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stream.c
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stream.c
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/*
* Copyright (c) 2012, Toby Jaffey <toby@sensemote.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <common/common.h>
#include <common/logging.h>
#include <common/random.h>
#include "mqtthttpd.h"
#include "stream.h"
#include "streamlist.h"
#include "topic.h"
#include "sublist.h"
extern server_context_t g_srvctx;
stream_t *stream_create(const char *topic_patt_str)
{
stream_t *stream;
if (NULL == (stream = (stream_t *)calloc(sizeof(stream_t), 1)))
goto fail;
if (NULL == (stream->topic_patt = topic_create_from_string(topic_patt_str)))
goto fail;
if (NULL == (stream->rsp_q = tailq_create()))
goto fail;
if (NULL == (stream->topicstr = strdup(topic_patt_str)))
goto fail;
stream->timeoutS = DEFAULT_STREAM_TIMEOUT_S;
stream->streamid = g_srvctx.streamid++;
random_read(stream->seckey, STREAM_SECKEY_SIZE);
return stream;
fail:
stream_destroy(stream);
return NULL;
}
void stream_destroy(stream_t *stream)
{
if (NULL != stream)
{
while(!tailq_empty(stream->rsp_q))
free(tailq_pop_head(stream->rsp_q));
if (NULL != stream->topic_patt)
topic_destroy(stream->topic_patt);
if (stream->have_connid)
httpd_timeout_conn(stream->connid);
if (NULL != stream->topicstr)
free(stream->topicstr);
if (NULL != stream->rsp_q)
tailq_destroy(stream->rsp_q);
free(stream);
}
}
int stream_push(stream_t *stream, char *str)
{
char *s;
if (NULL == (s = strdup(str)))
return 1;
return tailq_push_tail(stream->rsp_q, s);
}
void stream_refresh_timer(stream_t *stream)
{
stream->timeoutS = DEFAULT_STREAM_TIMEOUT_S; // refresh timer
}
void stream_drain(stream_t *stream, stream_drain_func f, void *userdata)
{
bool first = true;
while(!tailq_empty(stream->rsp_q))
{
char *s;
s = (char *)tailq_pop_head(stream->rsp_q);
f(stream, s, first, userdata);
free(s);
first = false;
}
stream_refresh_timer(stream);
}
bool stream_isempty(stream_t *stream)
{
return tailq_empty(stream->rsp_q);
}
void stream_set_connection(stream_t *stream, uint32_t connid)
{
if (stream->have_connid)
LOG_DEBUG("stream hijacked, was connid=%u now %u", stream->connid, connid);
stream->connid = connid;
stream->have_connid = true;
}
bool stream_get_connection(stream_t *stream, uint32_t *connid)
{
if (stream->have_connid)
{
*connid = stream->connid;
return true;
}
return false;
}
void stream_clear_connection(stream_t *stream)
{
stream->have_connid = false;
}
bool stream_1hz(uint32_t streamid, stream_t *stream, void *userdata)
{
if (0 == stream->timeoutS--)
{
LOG_DEBUG("streamid=%u timeout", streamid);
if (sublist_remove(stream->topicstr))
{
LOG_INFO("unsubscribing from %s", stream->topicstr);
mqtt_unsubscribe(&g_srvctx.mqttctx, stream->topicstr, NULL);
}
return true;
}
return false;
}