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-rw-r--r--src/protocol/reqrep0/rep.c705
1 files changed, 0 insertions, 705 deletions
diff --git a/src/protocol/reqrep0/rep.c b/src/protocol/reqrep0/rep.c
deleted file mode 100644
index aa32d249..00000000
--- a/src/protocol/reqrep0/rep.c
+++ /dev/null
@@ -1,705 +0,0 @@
-//
-// 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 <string.h>
-
-#include "core/nng_impl.h"
-#include "nng/protocol/reqrep0/rep.h"
-
-// Response protocol. The REP protocol is the "reply" side of a
-// request-reply pair. This is useful for building RPC servers, for
-// example.
-
-typedef struct rep0_pipe rep0_pipe;
-typedef struct rep0_sock rep0_sock;
-typedef struct rep0_ctx rep0_ctx;
-
-static void rep0_pipe_send_cb(void *);
-static void rep0_pipe_recv_cb(void *);
-static void rep0_pipe_fini(void *);
-
-struct rep0_ctx {
- rep0_sock * sock;
- uint32_t pipe_id;
- rep0_pipe * spipe; // send pipe
- nni_aio * saio; // send aio
- nni_aio * raio; // recv aio
- nni_list_node sqnode;
- nni_list_node rqnode;
- size_t btrace_len;
- uint32_t btrace[NNI_MAX_MAX_TTL + 1];
-};
-
-// rep0_sock is our per-socket protocol private structure.
-struct rep0_sock {
- nni_mtx lk;
- nni_atomic_int ttl;
- nni_id_map pipes;
- nni_list recvpipes; // list of pipes with data to receive
- nni_list recvq;
- rep0_ctx ctx;
- nni_pollable readable;
- nni_pollable writable;
-};
-
-// rep0_pipe is our per-pipe protocol private structure.
-struct rep0_pipe {
- nni_pipe * pipe;
- rep0_sock * rep;
- uint32_t id;
- nni_aio aio_send;
- nni_aio aio_recv;
- nni_list_node rnode; // receivable list linkage
- nni_list sendq; // contexts waiting to send
- bool busy;
- bool closed;
-};
-
-static void
-rep0_ctx_close(void *arg)
-{
- rep0_ctx * ctx = arg;
- rep0_sock *s = ctx->sock;
- nni_aio * aio;
-
- nni_mtx_lock(&s->lk);
- if ((aio = ctx->saio) != NULL) {
- rep0_pipe *pipe = ctx->spipe;
- ctx->saio = NULL;
- ctx->spipe = NULL;
- nni_list_remove(&pipe->sendq, ctx);
- nni_aio_finish_error(aio, NNG_ECLOSED);
- }
- if ((aio = ctx->raio) != NULL) {
- nni_list_remove(&s->recvq, ctx);
- ctx->raio = NULL;
- nni_aio_finish_error(aio, NNG_ECLOSED);
- }
- nni_mtx_unlock(&s->lk);
-}
-
-static void
-rep0_ctx_fini(void *arg)
-{
- rep0_ctx *ctx = arg;
-
- rep0_ctx_close(ctx);
-}
-
-static int
-rep0_ctx_init(void *carg, void *sarg)
-{
- rep0_sock *s = sarg;
- rep0_ctx * ctx = carg;
-
- NNI_LIST_NODE_INIT(&ctx->sqnode);
- NNI_LIST_NODE_INIT(&ctx->rqnode);
- ctx->btrace_len = 0;
- ctx->sock = s;
- ctx->pipe_id = 0;
-
- return (0);
-}
-
-static void
-rep0_ctx_cancel_send(nni_aio *aio, void *arg, int rv)
-{
- rep0_ctx * ctx = arg;
- rep0_sock *s = ctx->sock;
-
- nni_mtx_lock(&s->lk);
- if (ctx->saio != aio) {
- nni_mtx_unlock(&s->lk);
- return;
- }
- nni_list_node_remove(&ctx->sqnode);
- ctx->saio = NULL;
- nni_mtx_unlock(&s->lk);
-
- nni_msg_header_clear(nni_aio_get_msg(aio)); // reset the headers
- nni_aio_finish_error(aio, rv);
-}
-
-static void
-rep0_ctx_send(void *arg, nni_aio *aio)
-{
- rep0_ctx * ctx = arg;
- rep0_sock *s = ctx->sock;
- rep0_pipe *p;
- nni_msg * msg;
- int rv;
- size_t len;
- uint32_t p_id; // pipe id
-
- msg = nni_aio_get_msg(aio);
- nni_msg_header_clear(msg);
-
- if (nni_aio_begin(aio) != 0) {
- return;
- }
-
- nni_mtx_lock(&s->lk);
- len = ctx->btrace_len;
- p_id = ctx->pipe_id;
-
- // Assert "completion" of the previous req request. This ensures
- // exactly one send for one receive ordering.
