void instance::write(execution_unit* ctx, buffer_type& buf,
header& hdr, payload_writer* pw) {
CAF_LOG_TRACE(CAF_ARG(hdr));
try {
if (pw) {
auto pos = buf.size();
// write payload first (skip first 72 bytes and write header later)
char placeholder[basp::header_size];
buf.insert(buf.end(), std::begin(placeholder), std::end(placeholder));
binary_serializer bs{ctx, buf};
(*pw)(bs);
auto plen = buf.size() - pos - basp::header_size;
CAF_ASSERT(plen <= std::numeric_limits<uint32_t>::max());
hdr.payload_len = static_cast<uint32_t>(plen);
stream_serializer<charbuf> out{ctx, buf.data() + pos, basp::header_size};
out << hdr;
} else {
binary_serializer bs{ctx, buf};
bs << hdr;
}
}
catch (std::exception& e) {
CAF_LOG_ERROR(CAF_ARG(e.what()));
}
}
static http::request_data assemble(http::request_data const& data, buffer_type& header)
{
namespace spirit = boost::spirit;
char const sp[] = " ";
char const ver[] = "HTTP/";
char const crlf[] = "\r\n";
//! собираем start-line
header.insert(header.end(), data.method.begin(), data.method.end());
header.insert(header.end(), sp, sp + sizeof(sp) - 1);
header.insert(header.end(), data.uri.begin(), data.uri.end());
header.insert(header.end(), sp, sp + sizeof(sp) - 1);
header.insert(header.end(), ver, ver + sizeof(ver) - 1);
header.insert(header.end(), data.ver.begin(), data.ver.end());
header.insert(header.end(), crlf, crlf + sizeof(crlf) - 1);
//! собираем message-header в плоский буфер
detail::assemble(data.hdrs, header);
//! разбираем сформированнй буфер и создаем структуру пакета
http::request_data req_data;
http::request req(&req_data);
char const* begin = &header[0];
char const* end = &header[0] + header.size();
spirit::parse_info<> info = spirit::parse(begin, end, req);
return req_data;
}
void instance::write(buffer_type& buf,
message_type operation,
uint32_t* payload_len,
uint64_t operation_data,
const node_id& source_node,
const node_id& dest_node,
actor_id source_actor,
actor_id dest_actor,
payload_writer* pw) {
if (! pw) {
binary_serializer bs{std::back_inserter(buf), &get_namespace()};
source_node.serialize(bs);
dest_node.serialize(bs);
bs.write(source_actor)
.write(dest_actor)
.write(uint32_t{0})
.write(static_cast<uint32_t>(operation))
.write(operation_data);
} else {
// reserve space in the buffer to write the payload later on
auto wr_pos = static_cast<ptrdiff_t>(buf.size());
char placeholder[basp::header_size];
buf.insert(buf.end(), std::begin(placeholder), std::end(placeholder));
auto pl_pos = buf.size();
{ // lifetime scope of first serializer (write payload)
binary_serializer bs1{std::back_inserter(buf), &get_namespace()};
(*pw)(bs1);
}
// write broker message to the reserved space
binary_serializer bs2{buf.begin() + wr_pos, &get_namespace()};
auto plen = static_cast<uint32_t>(buf.size() - pl_pos);
source_node.serialize(bs2);
dest_node.serialize(bs2);
bs2.write(source_actor)
.write(dest_actor)
.write(plen)
.write(static_cast<uint32_t>(operation))
.write(operation_data);
if (payload_len)
*payload_len = plen;
}
}