Class: Elasticsearch::Transport::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/elasticsearch/transport/client.rb

Overview

Handles communication with an Elasticsearch cluster.

See README for usage and code examples.

Constant Summary collapse

DEFAULT_TRANSPORT_CLASS = 
Transport::HTTP::Faraday
DEFAULT_LOGGER = 
lambda do
  require 'logger'
  logger = Logger.new(STDERR)
  logger.progname = 'elasticsearch'
  logger.formatter = proc { |severity, datetime, progname, msg| "#{datetime}: #{msg}\n" }
  logger
end
DEFAULT_TRACER = 
lambda do
  require 'logger'
  logger = Logger.new(STDERR)
  logger.progname = 'elasticsearch.tracer'
  logger.formatter = proc { |severity, datetime, progname, msg| "#{msg}\n" }
  logger
end
DEFAULT_HOST =

The default host and port to use if not otherwise specified.

Since:

  • 7.0.0

'localhost:9200'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arguments = {}) {|faraday| ... } ⇒ Client

Create a client connected to an Elasticsearch cluster.

Specify the URL via arguments or set the ‘ELASTICSEARCH_URL` environment variable.

Parameters:

  • arguments (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (arguments):

  • :hosts (String, Array) —

    Single host passed as a String or Hash, or multiple hosts passed as an Array; ‘host` or `url` keys are also valid

  • :log (Boolean) —

    Use the default logger (disabled by default)

  • :trace (Boolean) —

    Use the default tracer (disabled by default)

  • :logger (Object) —

    An instance of a Logger-compatible object

  • :tracer (Object) —

    An instance of a Logger-compatible object

  • :resurrect_after (Number) —

    After how many seconds a dead connection should be tried again

  • :reload_connections (Boolean, Number) —

    Reload connections after X requests (false by default)

  • :randomize_hosts (Boolean) —

    Shuffle connections on initialization and reload (false by default)

  • :sniffer_timeout (Integer) —

    Timeout for reloading connections in seconds (1 by default)

  • :retry_on_failure (Boolean, Number) —

    Retry X times when request fails before raising and exception (false by default)

  • Array (Number) —

    :retry_on_status Retry when specific status codes are returned

  • :reload_on_failure (Boolean) —

    Reload connections after failure (false by default)

  • :request_timeout (Integer) —

    The request timeout to be passed to transport in options

  • :adapter (Symbol) —

    A specific adapter for Faraday (e.g. ‘:patron`)

  • :transport_options (Hash) —

    Options to be passed to the ‘Faraday::Connection` constructor

  • :transport_class (Constant) —

    A specific transport class to use, will be initialized by the client and passed hosts and all arguments

  • :transport (Object) —

    A specific transport instance

  • :serializer_class (Constant) —

    A specific serializer class to use, will be initialized by the transport and passed the transport instance

  • :selector (Constant) —

    An instance of selector strategy implemented with Transport::Connections::Selector::Base.

  • :send_get_body_as (String) —

    Specify the HTTP method to use for GET requests with a body. (Default: GET)

Yields:

  • (faraday) —

    Access and configure the ‘Faraday::Connection` instance directly with a block



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# File 'lib/elasticsearch/transport/client.rb', line 107

def initialize(arguments={}, &block)
  @options = arguments.each_with_object({}){ |(k,v), args| args[k.to_sym] = v }
  @arguments = @options
  @arguments[:logger] ||= @arguments[:log]   ? DEFAULT_LOGGER.call() : nil
  @arguments[:tracer] ||= @arguments[:trace] ? DEFAULT_TRACER.call() : nil
  @arguments[:reload_connections] ||= false
  @arguments[:retry_on_failure]   ||= false
  @arguments[:reload_on_failure]  ||= false
  @arguments[:randomize_hosts]    ||= false
  @arguments[:transport_options]  ||= {}
  @arguments[:http]               ||= {}
  @options[:http]               ||= {}

  @seeds = __extract_hosts(@arguments[:hosts] ||
                               @arguments[:host] ||
                               @arguments[:url] ||
                               @arguments[:urls] ||
                               ENV['ELASTICSEARCH_URL'] ||
                               DEFAULT_HOST)

  @send_get_body_as = @arguments[:send_get_body_as] || 'GET'

  if @arguments[:request_timeout]
    @arguments[:transport_options][:request] = { :timeout => @arguments[:request_timeout] }
  end

  @arguments[:transport_options][:headers] ||= {}

  unless @arguments[:transport_options][:headers].keys.any? {|k| k.to_s.downcase =~ /content\-?\_?type/}
    @arguments[:transport_options][:headers]['Content-Type'] = 'application/json'
  end

  if @arguments[:transport]
    @transport = @arguments[:transport]
  else
    transport_class  = @arguments[:transport_class] || DEFAULT_TRANSPORT_CLASS
    if transport_class == Transport::HTTP::Faraday
      @transport = transport_class.new(:hosts => @seeds, :options => @arguments) do |faraday|
        block.call faraday if block
        unless (h = faraday.builder.handlers.last) && h.name.start_with?("Faraday::Adapter")
          faraday.adapter(@arguments[:adapter] || __auto_detect_adapter)
        end
      end
    else
      @transport = transport_class.new(:hosts => @seeds, :options => @arguments)
    end
  end
end

Instance Attribute Details

#transport ⇒ Object

Returns the transport object.

See Also:



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# File 'lib/elasticsearch/transport/client.rb', line 54

def transport
  @transport
end

Instance Method Details

#perform_request(method, path, params = {}, body = nil, headers = nil) ⇒ Object

Performs a request through delegation to #transport.



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# File 'lib/elasticsearch/transport/client.rb', line 158

def perform_request(method, path, params={}, body=nil, headers=nil)
  method = @send_get_body_as if 'GET' == method && body
  transport.perform_request(method, path, params, body, headers)
end