The bug has been fixed. It was actually in the mxml library. So you have to go to the midas/mxml 
subdirectory and update that one via "git pull origin master".

Stefan

> Hi,
> the subject line describes the project already
> Suppose you have a file foo.msl. Somewhere in the file, you have the line 
> INCLUDE bar.msl
> 
> Once you click save in the sequencer page, mhttpd crashes:
> $ mhttpd
> free(): double free detected in tcache 2
> [1]    27590 abort (core dumped)  mhttpd
> 
> 
> GDB helps shed some light on the problem:
> 
> #0  0x00007ffff76b057f in raise () from /lib64/libc.so.6
> #1  0x00007ffff769a895 in abort () from /lib64/libc.so.6
> #2  0x00007ffff76f39d7 in __libc_message () from /lib64/libc.so.6
> #3  0x00007ffff76fa2ec in malloc_printerr () from /lib64/libc.so.6
> #4  0x00007ffff76fbdf5 in _int_free () from /lib64/libc.so.6
> #5  0x00000000004b8b41 in mxml_parse_entity (buf=buf@entry=0x7fffffffc2c8,
> file_name=file_name@entry=0x7fffffffc710
> "/home/luk/packages/mutrig_daq/online/foo.xml",
>             error=error@entry=0x7fffffffcd24 "XML read error in file
> \"/home/luk/packages/mutrig_daq/online/foo.xml\", line 2: bar.msl.xml is
> missing", error_size=error_size@entry=256,
>                 error_line=error_line@entry=0x7fffffffce24) at ../mxml/mxml.c:1996
> #6  0x00000000004b966d in mxml_parse_file
> (file_name=file_name@entry=0x7fffffffc710
> "/home/luk/packages/mutrig_daq/online/foo.xml",
>             error=error@entry=0x7fffffffcd24 "XML read error in file
> \"/home/luk/packages/mutrig_daq/online/foo.xml\", line 2: bar.msl.xml is
> missing", error_size=error_size@entry=256,
>                 error_line=error_line@entry=0x7fffffffce24) at ../mxml/mxml.c:2041
> #7  0x000000000041d9c2 in init_sequencer () at src/mhttpd.cxx:14321
> #8  0x000000000040c2b6 in main (argc=<optimized out>, argv=<optimized out>) at
> src/mhttpd.cxx:18028
> 
> Cheers
> Lukas
> 
> P. S. This problem reminds me of the old joke: A man goes to his doctor and says
> "Doc, it hurts when I do this" to which the doctor replies "Then don't do that".
> However, I think, mhttpd should not crash even if you're not supposed to include
> non-existent scripts in msequencer.

> ... finding a current midas.log file

On the "help" page, see "midas.log".

Same information is in ODB, the midas log file name is concatenation of "/Logger/Data dir" and "message file".

K.O.

>> [hh19285@it038146 ~]$ which root-config
> /software/root/v6.06.08/bin/root-config
> [hh19285@it038146 ~]$ root-config --cflags
> -pthread -std=c++11 -Wno-deprecated-declarations -m64 -I/software/root/v6.06.08/include
> 
> [hh19285@it038146 build]$ ./analyzer
> Warning in <TClassTable::Add>: class TApplication already in TClassTable
> ...
> ...
> #2  0x00007f7e911b21a4 in TUnixSystem::StackTrace() () from /usr/lib64/root/libCore.so.6.16

You have a mismatch. Your root-config thinks ROOT is installed in /software/..., but the crash
dump says your ROOT libraries are in /usr/lib64/root (not in /software/...).

You can confirm that you are linking against the correct ROOT by running cmake with VERBOSE=1
and examine the linker command line to see what library link path is specified for ROOT.

You can confirm which ROOT library is actually used when you run the analyzer
by running "ldd ./analyzer". You should see the same library paths as specified
to the linker (/software/.../lib*.so). A mismatch can be caused by the setting of LD_LIBRARY_PATH
and by 100 other reasons.

I suggest that you remove the "wrong" ROOT before you continue debugging this.

K.O.

> You can confirm that you are linking against the correct ROOT by running cmake with VERBOSE=1
> and examine the linker command line to see what library link path is specified for ROOT.

