static void
ngx_http_push_stream_send_old_messages(ngx_http_request_t *r, ngx_http_push_stream_channel_t *channel, ngx_uint_t backtrack, time_t if_modified_since, ngx_int_t tag, time_t greater_message_time, ngx_int_t greater_message_tag, ngx_str_t *last_event_id)
{
ngx_http_push_stream_module_ctx_t *ctx = ngx_http_get_module_ctx(r, ngx_http_push_stream_module);
ngx_http_push_stream_msg_t *message;
ngx_queue_t *q;
if (ngx_http_push_stream_has_old_messages_to_send(channel, backtrack, if_modified_since, tag, greater_message_time, greater_message_tag, last_event_id)) {
if (backtrack > 0) {
ngx_uint_t qtd = (backtrack > channel->stored_messages) ? channel->stored_messages : backtrack;
ngx_uint_t start = channel->stored_messages - qtd;
ngx_shmtx_lock(channel->mutex);
// positioning at first message, and send the others
for (q = ngx_queue_head(&channel->message_queue); (qtd > 0) && q != ngx_queue_sentinel(&channel->message_queue); q = ngx_queue_next(q)) {
message = ngx_queue_data(q, ngx_http_push_stream_msg_t, queue);
if (message->deleted) {
break;
}
if (start == 0) {
qtd--;
ngx_http_push_stream_send_response_message(r, channel, message, 0, ctx->message_sent);
} else {
start--;
}
}
ngx_shmtx_unlock(channel->mutex);
} else if ((last_event_id != NULL) || (if_modified_since >= 0)) {
ngx_flag_t found = 0;
ngx_shmtx_lock(channel->mutex);
for (q = ngx_queue_head(&channel->message_queue); q != ngx_queue_sentinel(&channel->message_queue); q = ngx_queue_next(q)) {
message = ngx_queue_data(q, ngx_http_push_stream_msg_t, queue);
if (message->deleted) {
break;
}
if ((!found) && (last_event_id != NULL) && (message->event_id != NULL) && (ngx_memn2cmp(message->event_id->data, last_event_id->data, message->event_id->len, last_event_id->len) == 0)) {
found = 1;
continue;
}
if ((!found) && (if_modified_since >= 0) && ((message->time > if_modified_since) || ((message->time == if_modified_since) && (tag >= 0) && (message->tag >= tag)))) {
found = 1;
if ((message->time == if_modified_since) && (message->tag == tag)) {
continue;
}
}
if (found && (((greater_message_time == 0) && (greater_message_tag == -1)) || (greater_message_time > message->time) || ((greater_message_time == message->time) && (greater_message_tag >= message->tag)))) {
ngx_http_push_stream_send_response_message(r, channel, message, 0, ctx->message_sent);
}
}
ngx_shmtx_unlock(channel->mutex);
}
}
}
static void
ngx_http_push_stream_send_old_messages(ngx_http_request_t *r, ngx_http_push_stream_channel_t *channel, ngx_uint_t backtrack, time_t if_modified_since, ngx_int_t tag, time_t greater_message_time, ngx_int_t greater_message_tag, ngx_str_t *last_event_id)
{
ngx_http_push_stream_msg_t *message;
ngx_queue_t *cur;
if (ngx_http_push_stream_has_old_messages_to_send(channel, backtrack, if_modified_since, tag, greater_message_time, greater_message_tag, last_event_id)) {
cur = &channel->message_queue;
if (backtrack > 0) {
ngx_uint_t qtd = (backtrack > channel->stored_messages) ? channel->stored_messages : backtrack;
ngx_uint_t start = channel->stored_messages - qtd;
// positioning at first message, and send the others
while ((qtd > 0) && (cur = ngx_queue_next(cur)) && (cur != NULL) && (cur != &channel->message_queue)) {
message = (ngx_http_push_stream_msg_t *) ngx_queue_data(cur, ngx_http_push_stream_msg_t, queue);
if (message->deleted) {
break;
}
if (start == 0) {
ngx_http_push_stream_send_response_message(r, channel, message, 0, 1);
qtd--;
} else {
start--;
}
}
} else if ((last_event_id != NULL) || (if_modified_since >= 0)) {
ngx_flag_t found = 0;
while ((cur = ngx_queue_next(cur)) && (cur != NULL) && (cur != &channel->message_queue)) {
message = (ngx_http_push_stream_msg_t *) ngx_queue_data(cur, ngx_http_push_stream_msg_t, queue);
if (message->deleted) {
break;
}
if ((!found) && (last_event_id != NULL) && (message->event_id != NULL) && (ngx_memn2cmp(message->event_id->data, last_event_id->data, message->event_id->len, last_event_id->len) == 0)) {
found = 1;
continue;
}
if ((!found) && (last_event_id == NULL) && (if_modified_since >= 0) && ((message->time > if_modified_since) || ((message->time == if_modified_since) && (tag >= 0) && (message->tag >= tag)))) {
found = 1;
if ((message->time == if_modified_since) && (message->tag == tag)) {
continue;
}
}
if (found && (((greater_message_time == 0) && (greater_message_tag == -1)) || (greater_message_time > message->time) || ((greater_message_time == message->time) && (greater_message_tag >= message->tag)))) {
ngx_http_push_stream_send_response_message(r, channel, message, 0, 1);
}
}
}
}
}
static ngx_int_t
ngx_http_push_stream_respond_to_subscribers(ngx_http_push_stream_channel_t *channel, ngx_http_push_stream_queue_elem_t *subscribers_sentinel, ngx_http_push_stream_msg_t *msg)
{
ngx_http_push_stream_queue_elem_t *cur = subscribers_sentinel;
if (subscribers_sentinel == NULL) {
return NGX_ERROR;
}
if (msg != NULL) {
// now let's respond to some requests!
