3.8.2 • Public • Published

QCG is a web graphical user interface for O2 Quality Control.

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  1. Install nodeJS >= 16.x
  • CC7: yum install https://rpm.nodesource.com/pub_16.x/el/8/x86_64/nodejs-16.9.1-1nodesource.x86_64.rpm
  • Mac: brew install node@16 ; echo 'export PATH="/usr/local/opt/node@16/bin:$PATH"' >> $HOME/.bash_profile
  • Other: https://nodejs.org/en/download/package-manager
  1. Clone the WebUi repository
git clone https://github.com/AliceO2Group/WebUi.git
  1. Install QCG
cd WebUi/QualityControl
npm ci
  1. Copy configuration file and update according to your needs (see next section):
cp config-default.js config.js

Local Configuration

In order to customize QCG, you can edit the following configuration file: WebUi/QualityControl/config.js


Attribute to define the http endpoint of the application.

Edit the http section to define a custom:

  • hostname
  • port


Attribute to define the Computer Centre DataBase (CCDB) endpoint.

Edit the ccdb section to define a custom:

  • protocol = 'http' - protocol to use when querying CCDB via HTTP API.
  • hostname = 'localhost' - hostname of the CCDB instance
  • port = '8080' - port for accessing CCDB API
  • [prefix = ''] - prefix to use for filtering on pathName
  • [cachePrefix = 'qc'] - prefix to use for building the cache of object paths from CCDB
  • [cacheRefreshRate = 120 * 1000] - interval on which the paths of objects from CCDB should be refreshed


Attribute to define if QCG is to be started as part of a QC integrated environment.

  • enabled = false

Run QCG locally

  1. (Optional) Online Mode - If you need Online Mode read this section

  2. Run QCG server

npm start
  1. Open a browser and navigate to http://localhost:8080.

    Ensure that your browser is supported.

Enable HTTPS

  • Follow these steps to request a new CERN Grid Host Certificate
  • Set up file paths to the generated key and certificate in the http section of config.js file.
  • Provide your hostname in the hostname filed of http section of config.js file.


Canvas Options via MetaData

QCG is using CCDB as storage service. When storing an object, the user can also store information on how an object should be plotted via the metadata field in CCDB. QualityControl documentation on how this can be achieved can be found here

  • drawOptions: semi-colon separated drawing options; e.g. lcolz;colz
  • displayHints: semi-colon separated hints; e.g. AP;APB

Display a QC non-standard ROOT object in QCG

QCG is able to display non-standard ROOT objects with the help of QC. More information can be found here

Online Mode

QCG is offering an optional Online Mode which allows the user to view only QC Objects that are being generated live. This will only see objects if an instance of QualityControl is running and making use of the ServiceDiscovery class.

For this, QCG is using Service Discovery capabilities of Consul. Once Consul is installed and running, update the config.js file of QCG with information regarding on what host and port Consul agent is now running.

Moreover, a refresh rate interval can be set to limit the user number of requests. If no refreshRate is provided, defaults as shown below will be used: e.g.

consul: {
  hostname: 'localhost',
  port: 8500,
  refreshRate: {
      min: 10,
      max: 120

Online mode will use an optional prefix for its queries specified in ccdb.prefix. This is to ensure the same results are provided in both Offline & Online mode.

As this functionality is optional, there will be no impact on QCG if a configuration for Consul is not provided. A simple warning message as below will be shown to the user that the configuration is missing

2020-02-28T10:19:26.110Z warn: [QualityControlModel] Consul Service: No Configuration Found

Export a layout as JSON

In order to facilitate the transition from one environment (e.g. TST) to another (e.g. PROD) while at the same time updating it, an export feature is provided.

  1. Open the layout that you wish to export
  2. Click on the top right second (from left to right) button which on hover shall display: Export layout skeleton as JSON file
  3. Following that, QCG will automatically generate a JSON file and store it in your default download location.

Import a layout from JSON

Once a layout is exported and modified as needed or created from scratch, one can import it into QCG as such:

  1. On the left sidebar, click on the small button (icon represented as cloud with arrow up) which is in line with MY LAYOUTS label.
  2. A pop-up will open which will allow you to paste your JSON structure.
  3. The pop-up will validate that the pasted value is a valid JSON.
  4. Click on Import button.
    1. If successful, a new page will be opened with your imported layout in edit mode
    2. If there is an issue, a red line with an error message will be displayed above the Import button
  5. Click Save Layout from the top right corner button.

AutoTransitioning Tabs within Layouts

To easily follow the progress of a RUN, layouts can automatically transition through the displayed tabs every few seconds. To configure:

  1. Open desired layout
  2. Click on the pencil icon button to start editing the layout
  3. On the left sidebar, configure the field Tab Auto-Change(sec): 0 (OFF), 10-600 (ON) with the desired numerical value
  4. Save

Continuous Integration Workflows

QualityControl project makes use of two workflows.

  • Checks that tests of the project are running successfully on two virtual machines:
    • ubuntu
    • macOS
  • Make sure that the proposed changes are not reducing the current code-coverage percent
  • Sends a code coverage report to CodeCov
  • Releases a new version of the project to the NPM Registry under the tag @aliceo2/qc
  • Builds a tgz file which contains an archive of the project. This can than be used for local repositories installations




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