Class: Fluent::Plugin::Uuid2podnameFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/fluent/plugin/filter_uuid2podname.rb

Constant Summary collapse

K8_POD_CA_CERT = 
'ca.crt'
K8_POD_TOKEN = 
'token'

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/filter_uuid2podname.rb', line 26

def configure(conf)
  super

  def log.trace?
    level == Fluent::Log::LEVEL_TRACE
  end
  require 'kubeclient'

  log.debug "Uuid2podname Filter configure"

  # Use Kubernetes default service account if we're in a pod.
  if @kubernetes_url.nil?
    log.debug "Kubernetes URL is not set - inspecting environment"

    env_host = ENV['KUBERNETES_SERVICE_HOST']
    env_port = ENV['KUBERNETES_SERVICE_PORT']
    if !env_host.nil? && !env_port.nil?
      if insecure
        @kubernetes_url = "http://#{env_host}:#{env_port}/api"
      else
        @kubernetes_url = "https://#{env_host}:#{env_port}/api"
      end
      log.debug "Kubernetes URL is now '#{@kubernetes_url}'"
    end
  end

  # Use SSL certificate and bearer token from Kubernetes service account.
  if Dir.exist?(@secret_dir)
    log.debug "Found directory with secrets: #{@secret_dir}"
    ca_cert = File.join(@secret_dir, K8_POD_CA_CERT)
    pod_token = File.join(@secret_dir, K8_POD_TOKEN)

    if @ca_file.nil? and File.exist?(ca_cert)
      log.debug "Found CA certificate: #{ca_cert}"
      @ca_file = ca_cert
    end

    if @bearer_token_file.nil? and File.exist?(pod_token)
      log.debug "Found pod token: #{pod_token}"
      @bearer_token_file = pod_token
    end
  end

  if !@kubernetes_url.nil?
    if insecure
      log.debug "Creating insecure K8S client"
      @client = Kubeclient::Client.new @kubernetes_url, @apiVersion
    else 
      ssl_options = {
          client_cert: !@client_cert.nil? ? OpenSSL::X509::Certificate.new(File.read(@client_cert)) : nil,
          client_key:  !@client_key.nil? ? OpenSSL::PKey::RSA.new(File.read(@client_key)) : nil,
          ca_file:     @ca_file,
          verify_ssl:  @verify_ssl ? OpenSSL::SSL::VERIFY_PEER : OpenSSL::SSL::VERIFY_NONE
      }

      auth_options = {}

      if !@bearer_token_file.nil?
        bearer_token = File.read(@bearer_token_file)
        auth_options[:bearer_token] = bearer_token
      end

      log.debug "Creating secure K8S client"
      @client = Kubeclient::Client.new @kubernetes_url, @apiVersion,
                                      ssl_options: ssl_options,
                                      auth_options: auth_options
    end

    begin
      @client.api_valid?
    rescue KubeException => kube_error
      raise Fluent::ConfigError, "Invalid Kubernetes API #{@apiVersion} endpoint #{@kubernetes_url}: #{kube_error.message}"
    end
    @podsHash = {}
    fetch_pods
  end
end

#fetch_pods ⇒ Object 



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# File 'lib/fluent/plugin/filter_uuid2podname.rb', line 128

def fetch_pods()
  log.debug "Uuid2podname Filter fetch_pods"
  newPodsHash = {}
  @client.get_pods.each do |pod_object|
    kubernetes_metadata = parse_pod_metadata(pod_object)
    newPodsHash[kubernetes_metadata['kubernetes']['pod_id']] = kubernetes_metadata
  end
  @podsHash = newPodsHash.merge @podsHash
end

#filter_stream(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/filter_uuid2podname.rb', line 104

def filter_stream(tag, es)
  log.debug "Uuid2podname Filter filter"
  return es if (es.respond_to?(:empty?) && es.empty?) || !es.is_a?(Fluent::EventStream)
  new_es = Fluent::MultiEventStream.new
  es.each do |time, record|
    metadata = nil
    if @podsHash.has_key?(record['uuid'])
      metadata = @podsHash[record['uuid']]
      log.debug "find pod for uuid: #{record['uuid']}"
    else
      fetch_pods
      if @podsHash.has_key?(record['uuid'])
        metadata = @podsHash[record['uuid']]
      else
        log.error "pod does not exist: #{record['uuid']}"
      end 
    end
    record = record.merge(metadata) if metadata
    new_es.add(time, record)
  end

  new_es
end

#parse_pod_metadata(pod_object) ⇒ Object 



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# File 'lib/fluent/plugin/filter_uuid2podname.rb', line 138

def parse_pod_metadata(pod_object)
  labels = syms_to_strs(pod_object['metadata']['labels'].to_h)
  if @de_dot
    self.de_dot!(labels)
    self.de_dot!(annotations)
  end
  
  # collect container informations
  container_meta = {}
  begin
    pod_object['status']['containerStatuses'].each do|container_status|
      # get plain container id (eg. docker://hash -> hash)
      container_id = container_status['containerID'].sub /^[-_a-zA-Z0-9]+:\/\//, ''
      container_meta[container_id] = {
          'name' => container_status['name'],
          'image' => container_status['image'],
          'image_id' => container_status['imageID']
      }
    end
  rescue
    log.debug("parsing container meta information failed for: #{pod_object['metadata']['namespace']}/#{pod_object['metadata']['name']} ")
  end
  
  kubernetes_metadata = {
      'namespace_name' => pod_object['metadata']['namespace'],
      'pod_id'         => pod_object['metadata']['uid'],
      'pod_name'       => pod_object['metadata']['name'],
      'containers'     => syms_to_strs(container_meta),
      'labels'         => labels,
      'host'           => pod_object['spec']['nodeName'],
      'master_url'     => @kubernetes_url
  }
  metadata = {
    'kubernetes' => kubernetes_metadata
  }
  return metadata
end

#syms_to_strs(hsh) ⇒ Object 



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# File 'lib/fluent/plugin/filter_uuid2podname.rb', line 176

def syms_to_strs(hsh)
  newhsh = {}
  hsh.each_pair do |kk,vv|
    if vv.is_a?(Hash)
      vv = syms_to_strs(vv)
    end
    if kk.is_a?(Symbol)
      newhsh[kk.to_s] = vv
    else
      newhsh[kk] = vv
    end
  end
  newhsh
end