diff options
Diffstat (limited to 'src/protocol/survey0')
| -rw-r--r-- | src/protocol/survey0/CMakeLists.txt | 23 | ||||
| -rw-r--r-- | src/protocol/survey0/respond.c | 509 | ||||
| -rw-r--r-- | src/protocol/survey0/respond.h | 28 | ||||
| -rw-r--r-- | src/protocol/survey0/survey.c | 484 | ||||
| -rw-r--r-- | src/protocol/survey0/survey.h | 30 |
5 files changed, 1074 insertions, 0 deletions
diff --git a/src/protocol/survey0/CMakeLists.txt b/src/protocol/survey0/CMakeLists.txt new file mode 100644 index 00000000..61e5aa7b --- /dev/null +++ b/src/protocol/survey0/CMakeLists.txt @@ -0,0 +1,23 @@ +# +# 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. +# + +# Req/Rep protocol + +if (NNG_PROTO_SURVEYOR0) + set(SURV0_SOURCES protocol/survey0/survey.c protocol/survey0/survey.h) + install(FILES survey.h DESTINATION include/nng/protocol/survey0) +endif() + +if (NNG_PROTO_RESPONDENT0) + set(RESP0_SOURCES protocol/survey0/respond.c protocol/survey0/respond.h) + install(FILES respond.h DESTINATION include/nng/protocol/survey0) +endif() + +set(NNG_SOURCES ${NNG_SOURCES} ${SURV0_SOURCES} ${RESP0_SOURCES} PARENT_SCOPE)
\ No newline at end of file diff --git a/src/protocol/survey0/respond.c b/src/protocol/survey0/respond.c new file mode 100644 index 00000000..73e919c3 --- /dev/null +++ b/src/protocol/survey0/respond.c @@ -0,0 +1,509 @@ +// +// 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" +#include "protocol/survey0/respond.h" + +// Respondent protocol. The RESPONDENT protocol is the "replier" side of +// the surveyor pattern. This is useful for building service discovery, or +// voting algorithms, for example. + +#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 resp0_pipe resp0_pipe; +typedef struct resp0_sock resp0_sock; + +static void resp0_recv_cb(void *); +static void resp0_putq_cb(void *); +static void resp0_getq_cb(void *); +static void resp0_send_cb(void *); +static void resp0_sock_getq_cb(void *); +static void resp0_pipe_fini(void *); + +// resp0_sock is our per-socket protocol private structure. +struct resp0_sock { + nni_msgq * urq; + nni_msgq * uwq; + int raw; + int ttl; + nni_idhash *pipes; + char * btrace; + size_t btrace_len; + nni_aio * aio_getq; + nni_mtx mtx; +}; + +// resp0_pipe is our per-pipe protocol private structure. +struct resp0_pipe { + nni_pipe * npipe; + resp0_sock *psock; + uint32_t id; + nni_msgq * sendq; + nni_aio * aio_getq; + nni_aio * aio_putq; + nni_aio * aio_send; + nni_aio * aio_recv; +}; + +static void +resp0_sock_fini(void *arg) +{ + resp0_sock *s = arg; + + nni_aio_stop(s->aio_getq); + nni_aio_fini(s->aio_getq); + nni_idhash_fini(s->pipes); + if (s->btrace != NULL) { + nni_free(s->btrace, s->btrace_len); + } + nni_mtx_fini(&s->mtx); + NNI_FREE_STRUCT(s); +} + +static int +resp0_sock_init(void **sp, nni_sock *nsock) +{ + resp0_sock *s; + int rv; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + nni_mtx_init(&s->mtx); + if (((rv = nni_idhash_init(&s->pipes)) != 0) || + ((rv = nni_aio_init(&s->aio_getq, resp0_sock_getq_cb, s)) != 0)) { + resp0_sock_fini(s); + return (rv); + } + + s->ttl = 8; // Per RFC + s->raw = 0; + s->btrace = NULL; + s->btrace_len = 0; + s->urq = nni_sock_recvq(nsock); + s->uwq = nni_sock_sendq(nsock); + + *sp = s; + return (0); +} + +static void +resp0_sock_open(void *arg) +{ + resp0_sock *s = arg; + + nni_msgq_aio_get(s->uwq, s->aio_getq); +} + +static