require "rubygems"
require "json"
require "socket"
# This script is to be ran on an Elastic Search server and returns 1 or 0 depending on
# if the system is the current primary for a cluster.
# Matt Feenstra 11/25/13
#@file = open("curl.out")
#@json = @file.read
# @json = `curl -XGET http://#{myhostname}:9200/_cluster/state`;
# myhostname = "paz02app8825"
# get my local hostname
myhostname = Socket.gethostbyname(Socket.gethostname).first
# get JSON output from ES server
@json = `curl -XGET http://#{myhostname}:9200/_cluster/state 2>/dev/null`;
# parse it into ruby hashes
@parsed = JSON.parse(@json)
retcode = 0
# return the nodes hash element
def get_hostnames
nodeshost = @parsed["nodes"]
return nodeshost
end
# return the routing_nodes->nodes hash element
def get_isprimary
nodesprimary = @parsed["routing_nodes"]["nodes"]
return nodesprimary
end
# construct new hash (hosts) to link the data elements from the
# previous 2 hashes together
#
# new hash looks like
# array
# encrypted name -> |-- hostname (string)
# -> |-- isPrimaryNode? (0/1) (boolean)
hosts = Hash.new
# somenewvar is the "nodes" hash element from the original JSON
somenewvar = get_hostnames
# search through and grab the hostname
somenewvar.each do |key,value|
hosts[key] = Array.new
hosts[key][0] = somenewvar[key]["name"]
end
# othernewvar is the "routing_nodes->nodes" hash element from original JSOn
othernewvar = get_isprimary
# search through and get the is "primary" value (yes/no)
othernewvar.each do |key,value|
othernewvar[key].each do |key2, value2|
if key2["primary"]
hosts[key][1] = 1
next
else
hosts[key][1] = 0
next
end
end
end
# Print out new hash created
# puts "---final arry---\n"
# hosts.each do |key,value|
# puts "----#{key}\n"
# puts "\t#{value}\n"
# end
# Check if my host is listed as primary in the new hash
hosts.each do |key,value|
# is primary?
if hosts[key][0] =~ /^#{myhostname}/ && hosts[key][1].to_int
print "I am Primary. (#{hosts[key][0]})\n"
retcode = 1
next
elseif hosts[key][1].to_int
print "#{hosts[key][0]} is Primary."
else
print "#{hosts[key][0]} not Primary.\n"
#print "***" + hosts[key][0] + " does not match #{myhostname}\n"
end
end
# 1 == I'm primary, 0 == seondary
print "#{retcode}\n"
retcode