Actually you don't call cmake with the verbose flag but specify it during the make phase

$ make VERBOSE=1

to see the command lines.

Stefan

Tue Jul  9 07:24:06 2019 [mhttpd,INFO] Run #13456 started
Wed Jul 10 06:23:58 2019 [mhttpd,ERROR] [system.c:4580:ss_recv_net_command,ERROR] timeout receiving network 
command header
Wed Jul 10 06:23:58 2019 [mhttpd,ERROR] [midas.c:10322:rpc_client_call,ERROR] call to "fedescant" on 
"grsmid00.triumf.ca" RPC "rc_transition": timeout waiting for reply
Wed Jul 10 06:24:02 2019 [mhttpd,ERROR] [midas.c:5495:cm_shutdown,ERROR] Client 'fedescant' not responding to 
shutdown command
Wed Jul 10 06:24:02 2019 [mhttpd,ERROR] [midas.c:5497:cm_shutdown,ERROR] Killing and Deleting client 'fedescant' 
pid 31482
Wed Jul 10 06:24:02 2019 [Logger,INFO] Client 'fedescant' on buffer 'SYSMSG' removed by cm_watchdog because 
process pid 31482 does not exist
Wed Jul 10 06:24:02 2019 [fegrifip09,INFO] Client 'fedescant' on buffer 'SYSTEM' removed by cm_watchdog because 
process pid 31482 does not exist
Wed Jul 10 06:24:03 2019 [mhttpd,INFO] Run #13456 stopped

> Wed Jul 10 06:23:58 2019 [mhttpd,ERROR] [system.c:4580:ss_recv_net_command,ERROR] timeout receiving network  command header
> Wed Jul 10 06:23:58 2019 [mhttpd,ERROR] [midas.c:10322:rpc_client_call,ERROR] call to "fedescant" on  "grsmid00.triumf.ca" RPC "rc_transition": timeout waiting for reply

We should have started debugging from here. The error messages mean: your frontend is not responding to run transition (RPC timeout).

> problem in the communication via the A3818 card from CAEN.

Yes, this has been problematic before.

K.O.

> > You can confirm that you are linking against the correct ROOT by running cmake with VERBOSE=1
> > and examine the linker command line to see what library link path is specified for ROOT.
> 
> $ make VERBOSE=1
> to see the command lines.
>

Most likely, they forgot to rerun "cmake" after installing a new ROOT. The joys of a two-step build (cmake; make).

K.O.

We installed recent mhttpd on a ubuntu machine and discovered a number of problems
with the default mhttpd settings.

We did follow the normal instructions to install and configure an apache https proxy
with a certbot certificate and password protection, this part worked ok. Big thanks
to Lars M. for providing the Ubuntu instructions for apache.

Then we started seeing errors from mhttpd about access to URLs like "manager/html" 
(google "manager/html exploit") that did not go through the proxy.

It turns out that unlike CentOS-7, Ubuntu LTS 18.04 does not run a restrictive firewall
and access to mhttpd ports 8080 and 8443 is not blocked. Then, it turns out that by 
default, the mhttpd access controls are also disabled, and it accepts http requests from 
anywhere/everywhere. Also by default, the mhttpd password is also disabled.

As result, anybody from anywhere can access mhttpd without a password.

One fix for this is to activate the mhttpd access control list by setting ODB 
/Experiment/Security/allowed hosts[0] to "localhost".

K.O.

> It turns out that unlike CentOS-7, Ubuntu LTS 18.04 does not run a restrictive firewall
> and access to mhttpd ports 8080 and 8443 is not blocked
>
> As result, anybody from anywhere can access mhttpd without a password.
> 

elogd can suffer from the same problem, but not as badly, one can connect to elogd and attempt to run 
exploits, but one cannot access elog entries without a password:

a) default configuration is to ask for a password
b) elogd almost immediately redirects to the https URL specified in the URL entry of the config file, which 
normally points to the https proxy, which also immediately asks for a password.

In the absence of firewall protection (as on Ubuntu), 
add "Interface = 127.0.0.1" to the elog config file or run elogd with "-n localhost",
per instructions at https://elog.psi.ch/elog/config.html 

K.O.

> Ubuntu LTS 18.04 does not run a restrictive firewall and access to mhttpd ports 8080 and 8443 is not 
blocked.

