Vitaliy Filippov
4a2dcf7b6b
VNPL 1.1 is slightly reworded to make it clear that proprietary software interacting with Vitastor and providing some kind of service to end users isn't a "Proxy Program" if it's not specially designed to be used with Vitastor. For example, Windows OS running in a virtual machine stored in a Vitastor cluster clearly isn't.
333 lines
11 KiB
C++
333 lines
11 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
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#include "messenger.h"
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void osd_messenger_t::read_requests()
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{
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for (int i = 0; i < read_ready_clients.size(); i++)
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{
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int peer_fd = read_ready_clients[i];
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osd_client_t *cl = clients[peer_fd];
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if (cl->read_msg.msg_iovlen)
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{
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continue;
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}
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if (cl->read_remaining < receive_buffer_size)
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{
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cl->read_iov.iov_base = cl->in_buf;
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cl->read_iov.iov_len = receive_buffer_size;
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cl->read_msg.msg_iov = &cl->read_iov;
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cl->read_msg.msg_iovlen = 1;
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}
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else
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{
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cl->read_iov.iov_base = 0;
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cl->read_iov.iov_len = cl->read_remaining;
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cl->read_msg.msg_iov = cl->recv_list.get_iovec();
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cl->read_msg.msg_iovlen = cl->recv_list.get_size();
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}
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cl->refs++;
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if (ringloop && !use_sync_send_recv)
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{
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io_uring_sqe* sqe = ringloop->get_sqe();
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if (!sqe)
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{
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cl->read_msg.msg_iovlen = 0;
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read_ready_clients.erase(read_ready_clients.begin(), read_ready_clients.begin() + i);
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return;
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}
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ring_data_t* data = ((ring_data_t*)sqe->user_data);
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data->callback = [this, cl](ring_data_t *data) { handle_read(data->res, cl); };
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my_uring_prep_recvmsg(sqe, peer_fd, &cl->read_msg, 0);
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}
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else
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{
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int result = recvmsg(peer_fd, &cl->read_msg, 0);
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if (result < 0)
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{
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result = -errno;
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}
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handle_read(result, cl);
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}
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}
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read_ready_clients.clear();
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}
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bool osd_messenger_t::handle_read(int result, osd_client_t *cl)
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{
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bool ret = false;
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cl->read_msg.msg_iovlen = 0;
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cl->refs--;
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if (cl->peer_state == PEER_STOPPED)
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{
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if (cl->refs <= 0)
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{
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delete cl;
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}
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return false;
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}
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if (result <= 0 && result != -EAGAIN)
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{
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// this is a client socket, so don't panic on error. just disconnect it
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if (result != 0)
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{
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printf("Client %d socket read error: %d (%s). Disconnecting client\n", cl->peer_fd, -result, strerror(-result));
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}
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stop_client(cl->peer_fd);
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return false;
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}
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if (result == -EAGAIN || result < cl->read_iov.iov_len)
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{
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cl->read_ready--;
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if (cl->read_ready > 0)
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read_ready_clients.push_back(cl->peer_fd);
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}
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else
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{
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read_ready_clients.push_back(cl->peer_fd);
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}
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if (result > 0)
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{
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if (cl->read_iov.iov_base == cl->in_buf)
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{
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// Compose operation(s) from the buffer
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int remain = result;
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void *curbuf = cl->in_buf;
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while (remain > 0)
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{
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if (!cl->read_op)
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{
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cl->read_op = new osd_op_t;
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cl->read_op->peer_fd = cl->peer_fd;
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cl->read_op->op_type = OSD_OP_IN;
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cl->recv_list.push_back(cl->read_op->req.buf, OSD_PACKET_SIZE);
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cl->read_remaining = OSD_PACKET_SIZE;
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cl->read_state = CL_READ_HDR;
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}
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while (cl->recv_list.done < cl->recv_list.count && remain > 0)
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{
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iovec* cur = cl->recv_list.get_iovec();
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if (cur->iov_len > remain)
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{
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memcpy(cur->iov_base, curbuf, remain);
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cl->read_remaining -= remain;
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cur->iov_len -= remain;
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cur->iov_base += remain;
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remain = 0;
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}
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else
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{
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memcpy(cur->iov_base, curbuf, cur->iov_len);
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curbuf += cur->iov_len;
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cl->read_remaining -= cur->iov_len;
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remain -= cur->iov_len;
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cur->iov_len = 0;
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cl->recv_list.done++;
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}
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}
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if (cl->recv_list.done >= cl->recv_list.count)
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{
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if (!handle_finished_read(cl))
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{
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goto fin;