while ((cur = (ngx_http_push_stream_queue_elem_t *) ngx_queue_next(&cur->queue)) != subscribers_sentinel) {
ngx_http_push_stream_subscriber_t *subscriber = (ngx_http_push_stream_subscriber_t *) cur->value;
if (subscriber->longpolling) {
ngx_http_push_stream_queue_elem_t *prev = (ngx_http_push_stream_queue_elem_t *) ngx_queue_prev(&cur->queue);
ngx_http_push_stream_add_response_header(subscriber->request, &NGX_HTTP_PUSH_STREAM_HEADER_TRANSFER_ENCODING, &NGX_HTTP_PUSH_STREAM_HEADER_CHUNCKED);
ngx_http_push_stream_add_polling_headers(subscriber->request, msg->time, msg->tag, subscriber->request->pool);
ngx_http_send_header(subscriber->request);
//Adam Konrad: putting If-Modified-Since and etag to the response body
ngx_http_push_stream_send_http_time( subscriber->request, msg->time, msg->tag, subscriber->request->pool);
ngx_http_push_stream_send_response_content_header(subscriber->request, ngx_http_get_module_loc_conf(subscriber->request, ngx_http_push_stream_module));
ngx_http_push_stream_send_response_message(subscriber->request, channel, msg, 1, 0);
ngx_http_push_stream_send_response_finalize(subscriber->request);
cur = prev;
} else {
if (ngx_http_push_stream_send_response_message(subscriber->request, channel, msg, 0, 0) != NGX_OK) {
ngx_http_push_stream_queue_elem_t *prev = (ngx_http_push_stream_queue_elem_t *) ngx_queue_prev(&cur->queue);
ngx_http_push_stream_send_response_finalize(subscriber->request);
cur = prev;
} else {
ngx_http_push_stream_subscriber_ctx_t *ctx = ngx_http_get_module_ctx(subscriber->request, ngx_http_push_stream_module);
ngx_http_push_stream_loc_conf_t *pslcf = ngx_http_get_module_loc_conf(subscriber->request, ngx_http_push_stream_module);
ngx_http_push_stream_timer_reset(pslcf->ping_message_interval, ctx->ping_timer);
}
}
}
}
return NGX_OK;
}
static void
ngx_http_push_stream_send_old_messages(ngx_http_request_t *r, ngx_http_push_stream_channel_t *channel, ngx_uint_t backtrack, time_t if_modified_since, ngx_int_t tag, time_t greater_message_time, ngx_int_t greater_message_tag, ngx_str_t *last_event_id, ngx_int_t *message_count_had_send)
{
ngx_http_push_stream_msg_t *message;
ngx_queue_t *cur;
time_t next_greater_message_time = greater_message_time;//add by xinlu
ngx_int_t next_greater_message_tag = greater_message_tag;//add by xinlu
if (ngx_http_push_stream_has_old_messages_to_send(channel, backtrack, if_modified_since, tag, greater_message_time, greater_message_tag, last_event_id, &next_greater_message_time, &next_greater_message_tag) >= 2)
{
cur = &channel->message_queue;
if ((last_event_id != NULL) || (if_modified_since >= 0)) {
ngx_flag_t found = 0;
while ((cur = ngx_queue_next(cur)) && (cur != NULL) && (cur != &channel->message_queue)) {
message = (ngx_http_push_stream_msg_t *) ngx_queue_data(cur, ngx_http_push_stream_msg_t, queue);
if (message->deleted) {
break;
}
if ((!found) && (last_event_id != NULL) && (message->event_id != NULL) && (ngx_memn2cmp(message->event_id->data, last_event_id->data, message->event_id->len, last_event_id->len) == 0)) {
found = 1;
continue;
}
if ((!found) && (last_event_id == NULL) && (if_modified_since >= 0) && ((message->time > if_modified_since) || ((message->time == if_modified_since) && (tag >= 0) && (message->tag >= tag)))) {
found = 1;
if ((message->time == if_modified_since) && (message->tag == tag)) {
continue;
}
}
//if (found && (((greater_message_time == 0) && (greater_message_tag == -1)) || (greater_message_time > message->time) || ((greater_message_time == message->time) && (greater_message_tag >= message->tag))))
if (found && (greater_message_time == message->time) && (greater_message_tag == message->tag))
{
ngx_http_push_stream_send_response_message(r, channel, message, 0, 1);
(*message_count_had_send)++;
return;
}
}
}
}
}