void +resp0_sock_close(void *arg) +{ + resp0_sock *s = arg; + + nni_aio_cancel(s->aio_getq, NNG_ECLOSED); +} + +static void +resp0_pipe_fini(void *arg) +{ + resp0_pipe *p = arg; + + nni_aio_fini(p->aio_putq); + nni_aio_fini(p->aio_getq); + nni_aio_fini(p->aio_send); + nni_aio_fini(p->aio_recv); + nni_msgq_fini(p->sendq); + NNI_FREE_STRUCT(p); +} + +static int +resp0_pipe_init(void **pp, nni_pipe *npipe, void *s) +{ + resp0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + if (((rv = nni_msgq_init(&p->sendq, 2)) != 0) || + ((rv = nni_aio_init(&p->aio_putq, resp0_putq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_recv, resp0_recv_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_getq, resp0_getq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_send, resp0_send_cb, p)) != 0)) { + resp0_pipe_fini(p); + return (rv); + } + + p->npipe = npipe; + p->psock = s; + *pp = p; + return (0); +} + +static int +resp0_pipe_start(void *arg) +{ + resp0_pipe *p = arg; + resp0_sock *s = p->psock; + int rv; + + p->id = nni_pipe_id(p->npipe); + + nni_mtx_lock(&s->mtx); + rv = nni_idhash_insert(s->pipes, p->id, p); + nni_mtx_unlock(&s->mtx); + if (rv != 0) { + return (rv); + } + + nni_pipe_recv(p->npipe, p->aio_recv); + nni_msgq_aio_get(p->sendq, p->aio_getq); + + return (rv); +} + +static void +resp0_pipe_stop(void *arg) +{ + resp0_pipe *p = arg; + resp0_sock *s = p->psock; + + nni_msgq_close(p->sendq); + nni_aio_stop(p->aio_putq); + nni_aio_stop(p->aio_getq); + nni_aio_stop(p->aio_send); + nni_aio_stop(p->aio_recv); + + if (p->id != 0) { + nni_mtx_lock(&s->mtx); + nni_idhash_remove(s->pipes, p->id); + nni_mtx_unlock(&s->mtx); + p->id = 0; + } +} + +// resp0_sock_send watches for messages from the upper write queue, +// extracts the destination pipe, and forwards it to the appropriate +// destination pipe via a separate queue. This prevents a single bad +// or slow pipe from gumming up the works for the entire socket.s + +void +resp0_sock_getq_cb(void *arg) +{ + resp0_sock *s = arg; + nni_msg * msg; + uint32_t id; + resp0_pipe *p; + int rv; + + if (nni_aio_result(s->aio_getq) != 0) { + return; + } + msg = nni_aio_get_msg(s->aio_getq); + nni_aio_set_msg(s->aio_getq, NULL); + + // We yank the outgoing pipe id from the header + if (nni_msg_header_len(msg) < 4) { + nni_msg_free(msg); + // We can't really close down the socket, so just keep going. + nni_msgq_aio_get(s->uwq, s->aio_getq); + return; + } + id = nni_msg_header_trim_u32(msg); + + nni_mtx_lock(&s->mtx); + if ((rv = nni_idhash_find(s->pipes, id, (void **) &p)) != 0) { + // Destination pipe not present. + nni_msg_free(msg); + } else { + // Non-blocking put. + if (nni_msgq_tryput(p->sendq, msg) != 0) { + nni_msg_free(msg); + } + } + nni_msgq_aio_get(s->uwq, s->aio_getq); + nni_mtx_unlock(&s->mtx); +} + +void +resp0_getq_cb(void *arg) +{ + resp0_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); +} + +void +resp0_send_cb(void *arg) +{ + resp0_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 +resp0_recv_cb(void *arg) +{ + resp0_pipe *p = arg; + resp0_sock *s = p->psock; + nni_msgq * urq = s->urq; + nni_msg * msg; + int hops; + int rv; + + if (nni_aio_result(p->aio_recv) != 0) { + goto error; + } + + msg = nni_aio_get_msg(p->aio_recv); + nni_aio_set_msg(p->aio_recv, NULL); + nni_msg_set_pipe(msg, p->id); + + // Store the pipe id in the header, first thing. + if (nni_msg_header_append_u32(msg, p->id) != 0) { + nni_msg_free(msg); + goto error; + } + + // Move backtrace from body to header + hops = 0; + for (;;) { + int end = 0; + uint8_t *body; + + if (hops >= s->ttl) { + nni_msg_free(msg); + goto error; + } + if (nni_msg_len(msg) < 4) { + nni_msg_free(msg); + goto error; + } + body = nni_msg_body(msg); + end = (body[0] & 0x80) ? 