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-rw-r--r--src/protocol/bus0/CMakeLists.txt18
-rw-r--r--src/protocol/bus0/bus.c406
-rw-r--r--src/protocol/bus0/bus.h28
3 files changed, 452 insertions, 0 deletions
diff --git a/src/protocol/bus0/CMakeLists.txt b/src/protocol/bus0/CMakeLists.txt
new file mode 100644
index 00000000..5071054a
--- /dev/null
+++ b/src/protocol/bus0/CMakeLists.txt
@@ -0,0 +1,18 @@
+#
+# 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.
+#
+
+# Bus protocol
+
+if (NNG_PROTO_BUS0)
+ set(BUS0_SOURCES protocol/bus0/bus.c protocol/bus0/bus.h)
+ install(FILES bus.h DESTINATION include/nng/protocol/bus0)
+endif()
+
+set(NNG_SOURCES ${NNG_SOURCES} ${BUS0_SOURCES} PARENT_SCOPE)
diff --git a/src/protocol/bus0/bus.c b/src/protocol/bus0/bus.c
new file mode 100644
index 00000000..3e15000b
--- /dev/null
+++ b/src/protocol/bus0/bus.c
@@ -0,0 +1,406 @@
+//
+// 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"
+#include "protocol/bus0/bus.h"
+
+// Bus protocol. The BUS protocol, each peer sends a message to its peers.
+// However, bus protocols do not "forward" (absent a device). So in order
+// for each participant to receive the message, each sender must be connected
+// to every other node in the network (full mesh).
+
+#ifndef NNI_PROTO_BUS_V0
+#define NNI_PROTO_BUS_V0 NNI_PROTO(7, 0)
+#endif
+
+typedef struct bus0_pipe bus0_pipe;
+typedef struct bus0_sock bus0_sock;
+
+static void bus0_sock_getq(bus0_sock *);
+static void bus0_sock_send(void *, nni_aio *);
+static void bus0_sock_recv(void *, nni_aio *);
+
+static void bus0_pipe_getq(bus0_pipe *);
+static void bus0_pipe_send(bus0_pipe *);
+static void bus0_pipe_recv(bus0_pipe *);
+
+static void bus0_sock_getq_cb(void *);
+static void bus0_pipe_getq_cb(void *);
+static void bus0_pipe_send_cb(void *);
+static void bus0_pipe_recv_cb(void *);
+static void bus0_pipe_putq_cb(void *);
+
+// bus0_sock is our per-socket protocol private structure.
+struct bus0_sock {
+ int raw;
+ nni_aio * aio_getq;
+ nni_list pipes;
+ nni_mtx mtx;
+ nni_msgq *uwq;
+ nni_msgq *urq;
+};
+
+// bus0_pipe is our per-pipe protocol private structure.
+struct bus0_pipe {
+ nni_pipe * npipe;
+ bus0_sock * psock;
+ nni_msgq * sendq;
+ nni_list_node node;
+ nni_aio * aio_getq;
+ nni_aio * aio_recv;
+ nni_aio * aio_send;
+ nni_aio * aio_putq;
+ nni_mtx mtx;
+};
+
+static void
+bus0_sock_fini(void *arg)
+{
+ bus0_sock *s = arg;
+
+ nni_aio_stop(s->aio_getq);
+ nni_aio_fini(s->aio_getq);
+ nni_mtx_fini(&s->mtx);
+ NNI_FREE_STRUCT(s);
+}
+
+static int
+bus0_sock_init(void **sp, nni_sock *nsock)
+{
+ bus0_sock *s;
+ int rv;
+
+ if ((s = NNI_ALLOC_STRUCT(s)) == NULL) {
+ return (NNG_ENOMEM);
+ }
+ NNI_LIST_INIT(&s->pipes, bus0_pipe, node);
+ nni_mtx_init(&s->mtx);
+ if ((rv = nni_aio_init(&s->aio_getq, bus0_sock_getq_cb, s)) != 0) {
+ bus0_sock_fini(s);
+ return (rv);
+ }
+ s->raw = 0;
+ s->uwq = nni_sock_sendq(nsock);
+ s->urq = nni_sock_recvq(nsock);
+
+ *sp = s;
+ return (0);
+}
+
+static void
+bus0_sock_open(void *arg)
+{
+ bus0_sock *s = arg;
+
+ bus0_sock_getq(s);
+}
+
