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Diffstat (limited to 'src/protocol/survey0/xsurvey.c')
| -rw-r--r-- | src/protocol/survey0/xsurvey.c | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/src/protocol/survey0/xsurvey.c b/src/protocol/survey0/xsurvey.c new file mode 100644 index 00000000..cf311b15 --- /dev/null +++ b/src/protocol/survey0/xsurvey.c @@ -0,0 +1,380 @@ +// +// 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 <stdlib.h> +#include <string.h> + +#include "core/nng_impl.h" +#include "protocol/survey0/survey.h" + +// Surveyor protocol. The SURVEYOR protocol is the "survey" side of the +// survey pattern. This is useful for building service discovery, voting, etc. + +#ifndef NNI_PROTO_SURVEYOR_V0 +#define NNI_PROTO_SURVEYOR_V0 NNI_PROTO(6, 2) +#endif + +#ifndef NNI_PROTO_RESPONDENT_V0 +#define NNI_PROTO_RESPONDENT_V0 NNI_PROTO(6, 3) +#endif + +typedef struct xsurv0_pipe xsurv0_pipe; +typedef struct xsurv0_sock xsurv0_sock; + +static void xsurv0_sock_getq_cb(void *); +static void xsurv0_getq_cb(void *); +static void xsurv0_putq_cb(void *); +static void xsurv0_send_cb(void *); +static void xsurv0_recv_cb(void *); + +// surv0_sock is our per-socket protocol private structure. +struct xsurv0_sock { + int ttl; + nni_list pipes; + nni_aio * aio_getq; + nni_msgq *uwq; + nni_msgq *urq; + nni_mtx mtx; +}; + +// surv0_pipe is our per-pipe protocol private structure. +struct xsurv0_pipe { + nni_pipe * npipe; + xsurv0_sock * psock; + nni_msgq * sendq; + nni_list_node node; + nni_aio * aio_getq; + nni_aio * aio_putq; + nni_aio * aio_send; + nni_aio * aio_recv; +}; + +static void +xsurv0_sock_fini(void *arg) +{ + xsurv0_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 +xsurv0_sock_init(void **sp, nni_sock *nsock) +{ + xsurv0_sock *s; + int rv; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + if ((rv = nni_aio_init(&s->aio_getq, xsurv0_sock_getq_cb, s)) != 0) { + xsurv0_sock_fini(s); + return (rv); + } + NNI_LIST_INIT(&s->pipes, xsurv0_pipe, node); + nni_mtx_init(&s->mtx); + + s->uwq = nni_sock_sendq(nsock); + s->urq = nni_sock_recvq(nsock); + s->ttl = 8; + + *sp = s; + return (0); +} + +static void +xsurv0_sock_open(void *arg) +{ + xsurv0_sock *s = arg; + + nni_msgq_aio_get(s->uwq, s->aio_getq); +} + +static void +xsurv0_sock_close(void *arg) +{ + xsurv0_sock *s = arg; + + nni_aio_abort(s->aio_getq, NNG_ECLOSED); +} + +static void +xsurv0_pipe_fini(void *arg) +{ + xsurv0_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_FREE_STRUCT(p); +} + +static int +xsurv0_pipe_init(void **pp, nni_pipe *npipe, void *s) +{ + xsurv0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + // This depth could be tunable. The queue exists so that if we + // have multiple requests coming in faster than we can deliver them, + // we try to avoid dropping them. We don't really have a solution + // for applying backpressure. It would be nice if surveys carried + // an expiration with them, so that we could discard any that are + // not delivered before their expiration date. + if (((rv = nni_msgq_init(&p->sendq, 16)) != 0) || + ((rv = nni_aio_init(&p->aio_getq, xsurv0_getq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_putq, xsurv0_putq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_send, xsurv0_send_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_recv, xsurv0_recv_cb, p)) != 0)) { + xsurv0_pipe_fini(p); + return (rv); + } + + p->npipe = npipe; + p->psock = s; + *pp = p; + return (0); +} + +static int +xsurv0_pipe_start(void *arg) +{ + xsurv0_pipe *p = arg; + xsurv0_sock *s = p->psock; + + nni_mtx_lock(&s->mtx); + nni_list_append(&s->pipes, p); + nni_mtx_unlock(&s->mtx); + + nni_msgq_aio_get(p->sendq, p->aio_getq); + nni_pipe_recv(p->npipe, p->aio_recv); + return (0); +} + +static void +xsurv0_pipe_stop(void *arg) +{ + xsurv0_pipe *p = arg; + xsurv0_sock *s = p->psock; + + 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_msgq_close(p->sendq); + + 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 +xsurv0_getq_cb(void *arg) +{ + xsurv0_pipe *p = arg; + + if (nni_aio_result(p->aio_getq) != 0) { + 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 +xsurv0_send_cb(void *arg) +{ + xsurv0_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->npipe); + return; + } + + nni_msgq_aio_get(p->sendq, p->aio_getq); +} + +static void +xsurv0_putq_cb(void *arg) +{ + xsurv0_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; + } + + nni_pipe_recv(p->npipe, p->aio_recv); +} + +static void +xsurv0_recv_cb(void *arg) +{ + xsurv0_pipe *p = arg; + 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); + nni_aio_set_msg(p->aio_recv, NULL); + nni_msg_set_pipe(msg, nni_pipe_id(p->npipe)); + + // We yank 4 bytes of body, and move them to the header. + if (nni_msg_len(msg) < 4) { + // Peer gave us garbage, so kick it. + nni_msg_free(msg); + nni_pipe_stop(p->npipe); + return; + } + if (nni_msg_header_append(msg, nni_msg_body(msg), 4) != 0) { + // Probably ENOMEM, discard and keep going. + nni_msg_free(msg); + nni_pipe_recv(p->npipe, p->aio_recv); + return; + } + (void) nni_msg_trim(msg, 4); + + nni_aio_set_msg(p->aio_putq, msg); + nni_msgq_aio_put(p->psock->urq, p->aio_putq); +} + +static int +xsurv0_sock_setopt_maxttl(void *arg, const void *buf, size_t sz, int typ) +{ + xsurv0_sock *s = arg; + return (nni_copyin_int(&s->ttl, buf, sz, 1, 255, typ)); +} + +static int +xsurv0_sock_getopt_maxttl(void *arg, void *buf, size_t *szp, int typ) +{ + xsurv0_sock *s = arg; + return (nni_copyout_int(s->ttl, buf, szp, typ)); +} + +static void +xsurv0_sock_getq_cb(void *arg) +{ + xsurv0_sock *s = arg; + xsurv0_pipe *p; + xsurv0_pipe *last; + nni_msg * msg, *dup; + + if (nni_aio_result(s->aio_getq) != 0) { + // Should be NNG_ECLOSED. + return; + } + msg = nni_aio_get_msg(s->aio_getq); + nni_aio_set_msg(s->aio_getq, NULL); + + nni_mtx_lock(&s->mtx); + last = nni_list_last(&s->pipes); + NNI_LIST_FOREACH (&s->pipes, p) { + if (p != last) { + if (nni_msg_dup(&dup, msg) != 0) { + continue; + } + } else { + dup = msg; + } + if (nni_msgq_tryput(p->sendq, dup) != 0) { + nni_msg_free(dup); + } + } + + nni_msgq_aio_get(s->uwq, s->aio_getq); + nni_mtx_unlock(&s->mtx); + + if (last == NULL) { + // If there were no pipes to send on, just toss the message. + nni_msg_free(msg); + } +} + +static void +xsurv0_sock_recv(void *arg, nni_aio *aio) +{ + xsurv0_sock *s = arg; + + nni_msgq_aio_get(s->urq, aio); +} + +static void +xsurv0_sock_send(void *arg, nni_aio *aio) +{ + xsurv0_sock *s = arg; + + nni_msgq_aio_put(s->uwq, aio); +} + +static nni_proto_pipe_ops xsurv0_pipe_ops = { + .pipe_init = xsurv0_pipe_init, + .pipe_fini = xsurv0_pipe_fini, + .pipe_start = xsurv0_pipe_start, + .pipe_stop = xsurv0_pipe_stop, +}; + +static nni_proto_sock_option xsurv0_sock_options[] = { + { + .pso_name = NNG_OPT_MAXTTL, + .pso_type = NNI_TYPE_INT32, + .pso_getopt = xsurv0_sock_getopt_maxttl, + .pso_setopt = xsurv0_sock_setopt_maxttl, + }, + // terminate list + { + .pso_name = NULL, + }, +}; + +static nni_proto_sock_ops xsurv0_sock_ops = { + .sock_init = xsurv0_sock_init, + .sock_fini = xsurv0_sock_fini, + .sock_open = xsurv0_sock_open, + .sock_close = xsurv0_sock_close, + .sock_send = xsurv0_sock_send, + .sock_recv = xsurv0_sock_recv, + .sock_options = xsurv0_sock_options, +}; + +static nni_proto xsurv0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_SURVEYOR_V0, "surveyor" }, + .proto_peer = { NNI_PROTO_RESPONDENT_V0, "respondent" }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV | NNI_PROTO_FLAG_RAW, + .proto_sock_ops = &xsurv0_sock_ops, + .proto_pipe_ops = &xsurv0_pipe_ops, +}; + +int +nng_surveyor0_open_raw(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &xsurv0_proto)); +} |