key,
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reinterpret_cast<const std::uint8_t *>(©), sizeof(Key));
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}
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template <typename Key>
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Key recv_key(net::channel & c)
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{
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auto body = c.recv_bytes(net::msg::dpf_key);
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if (body.size() != sizeof(Key))
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throw std::runtime_error("recv_key size mismatch");
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alignas(Key) unsigned char raw[sizeof(Key)];
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std::memcpy(raw, body.data(), sizeof(Key));
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Key * p = std::launder(reinterpret_cast<Key *>(raw));
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Key out(std::move(*p));
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p->~Key();
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return out;
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}
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/// @brief Send a key blob through the trio hook (or mesh when unset).
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template <typename Key>
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void send_key(net::trio & net, net::role peer, const Key & key)
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{
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Key copy(key);
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net.send_bytes_to(peer, net::msg::dpf_key,
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reinterpret_cast<const std::uint8_t *>(©), sizeof(Key));
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}
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/// @brief Receive a key blob through the trio hook (or mesh when unset).
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template <typename Key>
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Key recv_key(net::trio & net, net::role peer)
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{
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auto body = net.recv_bytes_from(peer, net::msg::dpf_key);
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if (body.size() != sizeof(Key))
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throw std::runtime_error("recv_key size mismatch");
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alignas(Key) unsigned char raw[sizeof(Key)];
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std::memcpy(raw, body.data(), sizeof(Key));
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Key * p = std::launder(reinterpret_cast<Key *>(raw));
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Key out(std::move(*p));
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p->~Key();
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return out;
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}
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} // namespace party
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} // namespace dpf
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#endif // LIBDPF_PARTY_KEY_IO_HPP__
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