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dummy_test.c
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dummy_test.c
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/*
* Copyright 2017 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Dummy workload that exercises the common routines and the control plane. It
* doesn't implement a data plane, that is it doesn't open or operate on data
* sockets. As a side-effect, it can serve as a template/skeleton for new
* workloads. If you're refactoring the other workloads, please update the dummy
* workload as well.
*
* Code is structured the same way as in the existing, full-blown, workloads.
* Parts that are missing but would be there in a fully functional workload are
* marked with placeholder comment (look for STUB markers).
*/
#include <sys/epoll.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include "common.h"
#include "flow.h"
#include "lib.h"
#include "logging.h"
#include "thread.h"
#include "workload.h"
static struct flow fake_flow = {
.fd = -1,
};
static struct epoll_event fake_client_events[] = {
{ .events = EPOLLOUT, .data = { .ptr = &fake_flow } },
{ .events = EPOLLIN, .data = { .ptr = &fake_flow } },
{ .events = EPOLLERR, .data = { .ptr = &fake_flow } },
};
static struct epoll_event fake_server_events[] = {
{ .events = EPOLLIN, .data = { .ptr = &fake_flow } },
{ .events = EPOLLOUT, .data = { .ptr = &fake_flow } },
{ .events = EPOLLERR, .data = { .ptr = &fake_flow } },
};
static struct epoll_event *fake_events;
static size_t n_fake_events;
static void init_fake_events(bool is_client)
{
if (is_client) {
fake_events = fake_client_events;
n_fake_events = ARRAY_SIZE(fake_client_events);
} else {
fake_events = fake_server_events;
n_fake_events = ARRAY_SIZE(fake_server_events);
}
}
static int fake_epoll_wait(int epfd, struct epoll_event *events,
int maxevents, int timeout)
{
static size_t i = 0;
assert(maxevents > 0);
/* Fake an event */
if (i < n_fake_events) {
memcpy(events, &fake_events[i], sizeof(fake_events[i]));
++i;
return 1;
}
return epoll_wait(epfd, events, maxevents, timeout);
}
static int fake_socket_open(const struct addrinfo *hints)
{
int sockfds[2];
int err;
err = socketpair(AF_UNIX, hints->ai_socktype, 0, sockfds);
if (err)
return err;
/* XXX: Leak sockfd[1] */
return sockfds[0];
}
struct socket_ops fake_socket_ops = {
.open = fake_socket_open,
.epoll_wait = fake_epoll_wait,
};
static void client_events(struct thread *t, int epfd,
struct epoll_event *events, int nfds,
int listen_fd, char *buf)
{
struct callbacks *cb = t->cb;
struct flow *flow;
ssize_t num_bytes;
int i;
UNUSED(listen_fd);
for (i = 0; i < nfds; i++) {
flow = events[i].data.ptr;
if (flow->fd == t->stop_efd) {
t->stop = 1;
break;
}
/* STUB: Delete flow on EPOLLRDHUP */
if (events[i].events & EPOLLOUT) {
ssize_t to_write = flow->bytes_to_write;
int flags = 0;
num_bytes = do_write(t->script_slave, flow->fd, buf,
to_write, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "write failed with %zd",
num_bytes);
continue;
}
} else if (events[i].events & EPOLLIN) {
ssize_t to_read = flow->bytes_to_read;
int flags = 0;
num_bytes = do_read(t->script_slave, flow->fd, buf,
to_read, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "read failed with %zd",
num_bytes);
continue;
}
} else if (events[i].events & EPOLLERR) {
ssize_t to_read = 0;
int flags = 0;
num_bytes = do_readerr(t->script_slave, flow->fd, buf,
to_read, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "read error failed with %zd",
num_bytes);
continue;
}
}
}
}
static void server_events(struct thread *t, int epfd,
struct epoll_event *events, int nfds, int fd_listen,
char *buf)
{
struct callbacks *cb = t->cb;
ssize_t num_bytes;
int i;
for (i = 0; i < nfds; i++) {
struct flow *flow = events[i].data.ptr;
if (flow->fd == t->stop_efd) {
t->stop = 1;
break;
}
/* STUB: Accept incoming data connections */
/* STUB: Delete flow on EPOLLRDHUP */
if (events[i].events & EPOLLOUT) {
ssize_t to_write = flow->bytes_to_write;
int flags = 0;
num_bytes = do_write(t->script_slave, flow->fd, buf,
to_write, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "write failed with %zd",
num_bytes);
continue;
}
} else if (events[i].events & EPOLLIN) {
ssize_t to_read = flow->bytes_to_read;
int flags = 0;
num_bytes = do_read(t->script_slave, flow->fd, buf,
to_read, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "read failed with %zd",
num_bytes);
continue;
}
} else if (events[i].events & EPOLLERR) {
ssize_t to_read = 0;
int flags = 0;
num_bytes = do_readerr(t->script_slave, flow->fd, buf,
to_read, flags);
if (num_bytes < 0) {
PLOG_ERROR(cb, "read error failed with %zd",
num_bytes);
continue;
}
}
}
}
static void *worker_thread(void *arg)
{
struct thread *t = arg;
struct options *opts = t->opts;
assert(opts->port);
reset_port(t->ai, atoi(opts->port), t->cb);
if (opts->client)
run_client(t, &fake_socket_ops, client_events);
else
run_server(t, &fake_socket_ops, server_events);
return NULL;
}
static void report_stats(struct thread *tinfo)
{
(void) tinfo;
}
int dummy_test(struct options *opts, struct callbacks *cb)
{
init_fake_events(opts->client);
return run_main_thread(opts, cb, worker_thread, report_stats);
}