Module: KubernetesMetadata::WatchPods

Includes:
Common
Included in:
Fluent::Plugin::KubernetesMetadataFilter
Defined in:
lib/fluent/plugin/kubernetes_metadata_watch_pods.rb

Instance Method Summary collapse

Methods included from Common

#match_annotations, #parse_namespace_metadata, #parse_pod_metadata, #syms_to_strs

Instance Method Details

#start_pod_watch ⇒ Object 



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

def start_pod_watch
  begin
    resource_version = @client.get_pods.resourceVersion
    watcher          = @client.watch_pods(resource_version)
  rescue Exception => e
    message = "Exception encountered fetching metadata from Kubernetes API endpoint: #{e.message}"
    message += " (#{e.response})" if e.respond_to?(:response)

    raise Fluent::ConfigError, message
  end

  watcher.each do |notice|
    case notice.type
      when 'MODIFIED'
        cache_key = notice.object['metadata']['uid']
        cached    = @cache[cache_key]
        if cached
          @cache[cache_key] = parse_pod_metadata(notice.object)
          @stats.bump(:pod_cache_watch_updates)
        elsif ENV['K8S_NODE_NAME'] == notice.object['spec']['nodeName'] then
          @cache[cache_key] = parse_pod_metadata(notice.object)
          @stats.bump(:pod_cache_host_updates)
        else
          @stats.bump(:pod_cache_watch_misses)
        end
      when 'DELETED'
        # ignore and let age out for cases where pods
        # deleted but still processing logs
        @stats.bump(:pod_cache_watch_delete_ignored)
      else
        # Don't pay attention to creations, since the created pod may not
        # end up on this node.
        @stats.bump(:pod_cache_watch_ignored)
    end
  end
end