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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
// Copyright 2017 Capitar IT Group BV <info@capitar.com>
//
// 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"
// Pull protocol. The PULL protocol is the "read" side of a pipeline.
typedef struct pull_pipe pull_pipe;
typedef struct pull_sock pull_sock;
static void pull_putq_cb(void *);
static void pull_recv_cb(void *);
static void pull_putq(pull_pipe *, nni_msg *);
// A pull_sock is our per-socket protocol private structure.
struct pull_sock {
nni_msgq *urq;
int raw;
nni_sock *sock;
};
// A pull_pipe is our per-pipe protocol private structure.
struct pull_pipe {
nni_pipe * pipe;
pull_sock *pull;
nni_aio * putq_aio;
nni_aio * recv_aio;
};
static int
pull_sock_init(void **sp, nni_sock *sock)
{
pull_sock *s;
if ((s = NNI_ALLOC_STRUCT(s)) == NULL) {
return (NNG_ENOMEM);
}
s->raw = 0;
s->urq = nni_sock_recvq(sock);
s->sock = sock;
*sp = s;
return (0);
}
static void
pull_sock_fini(void *arg)
{
pull_sock *s = arg;
NNI_FREE_STRUCT(s);
}
static void
pull_pipe_fini(void *arg)
{
pull_pipe *p = arg;
nni_aio_fini(p->putq_aio);
nni_aio_fini(p->recv_aio);
NNI_FREE_STRUCT(p);
}
static int
pull_pipe_init(void **pp, nni_pipe *pipe, void *s)
{
pull_pipe *p;
int rv;
if ((p = NNI_ALLOC_STRUCT(p)) == NULL) {
return (NNG_ENOMEM);
}
if (((rv = nni_aio_init(&p->putq_aio, pull_putq_cb, p)) != 0) ||
((rv = nni_aio_init(&p->recv_aio, pull_recv_cb, p)) != 0)) {
pull_pipe_fini(p);
return (rv);
}
p->pipe = pipe;
p->pull = s;
*pp = p;
return (0);
}
static int
pull_pipe_start(void *arg)
{
pull_pipe *p = arg;
// Start the pending pull...
nni_pipe_recv(p->pipe, p->recv_aio);
return (0);
}
static void
pull_pipe_stop(void *arg)
{
pull_pipe *p = arg;
nni_aio_stop(p->putq_aio);
nni_aio_stop(p->recv_aio);
}
static void
pull_recv_cb(void *arg)
{
pull_pipe *p = arg;
nni_aio * aio = p->recv_aio;
nni_msg * msg;
if (nni_aio_result(aio) != 0) {
// Failed to get a message, probably the pipe is closed.
nni_pipe_stop(p->pipe);
return;
}
// Got a message... start the put to send it up to the application.
msg = nni_aio_get_msg(aio);
nni_msg_set_pipe(msg, nni_pipe_id(p->pipe));
nni_aio_set_msg(aio, NULL);
pull_putq(p, msg);
}
static void
pull_putq_cb(void *arg)
{
pull_pipe *p = arg;
nni_aio * aio = p->putq_aio;
if (nni_aio_result(aio) != 0) {
// If we failed to put, probably NNG_ECLOSED, nothing else
// we can do. Just close the pipe.
nni_msg_free(nni_aio_get_msg(aio));
nni_aio_set_msg(aio, NULL);
nni_pipe_stop(p->pipe);
return;
}
nni_pipe_recv(p->pipe, p->recv_aio);
}
// nni_pull_putq schedules a put operation to the user socket (sendup).
static void
pull_putq(pull_pipe *p, nni_msg *msg)
{
pull_sock *s = p->pull;
nni_aio_set_msg(p->putq_aio, msg);
nni_msgq_aio_put(s->urq, p->putq_aio);
}
static void
pull_sock_open(void *arg)
{
NNI_ARG_UNUSED(arg);
}
static void
pull_sock_close(void *arg)
{
NNI_ARG_UNUSED(arg);
}
static int
pull_sock_setopt_raw(void *arg, const void *buf, size_t sz)
{
pull_sock *s = arg;
return (nni_setopt_int(&s->raw, buf, sz, 0, 1));
}
static int
pull_sock_getopt_raw(void *arg, void *buf, size_t *szp)
{
pull_sock *s = arg;
return (nni_getopt_int(s->raw, buf, szp));
}
static void
pull_sock_send(void *arg, nni_aio *aio)
{
nni_aio_finish_error(aio, NNG_ENOTSUP);
}
static void
pull_sock_recv(void *arg, nni_aio *aio)
{
pull_sock *s = arg;
nni_sock_recv_pending(s->sock);
nni_msgq_aio_get(s->urq, aio);
}
static nni_proto_pipe_ops pull_pipe_ops = {
.pipe_init = pull_pipe_init,
.pipe_fini = pull_pipe_fini,
.pipe_start = pull_pipe_start,
.pipe_stop = pull_pipe_stop,
};
static nni_proto_sock_option pull_sock_options[] = {
{
.pso_name = NNG_OPT_RAW,
.pso_getopt = pull_sock_getopt_raw,
.pso_setopt = pull_sock_setopt_raw,
},
// terminate list
{ NULL, NULL, NULL },
};
static nni_proto_sock_ops pull_sock_ops = {
.sock_init = pull_sock_init,
.sock_fini = pull_sock_fini,
.sock_open = pull_sock_open,
.sock_close = pull_sock_close,
.sock_send = pull_sock_send,
.sock_recv = pull_sock_recv,
.sock_options = pull_sock_options,
};
static nni_proto pull_proto = {
.proto_version = NNI_PROTOCOL_VERSION,
.proto_self = { NNG_PROTO_PULL_V0, "pull" },
.proto_peer = { NNG_PROTO_PUSH_V0, "push" },
.proto_flags = NNI_PROTO_FLAG_RCV,
.proto_pipe_ops = &pull_pipe_ops,
.proto_sock_ops = &pull_sock_ops,
};
int
nng_pull0_open(nng_socket *sidp)
{
return (nni_proto_open(sidp, &pull_proto));
}
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