Experimental Physics and
Industrial Control System

"Johnson, Andrew N. via Tech-talk" <[email protected]> · Mon, 21 Jan 2019 17:09:58 +0000

Hi Hinko,

On 1/21/19 7:13 AM, Hinko Kocevar via Tech-talk wrote:
> since you pointed me to webEPICS a while ago, we at ESS, managed to
> come up with this little status page:
>
> http://ics-webread01.esss.lu.se/index.html
>
> It show proton count trends and BCM current trace (our ion source is
> currently off).
>
> The code is a fork of webEPICS from github, adopted for EPICSv3 (using
> pyepics).
> My code does not deal with caches and/or converting OPI/BOB to
> HTML/JS/CSS. Instead we opted for having a predefined, simple web
> page that could be extended/reused. There is also a plotly trace
> plotting available.
If there was a server-side data cache in the original it was probably
there to prevent a DoS attack from outside reaching into the control
system network in the event that someone were to send a large number of
requests to the web-server all at once. For your status page, does each
web-client result in a separate pyepics process being started (or cause
a new set of CA-searches or CA-gets to be triggered)? Hopefully you have
some kind of rate limit in place to prevent DoS attacks...

- Andrew

-- 
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System