Simplified distributed block storage with strong consistency, like in Ceph
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// Copyright (c) Vitaliy Filippov, 2019+
// License: VNPL-1.0 or GNU GPL-2.0+ (see README.md for details)
/**
* Stub "OSD" implemented on top of osd_messenger to test & compare
* network performance with sync read/write and io_uring
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <stdexcept>
#include "ringloop.h"
#include "epoll_manager.h"
#include "messenger.h"
int bind_stub(const char *bind_address, int bind_port);
void stub_exec_op(osd_messenger_t *msgr, osd_op_t *op);
int main(int narg, char *args[])
{
ring_consumer_t looper;
ring_loop_t *ringloop = new ring_loop_t(512);
epoll_manager_t *epmgr = new epoll_manager_t(ringloop);
osd_messenger_t *msgr = new osd_messenger_t();
msgr->osd_num = 1351;
msgr->tfd = epmgr->tfd;
msgr->ringloop = ringloop;
msgr->repeer_pgs = [](osd_num_t) {};
msgr->exec_op = [msgr](osd_op_t *op) { stub_exec_op(msgr, op); };
// Accept new connections
int listen_fd = bind_stub("0.0.0.0", 11203);
epmgr->set_fd_handler(listen_fd, false, [listen_fd, msgr](int fd, int events)
{
msgr->accept_connections(listen_fd);
});
looper.loop = [msgr, ringloop]()
{
msgr->read_requests();
msgr->send_replies();
ringloop->submit();
};
ringloop->register_consumer(&looper);
printf("stub_uring_osd: waiting for clients\n");
while (true)
{
ringloop->loop();
ringloop->wait();
}
delete msgr;
delete epmgr;
delete ringloop;
return 0;
}
int bind_stub(const char *bind_address, int bind_port)
{
int listen_backlog = 128;
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
{
throw std::runtime_error(std::string("socket: ") + strerror(errno));
}
int enable = 1;
setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
sockaddr_in addr;
int r;
if ((r = inet_pton(AF_INET, bind_address, &addr.sin_addr)) != 1)
{
close(listen_fd);
throw std::runtime_error("bind address "+std::string(bind_address)+(r == 0 ? " is not valid" : ": no ipv4 support"));
}
addr.sin_family = AF_INET;
addr.sin_port = htons(bind_port);
if (bind(listen_fd, (sockaddr*)&addr, sizeof(addr)) < 0)
{
close(listen_fd);
throw std::runtime_error(std::string("bind: ") + strerror(errno));
}
if (listen(listen_fd, listen_backlog) < 0)
{
close(listen_fd);
throw std::runtime_error(std::string("listen: ") + strerror(errno));
}
fcntl(listen_fd, F_SETFL, fcntl(listen_fd, F_GETFL, 0) | O_NONBLOCK);
return listen_fd;
}
void stub_exec_op(osd_messenger_t *msgr, osd_op_t *op)
{
op->reply.hdr.magic = SECONDARY_OSD_REPLY_MAGIC;
op->reply.hdr.id = op->req.hdr.id;
op->reply.hdr.opcode = op->req.hdr.opcode;
if (op->req.hdr.opcode == OSD_OP_SEC_READ)
{
op->reply.hdr.retval = op->req.sec_rw.len;
op->buf = malloc(op->req.sec_rw.len);
op->iov.push_back(op->buf, op->req.sec_rw.len);
}
else if (op->req.hdr.opcode == OSD_OP_SEC_WRITE || op->req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE)
{
op->reply.hdr.retval = op->req.sec_rw.len;
}
else if (op->req.hdr.opcode == OSD_OP_TEST_SYNC_STAB_ALL)
{
op->reply.hdr.retval = 0;
}
else
{
printf("client %d: unsupported stub opcode: %lu\n", op->peer_fd, op->req.hdr.opcode);
op->reply.hdr.retval = -EINVAL;
}
msgr->outbox_push(op);
}