Module: Elasticsearch::Extensions::Test::Cluster
Overview
A convenience Ruby class for starting and stopping a separate testing in-memory cluster, to not depend on – and not mess up – <localhost:9200>.
Constant Summary collapse
- @@number_of_nodes =
(ENV['TEST_CLUSTER_NODES'] || 2).to_i
Instance Method Summary collapse
-
#__get_cluster_health(port = 9250) ⇒ Object
private
Tries to load cluster health information.
-
#__print_cluster_info(port) ⇒ Object
private
Print information about the cluster on STDOUT.
-
#__wait_for_status(status = 'green', port = 9250, timeout = 30) ⇒ Object
private
Blocks the process and waits for the cluster to be in a “green” state.
-
#running?(arguments = {}) ⇒ Boolean
Returns true when a specific test node is running within the cluster.
-
#start(arguments = {}) ⇒ Object
Starts a cluster.
-
#stop(arguments = {}) ⇒ Object
Stop the cluster.
-
#wait_for_green(port = 9250, timeout = 60) ⇒ Object
Waits until the cluster is green and prints information.
Instance Method Details
#__get_cluster_health(port = 9250) ⇒ Object
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Tries to load cluster health information
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 277 def __get_cluster_health(port=9250) uri = URI("http://localhost:#{port}/_cluster/health") if response = Net::HTTP.get(uri) rescue nil return JSON.parse(response) end end |
#__print_cluster_info(port) ⇒ Object
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Print information about the cluster on STDOUT
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 251 def __print_cluster_info(port) health = JSON.parse(Net::HTTP.get(URI("http://localhost:#{port}/_cluster/health"))) nodes = JSON.parse(Net::HTTP.get(URI("http://localhost:#{port}/_nodes/process,http"))) master = JSON.parse(Net::HTTP.get(URI("http://localhost:#{port}/_cluster/state")))['master_node'] puts "\n", ('-'*80).ansi(:faint), 'Cluster: '.ljust(20).ansi(:faint) + health['cluster_name'].to_s.ansi(:faint), 'Status: '.ljust(20).ansi(:faint) + health['status'].to_s.ansi(:faint), 'Nodes: '.ljust(20).ansi(:faint) + health['number_of_nodes'].to_s.ansi(:faint) nodes['nodes'].each do |id, info| m = id == master ? '*' : '+' puts ''.ljust(20) + "#{m} ".ansi(:faint) + "#{info['name'].ansi(:bold)} ".ansi(:faint) + "| version: #{info['version'] rescue 'N/A'}, ".ansi(:faint) + "pid: #{info['process']['id'] rescue 'N/A'}, ".ansi(:faint) + "address: #{info['http']['bound_address'] rescue 'N/A'}".ansi(:faint) end end |
#__wait_for_status(status = 'green', port = 9250, timeout = 30) ⇒ Object
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Blocks the process and waits for the cluster to be in a “green” state.
Prints information about the cluster on STDOUT if the cluster is available.
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 221 def __wait_for_status(status='green', port=9250, timeout=30) uri = URI("http://localhost:#{port}/_cluster/health?wait_for_status=#{status}") Timeout::timeout(timeout) do loop do response = begin JSON.parse(Net::HTTP.get(uri)) rescue Exception => e puts e.inspect if ENV['DEBUG'] nil end puts response.inspect if ENV['DEBUG'] if response && response['status'] == status && ( @@number_of_nodes.nil? || @@number_of_nodes == response['number_of_nodes'].to_i ) __print_cluster_info(port) and break end print '.'.ansi(:faint) sleep 1 end end return true end |
#running?(arguments = {}) ⇒ Boolean
Returns true when a specific test node is running within the cluster.
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 185 def running?(arguments={}) port = arguments[:on] || (ENV['TEST_CLUSTER_PORT'] || 9250).to_i cluster_name = arguments[:as] || ENV['TEST_CLUSTER_NAME'] || 'elasticsearch_test' if cluster_health = Timeout::timeout(0.25) { __get_cluster_health(port) } rescue nil return cluster_health['cluster_name'] == cluster_name && \ cluster_health['number_of_nodes'] == @@number_of_nodes end return false end |
#start(arguments = {}) ⇒ Object
Starts a cluster
Launches the specified number of nodes in test-suitable configuration by default and prints information about the cluster – unless this specific cluster is running already.
