52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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#pragma once
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#include <cstdint>
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#include <vector>
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#include "msgpackpp.h"
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#include "halfsiphash.h"
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#include "static_vector.h"
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#include "protocol.h"
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static constexpr uint8_t hash_key[8] = {};
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struct DecodedMessage {
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uint32_t message_id;
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int8_t type_id;
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};
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inline std::vector<uint8_t> pack_envelope(uint32_t message_id, const std::vector<uint8_t> &payload) {
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uint32_t checksum = halfsiphash::hash32(payload.data(), payload.size(), hash_key);
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msgpackpp::packer p;
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p.pack(Envelope{message_id, checksum, payload});
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return p.get_payload();
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}
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template <typename T>
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inline std::vector<uint8_t> encode_response(uint32_t message_id, const T &msg) {
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msgpackpp::packer inner;
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inner.pack(msg);
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return pack_envelope(message_id, inner.get_payload());
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}
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inline msgpackpp::result<DecodedMessage> try_decode(const uint8_t *data, size_t len) {
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msgpackpp::parser p(data, static_cast<int>(len));
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Envelope env;
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auto r = msgpackpp::unpack(p, env);
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if (!r) return std::unexpected(r.error());
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uint32_t expected = halfsiphash::hash32(env.payload.data(), env.payload.size(), hash_key);
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if (env.checksum != expected) return std::unexpected(msgpackpp::error_code::invalid);
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msgpackpp::parser inner(env.payload.data(), static_cast<int>(env.payload.size()));
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if (!inner.is_ext()) return std::unexpected(msgpackpp::error_code::type_error);
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auto ext = inner.get_ext();
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if (!ext) return std::unexpected(ext.error());
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return DecodedMessage{env.message_id, std::get<0>(*ext)};
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}
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template <size_t N>
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inline msgpackpp::result<DecodedMessage> try_decode(const static_vector<uint8_t, N> &buf) {
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return try_decode(buf.data(), buf.size());
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}
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