static ngx_int_t spool_respond_general(subscriber_pool_t *self, nchan_msg_t *msg, ngx_int_t code, void *code_data, unsigned notice) {
ngx_uint_t numsubs[SUBSCRIBER_TYPES];
spooled_subscriber_t *nsub, *nnext;
subscriber_t *sub;
//channel_spooler_t *spl = self->spooler;
//validate_spooler(spl, "before respond_general");
//nchan_msg_id_t unid;
//nchan_msg_id_t unprevid;
//int8_t i, max;
ngx_memzero(numsubs, sizeof(numsubs));
self->generation++;
DBG("spool %p (%V) (subs: %i) respond with msg %p or code %i", self, msgid_to_str(&self->id), self->sub_count, msg, code);
if(msg) {
DBG("msgid: %V", msgid_to_str(&msg->id));
DBG("prev: %V", msgid_to_str(&msg->prev_id));
}
/*
if(msg && msg->prev_id.time > 0 && msg->id.tagcount > 1) {
assert(msg->shared == 0);
max = msg->id.tagcount;
for(i=0; i< max; i++) {
unid.tag[i] = msg->id.tag[i];
unprevid.tag[i] = msg->prev_id.tag[i];
if(unid.tag[i] == -1) msg->id.tag[i] = self->id.tag[i];
if(unprevid.tag[i] == -1) msg->prev_id.tag[i] = self->id.tag[i];
}
}
*/
//uint8_t publish_events = self->spooler->publish_events;
for(nsub = self->first; nsub != NULL; nsub = nnext) {
sub = nsub->sub;
nnext = nsub->next;
if(msg) {
self->responded_count++;
sub->fn->respond_message(sub, msg);
}
else if(!notice) {
self->responded_count++;
sub->fn->respond_status(sub, code, code_data);
}
else {
sub->fn->notify(sub, code, code_data);
}
}
if(!notice && code != NGX_HTTP_NO_CONTENT) self->responded_count++;
//assert(validate_spooler(spl, "after respond_general"));
return NGX_OK;
}
ngx_int_t nchan_set_msgid_http_response_headers(ngx_http_request_t *r, nchan_request_ctx_t *ctx, nchan_msg_id_t *msgid) {
ngx_str_t *etag, *tmp_etag;
nchan_loc_conf_t *cf = ngx_http_get_module_loc_conf(r, ngx_nchan_module);
int8_t output_etag = 1, cross_origin;
if(!ctx) {
ctx = ngx_http_get_module_ctx(r, ngx_nchan_module);
}
cross_origin = ctx && ctx->request_origin_header.data;
if(!cf->msg_in_etag_only) {
//last-modified
if(msgid->time > 0) {
r->headers_out.last_modified_time = msgid->time;
}
else {
output_etag = 0;
}
tmp_etag = msgtag_to_str(msgid);
}
else {
tmp_etag = msgid_to_str(msgid);
}
if((etag = ngx_palloc(r->pool, sizeof(*etag) + tmp_etag->len))==NULL) {
return NGX_ERROR;
}
etag->data = (u_char *)(etag+1);
etag->len = tmp_etag->len;
ngx_memcpy(etag->data, tmp_etag->data, tmp_etag->len);
if(cf->custom_msgtag_header.len == 0) {
if(output_etag) {
nchan_add_response_header(r, &NCHAN_HEADER_ETAG, etag);
}
if(cross_origin) {
nchan_add_response_header(r, &NCHAN_HEADER_ACCESS_CONTROL_EXPOSE_HEADERS, &NCHAN_MSG_RESPONSE_ALLOWED_HEADERS);
}
}
else {
if(output_etag) {
nchan_add_response_header(r, &cf->custom_msgtag_header, etag);
}
if(cross_origin) {
u_char *cur = ngx_palloc(r->pool, 255);
if(cur == NULL) {
return NGX_ERROR;
}
ngx_str_t allowed;
allowed.data = cur;
cur = ngx_snprintf(cur, 255, NCHAN_MSG_RESPONSE_ALLOWED_CUSTOM_ETAG_HEADERS_STRF, &cf->custom_msgtag_header);
allowed.len = cur - allowed.data;
nchan_add_response_header(r, &NCHAN_HEADER_ACCESS_CONTROL_EXPOSE_HEADERS, &allowed);
}
}
//Vary header needed for proper HTTP caching.
