diff options
Diffstat (limited to 'src/sp/protocol/pair0')
| -rw-r--r-- | src/sp/protocol/pair0/CMakeLists.txt | 16 | ||||
| -rw-r--r-- | src/sp/protocol/pair0/pair.c | 305 |
2 files changed, 321 insertions, 0 deletions
diff --git a/src/sp/protocol/pair0/CMakeLists.txt b/src/sp/protocol/pair0/CMakeLists.txt new file mode 100644 index 00000000..b12583ab --- /dev/null +++ b/src/sp/protocol/pair0/CMakeLists.txt @@ -0,0 +1,16 @@ +# +# Copyright 2020 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. +# + +# PAIRv0 protocol +nng_directory(pair0) + +nng_sources_if(NNG_PROTO_PAIR0 pair.c) +nng_headers_if(NNG_PROTO_PAIR0 nng/protocol/pair0/pair.h) +nng_defines_if(NNG_PROTO_PAIR0 NNG_HAVE_PAIR0)
\ No newline at end of file diff --git a/src/sp/protocol/pair0/pair.c b/src/sp/protocol/pair0/pair.c new file mode 100644 index 00000000..41f88c7c --- /dev/null +++ b/src/sp/protocol/pair0/pair.c @@ -0,0 +1,305 @@ +// +// Copyright 2020 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 <stdlib.h> + +#include "core/nng_impl.h" +#include "nng/protocol/pair0/pair.h" + +// Pair protocol. The PAIR protocol is a simple 1:1 messaging pattern. +// While a peer is connected to the server, all other peer connection +// attempts are discarded. + +#ifndef NNI_PROTO_PAIR_V0 +#define NNI_PROTO_PAIR_V0 NNI_PROTO(1, 0) +#endif + +typedef struct pair0_pipe pair0_pipe; +typedef struct pair0_sock pair0_sock; + +static void pair0_send_cb(void *); +static void pair0_recv_cb(void *); +static void pair0_getq_cb(void *); +static void pair0_putq_cb(void *); +static void pair0_pipe_fini(void *); + +// pair0_sock is our per-socket protocol private structure. +struct pair0_sock { + pair0_pipe *ppipe; + nni_msgq * uwq; + nni_msgq * urq; + nni_mtx mtx; +}; + +// An pair0_pipe is our per-pipe protocol private structure. We keep +// one of these even though in theory we'd only have a single underlying +// pipe. The separate data structure is more like other protocols that do +// manage multiple pipes. +struct pair0_pipe { + nni_pipe * npipe; + pair0_sock *psock; + nni_aio aio_send; + nni_aio aio_recv; + nni_aio aio_getq; + nni_aio aio_putq; +}; + +static int +pair0_sock_init(void *arg, nni_sock *nsock) +{ + pair0_sock *s = arg; + + nni_mtx_init(&s->mtx); + s->ppipe = NULL; + s->uwq = nni_sock_sendq(nsock); + s->urq = nni_sock_recvq(nsock); + return (0); +} + +static void +pair0_sock_fini(void *arg) +{ + pair0_sock *s = arg; + + nni_mtx_fini(&s->mtx); +} + +static void +pair0_pipe_stop(void *arg) +{ + pair0_pipe *p = arg; + + nni_aio_stop(&p->aio_send); + nni_aio_stop(&p->aio_recv); + nni_aio_stop(&p->aio_putq); + nni_aio_stop(&p->aio_getq); +} + +static void +pair0_pipe_fini(void *arg) +{ + pair0_pipe *p = arg; + + nni_aio_fini(&p->aio_send); + nni_aio_fini(&p->aio_recv); + nni_aio_fini(&p->aio_putq); + nni_aio_fini(&p->aio_getq); +} + +static int +pair0_pipe_init(void *arg, nni_pipe *npipe, void *psock) +{ + pair0_pipe *p = arg; + + nni_aio_init(&p->aio_send, pair0_send_cb, p); + nni_aio_init(&p->aio_recv, pair0_recv_cb, p); + nni_aio_init(&p->aio_getq, pair0_getq_cb, p); + nni_aio_init(&p->aio_putq, pair0_putq_cb, p); + + p->npipe = npipe; + p->psock = psock; + return (0); +} + +static int +pair0_pipe_start(void *arg) +{ + pair0_pipe *p = arg; + pair0_sock *s = p->psock; + + if (nni_pipe_peer(p->npipe) != NNI_PROTO_PAIR_V0) { + // Peer protocol mismatch. + return (NNG_EPROTO); + } + + nni_mtx_lock(&s->mtx); + if (s->ppipe != NULL) { + nni_mtx_unlock(&s->mtx); + return (NNG_EBUSY); // Already have a peer, denied. + } + s->ppipe = p; + nni_mtx_unlock(&s->mtx); + + // Schedule a getq on the upper, and a read from the pipe. + // Each of these also sets up another hold on the pipe itself. + nni_msgq_aio_get(s->uwq, &p->aio_getq); + nni_pipe_recv(p->npipe, &p->aio_recv); + + return (0); +} + +static void +pair0_pipe_close(void *arg) +{ + pair0_pipe *p = arg; + pair0_sock *s = p->psock; + + nni_aio_close(&p->aio_send); + nni_aio_close(&p->aio_recv); + nni_aio_close(&p->aio_putq); + nni_aio_close(&p->aio_getq); + + nni_mtx_lock(&s->mtx); + if (s->ppipe == p) { + s->ppipe = NULL; + } + nni_mtx_unlock(&s->mtx); +} + +static void +pair0_recv_cb(void *arg) +{ + pair0_pipe *p = arg; + pair0_sock *s = p->psock; + nni_msg * msg; + + if (nni_aio_result(&p->aio_recv) != 0) { + nni_pipe_close(p->npipe); + return; + } + + msg = nni_aio_get_msg(&p->aio_recv); + nni_aio_set_msg(&p->aio_putq, msg); + nni_aio_set_msg(&p->aio_recv, NULL); + + nni_msg_set_pipe(msg, nni_pipe_id(p->npipe)); + nni_msgq_aio_put(s->urq, &p->aio_putq); +} + +static void +pair0_putq_cb(void *arg) +{ + pair0_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_close(p->npipe); + return; + } + nni_pipe_recv(p->npipe, &p->aio_recv); +} + +static void +pair0_getq_cb(void *arg) +{ + pair0_pipe *p = arg; + + if (nni_aio_result(&p->aio_getq) != 0) { + nni_pipe_close(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 +pair0_send_cb(void *arg) +{ + pair0_pipe *p = arg; + pair0_sock *s = p->psock; + + 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_close(p->npipe); + return; + } + + nni_msgq_aio_get(s->uwq, &p->aio_getq); +} + +static void +pair0_sock_open(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +pair0_sock_close(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +pair0_sock_send(void *arg, nni_aio *aio) +{ + pair0_sock *s = arg; + + nni_msgq_aio_put(s->uwq, aio); +} + +static void +pair0_sock_recv(void *arg, nni_aio *aio) +{ + pair0_sock *s = arg; + + nni_msgq_aio_get(s->urq, aio); +} + +static nni_proto_pipe_ops pair0_pipe_ops = { + .pipe_size = sizeof(pair0_pipe), + .pipe_init = pair0_pipe_init, + .pipe_fini = pair0_pipe_fini, + .pipe_start = pair0_pipe_start, + .pipe_close = pair0_pipe_close, + .pipe_stop = pair0_pipe_stop, +}; + +static nni_option pair0_sock_options[] = { + // terminate list + { + .o_name = NULL, + } +}; + +static nni_proto_sock_ops pair0_sock_ops = { + .sock_size = sizeof(pair0_sock), + .sock_init = pair0_sock_init, + .sock_fini = pair0_sock_fini, + .sock_open = pair0_sock_open, + .sock_close = pair0_sock_close, + .sock_send = pair0_sock_send, + .sock_recv = pair0_sock_recv, + .sock_options = pair0_sock_options, +}; + +// Legacy protocol (v0) +static nni_proto pair0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_PAIR_V0, "pair" }, + .proto_peer = { NNI_PROTO_PAIR_V0, "pair" }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV, + .proto_sock_ops = &pair0_sock_ops, + .proto_pipe_ops = &pair0_pipe_ops, +}; + +static nni_proto pair0_proto_raw = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_PAIR_V0, "pair" }, + .proto_peer = { NNI_PROTO_PAIR_V0, "pair" }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV | NNI_PROTO_FLAG_RAW, + .proto_sock_ops = &pair0_sock_ops, + .proto_pipe_ops = &pair0_pipe_ops, +}; + +int +nng_pair0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &pair0_proto)); +} + +int +nng_pair0_open_raw(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &pair0_proto_raw)); +} |