ngx_buf_t *nchan_channel_info_buf(ngx_str_t *accept_header, ngx_uint_t messages, ngx_uint_t subscribers, time_t last_seen, 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;
ngx_memcpy(&channel_info_content_type, &TEXT_PLAIN, sizeof(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;
size_t 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
assert(len < 512);
b->last = ngx_sprintf(b->start, (char *)format->data, messages, last_seen==0 ? -1 : (ngx_int_t) time_elapsed, subscribers);
b->end = b->last;
return b;
}
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;
}
