Class: Fluent::ElasticsearchOutput

Inherits:
ObjectBufferedOutput
  • Object
show all
Includes:
ElasticsearchIndexTemplate
Defined in:
lib/fluent/plugin/out_elasticsearch.rb

Direct Known Subclasses

ElasticsearchOutputDynamic

Defined Under Namespace

Classes: ConnectionFailure

Constant Summary collapse

BODY_DELIMITER = 
"\n".freeze
UPDATE_OP = 
"update".freeze
UPSERT_OP = 
"upsert".freeze
CREATE_OP = 
"create".freeze
INDEX_OP = 
"index".freeze
ID_FIELD = 
"_id".freeze
TIMESTAMP_FIELD = 
"@timestamp".freeze

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ElasticsearchOutput

Returns a new instance of ElasticsearchOutput.



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 67

def initialize
  super
end

Instance Method Details

#append_record_to_messages(op, meta, header, record, msgs) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 221

def append_record_to_messages(op, meta, header, record, msgs)
  case op
  when UPDATE_OP, UPSERT_OP
    if meta.has_key?(ID_FIELD)
      header[UPDATE_OP] = meta
      msgs << @dump_proc.call(header) << BODY_DELIMITER
      msgs << @dump_proc.call(update_body(record, op)) << BODY_DELIMITER
    end
  when CREATE_OP
    if meta.has_key?(ID_FIELD)
      header[CREATE_OP] = meta
      msgs << @dump_proc.call(header) << BODY_DELIMITER
      msgs << @dump_proc.call(record) << BODY_DELIMITER
    end
  when INDEX_OP
    header[INDEX_OP] = meta
    msgs << @dump_proc.call(header) << BODY_DELIMITER
    msgs << @dump_proc.call(record) << BODY_DELIMITER
  end
end

#client ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 143

def client
  @_es ||= begin
    excon_options = { client_key: @client_key, client_cert: @client_cert, client_key_pass: @client_key_pass }
    adapter_conf = lambda {|f| f.adapter :excon, excon_options }
    transport = Elasticsearch::Transport::Transport::HTTP::Faraday.new(get_connection_options.merge(
                                                                        options: {
                                                                          reload_connections: @reload_connections,
                                                                          reload_on_failure: @reload_on_failure,
                                                                          resurrect_after: @resurrect_after,
                                                                          retry_on_failure: 5,
                                                                          transport_options: {
                                                                            headers: { 'Content-Type' => 'application/json' },
                                                                            request: { timeout: @request_timeout },
                                                                            ssl: { verify: @ssl_verify, ca_file: @ca_file }
                                                                          }
                                                                        }), &adapter_conf)
    es = Elasticsearch::Client.new transport: transport

    begin
      raise ConnectionFailure, "Can not reach Elasticsearch cluster (#{connection_options_description})!" unless es.ping
    rescue *es.transport.host_unreachable_exceptions => e
      raise ConnectionFailure, "Can not reach Elasticsearch cluster (#{connection_options_description})! #{e.message}"
    end

    log.info "Connection opened to Elasticsearch cluster => #{connection_options_description}"
    es
  end
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 71

def configure(conf)
  super
  @time_parser = create_time_parser

  if @remove_keys
    @remove_keys = @remove_keys.split(/\s*,\s*/)
  end

  if @target_index_key && @target_index_key.is_a?(String)
    @target_index_key = @target_index_key.split '.'
  end

  if @target_type_key && @target_type_key.is_a?(String)
    @target_type_key = @target_type_key.split '.'
  end

  if @remove_keys_on_update && @remove_keys_on_update.is_a?(String)
    @remove_keys_on_update = @remove_keys_on_update.split ','
  end

  if @template_name && @template_file
    template_install(@template_name, @template_file)
  elsif @templates
    templates_hash_install (@templates)
  end

  @meta_config_map = create_meta_config_map

  begin
    require 'oj'
    @dump_proc = Oj.method(:dump)
  rescue LoadError
    @dump_proc = Yajl.method(:dump)
  end
end

#connection_options_description ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 205

def connection_options_description
  get_connection_options[:hosts].map do |host_info|
    attributes = host_info.dup
    attributes[:password] = 'obfuscated' if attributes.has_key?(:password)
    attributes.inspect
  end.join(', ')
end

#create_meta_config_map ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 107

def create_meta_config_map
  result = []
  result << [@id_key, '_id'] if @id_key
  result << [@parent_key, '_parent'] if @parent_key
  result << [@routing_key, '_routing'] if @routing_key
  result
end

#create_time_parser ⇒ Object

once fluent v0.14 is released we might be able to use Fluent::Parser::TimeParser, but it doesn’t quite do what we want - if gives

sec,nsec

where as we want something we can call ‘strftime` on…



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 118

def create_time_parser
  if @time_key_format
    begin
      # Strptime doesn't support all formats, but for those it does it's
      # blazingly fast.
      strptime = Strptime.new(@time_key_format)
      Proc.new { |value| strptime.exec(value).to_datetime }
    rescue
      # Can happen if Strptime doesn't recognize the format; or
      # if strptime couldn't be required (because it's not installed -- it's
      # ruby 2 only)
      Proc.new { |value| DateTime.strptime(value, @time_key_format) }
    end
  else
    Proc.new { |value| DateTime.parse(value) }
  end
end

