Serf members HTTP API

serf_members_api.rb

#!/usr/local/bin/ruby
# -*- mode: ruby -*-
# vi: set ft=ruby :
# encoding: UTF-8
#
# Get all members:
# curl "localhost:3737/api/members"
#
# Get members alive:
# curl "localhost:3737/api/members?status=alive"
#
# Get members status is alive and tag foo is bar:
# curl "localhost:3737/api/members?status=alive&foo=bar"
#
# Get member by name:
# curl "localhost:3737/api/members/<node-name>"
#
require 'sinatra'
require 'json'

set :port, 3737
set :protection, :except => :json_csrf

if `which serf` == ""
    raise "Serf exec not found."
end

def serf(args)
    if defined?(args)
        begin
            return JSON.parse(`serf #{args.to_s} -format json`)
        rescue Exception => error
            return { 'error' => error }
        end
    else
        return { 'error' => 'args not received' }
    end
end

before do
   content_type :json
   headers 'Access-Control-Allow-Origin'  => '*',
           'Access-Control-Allow-Methods' => ['GET']
end

get '/api' do
    200
end

get '/api/members' do
    query = ""

    if defined?(params)
        # core attribs
        ["name", "status"].each do |atrib|
            query += (params[atrib]) ? "-#{atrib}=#{params[atrib]}\s" : ""
        end

        # tags available on nodes
        ["foo", "another", "etc"].each do |tag|
            query += (params[tag]) ? "-tag=#{tag}=#{params[tag]}\s" : ""
        end
    end

    serf("members #{query}").to_json
end

get '/api/members/:node' do
    serf("members -name=#{params[:node]}").to_json
end