There are two API: TSHttpTxnClientRespBodyBytesGet
and TSHttpTxnClientRespHdrBytesGet (can be invoked in
TS_HTTP_TXN_CLOSE_HOOK in my test). I think their returned value are %<pscl>
and %<pshl>.
Content-Length is larger than transfered length, because user-agent can
easily abort request.
On Fri, Aug 17, 2012 at 10:47 AM, Phil Sorber <p...@omniti.com> wrote:
> Does your plugin handle chunked encoding?
>
> On Thu, Aug 16, 2012 at 8:14 PM, Adam Phelps <a...@opendns.com> wrote:
> > I'm working on a plugin, one of the functions of which is to accurate
> track
> > how much data is being sent to a given client, both for totals and a
> > per-UserAgent count.
> >
> > This seems to mostly work, but I'm seeing some major discrepancies
> between
> > what the plugin is reporting and what is actually being sent out
> (measured
> > via collectd and iptables) when doing streaming (via youtube). And these
> > are major differences, the plugin reports 100GB for an hour of youtube
> > streaming, where my other counters should closer to 600MB. The 600MB
> number
> > seems about right for this sort of content.
> >
> > The method I'm using to track the totals sent are to set a global hook
> for
> > TS_HTTP_SEND_RESPONSE_HDR_HOOK and then get and sum up the
> > TS_MIME_FIELD_CONTENT_LENGTH header. However with the youtube streaming
> > this will see much larger numbers for Content-Length than even what is
> > reported in the ATS log (via %<psql> in logs_xml.config).
> >
> > Here's how I'm getting the content length in the hook attached to
> > TS_HTTP_SEND_RESPONSE_HDR_HOOK:
> >
> > if (TSHttpTxnClientRespGet(txnp, &resp_bufp, &resp_loc) !=
> > TS_SUCCESS) {
> > LOG(LOG_ERROR,
> > "Error while retrieving resp header\n");
> > goto OUT;
> > }
> >
> > /* Lookup the Content-Length field */
> > TSMLoc content_len_loc = TSMimeHdrFieldFind(resp_bufp, resp_loc,
> > TS_MIME_FIELD_CONTENT_LENGTH,
> > TS_MIME_LEN_CONTENT_LENGTH);
> > if (!content_len_loc) {
> > goto OUT;
> > }
> > int content_len_val_len;
> > const char *content_len_val =
> > TSMimeHdrFieldValueStringGet(resp_bufp, resp_loc,
> > content_len_loc, 0,
> > &content_len_val_len);
> > if (!content_len_val) {
> > LOG(LOG_ERROR, "Failed to get Content-Length value");
> > goto OUT;
> > }
> >
> > This is clearly not working for streaming, is there a better way to get
> the
> > total size of the data being returned to the requesting client?
> >
> > - Adam
>
