#include "osd.h"

void osd_t::outbox_push(osd_client_t & cl, osd_op_t *cur_op)
{
    assert(cur_op->peer_fd);
    if (cur_op->op_type == OSD_OP_OUT)
    {
        gettimeofday(&cur_op->tv_begin, NULL);
    }
    if (cl.write_state == 0)
    {
        cl.write_state = CL_WRITE_READY;
        write_ready_clients.push_back(cur_op->peer_fd);
    }
    cl.outbox.push_back(cur_op);
    ringloop->wakeup();
}

void osd_t::send_replies()
{
    for (int i = 0; i < write_ready_clients.size(); i++)
    {
        int peer_fd = write_ready_clients[i];
        auto & cl = clients[peer_fd];
        io_uring_sqe* sqe = ringloop->get_sqe();
        if (!sqe)
        {
            write_ready_clients.erase(write_ready_clients.begin(), write_ready_clients.begin() + i);
            return;
        }
        ring_data_t* data = ((ring_data_t*)sqe->user_data);
        if (!cl.write_op)
        {
            // pick next command
            cl.write_op = cl.outbox.front();
            cl.outbox.pop_front();
            cl.write_state = CL_WRITE_REPLY;
            if (cl.write_op->op_type == OSD_OP_OUT)
            {
                gettimeofday(&cl.write_op->tv_send, NULL);
            }
            else
            {
                // Measure execution latency
                timeval tv_end;
                gettimeofday(&tv_end, NULL);
                op_stat_count[cl.write_op->req.hdr.opcode]++;
                op_stat_sum[cl.write_op->req.hdr.opcode] += (
                    (tv_end.tv_sec - cl.write_op->tv_begin.tv_sec)*1000000 +
                    tv_end.tv_usec - cl.write_op->tv_begin.tv_usec
                );
            }
        }
        cl.write_msg.msg_iov = cl.write_op->send_list.get_iovec();
        cl.write_msg.msg_iovlen = cl.write_op->send_list.get_size();
        data->callback = [this, peer_fd](ring_data_t *data) { handle_send(data, peer_fd); };
        my_uring_prep_sendmsg(sqe, peer_fd, &cl.write_msg, 0);
    }
    write_ready_clients.clear();
}

void osd_t::handle_send(ring_data_t *data, int peer_fd)
{
    auto cl_it = clients.find(peer_fd);
    if (cl_it != clients.end())
    {
        auto & cl = cl_it->second;
        if (data->res < 0 && data->res != -EAGAIN)
        {
            // this is a client socket, so don't panic. just disconnect it
            printf("Client %d socket write error: %d (%s). Disconnecting client\n", peer_fd, -data->res, strerror(-data->res));
            stop_client(peer_fd);
            return;
        }
        if (data->res >= 0)
        {
            osd_op_t *cur_op = cl.write_op;
            while (data->res > 0 && cur_op->send_list.sent < cur_op->send_list.count)
            {
                iovec & iov = cur_op->send_list.buf[cur_op->send_list.sent];
                if (iov.iov_len <= data->res)
                {
                    data->res -= iov.iov_len;
                    cur_op->send_list.sent++;
                }
                else
                {
                    iov.iov_len -= data->res;
                    iov.iov_base += data->res;
                    break;
                }
            }
            if (cur_op->send_list.sent >= cur_op->send_list.count)
            {
                // Done
                if (cur_op->op_type == OSD_OP_IN)
                {
                    delete cur_op;
                }
                else
                {
                    // Measure subops with data
                    if (cur_op->req.hdr.opcode == OSD_OP_SECONDARY_STABILIZE ||
                        cur_op->req.hdr.opcode == OSD_OP_SECONDARY_WRITE)
                    {
                        timeval tv_end;
                        gettimeofday(&tv_end, NULL);
                        send_stat_count++;
                        send_stat_sum += (
                            (tv_end.tv_sec - cl.write_op->tv_send.tv_sec)*1000000 +
                            tv_end.tv_usec - cl.write_op->tv_send.tv_usec
                        );
                    }
                    cl.sent_ops[cl.write_op->req.hdr.id] = cl.write_op;
                }
                cl.write_op = NULL;
                cl.write_state = cl.outbox.size() > 0 ? CL_WRITE_READY : 0;
            }
        }
        if (cl.write_state != 0)
        {
            write_ready_clients.push_back(peer_fd);
        }
    }
}