81 lines
2.6 KiB
Go
81 lines
2.6 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package image
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import (
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"context"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/client"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/module/docker"
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)
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// init registers the MetricSet with the central registry.
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// The New method will be called after the setup of the module and before starting to fetch data
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func init() {
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mb.Registry.MustAddMetricSet("docker", "image", New,
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mb.WithHostParser(docker.HostParser),
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)
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}
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// MetricSet type defines all fields of the MetricSet
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// As a minimum it must inherit the mb.BaseMetricSet fields, but can be extended with
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// additional entries. These variables can be used to persist data or configuration between
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// multiple fetch calls.
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type MetricSet struct {
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mb.BaseMetricSet
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dockerClient *client.Client
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dedot bool
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}
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// New create a new instance of the MetricSet
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// Part of new is also setting up the configuration by processing additional
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// configuration entries if needed.
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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config := docker.DefaultConfig()
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if err := base.Module().UnpackConfig(&config); err != nil {
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return nil, err
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}
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client, err := docker.NewDockerClient(base.HostData().URI, config)
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if err != nil {
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return nil, err
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}
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return &MetricSet{
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BaseMetricSet: base,
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dockerClient: client,
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dedot: config.DeDot,
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}, nil
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}
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// Fetch methods implements the data gathering and data conversion to the right format
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// It returns the event which is then forward to the output. In case of an error, a
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// descriptive error must be returned.
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func (m *MetricSet) Fetch() ([]common.MapStr, error) {
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images, err := m.dockerClient.ImageList(context.TODO(), types.ImageListOptions{})
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if err != nil {
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return nil, err
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}
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return eventsMapping(images, m.dedot), nil
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}
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