litespeed-quic/test/echo_client.c

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/* Copyright (c) 2017 - 2019 LiteSpeed Technologies Inc. See LICENSE. */
/*
* echo_client.c -- This is really a "line client:" it connects to QUIC server
* and sends it stuff, line by line. It works in tandem with echo_server.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <event2/event.h>
#include "lsquic.h"
#include "test_common.h"
#include "prog.h"
#include "../src/liblsquic/lsquic_logger.h"
struct lsquic_conn_ctx;
struct echo_client_ctx {
struct lsquic_conn_ctx *conn_h;
struct prog *prog;
};
struct lsquic_conn_ctx {
lsquic_conn_t *conn;
struct echo_client_ctx *client_ctx;
};
static lsquic_conn_ctx_t *
echo_client_on_new_conn (void *stream_if_ctx, lsquic_conn_t *conn)
{
struct echo_client_ctx *client_ctx = stream_if_ctx;
lsquic_conn_ctx_t *conn_h = malloc(sizeof(*conn_h));
conn_h->conn = conn;
conn_h->client_ctx = client_ctx;
client_ctx->conn_h = conn_h;
lsquic_conn_make_stream(conn);
return conn_h;
}
static void
echo_client_on_conn_closed (lsquic_conn_t *conn)
{
lsquic_conn_ctx_t *conn_h = lsquic_conn_get_ctx(conn);
LSQ_NOTICE("Connection closed");
prog_stop(conn_h->client_ctx->prog);
free(conn_h);
}
struct lsquic_stream_ctx {
lsquic_stream_t *stream;
struct echo_client_ctx *client_ctx;
struct event *read_stdin_ev;
char buf[0x100];
size_t buf_off;
};
static void
read_stdin (int fd, short what, void *ctx)
{
ssize_t nr;
lsquic_stream_ctx_t *st_h = ctx;
nr = read(fd, st_h->buf + st_h->buf_off++, 1);
LSQ_DEBUG("read %zd bytes from stdin", nr);
if (0 == nr)
{
lsquic_stream_shutdown(st_h->stream, 2);
}
else if (-1 == nr)
{
perror("read");
exit(1);
}
else if ('\n' == st_h->buf[ st_h->buf_off - 1 ])
{
LSQ_DEBUG("read newline: wantwrite");
lsquic_stream_wantwrite(st_h->stream, 1);
lsquic_engine_process_conns(st_h->client_ctx->prog->prog_engine);
}
else if (st_h->buf_off == sizeof(st_h->buf))
{
LSQ_NOTICE("line too long");
exit(2);
}
else
event_add(st_h->read_stdin_ev, NULL);
}
static lsquic_stream_ctx_t *
echo_client_on_new_stream (void *stream_if_ctx, lsquic_stream_t *stream)
{
lsquic_stream_ctx_t *st_h = calloc(1, sizeof(*st_h));
st_h->stream = stream;
st_h->client_ctx = stream_if_ctx;
st_h->buf_off = 0;
st_h->read_stdin_ev = event_new(prog_eb(st_h->client_ctx->prog),
STDIN_FILENO, EV_READ, read_stdin, st_h);
event_add(st_h->read_stdin_ev, NULL);
return st_h;
}
static void
echo_client_on_read (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
char c;
size_t nr;
nr = lsquic_stream_read(stream, &c, 1);
if (0 == nr)
{
lsquic_stream_shutdown(stream, 2);
return;
}
printf("%c", c);
fflush(stdout);
if ('\n' == c)
{
event_add(st_h->read_stdin_ev, NULL);
lsquic_stream_wantread(stream, 0);
}
}
static void
echo_client_on_write (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
/* Here we make an assumption that we can write the whole buffer.
* Don't do it in a real program.
*/
lsquic_stream_write(stream, st_h->buf, st_h->buf_off);
st_h->buf_off = 0;
lsquic_stream_flush(stream);
lsquic_stream_wantwrite(stream, 0);
lsquic_stream_wantread(stream, 1);
}
static void
echo_client_on_close (lsquic_stream_t *stream, lsquic_stream_ctx_t *st_h)
{
LSQ_NOTICE("%s called", __func__);
if (st_h->read_stdin_ev)
{
event_del(st_h->read_stdin_ev);
event_free(st_h->read_stdin_ev);
}
free(st_h);
lsquic_conn_close(lsquic_stream_conn(stream));
}
const struct lsquic_stream_if client_echo_stream_if = {
.on_new_conn = echo_client_on_new_conn,
.on_conn_closed = echo_client_on_conn_closed,
.on_new_stream = echo_client_on_new_stream,
.on_read = echo_client_on_read,
.on_write = echo_client_on_write,
.on_close = echo_client_on_close,
};
static void
usage (const char *prog)
{
const char *const slash = strrchr(prog, '/');
if (slash)
prog = slash + 1;
LSQ_NOTICE(
"Usage: %s [opts]\n"
"\n"
"Options:\n"
, prog);
}
int
main (int argc, char **argv)
{
int opt, s;
struct sport_head sports;
struct prog prog;
struct echo_client_ctx client_ctx;
memset(&client_ctx, 0, sizeof(client_ctx));
client_ctx.prog = &prog;
TAILQ_INIT(&sports);
prog_init(&prog, 0, &sports, &client_echo_stream_if, &client_ctx);
while (-1 != (opt = getopt(argc, argv, PROG_OPTS "h")))
{
switch (opt) {
case 'h':
usage(argv[0]);
prog_print_common_options(&prog, stdout);
exit(0);
default:
if (0 != prog_set_opt(&prog, opt, optarg))
exit(1);
}
}
int flags = fcntl(STDIN_FILENO, F_GETFL);
flags |= O_NONBLOCK;
if (0 != fcntl(STDIN_FILENO, F_SETFL, flags))
{
perror("fcntl");
exit(1);
}
if (0 != prog_prep(&prog))
{
LSQ_ERROR("could not prep");
exit(EXIT_FAILURE);
}
if (0 != prog_connect(&prog, NULL, 0))
{
LSQ_ERROR("could not connect");
exit(EXIT_FAILURE);
}
LSQ_DEBUG("entering event loop");
s = prog_run(&prog);
prog_cleanup(&prog);
exit(0 == s ? EXIT_SUCCESS : EXIT_FAILURE);
}