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//
// Copyright 2016 Garrett D'Amore <garrett@damore.org>
//
// 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 <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
// Pair protocol. The PAIR protocol is a simple 1:1 messaging pattern.
// While a peer is connected to the server, all other peer connection
// attempts are discarded.
typedef struct nni_pair_pipe nni_pair_pipe;
typedef struct nni_pair_sock nni_pair_sock;
// An nni_pair_sock is our per-socket protocol private structure.
struct nni_pair_sock {
nni_socket * sock;
nni_pair_pipe * pipe;
nni_mtx mx;
nni_msgqueue * uwq;
nni_msgqueue * urq;
};
// An nni_pair_pipe is our per-pipe protocol private structure. We keep
// one of these even though in theory we'd only have a single underlying
// pipe. The separate data structure is more like other protocols that do
// manage multiple pipes.
struct nni_pair_pipe {
nni_pipe * pipe;
nni_pair_sock * pair;
int sigclose;
};
static void nni_pair_receiver(void *);
static void nni_pair_sender(void *);
static int
nni_pair_create(void **pairp, nni_socket *sock)
{
nni_pair_sock *pair;
int rv;
if ((pair = nni_alloc(sizeof (*pair))) == NULL) {
return (NNG_ENOMEM);
}
if ((rv = nni_mtx_init(&pair->mx)) != 0) {
nni_free(pair, sizeof (*pair));
return (rv);
}
pair->sock = sock;
pair->pipe = NULL;
pair->uwq = nni_socket_sendq(sock);
pair->urq = nni_socket_recvq(sock);
*pairp = pair;
return (0);
}
static void
nni_pair_destroy(void *arg)
{
nni_pair_sock *pair = arg;
// If we had any worker threads that we have not unregistered,
// this wold be the time to shut them all down. We don't, because
// the socket already shut us down, and we don't have any other
// threads that run.
nni_mtx_fini(&pair->mx);
nni_free(pair, sizeof (*pair));
}
static int
nni_pair_add_pipe(void *arg, nni_pipe *pipe, void *data)
{
nni_pair_sock *pair = arg;
nni_pair_pipe *pp = data;
int rv;
pp->pipe = pipe;
pp->sigclose = 0;
pp->pair = pair;
nni_mtx_lock(&pair->mx);
if (pair->pipe != NULL) {
nni_mtx_unlock(&pair->mx);
return (NNG_EBUSY); // Already have a peer, denied.
}
pair->pipe = pp;
nni_mtx_unlock(&pair->mx);
return (0);
}
static void
nni_pair_rem_pipe(void *arg, void *data)
{
nni_pair_sock *pair = arg;
nni_pair_pipe *pp = data;
nni_mtx_lock(&pair->mx);
if (pair->pipe == pp) {
pair->pipe = NULL;
}
nni_mtx_unlock(&pair->mx);
}
static void
nni_pair_sender(void *arg)
{
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
nni_msgqueue *uwq = pair->uwq;
nni_msgqueue *urq = pair->urq;
nni_pipe *pipe = pp->pipe;
nni_msg *msg;
int rv;
for (;;) {
rv = nni_msgqueue_get_sig(uwq, &msg, &pp->sigclose);
if (rv != 0) {
break;
}
rv = nni_pipe_send(pipe, msg);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(urq, &pp->sigclose);
nni_pipe_close(pipe);
}
static void
nni_pair_receiver(void *arg)
{
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
nni_msgqueue *urq = pair->urq;
nni_msgqueue *uwq = pair->uwq;
nni_pipe *pipe = pp->pipe;
nni_msg *msg;
int rv;
for (;;) {
rv = nni_pipe_recv(pipe, &msg);
if (rv != 0) {
break;
}
rv = nni_msgqueue_put_sig(urq, msg, &pp->sigclose);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(uwq, &pp->sigclose);
nni_pipe_close(pipe);
}
// TODO: probably we could replace these with NULL, since we have no
// protocol specific options?
static int
nni_pair_setopt(void *arg, int opt, const void *buf, size_t sz)
{
return (NNG_ENOTSUP);
}
static int
nni_pair_getopt(void *arg, int opt, void *buf, size_t *szp)
{
return (NNG_ENOTSUP);
}
// This is the global protocol structure -- our linkage to the core.
// This should be the only global non-static symbol in this file.
struct nni_protocol nni_pair_protocol = {
.proto_self = NNG_PROTO_PAIR,
.proto_peer = NNG_PROTO_PAIR,
.proto_name = "pair",
.proto_create = nni_pair_create,
.proto_destroy = nni_pair_destroy,
.proto_add_pipe = nni_pair_add_pipe,
.proto_rem_pipe = nni_pair_rem_pipe,
.proto_pipe_size = sizeof (nni_pair_pipe),
.proto_pipe_send = nni_pair_sender,
.proto_pipe_recv = nni_pair_receiver,
.proto_setopt = nni_pair_setopt,
.proto_getopt = nni_pair_getopt,
.proto_recv_filter = NULL,
.proto_send_filter = NULL,
};
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