You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
302 lines
11 KiB
302 lines
11 KiB
/*
|
|
Copyright (c) 2013 Martin Sustrik All rights reserved.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"),
|
|
to deal in the Software without restriction, including without limitation
|
|
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
and/or sell copies of the Software, and to permit persons to whom
|
|
the Software is furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included
|
|
in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include "streamhdr.h"
|
|
|
|
#include "../../aio/timer.h"
|
|
|
|
#include "../../utils/err.h"
|
|
#include "../../utils/cont.h"
|
|
#include "../../utils/fast.h"
|
|
#include "../../utils/wire.h"
|
|
#include "../../utils/attr.h"
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
|
|
#define NN_STREAMHDR_STATE_IDLE 1
|
|
#define NN_STREAMHDR_STATE_SENDING 2
|
|
#define NN_STREAMHDR_STATE_RECEIVING 3
|
|
#define NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR 4
|
|
#define NN_STREAMHDR_STATE_STOPPING_TIMER_DONE 5
|
|
#define NN_STREAMHDR_STATE_DONE 6
|
|
#define NN_STREAMHDR_STATE_STOPPING 7
|
|
|
|
#define NN_STREAMHDR_SRC_USOCK 1
|
|
#define NN_STREAMHDR_SRC_TIMER 2
|
|
|
|
/* Private functions. */
|
|
static void nn_streamhdr_handler (struct nn_fsm *self, int src, int type,void *srcptr);
|
|
static void nn_streamhdr_shutdown (struct nn_fsm *self, int src, int type,void *srcptr);
|
|
|
|
void nn_streamhdr_init (struct nn_streamhdr *self, int src,struct nn_fsm *owner)
|
|
{
|
|
nn_fsm_init (&self->fsm, nn_streamhdr_handler, nn_streamhdr_shutdown,src, self, owner);
|
|
self->state = NN_STREAMHDR_STATE_IDLE;
|
|
nn_timer_init (&self->timer, NN_STREAMHDR_SRC_TIMER, &self->fsm);
|
|
nn_fsm_event_init (&self->done);
|
|
self->usock = NULL;
|
|
self->usock_owner.src = -1;
|
|
self->usock_owner.fsm = NULL;
|
|
self->pipebase = NULL;
|
|
}
|
|
|
|
void nn_streamhdr_term (struct nn_streamhdr *self)
|
|
{
|
|
nn_assert_state (self, NN_STREAMHDR_STATE_IDLE);
|
|
nn_fsm_event_term (&self->done);
|
|
nn_timer_term (&self->timer);
|
|
nn_fsm_term (&self->fsm);
|
|
}
|
|
|
|
int nn_streamhdr_isidle(struct nn_streamhdr *self)
|
|
{
|
|
return nn_fsm_isidle(&self->fsm);
|
|
}
|
|
|
|
void nn_streamhdr_start(struct nn_streamhdr *self,struct nn_usock *usock,struct nn_pipebase *pipebase)
|
|
{
|
|
size_t sz; int protocol;
|
|
/* Take ownership of the underlying socket. */
|
|
nn_assert (self->usock == NULL && self->usock_owner.fsm == NULL);
|
|
self->usock_owner.src = NN_STREAMHDR_SRC_USOCK;
|
|
self->usock_owner.fsm = &self->fsm;
|
|
nn_usock_swap_owner(usock,&self->usock_owner);
|
|
self->usock = usock;
|
|
self->pipebase = pipebase;
|
|
/* Get the protocol identifier. */
|
|
sz = sizeof (protocol);
|
|
nn_pipebase_getopt(pipebase,NN_SOL_SOCKET,NN_PROTOCOL,&protocol,&sz);
|
|
nn_assert (sz == sizeof (protocol));
|
|
/* Compose the protocol header. */
|
|
memcpy(self->protohdr,"\0SP\0\0\0\0\0",8);
|
|
nn_puts(self->protohdr + 4, (uint16_t)protocol);
|
|
/* Launch the state machine. */
|
|
nn_fsm_start (&self->fsm);
|
|
}
|
|
|
|
void nn_streamhdr_stop(struct nn_streamhdr *self)
|
|
{
|
|
nn_fsm_stop (&self->fsm);
|
|
}
|
|
|
|
static void nn_streamhdr_shutdown (struct nn_fsm *self, int src, int type,NN_UNUSED void *srcptr)
|
|
{
|
|
struct nn_streamhdr *streamhdr;
|
|
streamhdr = nn_cont (self, struct nn_streamhdr, fsm);
|
|
if (nn_slow (src == NN_FSM_ACTION && type == NN_FSM_STOP)) {
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING;
|
|
}
|
|
if (nn_slow (streamhdr->state == NN_STREAMHDR_STATE_STOPPING)) {
|
|
if (!nn_timer_isidle (&streamhdr->timer))
|
|
return;
|
|
streamhdr->state = NN_STREAMHDR_STATE_IDLE;
|
|
nn_fsm_stopped (&streamhdr->fsm, NN_STREAMHDR_STOPPED);
|
|
return;
|
|
}
|
|
|
|
nn_fsm_bad_state (streamhdr->state, src, type);
|
|
}
|
|
|
|
static void nn_streamhdr_handler (struct nn_fsm *self, int src, int type,NN_UNUSED void *srcptr)
|
|
{
|
|
struct nn_streamhdr *streamhdr;
|
|
struct nn_iovec iovec;
|
|
int protocol;
|
|
streamhdr = nn_cont (self, struct nn_streamhdr, fsm);
|
|
switch (streamhdr->state)
|
|
{
|
|
/******************************************************************************/
|
|
/* IDLE state. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_IDLE:
|
|
switch (src) {
|
|
|
|