Clearly, the present defaults settings of mhttpd are out of date.

The best I remember our internal discussions, we have converged on the following new default settings:

- mhttpd only listens on the localhost interface
- only accepts http (not https)
- password protection is off

These settings allow one to easily test midas on a laptop or on a single-user computer.

They also happen to be the correct settings when using an https proxy (i.e. apache httpd).

If the https proxy cannot be on the same computer, (i.e. ALPHA at CERN):

- one would enable mhttpd to listen on the external network interface
- this will enable the mhttpd access controls (ODB /expt/security/mhttpd hosts/allowed hosts)
- one would allow the https proxy machine access to mhttpd by adding it's hostname to "allowed hosts".

In the case where a separate https proxy cannot be used:

- one would enable https on the external network interface
- one would have to obtain an https certificate (there is possibility of adding certbot integration to mhttpd, 
if there is demand for this)
- this will activate the mhttpd password protection, so one would have to define a username and password 
in the .htdigest file (this is done by the mongoose web server library).

I was planning to implement these changes when I update the mongoose web server library to the latest 
version (fixes a memory leak and improves/simplifies multithreading).

But maybe I should implement them sooner.

I am also thinking of adding a proxy function to mhttps (same as "ProxyPass" in apache httpd), set ODB 
/Proxy/webcam to "http://webcam_on_private_network/magic_webcam_url", and access to 
https://midas/webcam will return the data from the webcam without having to set this up in apache httpd 
(requires root access, etc).

K.O.

> - this will activate the mhttpd password protection, so one would have to define a username and password 
> in the .htdigest file (this is done by the mongoose web server library).

Actually I'm thinking since a while to have user-level access to mhttpd, similarly to elog. Each user has to log in with a unique username/password. After some time of inactivity, you're logged out. This would have 
the advantage that one knows who is active where, like when using the chat functionality in mhttpd. Or who started/stopped a run etc. This might not be necessary for simple local installations, but if you have 20 
people controlling an experiment from three different continents simultaneously, this could be beneficial. Using the elog authentication libraries, one could even forward the login process to LDAP or KERBEROS, 
so you could log in with out institutional account, and don't have to remember an additional password.

Just some food for thought.

Stefan

> > - this will activate the mhttpd password protection, so one would have to define a username and password 
> > in the .htdigest file (this is done by the mongoose web server library).
> 
> Actually I'm thinking since a while to have user-level access to mhttpd, similarly to elog.
>

With per-user login, we have the possibility to add better permissions/access controls. In past
discussions we talked about 3 levels of user access:

- read-only user: can look, but cannot affect anything
- operator: same as read-only user, but can start/stop runs, can clear alarms, can push buttons on custom pages, can cause predefined scripts to run, etc.
- root user: can do everything

Technically, this is easy to implement in the mjsonrpc library: each username will be mapped to a privilege level,
and each rpc request handler will specify minimum required privilege: odb write rpc would require root level,
run start would require operator level, odb read permitted for everybody. This will be enforced inside mhttpd.

>
> Each user has to log in with a unique username/password. After some time of inactivity, you're logged out.
>

For now, we use the password protection built into the apache httpd web server.

It is known to be secure, but it does not have the "advanced" user management functions
that we take for granted with the elog, with wiki pages, with github, etc. Missing are self-registration
with approval, password reset and recovery and so forth.

On the other hand, apache httpd is supposed to be easy to integrate with "enterprise" user management
systems, like the CERN single-sign-on system. (We did not look yet at the integration with the TRIUMF
single-sign-on system, based on Microsoft AD).

(I see the nginx web server is gaining in popularity, but I do not know what features it has
for user and password management).

The elog software does have very good user and password management, and we could bring it into midas,
if we figure out how to ensure that it is actually secure. I know a professional security audit was done
for the elog software and I know that mhttpd will not pass such an audit.

But with some extra work it is possible.

>
> This would have the advantage that one knows who is active where, like when using the chat functionality in mhttpd. Or who started/stopped a run etc. This might not be necessary for simple local installations, but if you have 20 
> people controlling an experiment from three different continents simultaneously, this could be beneficial. Using the elog authentication libraries, one could even forward the login process to LDAP or KERBEROS, 
> so you could log in with out institutional account, and don't have to remember an additional password.
> 
> Just some food for thought.
> 

Some of this food looks very good, indeed.