- ctx->btrace_len = 0;
- ctx->pipe_id = 0;
-
- if (ctx == &s->ctx) {
- // No matter how this goes, we will no longer be able
- // to send on the socket (root context). That's because
- // we will have finished (successfully or otherwise) the
- // reply for the single request we got.
- nni_pollable_clear(&s->writable);
- }
- if (len == 0) {
- nni_mtx_unlock(&s->lk);
- nni_aio_finish_error(aio, NNG_ESTATE);
- return;
- }
- if ((rv = nni_msg_header_append(msg, ctx->btrace, len)) != 0) {
- nni_mtx_unlock(&s->lk);
- nni_aio_finish_error(aio, rv);
- return;
- }
- if ((p = nni_id_get(&s->pipes, p_id)) == NULL) {
- // Pipe is gone. Make this look like a good send to avoid
- // disrupting the state machine. We don't care if the peer
- // lost interest in our reply.
- nni_mtx_unlock(&s->lk);
- nni_aio_set_msg(aio, NULL);
- nni_aio_finish(aio, 0, nni_msg_len(msg));
- nni_msg_free(msg);
- return;
- }
- if (!p->busy) {
- p->busy = true;
- len = nni_msg_len(msg);
- nni_aio_set_msg(&p->aio_send, msg);
- nni_pipe_send(p->pipe, &p->aio_send);
- nni_mtx_unlock(&s->lk);
-
- nni_aio_set_msg(aio, NULL);
- nni_aio_finish(aio, 0, len);
- return;
- }
-
- if ((rv = nni_aio_schedule(aio, rep0_ctx_cancel_send, ctx)) != 0) {
- nni_mtx_unlock(&s->lk);
- nni_aio_finish_error(aio, rv);
- return;
- }
-
- ctx->saio = aio;
- ctx->spipe = p;
- nni_list_append(&p->sendq, ctx);
- nni_mtx_unlock(&s->lk);
-}
-
-static void
-rep0_sock_fini(void *arg)
-{
- rep0_sock *s = arg;
-
- nni_id_map_fini(&s->pipes);
- rep0_ctx_fini(&s->ctx);
- nni_pollable_fini(&s->writable);
- nni_pollable_fini(&s->readable);
- nni_mtx_fini(&s->lk);
-}
-
-static int
-rep0_sock_init(void *arg, nni_sock *sock)
-{
- rep0_sock *s = arg;
-
- NNI_ARG_UNUSED(sock);
-
- nni_mtx_init(&s->lk);
- nni_id_map_init(&s->pipes, 0, 0, false);
- NNI_LIST_INIT(&s->recvq, rep0_ctx, rqnode);
- NNI_LIST_INIT(&s->recvpipes, rep0_pipe, rnode);
- nni_atomic_init(&s->ttl);
- nni_atomic_set(&s->ttl, 8);
-
- (void) rep0_ctx_init(&s->ctx, s);
-
- // We start off without being either readable or writable.
- // Readability comes when there is something on the socket.
- nni_pollable_init(&s->writable);
- nni_pollable_init(&s->readable);
-
- return (0);
-}
-
-static void
-rep0_sock_open(void *arg)
-{
- NNI_ARG_UNUSED(arg);
-}
-
-static void
-rep0_sock_close(void *arg)
-{
- rep0_sock *s = arg;
-
- rep0_ctx_close(&s->ctx);
-}
-
-static void
-rep0_pipe_stop(void *arg)
-{
- rep0_pipe *p = arg;
-
- nni_aio_stop(&p->aio_send);
- nni_aio_stop(&p->aio_recv);
-}
-
-static void
-rep0_pipe_fini(void *arg)
-{
- rep0_pipe *p = arg;
- nng_msg * msg;
-
- if ((msg = nni_aio_get_msg(&p->aio_recv)) != NULL) {
- nni_aio_set_msg(&p->aio_recv, NULL);
- nni_msg_free(msg);
- }
-
- nni_aio_fini(&p->aio_send);
- nni_aio_fini(&p->aio_recv);
-}
-
-static int
-rep0_pipe_init(void *arg, nni_pipe *pipe, void *s)
-{
- rep0_pipe *p = arg;
-
- nni_aio_init(&p->aio_send, rep0_pipe_send_cb, p);
- nni_aio_init(&p->aio_recv, rep0_pipe_recv_cb, p);
-
- NNI_LIST_INIT(&p->sendq, rep0_ctx, sqnode);
-
- p->id = nni_pipe_id(pipe);
- p->pipe = pipe;
- p->rep = s;
- return (0);
-}
-
-static int
-rep0_pipe_start(void *arg)
-{
- rep0_pipe *p = arg;
- rep0_sock *s = p->rep;
- int rv;
-
- if (nni_pipe_peer(p->pipe) != NNG_REP0_PEER) {
- // Peer protocol mismatch.
