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343 lines
12 KiB
343 lines
12 KiB
// Copyright 2021 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linode
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/go-kit/log"
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"github.com/linode/linodego"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/prometheus/common/version"
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"github.com/prometheus/prometheus/discovery"
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"github.com/prometheus/prometheus/discovery/refresh"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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)
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const (
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linodeLabel = model.MetaLabelPrefix + "linode_"
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linodeLabelID = linodeLabel + "instance_id"
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linodeLabelName = linodeLabel + "instance_label"
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linodeLabelImage = linodeLabel + "image"
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linodeLabelPrivateIPv4 = linodeLabel + "private_ipv4"
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linodeLabelPublicIPv4 = linodeLabel + "public_ipv4"
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linodeLabelPublicIPv6 = linodeLabel + "public_ipv6"
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linodeLabelPrivateIPv4RDNS = linodeLabel + "private_ipv4_rdns"
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linodeLabelPublicIPv4RDNS = linodeLabel + "public_ipv4_rdns"
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linodeLabelPublicIPv6RDNS = linodeLabel + "public_ipv6_rdns"
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linodeLabelRegion = linodeLabel + "region"
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linodeLabelType = linodeLabel + "type"
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linodeLabelStatus = linodeLabel + "status"
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linodeLabelTags = linodeLabel + "tags"
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linodeLabelGroup = linodeLabel + "group"
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linodeLabelGPUs = linodeLabel + "gpus"
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linodeLabelHypervisor = linodeLabel + "hypervisor"
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linodeLabelBackups = linodeLabel + "backups"
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linodeLabelSpecsDiskBytes = linodeLabel + "specs_disk_bytes"
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linodeLabelSpecsMemoryBytes = linodeLabel + "specs_memory_bytes"
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linodeLabelSpecsVCPUs = linodeLabel + "specs_vcpus"
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linodeLabelSpecsTransferBytes = linodeLabel + "specs_transfer_bytes"
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linodeLabelExtraIPs = linodeLabel + "extra_ips"
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// This is our events filter; when polling for changes, we care only about
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// events since our last refresh.
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// Docs: https://www.linode.com/docs/api/account/#events-list
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filterTemplate = `{"created": {"+gte": "%s"}}`
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)
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// DefaultSDConfig is the default Linode SD configuration.
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var DefaultSDConfig = SDConfig{
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TagSeparator: ",",
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Port: 80,
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RefreshInterval: model.Duration(60 * time.Second),
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HTTPClientConfig: config.DefaultHTTPClientConfig,
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}
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func init() {
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discovery.RegisterConfig(&SDConfig{})
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}
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// SDConfig is the configuration for Linode based service discovery.
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type SDConfig struct {
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HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
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RefreshInterval model.Duration `yaml:"refresh_interval"`
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Port int `yaml:"port"`
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TagSeparator string `yaml:"tag_separator,omitempty"`
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}
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// NewDiscovererMetrics implements discovery.Config.
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func (*SDConfig) NewDiscovererMetrics(reg prometheus.Registerer, rmi discovery.RefreshMetricsInstantiator) discovery.DiscovererMetrics {
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return newDiscovererMetrics(reg, rmi)
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}
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// Name returns the name of the Config.
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func (*SDConfig) Name() string { return "linode" }
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// NewDiscoverer returns a Discoverer for the Config.
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func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
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return NewDiscovery(c, opts.Logger, opts.Metrics)
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}
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// SetDirectory joins any relative file paths with dir.
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func (c *SDConfig) SetDirectory(dir string) {
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c.HTTPClientConfig.SetDirectory(dir)
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
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*c = DefaultSDConfig
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type plain SDConfig
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err := unmarshal((*plain)(c))
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if err != nil {
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return err
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}
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return c.HTTPClientConfig.Validate()
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}
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// Discovery periodically performs Linode requests. It implements
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// the Discoverer interface.
