Class: Fluent::Plugin::PrometheusInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_prometheus.rb,
lib/fluent/plugin/in_prometheus/async_wrapper.rb

Defined Under Namespace

Modules: AsyncWrapper

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PrometheusInput

Returns a new instance of PrometheusInput.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 39

def initialize
  super
  @registry = ::Prometheus::Client.registry
  @secure = nil
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_prometheus.rb', line 45

def configure(conf)
  super

  # Get how many workers we have
  sysconf = if self.respond_to?(:owner) && owner.respond_to?(:system_config)
              owner.system_config
            elsif self.respond_to?(:system_config)
              self.system_config
            else
              nil
            end
  @num_workers = sysconf && sysconf.workers ? sysconf.workers : 1
  @secure = @transport_config.protocol == :tls || (@ssl && @ssl['enable'])

  @base_port = @port
  @port += fluentd_worker_id
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/in_prometheus.rb', line 63

def multi_workers_ready?
  true
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_prometheus.rb', line 134

def shutdown
  if @webrick_server
    @webrick_server.shutdown
    @webrick_server = nil
  end
  super
end

#start ⇒ Object 



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

def start
  super

  # Normalize bind address: strip brackets if present (for consistency)
  # Brackets are only for URI formatting, not for socket binding
  @bind = @bind[1..-2] if @bind.start_with?('[') && @bind.end_with?(']')

  scheme = @secure ? 'https' : 'http'
  # Format bind address properly for URLs (add brackets for IPv6)
  bind_display = @bind.include?(':') ? "[#{@bind}]" : @bind
  log.debug "listening prometheus http server on #{scheme}://#{bind_display}:#{@port}/#{@metrics_path} for worker#{fluentd_worker_id}"

  proto = @secure ? :tls : :tcp

  # IPv6 + TLS combination is not currently supported
  if @bind.include?(':') && @secure
    raise Fluent::ConfigError, 'IPv6 with <transport tls> is not currently supported. Use bind 0.0.0.0 with TLS, or bind ::1 without TLS.'
  end

  # Use webrick for IPv6 or SSL extra_conf
  # The http_server helper has issues with IPv6 URI construction
  if (@ssl && @ssl['enable'] && @ssl['extra_conf']) || @bind.include?(':')
    start_webrick
    return
  end

  begin
    require 'async'
    require 'fluent/plugin/in_prometheus/async_wrapper'
    extend AsyncWrapper
  rescue LoadError => _
    # ignore
  end

  tls_opt = if @ssl && @ssl['enable']
              ssl_config = {}

              if (@ssl['certificate_path'] && @ssl['private_key_path'].nil?) || (@ssl['certificate_path'].nil? && @ssl['private_key_path'])
                raise Fluent::ConfigError.new('both certificate_path and private_key_path must be defined')
              end

              if @ssl['certificate_path']
                ssl_config['cert_path'] = @ssl['certificate_path']
              end

              if @ssl['private_key_path']
                ssl_config['private_key_path'] = @ssl['private_key_path']
              end

              if @ssl['ca_path']
                ssl_config['ca_path'] = @ssl['ca_path']
                # Only ca_path is insecure in fluentd
                # https://github.com/fluent/fluentd/blob/2236ad45197ba336fd9faf56f442252c8b226f25/lib/fluent/plugin_helper/cert_option.rb#L68
                ssl_config['insecure'] = true
              end

              ssl_config
            end

  # Use raw bind address for socket binding (no brackets)
  # Brackets are only for URL/URI formatting, not for bind()
  http_server_create_http_server(:in_prometheus_server, addr: @bind, port: @port, logger: log, proto: proto, tls_opts: tls_opt) do |server|
    server.get(@metrics_path) { |_req| all_metrics }
    server.get(@aggregated_metrics_path) { |_req| all_workers_metrics }
  end
end