> Doing this through the ODB seems ok to me. If the ODB cannot be accessed, you can fall back to no protection.
> 
> At PSI we fortunately do not have these network scans because PSI uses a institute-wide firewall.
>

Same here at TRIUMF, no problems with hostile network activity. Only see this trouble at CERN. Nominally CERN also have
everything behind the CERN firewall, that is why I tend to think that I am seeing network scans done by CERN security people,
or some badniks on the CERN local network (PC malware, etc).

> So you can connect from outside PSI to inside PSI only 
> on certain well-defined ports (like SSH to certain machines). You can do the same in Alpha. Use one computer as a router with two network cards, where 
> the DAQ network runs on the second card as a private network. Then program the routing tables in that gateway such that only certain ports can be 
> accessed from outside, like port 8080 to mhttpd. This way you block all except the things which are needed.

Yes, this is how we did it for DEAP at SNOLAB. No network trouble there.

But generically for MIDAS, I think we should have built-in capability for MIDAS to protect itself without reliance on OS-level means (local firewall)
or network-level means ("site firewalls").

Sometimes we have very small MIDAS installations, i.e. just one machine by itself, and such setups should be secure/secured easily -
too much work to setup an external firewall box just for one machine and OS-level firewall rules sometimes conflict
with some OS services (i.e. NIS) (I am still waiting for the "NIS to LDAP migration for dummies" guide).

K.O.

> Sometimes we have very small MIDAS installations, i.e. just one machine by itself, and such setups should be secure/secured easily -
> too much work to setup an external firewall box just for one machine and OS-level firewall rules sometimes conflict
> with some OS services (i.e. NIS) (I am still waiting for the "NIS to LDAP migration for dummies" guide).

I fully agree with you. So if you find time to implement this, I will be more than happy.

/Stefan

Hi,
I have a bank of floats with slow control values that I store to the history and
ODB. When reading the history, both in the webbrowser and with mhist, the floats
get read with the wrong endianness; under /equipment/variables in the ODB they
however display correctly. System is a an intel OpenSuse linux box. Any ideas?

Thanks

Nik

By accident we had history variables with leading spaces. The history schema check then decides that this is a new variable (the leading space is not read from the history file) and starts a new file. We found this because the run start became slow due to the many, many history files created. It would be nice to just get an error if one has a malformed variable name like this.

How to reproduce: Try to put a variable with a leading space in the name into the history, repeatedly start runs.
Sugested fix: Produce an error if a history variable has a leading space.

I added now code to the logger so it properly complains if there would be a leading space in a variable name.

Stefan

> By accident we had history variables with leading spaces. The history schema check then decides that this is a new variable (the leading space is not read from the history file) and starts a new file. We found this because the run start became slow due to the many, many history files created. It would be nice to just get an error if one has a malformed variable name like this.
> 
> How to reproduce: Try to put a variable with a leading space in the name into the history, repeatedly start runs.
> Sugested fix: Produce an error if a history variable has a leading space.

Dear experts,
         I would like to have some clarification about the meaning and use of the 
tags in the ODB under /History/Tags.

I noticed that, if a history plot is created, but the name of the corresponding 
variable is changed later and the plot is modified accordingly, the old name 
persists in the /History/Tags list along with the new one. So, it appears in the 
list of variables when a new history plot is created.

It seems not to compromise the functionalities of the history system, but it is 
prone to create confusion.

Is it the expected behavior? What is the correct procedure to follow if the name 
of a variable has to be changed?

Thank you,
     Francesco

This part of the system has been designed by KO, so he should reply here.

Stefan

> This part of the system has been designed by KO, so he should reply here.

That's right. Some of this stuff is historical gibberish that is no longer needed 
for FILE and SQL histories.

/History/Events is needed to create persistent mapping between history event names 
and history event id's (at some point history event id was same equipment event 
id, with the obvious problems when equipment event ids are duplicated, reused, 
renamed, deleted).

/History/Tags was used by the history editor to speed up "give me all tag names 
for this history event name". With the "MIDAS" history storage this required 
reading a lot of data from disk. With the "FILE" history and cached ZFS SSD, disk 
access is much cheaper and caching history event names and tags in odb is no 
longer necessary.

/History/Tags should probably be removed (be check that nobody uses it first).

/History/Events has to remain as long as "MIDAS" history storage is still used.

K.O.

This is a known problem and I'm working on. See the discussion at: 

https://bitbucket.org/tmidas/midas/issues/305/log_history_periodic-doesnt-account-for

Stefan

https://bitbucket.org/tmidas/midas/issues/305/log_history_periodic-doesnt-account-for

this problem is a blocker for the next midas release.

the best I can tell, current development version of midas writes history data incorrectly,
but I do not have time to look at it at this moment.

I recommend that people use the latest released version, midas-2020-12. (this is what we have on alphag and 
should have in alpha2).

midas-2020-12 uses mlogger from midas-2020-08.

If I cannot find time to figure out what is going on in the mlogger,
the next release may have to be done the same way (with mlogger from midas-2020-08).

K.O.

The problem has been fixed on commit 825935dc on Oct. 2021 and runs fine since then at PSI. If TRIUMF people 
agree, we can close that issue and proceed.

