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//
// Copyright 2017 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"
// Push protocol. The PUSH protocol is the "write" side of a pipeline.
// Push distributes fairly, or tries to, by giving messages in round-robin
// order.
typedef struct nni_push_pipe nni_push_pipe;
typedef struct nni_push_sock nni_push_sock;
static void nni_push_send_cb(void *);
static void nni_push_recv_cb(void *);
static void nni_push_getq_cb(void *);
// An nni_push_sock is our per-socket protocol private structure.
struct nni_push_sock {
nni_msgq *uwq;
int raw;
nni_sock *sock;
};
// An nni_push_pipe is our per-pipe protocol private structure.
struct nni_push_pipe {
nni_pipe * pipe;
nni_push_sock *push;
nni_list_node node;
nni_aio aio_recv;
nni_aio aio_send;
nni_aio aio_getq;
};
static int
nni_push_sock_init(void **pushp, nni_sock *sock)
{
nni_push_sock *push;
if ((push = NNI_ALLOC_STRUCT(push)) == NULL) {
return (NNG_ENOMEM);
}
push->raw = 0;
push->sock = sock;
push->uwq = nni_sock_sendq(sock);
*pushp = push;
nni_sock_recverr(sock, NNG_ENOTSUP);
return (0);
}
static void
nni_push_sock_fini(void *arg)
{
nni_push_sock *push = arg;
if (push != NULL) {
NNI_FREE_STRUCT(push);
}
}
static void
nni_push_pipe_fini(void *arg)
{
nni_push_pipe *pp = arg;
nni_aio_fini(&pp->aio_recv);
nni_aio_fini(&pp->aio_send);
nni_aio_fini(&pp->aio_getq);
NNI_FREE_STRUCT(pp);
}
static int
nni_push_pipe_init(void **ppp, nni_pipe *pipe, void *psock)
{
nni_push_pipe *pp;
int rv;
if ((pp = NNI_ALLOC_STRUCT(pp)) == NULL) {
return (NNG_ENOMEM);
}
if ((rv = nni_aio_init(&pp->aio_recv, nni_push_recv_cb, pp)) != 0) {
goto fail;
}
if ((rv = nni_aio_init(&pp->aio_send, nni_push_send_cb, pp)) != 0) {
goto fail;
}
if ((rv = nni_aio_init(&pp->aio_getq, nni_push_getq_cb, pp)) != 0) {
goto fail;
}
NNI_LIST_NODE_INIT(&pp->node);
pp->pipe = pipe;
pp->push = psock;
*ppp = pp;
return (0);
fail:
nni_push_pipe_fini(pp);
return (rv);
}
static int
nni_push_pipe_start(void *arg)
{
nni_push_pipe *pp = arg;
nni_push_sock *push = pp->push;
if (nni_pipe_peer(pp->pipe) != NNG_PROTO_PULL) {
return (NNG_EPROTO);
}
// Schedule a receiver. This is mostly so that we can detect
// a closed transport pipe.
nni_pipe_recv(pp->pipe, &pp->aio_recv);
// Schedule a sender.
nni_msgq_aio_get(push->uwq, &pp->aio_getq);
return (0);
}
static void
nni_push_pipe_stop(void *arg)
{
nni_push_pipe *pp = arg;
nni_push_sock *push = pp->push;
nni_aio_stop(&pp->aio_recv);
nni_aio_stop(&pp->aio_send);
nni_aio_stop(&pp->aio_getq);
}
static void
nni_push_recv_cb(void *arg)
{
nni_push_pipe *pp = arg;
// We normally expect to receive an error. If a pipe actually
// sends us data, we just discard it.
if (nni_aio_result(&pp->aio_recv) != 0) {
nni_pipe_stop(pp->pipe);
return;
}
nni_msg_free(pp->aio_recv.a_msg);
pp->aio_recv.a_msg = NULL;
nni_pipe_recv(pp->pipe, &pp->aio_recv);
}
static void
nni_push_send_cb(void *arg)
{
nni_push_pipe *pp = arg;
nni_push_sock *push = pp->push;
if (nni_aio_result(&pp->aio_send) != 0) {
nni_msg_free(pp->aio_send.a_msg);
pp->aio_send.a_msg = NULL;
nni_pipe_stop(pp->pipe);
return;
}
nni_msgq_aio_get(push->uwq, &pp->aio_getq);
}
static void
nni_push_getq_cb(void *arg)
{
nni_push_pipe *pp = arg;
nni_aio * aio = &pp->aio_getq;
if (nni_aio_result(aio) != 0) {
// If the socket is closing, nothing else we can do.
nni_pipe_stop(pp->pipe);
return;
}
pp->aio_send.a_msg = aio->a_msg;
aio->a_msg = NULL;
nni_pipe_send(pp->pipe, &pp->aio_send);
}
static int
nni_push_sock_setopt(void *arg, int opt, const void *buf, size_t sz)
{
nni_push_sock *push = arg;
int rv;
switch (opt) {
case NNG_OPT_RAW:
rv = nni_setopt_int(&push->raw, buf, sz, 0, 1);
break;
default:
rv = NNG_ENOTSUP;
}
return (rv);
}
static int
nni_push_sock_getopt(void *arg, int opt, void *buf, size_t *szp)
{
nni_push_sock *push = arg;
int rv;
switch (opt) {
case NNG_OPT_RAW:
rv = nni_getopt_int(&push->raw, buf, szp);
break;
default:
rv = NNG_ENOTSUP;
}
return (rv);
}
// This is the global protocol structure -- our linkage to the core.
// This should be the only global non-static symbol in this file.
static nni_proto_pipe_ops nni_push_pipe_ops = {
.pipe_init = nni_push_pipe_init,
.pipe_fini = nni_push_pipe_fini,
.pipe_start = nni_push_pipe_start,
.pipe_stop = nni_push_pipe_stop,
};
static nni_proto_sock_ops nni_push_sock_ops = {
.sock_init = nni_push_sock_init,
.sock_fini = nni_push_sock_fini,
.sock_setopt = nni_push_sock_setopt,
.sock_getopt = nni_push_sock_getopt,
};
nni_proto nni_push_proto = {
.proto_self = NNG_PROTO_PUSH,
.proto_peer = NNG_PROTO_PULL,
.proto_name = "push",
.proto_flags = NNI_PROTO_FLAG_SND,
.proto_pipe_ops = &nni_push_pipe_ops,
.proto_sock_ops = &nni_push_sock_ops,
};
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