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type Discovery struct {
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*refresh.Discovery
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client *linodego.Client
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port int
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tagSeparator string
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lastRefreshTimestamp time.Time
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pollCount int
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lastResults []*targetgroup.Group
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eventPollingEnabled bool
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metrics *linodeMetrics
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}
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// NewDiscovery returns a new Discovery which periodically refreshes its targets.
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func NewDiscovery(conf *SDConfig, logger log.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
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m, ok := metrics.(*linodeMetrics)
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if !ok {
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return nil, fmt.Errorf("invalid discovery metrics type")
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}
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d := &Discovery{
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port: conf.Port,
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tagSeparator: conf.TagSeparator,
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pollCount: 0,
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lastRefreshTimestamp: time.Now().UTC(),
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eventPollingEnabled: true,
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metrics: m,
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}
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rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "linode_sd")
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if err != nil {
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return nil, err
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}
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client := linodego.NewClient(
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&http.Client{
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Transport: rt,
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Timeout: time.Duration(conf.RefreshInterval),
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},
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)
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client.SetUserAgent(fmt.Sprintf("Prometheus/%s", version.Version))
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d.client = &client
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d.Discovery = refresh.NewDiscovery(
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refresh.Options{
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Logger: logger,
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Mech: "linode",
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Interval: time.Duration(conf.RefreshInterval),
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RefreshF: d.refresh,
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MetricsInstantiator: m.refreshMetrics,
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},
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)
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return d, nil
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}
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func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
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needsRefresh := true
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ts := time.Now().UTC()
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if d.lastResults != nil && d.eventPollingEnabled {
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// Check to see if there have been any events. If so, refresh our data.
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opts := linodego.ListOptions{
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PageOptions: &linodego.PageOptions{Page: 1},
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PageSize: 25,
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Filter: fmt.Sprintf(filterTemplate, d.lastRefreshTimestamp.Format("2006-01-02T15:04:05")),
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}
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events, err := d.client.ListEvents(ctx, &opts)
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if err != nil {
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var e *linodego.Error
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if errors.As(err, &e) && e.Code == http.StatusUnauthorized {
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// If we get a 401, the token doesn't have `events:read_only` scope.
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// Disable event polling and fallback to doing a full refresh every interval.
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d.eventPollingEnabled = false
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} else {
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return nil, err
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}
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} else {
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// Event polling tells us changes the Linode API is aware of. Actions issued outside of the Linode API,
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// such as issuing a `shutdown` at the VM's console instead of using the API to power off an instance,
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// can potentially cause us to return stale data. Just in case, trigger a full refresh after ~10 polling
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// intervals of no events.
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d.pollCount++
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if len(events) == 0 && d.pollCount < 10 {
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needsRefresh = false
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}
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}
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}
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if needsRefresh {
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newData, err := d.refreshData(ctx)
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if err != nil {
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return nil, err
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}
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d.pollCount = 0
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d.lastResults = newData
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}
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d.lastRefreshTimestamp = ts
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return d.lastResults, nil
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}
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func (d *Discovery) refreshData(ctx context.Context) ([]*targetgroup.Group, error) {
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tg := &targetgroup.Group{
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Source: "Linode",
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}
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// Gather all linode instances.
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instances, err := d.client.ListInstances(ctx, &linodego.ListOptions{PageSize: 500})
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if err != nil {
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d.metrics.failuresCount.Inc()
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return nil, err
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}
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// Gather detailed IP address info for all IPs on all linode instances.