nchan_add_response_header(r, &NCHAN_HEADER_VARY, &NCHAN_VARY_HEADER_VALUE);
return NGX_OK;
}
static ngx_int_t spooler_respond_message(channel_spooler_t *self, nchan_msg_t *msg) {
spooler_respond_data_t srdata;
subscriber_pool_t *spool;
ngx_int_t responded_subs = 0;
srdata.min = msg->prev_id;
srdata.max = msg->id;
srdata.multi = msg->id.tagcount;
srdata.overflow = NULL;
srdata.msg = msg;
srdata.n = 0;
//find all spools between msg->prev_id and msg->id
rbtree_conditional_walk(&self->spoolseed, (rbtree_walk_conditional_callback_pt )collect_spool_range_callback, &srdata);
if(srdata.n == 0) {
DBG("no spools in range %V -- ", msgid_to_str(&msg->prev_id));
DBG(" -- %V", msgid_to_str(&msg->id));
}
while((spool = spoolcollector_unwind_nextspool(&srdata)) != NULL) {
responded_subs += spool->sub_count;
if(msg->id.tagcount > NCHAN_FIXED_MULTITAG_MAX) {
assert(spool->id.tag.allocd != msg->id.tag.allocd);
}
spool_respond_general(spool, msg, 0, NULL, 0);
if(msg->id.tagcount > NCHAN_FIXED_MULTITAG_MAX) {
assert(spool->id.tag.allocd != msg->id.tag.allocd);
}
spool_nextmsg(spool, &msg->id);
}
spool = get_spool(self, &latest_msg_id);
if(spool->sub_count > 0) {
#if NCHAN_BENCHMARK
responded_subs += spool->sub_count;
#endif
spool_respond_general(spool, msg, 0, NULL, 0);
spool_nextmsg(spool, &msg->id);
}
nchan_copy_msg_id(&self->prev_msg_id, &msg->id, NULL);
#if NCHAN_BENCHMARK
self->last_responded_subscriber_count = responded_subs;
#endif
return NGX_OK;
}
ngx_str_t nchan_subscriber_set_recyclable_msgid_str(nchan_request_ctx_t *ctx, nchan_msg_id_t *msgid) {
ngx_str_t ret;
msgidbuf_t *msgidbuf;
msgidbuf = nchan_reuse_queue_push(ctx->output_str_queue);
ret.data = &msgidbuf->chr[0];
nchan_strcpy(&ret, msgid_to_str(msgid), MSGID_BUF_LEN);
return ret;
}
static ngx_int_t spool_fetch_msg(subscriber_pool_t *spool) {
fetchmsg_data_t *data;
channel_spooler_t *spl = spool->spooler;
if(*spl->channel_status != READY) {
DBG("%p wanted to fetch msg %V, but channel %V not ready", spool, msgid_to_str(&spool->id), spl->chid);
spool->msg_status = MSG_CHANNEL_NOTREADY;
return NGX_DECLINED;
}
DBG("%p fetch msg %V for channel %V", spool, msgid_to_str(&spool->id), spl->chid);
data = ngx_alloc(sizeof(*data), ngx_cycle->log); //correctness over efficiency (at first).
