Simplified distributed block storage with strong consistency, like in Ceph
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#include "messenger.h"
void osd_messenger_t::outbox_push(osd_op_t *cur_op)
{
assert(cur_op->peer_fd);
auto & cl = clients.at(cur_op->peer_fd);
if (cur_op->op_type == OSD_OP_OUT)
{
clock_gettime(CLOCK_REALTIME, &cur_op->tv_begin);
}
else
{
// Check that operation actually belongs to this client
bool found = false;
for (auto it = cl.received_ops.begin(); it != cl.received_ops.end(); it++)
{
if (*it == cur_op)
{
found = true;
cl.received_ops.erase(it, it+1);
break;
}
}
if (!found)
{
delete cur_op;
return;
}
}
cl.outbox.push_back(cur_op);
if (cl.write_op || cl.outbox.size() > 1 || !try_send(cl))
{
if (cl.write_state == 0)
{
cl.write_state = CL_WRITE_READY;
write_ready_clients.push_back(cur_op->peer_fd);
}
ringloop->wakeup();
}
}
bool osd_messenger_t::try_send(osd_client_t & cl)
{
int peer_fd = cl.peer_fd;
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_IN)
{
// Measure execution latency
timespec tv_end;
clock_gettime(CLOCK_REALTIME, &tv_end);
stats.op_stat_count[cl.write_op->req.hdr.opcode]++;
if (!stats.op_stat_count[cl.write_op->req.hdr.opcode])
{
stats.op_stat_count[cl.write_op->req.hdr.opcode]++;
stats.op_stat_sum[cl.write_op->req.hdr.opcode] = 0;
stats.op_stat_bytes[cl.write_op->req.hdr.opcode] = 0;
}
stats.op_stat_sum[cl.write_op->req.hdr.opcode] += (
(tv_end.tv_sec - cl.write_op->tv_begin.tv_sec)*1000000 +
(tv_end.tv_nsec - cl.write_op->tv_begin.tv_nsec)/1000
);
if (cl.write_op->req.hdr.opcode == OSD_OP_READ ||
cl.write_op->req.hdr.opcode == OSD_OP_WRITE)
{
stats.op_stat_bytes[cl.write_op->req.hdr.opcode] += cl.write_op->req.rw.len;
}
else if (cl.write_op->req.hdr.opcode == OSD_OP_SECONDARY_READ ||
cl.write_op->req.hdr.opcode == OSD_OP_SECONDARY_WRITE)
{
stats.op_stat_bytes[cl.write_op->req.hdr.opcode] += cl.write_op->req.sec_rw.len;
}
}
}
cl.write_msg.msg_iov = cl.write_op->send_list.get_iovec();
cl.write_msg.msg_iovlen = cl.write_op->send_list.get_size();
int result = sendmsg(peer_fd, &cl.write_msg, MSG_NOSIGNAL);
if (result < 0)
result = -errno;
{
timespec now;
clock_gettime(CLOCK_REALTIME, &now);
printf("sendmsg done %s %d %ld.%06ld\n", __FILE__, __LINE__, now.tv_sec, now.tv_nsec/1000);
}
handle_send(result, peer_fd);
return true;
}
void osd_messenger_t::send_replies()
{
while (write_ready_clients.size() > 0)
{
auto & cl = clients[write_ready_clients[0]];
write_ready_clients.erase(write_ready_clients.begin(), write_ready_clients.begin() + 1);
try_send(cl);
}
}
void osd_messenger_t::handle_send(int result, int peer_fd)
{
auto cl_it = clients.find(peer_fd);
if (cl_it != clients.end())
{
auto & cl = cl_it->second;
if (result < 0 && result != -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, -result, strerror(-result));
stop_client(peer_fd);
return;
}
if (result >= 0)
{
osd_op_t *cur_op = cl.write_op;
while (result > 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 <= result)
{
result -= iov.iov_len;
cur_op->send_list.sent++;
}
else
{
iov.iov_len -= result;
iov.iov_base += result;
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
{
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);
}
}
}