Hi. We've just updated our midas installation to the newest version, and we now see repeated errors from the 
mserver in messages. Mostly we see

11:17:02.994 2018/08/21 [ODBEdit,TALK] Program mserver restarted

which happens 2-3 times per minute. 

We have also been seeing occasional dropped rpc connections to our frontends, which could be related. 

The version we were running with previously was ~1 year old, and we have just updated to the newest version 
on bitbucket. 

Thanks,
Wes

> Hi. We've just updated our midas installation to the newest version, and we now see repeated errors from the 
> mserver in messages. Mostly we see
> 
> 11:17:02.994 2018/08/21 [ODBEdit,TALK] Program mserver restarted
> 
> which happens 2-3 times per minute. 
> 
> We have also been seeing occasional dropped rpc connections to our frontends, which could be related. 
> 
> The version we were running with previously was ~1 year old, and we have just updated to the newest version 
> on bitbucket. 

Hmm... usually mserver will not restart automatically, maybe you have set it to autorestart on ODB (/programs/mserver/auto_restart 
set to "y").

It would be unusual for the main mserver program to crash, to debug it, you will need to run it in a terminal
and see if there is any error messages. Even better to run it in a terminal inside "gdb" and capture the stack trace
when it crashes.

Anyhow, crash of main mserver will not cause "dropped rpc connections" to clients - this would require for their
individual mserver subprocesses to crash. Such crashes would be highly unusual and are harder to debug.

Perhaps for the crashes you see there is some error messages in midas.log?

K.O.

As of commit
https://bitbucket.org/tmidas/midas/commits/dfa5fb1a93cae11a2960d441044c7fd277e1f0ec
(we are now liberated from the tyranny of SVN IDs),
multithreaded run transitions seem to work reliably and are now the default in mhttpd.

In odbedit and mtransition, the default is the old sequential transitions. "-m" and "-a" flags activate 
the new multithread run transitions. mhttpd now uses the equivalent of "mtransition -a" 
(mutithreaded asynchronous).

This is one of the new features implemented by Stefan while at TRIUMF.

K.O.

(We hope to write up all the recent changes soon).

Hi,
 I am really puzzled: I am running the very same as far as sources
are concerned (Dec 12, 2003 snapsot) midas frontend (miniexp + camacnul)
on two different machines (and the same trusted private network):

1) one is an ancient Pentium/100 MHz laptop with RedHat Linux 7.3 and 
2) another one is event more ancient MVME167 25MHz running VxWorks 5.4.2

The front end on my Linux PC works just fine, whereas on the MVME167
I get intermittent crashes (most often at the end of the run).
[Correction: the crashes happen, I think, when the frontend wants 
to update the ODB]

The crashes happen in db_set_record routines

Any ideas what might be wrong? 
Except that MVME167 is a piece of ...#@!% 

Piotr

A followup: I traced back the problem to version 1.9.2.

Version 1.9.1 does not have this problem but 1.9.2 does. 
For now I stick with 1.9.1

Piotr
 

I want to read data from the ODB with the mvodb interface in one of my frontends, it's useful to know how old that data is, so I prototyped functionality in a pull request to mvodb:

https://bitbucket.org/tmidas/mvodb/pull-requests/2/add-readkeylastwritten-function-to-extract

> I want to read data from the ODB with the mvodb interface in one of my frontends, it's useful to know how old that data is, so I prototyped functionality in a pull request to mvodb:
> 
> https://bitbucket.org/tmidas/mvodb/pull-requests/2/add-readkeylastwritten-function-to-extract

Thanks for raising that point. I realized that the odbxx API was also missing that functionality, so I added it: 
https://bitbucket.org/tmidas/midas/commits/6991a92c19292eaf67721cb80f182c61db077f45

Best,
Stefan

the mxml library was updated to make it thread-safe.
https://bitbucket.org/tmidas/mxml/src/master/

I also take an opportunity to remind all to update your copy to the latest version
as I just stumbled on old bug that I fixed 1 year ago (crash of mlogger)
but forgot to update all and every of my copies of mxml.