case NN_FSM_ACTION:
|
|
switch (type) {
|
|
case NN_FSM_START:
|
|
nn_timer_start (&streamhdr->timer, 1000);
|
|
iovec.iov_base = streamhdr->protohdr;
|
|
iovec.iov_len = sizeof (streamhdr->protohdr);
|
|
nn_usock_send (streamhdr->usock, &iovec, 1);
|
|
streamhdr->state = NN_STREAMHDR_STATE_SENDING;
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
default:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
/* SENDING state. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_SENDING:
|
|
switch (src) {
|
|
|
|
case NN_STREAMHDR_SRC_USOCK:
|
|
switch (type) {
|
|
case NN_USOCK_SENT:
|
|
nn_usock_recv (streamhdr->usock, streamhdr->protohdr,sizeof (streamhdr->protohdr), NULL);
|
|
streamhdr->state = NN_STREAMHDR_STATE_RECEIVING;
|
|
return;
|
|
case NN_USOCK_SHUTDOWN:
|
|
/* Ignore it. Wait for ERROR event */
|
|
return;
|
|
case NN_USOCK_ERROR:
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR;
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
case NN_STREAMHDR_SRC_TIMER:
|
|
switch (type) {
|
|
case NN_TIMER_TIMEOUT:
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR;
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
default:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
/* RECEIVING state. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_RECEIVING:
|
|
switch (src) {
|
|
|
|
case NN_STREAMHDR_SRC_USOCK:
|
|
switch (type) {
|
|
case NN_USOCK_RECEIVED:
|
|
|
|
/* Here we are checking whether the peer speaks the same
|
|
protocol as this socket. */
|
|
if (memcmp (streamhdr->protohdr, "\0SP\0", 4) != 0)
|
|
goto invalidhdr;
|
|
protocol = nn_gets (streamhdr->protohdr + 4);
|
|
if ( !nn_pipebase_ispeer (streamhdr->pipebase, protocol))
|
|
goto invalidhdr;
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING_TIMER_DONE;
|
|
return;
|
|
case NN_USOCK_SHUTDOWN:
|
|
/* Ignore it. Wait for ERROR event */
|
|
return;
|
|
case NN_USOCK_ERROR:
|
|
invalidhdr:
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR;
|
|
return;
|
|
default:
|
|
nn_assert (0);
|
|
}
|
|
|
|
case NN_STREAMHDR_SRC_TIMER:
|
|
switch (type) {
|
|
case NN_TIMER_TIMEOUT:
|
|
nn_timer_stop (&streamhdr->timer);
|
|
streamhdr->state = NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR;
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
default:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
/* STOPPING_TIMER_ERROR state. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_STOPPING_TIMER_ERROR:
|
|
switch (src) {
|
|
|
|
case NN_STREAMHDR_SRC_USOCK:
|
|
/* It's safe to ignore usock event when we are stopping */
|
|
return;
|
|
|
|
case NN_STREAMHDR_SRC_TIMER:
|
|
switch (type) {
|
|
case NN_TIMER_STOPPED:
|
|
nn_usock_swap_owner (streamhdr->usock, &streamhdr->usock_owner);
|
|
streamhdr->usock = NULL;
|
|
streamhdr->usock_owner.src = -1;
|
|
streamhdr->usock_owner.fsm = NULL;
|
|
streamhdr->state = NN_STREAMHDR_STATE_DONE;
|
|
nn_fsm_raise (&streamhdr->fsm, &streamhdr->done,NN_STREAMHDR_ERROR);
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
default:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
/* STOPPING_TIMER_DONE state. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_STOPPING_TIMER_DONE:
|
|
switch (src) {
|
|
|
|
case NN_STREAMHDR_SRC_TIMER:
|
|
switch (type) {
|
|
case NN_TIMER_STOPPED:
|
|
nn_usock_swap_owner (streamhdr->usock, &streamhdr->usock_owner);
|
|
streamhdr->usock = NULL;
|
|
streamhdr->usock_owner.src = -1;
|
|
streamhdr->usock_owner.fsm = NULL;
|
|
streamhdr->state = NN_STREAMHDR_STATE_DONE;
|
|
nn_fsm_raise (&streamhdr->fsm, &streamhdr->done,NN_STREAMHDR_OK);
|
|
return;
|
|
default:
|
|
nn_fsm_bad_action (streamhdr->state, src, type);
|
|
}
|
|
|
|
default:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
/* DONE state. */
|
|
/* The header exchange was either done successfully of failed. There's */
|
|
/* nothing that can be done in this state except stopping the object. */
|
|
/******************************************************************************/
|
|
case NN_STREAMHDR_STATE_DONE:
|
|
nn_fsm_bad_source (streamhdr->state, src, type);
|
|
|
|
/******************************************************************************/
|
|
/* Invalid state. */
|
|
/******************************************************************************/
|
|
default:
|
|
nn_fsm_bad_state (streamhdr->state, src, type);
|
|
}
|
|
}
|
|
|
|
|