diff options
Diffstat (limited to 'src/protocol/pipeline0/push.c')
| -rw-r--r-- | src/protocol/pipeline0/push.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/src/protocol/pipeline0/push.c b/src/protocol/pipeline0/push.c new file mode 100644 index 00000000..3dd83fe0 --- /dev/null +++ b/src/protocol/pipeline0/push.c @@ -0,0 +1,267 @@ +// +// 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" + +// Push protocol. The PUSH protocol is the "write" side of a pipeline. +// Push distributes fairly, or tries to, by giving messages in round-robin +// order. + +#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 push0_pipe push0_pipe; +typedef struct push0_sock push0_sock; + +static void push0_send_cb(void *); +static void push0_recv_cb(void *); +static void push0_getq_cb(void *); + +// push0_sock is our per-socket protocol private structure. +struct push0_sock { + nni_msgq *uwq; + int raw; +}; + +// push0_pipe is our per-pipe protocol private structure. +struct push0_pipe { + nni_pipe * pipe; + push0_sock * push; + nni_list_node node; + + nni_aio *aio_recv; + nni_aio *aio_send; + nni_aio *aio_getq; +}; + +static int +push0_sock_init(void **sp, nni_sock *sock) +{ + push0_sock *s; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + s->raw = 0; + s->uwq = nni_sock_sendq(sock); + *sp = s; + return (0); +} + +static void +push0_sock_fini(void *arg) +{ + push0_sock *s = arg; + + NNI_FREE_STRUCT(s); +} + +static void +push0_sock_open(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +push0_sock_close(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +push0_pipe_fini(void *arg) +{ + push0_pipe *p = arg; + + nni_aio_fini(p->aio_recv); + nni_aio_fini(p->aio_send); + nni_aio_fini(p->aio_getq); + NNI_FREE_STRUCT(p); +} + +static int +push0_pipe_init(void **pp, nni_pipe *pipe, void *s) +{ + push0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + if (((rv = nni_aio_init(&p->aio_recv, push0_recv_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_send, push0_send_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_getq, push0_getq_cb, p)) != 0)) { + push0_pipe_fini(p); + return (rv); + } + NNI_LIST_NODE_INIT(&p->node); + p->pipe = pipe; + p->push = s; + *pp = p; + return (0); +} + +static int +push0_pipe_start(void *arg) +{ + push0_pipe *p = arg; + push0_sock *s = p->push; + + if (nni_pipe_peer(p->pipe) != NNI_PROTO_PULL_V0) { + return (NNG_EPROTO); + } + + // Schedule a receiver. This is mostly so that we can detect + // a closed transport pipe. + nni_pipe_recv(p->pipe, p->aio_recv); + + // Schedule a sender. + nni_msgq_aio_get(s->uwq, p->aio_getq); + + return (0); +} + +static void +push0_pipe_stop(void *arg) +{ + push0_pipe *p = arg; + + nni_aio_stop(p->aio_recv); + nni_aio_stop(p->aio_send); + nni_aio_stop(p->aio_getq); +} + +static void +push0_recv_cb(void *arg) +{ + push0_pipe *p = arg; + + // We normally expect to receive an error. If a pipe actually + // sends us data, we just discard it. + if (nni_aio_result(p->aio_recv) != 0) { + nni_pipe_stop(p->pipe); + return; + } + nni_msg_free(nni_aio_get_msg(p->aio_recv)); + nni_aio_set_msg(p->aio_recv, NULL); + nni_pipe_recv(p->pipe, p->aio_recv); +} + +static void +push0_send_cb(void *arg) +{ + push0_pipe *p = arg; + push0_sock *s = p->push; + + 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; + } + + nni_msgq_aio_get(s->uwq, p->aio_getq); +} + +static void +push0_getq_cb(void *arg) +{ + push0_pipe *p = arg; + nni_aio * aio = p->aio_getq; + + if (nni_aio_result(aio) != 0) { + // If the socket is closing, nothing else we can do. + nni_pipe_stop(p->pipe); + return; + } + + nni_aio_set_msg(p->aio_send, nni_aio_get_msg(aio)); + nni_aio_set_msg(aio, NULL); + + nni_pipe_send(p->pipe, p->aio_send); +} + +static int +push0_sock_setopt_raw(void *arg, const void *buf, size_t sz) +{ + push0_sock *s = arg; + return (nni_setopt_int(&s->raw, buf, sz, 0, 1)); +} + +static int +push0_sock_getopt_raw(void *arg, void *buf, size_t *szp) +{ + push0_sock *s = arg; + return (nni_getopt_int(s->raw, buf, szp)); +} + +static void +push0_sock_send(void *arg, nni_aio *aio) +{ + push0_sock *s = arg; + + nni_msgq_aio_put(s->uwq, aio); +} + +static void +push0_sock_recv(void *arg, nni_aio *aio) +{ + nni_aio_finish_error(aio, NNG_ENOTSUP); +} + +static nni_proto_pipe_ops push0_pipe_ops = { + .pipe_init = push0_pipe_init, + .pipe_fini = push0_pipe_fini, + .pipe_start = push0_pipe_start, + .pipe_stop = push0_pipe_stop, +}; + +static nni_proto_sock_option push0_sock_options[] = { + { + .pso_name = NNG_OPT_RAW, + .pso_getopt = push0_sock_getopt_raw, + .pso_setopt = push0_sock_setopt_raw, + }, + // terminate list + { NULL, NULL, NULL }, +}; + +static nni_proto_sock_ops push0_sock_ops = { + .sock_init = push0_sock_init, + .sock_fini = push0_sock_fini, + .sock_open = push0_sock_open, + .sock_close = push0_sock_close, + .sock_options = push0_sock_options, + .sock_send = push0_sock_send, + .sock_recv = push0_sock_recv, +}; + +static nni_proto push0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_PUSH_V0, "push" }, + .proto_peer = { NNI_PROTO_PULL_V0, "pull" }, + .proto_flags = NNI_PROTO_FLAG_SND, + .proto_pipe_ops = &push0_pipe_ops, + .proto_sock_ops = &push0_sock_ops, +}; + +int +nng_push0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &push0_proto)); +} |