K.O.

Message from John M O'Donnell <odonnell@lanl.gov>

Folks,

The following might be related, if so great, if not sorry for the spam.

We had problems with MIDAS/CAEN_A3818 until two things happened:

1) CAEN found the root cause of a problem, as the A3818 and MIDAS both
used unix alarm signals, resulting in clashes.  CAEN modified the
A3818 driver to have a "no alarm" option.

2) after downloading the modified driver, edit src/a3818.c to #define
USE_MIDAS 1 somewhere near the top.

Hope this helps,

John.

> Message from John M O'Donnell <odonnell@lanl.gov>
>
> the A3818 and MIDAS both used unix alarm signals, resulting in clashes.
>

FWIW, current midas no longer uses alarm signals. See forum messages and git commits about 
removal of cm_watchdog().

K.O.

Hi,

We've been trying to run Fetest in the attempt of plotting the sine wave data on
the history page on the web server. However each time we've tried running a new
plot we have come across the error of 'no data' from the variables. In the
status page we are clearly obtaining data from the frontend and it is updating
the variable as expected in SLOW.

When setting up MIDAS we managed to produce a history plot from Fetest but are
unable to do so any longer. We did have a go at modifying the Fetest code but
created a backup before doing so and are now running the original backup.

What could be causing the Fetest data not to be showing in the history plot?

> Hi,
> 
> We've been trying to run Fetest in the attempt of plotting the sine wave data on
> the history page on the web server. However each time we've tried running a new
> plot we have come across the error of 'no data' from the variables. In the
> status page we are clearly obtaining data from the frontend and it is updating
> the variable as expected in SLOW.
> 
> When setting up MIDAS we managed to produce a history plot from Fetest but are
> unable to do so any longer. We did have a go at modifying the Fetest code but
> created a backup before doing so and are now running the original backup.
> 
> What could be causing the Fetest data not to be showing in the history plot?

Is the logger running? (this application is handling the history data).
If yes: Did you change the variable names? If yes: restart the logger.

=================================================================
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564044856, data 74.314484
time 1564044857, data 77.714600
time 1564044858, data 80.901703
time 1564044859, data 83.867058
time 1564044860, data 86.602539
time 1564044861, data 89.100655
time 1564044862, data 91.354546
time 1564044863, data 93.358040
time 1564044864, data 95.105652
time 1564044865, data 96.592583
Warning: bank RND4 has zero size
time 1564044866, data 97.814758
time 1564044867, data 98.768837
time 1564044868, data 99.452187
time 1564044869, data 99.862953
time 1564044870, data 100.000000
time 1564044872, data 99.452187
time 1564044873, data 98.768837
Warning: bank RND6 has zero size
time 1564044874, data 97.814758
Received break. Aborting...
frontend_exit!
Frontend shut down.
[lm17773@it038146 bin]$ 
===========================================================================



10:00:56.999 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

10:00:32.483 2019/07/25 [mhttpd,INFO] Run #29 stopped

09:59:10.666 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:59:07.731 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:58:13.700 2019/07/25 [Logger,INFO] Program Logger on host localhost started

09:58:12.707 2019/07/25 [Logger,INFO] Program Logger on host localhost stopped

09:57:19.136 2019/07/25 [mhttpd,INFO] Run #29 started

09:57:18.954 2019/07/25 [Logger,ERROR] [mlogger.cxx:3801:log_create_writer,ERROR] channel  requested GZIP/ZLIB compression, but ZLIB is not available

09:57:15.305 2019/07/25 [mhttpd,INFO] Run #28 stopped

09:55:30.694 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:54:34.519 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:54:16.852 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:53:59.554 2019/07/25 [fetest,INFO] Program fetest on host localhost stopped

09:47:25.932 2019/07/25 [mhttpd,INFO] Program mhttpd on host localhost started

09:47:19.863 2019/07/25 [Logger,INFO] Program Logger on host localhost started

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:6690:cm_shutdown,ERROR] Killing and Deleting client 'fetest' pid 1921

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:6687:cm_shutdown,ERROR] Cannot connect to client 'fetest' on host 'localhost', port 38595

