/*
 * =====================================================================================
 *
 *       Filename:  shm.cpp
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月22日 16时19分36秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  YOUR NAME (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#include "shm.h"
#include "bh_util.h"
#include <mutex>
#include <boost/uuid/uuid_io.hpp>
#include <boost/uuid/uuid_generators.hpp>

namespace bhome_shm {
using namespace boost::interprocess;
using namespace boost::uuids;

namespace {
std::string MsgQIdToName(const MQId& id) { return "shmq" + to_string(id); }
MQId EmptyId() { return nil_uuid(); }
MQId NewId() { return random_generator()(); }
}

ShmMsgQueue::ShmMsgQueue(MQId id, ShmType &segment, const uint32_t len):
SharedQueue(segment, MsgQIdToName(id), id, len, segment.get_segment_manager())
{
    printf("queue size: %ld cap: %ld\n", data()->size(), data()->capacity());
}
ShmMsgQueue::ShmMsgQueue(ShmType &segment, const uint32_t len):ShmMsgQueue(NewId(), segment, len) {}

ShmMsgQueue::~ShmMsgQueue()
{
    Remove();
}

bool ShmMsgQueue::Send(MQId remote_id, const void *data, const size_t size, const int timeout_ms)
{
    if (data && size) {
        Queue *remote = find(MsgQIdToName(remote_id));
        if (remote) {
            void *p = shm().allocate(size, std::nothrow);
            bool r = false;
            if (p) {
                Msg buf = { Id(), p, size};
                memcpy(p, data, size);
                if (remote->Write(buf, timeout_ms)) {
                    return true;
                } else {
                    shm().deallocate(p);
                }
            }
        }
    }
    return false;
}

bool ShmMsgQueue::Recv(MQId &source_id, void *&data, size_t &size, const int timeout_ms)
{
    Msg buf;
    if (Read(buf, timeout_ms) && buf.size_ > 0) {
        DEFER1(shm().deallocate(buf.data_.get()););
        source_id = buf.src_;
        size = buf.size_;
        if (data = malloc(size)) {
            memcpy(data, buf.data_.get(), size);
            return true;
        }
    }
    source_id = EmptyId();
    data = 0;
    size = 0;
    return false;
}

} // namespace bhome_shm