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detailedIPs, err := d.client.ListIPAddresses(ctx, &linodego.ListOptions{PageSize: 500})
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if err != nil {
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d.metrics.failuresCount.Inc()
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return nil, err
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}
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for _, instance := range instances {
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if len(instance.IPv4) == 0 {
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continue
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}
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var (
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privateIPv4, publicIPv4, publicIPv6 string
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privateIPv4RDNS, publicIPv4RDNS, publicIPv6RDNS string
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backupsStatus string
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extraIPs []string
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)
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for _, ip := range instance.IPv4 {
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for _, detailedIP := range detailedIPs {
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if detailedIP.Address != ip.String() {
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continue
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}
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switch {
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case detailedIP.Public && publicIPv4 == "":
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publicIPv4 = detailedIP.Address
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if detailedIP.RDNS != "" && detailedIP.RDNS != "null" {
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publicIPv4RDNS = detailedIP.RDNS
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}
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case !detailedIP.Public && privateIPv4 == "":
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privateIPv4 = detailedIP.Address
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if detailedIP.RDNS != "" && detailedIP.RDNS != "null" {
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privateIPv4RDNS = detailedIP.RDNS
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}
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default:
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extraIPs = append(extraIPs, detailedIP.Address)
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}
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}
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}
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if instance.IPv6 != "" {
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for _, detailedIP := range detailedIPs {
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if detailedIP.Address != strings.Split(instance.IPv6, "/")[0] {
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continue
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}
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publicIPv6 = detailedIP.Address
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if detailedIP.RDNS != "" && detailedIP.RDNS != "null" {
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publicIPv6RDNS = detailedIP.RDNS
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}
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}
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}
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if instance.Backups.Enabled {
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backupsStatus = "enabled"
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} else {
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backupsStatus = "disabled"
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}
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labels := model.LabelSet{
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linodeLabelID: model.LabelValue(fmt.Sprintf("%d", instance.ID)),
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linodeLabelName: model.LabelValue(instance.Label),
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linodeLabelImage: model.LabelValue(instance.Image),
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linodeLabelPrivateIPv4: model.LabelValue(privateIPv4),
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linodeLabelPublicIPv4: model.LabelValue(publicIPv4),
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linodeLabelPublicIPv6: model.LabelValue(publicIPv6),
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linodeLabelPrivateIPv4RDNS: model.LabelValue(privateIPv4RDNS),
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linodeLabelPublicIPv4RDNS: model.LabelValue(publicIPv4RDNS),
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linodeLabelPublicIPv6RDNS: model.LabelValue(publicIPv6RDNS),
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linodeLabelRegion: model.LabelValue(instance.Region),
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linodeLabelType: model.LabelValue(instance.Type),
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linodeLabelStatus: model.LabelValue(instance.Status),
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linodeLabelGroup: model.LabelValue(instance.Group),
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linodeLabelGPUs: model.LabelValue(fmt.Sprintf("%d", instance.Specs.GPUs)),
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linodeLabelHypervisor: model.LabelValue(instance.Hypervisor),
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linodeLabelBackups: model.LabelValue(backupsStatus),
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linodeLabelSpecsDiskBytes: model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Disk)<<20)),
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linodeLabelSpecsMemoryBytes: model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Memory)<<20)),
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linodeLabelSpecsVCPUs: model.LabelValue(fmt.Sprintf("%d", instance.Specs.VCPUs)),
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linodeLabelSpecsTransferBytes: model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Transfer)<<20)),
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}
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addr := net.JoinHostPort(publicIPv4, strconv.FormatUint(uint64(d.port), 10))
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labels[model.AddressLabel] = model.LabelValue(addr)
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if len(instance.Tags) > 0 {
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// We surround the separated list with the separator as well. This way regular expressions
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// in relabeling rules don't have to consider tag positions.
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tags := d.tagSeparator + strings.Join(instance.Tags, d.tagSeparator) + d.tagSeparator
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labels[linodeLabelTags] = model.LabelValue(tags)
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}
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if len(extraIPs) > 0 {
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// This instance has more than one of at least one type of IP address (public, private,
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// IPv4, IPv6, etc. We provide those extra IPs found here just like we do for instance
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// tags, we surround a separated list with the tagSeparator config.
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ips := d.tagSeparator + strings.Join(extraIPs, d.tagSeparator) + d.tagSeparator
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labels[linodeLabelExtraIPs] = model.LabelValue(ips)
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}
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tg.Targets = append(tg.Targets, labels)
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}
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return []*targetgroup.Group{tg}, nil
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}
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