1 : 0; + rv = nni_msg_header_append(msg, body, 4); + if (rv != 0) { + nni_msg_free(msg); + goto error; + } + nni_msg_trim(msg, 4); + if (end) { + break; + } + } + + // Now send it up. + nni_aio_set_msg(p->aio_putq, msg); + nni_msgq_aio_put(urq, p->aio_putq); + return; + +error: + nni_pipe_stop(p->npipe); +} + +static void +resp0_putq_cb(void *arg) +{ + resp0_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); + } + + nni_pipe_recv(p->npipe, p->aio_recv); +} + +static int +resp0_sock_setopt_raw(void *arg, const void *buf, size_t sz) +{ + resp0_sock *s = arg; + int rv; + + nni_mtx_lock(&s->mtx); + rv = nni_setopt_int(&s->raw, buf, sz, 0, 1); + nni_mtx_unlock(&s->mtx); + return (rv); +} + +static int +resp0_sock_getopt_raw(void *arg, void *buf, size_t *szp) +{ + resp0_sock *s = arg; + return (nni_getopt_int(s->raw, buf, szp)); +} + +static int +resp0_sock_setopt_maxttl(void *arg, const void *buf, size_t sz) +{ + resp0_sock *s = arg; + return (nni_setopt_int(&s->ttl, buf, sz, 1, 255)); +} + +static int +resp0_sock_getopt_maxttl(void *arg, void *buf, size_t *szp) +{ + resp0_sock *s = arg; + return (nni_getopt_int(s->ttl, buf, szp)); +} + +static void +resp0_sock_send(void *arg, nni_aio *aio) +{ + resp0_sock *s = arg; + nni_msg * msg; + int rv; + + nni_mtx_lock(&s->mtx); + if (s->raw) { + nni_mtx_unlock(&s->mtx); + nni_msgq_aio_put(s->uwq, aio); + return; + } + + msg = nni_aio_get_msg(aio); + + // If we have a stored backtrace, append it to the header... + // if we don't have a backtrace, discard the message. + if (s->btrace == NULL) { + nni_mtx_unlock(&s->mtx); + nni_aio_finish_error(aio, NNG_ESTATE); + return; + } + + // drop anything else in the header... + nni_msg_header_clear(msg); + + if ((rv = nni_msg_header_append(msg, s->btrace, s->btrace_len)) != 0) { + nni_mtx_unlock(&s->mtx); + nni_aio_finish_error(aio, rv); + return; + } + + nni_free(s->btrace, s->btrace_len); + s->btrace = NULL; + s->btrace_len = 0; + + nni_mtx_unlock(&s->mtx); + nni_msgq_aio_put(s->uwq, aio); +} + +static nni_msg * +resp0_sock_filter(void *arg, nni_msg *msg) +{ + resp0_sock *s = arg; + char * header; + size_t len; + + nni_mtx_lock(&s->mtx); + if (s->raw) { + nni_mtx_unlock(&s->mtx); + return (msg); + } + + len = nni_msg_header_len(msg); + header = nni_msg_header(msg); + if (s->btrace != NULL) { + nni_free(s->btrace, s->btrace_len); + s->btrace = NULL; + s->btrace_len = 0; + } + if ((s->btrace = nni_alloc(len)) == NULL) { + nni_mtx_unlock(&s->mtx); + nni_msg_free(msg); + return (NULL); + } + s->btrace_len = len; + memcpy(s->btrace, header, len); + nni_msg_header_clear(msg); + nni_mtx_unlock(&s->mtx); + return (msg); +} + +static void +resp0_sock_recv(void *arg, nni_aio *aio) +{ + resp0_sock *s = arg; + + nni_msgq_aio_get(s->urq, aio); +} + +static nni_proto_pipe_ops resp0_pipe_ops = { + .pipe_init = resp0_pipe_init, + .pipe_fini = resp0_pipe_fini, + .pipe_start = resp0_pipe_start, + .pipe_stop = resp0_pipe_stop, +}; + +static nni_proto_sock_option