API

Current State

An early prototype of the upcoming API is available at: https://helpdesk.grid5000.fr/api/rennes. Not stable, only a subset of sites are included (grenoble, bordeaux, rennes, sophia).

Enhancements are planned on a regular basis. Backwards-compatibility is not assured. Servers might be down at any time. Please refer to this page to get the main entry-point of the API as it may change.

The API is totally distributed. That is, the data is pulled from local datasets (OAR2) without the need for a centralized database.

Available Resources

API entry-point: https://helpdesk.grid5000.fr/api/rennes

The availability of an HTML format means that you can use your browser as a native API client (e.g. click on https://helpdesk.grid5000.fr/api/rennes/sites).

GET /sites [html | json]

list of sites (cached for 1 hour)

GET /nodes [html | json]

list of all nodes (cached for 90 seconds)

GET /sites/{site_uid} [html | json]

site's details

GET /sites/{site_uid}/nodes [html | json]

list of site's nodes (cached for 90 seconds)

GET /sites/{site_uid}/clusters [html | json]

list of site's clusters (cached for 1 hour)

Getting Started

Ruby client

Put this code in a g5k-client.rb file. It will output the current list of sites and, for each one, the list of its clusters and dead nodes:

 require 'rubygems'
 require 'rest_client' # sudo gem install rest-client
 require 'json' # sudo gem install json
 
 api = RestClient::Resource.new('https://helpdesk.grid5000.fr/api/rennes', 'login', 'password')
 begin
   # get the list of sites
   response = api['/sites'].get(:accept => 'application/json') # or api['/sites.json'].get
   sites = JSON.parse response
   sites.each do |site|
     puts "------------------ #{site['uid']} ------------------"
     puts "Clusters = [#{site['clusters'].map{|cluster| cluster['uid']}.join(", ")}]"
     
     # get the site's nodes. we use the URI contained in the response to locate and get new information.
     nodes = JSON.parse api["#{site['uri']}/nodes"].get(:accept => 'application/json')
     puts "Dead nodes = [#{nodes.select{|node| node['state'] == 'dead'}.collect{|node| node['uid']}.join(", ")}]"
   end
 rescue RestClient::ResourceNotFound
   puts 'Resource not found.'
 rescue RestClient::RequestTimeout
   puts 'Timeout.'
 rescue RestClient::Unauthorized
   puts 'Unauthorized.'
 rescue RestClient::RequestFailed
   puts 'Request failed.'
 rescue RestClient::ServerBrokeConnection 
   puts 'Connection broken.' 
 rescue Exception => e
   puts e.message
 end

Run with:

 ruby g5k-client.rb

Planned

• details responses
• make available the node's attributes (cpu, memory, etc.)
• choice: do we settle on using a REST architectural style ?
• XML format
• experiment submission