- return (NNG_EPROTO);
- }
-
- nni_mtx_lock(&s->lk);
- rv = nni_id_set(&s->pipes, nni_pipe_id(p->pipe), p);
- nni_mtx_unlock(&s->lk);
- if (rv != 0) {
- return (rv);
- }
- // By definition, we have not received a request yet on this pipe,
- // so it cannot cause us to become writable.
- nni_pipe_recv(p->pipe, &p->aio_recv);
- return (0);
-}
-
-static void
-rep0_pipe_close(void *arg)
-{
- rep0_pipe *p = arg;
- rep0_sock *s = p->rep;
- rep0_ctx * ctx;
-
- nni_aio_close(&p->aio_send);
- nni_aio_close(&p->aio_recv);
-
- nni_mtx_lock(&s->lk);
- p->closed = true;
- if (nni_list_active(&s->recvpipes, p)) {
- // We are no longer "receivable".
- nni_list_remove(&s->recvpipes, p);
- }
- while ((ctx = nni_list_first(&p->sendq)) != NULL) {
- nni_aio *aio;
- nni_msg *msg;
- // Pipe was closed. To avoid pushing an error back to the
- // entire socket, we pretend we completed this successfully.
- nni_list_remove(&p->sendq, ctx);
- aio = ctx->saio;
- ctx->saio = NULL;
- msg = nni_aio_get_msg(aio);
- nni_aio_set_msg(aio, NULL);
- nni_aio_finish(aio, 0, nni_msg_len(msg));
- nni_msg_free(msg);
- }
- if (p->id == s->ctx.pipe_id) {
- // We "can" send. (Well, not really, but we will happily
- // accept a message and discard it.)
- nni_pollable_raise(&s->writable);
- }
- nni_id_remove(&s->pipes, nni_pipe_id(p->pipe));
- nni_mtx_unlock(&s->lk);
-}
-
-static void
-rep0_pipe_send_cb(void *arg)
-{
- rep0_pipe *p = arg;
- rep0_sock *s = p->rep;
- rep0_ctx * ctx;
- nni_aio * aio;
- nni_msg * msg;
- size_t len;
-
- 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->pipe);
- return;
- }
- nni_mtx_lock(&s->lk);
- p->busy = false;
- if ((ctx = nni_list_first(&p->sendq)) == NULL) {
- // Nothing else to send.
- if (p->id == s->ctx.pipe_id) {
- // Mark us ready for the other side to send!
- nni_pollable_raise(&s->writable);
- }
- nni_mtx_unlock(&s->lk);
- return;
- }
-
- nni_list_remove(&p->sendq, ctx);
- aio = ctx->saio;
- ctx->saio = NULL;
- ctx->spipe = NULL;
- p->busy = true;
- msg = nni_aio_get_msg(aio);
- len = nni_msg_len(msg);
- nni_aio_set_msg(aio, NULL);
- nni_aio_set_msg(&p->aio_send, msg);
- nni_pipe_send(p->pipe, &p->aio_send);
-
- nni_mtx_unlock(&s->lk);
-
- nni_aio_finish_sync(aio, 0, len);
-}
-
-static void
-rep0_cancel_recv(nni_aio *aio, void *arg, int rv)
-{
- rep0_ctx * ctx = arg;
- rep0_sock *s = ctx->sock;
-
- nni_mtx_lock(&s->lk);
- if (ctx->raio == aio) {
- nni_list_remove(&s->recvq, ctx);
- ctx->raio = NULL;
- nni_aio_finish_error(aio, rv);
- }
- nni_mtx_unlock(&s->lk);
-}
-
-static void
-rep0_ctx_recv(void *arg, nni_aio *aio)
-{
- rep0_ctx * ctx = arg;
- rep0_sock *s = ctx->sock;
- rep0_pipe *p;
- size_t len;
- nni_msg * msg;
-
- if (nni_aio_begin(aio) != 0) {
- return;
- }
- nni_mtx_lock(&s->lk);
- if ((p = nni_list_first(&s->recvpipes)) == NULL) {
- int rv;
- if ((rv = nni_aio_schedule(aio, rep0_cancel_recv, ctx)) != 0) {
- nni_mtx_unlock(&s->lk);
- nni_aio_finish_error(aio, rv);
- return;
- }
- if (ctx->raio != NULL) {
- // Cannot have a second receive operation pending.