I also looked at the xml encoder and I see that it has several places where it may
truncate the data, but none of these places can cause truncation of ODB data
because the fixed-size internal buffers are big enough to hold the longest
values sent by the odb xml encoder.

K.O.

> > > the midas release 2019-03 is ready for general use.
> A bug fix update for midas-2019-03:
> odbedit "ver" should report: Thu Jun 6 18:02:14 2019 -0700 - midas-2019-03-h on branch feature/midas-2019-03

For building this release of MIDAS, please use mxml branch feature/midas-2019-03, tag mxml-2019-03-a:

cd .../mxml
git fetch
git checkout feature/midas-2019-03

Going forward, I will try to remember to tag the mxml version that corresponds to specific midas versions.

K.O.

I have a web page and I try to use modbvalue, but nothing happens. The best I can tell, I follow the documentation 
(https://midas.triumf.ca/MidasWiki/index.php/Custom_Page#modbvalue).

<td id=setv0><div class="modbvalue" data-odb-path="/Equipment/CAEN_hvps01/Settings/VSET[0]" data-odb-editable="1">(ch0)</div></td>

I suppose I could add debug logging to the javascript framework for modbvalue to find out why it is not seeing
or how it is not liking my web page.

But how would a non-expert user (or an expert user in a hurry) would debug this?

Should the modbvalue framework log more error messages to the javascrpt console ("I am ignoring your modbvalue entry because...")?

Should it have a debug mode where it reports to the javascript console all the tags it scanned, all the tags it found, etc
to give me some clue why it does not find my modbvalue tag?

Right now I am not even sure if this framework is activated, perhaps I did something wrong in how I load the page
and the modbvalue framework is not loaded. The documentation gives some magic incantations but does not explain
where and how this framework is loaded and activated. (But I do not see any differences between my page and
the example in the documentation. Except that I do not load control.js, I do not need all the thermometer bars, etc.
If I do load it, still my modbvalue does not work).

K.O.

Can you post your complete page here so that I can have a look?

Stefan

Hey,

while trying to compile Midas under openSUSE 15.0 with mysql support, I was
running into the problem that somehow the mysql header file my_global.h is not
included in the packages. This might be a bug that concerns the suse developers
more, but is it actually needed? Compilation worked fine with the include line
commented out.

If it's not needed, I would like to suggest to remove line 735 of
src/history_schema.cxx (where it's included)

Cheers
Lukas

mysql  Ver 15.1 Distrib 10.2.22-MariaDB, for Linux (x86_64) using  EditLine wrapper
Also, all mariadb development packages are installed

Confirmed. my_global.h is removed in MySQL 8.0 (gives a compile error) and deprecated in 
MariaDB 10.2 (gives a #warning).

I removed include of my_global.h, it is not needed on el6, el7 and ubuntu.

Also added explicit support for mariadb via mariadb_config if it exists.

Note that the cmake build does not actually enable mysql, sqlite and odbc - it detects them, but 
does not do anything about it. We will fix this shortly.

K.O.




> Hey,
> 
> while trying to compile Midas under openSUSE 15.0 with mysql support, I was
> running into the problem that somehow the mysql header file my_global.h is not
> included in the packages. This might be a bug that concerns the suse developers
> more, but is it actually needed? Compilation worked fine with the include line
> commented out.
> 
> If it's not needed, I would like to suggest to remove line 735 of
> src/history_schema.cxx (where it's included)
> 
> Cheers
> Lukas
> 
> mysql  Ver 15.1 Distrib 10.2.22-MariaDB, for Linux (x86_64) using  EditLine wrapper
> Also, all mariadb development packages are installed

Thanks!

the code for writing midas history to mysql has been updated to work against 
MYSQL 8.0.23 (CERN ALPHA-2):

- as ever mysql reports inconsistent data types (I create column with type 
"integer", mysql reports it has type "int" and so forth), the special kludge to 
take care of this had to be tweaked.

