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325 lines
11 KiB
325 lines
11 KiB
/*
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Copyright (c) 2012-2013 250bpm s.r.o. All rights reserved.
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Copyright (c) 2014 Wirebird Labs LLC. 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 "aws.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_AWS_STATE_IDLE 1
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#define NN_AWS_STATE_ACCEPTING 2
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#define NN_AWS_STATE_ACTIVE 3
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#define NN_AWS_STATE_STOPPING_SWS 4
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#define NN_AWS_STATE_STOPPING_USOCK 5
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#define NN_AWS_STATE_DONE 6
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#define NN_AWS_STATE_STOPPING_SWS_FINAL 7
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#define NN_AWS_STATE_STOPPING 8
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#define NN_AWS_SRC_USOCK 1
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#define NN_AWS_SRC_SWS 2
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#define NN_AWS_SRC_LISTENER 3
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/* Private functions. */
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static void nn_aws_handler (struct nn_fsm *self, int src, int type,
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void *srcptr);
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static void nn_aws_shutdown (struct nn_fsm *self, int src, int type,
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void *srcptr);
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void nn_aws_init (struct nn_aws *self, int src,
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struct nn_epbase *epbase, struct nn_fsm *owner)
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{
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nn_fsm_init (&self->fsm, nn_aws_handler, nn_aws_shutdown,
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src, self, owner);
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self->state = NN_AWS_STATE_IDLE;
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self->epbase = epbase;
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nn_usock_init (&self->usock, NN_AWS_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_sws_init (&self->sws, NN_AWS_SRC_SWS, 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_aws_term (struct nn_aws *self)
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{
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nn_assert_state (self, NN_AWS_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_sws_term (&self->sws);
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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_aws_isidle (struct nn_aws *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_aws_start (struct nn_aws *self, struct nn_usock *listener)
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{
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nn_assert_state (self, NN_AWS_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_AWS_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_aws_stop (struct nn_aws *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_aws_shutdown (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_aws *aws;
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aws = nn_cont (self, struct nn_aws, fsm);
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if (nn_slow (src == NN_FSM_ACTION && type == NN_FSM_STOP)) {
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if (!nn_sws_isidle (&aws->sws)) {
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nn_epbase_stat_increment (aws->epbase,
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NN_STAT_DROPPED_CONNECTIONS, 1);
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nn_sws_stop (&aws->sws);
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}
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aws->state = NN_AWS_STATE_STOPPING_SWS_FINAL;
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}
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if (nn_slow (aws->state == NN_AWS_STATE_STOPPING_SWS_FINAL)) {
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if (!nn_sws_isidle (&aws->sws))
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return;
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nn_usock_stop (&aws->usock);
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aws->state = NN_AWS_STATE_STOPPING;
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}
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if (nn_slow (aws->state == NN_AWS_STATE_STOPPING)) {
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if (!nn_usock_isidle (&aws->usock))
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return;
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if (aws->listener) {
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nn_assert (aws->listener_owner.fsm);
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nn_usock_swap_owner (aws->listener, &aws->listener_owner);
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aws->listener = NULL;
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aws->listener_owner.src = -1;
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aws->listener_owner.fsm = NULL;
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}
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aws->state = NN_AWS_STATE_IDLE;
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nn_fsm_stopped (&aws->fsm, NN_AWS_STOPPED);
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return;
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}
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nn_fsm_bad_action (aws->state, src, type);
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}
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static void nn_aws_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_aws *aws;
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int val;
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size_t sz;
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aws = nn_cont (self, struct nn_aws, fsm);
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switch (aws->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_AWS_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 (&aws->usock, aws->listener);
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aws->state = NN_AWS_STATE_ACCEPTING;
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return;
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default:
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nn_fsm_bad_action (aws->state, src, type);
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}
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default:
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nn_fsm_bad_source (aws->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_AWS_STATE_ACCEPTING:
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switch (src) {
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case NN_AWS_SRC_USOCK:
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switch (type) {
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case NN_USOCK_ACCEPTED:
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nn_epbase_clear_error (aws->epbase);
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/* Set the relevant socket options. */
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sz = sizeof (val);
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nn_epbase_getopt (aws->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 (&aws->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 (aws->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 (&aws->usock, SOL_SOCKET, SO_RCVBUF,
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&val, sizeof (val));
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/* Since the WebSocket handshake must poll, the receive
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timeout is set to zero. Later, it will be set again
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to the value specified by the socket option. */
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val = 0;
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sz = sizeof (val);
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nn_usock_setsockopt (&aws->usock, SOL_SOCKET, SO_RCVTIMEO,
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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 (aws->listener, &aws->listener_owner);
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aws->listener = NULL;
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aws->listener_owner.src = -1;
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aws->listener_owner.fsm = NULL;
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nn_fsm_raise (&aws->fsm, &aws->accepted, NN_AWS_ACCEPTED);
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/* Start the sws state machine. */
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nn_usock_activate (&aws->usock);
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nn_sws_start (&aws->sws, &aws->usock, NN_WS_SERVER,
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NULL, NULL);
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aws->state = NN_AWS_STATE_ACTIVE;
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nn_epbase_stat_increment (aws->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 (aws->state, src, type);
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}
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case NN_AWS_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 (aws->epbase,nn_usock_geterrno (aws->listener),__FILE__,__LINE__);
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nn_epbase_stat_increment (aws->epbase,
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NN_STAT_ACCEPT_ERRORS, 1);
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nn_usock_accept (&aws->usock, aws->listener);
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return;
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default:
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nn_fsm_bad_action (aws->state, src, type);
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}
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default:
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nn_fsm_bad_source (aws->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_AWS_STATE_ACTIVE:
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switch (src) {
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case NN_AWS_SRC_SWS:
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switch (type) {
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case NN_SWS_RETURN_CLOSE_HANDSHAKE:
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/* Peer closed connection without intention to reconnect, or
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local endpoint failed remote because of invalid data. */
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nn_sws_stop (&aws->sws);
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aws->state = NN_AWS_STATE_STOPPING_SWS;
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return;
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case NN_SWS_RETURN_ERROR:
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nn_sws_stop (&aws->sws);
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aws->state = NN_AWS_STATE_STOPPING_SWS;
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nn_epbase_stat_increment (aws->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 (aws->state, src, type);
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}
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default:
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nn_fsm_bad_source (aws->state, src, type);
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}
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/******************************************************************************/
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/* STOPPING_SWS state. */
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/******************************************************************************/
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case NN_AWS_STATE_STOPPING_SWS:
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switch (src) {
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case NN_AWS_SRC_SWS:
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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_SWS_RETURN_STOPPED:
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nn_usock_stop (&aws->usock);
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aws->state = NN_AWS_STATE_STOPPING_USOCK;
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return;
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default:
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nn_fsm_bad_action (aws->state, src, type);
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}
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default:
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nn_fsm_bad_source (aws->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_AWS_STATE_STOPPING_USOCK:
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switch (src) {
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case NN_AWS_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_aws_stop (aws);
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return;
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default:
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nn_fsm_bad_action (aws->state, src, type);
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}
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default:
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nn_fsm_bad_source (aws->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 (aws->state, src, type);
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}
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}
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