+static void
+bus0_sock_close(void *arg)
+{
+ bus0_sock *s = arg;
+
+ nni_aio_cancel(s->aio_getq, NNG_ECLOSED);
+}
+
+static void
+bus0_pipe_fini(void *arg)
+{
+ bus0_pipe *p = arg;
+
+ nni_aio_fini(p->aio_getq);
+ nni_aio_fini(p->aio_send);
+ nni_aio_fini(p->aio_recv);
+ nni_aio_fini(p->aio_putq);
+ nni_msgq_fini(p->sendq);
+ nni_mtx_fini(&p->mtx);
+ NNI_FREE_STRUCT(p);
+}
+
+static int
+bus0_pipe_init(void **pp, nni_pipe *npipe, void *s)
+{
+ bus0_pipe *p;
+ int rv;
+
+ if ((p = NNI_ALLOC_STRUCT(p)) == NULL) {
+ return (NNG_ENOMEM);
+ }
+ NNI_LIST_NODE_INIT(&p->node);
+ nni_mtx_init(&p->mtx);
+ if (((rv = nni_msgq_init(&p->sendq, 16)) != 0) ||
+ ((rv = nni_aio_init(&p->aio_getq, bus0_pipe_getq_cb, p)) != 0) ||
+ ((rv = nni_aio_init(&p->aio_send, bus0_pipe_send_cb, p)) != 0) ||
+ ((rv = nni_aio_init(&p->aio_recv, bus0_pipe_recv_cb, p)) != 0) ||
+ ((rv = nni_aio_init(&p->aio_putq, bus0_pipe_putq_cb, p)) != 0)) {
+ bus0_pipe_fini(p);
+ return (rv);
+ }
+
+ p->npipe = npipe;
+ p->psock = s;
+ *pp = p;
+ return (0);
+}
+
+static int
+bus0_pipe_start(void *arg)
+{
+ bus0_pipe *p = arg;
+ bus0_sock *s = p->psock;
+
+ nni_mtx_lock(&s->mtx);
+ nni_list_append(&s->pipes, p);
+ nni_mtx_unlock(&s->mtx);
+
+ bus0_pipe_recv(p);
+ bus0_pipe_getq(p);
+
+ return (0);
+}
+
+static void
+bus0_pipe_stop(void *arg)
+{
+ bus0_pipe *p = arg;
+ bus0_sock *s = p->psock;
+
+ nni_msgq_close(p->sendq);
+
+ nni_aio_stop(p->aio_getq);
+ nni_aio_stop(p->aio_send);
+ nni_aio_stop(p->aio_recv);
+ nni_aio_stop(p->aio_putq);
+
+ nni_mtx_lock(&s->mtx);
+ if (nni_list_active(&s->pipes, p)) {
+ nni_list_remove(&s->pipes, p);
+ }
+ nni_mtx_unlock(&s->mtx);
+}
+
+static void
+bus0_pipe_getq_cb(void *arg)
+{
+ bus0_pipe *p = arg;
+
+ if (nni_aio_result(p->aio_getq) != 0) {
+ // closed?
+ nni_pipe_stop(p->npipe);
+ return;
+ }
+ nni_aio_set_msg(p->aio_send, nni_aio_get_msg(p->aio_getq));
+ nni_aio_set_msg(p->aio_getq, NULL);
+
+ nni_pipe_send(p->npipe, p->aio_send);
+}
+
+static void
+bus0_pipe_send_cb(void *arg)
+{
+ bus0_pipe *p = arg;
+
+ if (nni_aio_result(p->aio_send) != 0) {
+ // closed?
+ nni_msg_free(nni_aio_get_msg(p->aio_send));
+ nni_aio_set_msg(p->aio_send, NULL);
+ nni_pipe_stop(p->npipe);
+ return;
+ }
+
+ bus0_pipe_getq(p);
+}
+
+static void
+bus0_pipe_recv_cb(void *arg)
+{
+ bus0_pipe *p = arg;
+ bus0_sock *s = p->psock;
+ nni_msg * msg;
+
+ if (nni_aio_result(p->aio_recv) != 0) {
+ nni_pipe_stop(p->npipe);
+ return;
+ }
+ msg = nni_aio_get_msg(p->aio_recv);
+
+ if (nni_msg_header_insert_u32(msg, nni_pipe_id(p->npipe)) != 0) {
+ // XXX: bump a nomemory stat
+ nni_msg_free(msg);
+ nni_aio_set_msg(p->aio_recv, NULL);
+ nni_pipe_stop(p->npipe);
+ return;
+ }
+
+ nni_aio_set_msg(p->aio_putq, msg);
+ nni_aio_set_msg(p->aio_recv, NULL);
+ nni_msgq_aio_put(s->urq, p->aio_putq);
+}
+
+static void
+bus0_pipe_putq_cb(void *arg)
+{
+ bus0_pipe *p = arg;
+
+ if (nni_aio_result(p->aio_putq) != 0) {
+ nni_msg_free(nni_aio_get_msg(p->aio_putq));
+ nni_aio_set_msg(p->aio_putq, NULL);
+ nni_pipe_stop(p->npipe);
+ return;
+ }
+
+ // Wait for another recv.
