Class: Rails::Rack::LogTailer

Inherits:
Object
  • Object
show all
Defined in:
railties/lib/rails/rack/log_tailer.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, log = nil) ⇒ LogTailer

Returns a new instance of LogTailer


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# File 'railties/lib/rails/rack/log_tailer.rb', line 4

def initialize(app, log = nil)
  @app = app

  path = Pathname.new(log || "#{::File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath

  @cursor = @file = nil
  if ::File.exists?(path)
    @cursor = ::File.size(path)
    @file = ::File.open(path, 'r')
  end
end

Instance Method Details

#call(env) ⇒ Object


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# File 'railties/lib/rails/rack/log_tailer.rb', line 16

def call(env)
  response = @app.call(env)
  tail!
  response
end

#tail!Object


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# File 'railties/lib/rails/rack/log_tailer.rb', line 22

def tail!
  return unless @cursor
  @file.seek @cursor

  unless @file.eof?
    contents = @file.read
    @cursor = @file.tell
    $stdout.print contents
  end
end