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gfal2-plugin-sdn

This plugin hooks to gfal2 events in order to provide feedback to an SDN controller before a copy takes place.

How to build

  • Checkout the code
git clone git@github.com:cern-it-sdc-id/gfal2-sdn.git
  • Add the Data Management Clients development repository
wget http://grid-deployment.web.cern.ch/grid-deployment/dms/dmc/repos/dmc-ci-el6.repo -P /etc/yum.repos.d
  • Install the dependencies
yum install cmake gfal2-devel libcurl-devel
  • Create a directory for the build (remember to do it outside the source directory, or add it to .gitignore)
mkdir build
  • Run cmake, and compile
cd build
cmake -DCMAKE_BUILD_TYPE=DEBUG ..
make

How to test

First of all, install the complete set of gfal2 plugins, and the gfal2-util package

yum install gfal2-all gfal2-util

To make sure everything is as expected, create your X509 proxy as usual, and run

gfal-ls gsiftp://your-favourite-endpoint/path

Then, you will have to create a symlink to build/src/libgfal_plugin_sdn.so inside /usr/lib64/gfal2-plugins, and to dist/etc/gfal2.d/sdn_plugin.conf inside /etc/gfal2.d

With this setup, the SDN plugins is ready to be loaded. A very simple way of telling is to run the following copy

gfal-copy -fvv gsiftp://endpoint1/path gsiftp://endpoint2/path

-f tells gfal2 to overwrite the destination if it exists, and -vv tells gfal2-util to be a bit more verbose (-v only warnings, -vv warnings and messages, -vvv debug)

If the plugin is correctly installed and loaded, you will be able to see these lines in the output:

INFO     [gfal_module_load] plugin /usr/lib64/gfal2-plugins///libgfal_plugin_sdn.so loaded with success

Which means gfal2 saw the plugin and loaded it.

INFO     SDN event listener registered

Which means the SDN plugin injected its own event listener before starting the copy.

WARNING  Between endpoint1 and endpoint2 1 files with a total size of 123456 bytes

With is printed by the plugin before the copy starts.