09:47:04.116 2019/07/25 [fetest,ERROR] [midas.cxx:10497:rpc_client_connect,ERROR] cannot connect to host "localhost", port 38595: connect() returned -1, errno 111 (Connection refused)

09:47:04.116 2019/07/25 [fetest,INFO] Program fetest on host localhost started

09:47:04.116 2019/07/25 [fetest,INFO] Deleted entry '/System/Clients/1613' for client 'mhttpd' because it is not connected to ODB

09:47:04.116 2019/07/25 [fetest,INFO] Corrected 9 ODB entries

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/random/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/random/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/random/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/random/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/slow/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/slow/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/test/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/test/Statistics"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Equipment/test/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Equipment/test/Common"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Sequencer/State"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Sequencer/State"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"

09:47:04.116 2019/07/25 [fetest,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"

09:47:04.115 2019/07/25 [fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'fetest', index 2 because process pid 1921 does not exists

09:47:04.115 2019/07/25 [fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd', index 0 because process pid 1613 does not exists
===========================================================================















> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.

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

===================================================================================
[lm17773@it038146 ~]$ cd /opt/midas_software/midas/bin/
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
[fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'Logger', index 1 because process pid 22659 does not exists
[fetest,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd', index 2 because process pid 20257 does not exists
[fetest,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[fetest,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
[fetest,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed hosts"
[fetest,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd hosts/Allowed hosts"
[fetest,INFO] Removed open record flag from "/Logger/Channels/0/Settings"
[fetest,INFO] Removed exclusive access mode from "/Logger/Channels/0/Settings"
[fetest,INFO] Removed open record flag from "/Logger/Channels/0/Statistics"
[fetest,INFO] Removed exclusive access mode from "/Logger/Channels/0/Statistics"
[fetest,INFO] Removed open record flag from "/Logger/History"
[fetest,INFO] Removed exclusive access mode from "/Logger/History"
[fetest,INFO] Removed open record flag from "/Sequencer/State"
[fetest,INFO] Removed exclusive access mode from "/Sequencer/State"
[fetest,INFO] Removed open record flag from "/History/LoggerHistoryChannel"
[fetest,INFO] Removed exclusive access mode from "/History/LoggerHistoryChannel"
[fetest,INFO] Removed open record flag from "/Equipment/slow/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/slow/Variables"
[fetest,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/Events per sec."
[fetest,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/Events per sec."
[fetest,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/kBytes per sec."
[fetest,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/kBytes per sec."
[fetest,INFO] Removed open record flag from "/Equipment/Periodic/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/Periodic/Variables"
[fetest,INFO] Removed open record flag from "/Equipment/Scaler/Variables"
[fetest,INFO] Removed exclusive access mode from "/Equipment/Scaler/Variables"
[fetest,INFO] Corrected 12 ODB entries
[fetest,INFO] Deleted entry '/System/Clients/20257' for client 'mhttpd' because it is not connected to ODB
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564130782, data 91.354546
time 1564130783, data 93.358040
time 1564130784, data 95.105652
time 1564130785, data 96.592583
time 1564130786, data 97.814758
time 1564130787, data 98.768837
time 1564130788, data 99.452187
time 1564130789, data 99.862953
time 1564130790, data 100.000000
time 1564130791, data 99.862953
Warning: bank RND4 has zero size
time 1564130792, data 99.452187
time 1564130793, data 98.768837
time 1564130794, data 97.814758
time 1564130795, data 96.592583
Received break. Aborting...
frontend_exit!
Frontend shut down.
[lm17773@it038146 bin]$ 
=================================================================================



> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.

Hi, our logger was running. I have tried restarting mlogger (even though we haven't
changed variable names). We ran the following commands one after another and still no
luck with history plot. Is there anything else that could be causing these problems?

