Class: LogStash::Outputs::ElasticSearch::HttpClient

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/outputs/elasticsearch/http_client.rb,
lib/logstash/outputs/elasticsearch/http_client/pool.rb,
lib/logstash/outputs/elasticsearch/http_client/manticore_adapter.rb

Defined Under Namespace

Classes: ManticoreAdapter, Pool

Constant Summary collapse

DEFAULT_HEADERS = 
{ "Content-Type" => "application/json", 'x-elastic-product-origin' => 'logstash-output-elasticsearch' }

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ HttpClient

The ‘options` is a hash where the following symbol keys have meaning:

  • ‘:hosts` - array of String. Set a list of hosts to use for communication.

  • ‘:port` - number. set the port to use to communicate with Elasticsearch

  • ‘:user` - String. The user to use for authentication.

  • ‘:password` - String. The password to use for authentication.

  • ‘:timeout` - Float. A duration value, in seconds, after which a socket

    operation or request will be aborted if not yet successful

  • ‘:client_settings` - a hash; see below for keys.

The ‘client_settings` key is a has that can contain other settings:

  • ‘:ssl` - Boolean. Enable or disable SSL/TLS.

  • ‘:proxy` - String. Choose a HTTP HTTProxy to use.

  • ‘:path` - String. The leading path for prefixing Elasticsearch

  • ‘:headers` - Hash. Pairs of headers and their values requests. This is sometimes used if you are proxying Elasticsearch access through a special http path, such as using mod_rewrite.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 53

def initialize(options={})
  @logger = options[:logger]
  @metric = options[:metric]
  @bulk_request_metrics = @metric.namespace(:bulk_requests)
  @bulk_response_metrics = @bulk_request_metrics.namespace(:responses)

  # Again, in case we use DEFAULT_OPTIONS in the future, uncomment this.
  # @options = DEFAULT_OPTIONS.merge(options)
  @options = options

  @url_template = build_url_template

  @pool = build_pool(@options)
  # mutex to prevent requests and sniffing to access the
  # connection pool at the same time
  @bulk_path = @options[:bulk_path]
end

Instance Attribute Details

#action_count ⇒ Object (readonly)

Returns the value of attribute action_count.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def action_count
  @action_count
end

#client ⇒ Object (readonly)

Returns the value of attribute client.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def client
  @client
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def logger
  @logger
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def options
  @options
end

#pool ⇒ Object (readonly)

Returns the value of attribute pool.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def pool
  @pool
end

#recv_count ⇒ Object (readonly)

Returns the value of attribute recv_count.



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 28

def recv_count
  @recv_count
end

Instance Method Details

#alive_urls_count ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 102

def alive_urls_count
  @pool.alive_urls_count
end

#build_adapter(options) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 322

def build_adapter(options)
  timeout = options[:timeout] || 0
  
  adapter_options = {
    :socket_timeout => timeout,
    :request_timeout => timeout,
  }

  adapter_options[:user_agent] = prepare_user_agent

  adapter_options[:proxy] = client_settings[:proxy] if client_settings[:proxy]

  adapter_options[:check_connection_timeout] = client_settings[:check_connection_timeout] if client_settings[:check_connection_timeout]

  # Having this explicitly set to nil is an error
  if client_settings[:pool_max]
    adapter_options[:pool_max] = client_settings[:pool_max]
  end

  # Having this explicitly set to nil is an error
  if client_settings[:pool_max_per_route]
    adapter_options[:pool_max_per_route] = client_settings[:pool_max_per_route]
  end

  adapter_options[:ssl] = ssl_options if self.scheme == 'https'

  adapter_options[:headers] = client_settings[:headers] if client_settings[:headers]

  ::LogStash::Outputs::ElasticSearch::HttpClient::ManticoreAdapter.new(@logger, adapter_options)
end

#build_pool(options) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 365

def build_pool(options)
  adapter = build_adapter(options)

  pool_options = {
    :license_checker => options[:license_checker],
    :sniffing => sniffing,
    :sniffer_delay => options[:sniffer_delay],
    :sniffing_path => options[:sniffing_path],
    :healthcheck_path => options[:healthcheck_path],
    :resurrect_delay => options[:resurrect_delay],
    :url_normalizer => self.method(:host_to_url),
    :metric => options[:metric]
  }
  pool_options[:scheme] = self.scheme if self.scheme

  pool_class = ::LogStash::Outputs::ElasticSearch::HttpClient::Pool
  full_urls = @options[:hosts].map {|h| host_to_url(h) }
  pool = pool_class.new(@logger, adapter, full_urls, pool_options)
  pool.start
  pool
end

#build_url_template ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 71

def build_url_template
  {
    :scheme => self.scheme,
    :user => self.user,
    :password => self.password,
    :host => "URLTEMPLATE",
    :port => self.port,
    :path => self.path
  }
end