Stefan

Hello experts,

I have been writing a SC frontend for a powersupply. I have used the model 
where the frontend can be started with "-i n" option so that each fe can 
control a different supply. During the development/testing of the program I 
would normally only run a single instance with "-i 1". However when I started
a second instance with "-i 2" I found problems with the history plots that
were being made for the original "-i 1" instance. The variable being plotted
seemed to randomly jump between the value from the "-i 1" instance and 
the "-i 2" instance.  confirmed that the "correct" values exist for each 
frontend in the odb under /Equipment/Foo01/Variables and 
/Equipment/Foo02/Variables

This is also not just a plotting artifact since I was also
able to see the two different values by running mhist.

I saw this behaviour using midas-2019-03 and also the head of the development
branch (686e4de2b55023b0d1936c60bcf4767c5e6caac0 from just under 48 hours ago). 

I was able to reproduce this with a stripped down frontend that just 
sets a variable that is equal to its frontend_index. Please find the code 
and Makefile attached. Presumably I've done something wrong in my 
implementation that hopefully a more experienced person can spot quite 
quickly, but please let me know if any more information is needed.

I have seen this behaviour on both Debian 10 and on a CentOS 7 Singularity 
image running on top of Debian 10.

Thanks,

Nick.

P.S. I made the topic of this post "Forum" and not "Bug Report" since I
expect the root of this problem is somewhere between the keyboard and chair.

My first question would be why are you using several font-ends at all? That makes things more 
complicated than needed. In the normal FE framework, you can define either several equipment 
served by one frontend, or even one equipment linked to several devices. In the MEG experiment 
we have one slow control frontend controlling ~100 devices without problem. In the old days there 
was a problem that some slow devices could throttle the readout, but since the invention of multi-
threaded slow control equipment, each device gets its own thread so they don't block each other.

Stefan

Hi Stefan,

thanks for you quick reply.

> My first question would be why are you using several font-ends at all?

Becuase I was following the model used for many of the frontends for the ND280 FGD.

> That makes things more 
> complicated than needed. In the normal FE framework, you can define either several equipment 
> served by one frontend, or even one equipment linked to several devices. In the MEG experiment 
> we have one slow control frontend controlling ~100 devices without problem. In the old days 
there 
> was a problem that some slow devices could throttle the readout, but since the invention of 
multi-
> threaded slow control equipment, each device gets its own thread so they don't block each 
other.

Perhaps things have changed in the 10 years since the FGD SC code was written. I can do it 
differently but doing it that way seemed naturual since around 90% of the frontend code that I
have see does it that way.

Nick.

hi, 

> > That makes things more 
> > complicated than needed. In the normal FE framework, you can define either several equipment 
> > served by one frontend, or even one equipment linked to several devices. In the MEG experiment 
> > we have one slow control frontend controlling ~100 devices without problem. In the old days 
> there 
> > was a problem that some slow devices could throttle the readout, but since the invention of 
> multi-
> > threaded slow control equipment, each device gets its own thread so they don't block each 
> other.
> 

I agree with Stefan, that it's probably better to run a multi-threaded setup, than individual frontends.

The only place I've ever used the frontend index on startup is when I was testing and building
an eventbuilder.

https://midas.triumf.ca/MidasWiki/index.php/Event_Builder#Example

This might explain, why your history is swapping between frontends, as in the event builder, it gets
reconstructed.

Maybe this helps...

LCP


> Perhaps things have changed in the 10 years since the FGD SC code was written. I can do it 
> differently but doing it that way seemed naturual since around 90% of the frontend code that I
> have see does it that way.

Hi Nick,

I confirm that this issue appears when using the MIDAS history driver. The issue does not appear when using the MYSQL history driver.

One solution is to give each frontend instance a different Event ID (see example code below for doing this in frontend_init). The history system did still seem to be confused by the existing FeDummy equipments/events even after making this change. However, after changing EQ_NAME from FeDummy to FeDum (i.e. starting from a clean state history-wise) things behaved normally.

I will note that some experiments definitely have a need for the "-i" method, especially those that run on distributed clusters.

Ben


```
INT frontend_init()
{
   sprintf(eq_name, "%s%02d", EQ_NAME, get_frontend_index());

   // Ensure each FE gets a different Event ID in the history system (951, 952 etc)
   char keyname[128];
   HNDLE hkey;
   int status;
   sprintf(keyname, "/Equipment/%s/Common/Event ID", eq_name);
   status = db_find_key(hDB, 0, keyname, &hkey);
   if (status != DB_SUCCESS) abort();

   WORD new_ev_id = 950 + get_frontend_index();
   status = db_set_data_index(hDB, hkey, &new_ev_id, 2, 0, TID_WORD);
   if (status != DB_SUCCESS) abort();
   return SUCCESS;
}
```

Hi LCP,

thanks for the suggestion and link. Unfortunatly I don't think this explains it.

Nick.

Hi Ben,

thanks for your reply. I can confirm that your suggested workaround does indeed
make the problem dissapear.

I guess this issue hasn't been seen at T2K since we use MYSQL for the history.

Thanks,

Nick.

Hi Ben,

thanks for your reply. I can confirm that your suggested workaround does indeed
make the problem dissapear.

I guess this issue hasn't been seen at T2K since we use MYSQL for the history.

Thanks,

Nick.