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}
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}
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}
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}
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else
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{
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// Long data
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cl->read_remaining -= result;
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cl->recv_list.eat(result);
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if (cl->recv_list.done >= cl->recv_list.count)
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{
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handle_finished_read(cl);
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}
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}
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if (result >= cl->read_iov.iov_len)
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{
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ret = true;
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}
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}
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fin:
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for (auto cb: set_immediate)
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{
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cb();
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}
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set_immediate.clear();
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return ret;
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}
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bool osd_messenger_t::handle_finished_read(osd_client_t *cl)
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{
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cl->recv_list.reset();
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if (cl->read_state == CL_READ_HDR)
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{
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if (cl->read_op->req.hdr.magic == SECONDARY_OSD_REPLY_MAGIC)
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return handle_reply_hdr(cl);
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else if (cl->read_op->req.hdr.magic == SECONDARY_OSD_OP_MAGIC)
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handle_op_hdr(cl);
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else
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{
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printf("Received garbage: magic=%lx id=%lu opcode=%lx from %d\n", cl->read_op->req.hdr.magic, cl->read_op->req.hdr.id, cl->read_op->req.hdr.opcode, cl->peer_fd);
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stop_client(cl->peer_fd);
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return false;
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}
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}
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else if (cl->read_state == CL_READ_DATA)
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{
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// Operation is ready
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cl->received_ops.push_back(cl->read_op);
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set_immediate.push_back([this, op = cl->read_op]() { exec_op(op); });
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cl->read_op = NULL;
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cl->read_state = 0;
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}
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else if (cl->read_state == CL_READ_REPLY_DATA)
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{
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// Reply is ready
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handle_reply_ready(cl->read_op);
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cl->read_op = NULL;
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cl->read_state = 0;
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}
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else
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{
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assert(0);
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}
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return true;
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}
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void osd_messenger_t::handle_op_hdr(osd_client_t *cl)
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{
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osd_op_t *cur_op = cl->read_op;
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if (cur_op->req.hdr.opcode == OSD_OP_SEC_READ)
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{
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if (cur_op->req.sec_rw.len > 0)
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cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_rw.len);
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cl->read_remaining = 0;
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}
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else if (cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE ||
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cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE)
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{
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if (cur_op->req.sec_rw.len > 0)
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cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_rw.len);
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cl->read_remaining = cur_op->req.sec_rw.len;
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}
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else if (cur_op->req.hdr.opcode == OSD_OP_SEC_STABILIZE ||
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cur_op->req.hdr.opcode == OSD_OP_SEC_ROLLBACK)
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{
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if (cur_op->req.sec_stab.len > 0)
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cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.sec_stab.len);
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cl->read_remaining = cur_op->req.sec_stab.len;
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}
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else if (cur_op->req.hdr.opcode == OSD_OP_READ)
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{
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cl->read_remaining = 0;
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}
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else if (cur_op->req.hdr.opcode == OSD_OP_WRITE)
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{
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if (cur_op->req.rw.len > 0)
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cur_op->buf = memalign_or_die(MEM_ALIGNMENT, cur_op->req.rw.len);
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cl->read_remaining = cur_op->req.rw.len;
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}
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if (cl->read_remaining > 0)
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{
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// Read data
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cl->recv_list.push_back(cur_op->buf, cl->read_remaining);
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cl->read_state = CL_READ_DATA;
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}
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else
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{
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// Operation is ready
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cl->received_ops.push_back(cur_op);
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set_immediate.push_back([this, cur_op]() { exec_op(cur_op); });
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cl->read_op = NULL;
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cl->read_state = 0;
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}
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}
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bool osd_messenger_t::handle_reply_hdr(osd_client_t *cl)
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{
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auto req_it = cl->sent_ops.find(cl->read_op->req.hdr.id);
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if (req_it == cl->sent_ops.end())
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{
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// Command out of sync. Drop connection
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printf("Client %d command out of sync: id %lu\n", cl->peer_fd, cl->read_op->req.hdr.id);
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stop_client(cl->peer_fd);
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return false;
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}
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osd_op_t *op = req_it->second;
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memcpy(op->reply.buf, cl->read_op->req.buf, OSD_PACKET_SIZE);
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cl->sent_ops.erase(req_it);
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if ((op->reply.hdr.opcode == OSD_OP_SEC_READ || op->reply.hdr.opcode == OSD_OP_READ) &&
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op->reply.hdr.retval > 0)
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{
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// Read data. In this case we assume that the buffer is preallocated by the caller (!)