resp0_sock_options[] = { + { + .pso_name = NNG_OPT_RAW, + .pso_getopt = resp0_sock_getopt_raw, + .pso_setopt = resp0_sock_setopt_raw, + }, + { + .pso_name = NNG_OPT_MAXTTL, + .pso_getopt = resp0_sock_getopt_maxttl, + .pso_setopt = resp0_sock_setopt_maxttl, + }, + // terminate list + { NULL, NULL, NULL }, +}; + +static nni_proto_sock_ops resp0_sock_ops = { + .sock_init = resp0_sock_init, + .sock_fini = resp0_sock_fini, + .sock_open = resp0_sock_open, + .sock_close = resp0_sock_close, + .sock_filter = resp0_sock_filter, + .sock_send = resp0_sock_send, + .sock_recv = resp0_sock_recv, + .sock_options = resp0_sock_options, +}; + +static nni_proto resp0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_RESPONDENT_V0, "respondent" }, + .proto_peer = { NNI_PROTO_SURVEYOR_V0, "surveyor" }, + .proto_flags = NNI_PROTO_FLAG_SNDRCV, + .proto_sock_ops = &resp0_sock_ops, + .proto_pipe_ops = &resp0_pipe_ops, +}; + +int +nng_respondent0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &resp0_proto)); +} diff --git a/src/protocol/survey0/respond.h b/src/protocol/survey0/respond.h new file mode 100644 index 00000000..58c65298 --- /dev/null +++ b/src/protocol/survey0/respond.h @@ -0,0 +1,28 @@ +// +// 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. +// + +#ifndef NNG_PROTOCOL_SURVEY0_RESPOND_H +#define NNG_PROTOCOL_SURVEY0_RESPOND_H + +#ifdef __cplusplus +extern "C" { +#endif + +NNG_DECL int nng_respondent0_open(nng_socket *); + +#ifndef nng_respondent_open +#define nng_respondent_open nng_respondent0_open +#endif + +#ifdef __cplusplus +} +#endif + +#endif // NNG_PROTOCOL_SURVEY0_RESPOND_H diff --git a/src/protocol/survey0/survey.c b/src/protocol/survey0/survey.c new file mode 100644 index 00000000..02283436 --- /dev/null +++ b/src/protocol/survey0/survey.c @@ -0,0 +1,484 @@ +// +// 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" +#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 surv0_pipe surv0_pipe; +typedef struct surv0_sock surv0_sock; + +static void surv0_sock_getq_cb(void *); +static void surv0_getq_cb(void *); +static void surv0_putq_cb(void *); +static void surv0_send_cb(void *); +static void surv0_recv_cb(void *); +static void surv0_timeout(void *); + +// surv0_sock is our per-socket protocol private structure. +struct surv0_sock { + nni_duration survtime; + nni_time expire; + int raw; + int closing; + uint32_t nextid; // next id + uint32_t survid; // outstanding request ID (big endian) + nni_list pipes; + nni_aio * aio_getq; + nni_timer_node timer; + nni_msgq * uwq; + nni_msgq * urq; + nni_mtx mtx; +}; + +// surv0_pipe is our per-pipe protocol private structure. +struct surv0_pipe { + nni_pipe * npipe; + surv0_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 +surv0_sock_fini(void *arg) +{ + surv0_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 +surv0_sock_init(void **sp, nni_sock *nsock) +{ + surv0_sock *s; + int rv; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + if ((rv = nni_aio_init(&s->aio_getq, surv0_sock_getq_cb, s)) != 0) { + surv0_sock_fini(s); + return (rv); + } + NNI_LIST_INIT(&s->pipes, surv0_pipe, node); + nni_mtx_init(&s->mtx); + nni_timer_init(&s->timer, surv0_timeout, s); + + s->nextid = nni_random(); + s->raw = 0; + s->survtime = NNI_SECOND * 60; + s->expire = NNI_TIME_ZERO; + s->uwq = nni_sock_sendq(nsock); + s->urq = nni_sock_recvq(nsock); + + *sp = s; + return (0); +} + +static