Class: LogStash::Inputs::Unix

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/inputs/unix.rb

Overview

Read events over a UNIX socket.

Like ‘stdin` and `file` inputs, each event is assumed to be one line of text.

Can either accept connections from clients or connect to a server, depending on ‘mode`.

Defined Under Namespace

Classes: Interrupted

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Unix

Returns a new instance of Unix.



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# File 'lib/logstash/inputs/unix.rb', line 35

def initialize(*args)
  super(*args)
end

Instance Method Details

#register ⇒ Object 



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# File 'lib/logstash/inputs/unix.rb', line 40

def register
  require "socket"
  require "timeout"

  if server?
    @logger.info("Starting unix input listener", :address => "#{@path}", :force_unlink => "#{@force_unlink}")
    begin
      @server_socket = UNIXServer.new(@path)
    rescue Errno::EADDRINUSE, IOError
      if @force_unlink
        File.unlink(@path)
        begin
          @server_socket = UNIXServer.new(@path)
          return
        rescue Errno::EADDRINUSE, IOError
          @logger.error("!!!Could not start UNIX server: Address in use",
                        :path => @path)
          raise
        end
      end
      @logger.error("Could not start UNIX server: Address in use",
                    :path => @path)
      raise
    end
  end
end

#run(output_queue) ⇒ Object 



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# File 'lib/logstash/inputs/unix.rb', line 112

def run(output_queue)
  if server?
    @thread = Thread.current
    @client_threads = []
    loop do
      # Start a new thread for each connection.
      begin
        @client_threads << Thread.start(@server_socket.accept) do |s|
          # TODO(sissel): put this block in its own method.

          @logger.debug("Accepted connection",
                        :server => "#{@path}")
          begin
            handle_socket(s, output_queue)
          rescue Interrupted
            s.close rescue nil
          end
        end # Thread.start
      rescue IOError, Interrupted
        if @interrupted
          # Intended shutdown, get out of the loop
          @server_socket.close
          @client_threads.each do |thread|
            thread.raise(IOError.new)
          end
          break
        else
          # Else it was a genuine IOError caused by something else, so propagate it up..
          raise
        end
      end
    end # loop
  else
    loop do
      client_socket = UNIXSocket.new(@path)
      client_socket.instance_eval { class << self; include ::LogStash::Util::SocketPeer end }
      @logger.debug("Opened connection", :client => @path)
      handle_socket(client_socket, output_queue)
    end # loop
  end
end

#teardown ⇒ Object 



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# File 'lib/logstash/inputs/unix.rb', line 155

def teardown
  if server?
    File.unlink(@path)
    @interrupted = true
    @thread.raise(Interrupted.new)
  end
end