1 files changed, 324 insertions, 0 deletions
diff --git a/src/protocol/reqrep0/xreq.c b/src/protocol/reqrep0/xreq.c
new file mode 100644
index 00000000..5c1841b2
--- /dev/null
+++ b/src/protocol/reqrep0/xreq.c
@@ -0,0 +1,324 @@
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "core/nng_impl.h"
+#include "protocol/reqrep0/req.h"
+
+// Request protocol.  The REQ protocol is the "request" side of a
+// request-reply pair.  This is useful for building RPC clients, for example.
+
+#ifndef NNI_PROTO_REQ_V0
+#define NNI_PROTO_REQ_V0 NNI_PROTO(3, 0)
+#endif
+
+#ifndef NNI_PROTO_REP_V0
+#define NNI_PROTO_REP_V0 NNI_PROTO(3, 1)
+#endif
+
+typedef struct xreq0_pipe xreq0_pipe;
+typedef struct xreq0_sock xreq0_sock;
+
+// An xreq0_sock is our per-socket protocol private structure.
+struct xreq0_sock {
+	nni_msgq *uwq;
+	nni_msgq *urq;
+	int       ttl;
+};
+
+// A req0_pipe is our per-pipe protocol private structure.
+struct xreq0_pipe {
+	nni_pipe *  pipe;
+	xreq0_sock *req;
+	nni_aio *   aio_getq;
+	nni_aio *   aio_send;
+	nni_aio *   aio_recv;
+	nni_aio *   aio_putq;
+};
+
+static void xreq0_sock_fini(void *);
+static void xreq0_getq_cb(void *);
+static void xreq0_send_cb(void *);
+static void xreq0_recv_cb(void *);
+static void xreq0_putq_cb(void *);
+
+static int
+xreq0_sock_init(void **sp, nni_sock *sock)
+{
+	xreq0_sock *s;
+
+	if ((s = NNI_ALLOC_STRUCT(s)) == NULL) {
+		return (NNG_ENOMEM);
+	}
+
+	s->ttl = 8;
+	s->uwq = nni_sock_sendq(sock);
+	s->urq = nni_sock_recvq(sock);
+	*sp    = s;
+
+	return (0);
+}
+
+static void
+xreq0_sock_open(void *arg)
+{
+	NNI_ARG_UNUSED(arg);
+}
+
+static void
+xreq0_sock_close(void *arg)
+{
+	NNI_ARG_UNUSED(arg);
+}
+
+static void
+xreq0_sock_fini(void *arg)
+{
+	xreq0_sock *s = arg;
+
+	NNI_FREE_STRUCT(s);
+}
+
+static void
+xreq0_pipe_fini(void *arg)
+{
+	xreq0_pipe *p = arg;
+
+	nni_aio_fini(p->aio_getq);
+	nni_aio_fini(p->aio_putq);
+	nni_aio_fini(p->aio_recv);
+	nni_aio_fini(p->aio_send);
+	NNI_FREE_STRUCT(p);
+}
+
+static int
+xreq0_pipe_init(void **pp, nni_pipe *pipe, void *s)
+{
+	xreq0_pipe *p;
+	int         rv;
+
+	if ((p = NNI_ALLOC_STRUCT(p)) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	if (((rv = nni_aio_init(&p->aio_getq, xreq0_getq_cb, p)) != 0) ||
+	    ((rv = nni_aio_init(&p->aio_putq, xreq0_putq_cb, p)) != 0) ||
+	    ((rv = nni_aio_init(&p->aio_recv, xreq0_recv_cb, p)) != 0) ||
+	    ((rv = nni_aio_init(&p->aio_send, xreq0_send_cb, p)) != 0)) {
+		xreq0_pipe_fini(p);
+		return (rv);
+	}
+
+	p->pipe = pipe;
+	p->req  = s;
+	*pp     = p;
+	return (0);
+}
+
+static int
+xreq0_pipe_start(void *arg)
+{
+	xreq0_pipe *p = arg;
+	xreq0_sock *s = p->req;
+
+	if (nni_pipe_peer(p->pipe) != NNI_PROTO_REP_V0) {
+		return (NNG_EPROTO);
+	}
+
+	nni_msgq_aio_get(s->uwq, p->aio_getq);
+	nni_pipe_recv(p->pipe, p->aio_recv);
+	return (0);
+}
+
+static void
+xreq0_pipe_stop(void *arg)
+{
+	xreq0_pipe *p = arg;
+
+	nni_aio_stop(p->aio_getq);
+	nni_aio_stop(p->aio_putq);
+	nni_aio_stop(p->aio_recv);
+	nni_aio_stop(p->aio_send);
+
+	// At this point there should not be any further AIOs running.
+	// Further, any completion tasks have completed.
+}
+
+// For raw mode we can just let the pipes "contend" via getq to get a
+// message from the upper write queue.  The msgqueue implementation
+// actually provides ordering, so load will be spread automatically.
+// (NB: We may have to revise this in the future if we want to provide some
+// kind of priority.)
