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digitalocean.go
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digitalocean.go
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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package digitalocean
import (
"context"
"fmt"
"net"
"net/http"
"strconv"
"strings"
"time"
"github.com/digitalocean/godo"
"github.com/go-kit/log"
"github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/common/version"
"github.com/mkby/prometheus/discovery"
"github.com/mkby/prometheus/discovery/refresh"
"github.com/mkby/prometheus/discovery/targetgroup"
)
const (
doLabel = model.MetaLabelPrefix + "digitalocean_"
doLabelID = doLabel + "droplet_id"
doLabelName = doLabel + "droplet_name"
doLabelImage = doLabel + "image"
doLabelImageName = doLabel + "image_name"
doLabelPrivateIPv4 = doLabel + "private_ipv4"
doLabelPublicIPv4 = doLabel + "public_ipv4"
doLabelPublicIPv6 = doLabel + "public_ipv6"
doLabelRegion = doLabel + "region"
doLabelSize = doLabel + "size"
doLabelStatus = doLabel + "status"
doLabelFeatures = doLabel + "features"
doLabelTags = doLabel + "tags"
doLabelVPC = doLabel + "vpc"
separator = ","
)
// DefaultSDConfig is the default DigitalOcean SD configuration.
var DefaultSDConfig = SDConfig{
Port: 80,
RefreshInterval: model.Duration(60 * time.Second),
HTTPClientConfig: config.DefaultHTTPClientConfig,
}
func init() {
discovery.RegisterConfig(&SDConfig{})
}
// SDConfig is the configuration for DigitalOcean based service discovery.
type SDConfig struct {
HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
RefreshInterval model.Duration `yaml:"refresh_interval"`
Port int `yaml:"port"`
}
// Name returns the name of the Config.
func (*SDConfig) Name() string { return "digitalocean" }
// NewDiscoverer returns a Discoverer for the Config.
func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
return NewDiscovery(c, opts.Logger)
}
// SetDirectory joins any relative file paths with dir.
func (c *SDConfig) SetDirectory(dir string) {
c.HTTPClientConfig.SetDirectory(dir)
}
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
*c = DefaultSDConfig
type plain SDConfig
err := unmarshal((*plain)(c))
if err != nil {
return err
}
return c.HTTPClientConfig.Validate()
}
// Discovery periodically performs DigitalOcean requests. It implements
// the Discoverer interface.
type Discovery struct {
*refresh.Discovery
client *godo.Client
port int
}
// NewDiscovery returns a new Discovery which periodically refreshes its targets.
func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
d := &Discovery{
port: conf.Port,
}
rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "digitalocean_sd", config.WithHTTP2Disabled())
if err != nil {
return nil, err
}
d.client, err = godo.New(
&http.Client{
Transport: rt,
Timeout: time.Duration(conf.RefreshInterval),
},
godo.SetUserAgent(fmt.Sprintf("Prometheus/%s", version.Version)),
)
if err != nil {
return nil, fmt.Errorf("error setting up digital ocean agent: %w", err)
}
d.Discovery = refresh.NewDiscovery(
logger,
"digitalocean",
time.Duration(conf.RefreshInterval),
d.refresh,
)
return d, nil
}
func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
tg := &targetgroup.Group{
Source: "DigitalOcean",
}
droplets, err := d.listDroplets()
if err != nil {
return nil, err
}
for _, droplet := range droplets {
if droplet.Networks == nil || len(droplet.Networks.V4) == 0 {
continue
}
privateIPv4, err := droplet.PrivateIPv4()
if err != nil {
return nil, fmt.Errorf("error while reading private IPv4 of droplet %d: %w", droplet.ID, err)
}
publicIPv4, err := droplet.PublicIPv4()
if err != nil {
return nil, fmt.Errorf("error while reading public IPv4 of droplet %d: %w", droplet.ID, err)
}
publicIPv6, err := droplet.PublicIPv6()
if err != nil {
return nil, fmt.Errorf("error while reading public IPv6 of droplet %d: %w", droplet.ID, err)
}
labels := model.LabelSet{
doLabelID: model.LabelValue(fmt.Sprintf("%d", droplet.ID)),
doLabelName: model.LabelValue(droplet.Name),
doLabelImage: model.LabelValue(droplet.Image.Slug),
doLabelImageName: model.LabelValue(droplet.Image.Name),
doLabelPrivateIPv4: model.LabelValue(privateIPv4),
doLabelPublicIPv4: model.LabelValue(publicIPv4),
doLabelPublicIPv6: model.LabelValue(publicIPv6),
doLabelRegion: model.LabelValue(droplet.Region.Slug),
doLabelSize: model.LabelValue(droplet.SizeSlug),
doLabelStatus: model.LabelValue(droplet.Status),
doLabelVPC: model.LabelValue(droplet.VPCUUID),
}
addr := net.JoinHostPort(publicIPv4, strconv.FormatUint(uint64(d.port), 10))
labels[model.AddressLabel] = model.LabelValue(addr)
if len(droplet.Features) > 0 {
// We surround the separated list with the separator as well. This way regular expressions
// in relabeling rules don't have to consider feature positions.
features := separator + strings.Join(droplet.Features, separator) + separator
labels[doLabelFeatures] = model.LabelValue(features)
}
if len(droplet.Tags) > 0 {
// We surround the separated list with the separator as well. This way regular expressions
// in relabeling rules don't have to consider tag positions.
tags := separator + strings.Join(droplet.Tags, separator) + separator
labels[doLabelTags] = model.LabelValue(tags)
}
tg.Targets = append(tg.Targets, labels)
}
return []*targetgroup.Group{tg}, nil
}
func (d *Discovery) listDroplets() ([]godo.Droplet, error) {
var (
droplets []godo.Droplet
opts = &godo.ListOptions{}
)
for {
paginatedDroplets, resp, err := d.client.Droplets.List(context.Background(), opts)
if err != nil {
return nil, fmt.Errorf("error while listing droplets page %d: %w", opts.Page, err)
}
droplets = append(droplets, paginatedDroplets...)
if resp.Links == nil || resp.Links.IsLastPage() {
break
}
page, err := resp.Links.CurrentPage()
if err != nil {
return nil, err
}
opts.Page = page + 1
}
return droplets, nil
}