//TODO: optimize this alloc away
assert(data);
data->next = spl->fetchmsg_cb_data_list;
if(data->next) {
data->next->prev = data;
}
spl->fetchmsg_cb_data_list = data;
data->prev = NULL;
nchan_copy_new_msg_id(&data->msgid, &spool->id);
data->spooler = spool->spooler;
assert(spool->msg == NULL);
assert(spool->msg_status == MSG_INVALID);
spool->msg_status = MSG_PENDING;
if(spl->handlers->get_message_start) {
spl->handlers->get_message_start(spl, spl->handlers_privdata);
}
switch(spl->fetching_strategy) {
case FETCH:
case FETCH_IGNORE_MSG_NOTFOUND:
spool->spooler->store->get_message(spool->spooler->chid, &spool->id, spool->spooler->cf, (callback_pt )spool_fetch_msg_callback, data);
break;
case NO_FETCH:
//do nothing
break;
}
return NGX_OK;
}
static ngx_int_t nchan_message_id_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) {
static u_char msgidbuf[100];
ngx_str_t *msgid;
nchan_request_ctx_t *ctx = get_main_request_ctx(r);
if(ctx == NULL || (ctx->msg_id.time == 0 && ctx->msg_id.tagcount == 0)) {
v->not_found = 1;
return NGX_OK;
}
msgid = msgid_to_str(&ctx->msg_id);
ngx_memcpy(msgidbuf, msgid->data, msgid->len);
set_varval(v, msgidbuf, msgid->len);
return NGX_OK;
}
static subscriber_pool_t *get_spool(channel_spooler_t *spl, nchan_msg_id_t *id) {
rbtree_seed_t *seed = &spl->spoolseed;
ngx_rbtree_node_t *node;
subscriber_pool_t *spool;
if(id->time == NCHAN_NEWEST_MSGID_TIME) {
spool = &spl->current_msg_spool;
spool->msg_status = MSG_EXPECTED;
return &spl->current_msg_spool;
}
if((node = rbtree_find_node(seed, id)) == NULL) {
if((node = rbtree_create_node(seed, sizeof(*spool))) == NULL) {
ERR("can't create rbtree node for spool");
return NULL;
}
// DBG("CREATED spool node %p for msgid %V", node, msgid_to_str(id));
spool = (subscriber_pool_t *)rbtree_data_from_node(node);
init_spool(spl, spool, id);
if(rbtree_insert_node(seed, node) != NGX_OK) {
ERR("couldn't insert spool node");
rbtree_destroy_node(seed, node);
return NULL;
}
}
else {
spool = (subscriber_pool_t *)rbtree_data_from_node(node);
DBG("found spool node %p with msgid %V", node, msgid_to_str(id));
assert(spool->id.time == id->time);
}
return spool;
}
static ngx_int_t multipart_respond_message(subscriber_t *sub, nchan_msg_t *msg) {
full_subscriber_t *fsub = (full_subscriber_t *)sub;
ngx_buf_t *buf, *msg_buf = msg->buf, *msgid_buf;
ngx_int_t rc;
nchan_loc_conf_t *cf = ngx_http_get_module_loc_conf(fsub->sub.request, nchan_module);
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(fsub->sub.request, nchan_module);
ngx_int_t n;
nchan_buf_and_chain_t *bc;
ngx_chain_t *chain;
ngx_file_t *file_copy;
multipart_privdata_t *mpd = (multipart_privdata_t *)fsub->privdata;
headerbuf_t *headerbuf = nchan_reuse_queue_push(ctx->output_str_queue);
u_char *cur = headerbuf->charbuf;
if(fsub->data.timeout_ev.timer_set) {
ngx_del_timer(&fsub->data.timeout_ev);
ngx_add_timer(&fsub->data.timeout_ev, sub->cf->subscriber_timeout * 1000);
}
//generate the headers
if(!cf->msg_in_etag_only) {
//msgtime
cur = ngx_cpymem(cur, "\r\nLast-Modified: ", sizeof("\r\nLast-Modified: ") - 1);
cur = ngx_http_time(cur, msg->id.time);
*cur++ = CR; *cur++ = LF;
//msgtag
cur = ngx_cpymem(cur, "Etag: ", sizeof("Etag: ") - 1);
cur += msgtag_to_strptr(&msg->id, (char *)cur);
*cur++ = CR; *cur++ = LF;
}
else {
ngx_str_t *tmp_etag = msgid_to_str(&msg->id);
cur = ngx_snprintf(cur, 58 + 10*NCHAN_FIXED_MULTITAG_MAX, "\r\nEtag: %V\r\n", tmp_etag);
}
n=4;
if(msg->content_type.len == 0) {
//don't need content_type buf'n'chain
n--;
}
if(ngx_buf_size(msg_buf) == 0) {
//don't need msgbuf
n --;
}
if((bc = nchan_bufchain_pool_reserve(ctx->bcp, n)) == NULL) {
ERR("cant allocate buf-and-chains for multipart/mixed client output");
return NGX_ERROR;
}
chain = &bc->chain;
msgid_buf = chain->buf;
//message id
