1 files changed, 250 insertions, 0 deletions
diff --git a/src/protocol/pipeline0/pull.c b/src/protocol/pipeline0/pull.c
new file mode 100644
index 00000000..8c16cb17
--- /dev/null
+++ b/src/protocol/pipeline0/pull.c
@@ -0,0 +1,250 @@
+//
+// 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.
+
+#ifndef NNI_PROTO_PULL_V0
+#define NNI_PROTO_PULL_V0 NNI_PROTO(5, 1)
+#endif
+
+#ifndef NNI_PROTO_PUSH_V0
+#define NNI_PROTO_PUSH_V0 NNI_PROTO(5, 0)
+#endif
+
+typedef struct pull0_pipe pull0_pipe;
+typedef struct pull0_sock pull0_sock;
+
+static void pull0_putq_cb(void *);
+static void pull0_recv_cb(void *);
+static void pull0_putq(pull0_pipe *, nni_msg *);
+
+// pull0_sock is our per-socket protocol private structure.
+struct pull0_sock {
+	nni_msgq *urq;
+	int       raw;
+};
+
+// pull0_pipe is our per-pipe protocol private structure.
+struct pull0_pipe {
+	nni_pipe *  pipe;
+	pull0_sock *pull;
+	nni_aio *   putq_aio;
+	nni_aio *   recv_aio;
+};
+
+static int
+pull0_sock_init(void **sp, nni_sock *sock)
+{
+	pull0_sock *s;
+
+	if ((s = NNI_ALLOC_STRUCT(s)) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	s->raw = 0;
+	s->urq = nni_sock_recvq(sock);
+
+	*sp = s;
+	return (0);
+}
+
+static void
+pull0_sock_fini(void *arg)
+{
+	pull0_sock *s = arg;
+
+	NNI_FREE_STRUCT(s);
+}
+
+static void
+pull0_pipe_fini(void *arg)
+{
+	pull0_pipe *p = arg;
+
+	nni_aio_fini(p->putq_aio);
+	nni_aio_fini(p->recv_aio);
+	NNI_FREE_STRUCT(p);
+}
+
+static int
+pull0_pipe_init(void **pp, nni_pipe *pipe, void *s)
+{
+	pull0_pipe *p;
+	int         rv;
+
+	if ((p = NNI_ALLOC_STRUCT(p)) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	if (((rv = nni_aio_init(&p->putq_aio, pull0_putq_cb, p)) != 0) ||
+	    ((rv = nni_aio_init(&p->recv_aio, pull0_recv_cb, p)) != 0)) {
+		pull0_pipe_fini(p);
+		return (rv);
+	}
+
+	p->pipe = pipe;
+	p->pull = s;
+	*pp     = p;
+	return (0);
+}
+
+static int
+pull0_pipe_start(void *arg)
+{
+	pull0_pipe *p = arg;
+
+	// Start the pending pull...
+	nni_pipe_recv(p->pipe, p->recv_aio);
+
+	return (0);
+}
+
+static void
+pull0_pipe_stop(void *arg)
+{
+	pull0_pipe *p = arg;
+
+	nni_aio_stop(p->putq_aio);
+	nni_aio_stop(p->recv_aio);
+}
+
+static void
+pull0_recv_cb(void *arg)
+{
+	pull0_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);
+	pull0_putq(p, msg);
+}
+
+static void
+pull0_putq_cb(void *arg)
+{
+	pull0_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);
+}
+
+// pull0_putq schedules a put operation to the user socket (sendup).
+static void
+pull0_putq(pull0_pipe *p, nni_msg *msg)
+{
+	pull0_sock *s = p->pull;
+
+	nni_aio_set_msg(p->putq_aio, msg);
+
+	nni_msgq_aio_put(s->urq, p->putq_aio);
+}
+
+static void
+pull0_sock_open(void *arg)
+{
+	NNI_ARG_UNUSED(arg);
+}
+
+static void
+pull0_sock_close(void *arg)
+{
+	NNI_ARG_UNUSED(arg);
+}
+
+static int
+pull0_sock_setopt_raw(void *arg, const void *buf, size_t sz)
+{
+	pull0_sock *s = arg;
+	return (nni_setopt_int(&s->raw, buf, sz, 0, 1));
+}
+
+static int
+pull0_sock_getopt_raw(void *arg, void *buf, size_t *szp)
+{
+	pull0_sock *s = arg;
+	return (nni_getopt_int(s->raw, buf, szp));
+}
+
+static void
+pull0_sock_send(void *arg, nni_aio *aio)
+{
+	nni_aio_finish_error(aio, NNG_ENOTSUP);
+}
+
+static void
+pull0_sock_recv(void *arg, nni_aio *aio)
+{
+	pull0_sock *s = arg;
+
+	nni_msgq_aio_get(s->urq, aio);
+}
+
+static nni_proto_pipe_ops pull0_pipe_ops = {
+	.pipe_init  = pull0_pipe_init,
+	.pipe_fini  = pull0_pipe_fini,
+	.pipe_start = pull0_pipe_start,
+	.pipe_stop  = pull0_pipe_stop,
+};
+
+static nni_proto_sock_option pull0_sock_options[] = {
+	{
+	    .pso_name   = NNG_OPT_RAW,
+	    .pso_getopt = pull0_sock_getopt_raw,
+	    .pso_setopt = pull0_sock_setopt_raw,
+	},
+	// terminate list
+	{ NULL, NULL, NULL },
+};
+
+static nni_proto_sock_ops pull0_sock_ops = {
+	.sock_init    = pull0_sock_init,
+	.sock_fini    = pull0_sock_fini,
+	.sock_open    = pull0_sock_open,
+	.sock_close   = pull0_sock_close,
+	.sock_send    = pull0_sock_send,
+	.sock_recv    = pull0_sock_recv,
+	.sock_options = pull0_sock_options,
+};
+
+static nni_proto pull0_proto = {
+	.proto_version  = NNI_PROTOCOL_VERSION,
+	.proto_self     = { NNI_PROTO_PULL_V0, "pull" },
+	.proto_peer     = { NNI_PROTO_PUSH_V0, "push" },
+	.proto_flags    = NNI_PROTO_FLAG_RCV,
+	.proto_pipe_ops = &pull0_pipe_ops,
+	.proto_sock_ops = &pull0_sock_ops,
+};
+
+int
+nng_pull0_open(nng_socket *sidp)
+{
+	return (nni_proto_open(sidp, &pull0_proto));
+}