Class: LogStash::Plugin

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/plugin.rb

Constant Summary collapse

NL = 
"\n"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = nil) ⇒ Plugin

Returns a new instance of Plugin.



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# File 'lib/logstash/plugin.rb', line 25

def initialize(params=nil)
  @params = params
  @logger = Cabin::Channel.get(LogStash)
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/logstash/plugin.rb', line 9

def logger
  @logger
end

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/logstash/plugin.rb', line 8

def params
  @params
end

Class Method Details

.lookup(type, name) ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 126

def self.lookup(type, name)
  path = "logstash/#{type}s/#{name}"

  # first check if plugin already exists in namespace and continue to next step if not
  begin
    return namespace_lookup(type, name)
  rescue NameError
    logger.debug("Plugin not defined in namespace, checking for plugin file", :type => type, :name => name, :path => path)
  end

  # try to load the plugin file. ex.: lookup("filter", "grok") will require logstash/filters/grok
  require(path)

  # check again if plugin is now defined in namespace after the require
  namespace_lookup(type, name)
rescue LoadError, NameError => e
  raise(LogStash::PluginLoadingError, I18n.t("logstash.pipeline.plugin-loading-error", :type => type, :name => name, :path => path, :error => e.to_s))
end

Instance Method Details

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/plugin.rb', line 20

def eql?(other)
  self.class.name == other.class.name && @params == other.params
end

#finished ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 52

def finished
  # TODO(sissel): I'm not sure what I had planned for this shutdown_queue
  # thing
  if @shutdown_queue
    @logger.info("Sending shutdown event to agent queue", :plugin => self)
    @shutdown_queue << self
  end

  if @plugin_state != :finished
    @logger.info("Plugin is finished", :plugin => self)
    @plugin_state = :finished
  end
end

#finished? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/plugin.rb', line 81

def finished?
  return @plugin_state == :finished
end

#hash ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 14

def hash
  params.hash ^
  self.class.name.hash
end

#inspect ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 113

def inspect
  if !@params.nil?
    description = @params
      .reject { |k, v| v.nil? || (v.respond_to?(:empty?) && v.empty?) }
      .collect { |k, v| "#{k}=>#{v.inspect}" }
    return "<#{self.class.name} #{description.join(", ")}>"
  else
    return "<#{self.class.name} --->"
  end
end

#reload ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 76

def reload
  # Do nothing by default
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/plugin.rb', line 86

def running?
  return @plugin_state != :finished
end

#shutdown(queue) ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 34

def shutdown(queue)
  # By default, shutdown is assumed a no-op for all plugins.
  # If you need to take special efforts to shutdown (like waiting for
  # an operation to complete, etc)
  teardown
  @logger.info("Received shutdown signal", :plugin => self)

  @shutdown_queue = queue
  if @plugin_state == :finished
    finished
  else
    @plugin_state = :terminating
  end
end

#teardown ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 69

def teardown
  # nothing by default
  finished
end

#terminating? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/plugin.rb', line 91

def terminating?
  return @plugin_state == :terminating
end

#to_s ⇒ Object 



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# File 'lib/logstash/plugin.rb', line 96

def to_s
  return "#{self.class.name}: #{@params}"
end