This came from elasticsearch/logstash at cf2242170011fbf2d264ae876601…

…92754697671a

.gitignore

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+*.gem
+Gemfile.lock
+.bundle
+vendor

Gemfile

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+source 'https://rubygems.org'
+gem 'rake'
+gem 'gem_publisher'
+gem 'archive-tar-minitar'

Rakefile

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+@files=[]
+
+task :default do
+  system("rake -T")
+end
+

lib/logstash/inputs/file.rb

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+# encoding: utf-8
+require "logstash/inputs/base"
+require "logstash/namespace"
+
+require "pathname"
+require "socket" # for Socket.gethostname
+
+# Stream events from files.
+#
+# By default, each event is assumed to be one line. If you would like
+# to join multiple log lines into one event, you'll want to use the
+# multiline codec.
+#
+# Files are followed in a manner similar to "tail -0F". File rotation
+# is detected and handled by this input.
+class LogStash::Inputs::File < LogStash::Inputs::Base
+  config_name "file"
+  milestone 2
+
+  # TODO(sissel): This should switch to use the 'line' codec by default
+  # once file following
+  default :codec, "plain"
+
+  # The path(s) to the file(s) to use as an input.
+  # You can use globs here, such as `/var/log/*.log`
+  # Paths must be absolute and cannot be relative.
+  #
+  # You may also configure multiple paths. See an example
+  # on the [Logstash configuration page](configuration#array).
+  config :path, :validate => :array, :required => true
+
+  # Exclusions (matched against the filename, not full path). Globs
+  # are valid here, too. For example, if you have
+  #
+  #     path => "/var/log/*"
+  #
+  # You might want to exclude gzipped files:
+  #
+  #     exclude => "*.gz"
+  config :exclude, :validate => :array
+
+  # How often we stat files to see if they have been modified. Increasing
+  # this interval will decrease the number of system calls we make, but
+  # increase the time to detect new log lines.
+  config :stat_interval, :validate => :number, :default => 1
+
+  # How often we expand globs to discover new files to watch.
+  config :discover_interval, :validate => :number, :default => 15
+
+  # Where to write the sincedb database (keeps track of the current
+  # position of monitored log files). The default will write
+  # sincedb files to some path matching "$HOME/.sincedb*"
+  config :sincedb_path, :validate => :string
+
+  # How often (in seconds) to write a since database with the current position of
+  # monitored log files.
+  config :sincedb_write_interval, :validate => :number, :default => 15
+
+  # Choose where Logstash starts initially reading files: at the beginning or
+  # at the end. The default behavior treats files like live streams and thus
+  # starts at the end. If you have old data you want to import, set this
+  # to 'beginning'
+  #
+  # This option only modifies "first contact" situations where a file is new
+  # and not seen before. If a file has already been seen before, this option
+  # has no effect.
+  config :start_position, :validate => [ "beginning", "end"], :default => "end"
+
+  public
+  def register
+    require "addressable/uri"
+    require "filewatch/tail"
+    require "digest/md5"
+    @logger.info("Registering file input", :path => @path)
+
+    @tail_config = {
+      :exclude => @exclude,
+      :stat_interval => @stat_interval,
+      :discover_interval => @discover_interval,
+      :sincedb_write_interval => @sincedb_write_interval,
+      :logger => @logger,
+    }
+
+    @path.each do |path|
+      if Pathname.new(path).relative?
+        raise ArgumentError.new("File paths must be absolute, relative path specified: #{path}")
+      end
+    end
+
+    if @sincedb_path.nil?
+      if ENV["SINCEDB_DIR"].nil? && ENV["HOME"].nil?
+        @logger.error("No SINCEDB_DIR or HOME environment variable set, I don't know where " \
+                      "to keep track of the files I'm watching. Either set " \
+                      "HOME or SINCEDB_DIR in your environment, or set sincedb_path in " \
+                      "in your Logstash config for the file input with " \
+                      "path '#{@path.inspect}'")
+        raise # TODO(sissel): HOW DO I FAIL PROPERLY YO
+      end
+
+      #pick SINCEDB_DIR if available, otherwise use HOME
+      sincedb_dir = ENV["SINCEDB_DIR"] || ENV["HOME"]
+
+      # Join by ',' to make it easy for folks to know their own sincedb
+      # generated path (vs, say, inspecting the @path array)
+      @sincedb_path = File.join(sincedb_dir, ".sincedb_" + Digest::MD5.hexdigest(@path.join(",")))
+
+      # Migrate any old .sincedb to the new file (this is for version <=1.1.1 compatibility)
+      old_sincedb = File.join(sincedb_dir, ".sincedb")
+      if File.exists?(old_sincedb)
+        @logger.info("Renaming old ~/.sincedb to new one", :old => old_sincedb,
+                     :new => @sincedb_path)
+        File.rename(old_sincedb, @sincedb_path)
+      end
+
+      @logger.info("No sincedb_path set, generating one based on the file path",
+                   :sincedb_path => @sincedb_path, :path => @path)
+    end
+
+    @tail_config[:sincedb_path] = @sincedb_path
+
+    if @start_position == "beginning"
+      @tail_config[:start_new_files_at] = :beginning
+    end
+  end # def register
+
+  public
+  def run(queue)
+    @tail = FileWatch::Tail.new(@tail_config)
+    @tail.logger = @logger
+    @path.each { |path| @tail.tail(path) }
+    hostname = Socket.gethostname
+
+    @tail.subscribe do |path, line|
+      @logger.debug? && @logger.debug("Received line", :path => path, :text => line)
+      @codec.decode(line) do |event|
+        decorate(event)
+        event["host"] = hostname if !event.include?("host")
+        event["path"] = path
+        queue << event
+      end
+    end
+    finished
+  end # def run
+
+  public
+  def teardown
+    @tail.sincedb_write
+    @tail.quit
+  end # def teardown
+end # class LogStash::Inputs::File