- // This could be ESTATE, or we could cancel the first
- // with ECANCELED. We elect the former.
- nni_mtx_unlock(&s->lk);
- nni_aio_finish_error(aio, NNG_ESTATE);
- return;
- }
- ctx->raio = aio;
- nni_list_append(&s->recvq, ctx);
- nni_mtx_unlock(&s->lk);
- return;
- }
- msg = nni_aio_get_msg(&p->aio_recv);
- nni_aio_set_msg(&p->aio_recv, NULL);
- nni_list_remove(&s->recvpipes, p);
- if (nni_list_empty(&s->recvpipes)) {
- nni_pollable_clear(&s->readable);
- }
- nni_pipe_recv(p->pipe, &p->aio_recv);
- if ((ctx == &s->ctx) && !p->busy) {
- nni_pollable_raise(&s->writable);
- }
-
- len = nni_msg_header_len(msg);
- memcpy(ctx->btrace, nni_msg_header(msg), len);
- ctx->btrace_len = len;
- ctx->pipe_id = nni_pipe_id(p->pipe);
- nni_mtx_unlock(&s->lk);
-
- nni_msg_header_clear(msg);
- nni_aio_set_msg(aio, msg);
- nni_aio_finish(aio, 0, nni_msg_len(msg));
-}
-
-static void
-rep0_pipe_recv_cb(void *arg)
-{
- rep0_pipe *p = arg;
- rep0_sock *s = p->rep;
- rep0_ctx * ctx;
- nni_msg * msg;
- uint8_t * body;
- nni_aio * aio;
- size_t len;
- int hops;
- int ttl;
-
- if (nni_aio_result(&p->aio_recv) != 0) {
- nni_pipe_close(p->pipe);
- return;
- }
-
- msg = nni_aio_get_msg(&p->aio_recv);
- ttl = nni_atomic_get(&s->ttl);
-
- nni_msg_set_pipe(msg, p->id);
-
- // Move backtrace from body to header
- hops = 1;
- for (;;) {
- bool end;
-
- if (hops > ttl) {
- // This isn't malformed, but it has gone
- // through too many hops. Do not disconnect,
- // because we can legitimately receive messages
- // with too many hops from devices, etc.
- goto drop;
- }
- hops++;
- if (nni_msg_len(msg) < 4) {
- // Peer is speaking garbage. Kick it.
- nni_msg_free(msg);
- nni_aio_set_msg(&p->aio_recv, NULL);
- nni_pipe_close(p->pipe);
- return;
- }
- body = nni_msg_body(msg);
- end = ((body[0] & 0x80u) != 0);
- if (nni_msg_header_append(msg, body, 4) != 0) {
- // Out of memory, so drop it.
- goto drop;
- }
- nni_msg_trim(msg, 4);
- if (end) {
- break;
- }
- }
-
- len = nni_msg_header_len(msg);
-
- nni_mtx_lock(&s->lk);
-
- if (p->closed) {
- // If we are closed, then we can't return data.
- nni_aio_set_msg(&p->aio_recv, NULL);
- nni_mtx_unlock(&s->lk);
- nni_msg_free(msg);
- return;
- }
-
- if ((ctx = nni_list_first(&s->recvq)) == NULL) {
- // No one waiting to receive yet, holding pattern.