ngx_memzero(chain->buf, sizeof(ngx_buf_t));
chain->buf->memory = 1;
chain->buf->start = headerbuf->charbuf;
chain->buf->pos = headerbuf->charbuf;
//content_type maybe
if(msg->content_type.len > 0) {
chain = chain->next;
buf = chain->buf;
msgid_buf->last = cur;
msgid_buf->end = cur;
ngx_memzero(buf, sizeof(ngx_buf_t));
buf->memory = 1;
buf->start = cur;
buf->pos = cur;
buf->last = ngx_snprintf(cur, 255, "Content-Type: %V\r\n\r\n", &msg->content_type);
buf->end = buf->last;
}
else {
*cur++ = CR; *cur++ = LF;
msgid_buf->last = cur;
msgid_buf->end = cur;
}
chain = chain->next;
buf = chain->buf;
//msgbuf
if(ngx_buf_size(msg_buf) > 0) {
ngx_memcpy(buf, msg_buf, sizeof(*msg_buf));
if(msg_buf->file) {
file_copy = nchan_bufchain_pool_reserve_file(ctx->bcp);
nchan_msg_buf_open_fd_if_needed(buf, file_copy, NULL);
}
buf->last_buf = 0;
buf->last_in_chain = 0;
buf->flush = 0;
}
chain = chain->next;
buf = chain->buf;
ngx_memzero(buf, sizeof(ngx_buf_t));
buf->start = &mpd->boundary[0];
buf->pos = buf->start;
buf->end = mpd->boundary_end;
buf->last = buf->end;
buf->memory = 1;
buf->last_buf = 0;
buf->last_in_chain = 1;
buf->flush = 1;
ctx->prev_msg_id = fsub->sub.last_msgid;
update_subscriber_last_msg_id(sub, msg);
ctx->msg_id = fsub->sub.last_msgid;
multipart_ensure_headers_sent(fsub);
DBG("%p output msg to subscriber", sub);
rc = nchan_output_msg_filter(fsub->sub.request, msg, &bc->chain);
return rc;
}
static ngx_int_t sub_respond_message(ngx_int_t status, nchan_msg_t *msg, sub_data_t* d) {
nchan_msg_copy_t remsg;
//nchan_msg_id_t *last_msgid;
ngx_int_t mcount;
int16_t tags[NCHAN_MULTITAG_MAX], prevtags[NCHAN_MULTITAG_MAX];
//remsg = ngx_alloc(sizeof(*remsg), ngx_cycle->log);
//assert(remsg);
assert( msg->id.tagcount == 1 );
assert( msg->prev_id.tagcount == 1 );
remsg.original = msg;
remsg.copy = *msg;
remsg.copy.shared = 0;
remsg.copy.temp_allocd = 0;
mcount = d->multi_chanhead->multi_count;
remsg.copy.prev_id.tagcount = mcount;
remsg.copy.prev_id.tagactive = d->n;
remsg.copy.id.tagcount = mcount;
remsg.copy.id.tagactive = d->n;
if(mcount > NCHAN_FIXED_MULTITAG_MAX) {
remsg.copy.id.tag.allocd = tags;
tags[0]=msg->id.tag.fixed[0];
remsg.copy.prev_id.tag.allocd = prevtags;
prevtags[0]=msg->prev_id.tag.fixed[0];
}
nchan_expand_msg_id_multi_tag(&remsg.copy.prev_id, 0, d->n, -1);
nchan_expand_msg_id_multi_tag(&remsg.copy.id, 0, d->n, -1);
memstore_ensure_chanhead_is_ready(d->multi_chanhead, 1);
DBG("%p respond with transformed message %p %V (%p %V %i) %V", d->multi->sub, &remsg.copy, msgid_to_str(&remsg.copy.id), d->multi_chanhead, &d->multi_chanhead->id, d->n, &d->multi->id);
nchan_memstore_publish_generic(d->multi_chanhead, &remsg.copy, 0, NULL);
return NGX_OK;
}
static ngx_int_t es_respond_message(subscriber_t *sub, nchan_msg_t *msg) {
static ngx_str_t terminal_newlines=ngx_string("\n\n");
full_subscriber_t *fsub = (full_subscriber_t *)sub;
u_char *cur = NULL, *last = NULL;
ngx_buf_t *msg_buf = msg->buf;
ngx_buf_t databuf;
ngx_pool_t *pool;
nchan_buf_and_chain_t *bc;
size_t len;
ngx_chain_t *first_link = NULL, *last_link = NULL;
ngx_file_t *msg_file;
ngx_int_t rc;
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(fsub->sub.request, nchan_module);
ctx->prev_msg_id = fsub->sub.last_msgid;
update_subscriber_last_msg_id(sub, msg);
ctx->msg_id = fsub->sub.last_msgid;
es_ensure_headers_sent(fsub);
DBG("%p output msg to subscriber", sub);
pool = ngx_create_pool(NGX_DEFAULT_LINEBREAK_POOL_SIZE, ngx_cycle->log);
assert(pool);
ngx_memcpy(&databuf, msg_buf, sizeof(*msg_buf));
databuf.last_buf = 0;
if(!databuf.in_file) {
cur = msg_buf->start;
last = msg_buf->end;
do {
databuf.start = cur;
databuf.pos = cur;
databuf.end = last;
databuf.last = last;
cur = ngx_strlchr(cur, last, '\n');
if(cur == NULL) {
//sweet, no newlines!