logstash-input-file.gemspec

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+Gem::Specification.new do |s|
+
+  s.name            = 'logstash-input-file'
+  s.version         = '0.1.0'
+  s.licenses        = ['Apache License (2.0)']
+  s.summary         = "Stream events from files."
+  s.description     = "Stream events from files."
+  s.authors         = ["Elasticsearch"]
+  s.email           = '[email protected]'
+  s.homepage        = "http://logstash.net/"
+  s.require_paths = ["lib"]
+
+  # Files
+  s.files = `git ls-files`.split($\)+::Dir.glob('vendor/*')
+
+  # Tests
+  s.test_files = s.files.grep(%r{^(test|spec|features)/})
+
+  # Special flag to let us know this is actually a logstash plugin
+  s.metadata = { "logstash_plugin" => "true", "group" => "input" }
+
+  # Gem dependencies
+  s.add_runtime_dependency 'logstash', '>= 1.4.0', '< 2.0.0'
+
+  s.add_runtime_dependency 'addressable'
+  s.add_runtime_dependency 'filewatch', ['0.5.1']
+
+end
+

rakelib/publish.rake

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+require "gem_publisher"
+
+desc "Publish gem to RubyGems.org"
+task :publish_gem do |t|
+  gem_file = Dir.glob(File.expand_path('../*.gemspec',File.dirname(__FILE__))).first
+  gem = GemPublisher.publish_if_updated(gem_file, :rubygems)
+  puts "Published #{gem}" if gem
+end
+