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assert(op->iov.count > 0);
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if (op->reply.hdr.retval != (op->reply.hdr.opcode == OSD_OP_SEC_READ ? op->req.sec_rw.len : op->req.rw.len))
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{
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// Check reply length to not overflow the buffer
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printf("Client %d read reply of different length\n", cl->peer_fd);
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cl->sent_ops[op->req.hdr.id] = op;
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stop_client(cl->peer_fd);
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return false;
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}
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cl->recv_list.append(op->iov);
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delete cl->read_op;
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cl->read_op = op;
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cl->read_state = CL_READ_REPLY_DATA;
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cl->read_remaining = op->reply.hdr.retval;
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}
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else if (op->reply.hdr.opcode == OSD_OP_SEC_LIST && op->reply.hdr.retval > 0)
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{
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assert(!op->iov.count);
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delete cl->read_op;
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cl->read_op = op;
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cl->read_state = CL_READ_REPLY_DATA;
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cl->read_remaining = sizeof(obj_ver_id) * op->reply.hdr.retval;
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op->buf = memalign_or_die(MEM_ALIGNMENT, cl->read_remaining);
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cl->recv_list.push_back(op->buf, cl->read_remaining);
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}
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else if (op->reply.hdr.opcode == OSD_OP_SHOW_CONFIG && op->reply.hdr.retval > 0)
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{
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assert(!op->iov.count);
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delete cl->read_op;
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cl->read_op = op;
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cl->read_state = CL_READ_REPLY_DATA;
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cl->read_remaining = op->reply.hdr.retval;
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op->buf = malloc_or_die(op->reply.hdr.retval);
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cl->recv_list.push_back(op->buf, op->reply.hdr.retval);
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}
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else
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{
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// It's fine to reuse cl->read_op for the next reply
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handle_reply_ready(op);
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cl->recv_list.push_back(cl->read_op->req.buf, OSD_PACKET_SIZE);
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cl->read_remaining = OSD_PACKET_SIZE;
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cl->read_state = CL_READ_HDR;
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}
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return true;
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}
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void osd_messenger_t::handle_reply_ready(osd_op_t *op)
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{
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// Measure subop latency
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timespec tv_end;
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clock_gettime(CLOCK_REALTIME, &tv_end);
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stats.subop_stat_count[op->req.hdr.opcode]++;
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if (!stats.subop_stat_count[op->req.hdr.opcode])
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{
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stats.subop_stat_count[op->req.hdr.opcode]++;
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stats.subop_stat_sum[op->req.hdr.opcode] = 0;
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}
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stats.subop_stat_sum[op->req.hdr.opcode] += (
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(tv_end.tv_sec - op->tv_begin.tv_sec)*1000000 +
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(tv_end.tv_nsec - op->tv_begin.tv_nsec)/1000
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);
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set_immediate.push_back([this, op]()
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{
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// Copy lambda to be unaffected by `delete op`
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std::function<void(osd_op_t*)>(op->callback)(op);
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});
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}
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