Actually, we already capture that information for TPC g-stream monitoring
which I always said was the preferable way of doing this instead of
relying on perf markers. So, it's just a matter of propogating that IP
address.
On Fri, 23 Sep 2022, Brian P Bockelman wrote:
> @ccaffy - the two places where the perf markers are sent are:
> - https://github.com/xrootd/xrootd/blob/master/src/XrdTpc/XrdTpcTPC.cc#L599
> - https://github.com/xrootd/xrootd/blob/master/src/XrdTpc/XrdTpcMultistream.cc#L325
>
> Now, the thing needing testing here is that we ask libcurl for the current socket's IP address in order to get the list of addresses (which then @mpatrascoiu uses to determine IPv4-vs-IPv6). I do not know if, at the beginning or the end of the transfer, libcurl knows the primary data transfer socket yet. I suspect you might have some luck at the end of the transfer.
>
> If libcurl doesn't persist this information, then you might have to query it in the write/read callback and cache it (which would be quite ugly in my opinion). That would correctly label in the cases of a transfer of >1 bytes.
>
> Another, perhaps cleaner option, would be to utilize the open socket callback already used for the gstream monitoring (implemented by @abh3):
>
> https://github.com/xrootd/xrootd/blame/master/src/XrdTpc/XrdTpcTPC.cc#L599
>
> Given the callback is invoked for each HTTP server (including redirectors), you may end up with a sequence of servers and only the last is the one where you possibly transfer data.
>
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