Module: LogStasher

Extended by:
LogStasher
Included in:
LogStasher
Defined in:
lib/logstasher.rb,
lib/logstasher/railtie.rb,
lib/logstasher/version.rb,
lib/logstasher/device/redis.rb,
lib/logstasher/action_view/log_subscriber.rb,
lib/logstasher/active_record/log_subscriber.rb,
lib/logstasher/active_support/log_subscriber.rb,
lib/logstasher/rails_ext/action_controller/base.rb,
lib/logstasher/active_support/mailer_log_subscriber.rb

Defined Under Namespace

Modules: ActionController, ActionView, ActiveRecord, ActiveSupport, Device Classes: Railtie

Constant Summary collapse

STORE_KEY = 
:logstasher_data
REQUEST_CONTEXT_KEY = 
:logstasher_request_context
VERSION = 
"0.8.6"

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#backtrace ⇒ Object

Returns the value of attribute backtrace.



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# File 'lib/logstasher.rb', line 17

def backtrace
  @backtrace
end

#controller_monkey_patch ⇒ Object

Returns the value of attribute controller_monkey_patch.



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# File 'lib/logstasher.rb', line 17

def controller_monkey_patch
  @controller_monkey_patch
end

#enabled ⇒ Object

Returns the value of attribute enabled.



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# File 'lib/logstasher.rb', line 17

def enabled
  @enabled
end

#log_controller_parameters ⇒ Object

Returns the value of attribute log_controller_parameters.



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# File 'lib/logstasher.rb', line 17

def log_controller_parameters
  @log_controller_parameters
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/logstasher.rb', line 17

def logger
  @logger
end

#logger_path ⇒ Object

Returns the value of attribute logger_path.



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# File 'lib/logstasher.rb', line 17

def logger_path
  @logger_path
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/logstasher.rb', line 17

def source
  @source
end

Instance Method Details

#add_custom_fields(&block) ⇒ Object 



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# File 'lib/logstasher.rb', line 61

def add_custom_fields(&block)
  wrapped_block = Proc.new do |fields|
    LogStasher.custom_fields.concat(LogStasher.store.keys)
    instance_exec(fields, &block)
  end
  ::ActionController::Metal.send(:define_method, :logtasher_add_custom_fields_to_payload, &wrapped_block)
  ::ActionController::Base.send(:define_method, :logtasher_add_custom_fields_to_payload, &wrapped_block)
end

#add_custom_fields_to_request_context(&block) ⇒ Object 



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# File 'lib/logstasher.rb', line 70

def add_custom_fields_to_request_context(&block)
  wrapped_block = Proc.new do |fields|
    instance_exec(fields, &block)
    LogStasher.custom_fields.concat(fields.keys)
  end
  ::ActionController::Metal.send(:define_method, :logstasher_add_custom_fields_to_request_context, &wrapped_block)
  ::ActionController::Base.send(:define_method, :logstasher_add_custom_fields_to_request_context, &wrapped_block)
end

#add_default_fields_to_payload(payload, request) ⇒ Object 



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# File 'lib/logstasher.rb', line 50

def add_default_fields_to_payload(payload, request)
  payload[:ip] = request.remote_ip
  payload[:route] = "#{request.params[:controller]}##{request.params[:action]}"
  payload[:request_id] = request.env['action_dispatch.request_id']
  self.custom_fields += [:ip, :route, :request_id]
  if self.log_controller_parameters
    payload[:parameters] = payload[:params].except(*::ActionController::LogSubscriber::INTERNAL_PARAMS)
    self.custom_fields += [:parameters]
  end
end

#add_default_fields_to_request_context(request) ⇒ Object 



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# File 'lib/logstasher.rb', line 79

def add_default_fields_to_request_context(request)
  request_context[:request_id] = request.env['action_dispatch.request_id']
end

#build_logstash_event(data, tags) ⇒ Object 



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# File 'lib/logstasher.rb', line 178

def build_logstash_event(data, tags)
  ::LogStash::Event.new(data.merge('source' => self.source, 'tags' => tags))
end

#called_as_console? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstasher.rb', line 124

def called_as_console?
  defined?(Rails::Console) && true || false
end

#called_as_rake? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstasher.rb', line 120

def called_as_rake?
  File.basename($0) == 'rake'
end

#clear_request_context ⇒ Object 



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# File 'lib/logstasher.rb', line 83

def clear_request_context
  request_context.clear
end

#configured_to_suppress_app_logs?(config) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstasher.rb', line 135

def configured_to_suppress_app_logs?(config)
  # This supports both spellings: "suppress_app_log" and "supress_app_log"
  !!(config.suppress_app_log.nil? ? config.supress_app_log : config.suppress_app_log)
end

#custom_fields ⇒ Object 



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# File 'lib/logstasher.rb', line 140

def custom_fields
  Thread.current[:logstasher_custom_fields] ||= []
end

#custom_fields=(val) ⇒ Object 



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# File 'lib/logstasher.rb', line 144

def custom_fields=(val)
  Thread.current[:logstasher_custom_fields] = val
end

#enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstasher.rb', line 210

def enabled?
  self.enabled || false
end

#log(severity, message, additional_fields = {}) ⇒ Object

Log an arbitrary message.