//let's get out of this hellish loop
databuf.end = last;
databuf.last = last;
cur = last + 1;
}
else {
cur++; //include the newline
databuf.end = cur;
databuf.last = cur;
}
create_dataline_bufchain(pool, &first_link, &last_link, &databuf);
} while(cur <= last);
}
else {
//great, we've gotta scan this whole damn file for line breaks.
//EventStream really isn't designed for large chunks of data
off_t fcur, flast;
ngx_fd_t fd;
int chr_int;
FILE *stream;
msg_file = ngx_palloc(pool, sizeof(*msg_file));
databuf.file = msg_file;
ngx_memcpy(msg_file, msg_buf->file, sizeof(*msg_file));
if(msg_file->fd == NGX_INVALID_FILE) {
msg_file->fd = nchan_fdcache_get(&msg_file->name);
}
fd = msg_file->fd;
stream = fdopen(dup(fd), "r");
fcur = databuf.file_pos;
flast = databuf.file_last;
fseek(stream, fcur, SEEK_SET);
do {
databuf.file_pos = fcur;
databuf.file_last = flast;
//getc that shit
for(;;) {
chr_int = getc(stream);
if(chr_int == EOF) {
break;
}
else if(chr_int == (int )'\n') {
fcur++;
break;
}
fcur++;
}
databuf.file_last = fcur;
create_dataline_bufchain(pool, &first_link, &last_link, &databuf);
} while(fcur < flast);
fclose(stream);
}
//now 2 newlines at the end
if(last_link) {
bc = ngx_palloc(pool, sizeof(*bc));
last_link->next=&bc->chain;
ngx_init_set_membuf(&bc->buf, terminal_newlines.data, terminal_newlines.data + terminal_newlines.len);
bc->buf.flush = 1;
bc->buf.last_buf = 0;
bc->chain.next = NULL;
bc->chain.buf = &bc->buf;
last_link = &bc->chain;
}
//okay, this crazy data chain is finished. now how about the mesage tag?
len = 10 + 2*NGX_INT_T_LEN;
bc = ngx_palloc(pool, sizeof(*bc) + len);
ngx_memzero(&bc->buf, sizeof(bc->buf));
cur = (u_char *)&bc[1];
ngx_init_set_membuf(&bc->buf, cur, ngx_snprintf(cur, len, "id: %V\n", msgid_to_str(&sub->last_msgid)));
bc->chain.buf = &bc->buf;
bc->chain.next = first_link;
first_link=&bc->chain;
rc = nchan_output_filter(fsub->sub.request, first_link);
ngx_destroy_pool(pool);
return rc;
}
static ngx_int_t spool_fetch_msg_callback(nchan_msg_status_t findmsg_status, nchan_msg_t *msg, fetchmsg_data_t *data) {
nchan_msg_status_t prev_status;
subscriber_pool_t *spool, *nuspool;
channel_spooler_t *spl = data->spooler;
int free_msg_id = 1;
if(spl && data == spl->fetchmsg_cb_data_list) {
spl->fetchmsg_cb_data_list = data->next;
}
if(data->next) {
data->next->prev = data->prev;
}
if(data->prev) {
data->prev->next = data->next;
}
if(spl == NULL) { //channel already deleted
nchan_free_msg_id(&data->msgid);
ngx_free(data);
return NGX_OK;
}
if(spl->handlers->get_message_finish) {
spl->handlers->get_message_finish(spl, spl->handlers_privdata);
}
if((spool = find_spool(spl, &data->msgid)) == NULL) {
DBG("spool for msgid %V not found. discarding getmsg callback response.", msgid_to_str(&data->msgid));
nchan_free_msg_id(&data->msgid);
ngx_free(data);
return NGX_ERROR;
}
prev_status = spool->msg_status;
switch(findmsg_status) {
case MSG_FOUND:
spool->msg_status = findmsg_status;
