Class: Fluent::ElasticsearchOutputDynamic

Inherits:
ElasticsearchOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_elasticsearch_dynamic.rb

Constant Summary collapse

DYNAMIC_PARAM_NAMES = 
%W[hosts host port logstash_format logstash_prefix logstash_dateformat time_key utc_index index_name tag_key type_name id_key parent_key routing_key write_operation]
DYNAMIC_PARAM_SYMBOLS = 
DYNAMIC_PARAM_NAMES.map { |n| "@#{n}".to_sym }

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#dynamic_config ⇒ Object (readonly)

Returns the value of attribute dynamic_config.



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 13

def dynamic_config
  @dynamic_config
end

Instance Method Details

#client(host) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 33

def client(host)

  # check here to see if we already have a client connection for the given host
  connection_options = get_connection_options(host)

  @_es = nil unless is_existing_connection(connection_options[:hosts])

  @_es ||= begin
    @current_config = connection_options[:hosts].clone
    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(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(host)})!" unless es.ping
    rescue *es.transport.host_unreachable_exceptions => e
      raise ConnectionFailure, "Can not reach Elasticsearch cluster (#{connection_options_description(host)})! #{e.message}"
    end

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

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 15

def configure(conf)
  super

  # evaluate all configurations here
  @dynamic_config = {}
  DYNAMIC_PARAM_SYMBOLS.each_with_index { |var, i|
    value = expand_param(self.instance_variable_get(var), nil, nil, nil)
    key = DYNAMIC_PARAM_NAMES[i]
    @dynamic_config[key] = value.to_s
  }
  # end eval all configs
  @current_config = nil
end

#connection_options_description(host) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 102

def connection_options_description(host)
  get_connection_options(host)[: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_dynamic.rb', line 29

def create_meta_config_map
  {'id_key' => '_id', 'parent_key' => '_parent', 'routing_key' => '_routing'}
end

#eval_or_val(var) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 213

def eval_or_val(var)
  return var unless var.is_a?(String)
  eval(var)
end

#expand_param(param, tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 218

def expand_param(param, tag, time, record)
  # check for '${ ... }'
  #   yes => `eval`
  #   no  => return param
  return param if (param =~ /\${.+}/).nil?

  # check for 'tag_parts[]'
    # separated by a delimiter (default '.')
  tag_parts = tag.split(@delimiter) unless (param =~ /tag_parts\[.+\]/).nil? || tag.nil?

  # pull out section between ${} then eval
  inner = param.clone
  while inner.match(/\${.+}/)
    to_eval = inner.match(/\${(.+?)}/){$1}

    if !(to_eval =~ /record\[.+\]/).nil? && record.nil?
      return to_eval
    elsif !(to_eval =~/tag_parts\[.+\]/).nil? && tag_parts.nil?
      return to_eval
    elsif !(to_eval =~/time/).nil? && time.nil?
      return to_eval
    else
      inner.sub!(/\${.+?}/, eval( to_eval ))
    end
  end
  inner
end

#get_connection_options(con_host) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 69

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

  hosts = if con_host || @hosts
    (con_host || @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.to_i, 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

#is_existing_connection(host) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 251

def is_existing_connection(host)
  # check if the host provided match the current connection
  return false if @_es.nil?
  return false if host.length != @current_config.length

  for i in 0...host.length
    if !host[i][:host].eql? @current_config[i][:host] || host[i][:port] != @current_config[i][:port]
      return false
    end
  end

  return true
end

#is_valid_expand_param_type(param) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 246

def is_valid_expand_param_type(param)
  return false if [:@buffer_type].include?(param)
  return self.instance_variable_get(param).is_a?(String)
end

#send_bulk(data, host) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 191

def send_bulk(data, host)
  retries = 0
  begin
    response = client(host).bulk body: data
    if response['errors']
      log.error "Could not push log to Elasticsearch: #{response}"
    end
  rescue *client(host).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

#write_objects(tag, chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_elasticsearch_dynamic.rb', line 110

def write_objects(tag, chunk)
  bulk_message = Hash.new { |h,k| h[k] = '' }
  dynamic_conf = @dynamic_config.clone

  headers = {
    UPDATE_OP => {},
    UPSERT_OP => {},
    CREATE_OP => {},
    INDEX_OP => {}
  }

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

    # evaluate all configurations here
    DYNAMIC_PARAM_SYMBOLS.each_with_index { |var, i|
      k = DYNAMIC_PARAM_NAMES[i]
      v = self.instance_variable_get(var)
      # check here to determine if we should evaluate
      if dynamic_conf[k] != v
        value = expand_param(v, tag, time, record)
        dynamic_conf[k] = value
      end
    }
    # end eval all configs

    if eval_or_val(dynamic_conf['logstash_format'])
      if record.has_key?("@timestamp")
        time = Time.parse record["@timestamp"]
      elsif record.has_key?(dynamic_conf['time_key'])
        time = Time.parse record[dynamic_conf['time_key']]
        record['@timestamp'] = record[dynamic_conf['time_key']] unless time_key_exclude_timestamp
      else
        record.merge!({"@timestamp" => Time.at(time).to_datetime.to_s})
      end

      if eval_or_val(dynamic_conf['utc_index'])
        target_index = "#{dynamic_conf['logstash_prefix']}-#{Time.at(time).getutc.strftime("#{dynamic_conf['logstash_dateformat']}")}"
      else
        target_index = "#{dynamic_conf['logstash_prefix']}-#{Time.at(time).strftime("#{dynamic_conf['logstash_dateformat']}")}"
      end
    else
      target_index = dynamic_conf['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.merge!(dynamic_conf['tag_key'] => tag)
    end

    meta = {"_index" => target_index, "_type" => dynamic_conf['type_name']}

    @meta_config_map.each_pair do |config_name, meta_key|
      if dynamic_conf[config_name] && record[dynamic_conf[config_name]]
        meta[meta_key] = record[dynamic_conf[config_name]]
      end
    end

    if dynamic_conf['hosts']
      host = dynamic_conf['hosts']
    else
      host = "#{dynamic_conf['host']}:#{dynamic_conf['port']}"
    end

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

    write_op = dynamic_conf["write_operation"]
    append_record_to_messages(write_op, meta, headers[write_op], record, bulk_message[host])
  end

  bulk_message.each do |hKey, msgs|
    send_bulk(msgs, hKey) unless msgs.empty?
    msgs.clear
  end
end