Hi there, I'm trying to develop a simple plugin for TS but I'm having
trouble with some API functions. I'm using the 2.1.7 unstable version
and noticed that there has been some pretty mayor changes in some
functions since 2.1.5. Specifically I'm struggling with the use of
TSHttpHdrTypeGet, which I've noticed has changed from prototype:
TSMLoc TSHttpHdrUrlGet (TSMBuffer bufp, TSMLoc req_hdr_loc);
to prototype:
TSReturnCode TSHttpHdrUrlGet(TSMBuffer bufp, TSMLoc obj, TSMLoc *locp);
Now I suppose the new version just returns a success/failure code and
the actual TSMLoc object we are looking is being referenced by locp
(if return code is TS_SUCCESS).
The problem is I have not been able to get anything useful from this
function, furthermore the variable holding the return code can't be
associated with either TS_SUCCESS or TS_ERROR. Here's a oversimplified
version of what I am doing:
---------------------------------------------------------------------------------------------------------------
cacheable(TSHttpTxn txnp){
TSMBuffer bufp;
TSMLoc hdr_loc;
TSMLoc url_loc;
TSHttpType hdr_type;
TSReturnCode retv = TS_SUCCESS;
TSHttpTxnClientReqGet(txnp, &bufp, &hdr_loc);
hdr_type = TSHttpHdrTypeGet(bufp,hdr_loc);
switch(hdr_type){
case TS_HTTP_TYPE_REQUEST:
url_loc = TSHttpHdrCreate(bufp);
retv = TSHttpHdrUrlGet(bufp,hdr_loc,&url_loc);
if(retv == TS_SUCCESS){
//print url
} else if(retv == TS_ERROR){
// print error msg
} else{
TSDebug("test-plugin","\t\tHttpHdrUrlGet
returned : %d",retv);
}
default:
//Default msg
}
}
---------------------------------------------------------------------------------------------------------------
cacheable is a function called from within a continuation that is
hooked to the TS state machine through a TS_HTTP_OS_DNS_HOOK.
Apparently everything goes smooth as TSHttpTxnClientReqGet succesfully
sets both bufp and hdr_loc correctly and the subsequent call to
TSHttpHdrTypeGet correctly sets hdr_type to TS_HTTP_TYPE_REQUEST. But
the problem arises as I try to check the value returned by
TSHttpHdrUrlGet. To my surprise it falls on the second else and prints
something like this:
[Mar 30 18:22:43.060] Server {1105197376} DIAG: (test-plugin)
HttpHdrUrlGet returned : -1292229864
I don't really know why this could be happening, since I checked the
source code and verified that only TS_SUCCESS or TS_ERROR are to be
returned. Of course, if from within the second else I make a call to
TSUrlStringGet and pass the obtained url_loc I get a segmentation
fault.
Does someone know what I'm doing wrong here?
Thanks
Nelson R. Perez
