Experimental Physics and
Industrial Control System

Michael Davidsaver via Core-talk <core-talk at aps.anl.gov> · Fri, 25 Aug 2023 07:40:46 +0200

On 8/24/23 13:43, Murray, Doug wrote:

Thanks Heinz,

I just pulled the latest p4p (also version 4.1.10) and :cache is working fine for me now!

The ds:byhost:tx is doing something different,

failing on a call to gethostbyname() in gw.py,

Do you have a stack trace for this?

I like DNS names, but only when they arrive promptly.  Which may not be the
case with gethostbyname().  So as a general rule, I try to avoid lookups
after startup.

where the name is set to ‘[‘.  Why am I thinking this looks like IPv5? 😉 I’ll look into my network setup here…

drm@aird-b50-srv01 01:30 PM 1187>pvget PGW:LCLSPB:ds:byhost:tx

PGW:LCLSPUB:ds:byhost:tx 2023-08-24 13:31:01.656

Account                        Client "TX (B/s)"

     drm [::ffff:134.79.120.20]:52372    43.7333

     drm [::ffff:134.79.216.24]:35854    5.93333

     drm  [::ffff:134.79.216.6]:42150    5.93333

cheers

-doug

*From: *Heinz Junkes <junkes at fhi-berlin.mpg.de>
*Date: *Thursday, August 24, 2023 at 1:01 PM
*To: *Michael Davidsaver <mdavidsaver at gmail.com>
*Cc: *Murray, Doug <drm at slac.stanford.edu>, EPICS CoreTalk <core-talk at aps.anl.gov>
*Subject: *Re: PVA Gateway (p4p) is Missing some Status PVs

I can confirm that with p4p version: 4.1.10

(base) hactar:~ junkes$ pvget FHIFEL:PVA_GW:STS:cache

FHIFEL:PVA_GW:STS:cache <undefined>              []

Still an empty list there.

(base) hactar:~ junkes$ pvget FHIFEL:PVA_GW:STS:ds:byhost:tx

FHIFEL:PVA_GW:STS:ds:byhost:tx 2023-08-24 21:54:49.296

Account              Client  "TX (B/s)"

wieland 141.14.64.252:61925 1.20526e+06

But ds:byhost:tx is ok.

Heinz

    On 24. Aug 2023, at 11:43, Michael Davidsaver via Core-talk <core-talk at aps.anl.gov> wrote:

    On 8/23/23 09:56, Murray, Doug wrote:

        We’ve been setting up the latest version of the p4p PVA Gateway (R4.1.9) and have noticed that a couple status PVs are no longer providing expected results.
          * The *<statusprefix>cache* PV always returns an empty list, but previously provided “a list of channels to which the GW Client is connected”.

    This was an oversight when porting to PVXS.  I had a couple of TODO items
    which did not get marked as such.

    https://github.com/mdavidsaver/p4p/commit/2930d9fcc0370ef3f292f5d24a46d1b4ef98f314#diff-8061cbf72533fa48d08f5f9891a94f5ebeaaffbba7f9e5cdae7aa10d594d09deR945

          * The *<statusprefix>ds:byhost:tx* PV always provides the same client host address as 255.255.255.255, regardless of the client’s true IP address.

    Can you provide some more detail?

    My usual testing is all on one host with different ports.  So I can see
    how I might not notice an issue like this.  However, I can check the port
    numbers with the output of `netstat -tpn`.  From what I see, I think the
    IP:port reported by in the ds: and us: tables are socket peer addresses.

        These were working well in previous versions.  Has anybody else encountered this?
        cheers
        -doug
        SLAC

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System