DBG("fetchmsg callback for spool %p msg FOUND %p %V", spool, msg, msgid_to_str(&msg->id));
assert(msg != NULL);
spool->msg = msg;
spool_respond_general(spool, spool->msg, 0, NULL, 0);
spool_nextmsg(spool, &msg->id);
break;
case MSG_EXPECTED:
// ♫ It's gonna be the future soon ♫
if(spool->id.time == NCHAN_NTH_MSGID_TIME) {
//wait for message in the NEWEST_ID spool
nchan_msg_id_t newest_id = NCHAN_NEWEST_MSGID;
spool_nextmsg(spool, &newest_id);
}
else {
spool->msg_status = findmsg_status;
DBG("fetchmsg callback for spool %p msg EXPECTED", spool);
spool_respond_general(spool, NULL, NGX_HTTP_NO_CONTENT, NULL, 0);
assert(msg == NULL);
spool->msg = NULL;
}
break;
case MSG_NORESPONSE:
if(prev_status == MSG_PENDING) {
spool->msg_status = MSG_INVALID;
if(spool->sub_count > 0) {
nomsg_retry_data_t *retry_data = ngx_alloc(sizeof(*retry_data), ngx_cycle->log);
retry_data->spooler = spl;
free_msg_id = 0;
retry_data->msg_id = data->msgid;
spooler_add_timer(spl, NCHAN_MSG_NORESPONSE_RETRY_TIME, spool_fetch_msg_noresponse_retry_callback, spool_fetch_msg_noresponse_retry_cancel, retry_data);
}
}
break;
case MSG_NOTFOUND:
if(spl->fetching_strategy == FETCH_IGNORE_MSG_NOTFOUND) {
spool->msg_status = prev_status;
break;
}
case MSG_EXPIRED:
//is this right?
//TODO: maybe message-expired notification
spool->msg_status = findmsg_status;
spool_respond_general(spool, NULL, NGX_HTTP_NO_CONTENT, NULL, 0);
nuspool = get_spool(spool->spooler, &oldest_msg_id);
if(spool != nuspool) {
spool_transfer_subscribers(spool, nuspool, 1);
destroy_spool(spool);
}
else {
ERR("Unexpected spool == nuspool during spool fetch_msg_callback. This is weird, please report this to the developers. findmsg_status: %i", findmsg_status);
assert(0);
}
break;
case MSG_PENDING:
ERR("spool %p set status to MSG_PENDING", spool);
break;
default:
assert(0);
break;
}
if(free_msg_id) {
nchan_free_msg_id(&data->msgid);
}
ngx_free(data);
return NGX_OK;
}
static ngx_int_t spool_nextmsg(subscriber_pool_t *spool, nchan_msg_id_t *new_last_id) {
subscriber_pool_t *newspool;
channel_spooler_t *spl = spool->spooler;
ngx_int_t immortal_spool = spool->id.time == NCHAN_NEWEST_MSGID_TIME;
int16_t largetags[NCHAN_MULTITAG_MAX];
nchan_msg_id_t new_id = NCHAN_ZERO_MSGID;
nchan_copy_msg_id(&new_id, &spool->id, largetags);
nchan_update_multi_msgid(&new_id, new_last_id, largetags);
//ERR("spool %p nextmsg (%V) --", spool, msgid_to_str(&spool->id));
//ERR(" -- update with (%V) --", msgid_to_str(new_last_id));
//ERR(" -- newid %V", msgid_to_str(&new_id));
if(msg_ids_equal(&spool->id, &new_id)) {
ERR("nextmsg id same as curmsg (%V)", msgid_to_str(&spool->id));
assert(0);
}
else {
newspool = !immortal_spool ? find_spool(spl, &new_id) : get_spool(spl, &new_id);
if(newspool != NULL) {
assert(spool != newspool);
spool_transfer_subscribers(spool, newspool, 0);
if(!immortal_spool) destroy_spool(spool);
}
else {
ngx_rbtree_node_t *node;
assert(!immortal_spool);
node = rbtree_node_from_data(spool);