rakelib/vendor.rake

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+require "net/http"
+require "uri"
+require "digest/sha1"
+
+def vendor(*args)
+  return File.join("vendor", *args)
+end
+
+directory "vendor/" => ["vendor"] do |task, args|
+  mkdir task.name
+end
+
+def fetch(url, sha1, output)
+
+  puts "Downloading #{url}"
+  actual_sha1 = download(url, output)
+
+  if actual_sha1 != sha1
+    fail "SHA1 does not match (expected '#{sha1}' but got '#{actual_sha1}')"
+  end
+end # def fetch
+
+def file_fetch(url, sha1)
+  filename = File.basename( URI(url).path )
+  output = "vendor/#{filename}"
+  task output => [ "vendor/" ] do
+    begin
+      actual_sha1 = file_sha1(output)
+      if actual_sha1 != sha1
+        fetch(url, sha1, output)
+      end
+    rescue Errno::ENOENT
+      fetch(url, sha1, output)
+    end
+  end.invoke
+
+  return output
+end
+
+def file_sha1(path)
+  digest = Digest::SHA1.new
+  fd = File.new(path, "r")
+  while true
+    begin
+      digest << fd.sysread(16384)
+    rescue EOFError
+      break
+    end
+  end
+  return digest.hexdigest
+ensure
+  fd.close if fd
+end
+
+def download(url, output)
+  uri = URI(url)
+  digest = Digest::SHA1.new
+  tmp = "#{output}.tmp"
+  Net::HTTP.start(uri.host, uri.port, :use_ssl => (uri.scheme == "https")) do |http|
+    request = Net::HTTP::Get.new(uri.path)
+    http.request(request) do |response|
+      fail "HTTP fetch failed for #{url}. #{response}" if [200, 301].include?(response.code)
+      size = (response["content-length"].to_i || -1).to_f
+      count = 0
+      File.open(tmp, "w") do |fd|
+        response.read_body do |chunk|
+          fd.write(chunk)
+          digest << chunk
+          if size > 0 && $stdout.tty?
+            count += chunk.bytesize
+            $stdout.write(sprintf("\r%0.2f%%", count/size * 100))
+          end
+        end
+      end
+      $stdout.write("\r      \r") if $stdout.tty?
+    end
+  end
+
+  File.rename(tmp, output)
+
+  return digest.hexdigest
+rescue SocketError => e
+  puts "Failure while downloading #{url}: #{e}"
+  raise
+ensure
+  File.unlink(tmp) if File.exist?(tmp)
+end # def download
+
+def untar(tarball, &block)
+  require "archive/tar/minitar"
+  tgz = Zlib::GzipReader.new(File.open(tarball))
+  # Pull out typesdb
+  tar = Archive::Tar::Minitar::Input.open(tgz)
+  tar.each do |entry|
+    path = block.call(entry)
+    next if path.nil?
+    parent = File.dirname(path)
+
+    mkdir_p parent unless File.directory?(parent)
+
+    # Skip this file if the output file is the same size
+    if entry.directory?
+      mkdir path unless File.directory?(path)
+    else
+      entry_mode = entry.instance_eval { @mode } & 0777
+      if File.exists?(path)
+        stat = File.stat(path)
+        # TODO(sissel): Submit a patch to archive-tar-minitar upstream to
+        # expose headers in the entry.
+        entry_size = entry.instance_eval { @size }
+        # If file sizes are same, skip writing.
+        next if stat.size == entry_size && (stat.mode & 0777) == entry_mode
+      end
+      puts "Extracting #{entry.full_name} from #{tarball} #{entry_mode.to_s(8)}"
+      File.open(path, "w") do |fd|
+        # eof? check lets us skip empty files. Necessary because the API provided by
+        # Archive::Tar::Minitar::Reader::EntryStream only mostly acts like an
+        # IO object. Something about empty files in this EntryStream causes
+        # IO.copy_stream to throw "can't convert nil into String" on JRuby
+        # TODO(sissel): File a bug about this.
+        while !entry.eof?
+          chunk = entry.read(16384)
+          fd.write(chunk)
+        end
+          #IO.copy_stream(entry, fd)
+      end
+      File.chmod(entry_mode, path)
+    end
+  end
+  tar.close
+  File.unlink(tarball) if File.file?(tarball)
+end # def untar
+
+def ungz(file)
+
+  outpath = file.gsub('.gz', '')
+  tgz = Zlib::GzipReader.new(File.open(file))
+  begin
+    File.open(outpath, "w") do |out|
+      IO::copy_stream(tgz, out)
+    end
+    File.unlink(file)
+  rescue
+    File.unlink(outpath) if File.file?(outpath)
+   raise
+  end
+  tgz.close
+end
+
+desc "Process any vendor files required for this plugin"
+task "vendor" do |task, args|
+
+  @files.each do |file| 
+    download = file_fetch(file['url'], file['sha1'])
+    if download =~ /.tar.gz/
+      prefix = download.gsub('.tar.gz', '').gsub('vendor/', '')
+      untar(download) do |entry|
+        if !file['files'].nil?
+          next unless file['files'].include?(entry.full_name.gsub(prefix, ''))
+          out = entry.full_name.split("/").last
+        end
+        File.join('vendor', out)
+      end
+    elsif download =~ /.gz/
+      ungz(download)
+    end
+  end
+
+end