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//
// Copyright 2023 Staysail Systems, Inc. <info@staysail.tech>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include <stdint.h>
#include <string.h>
#include <nng/nng.h>
#include "core/nng_impl.h"
#include "core/sockfd.h"
// We will accept up to this many FDs to be queued up for
// accept, before we start rejecting with NNG_ENOSPC. Once
// accept is performed, then another slot is available.
#define NNG_SFD_LISTEN_QUEUE 16
int
nni_sfd_dialer_alloc(nng_stream_dialer **dp, const nng_url *url)
{
NNI_ARG_UNUSED(dp);
NNI_ARG_UNUSED(url);
// No dialer support for this.
return (NNG_ENOTSUP);
}
typedef struct {
nng_stream_listener ops;
int listen_cnt; // how many FDs are waiting
int listen_q[NNG_SFD_LISTEN_QUEUE];
bool closed;
nni_list accept_q;
nni_mtx mtx;
} sfd_listener;
static void
sfd_listener_free(void *arg)
{
sfd_listener *l = arg;
nni_mtx_fini(&l->mtx);
NNI_FREE_STRUCT(l);
}
static void
sfd_listener_close(void *arg)
{
nni_aio *aio;
sfd_listener *l = arg;
nni_mtx_lock(&l->mtx);
l->closed = true;
while ((aio = nni_list_first(&l->accept_q)) != NULL) {
nni_aio_list_remove(aio);
nni_aio_finish_error(aio, NNG_ECLOSED);
}
for (int i = 0; i < l->listen_cnt; i++) {
nni_sfd_close_fd(l->listen_q[i]);
}
nni_mtx_unlock(&l->mtx);
}
static int
sfd_listener_listen(void *arg)
{
NNI_ARG_UNUSED(arg);
// nothing really for us to do
return (0);
}
static void
sfd_start_conn(sfd_listener *l, nni_aio *aio)
{
int fd;
int rv;
nni_sfd_conn *c;
NNI_ASSERT(l->listen_cnt > 0);
fd = l->listen_q[0];
for (int i = 1; i < l->listen_cnt; i++) {
l->listen_q[i] = l->listen_q[i + 1];
}
l->listen_cnt--;
if ((rv = nni_sfd_conn_alloc(&c, fd)) != 0) {
nni_aio_finish_error(aio, rv);
nni_sfd_close_fd(fd);
} else {
nni_aio_set_output(aio, 0, c);
nni_aio_finish(aio, 0, 0);
}
}
static void
sfd_cancel_accept(nni_aio *aio, void *arg, int rv)
{
sfd_listener *l = arg;
nni_mtx_lock(&l->mtx);
if (nni_aio_list_active(aio)) {
nni_aio_list_remove(aio);
nni_aio_finish_error(aio, rv);
}
nni_mtx_unlock(&l->mtx);
}
static void
sfd_listener_accept(void *arg, nng_aio *aio)
{
sfd_listener *l = arg;
int rv;
if (nni_aio_begin(aio) != 0) {
return;
}
nni_mtx_lock(&l->mtx);
if (l->closed) {
nni_mtx_unlock(&l->mtx);
nni_aio_finish_error(aio, NNG_ECLOSED);
return;
}
if (l->listen_cnt) {
sfd_start_conn(l, aio);
} else if ((rv = nni_aio_schedule(aio, sfd_cancel_accept, l)) != 0) {
nni_aio_finish_error(aio, rv);
} else {
nni_aio_list_append(&l->accept_q, aio);
}
nni_mtx_unlock(&l->mtx);
}
static int
sfd_listener_set_fd(void *arg, const void *buf, size_t sz, nni_type t)
{
sfd_listener *l = arg;
nni_aio *aio;
int fd;
int rv;
if ((rv = nni_copyin_int(&fd, buf, sz, 0, NNI_MAXINT, t)) != 0) {
return (rv);
}
nni_mtx_lock(&l->mtx);
if (l->closed) {
nni_mtx_unlock(&l->mtx);
return (NNG_ECLOSED);
}
if (l->listen_cnt == NNG_SFD_LISTEN_QUEUE) {
nni_mtx_unlock(&l->mtx);
return (NNG_ENOSPC);
}
l->listen_q[l->listen_cnt++] = fd;
// if someone was waiting in accept, give it to them now
if ((aio = nni_list_first(&l->accept_q)) != NULL) {
nni_aio_list_remove(aio);
sfd_start_conn(l, aio);
}
nni_mtx_unlock(&l->mtx);
return (0);
}
static int
sfd_listener_get_addr(void *arg, void *buf, size_t *szp, nni_type t)
{
NNI_ARG_UNUSED(arg);
nng_sockaddr sa;
sa.s_family = NNG_AF_UNSPEC;
return (nni_copyout_sockaddr(&sa, buf, szp, t));
}
static const nni_option sfd_listener_options[] = {
{
.o_name = NNG_OPT_SOCKET_FD,
.o_set = sfd_listener_set_fd,
},
{
.o_name = NNG_OPT_LOCADDR,
.o_get = sfd_listener_get_addr,
},
{
.o_name = NULL,
},
};
static int
sfd_listener_get(
void *arg, const char *name, void *buf, size_t *szp, nni_type t)
{
sfd_listener *l = arg;
return (nni_getopt(sfd_listener_options, name, l, buf, szp, t));
}
static int
sfd_listener_set(
void *arg, const char *name, const void *buf, size_t sz, nni_type t)
{
sfd_listener *l = arg;
return (nni_setopt(sfd_listener_options, name, l, buf, sz, t));
}
int
nni_sfd_listener_alloc(nng_stream_listener **lp, const nng_url *url)
{
sfd_listener *l;
NNI_ARG_UNUSED(url);
if ((l = NNI_ALLOC_STRUCT(l)) == NULL) {
return (NNG_ENOMEM);
}
memset(l->listen_q, 0, sizeof(l->listen_q));
l->listen_cnt = 0;
nni_aio_list_init(&l->accept_q);
nni_mtx_init(&l->mtx);
l->ops.sl_free = sfd_listener_free;
l->ops.sl_close = sfd_listener_close;
l->ops.sl_listen = sfd_listener_listen;
l->ops.sl_accept = sfd_listener_accept;
l->ops.sl_get = sfd_listener_get;
l->ops.sl_set = sfd_listener_set;
*lp = (void *) l;
return (0);
}
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