#bulk(actions) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 106

def bulk(actions)
  @action_count ||= 0
  @action_count += actions.size

  return if actions.empty?

  bulk_actions = actions.collect do |action, args, source|
    args, source = update_action_builder(args, source) if action == 'update'

    if source && action != 'delete'
      next [ { action => args }, source ]
    else
      next { action => args }
    end
  end

  body_stream = StringIO.new
  if compression_level?
    body_stream.set_encoding "BINARY"
    stream_writer = gzip_writer(body_stream)
  else
    stream_writer = body_stream
  end

  bulk_responses = []
  batch_actions = []
  bulk_actions.each_with_index do |action, index|
    as_json = action.is_a?(Array) ?
                action.map {|line| LogStash::Json.dump(line)}.join("\n") :
                LogStash::Json.dump(action)
    as_json << "\n"

    as_json.scrub! # ensure generated JSON is valid UTF-8

    if (stream_writer.pos + as_json.bytesize) > TARGET_BULK_BYTES && stream_writer.pos > 0
      stream_writer.flush # ensure writer has sync'd buffers before reporting sizes
      logger.debug("Sending partial bulk request for batch with one or more actions remaining.",
                   :action_count => batch_actions.size,
                   :payload_size => stream_writer.pos,
                   :content_length => body_stream.size,
                   :batch_offset => (index + 1 - batch_actions.size))
      headers = {
        EVENT_COUNT_HEADER => batch_actions.size.to_s,
        UNCOMPRESSED_LENGTH_HEADER => stream_writer.pos.to_s
      }
      bulk_responses << bulk_send(body_stream, batch_actions, headers)
      body_stream.truncate(0) && body_stream.seek(0)
      stream_writer = gzip_writer(body_stream) if compression_level?
      batch_actions.clear
    end
    stream_writer.write(as_json)
    batch_actions << action
  end

  stream_writer.close if compression_level?

  logger.debug("Sending final bulk request for batch.",
               :action_count => batch_actions.size,
               :payload_size => stream_writer.pos,
               :content_length => body_stream.size,
               :batch_offset => (actions.size - batch_actions.size))

  if body_stream.size > 0
    headers = {
      EVENT_COUNT_HEADER => batch_actions.size.to_s,
      UNCOMPRESSED_LENGTH_HEADER => stream_writer.pos.to_s
    }
    bulk_responses << bulk_send(body_stream, batch_actions, headers)
  end

  body_stream.close unless compression_level?
  join_bulk_responses(bulk_responses)
end

#bulk_send(body_stream, batch_actions, headers = {}) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 194

def bulk_send(body_stream, batch_actions, headers = {})
  params = compression_level? ? {:headers => headers.merge("Content-Encoding" => "gzip") } : { :headers => headers }

  begin
    response = @pool.post(@bulk_path, params, body_stream.string)
    @bulk_response_metrics.increment(response.code.to_s)
  rescue ::LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError => e
    @bulk_response_metrics.increment(e.response_code.to_s)
    raise e unless e.response_code == 413
    # special handling for 413, treat it as a document level issue
    logger.warn("Bulk request rejected: `413 Payload Too Large`", :action_count => batch_actions.size, :content_length => body_stream.size)
    return emulate_batch_error_response(batch_actions, 413, 'payload_too_large')
  rescue => e # it may be a network issue instead, re-raise
    raise e
  end

  LogStash::Json.load(response.body)
end

#calculate_property(uris, property, default, sniff_check) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 240

def calculate_property(uris, property, default, sniff_check)
  values = uris.map(&property).uniq

  if sniff_check && values.size > 1
    raise LogStash::ConfigurationError, "Cannot have multiple values for #{property} in hosts when sniffing is enabled!"
  end

  uri_value = values.first

  default = nil if default.is_a?(String) && default.empty? # Blanks are as good as nil
  uri_value = nil if uri_value.is_a?(String) && uri_value.empty?

  if default && uri_value && (default != uri_value)
    raise LogStash::ConfigurationError, "Explicit value for '#{property}' was declared, but it is different in one of the URLs given! Please make sure your URLs are inline with explicit values. The URLs have the property set to '#{uri_value}', but it was also set to '#{default}' explicitly"
  end

  uri_value || default
end

#client_settings ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 308

def client_settings
  @_client_settings ||= @options[:client_settings] || {}
end

#close ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 236

def close
  @pool.close
end

#compression_level? ⇒ Boolean

return true if compression_level is [1..9] return false if it is 0



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 318

def compression_level?
  client_settings.fetch(:compression_level) > 0
end

#emulate_batch_error_response(actions, http_code, reason) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 213

def emulate_batch_error_response(actions, http_code, reason)
  {
      "errors" => true,
      "items" => actions.map do |action|
        action = action.first if action.is_a?(Array)
        request_action, request_parameters = action.first
        {
            request_action => {"status" => http_code, "error" => { "type" => reason }}
        }
      end
  }
end