#flatten_record(record, prefix = []) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 264

def flatten_record(record, prefix=[])
  ret = {}
  if record.is_a? Hash
    record.each { |key, value|
      ret.merge! flatten_record(value, prefix + [key.to_s])
    }
  elsif record.is_a? Array
    # Don't mess with arrays, leave them unprocessed
    ret.merge!({prefix.join(@flatten_hashes_separator) => record})
  else
    return {prefix.join(@flatten_hashes_separator) => record}
  end
  ret
end

#get_connection_options ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 172

def get_connection_options
  raise "`password` must be present if `user` is present" if @user && !@password

  hosts = if @hosts
    @hosts.split(',').map do |host_str|
      # Support legacy hosts format host:port,host:port,host:port...
      if host_str.match(%r{^[^:]+(\:\d+)?$})
        {
          host:   host_str.split(':')[0],
          port:   (host_str.split(':')[1] || @port).to_i,
          scheme: @scheme
        }
      else
        # New hosts format expects URLs such as http://logs.foo.com,https://john:[email protected]/elastic
        uri = URI(host_str)
        %w(user password path).inject(host: uri.host, port: uri.port, scheme: uri.scheme) do |hash, key|
          hash[key.to_sym] = uri.public_send(key) unless uri.public_send(key).nil? || uri.public_send(key) == ''
          hash
        end
      end
    end.compact
  else
    [{host: @host, port: @port, scheme: @scheme}]
  end.each do |host|
    host.merge!(user: @user, password: @password) if !host[:user] && @user
    host.merge!(path: @path) if !host[:path] && @path
  end

  {
    hosts: hosts
  }
end

#get_parent_of(record, path) ⇒ Object

returns [parent, child_key] of child described by path array in record’s tree returns [nil, child_key] if path doesnt exist in record



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 347

def get_parent_of(record, path)
  parent_object = path[0..-2].reduce(record) { |a, e| a.is_a?(Hash) ? a[e] : nil }
  [parent_object, path[-1]]
end

#parse_time(value, event_time, tag) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 136

def parse_time(value, event_time, tag)
  @time_parser.call(value)
rescue => e
  router.emit_error_event(@time_parse_error_tag, Fluent::Engine.now, {'tag' => tag, 'time' => event_time, 'format' => @time_key_format, 'value' => value}, e)
  return Time.at(event_time).to_datetime
end

#remove_keys(record) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 255

def remove_keys(record)
  keys = record[@remove_keys_on_update_key] || @remove_keys_on_update || []
  record.delete(@remove_keys_on_update_key)
  return record unless keys.any?
  record = record.dup
  keys.each { |key| record.delete(key) }
  record
end

#send_bulk(data) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 352

def send_bulk(data)
  retries = 0
  begin
    response = client.bulk body: data
    if response['errors']
      log.error "Could not push log to Elasticsearch: #{response}"
    end
  rescue *client.transport.host_unreachable_exceptions => e
    if retries < 2
      retries += 1
      @_es = nil
      log.warn "Could not push logs to Elasticsearch, resetting connection and trying again. #{e.message}"
      sleep 2**retries
      retry
    end
    raise ConnectionFailure, "Could not push logs to Elasticsearch after #{retries} retries. #{e.message}"
  rescue Exception
    @_es = nil if @reconnect_on_error
    raise
  end
end

#update_body(record, op) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 242

def update_body(record, op)
  update = remove_keys(record)
  body = {"doc".freeze => update}
  if op == UPSERT_OP
    if update == record
      body["doc_as_upsert".freeze] = true
    else
      body[UPSERT_OP] = record
    end
  end
  body
end

#write_objects(tag, chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch.rb', line 279

def write_objects(tag, chunk)
  bulk_message = ''
  header = {}
  meta = {}

  chunk.msgpack_each do |time, record|
    next unless record.is_a? Hash

    if @flatten_hashes
      record = flatten_record(record)
    end

    target_index_parent, target_index_child_key = @target_index_key ? get_parent_of(record, @target_index_key) : nil
    if target_index_parent && target_index_parent[target_index_child_key]
      target_index = target_index_parent.delete(target_index_child_key)
    elsif @logstash_format
      if record.has_key?(TIMESTAMP_FIELD)
        rts = record[TIMESTAMP_FIELD]
        dt = parse_time(rts, time, tag)
      elsif record.has_key?(@time_key)
        rts = record[@time_key]
        dt = parse_time(rts, time, tag)
        record[TIMESTAMP_FIELD] = rts unless @time_key_exclude_timestamp
      else
        dt = Time.at(time).to_datetime
        record[TIMESTAMP_FIELD] = dt.iso8601(@time_precision)
      end
      dt = dt.new_offset(0) if @utc_index
      target_index = "#{@logstash_prefix}-#{dt.strftime(@logstash_dateformat)}"
    else
      target_index = @index_name
    end

    # Change target_index to lower-case since Elasticsearch doesn't
    # allow upper-case characters in index names.
    target_index = target_index.downcase
    if @include_tag_key
      record[@tag_key] = tag
    end

    target_type_parent, target_type_child_key = @target_type_key ? get_parent_of(record, @target_type_key) : nil
    if target_type_parent && target_type_parent[target_type_child_key]
      target_type = target_type_parent.delete(target_type_child_key)
    else
      target_type = @type_name
    end

    meta.clear
    meta["_index".freeze] = target_index
    meta["_type".freeze] = target_type

    @meta_config_map.each do |record_key, meta_key|
      meta[meta_key] = record[record_key] if record[record_key]
    end

    if @remove_keys
      @remove_keys.each { |key| record.delete(key) }
    end

    append_record_to_messages(@write_operation, meta, header, record, bulk_message)
  end

  send_bulk(bulk_message) unless bulk_message.empty?
  bulk_message.clear
end