Use the Cluster.stop command with the same arguments to stop this cluster.
You can also use environment variables to set these options.
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 68 def start(arguments={}) @@number_of_nodes = (ENV['TEST_CLUSTER_NODES'] || arguments[:nodes] || 2).to_i arguments[:command] ||= ENV['TEST_CLUSTER_COMMAND'] || 'elasticsearch' arguments[:port] ||= (ENV['TEST_CLUSTER_PORT'] || 9250).to_i arguments[:cluster_name] ||= (ENV['TEST_CLUSTER_NAME'] || 'elasticsearch_test').chomp arguments[:path_data] ||= ENV['TEST_CLUSTER_DATA'] || '/tmp' arguments[:es_params] ||= ENV['TEST_CLUSTER_PARAMS'] || '' arguments[:path_work] ||= '/tmp' arguments[:node_name] ||= 'node' arguments[:timeout] ||= (ENV['TEST_CLUSTER_TIMEOUT'] || 30).to_i # Make sure `cluster_name` is not dangerous if arguments[:cluster_name] =~ /^[\/\\]?$/ raise ArgumentError, "The `cluster_name` parameter cannot be empty string or a slash" end if running? :on => arguments[:port], :as => arguments[:cluster_name] print "[!] Elasticsearch cluster already running".ansi(:red) wait_for_green(arguments[:port], arguments[:timeout]) return false end # Wipe out data for this cluster name FileUtils.rm_rf "#{arguments[:path_data]}/#{arguments[:cluster_name]}" print "Starting ".ansi(:faint) + @@number_of_nodes.to_s.ansi(:bold, :faint) + " Elasticsearch nodes..".ansi(:faint) pids = [] @@number_of_nodes.times do |n| n += 1 pid = Process.spawn <<-COMMAND #{arguments[:command]} \ -D es.foreground=yes \ -D es.cluster.name=#{arguments[:cluster_name]} \ -D es.node.name=#{arguments[:node_name]}-#{n} \ -D es.http.port=#{arguments[:port].to_i + (n-1)} \ -D es.path.data=#{arguments[:path_data]} \ -D es.path.work=#{arguments[:path_work]} \ -D es.cluster.routing.allocation.disk.threshold_enabled=false \ -D es.network.host=0.0.0.0 \ -D es.discovery.zen.ping.multicast.enabled=true \ -D es.script.disable_dynamic=false \ -D es.node.test=true \ -D es.node.bench=true \ -D es.logger.level=DEBUG \ #{arguments[:es_params]} \ > /dev/null COMMAND Process.detach pid pids << pid end # Check for proceses running if `ps -p #{pids.join(' ')}`.split("\n").size < @@number_of_nodes+1 STDERR.puts "", "[!!!] Process failed to start (see output above)".ansi(:red) exit(1) end wait_for_green(arguments[:port], arguments[:timeout]) return true end |
#stop(arguments = {}) ⇒ Object
Stop the cluster.
Fetches the PID numbers from “Nodes Info” API and terminates matching nodes.
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 147 def stop(arguments={}) arguments[:port] ||= (ENV['TEST_CLUSTER_PORT'] || 9250).to_i nodes = begin JSON.parse(Net::HTTP.get(URI("http://localhost:#{arguments[:port]}/_nodes/?process"))) rescue Exception => e STDERR.puts "[!] Exception raised when stopping the cluster: #{e.inspect}".ansi(:red) nil end return false if nodes.nil? or nodes.empty? pids = nodes['nodes'].map { |id, info| info['process']['id'] } unless pids.empty? print "\nStopping Elasticsearch nodes... ".ansi(:faint) pids.each_with_index do |pid, i| begin print "stopped PID #{pid}. ".ansi(:green) if Process.kill 'INT', pid rescue Exception => e print "[#{e.class}] PID #{pid} not found. ".ansi(:red) end end puts else false end return pids end |
#wait_for_green(port = 9250, timeout = 60) ⇒ Object
Waits until the cluster is green and prints information
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# File 'lib/elasticsearch/extensions/test/cluster.rb', line 205 def wait_for_green(port=9250, timeout=60) __wait_for_status('green', port, timeout) end |