- this caused some columns to be marked "inactive" and the code to "reactivate" 
them was missing (fixed)

- binary history event data size was computed incorrectly for events with 
"inactive" columns (fixed) and caused assert() failure and mlogger crash.

- mysql read of column definitions for history event "system" (as in 
/history/links/system) bombed because of incorrect quoting (worked before, why? 
why bombed now?). this caused duplicate columns to be created in mysql table 
"system" and mlogger bomb-out with complaint about "duplicated columns" 
(actually the error message was missing, so it was a silent bomb-out). quoting 
fixed, missing error message fixed, but cleanup of duplicate columns has to be 
done by hand. in case of alpha-2 the fix was to remove the unused 
/history/links/system).

if you are using mysql history please update or patch src/history_schema.cxx.

commit 9d17d2fef233cf457121ca7c2a283c4c76ed33bc

K.O.

the new history panel editor has been activated. it is meant to work the same as 
the old editor, with some improvements to the history variables selection page. 
this new version is written in html+javascript and it will be easier to improve, 
update and maintain compared to the old version written in c++. the old history 
panel editor is still usable and accessible by pressing the "edit in old editor" 
button. please report any problem, quirks and improvements in this thread or in 
the bitbucket bug reports. K.O.

I committed an updated lazylogger with updated documentation. The new version supports subruns and 
can save to external storage arbitrary files (i.e. odb dump files). It also moves most book keeping out of 
odb to permit handling more files on bigger storage disks.

Example lazylogger scripts for castor (CERN) and dcache (TRIUMF) are in the directory "utils".

The lazylogger documentation was updated to remove obsolete information and to describe the new 
functions. As usual "make dox; cd doxfiles/html; firefox index.html" or see my copy at:

http://ladd00.triumf.ca/~olchansk/midas/Utilities.html#lazylogger_task

svn rev 4615, 4616.
K.O.

I received my new 2020 mac book air, so between Stefan and myself, MacOS support for 
MIDAS is assured for 5 more years at the least. K.O.

I started to use the new midas custom page features from 
https://midas.triumf.ca/MidasWiki/index.php/Custom_Page . I'd like to setup the 
editable odb values (.e.g <div name="modbvalue" data-odb-path="/Runinfo/Run 
number" data-odb-editable="1"                    
style="position:absolute;top:157px;left:288px;"></div>) from within javascript, 
which doesn`t seem to work. 

 Both 

document.getElementById("test").innerHTML = '<div data-odb-editable="1" data-
odb-path="/Runinfo/Run number" name="modbvalue" 
style="display:inline;position:absolute;top:157px;left:288px;"></div>'

or 

var elem = document.createElement("div");
	 //var id = "manifold0";
	    elem.setAttribute("name","modbvalue");
	 elem.setAttribute("data-odb-
path","/Equipment/Autofill/Variables/Output[6]");
	 elem.setAttribute("data-odb-editable","1");
	 elem.style="position:absolute;top:157px;left:288px;";
         document.getElementById("test").appendChild(elem);

fail on name="modbvalue" with the error 

mjsonrpc_error_alert: TypeError: Cannot set property 'innerHTML' of undefined


How should one do this? I don`t want hard code everything in the htlm body, as 
I have look up odb key indexes in the javascript code.

The function mhttpd_init() scans the custom page and installs handlers etc. for each modbxxx 
element. If you create an modbvalue dynamically in your code, this is probably done after you 
called mhttpd_init(), so the function has no chance to modify the dynamically created element.

To fix that, I separated mhttpd_init() into the old init function which installs the header and sidebar, 
and a function mhttpd_scan() which scans the custom page and processes all modbxxx elements. 
Next, I tapped the error you reported, and added an automatic call to mhttp_scan() in case that 
happens. I tried it on a test page and it worked for me. Please give it a try (commit 090394e8).

Stefan