rbtree_remove_node(&spl->spoolseed, node);
nchan_copy_msg_id(&spool->id, &new_id, NULL);
rbtree_insert_node(&spl->spoolseed, node);
spool->msg_status = MSG_INVALID;
spool->msg = NULL;
newspool = spool;
/*
newspool = get_spool(spl, &new_id);
assert(spool != newspool);
spool_transfer_subscribers(spool, newspool, 0);
destroy_spool(spool);
*/
}
if(newspool->non_internal_sub_count > 0 && spl->handlers->bulk_post_subscribe != NULL) {
spl->handlers->bulk_post_subscribe(spl, newspool->non_internal_sub_count, spl->handlers_privdata);
}
if(newspool->sub_count > 0) {
switch(newspool->msg_status) {
case MSG_CHANNEL_NOTREADY:
newspool->msg_status = MSG_INVALID;
case MSG_INVALID:
spool_fetch_msg(newspool);
break;
case MSG_EXPECTED:
spool_respond_general(newspool, NULL, NGX_HTTP_NO_CONTENT, NULL, 0);
break;
default:
break;
}
}
}
return NGX_OK;
}
ngx_buf_t *nchan_channel_info_buf(ngx_str_t *accept_header, ngx_uint_t messages, ngx_uint_t subscribers, time_t last_seen, nchan_msg_id_t *last_msgid, ngx_str_t **generated_content_type) {
ngx_buf_t *b = &channel_info_buf;
ngx_uint_t len;
const ngx_str_t *format = &NCHAN_CHANNEL_INFO_PLAIN;
time_t time_elapsed = ngx_time() - last_seen;
static nchan_msg_id_t zero_msgid = NCHAN_ZERO_MSGID;
if(!last_msgid) {
last_msgid = &zero_msgid;
}
ngx_memcpy(&channel_info_content_type, &NCHAN_CONTENT_TYPE_TEXT_PLAIN, sizeof(NCHAN_CONTENT_TYPE_TEXT_PLAIN));
b->start = channel_info_buf_str;
b->pos = b->start;
b->last_buf = 1;
b->last_in_chain = 1;
b->flush = 1;
b->memory = 1;
if(accept_header) {
//lame content-negotiation (without regard for qvalues)
u_char *accept = accept_header->data;
len = accept_header->len;
size_t rem;
u_char *cur = accept;
u_char *priority=&accept[len-1];
for(rem=len; (cur = ngx_strnstr(cur, "text/", rem))!=NULL; cur += sizeof("text/")-1) {
rem=len - ((size_t)(cur-accept)+sizeof("text/")-1);
if(ngx_strncmp(cur+sizeof("text/")-1, "plain", rem<5 ? rem : 5)==0) {
if(priority) {
format = &NCHAN_CHANNEL_INFO_PLAIN;
priority = cur+sizeof("text/")-1;
//content-type is already set by default
}
}
nchan_match_channel_info_subtype(sizeof("text/")-1, cur, rem, &priority, &format, &channel_info_content_type);
}
cur = accept;
for(rem=len; (cur = ngx_strnstr(cur, "application/", rem))!=NULL; cur += sizeof("application/")-1) {
rem=len - ((size_t)(cur-accept)+sizeof("application/")-1);
nchan_match_channel_info_subtype(sizeof("application/")-1, cur, rem, &priority, &format, &channel_info_content_type);
}
}
if(generated_content_type) {
*generated_content_type = &channel_info_content_type;
}
len = format->len - 8 - 1 + 3*NGX_INT_T_LEN; //minus 8 sprintf
if(len > 512) {
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, 0, "NCHAN: Channel info string too long: max: 512, is: %i", len);
len = 512;
}
b->last = ngx_sprintf(b->start, (char *)format->data, messages, last_seen==0 ? -1 : (ngx_int_t) time_elapsed, subscribers, msgid_to_str(last_msgid));
b->end = b->last;
return b;
}
