//
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// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#include <stdlib.h>
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#include "core/nng_impl.h"
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#include "nng/protocol/pubsub0/sub.h"
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// Subscriber protocol. The SUB protocol receives messages sent to
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// it from publishers, and filters out those it is not interested in,
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// only passing up ones that match known subscriptions.
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#ifndef NNI_PROTO_SUB_V0
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#define NNI_PROTO_SUB_V0 NNI_PROTO(2, 1)
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#endif
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#ifndef NNI_PROTO_PUB_V0
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#define NNI_PROTO_PUB_V0 NNI_PROTO(2, 0)
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#endif
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typedef struct xsub0_pipe xsub0_pipe;
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typedef struct xsub0_sock xsub0_sock;
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static void xsub0_recv_cb(void *);
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static void xsub0_pipe_fini(void *);
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// xsub0_sock is our per-socket protocol private structure.
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struct xsub0_sock {
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nni_msgq *urq;
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nni_mtx lk;
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};
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// sub0_pipe is our per-pipe protocol private structure.
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struct xsub0_pipe {
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nni_pipe * pipe;
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xsub0_sock *sub;
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nni_aio aio_recv;
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};
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static int
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xsub0_sock_init(void *arg, nni_sock *sock)
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{
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xsub0_sock *s = arg;
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s->urq = nni_sock_recvq(sock);
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return (0);
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}
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static void
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xsub0_sock_fini(void *arg)
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{
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xsub0_sock *s = arg;
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nni_mtx_fini(&s->lk);
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}
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static void
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xsub0_sock_open(void *arg)
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{
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NNI_ARG_UNUSED(arg);
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}
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static void
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xsub0_sock_close(void *arg)
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{
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NNI_ARG_UNUSED(arg);
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}
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static void
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xsub0_pipe_stop(void *arg)
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{
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xsub0_pipe *p = arg;
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nni_aio_stop(&p->aio_recv);
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}
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static void
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xsub0_pipe_fini(void *arg)
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{
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xsub0_pipe *p = arg;
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nni_aio_fini(&p->aio_recv);
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}
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static int
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xsub0_pipe_init(void *arg, nni_pipe *pipe, void *s)
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{
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xsub0_pipe *p = arg;
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nni_aio_init(&p->aio_recv, xsub0_recv_cb, p);
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p->pipe = pipe;
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p->sub = s;
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return (0);
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}
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static int
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xsub0_pipe_start(void *arg)
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{
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xsub0_pipe *p = arg;
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if (nni_pipe_peer(p->pipe) != NNI_PROTO_PUB_V0) {
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// Peer protocol mismatch.
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return (NNG_EPROTO);
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}
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nni_pipe_recv(p->pipe, &p->aio_recv);
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return (0);
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}
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static void
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xsub0_pipe_close(void *arg)
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{
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xsub0_pipe *p = arg;
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nni_aio_close(&p->aio_recv);
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}
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static void
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xsub0_recv_cb(void *arg)
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{
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xsub0_pipe *p = arg;
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xsub0_sock *s = p->sub;
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nni_msgq * urq = s->urq;
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nni_msg * msg;
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if (nni_aio_result(&p->aio_recv) != 0) {
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nni_pipe_close(p->pipe);
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return;
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}
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msg = nni_aio_get_msg(&p->aio_recv);
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nni_aio_set_msg(&p->aio_recv, NULL);
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nni_msg_set_pipe(msg, nni_pipe_id(p->pipe));
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if (nni_msgq_tryput(urq, msg) != 0) {
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// This only happens for two reasons. For flow control,
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// in which case we just want to discard the message and
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// carry on, and for a close of the socket (which is very
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// hard to achieve, since we close the pipes.) In either
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// case the easiest thing to do is just free the message
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// and try again.
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nni_msg_free(msg);
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}
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nni_pipe_recv(p->pipe, &p->aio_recv);
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}
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static void
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xsub0_sock_send(void *arg, nni_aio *aio)
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{
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NNI_ARG_UNUSED(arg);
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nni_aio_finish_error(aio, NNG_ENOTSUP);
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}
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static void
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xsub0_sock_recv(void *arg, nni_aio *aio)
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{
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xsub0_sock *s = arg;
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nni_msgq_aio_get(s->urq, aio);
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}
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// This is the global protocol structure -- our linkage to the core.
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// This should be the only global non-static symbol in this file.
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static nni_proto_pipe_ops xsub0_pipe_ops = {
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.pipe_size = sizeof(xsub0_pipe),
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.pipe_init = xsub0_pipe_init,
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.pipe_fini = xsub0_pipe_fini,
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.pipe_start = xsub0_pipe_start,
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.pipe_close = xsub0_pipe_close,
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.pipe_stop = xsub0_pipe_stop,
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};
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static nni_option xsub0_sock_options[] = {
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// terminate list
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{
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.o_name = NULL,
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},
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};
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static nni_proto_sock_ops xsub0_sock_ops = {
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.sock_size = sizeof(xsub0_sock),
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.sock_init = xsub0_sock_init,
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.sock_fini = xsub0_sock_fini,
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.sock_open = xsub0_sock_open,
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.sock_close = xsub0_sock_close,
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.sock_send = xsub0_sock_send,
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.sock_recv = xsub0_sock_recv,
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.sock_options = xsub0_sock_options,
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};
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static nni_proto xsub0_proto = {
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.proto_version = NNI_PROTOCOL_VERSION,
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.proto_self = { NNI_PROTO_SUB_V0, "sub" },
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.proto_peer = { NNI_PROTO_PUB_V0, "pub" },
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.proto_flags = NNI_PROTO_FLAG_RCV | NNI_PROTO_FLAG_RAW,
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.proto_sock_ops = &xsub0_sock_ops,
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.proto_pipe_ops = &xsub0_pipe_ops,
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};
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int
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nng_sub0_open_raw(nng_socket *sidp)
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{
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return (nni_proto_open(sidp, &xsub0_proto));
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}
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