void +surv0_sock_open(void *arg) +{ + surv0_sock *s = arg; + + nni_msgq_aio_get(s->uwq, s->aio_getq); +} + +static void +surv0_sock_close(void *arg) +{ + surv0_sock *s = arg; + + nni_timer_cancel(&s->timer); + nni_aio_cancel(s->aio_getq, NNG_ECLOSED); +} + +static void +surv0_pipe_fini(void *arg) +{ + surv0_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 +surv0_pipe_init(void **pp, nni_pipe *npipe, void *s) +{ + surv0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + // This depth could be tunable. + if (((rv = nni_msgq_init(&p->sendq, 16)) != 0) || + ((rv = nni_aio_init(&p->aio_getq, surv0_getq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_putq, surv0_putq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_send, surv0_send_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_recv, surv0_recv_cb, p)) != 0)) { + surv0_pipe_fini(p); + return (rv); + } + + p->npipe = npipe; + p->psock = s; + *pp = p; + return (0); +} + +static int +surv0_pipe_start(void *arg) +{ + surv0_pipe *p = arg; + surv0_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 +surv0_pipe_stop(void *arg) +{ + surv0_pipe *p = arg; + surv0_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 +surv0_getq_cb(void *arg) +{ + surv0_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 +surv0_send_cb(void *arg) +{ + surv0_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->psock->uwq, p->aio_getq); +} + +static void +surv0_putq_cb(void *arg) +{ + surv0_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 +surv0_recv_cb(void *arg) +{ + surv0_pipe *p = arg; + nni_msg * msg; + + if (nni_aio_result(p->aio_recv) != 0) { + goto failed; + } + + 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) { + // Not enough data, just toss it. + nni_msg_free(msg); + goto failed; + } + if (nni_msg_header_append(msg, nni_msg_body(msg), 4) != 0) { + // Should be NNG_ENOMEM + nni_msg_free(msg); + goto failed; + } + (void) nni_msg_trim(msg, 4); + + nni_aio_set_msg(p->aio_putq, msg); + nni_msgq_aio_put(p->psock->urq, p->aio_putq); + return; + +failed: + nni_pipe_stop(p->npipe); +} + +static int +surv0_sock_setopt_raw(void *arg, const void *buf, size_t sz) +{ + surv0_sock *s = arg; + int rv; + + nni_mtx_lock(&s->mtx); + if ((rv = nni_setopt_int(&s->raw, buf, sz, 0, 1)) == 0) { + s->survid = 0; + nni_timer_cancel(&s->timer); + } + nni_mtx_unlock(&s->mtx); + return (rv); +} + +static int +surv0_sock_getopt_raw(void *arg, void *buf, size_t *szp) +{ + surv0_sock *s = arg; + return (nni_getopt_int(s->raw, buf, szp)); +} + +static int +surv0_sock_setopt_surveytime(void *arg, const void *buf, size_t sz) +{ + surv0_sock *s = arg; + return (nni_setopt_ms(&s->survtime, buf, sz)); +} + +static int +surv0_sock_getopt_surveytime(void *arg, void *buf, size_t *szp) +{ + surv0_sock *s = arg; + return (nni_getopt_ms(s->survtime, buf, szp)); +} + +static void +surv0_sock_getq_cb(void *arg) +{ + surv0_sock *s = arg; + surv0_pipe *p; + surv0_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_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 +surv0_timeout(void *arg) +{ + surv0_sock *s = arg; + + nni_mtx_lock(&s->mtx); + s->survid = 0; + nni_mtx_unlock(&s->mtx); + nni_msgq_set_get_error(s->urq, NNG_ETIMEDOUT); +} + +static void +surv0_sock_recv(void *arg, nni_aio *aio) +{ + surv0_sock *s = arg; + + nni_mtx_lock(&s->mtx); + if (s->survid == 