Kind regards,
Hassan 

==================================================================================

[lm17773@it038146 ~]$ cd /opt/midas_software/midas/bin/
[lm17773@it038146 bin]$ mhttpd
[mhttpd,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'mhttpd',
index 0 because process pid 20094 does not exists
[mhttpd,ERROR] [odb.cxx:1646:db_open_database,ERROR] Removed ODB client 'Logger',
index 1 because process pid 20214 does not exists
[mhttpd,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[mhttpd,INFO] Removed exclusive access mode from "/Experiment/Security/RPC
hosts/Allowed hosts"
[mhttpd,INFO] Removed open record flag from "/Experiment/Security/mhttpd hosts/Allowed
hosts"
[mhttpd,INFO] Removed exclusive access mode from "/Experiment/Security/mhttpd
hosts/Allowed hosts"
[mhttpd,INFO] Removed open record flag from "/Logger/History"
[mhttpd,INFO] Removed exclusive access mode from "/Logger/History"
[mhttpd,INFO] Removed open record flag from "/Sequencer/State"
[mhttpd,INFO] Removed exclusive access mode from "/Sequencer/State"
[mhttpd,INFO] Removed open record flag from "/History/LoggerHistoryChannel"
[mhttpd,INFO] Removed exclusive access mode from "/History/LoggerHistoryChannel"
[mhttpd,INFO] Removed open record flag from "/Equipment/slow/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/slow/Variables"
[mhttpd,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/Events per
sec."
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/Events
per sec."
[mhttpd,INFO] Removed open record flag from "/Equipment/Trigger/Statistics/kBytes per
sec."
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Trigger/Statistics/kBytes
per sec."
[mhttpd,INFO] Removed open record flag from "/Equipment/Periodic/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Periodic/Variables"
[mhttpd,INFO] Removed open record flag from "/Equipment/Scaler/Variables"
[mhttpd,INFO] Removed exclusive access mode from "/Equipment/Scaler/Variables"
[mhttpd,INFO] Corrected 10 ODB entries
[mhttpd,INFO] Deleted entry '/System/Clients/20094' for client 'mhttpd' because it is
not connected to ODB
Mongoose web server will use SSL certificate file "/home/lm17773/online/ssl_cert.pem"
Mongoose web server will use authentication realm "sampleexpt", password file
"/home/lm17773/online/htpasswd.txt"
mongoose web server is redirecting HTTP port 8080 to
https://it038146.users.bris.ac.uk:8443
mongoose web server is listening on the HTTP port 8080
mongoose web server is listening on the HTTPS port 8443
====================================================================================

[lm17773@it038146 bin]$ mlogger
[Logger,INFO] Deleted entry '/System/Clients/20214' for client 'Logger' because it is
not connected to ODB
Log     directory is /home/lm17773/online/
Data    directory is same as Log unless specified in /Logger/channels/
History directory is same as Log unless specified in /Logger/history/
ELog    directory is same as Log
SQL     database is localhost/sampleexpt/Runlog
MIDAS logger started. Stop with "!"
====================================================================================
[lm17773@it038146 bin]$ fetest
Frontend name          :     fetest
Event buffer size      :     10485760
User max event size    :     4194304
User max frag. size    :     4194304
# of events per buffer :     2

Connect to experiment sampleexpt...
OK
Init hardware...frontend_init!
Event size set to 10240 bytes
Ring buffer wait sleep 1 ms
OK
time 1564131394, data 97.814758
time 1564131395, data 96.592583
time 1564131396, data 95.105652
time 1564131397, data 93.358040
time 1564131398, data 91.354546
time 1564131399, data 89.100655
time 1564131400, data 86.602539
time 1564131401, data 83.867058
time 1564131402, data 80.901703
time 1564131403, data 77.714592
Warning: bank RND4 has zero size
time 1564131404, data 74.314484
time 1564131405, data 70.710678
time 1564131406, data 66.913063
time 1564131407, data 62.932041
====================================================================================






> > Hi,
> > 
> > We've been trying to run Fetest in the attempt of plotting the sine wave data on
> > the history page on the web server. However each time we've tried running a new
> > plot we have come across the error of 'no data' from the variables. In the
> > status page we are clearly obtaining data from the frontend and it is updating
> > the variable as expected in SLOW.
> > 
> > When setting up MIDAS we managed to produce a history plot from Fetest but are
> > unable to do so any longer. We did have a go at modifying the Fetest code but
> > created a backup before doing so and are now running the original backup.
> > 
> > What could be causing the Fetest data not to be showing in the history plot?
> 
> Is the logger running? (this application is handling the history data).
> If yes: Did you change the variable names? If yes: restart the logger.