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Note that we have proxied both the MIDAS server and the THttpServer through APACHE in this case. So, for instance, the apache ssl.conf file was tweaked to include the following proxy
Note that we have proxied both the MIDAS server and the THttpServer through APACHE in this case. So, for instance, the apache ssl.conf file was tweaked to include the following proxy :
Revision as of 18:33, 25 January 2017
The rootana analyzer has a command line option to allow the initialization of a THttpServer. For instance, you can try doing
with the programs in rootana/examples; this start the program with an instance of the THttpServer on port 8088.
We have a test MIDAS instance available here (username/pwd: testdaq/testdaq)
The default browser (the one that ROOT provides) for the rootana histograms is available here
Note that we have proxied both the MIDAS server and the THttpServer through APACHE in this case. So, for instance, the apache ssl.conf file was tweaked to include the following proxy instructions:
Redirect permanent /rootana http://midastestdaq.triumf.ca/rootana/ ProxyPass /rootana/ http://midastestdaq.triumf.ca:8088/ retry=1 ProxyPass / http://midastestdaq.triumf.ca:8081/ retry=1
Custom web display
Features of this webdisplay include
- The ability to overlay multiple histograms or show two histograms side-by-side.
- The webpage is configured by a JSON configuration file called generic_rootana_setup.json; this defines which histograms to create buttons to look at. The example configuration file shows how to define histograms that have multiple copies for different channels, as well as stand-alone histograms.
- The ability to send reset commands back to the rootana program. Note that this resets the histograms for everyone, which may not be an annoying feature.
- The 1D histograms are implemented using the dygraphs plotting package, whereas the 2D histograms are plotted using plotly . I did not make a lot of effort comparing the different plotting packages; these just seemed to work well enough.
- When requesting multiple histograms to overlay or plot side-by-side, all the histograms are requested in a single AJAX transfer. This ensures that you are looking at histograms that are updated at the same time, important when, for instance, plotting waveforms from a particular event.
- All transfers are done with asynchronous Promise-style AJAX transfers.
- The webpage currently only works for looking at the histograms online. You could run rootana on a file and use this webpage to look at the plots; but I don't know how to get the webpage to tell rootana to only process one event at a time, so this isn't so useful. But maybe the idea of using a webpage to look at a particular file doesn't make much sense anyway.
- When you pause the webpage, you can't switch between different channels, display types, etc. That is because the webpage only has the information for the histogram that it is currently plotting; it doesn't have information for any other histograms, so can't show them without un-pausing.
I guess that these problems are probably problems that we also had with roody (not sure about i). They may be problems that are inherent to trying to decouple the generation of the histograms from their display.