+ bus0_pipe_recv(p);
+}
+
+static void
+bus0_sock_getq_cb(void *arg)
+{
+ bus0_sock *s = arg;
+ bus0_pipe *p;
+ bus0_pipe *lastp;
+ nni_msg * msg;
+ nni_msg * dup;
+ uint32_t sender;
+
+ if (nni_aio_result(s->aio_getq) != 0) {
+ return;
+ }
+
+ msg = nni_aio_get_msg(s->aio_getq);
+
+ // The header being present indicates that the message
+ // was received locally and we are rebroadcasting. (Device
+ // is doing this probably.) In this case grab the pipe
+ // ID from the header, so we can exclude it.
+ if (nni_msg_header_len(msg) >= 4) {
+ sender = nni_msg_header_trim_u32(msg);
+ } else {
+ sender = 0;
+ }
+
+ nni_mtx_lock(&s->mtx);
+ lastp = nni_list_last(&s->pipes);
+ NNI_LIST_FOREACH (&s->pipes, p) {
+ if (nni_pipe_id(p->npipe) == sender) {
+ continue;
+ }
+ if (p != lastp) {
+ if (nni_msg_dup(&dup, msg) != 0) {
+ continue;
+ }
+ } else {
+ dup = msg;
+ }
+ if (nni_msgq_tryput(p->sendq, dup) != 0) {
+ nni_msg_free(dup);
+ }
+ }
+ nni_mtx_unlock(&s->mtx);
+
+ if (lastp == NULL) {
+ nni_msg_free(msg);
+ }
+
+ bus0_sock_getq(s);
+}
+
+static void
+bus0_sock_getq(bus0_sock *s)
+{
+ nni_msgq_aio_get(s->uwq, s->aio_getq);
+}
+
+static void
+bus0_pipe_getq(bus0_pipe *p)
+{
+ nni_msgq_aio_get(p->sendq, p->aio_getq);
+}
+
+static void
+bus0_pipe_recv(bus0_pipe *p)
+{
+ nni_pipe_recv(p->npipe, p->aio_recv);
+}
+
+static int
+bus0_sock_setopt_raw(void *arg, const void *buf, size_t sz)
+{
+ bus0_sock *s = arg;
+ return (nni_setopt_int(&s->raw, buf, sz, 0, 1));
+}
+
+static int
+bus0_sock_getopt_raw(void *arg, void *buf, size_t *szp)
+{
+ bus0_sock *s = arg;
+ return (nni_getopt_int(s->raw, buf, szp));
+}
+
+static void
+bus0_sock_send(void *arg, nni_aio *aio)
+{
+ bus0_sock *s = arg;
+
+ nni_msgq_aio_put(s->uwq, aio);
+}
+
+static void
+bus0_sock_recv(void *arg, nni_aio *aio)
+{
+ bus0_sock *s = arg;
+
+ nni_msgq_aio_get(s->urq, aio);
+}
+
+static nni_proto_pipe_ops bus0_pipe_ops = {
+ .pipe_init = bus0_pipe_init,
+ .pipe_fini = bus0_pipe_fini,
+ .pipe_start = bus0_pipe_start,
+ .pipe_stop = bus0_pipe_stop,
+};
+
+static nni_proto_sock_option bus0_sock_options[] = {
+ {
+ .pso_name = NNG_OPT_RAW,
+ .pso_getopt = bus0_sock_getopt_raw,
+ .pso_setopt = bus0_sock_setopt_raw,
+ },
+ // terminate list
+ { NULL, NULL, NULL },
+};
+
+static nni_proto_sock_ops bus0_sock_ops = {
+ .sock_init = bus0_sock_init,
+ .sock_fini = bus0_sock_fini,
+ .sock_open = bus0_sock_open,
+ .sock_close = bus0_sock_close,
+ .sock_send = bus0_sock_send,
+ .sock_recv = bus0_sock_recv,
+ .sock_options = bus0_sock_options,
+};
+
+static nni_proto bus0_proto = {
+ .proto_version = NNI_PROTOCOL_VERSION,
+ .proto_self = { NNI_PROTO_BUS_V0, "bus" },
+ .proto_peer = { NNI_PROTO_BUS_V0, "bus" },
+ .proto_flags = NNI_PROTO_FLAG_SNDRCV,
+ .proto_sock_ops = &bus0_sock_ops,
+ .proto_pipe_ops = &bus0_pipe_ops,
+};
+
+int
+nng_bus0_open(nng_socket *sidp)
+{
+ return (nni_proto_open(sidp, &bus0_proto));
+}
diff --git a/src/protocol/bus0/bus.h b/src/protocol/bus0/bus.h
new file mode 100644
index 00000000..0ef3d391
--- /dev/null
+++ b/src/protocol/bus0/bus.h
@@ -0,0 +1,28 @@
+//
+// 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.
+//
+
+#ifndef NNG_PROTOCOL_BUS0_BUS_H
+#define NNG_PROTOCOL_BUS0_BUS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+NNG_DECL int nng_bus0_open(nng_socket *);
+
+#ifndef nng_bus_open
+#define nng_bus_open nng_bus0_open
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NNG_PROTOCOL_BUS0_BUS_H
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2026-01-19 03:47:19 +0000