+
+static void
+xreq0_getq_cb(void *arg)
+{
+	xreq0_pipe *p = arg;
+
+	if (nni_aio_result(p->aio_getq) != 0) {
+		nni_pipe_stop(p->pipe);
+		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->pipe, p->aio_send);
+}
+
+static void
+xreq0_send_cb(void *arg)
+{
+	xreq0_pipe *p = arg;
+
+	if (nni_aio_result(p->aio_send) != 0) {
+		nni_msg_free(nni_aio_get_msg(p->aio_send));
+		nni_aio_set_msg(p->aio_send, NULL);
+		nni_pipe_stop(p->pipe);
+		return;
+	}
+
+	// Sent a message so we just need to look for another one.
+	nni_msgq_aio_get(p->req->uwq, p->aio_getq);
+}
+
+static void
+xreq0_putq_cb(void *arg)
+{
+	xreq0_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->pipe);
+		return;
+	}
+	nni_aio_set_msg(p->aio_putq, NULL);
+
+	nni_pipe_recv(p->pipe, p->aio_recv);
+}
+
+static void
+xreq0_recv_cb(void *arg)
+{
+	xreq0_pipe *p    = arg;
+	xreq0_sock *sock = p->req;
+	nni_msg *   msg;
+	uint32_t    id;
+
+	if (nni_aio_result(p->aio_recv) != 0) {
+		nni_pipe_stop(p->pipe);
+		return;
+	}
+
+	msg = nni_aio_get_msg(p->aio_recv);
+	nni_aio_set_msg(p->aio_recv, NULL);
+	nni_msg_set_pipe(msg, nni_pipe_id(p->pipe));
+
+	// We yank 4 bytes from front of body, and move them to the header.
+	if (nni_msg_len(msg) < 4) {
+		// Malformed message.
+		goto malformed;
+	}
+	id = nni_msg_trim_u32(msg);
+	if (nni_msg_header_append_u32(msg, id) != 0) {
+		// Arguably we could just discard and carry on.  But
+		// dropping the connection is probably more helpful since
+		// it lets the other side see that a problem occurred.
+		// Plus it gives us a chance to reclaim some memory.
+		goto malformed;
+	}
+
+	nni_aio_set_msg(p->aio_putq, msg);
+	nni_msgq_aio_put(sock->urq, p->aio_putq);
+	return;
+
+malformed:
+	nni_msg_free(msg);
+	nni_pipe_stop(p->pipe);
+}
+
+static void
+xreq0_sock_send(void *arg, nni_aio *aio)
+{
+	xreq0_sock *s = arg;
+
+	nni_msgq_aio_put(s->uwq, aio);
+}
+
+static void
+xreq0_sock_recv(void *arg, nni_aio *aio)
+{
+	xreq0_sock *s = arg;
+
+	nni_msgq_aio_get(s->urq, aio);
+}
+
+static int
+xreq0_sock_setopt_maxttl(void *arg, const void *buf, size_t sz, int typ)
+{
+	xreq0_sock *s = arg;
+	return (nni_copyin_int(&s->ttl, buf, sz, 1, 255, typ));
+}
+
+static int
+xreq0_sock_getopt_maxttl(void *arg, void *buf, size_t *szp, int typ)
+{
+	xreq0_sock *s = arg;
+	return (nni_copyout_int(s->ttl, buf, szp, typ));
+}
+
+static nni_proto_pipe_ops xreq0_pipe_ops = {
+	.pipe_init  = xreq0_pipe_init,
+	.pipe_fini  = xreq0_pipe_fini,
+	.pipe_start = xreq0_pipe_start,
+	.pipe_stop  = xreq0_pipe_stop,
+};
+
+static nni_proto_sock_option xreq0_sock_options[] = {
+	{
+	    .pso_name   = NNG_OPT_MAXTTL,
+	    .pso_type   = NNI_TYPE_INT32,
+	    .pso_getopt = xreq0_sock_getopt_maxttl,
+	    .pso_setopt = xreq0_sock_setopt_maxttl,
+	},
+	// terminate list
+	{
+	    .pso_name = NULL,
+	},
+};
+
+static nni_proto_sock_ops xreq0_sock_ops = {
+	.sock_init    = xreq0_sock_init,
+	.sock_fini    = xreq0_sock_fini,
+	.sock_open    = xreq0_sock_open,
+	.sock_close   = xreq0_sock_close,
+	.sock_options = xreq0_sock_options,
+	.sock_send    = xreq0_sock_send,
+	.sock_recv    = xreq0_sock_recv,
+};
+
+static nni_proto xreq0_proto = {
+	.proto_version  = NNI_PROTOCOL_VERSION,
+	.proto_self     = { NNI_PROTO_REQ_V0, "req" },
+	.proto_peer     = { NNI_PROTO_REP_V0, "rep" },
+	.proto_flags    = NNI_PROTO_FLAG_SNDRCV | NNI_PROTO_FLAG_RAW,
+	.proto_sock_ops = &xreq0_sock_ops,
+	.proto_pipe_ops = &xreq0_pipe_ops,
+	.proto_ctx_ops  = NULL, // raw mode does not support contexts
+};
+
+int
+nng_req0_open_raw(nng_socket *sidp)
+{
+	return (nni_proto_open(sidp, &xreq0_proto));
+}