- nni_list_append(&s->recvpipes, p);
- nni_pollable_raise(&s->readable);
- nni_mtx_unlock(&s->lk);
- return;
- }
-
- nni_list_remove(&s->recvq, ctx);
- aio = ctx->raio;
- ctx->raio = NULL;
- nni_aio_set_msg(&p->aio_recv, NULL);
- if ((ctx == &s->ctx) && !p->busy) {
- nni_pollable_raise(&s->writable);
- }
-
- // schedule another receive
- nni_pipe_recv(p->pipe, &p->aio_recv);
-
- ctx->btrace_len = len;
- memcpy(ctx->btrace, nni_msg_header(msg), len);
- nni_msg_header_clear(msg);
- ctx->pipe_id = p->id;
-
- nni_mtx_unlock(&s->lk);
-
- nni_aio_set_msg(aio, msg);
- nni_aio_finish_sync(aio, 0, nni_msg_len(msg));
- return;
-
-drop:
- nni_msg_free(msg);
- nni_aio_set_msg(&p->aio_recv, NULL);
- nni_pipe_recv(p->pipe, &p->aio_recv);
-}
-
-static int
-rep0_sock_set_max_ttl(void *arg, const void *buf, size_t sz, nni_opt_type t)
-{
- rep0_sock *s = arg;
- int ttl;
- int rv;
-
- if ((rv = nni_copyin_int(&ttl, buf, sz, 1, NNI_MAX_MAX_TTL, t)) == 0) {
- nni_atomic_set(&s->ttl, ttl);
- }
- return (rv);
-}
-
-static int
-rep0_sock_get_max_ttl(void *arg, void *buf, size_t *szp, nni_opt_type t)
-{
- rep0_sock *s = arg;
-
- return (nni_copyout_int(nni_atomic_get(&s->ttl), buf, szp, t));
-}
-
-static int
-rep0_sock_get_sendfd(void *arg, void *buf, size_t *szp, nni_opt_type t)
-{
- rep0_sock *s = arg;
- int rv;
- int fd;
-
- if ((rv = nni_pollable_getfd(&s->writable, &fd)) != 0) {
- return (rv);
- }
- return (nni_copyout_int(fd, buf, szp, t));
-}
-
-static int
-rep0_sock_get_recvfd(void *arg, void *buf, size_t *szp, nni_opt_type t)
-{
- rep0_sock *s = arg;
- int rv;
- int fd;
-
- if ((rv = nni_pollable_getfd(&s->readable, &fd)) != 0) {
- return (rv);
- }
-
- return (nni_copyout_int(fd, buf, szp, t));
-}
-
-static void
-rep0_sock_send(void *arg, nni_aio *aio)
-{
- rep0_sock *s = arg;
-
- rep0_ctx_send(&s->ctx, aio);
-}
-
-static void
-rep0_sock_recv(void *arg, nni_aio *aio)
-{
- rep0_sock *s = arg;
-
- rep0_ctx_recv(&s->ctx, aio);
-}
-
-// This is the global protocol structure -- our linkage to the core.
-// This should be the only global non-static symbol in this file.
-static nni_proto_pipe_ops rep0_pipe_ops = {
- .pipe_size = sizeof(rep0_pipe),
- .pipe_init = rep0_pipe_init,
- .pipe_fini = rep0_pipe_fini,
- .pipe_start = rep0_pipe_start,
- .pipe_close = rep0_pipe_close,
- .pipe_stop = rep0_pipe_stop,
-};
-
-static nni_proto_ctx_ops rep0_ctx_ops = {
- .ctx_size = sizeof(rep0_ctx),
- .ctx_init = rep0_ctx_init,
- .ctx_fini = rep0_ctx_fini,
- .ctx_send = rep0_ctx_send,
- .ctx_recv = rep0_ctx_recv,
-};
-
-static nni_option rep0_sock_options[] = {
- {
- .o_name = NNG_OPT_MAXTTL,
- .o_get = rep0_sock_get_max_ttl,
- .o_set = rep0_sock_set_max_ttl,
- },
- {
- .o_name = NNG_OPT_RECVFD,
- .o_get = rep0_sock_get_recvfd,
- },
- {
- .o_name = NNG_OPT_SENDFD,
- .o_get = rep0_sock_get_sendfd,
- },
- // terminate list
- {
- .o_name = NULL,
- },
-};
-
-static nni_proto_sock_ops rep0_sock_ops = {
- .sock_size = sizeof(rep0_sock),
- .sock_init = rep0_sock_init,
- .sock_fini = rep0_sock_fini,
- .sock_open = rep0_sock_open,
- .sock_close = rep0_sock_close,
- .sock_options = rep0_sock_options,
- .sock_send = rep0_sock_send,
- .sock_recv = rep0_sock_recv,
-};
-
-static nni_proto rep0_proto = {
- .proto_version = NNI_PROTOCOL_VERSION,
- .proto_self = { NNG_REP0_SELF, NNG_REP0_SELF_NAME },
- .proto_peer = { NNG_REP0_PEER, NNG_REP0_PEER_NAME },
- .proto_flags = NNI_PROTO_FLAG_SNDRCV,
- .proto_sock_ops = &rep0_sock_ops,
- .proto_pipe_ops = &rep0_pipe_ops,
- .proto_ctx_ops = &rep0_ctx_ops,
-};
-
-int
-nng_rep0_open(nng_socket *sidp)
-{
- return (nni_proto_open(sidp, &rep0_proto));
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2026-01-18 14:15:30 +0000