0) { + nni_mtx_unlock(&s->mtx); + nni_aio_finish_error(aio, NNG_ESTATE); + return; + } + nni_mtx_unlock(&s->mtx); + nni_msgq_aio_get(s->urq, aio); +} + +static void +surv0_sock_send(void *arg, nni_aio *aio) +{ + surv0_sock *s = arg; + nni_msg * msg; + int rv; + + nni_mtx_lock(&s->mtx); + if (s->raw) { + // No automatic retry, and the request ID must + // be in the header coming down. + nni_mtx_unlock(&s->mtx); + nni_msgq_aio_put(s->uwq, aio); + return; + } + + // Generate a new request ID. We always set the high + // order bit so that the peer can locate the end of the + // backtrace. (Pipe IDs have the high order bit clear.) + s->survid = (s->nextid++) | 0x80000000u; + + msg = nni_aio_get_msg(aio); + nni_msg_header_clear(msg); + if ((rv = nni_msg_header_append_u32(msg, s->survid)) != 0) { + nni_mtx_unlock(&s->mtx); + nni_aio_finish_error(aio, rv); + return; + } + + // If another message is there, this cancels it. We move the + // survey expiration out. The timeout thread will wake up in + // the wake below, and reschedule itself appropriately. + s->expire = nni_clock() + s->survtime; + nni_timer_schedule(&s->timer, s->expire); + + nni_mtx_unlock(&s->mtx); + + nni_msgq_aio_put(s->uwq, aio); +} + +static nni_msg * +surv0_sock_filter(void *arg, nni_msg *msg) +{ + surv0_sock *s = arg; + + nni_mtx_lock(&s->mtx); + if (s->raw) { + // Pass it unmolested + nni_mtx_unlock(&s->mtx); + return (msg); + } + + if ((nni_msg_header_len(msg) < sizeof(uint32_t)) || + (nni_msg_header_trim_u32(msg) != s->survid)) { + // Wrong request id + nni_msg_free(msg); + return (NULL); + } + nni_mtx_unlock(&s->mtx); + + return (msg); +} + +static nni_proto_pipe_ops surv0_pipe_ops = { + .pipe_init = surv0_pipe_init, + .pipe_fini = surv0_pipe_fini, + .pipe_start = surv0_pipe_start, + .pipe_stop = surv0_pipe_stop, +}; + +static nni_proto_sock_option surv0_sock_options[] = { + { + .pso_name = NNG_OPT_RAW, + .pso_getopt = surv0_sock_getopt_raw, + .pso_setopt = surv0_sock_setopt_raw, + }, + { + .pso_name = NNG_OPT_SURVEYOR_SURVEYTIME, + .pso_getopt = surv0_sock_getopt_surveytime, + .pso_setopt = surv0_sock_setopt_surveytime, + }, + // terminate list + { NULL, NULL, NULL }, +}; + +static nni_proto_sock_ops surv0_sock_ops = { + .sock_init = surv0_sock_init, + .sock_fini = surv0_sock_fini, + .sock_open = surv0_sock_open, + .sock_close = surv0_sock_close, + .sock_send = surv0_sock_send, + .sock_recv = surv0_sock_recv, + .sock_filter = surv0_sock_filter, + .sock_options = surv0_sock_options, +}; + +static nni_proto surv0_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, + .proto_sock_ops = &surv0_sock_ops, + .proto_pipe_ops = &surv0_pipe_ops, +}; + +int +nng_surveyor0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &surv0_proto)); +} diff --git a/src/protocol/survey0/survey.h b/src/protocol/survey0/survey.h new file mode 100644 index 00000000..a7b6d943 --- /dev/null +++ b/src/protocol/survey0/survey.h @@ -0,0 +1,30 @@ +// +// 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. +// + +#ifndef NNG_PROTOCOL_SURVEY0_SURVEY_H +#define NNG_PROTOCOL_SURVEY0_SURVEY_H + +#ifdef __cplusplus +extern "C" { +#endif + +NNG_DECL int nng_surveyor0_open(nng_socket *); + +#ifndef nng_surveyor_open +#define nng_surveyor_open nng_surveyor0_open +#endif + +#define NNG_OPT_SURVEYOR_SURVEYTIME "surveyor:survey-time" + +#ifdef __cplusplus +} +#endif + +#endif // NNG_PROTOCOL_SURVEY0_SURVEY_H |