#exists?(path, use_get = false) ⇒ Boolean 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 421

def exists?(path, use_get=false)
  response = use_get ? @pool.get(path) : @pool.head(path)
  response.code >= 200 && response.code <= 299
rescue ::LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError => e
  return false if e.response_code == 404
  raise e
end

#get(path) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 226

def get(path)
  response = @pool.get(path)
  LogStash::Json.load(response.body)
end

#get_ilm_endpoint ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 465

def get_ilm_endpoint
  @pool.get("/_ilm/policy")
end

#get_xpack_info ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 461

def get_xpack_info
  get("/_xpack")
end

#gzip_writer(io) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 180

def gzip_writer(io)
  fail(ArgumentError, "Cannot create gzip writer on IO with unread bytes") unless io.eof?
  fail(ArgumentError, "Cannot create gzip writer on non-empty IO") unless io.pos == 0

  Zlib::GzipWriter.new(io, client_settings.fetch(:compression_level), Zlib::DEFAULT_STRATEGY)
end

#host_to_url(h) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 387

def host_to_url(h)
  # Never override the calculated scheme
  raw_scheme = @url_template[:scheme] || 'http'

  raw_user = h.user || @url_template[:user]
  raw_password = h.password || @url_template[:password]
  postfixed_userinfo = raw_user && raw_password ? "#{raw_user}:#{raw_password}@" : nil

  raw_host = h.host # Always replace this!
  raw_port =  h.port || @url_template[:port]

  raw_path = !h.path.nil? && !h.path.empty? &&  h.path != "/" ? h.path : @url_template[:path]
  prefixed_raw_path = raw_path && !raw_path.empty? ? raw_path : "/"

  parameters = client_settings[:parameters]
  raw_query = if parameters && !parameters.empty?
                combined = h.query ?
                  Hash[URI::decode_www_form(h.query)].merge(parameters) :
                  parameters
                query_str = combined.flat_map {|k,v|
                  values = Array(v)
                  values.map {|av| "#{k}=#{av}"}
                }.join("&")
                query_str
              else
                h.query
              end
  prefixed_raw_query = raw_query && !raw_query.empty? ? "?#{raw_query}" : nil
  
  raw_url = "#{raw_scheme}://#{postfixed_userinfo}#{raw_host}:#{raw_port}#{prefixed_raw_path}#{prefixed_raw_query}"

  ::LogStash::Util::SafeURI.new(raw_url)
end

#ilm_policy_exists?(name) ⇒ Boolean 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 469

def ilm_policy_exists?(name)
  exists?("/_ilm/policy/#{name}", true)
end

#ilm_policy_put(name, policy) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 473

def ilm_policy_put(name, policy)
  path = "_ilm/policy/#{name}"
  logger.info("Installing ILM policy #{policy}", name: name)
  @pool.put(path, nil, LogStash::Json.dump(policy))
end

#join_bulk_responses(bulk_responses) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 187

def join_bulk_responses(bulk_responses)
  {
    "errors" => bulk_responses.any? {|r| r["errors"] == true},
    "items" => bulk_responses.reduce([]) {|m,r| m.concat(r.fetch("items", []))}
  }
end

#last_es_version ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 90

def last_es_version
  @pool.last_es_version
end

#maximum_seen_major_version ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 94

def maximum_seen_major_version
  @pool.maximum_seen_major_version
end

#password ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 267

def password
  calculate_property(uris, :password, @options[:password], sniffing)
end

#path ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 271

def path
  calculated = calculate_property(uris, :path, client_settings[:path], sniffing)
  calculated = "/#{calculated}" if calculated && !calculated.start_with?("/")
  calculated
end

#port ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 297

def port
  # We don't set the 'default' here because the default is what the user
  # indicated, so we use an || outside of calculate_property. This lets people
  # Enter things like foo:123, bar and wind up with foo:123, bar:9200
  calculate_property(uris, :port, nil, sniffing) || 9200
end

#post(path, params = {}, body_string) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 231

def post(path, params = {}, body_string)
  response = @pool.post(path, params, body_string)
  LogStash::Json.load(response.body)
end

