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Zero-copy TX: span_writer packer, static buffers, no vector returns

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Ian Gulliver
2026-04-10 22:18:44 +09:00
parent 94895fd2fe
commit e2a5d97dae
10 changed files with 173 additions and 133 deletions
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11
firmware/include/dispatch.h
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@@ -2,10 +2,9 @@
#include <cstdint>
#include <functional>
#include <span>
#include <vector>
#include "wire.h"
using handler_fn = std::vector<std::vector<uint8_t>> (*)(uint32_t message_id, std::span<const uint8_t> payload);
using handler_fn = size_t (*)(uint32_t message_id, std::span<const uint8_t> payload, span_writer &out);
struct handler_entry {
int8_t type_id;
@@ -13,16 +12,16 @@ struct handler_entry {
};
template <typename Req, auto Fn>
std::vector<std::vector<uint8_t>> typed_handler(uint32_t message_id, std::span<const uint8_t> payload) {
size_t typed_handler(uint32_t message_id, std::span<const uint8_t> payload, span_writer &out) {
msgpack::parser p(payload.data(), static_cast<int>(payload.size()));
Req req;
auto tup = req.as_tuple();
auto r = msgpack::unpack(p, tup);
if (!r) {
return {encode_response(message_id, DeviceError{1, "decode request ext_id=" +
std::to_string(Req::ext_id) + ": msgpack error " + std::to_string(static_cast<int>(r.error()))})};
return encode_response_into(out, message_id, DeviceError{1, "decode request ext_id=" +
std::to_string(Req::ext_id) + ": msgpack error " + std::to_string(static_cast<int>(r.error()))});
}
return Fn(message_id, req);
return Fn(message_id, req, out);
}
void dispatch_init();