+1
Also, please be aware that the VPP cli is by design "The Debug CLI" and
is not intended for use as a production API.
VPP cli commands can be changed without warning and without any
guarantee of backwards compatibility.
Thanks,
-daw-
On 5/27/2020 8:53 AM, Chris Luke wrote:
That is quite odd indeed. This is the sort of issue that could take
some time to properly diagnose and I cannot dig in to it right away.
For now, if you are not using the output, perhaps as a workaround
simply redirect stdout to /dev/null?
That said, if this part of a larger application, I suspect SR provides
API access and that will generally be much more performant than using
vppctl.
Chris.
*From:*Chinmaya Aggarwal <chinmaya.agar...@hsc.com>
*Sent:* Wednesday, May 27, 2020 05:47
*To:* Luke, Chris <chris_l...@cable.comcast.com>; vpp-dev@lists.fd.io
*Subject:* Re: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command
execution giving error
Attached is the sample VPP commands script, having a delay of 50 ms.
Below is the screenshot of he output we get on running the script : -
Request 88 : time 14:05:01.906
Request 89 : time 14:05:01.906
Request 90 : time 14:05:02.043
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# Request 91 : time 14:05:02.043
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# Request 92 : time 14:05:02.213
Request 93 : time 14:05:02.213
Request 94 : time 14:05:02.358
The commands are executed sequentially at a gap of 50 ms. As seen from
the execution time displayed by the script, we never see a situation
where the gap is more than 1 sec.
Can you please guide us through this?
Thanks and Regards,
Chinmaya Agarwal.
------------------------------------------------------------------------
*From:*Luke, Chris <chris_l...@comcast.com
<mailto:chris_l...@comcast.com>>
*Sent:* Tuesday, May 26, 2020 7:34 PM
*To:* Luke, Chris <chris_l...@comcast.com
<mailto:chris_l...@comcast.com>>; Chinmaya Aggarwal
<chinmaya.agar...@hsc.com <mailto:chinmaya.agar...@hsc.com>>;
vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io
<mailto:vpp-dev@lists.fd.io>>
*Subject:* RE: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command
execution giving error
CAUTION:This email originated from an external organization
Actually, I missed one detail, if you tell vppctl to run a command
using its command line arguments, it will always assume non-interactive.
The only way you’ll see the banner, then, is if the 1s session startup
timer expires and it makes assumptions. In those cases that you see
the output, does the script you run stall for a second?
Chris.
*From:* vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>
<vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>> *On Behalf Of
*Chris Luke
*Sent:* Tuesday, May 26, 2020 09:40
*To:* Chinmaya Aggarwal <chinmaya.agar...@hsc.com
<mailto:chinmaya.agar...@hsc.com>>; vpp-dev@lists.fd.io
<mailto:vpp-dev@lists.fd.io>
*Subject:* Re: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command
execution giving error
You’ll get the banner if it thinks it’s an interactive session.
Roughly vppctl does this (I am paraphrasing):
is_interactive = isatty(STDIN);
…
if (is_interactive) TERM = “vppctl”;
…
open telnet session to the CLI socket; pass the terminal information
Then in VPP:
is_interactive = (strcmp(TERM, “vppctl”) != 0);
…
if (is_interactive) emit_banner();
The passing of the terminal options in the TELNET protocol is bounded
by a timer (1 second); if for whatever reason that information arrives
late, VPP will make assumptions; typically that the terminal is of the
‘dumb’ type rather than non-interactive.
Does this correlate to what you are observing? Does the output you see
make use of ANSI color? That would be another clue, the ‘dumb’
terminal doesn’t use color.
Chris.
*From:* vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>
<vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>> *On Behalf Of
*Chinmaya Aggarwal
*Sent:* Tuesday, May 26, 2020 08:19
*To:* vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>
*Subject:* [EXTERNAL] Re: [vpp-dev] VPP sequential policy command
execution giving error
Further adding to observations regarding above issue, we have created
a script that has only vpp commands running sequentially having a
constant delay between the execution of each commands. On running the
script, we again see VPP shell output as shown below :-
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
We executed the script with delay of 10ms, 50ms and 100ms. In
most of the cases, we get no output from vppctl command but in
some random times, we get the vpp shell as output of the command.
Please suggest, in what scenarios does the vpp return this kind of output?
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