Module: KubernetesMetadata::CacheStrategy

Included in:
Fluent::Plugin::KubernetesMetadataFilter
Defined in:
lib/fluent/plugin/kubernetes_metadata_cache_strategy.rb

Instance Method Summary collapse

Instance Method Details

#get_pod_metadata(key, namespace_name, pod_name, record_create_time, batch_miss_cache) ⇒ Object 



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# File 'lib/fluent/plugin/kubernetes_metadata_cache_strategy.rb', line 21

def get_pod_metadata(key, namespace_name, pod_name, record_create_time, batch_miss_cache)
  metadata = {}
  ids = @id_cache[key]
  if !ids.nil?
    # FAST PATH
    # Cache hit, fetch metadata from the cache
    metadata = @cache.fetch(ids[:pod_id]) do
      @stats.bump(:pod_cache_miss)
      m = fetch_pod_metadata(namespace_name, pod_name)
      (m.nil? || m.empty?) ? {'pod_id'=>ids[:pod_id]} : m
    end
    metadata.merge!(@namespace_cache.fetch(ids[:namespace_id]) do
      @stats.bump(:namespace_cache_miss)
      m = fetch_namespace_metadata(namespace_name) unless @skip_namespace_metadata
      (m.nil? || m.empty?) ?  {'namespace_id'=>ids[:namespace_id]} : m
    end)
  else
    # SLOW PATH
    @stats.bump(:id_cache_miss)
    return batch_miss_cache["#{namespace_name}_#{pod_name}"] if batch_miss_cache.key?("#{namespace_name}_#{pod_name}")
    pod_metadata = fetch_pod_metadata(namespace_name, pod_name)
    if @skip_namespace_metadata
      ids = { :pod_id=> pod_metadata['pod_id'] }
      @id_cache[key] = ids
      return pod_metadata
    end
    namespace_metadata = fetch_namespace_metadata(namespace_name)
    ids = { :pod_id=> pod_metadata['pod_id'], :namespace_id => namespace_metadata['namespace_id'] }
    if !ids[:pod_id].nil? && !ids[:namespace_id].nil?
      # pod found and namespace found
      metadata = pod_metadata
      metadata.merge!(namespace_metadata)
    else
      if ids[:pod_id].nil? && !ids[:namespace_id].nil?
        # pod not found, but namespace found
        @stats.bump(:id_cache_pod_not_found_namespace)
        ns_time = Time.parse(namespace_metadata['creation_timestamp'])
        if ns_time <= record_create_time
          # namespace is older then record for pod
          ids[:pod_id] = key
          metadata = @cache.fetch(ids[:pod_id]) do
            m = { 'pod_id' => ids[:pod_id] }
          end
        end
        metadata.merge!(namespace_metadata)
      else
        if !ids[:pod_id].nil? && ids[:namespace_id].nil?
          # pod found, but namespace NOT found
          # this should NEVER be possible since pod meta can
          # only be retrieved with a namespace
          @stats.bump(:id_cache_namespace_not_found_pod)
        else
          # nothing found
          @stats.bump(:id_cache_orphaned_record)
        end
        if @allow_orphans
          log.trace("orphaning message for: #{namespace_name}/#{pod_name} ") if log.trace?
          metadata = {
            'orphaned_namespace' => namespace_name,
            'namespace_name' => @orphaned_namespace_name,
            'namespace_id' => @orphaned_namespace_id
          }
        else
          metadata = {}
        end
        batch_miss_cache["#{namespace_name}_#{pod_name}"] = metadata
      end
    end
    @id_cache[key] = ids unless batch_miss_cache.key?("#{namespace_name}_#{pod_name}")
  end

  # remove namespace info that is only used for comparison
  metadata.delete('creation_timestamp')
  metadata.delete_if{|k,v| v.nil?}
end