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302 lines
11 KiB
302 lines
11 KiB
9 years ago
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/*
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Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom
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the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "atcp.h"
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#include "../../utils/err.h"
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#include "../../utils/cont.h"
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#include "../../utils/attr.h"
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#define NN_ATCP_STATE_IDLE 1
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#define NN_ATCP_STATE_ACCEPTING 2
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#define NN_ATCP_STATE_ACTIVE 3
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#define NN_ATCP_STATE_STOPPING_STCP 4
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#define NN_ATCP_STATE_STOPPING_USOCK 5
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#define NN_ATCP_STATE_DONE 6
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#define NN_ATCP_STATE_STOPPING_STCP_FINAL 7
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#define NN_ATCP_STATE_STOPPING 8
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#define NN_ATCP_SRC_USOCK 1
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#define NN_ATCP_SRC_STCP 2
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#define NN_ATCP_SRC_LISTENER 3
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/* Private functions. */
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static void nn_atcp_handler (struct nn_fsm *self, int src, int type,void *srcptr);
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static void nn_atcp_shutdown (struct nn_fsm *self, int src, int type,void *srcptr);
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void nn_atcp_init (struct nn_atcp *self, int src,struct nn_epbase *epbase, struct nn_fsm *owner)
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{
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nn_fsm_init(&self->fsm,nn_atcp_handler,nn_atcp_shutdown,src,self,owner);
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self->state = NN_ATCP_STATE_IDLE;
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self->epbase = epbase;
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nn_usock_init(&self->usock,NN_ATCP_SRC_USOCK,&self->fsm);
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self->listener = NULL;
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self->listener_owner.src = -1;
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self->listener_owner.fsm = NULL;
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nn_stcp_init(&self->stcp,NN_ATCP_SRC_STCP,epbase,&self->fsm);
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nn_fsm_event_init(&self->accepted);
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nn_fsm_event_init(&self->done);
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nn_list_item_init(&self->item);
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}
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void nn_atcp_term(struct nn_atcp *self)
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{
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nn_assert_state(self,NN_ATCP_STATE_IDLE);
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nn_list_item_term(&self->item);
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nn_fsm_event_term(&self->done);
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nn_fsm_event_term(&self->accepted);
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nn_stcp_term(&self->stcp);
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nn_usock_term(&self->usock);
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nn_fsm_term(&self->fsm);
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}
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int nn_atcp_isidle(struct nn_atcp *self)
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{
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return nn_fsm_isidle(&self->fsm);
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}
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void nn_atcp_start(struct nn_atcp *self,struct nn_usock *listener)
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{
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nn_assert_state (self, NN_ATCP_STATE_IDLE);
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/* Take ownership of the listener socket. */
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self->listener = listener;
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self->listener_owner.src = NN_ATCP_SRC_LISTENER;
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self->listener_owner.fsm = &self->fsm;
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nn_usock_swap_owner(listener, &self->listener_owner);
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/* Start the state machine. */
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nn_fsm_start (&self->fsm);
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}
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void nn_atcp_stop(struct nn_atcp *self)
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{
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nn_fsm_stop (&self->fsm);
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}
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static void nn_atcp_shutdown (struct nn_fsm *self, int src, int type,NN_UNUSED void *srcptr)
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{
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struct nn_atcp *atcp;
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atcp = nn_cont (self, struct nn_atcp, fsm);
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if (nn_slow (src == NN_FSM_ACTION && type == NN_FSM_STOP)) {
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if (!nn_stcp_isidle (&atcp->stcp)) {
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nn_epbase_stat_increment (atcp->epbase,NN_STAT_DROPPED_CONNECTIONS, 1);
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nn_stcp_stop (&atcp->stcp);
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}
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atcp->state = NN_ATCP_STATE_STOPPING_STCP_FINAL;
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}
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if (nn_slow (atcp->state == NN_ATCP_STATE_STOPPING_STCP_FINAL)) {
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if (!nn_stcp_isidle (&atcp->stcp))
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return;
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nn_usock_stop (&atcp->usock);
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atcp->state = NN_ATCP_STATE_STOPPING;
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}
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if (nn_slow (atcp->state == NN_ATCP_STATE_STOPPING)) {
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if (!nn_usock_isidle (&atcp->usock))
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return;
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if (atcp->listener) {
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nn_assert (atcp->listener_owner.fsm);
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nn_usock_swap_owner (atcp->listener, &atcp->listener_owner);
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atcp->listener = NULL;
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atcp->listener_owner.src = -1;
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atcp->listener_owner.fsm = NULL;
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}
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atcp->state = NN_ATCP_STATE_IDLE;
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nn_fsm_stopped (&atcp->fsm, NN_ATCP_STOPPED);
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return;
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}
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nn_fsm_bad_action(atcp->state, src, type);
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}
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static void nn_atcp_handler (struct nn_fsm *self, int src, int type,
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NN_UNUSED void *srcptr)
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{
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struct nn_atcp *atcp;
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int val;
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size_t sz;
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atcp = nn_cont (self, struct nn_atcp, fsm);
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switch (atcp->state) {
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/******************************************************************************/
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/* IDLE state. */
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/* The state machine wasn't yet started. */
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/******************************************************************************/
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case NN_ATCP_STATE_IDLE:
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switch (src) {
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case NN_FSM_ACTION:
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switch (type) {
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case NN_FSM_START:
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nn_usock_accept (&atcp->usock, atcp->listener);
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atcp->state = NN_ATCP_STATE_ACCEPTING;
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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default:
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nn_fsm_bad_source (atcp->state, src, type);
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}
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/******************************************************************************/
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/* ACCEPTING state. */
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/* Waiting for incoming connection. */
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/******************************************************************************/
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case NN_ATCP_STATE_ACCEPTING:
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switch (src) {
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case NN_ATCP_SRC_USOCK:
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switch (type) {
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case NN_USOCK_ACCEPTED:
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nn_epbase_clear_error (atcp->epbase);
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/* Set the relevant socket options. */
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sz = sizeof (val);
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nn_epbase_getopt (atcp->epbase, NN_SOL_SOCKET, NN_SNDBUF,
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&val, &sz);
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nn_assert (sz == sizeof (val));
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nn_usock_setsockopt (&atcp->usock, SOL_SOCKET, SO_SNDBUF,
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&val, sizeof (val));
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sz = sizeof (val);
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nn_epbase_getopt (atcp->epbase, NN_SOL_SOCKET, NN_RCVBUF,
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&val, &sz);
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nn_assert (sz == sizeof (val));
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nn_usock_setsockopt (&atcp->usock, SOL_SOCKET, SO_RCVBUF,
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&val, sizeof (val));
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/* Return ownership of the listening socket to the parent. */
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nn_usock_swap_owner (atcp->listener, &atcp->listener_owner);
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atcp->listener = NULL;
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atcp->listener_owner.src = -1;
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atcp->listener_owner.fsm = NULL;
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nn_fsm_raise (&atcp->fsm, &atcp->accepted, NN_ATCP_ACCEPTED);
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/* Start the stcp state machine. */
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nn_usock_activate (&atcp->usock);
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nn_stcp_start (&atcp->stcp, &atcp->usock);
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atcp->state = NN_ATCP_STATE_ACTIVE;
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nn_epbase_stat_increment (atcp->epbase,
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NN_STAT_ACCEPTED_CONNECTIONS, 1);
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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case NN_ATCP_SRC_LISTENER:
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switch (type) {
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case NN_USOCK_ACCEPT_ERROR:
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nn_epbase_set_error (atcp->epbase,nn_usock_geterrno(atcp->listener),__FILE__,__LINE__);
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nn_epbase_stat_increment (atcp->epbase,
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NN_STAT_ACCEPT_ERRORS, 1);
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nn_usock_accept (&atcp->usock, atcp->listener);
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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default:
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nn_fsm_bad_source (atcp->state, src, type);
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}
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/******************************************************************************/
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/* ACTIVE state. */
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/******************************************************************************/
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case NN_ATCP_STATE_ACTIVE:
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switch (src) {
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case NN_ATCP_SRC_STCP:
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switch (type) {
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case NN_STCP_ERROR:
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nn_stcp_stop (&atcp->stcp);
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atcp->state = NN_ATCP_STATE_STOPPING_STCP;
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nn_epbase_stat_increment (atcp->epbase,
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NN_STAT_BROKEN_CONNECTIONS, 1);
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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default:
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nn_fsm_bad_source (atcp->state, src, type);
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}
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/******************************************************************************/
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/* STOPPING_STCP state. */
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/******************************************************************************/
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case NN_ATCP_STATE_STOPPING_STCP:
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switch (src) {
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case NN_ATCP_SRC_STCP:
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switch (type) {
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case NN_USOCK_SHUTDOWN:
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return;
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case NN_STCP_STOPPED:
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nn_usock_stop (&atcp->usock);
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atcp->state = NN_ATCP_STATE_STOPPING_USOCK;
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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default:
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nn_fsm_bad_source (atcp->state, src, type);
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}
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/******************************************************************************/
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/* STOPPING_USOCK state. */
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/******************************************************************************/
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case NN_ATCP_STATE_STOPPING_USOCK:
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switch (src) {
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case NN_ATCP_SRC_USOCK:
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switch (type) {
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case NN_USOCK_SHUTDOWN:
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return;
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case NN_USOCK_STOPPED:
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nn_fsm_raise (&atcp->fsm, &atcp->done, NN_ATCP_ERROR);
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atcp->state = NN_ATCP_STATE_DONE;
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return;
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default:
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nn_fsm_bad_action (atcp->state, src, type);
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}
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default:
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nn_fsm_bad_source (atcp->state, src, type);
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}
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/******************************************************************************/
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/* Invalid state. */
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/******************************************************************************/
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default:
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nn_fsm_bad_state (atcp->state, src, type);
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}
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}
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