Usually invoked by the level-based wrapper methods defined below.

Examples

LogStasher.info("message")
LogStasher.info("message", tags:"tag1")
LogStasher.info("message", tags:["tag1", "tag2"])
LogStasher.info("message", timing:1234)
LogStasher.info(custom1:"yes", custom2:"no")



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# File 'lib/logstasher.rb', line 159

def log(severity, message, additional_fields={})
  if self.logger && self.logger.send("#{severity}?")

    data = {'level' => severity}
    if message.respond_to?(:to_hash)
      data.merge!(message.to_hash)
    else
      data['message'] = message
    end

    # tags get special handling
    tags = Array(additional_fields.delete(:tags) || 'log')

    data.merge!(additional_fields)
    self.logger << build_logstash_event(data, tags).to_json + "\n"

  end
end

#remove_existing_log_subscriptions ⇒ Object 



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# File 'lib/logstasher.rb', line 24

def remove_existing_log_subscriptions
  ::ActiveSupport::LogSubscriber.log_subscribers.each do |subscriber|
    case subscriber.class.name
      when 'ActionView::LogSubscriber'
        unsubscribe(:action_view, subscriber)
      when 'ActionController::LogSubscriber'
        unsubscribe(:action_controller, subscriber)
      when 'ActionMailer::LogSubscriber'
        unsubscribe(:action_mailer, subscriber)
      when 'ActiveRecord::LogSubscriber'
        unsubscribe(:active_record, subscriber)
    end
  end
end

#request_context ⇒ Object 



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# File 'lib/logstasher.rb', line 190

def request_context
  RequestStore.store[REQUEST_CONTEXT_KEY] ||= {}
end

#set_data_for_console ⇒ Object 



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# File 'lib/logstasher.rb', line 116

def set_data_for_console
  self.request_context['request_id'] = "#{Process.pid}" if self.called_as_console?
end

#set_data_for_rake ⇒ Object 



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# File 'lib/logstasher.rb', line 112

def set_data_for_rake
  self.request_context['request_id'] = ::Rake.application.top_level_tasks if self.called_as_rake?
end

#setup(config) ⇒ Object 



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# File 'lib/logstasher.rb', line 96

def setup(config)
  # Path instrumentation class to insert our hook
  if (! config.controller_monkey_patch && config.controller_monkey_patch != false) || config.controller_monkey_patch == true 
    require 'logstasher/rails_ext/action_controller/metal/instrumentation'
  end
  self.suppress_app_logs(config)
  self.logger_path = config.logger_path || "#{Rails.root}/log/logstash_#{Rails.env}.log"
  self.logger = config.logger || new_logger(self.logger_path)
  self.logger.level = config.log_level || Logger::WARN
  self.source = config.source unless config.source.nil?
  self.log_controller_parameters = !! config.log_controller_parameters
  self.backtrace = !! config.backtrace unless config.backtrace.nil?
  self.set_data_for_rake
  self.set_data_for_console
end

#setup_before(config) ⇒ Object 



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# File 'lib/logstasher.rb', line 87

def setup_before(config)
  require 'logstash-event'
  self.enabled = config.enabled
  LogStasher::ActiveSupport::LogSubscriber.attach_to :action_controller
  LogStasher::ActiveSupport::MailerLogSubscriber.attach_to :action_mailer
  LogStasher::ActiveRecord::LogSubscriber.attach_to :active_record
  LogStasher::ActionView::LogSubscriber.attach_to :action_view
end

#store ⇒ Object 



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# File 'lib/logstasher.rb', line 182

def store
  if RequestStore.store[STORE_KEY].nil?
    # Get each store it's own private Hash instance.
    RequestStore.store[STORE_KEY] = Hash.new { |hash, key| hash[key] = {} }
  end
  RequestStore.store[STORE_KEY]
end

#suppress_app_logs(config) ⇒ Object 



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# File 'lib/logstasher.rb', line 128

def suppress_app_logs(config)
  if configured_to_suppress_app_logs?(config)
    require 'logstasher/rails_ext/rack/logger'
    LogStasher.remove_existing_log_subscriptions
  end
end

#unsubscribe(component, subscriber) ⇒ Object 



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# File 'lib/logstasher.rb', line 39

def unsubscribe(component, subscriber)
  events = subscriber.public_methods(false).reject{ |method| method.to_s == 'call' }
  events.each do |event|
    ::ActiveSupport::Notifications.notifier.listeners_for("#{event}.#{component}").each do |listener|
      if listener.instance_variable_get('@delegate') == subscriber
        ::ActiveSupport::Notifications.unsubscribe listener
      end
    end
  end
end

#watch(event, opts = {}, &block) ⇒ Object 



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# File 'lib/logstasher.rb', line 194

def watch(event, opts = {}, &block)
  event_group = opts[:event_group] || event
  ::ActiveSupport::Notifications.subscribe(event) do |*args|
    # Calling the processing block with the Notification args and the store
    block.call(*args, store[event_group])
  end
end