Module: Util::KubeClient

Extended by:
Logging
Defined in:
lib/util/kube_client.rb

Constant Summary

Constants included from Logging

Logging::SEV_LABEL, Logging::TRACE

Class Method Summary collapse

Methods included from Logging

logger, logger=

Class Method Details

.create_client_by_object_type(api_endpoint, api_version) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 57

def create_client_by_object_type(api_endpoint, api_version)
  if !@current_kube_context.nil?
    create_kube_client_config(api_endpoint, api_version)
  else
    create_kube_client_default(api_endpoint, api_version)
  end
end

.create_clients(kube_config_hash) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 18

def create_clients(kube_config_hash)
  begin
    initialize_config(kube_config_hash)
    @core_client = create_client_by_object_type('', @api_version)
    @apps_client = create_client_by_object_type('/apis/apps', @api_version)
    @batch_client = create_client_by_object_type('/apis/batch', @api_version)
    @discover_v1_client = create_client_by_object_type('/apis/discovery.k8s.io', @api_version)
  rescue StandardError => e
    logger.error("Error while creating kube clients. Error - #{e}")
    raise e
  end

  set_clients(@core_client, @apps_client, @batch_client, @discover_v1_client)
end

.create_kube_client_config(api_endpoint, api_version) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 65

def create_kube_client_config(api_endpoint, api_version)
  logger.debug("Endpoint: #{@current_kube_context.api_endpoint + api_endpoint} and api_version: #{api_version}")
  begin
    # TODO: Test with SSL options.
    client = Kubeclient::Client.new(
      @current_kube_context.api_endpoint + api_endpoint,
      api_version,
      ssl_options: @current_kube_context.ssl_options,
      auth_options: @current_kube_context.auth_options
    )
  rescue StandardError => e
    logger.error("Error while creating kube client based on config - #{e}")
    raise e
  end
  client
end

.create_kube_client_default(api_endpoint, api_version) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 82

def create_kube_client_default(api_endpoint, api_version)
  # Reference: https://github.com/splunk/fluent-plugin-kubernetes-objects/blob/develop/lib/fluent/plugin/in_kubernetes_objects.rb#L139
  kubernetes_url = nil
  if @kubernetes_url.nil?
    # Use Kubernetes default service account if we're in a pod.
    env_host = ENV['KUBERNETES_SERVICE_HOST']
    env_host = "[#{env_host}]" if env_host =~ Resolv::IPv6::Regex
    env_port = ENV['KUBERNETES_SERVICE_PORT']
    if env_host && env_port
      # kubernetes_url = "https://#{env_host}:#{env_port}/#{@api_endpoint.delete_prefix('/')}#{api_endpoint}"
      kubernetes_url = "https://#{env_host}:#{env_port}#{api_endpoint}"
    end
  else
    kubernetes_url = @kubernetes_url + api_endpoint
  end

  # Use SSL certificate and bearer token from Kubernetes service account.
  if Dir.exist?(@secret_dir)
    secret_ca_file = File.join(@secret_dir, 'ca.crt')
    secret_token_file = File.join(@secret_dir, 'token')

    @ca_file = secret_ca_file if @ca_file.nil? && File.exist?(secret_ca_file)

    @bearer_token_file = secret_token_file if @bearer_token_file.nil? && File.exist?(secret_token_file)
  end

  ssl_options = {
    client_cert: @client_cert && OpenSSL::X509::Certificate.new(File.read(@client_cert)),
    client_key: @client_key && OpenSSL::PKey::RSA.new(File.read(@client_key)),
    ca_file: @ca_file,
    verify_ssl: @verify_ssl ? OpenSSL::SSL::VERIFY_NONE : OpenSSL::SSL::VERIFY_PEER
  }

  auth_options = {}
  auth_options[:bearer_token] = File.read(@bearer_token_file) if @bearer_token_file
  logger.debug("kubernetes_url : #{kubernetes_url} and api_version: #{api_version}")
  Kubeclient::Client.new(
    kubernetes_url, @api_version,
    ssl_options: ssl_options,
    auth_options: auth_options
  )
rescue StandardError => e
  logger.error("Error while creating default kube client - #{e}")
  raise e
end

.get_clients ⇒ Object 



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# File 'lib/util/kube_client.rb', line 137

def get_clients
  @kube_clients
end

.initialize_config(kube_config_hash) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 33

def initialize_config(kube_config_hash)
  @kube_config_hash = kube_config_hash

  unless @kube_config_hash[:kube_config_location].nil?
    begin
      config = Kubeclient::Config.read @kube_config_hash[:kube_config_location]
      @current_kube_context = config.context
    rescue StandardError => e
      logger.error("Error while initializing config params for kube client - #{e}")
      raise e
    end
  end

  @kubernetes_url = @kube_config_hash[:kubernetes_url]
  @api_endpoint = @kube_config_hash[:api_endpoint]
  @api_version = @kube_config_hash[:api_version]
  @client_cert = @kube_config_hash[:client_cert]
  @client_key = @kube_config_hash[:client_key]
  @ca_file = @kube_config_hash[:ca_file]
  @verify_ssl = @kube_config_hash[:verify_ssl]
  @bearer_token_file = @kube_config_hash[:bearer_token_file]
  @secret_dir = @kube_config_hash[:secret_dir]
end

.set_clients(core_client, apps_client, batch_client, discover_v1_client) ⇒ Object 



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# File 'lib/util/kube_client.rb', line 128

def set_clients(core_client, apps_client, batch_client, discover_v1_client)
  @kube_clients = {
    core_client: core_client,
    apps_client: apps_client,
    batch_client: batch_client,
    discover_v1_client: discover_v1_client
  }
end