#prepare_user_agent ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 353

def prepare_user_agent
  os_name = java.lang.System.getProperty('os.name')
  os_version = java.lang.System.getProperty('os.version')
  os_arch = java.lang.System.getProperty('os.arch')
  jvm_vendor = java.lang.System.getProperty('java.vendor')
  jvm_version = java.lang.System.getProperty('java.version')

  plugin_version = Gem.loaded_specs['logstash-output-elasticsearch'].version
  # example: Logstash/7.14.1 (OS=Linux-5.4.0-84-generic-amd64; JVM=AdoptOpenJDK-11.0.11) logstash-output-elasticsearch/11.0.1
  "Logstash/#{LOGSTASH_VERSION} (OS=#{os_name}-#{os_version}-#{os_arch}; JVM=#{jvm_vendor}-#{jvm_version}) logstash-output-elasticsearch/#{plugin_version}"
end

#rollover_alias_exists?(name) ⇒ Boolean

check whether rollover alias already exists



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 444

def rollover_alias_exists?(name)
  exists?(name)
end

#rollover_alias_put(alias_name, alias_definition) ⇒ Object

Create a new rollover alias



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 449

def rollover_alias_put(alias_name, alias_definition)
  @pool.put(CGI::escape(alias_name), nil, LogStash::Json.dump(alias_definition))
  logger.info("Created rollover alias", name: alias_name)
  # If the rollover alias already exists, ignore the error that comes back from Elasticsearch
rescue ::LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError => e
  if e.response_code == 400
    logger.info("Rollover alias already exists, skipping", name: alias_name)
    return
  end
  raise e
end

#scheme ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 277

def scheme
  explicit_scheme = if ssl_options && ssl_options.has_key?(:enabled)
                      ssl_options[:enabled] ? 'https' : 'http'
                    else
                      nil
                    end
  
  calculated_scheme = calculate_property(uris, :scheme, explicit_scheme, sniffing)

  if calculated_scheme && calculated_scheme !~ /https?/
    raise LogStash::ConfigurationError, "Bad scheme '#{calculated_scheme}' found should be one of http/https"
  end

  if calculated_scheme && explicit_scheme && calculated_scheme != explicit_scheme
    raise LogStash::ConfigurationError, "SSL option was explicitly set to #{ssl_options[:enabled]} but a URL was also declared with a scheme of '#{explicit_scheme}'. Please reconcile this"
  end

  calculated_scheme # May be nil if explicit_scheme is nil!
end

#serverless? ⇒ Boolean 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 98

def serverless?
  @pool.serverless?
end

#sniffing ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 259

def sniffing
  @options[:sniffing]
end

#ssl_options ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 312

def ssl_options
  @_ssl_options ||= client_settings.fetch(:ssl, {})
end

#template_exists?(template_endpoint, name) ⇒ Boolean 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 429

def template_exists?(template_endpoint, name)
  exists?("/#{template_endpoint}/#{name}")
end

#template_install(template_endpoint, name, template, force = false) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 82

def template_install(template_endpoint, name, template, force=false)
  if template_exists?(template_endpoint, name) && !force
    @logger.debug("Found existing Elasticsearch template, skipping template management", name: name)
    return
  end
  template_put(template_endpoint, name, template)
end

#template_put(template_endpoint, name, template) ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 433

def template_put(template_endpoint, name, template)
  path = "#{template_endpoint}/#{name}"
  logger.info("Installing Elasticsearch template", name: name)
  @pool.put(path, nil, LogStash::Json.dump(template))
rescue ::LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError => e
  raise e unless e.response_code == 404
end

#update_action_builder(args, source) ⇒ Object

Build a bulk item for an elasticsearch update action



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 481

def update_action_builder(args, source)
  args = args.clone()
  if args[:_script]
    # Use the event as a hash from your script with variable name defined
    # by script_var_name (default: "event")
    # Ex: event["@timestamp"]
    source_orig = source
    source = { 'script' => {'params' => { @options[:script_var_name] => source_orig }} }
    if @options[:scripted_upsert]
      source['scripted_upsert'] = true
      source['upsert'] = {}
    elsif @options[:doc_as_upsert]
      source['upsert'] = source_orig
    else
      source['upsert'] = args.delete(:_upsert) if args[:_upsert]
    end
    case @options[:script_type]
    when 'indexed'
      source['script']['id'] = args.delete(:_script)
    when 'file'
      source['script']['file'] = args.delete(:_script)
    when 'inline'
      source['script']['inline'] = args.delete(:_script)
    end
    source['script']['lang'] = @options[:script_lang] if @options[:script_lang] != ''
  else
    source = { 'doc' => source }
    if @options[:doc_as_upsert]
      source['doc_as_upsert'] = true
    else
      source['upsert'] = args.delete(:_upsert) if args[:_upsert]
    end
  end
  [args, source]
end

#uris ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 304

def uris
  @options[:hosts]
end

#user ⇒ Object 



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# File 'lib/logstash/outputs/elasticsearch/http_client.rb', line 263

def user
  calculate_property(uris, :user, @options[:user], sniffing)
end