mirror of
https://github.com/prometheus/prometheus.git
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266 lines
8 KiB
Go
266 lines
8 KiB
Go
// Copyright 2015 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 gce
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import (
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"context"
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/model"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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compute "google.golang.org/api/compute/v1"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/util/strutil"
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)
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const (
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gceLabel = model.MetaLabelPrefix + "gce_"
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gceLabelProject = gceLabel + "project"
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gceLabelZone = gceLabel + "zone"
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gceLabelNetwork = gceLabel + "network"
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gceLabelSubnetwork = gceLabel + "subnetwork"
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gceLabelPublicIP = gceLabel + "public_ip"
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gceLabelPrivateIP = gceLabel + "private_ip"
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gceLabelInstanceName = gceLabel + "instance_name"
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gceLabelInstanceStatus = gceLabel + "instance_status"
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gceLabelTags = gceLabel + "tags"
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gceLabelMetadata = gceLabel + "metadata_"
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gceLabelLabel = gceLabel + "label_"
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gceLabelMachineType = gceLabel + "machine_type"
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)
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var (
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gceSDRefreshFailuresCount = prometheus.NewCounter(
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prometheus.CounterOpts{
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Name: "prometheus_sd_gce_refresh_failures_total",
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Help: "The number of GCE-SD refresh failures.",
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})
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gceSDRefreshDuration = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Name: "prometheus_sd_gce_refresh_duration",
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Help: "The duration of a GCE-SD refresh in seconds.",
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})
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// DefaultSDConfig is the default GCE SD configuration.
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DefaultSDConfig = SDConfig{
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Port: 80,
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TagSeparator: ",",
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RefreshInterval: model.Duration(60 * time.Second),
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}
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)
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// SDConfig is the configuration for GCE based service discovery.
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type SDConfig struct {
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// Project: The Google Cloud Project ID
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Project string `yaml:"project"`
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// Zone: The zone of the scrape targets.
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// If you need to configure multiple zones use multiple gce_sd_configs
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Zone string `yaml:"zone"`
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// Filter: Can be used optionally to filter the instance list by other criteria.
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// Syntax of this filter string is described here in the filter query parameter section:
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// https://cloud.google.com/compute/docs/reference/latest/instances/list
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Filter string `yaml:"filter,omitempty"`
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RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
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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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// 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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if c.Project == "" {
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return fmt.Errorf("GCE SD configuration requires a project")
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}
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if c.Zone == "" {
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return fmt.Errorf("GCE SD configuration requires a zone")
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}
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return nil
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}
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func init() {
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prometheus.MustRegister(gceSDRefreshFailuresCount)
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prometheus.MustRegister(gceSDRefreshDuration)
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}
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// Discovery periodically performs GCE-SD requests. It implements
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// the Discoverer interface.
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type Discovery struct {
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project string
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zone string
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filter string
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client *http.Client
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svc *compute.Service
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isvc *compute.InstancesService
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interval time.Duration
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port int
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tagSeparator string
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logger log.Logger
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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) (*Discovery, error) {
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if logger == nil {
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logger = log.NewNopLogger()
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}
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gd := &Discovery{
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project: conf.Project,
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zone: conf.Zone,
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filter: conf.Filter,
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interval: time.Duration(conf.RefreshInterval),
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port: conf.Port,
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tagSeparator: conf.TagSeparator,
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logger: logger,
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}
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var err error
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gd.client, err = google.DefaultClient(oauth2.NoContext, compute.ComputeReadonlyScope)
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if err != nil {
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return nil, fmt.Errorf("error setting up communication with GCE service: %s", err)
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}
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gd.svc, err = compute.New(gd.client)
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if err != nil {
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return nil, fmt.Errorf("error setting up communication with GCE service: %s", err)
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}
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gd.isvc = compute.NewInstancesService(gd.svc)
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return gd, nil
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}
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// Run implements the Discoverer interface.
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func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
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// Get an initial set right away.
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tg, err := d.refresh()
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if err != nil {
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level.Error(d.logger).Log("msg", "Refresh failed", "err", err)
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} else {
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select {
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case ch <- []*targetgroup.Group{tg}:
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case <-ctx.Done():
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}
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}
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ticker := time.NewTicker(d.interval)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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tg, err := d.refresh()
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if err != nil {
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level.Error(d.logger).Log("msg", "Refresh failed", "err", err)
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continue
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}
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select {
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case ch <- []*targetgroup.Group{tg}:
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case <-ctx.Done():
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}
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case <-ctx.Done():
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return
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}
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}
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}
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func (d *Discovery) refresh() (tg *targetgroup.Group, err error) {
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t0 := time.Now()
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defer func() {
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gceSDRefreshDuration.Observe(time.Since(t0).Seconds())
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if err != nil {
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gceSDRefreshFailuresCount.Inc()
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}
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}()
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tg = &targetgroup.Group{
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Source: fmt.Sprintf("GCE_%s_%s", d.project, d.zone),
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}
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ilc := d.isvc.List(d.project, d.zone)
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if len(d.filter) > 0 {
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ilc = ilc.Filter(d.filter)
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}
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err = ilc.Pages(context.TODO(), func(l *compute.InstanceList) error {
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for _, inst := range l.Items {
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if len(inst.NetworkInterfaces) == 0 {
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continue
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}
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labels := model.LabelSet{
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gceLabelProject: model.LabelValue(d.project),
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gceLabelZone: model.LabelValue(inst.Zone),
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gceLabelInstanceName: model.LabelValue(inst.Name),
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gceLabelInstanceStatus: model.LabelValue(inst.Status),
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gceLabelMachineType: model.LabelValue(inst.MachineType),
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}
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priIface := inst.NetworkInterfaces[0]
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labels[gceLabelNetwork] = model.LabelValue(priIface.Network)
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labels[gceLabelSubnetwork] = model.LabelValue(priIface.Subnetwork)
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labels[gceLabelPrivateIP] = model.LabelValue(priIface.NetworkIP)
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addr := fmt.Sprintf("%s:%d", priIface.NetworkIP, d.port)
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labels[model.AddressLabel] = model.LabelValue(addr)
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// Tags in GCE are usually only used for networking rules.
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if inst.Tags != nil && len(inst.Tags.Items) > 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(inst.Tags.Items, d.tagSeparator) + d.tagSeparator
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labels[gceLabelTags] = model.LabelValue(tags)
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}
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// GCE metadata are key-value pairs for user supplied attributes.
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if inst.Metadata != nil {
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for _, i := range inst.Metadata.Items {
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// Protect against occasional nil pointers.
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if i.Value == nil {
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continue
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}
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name := strutil.SanitizeLabelName(i.Key)
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labels[gceLabelMetadata+model.LabelName(name)] = model.LabelValue(*i.Value)
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}
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}
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// GCE labels are key-value pairs that group associated resources
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if inst.Labels != nil {
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for key, value := range inst.Labels {
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name := strutil.SanitizeLabelName(key)
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labels[gceLabelLabel+model.LabelName(name)] = model.LabelValue(value)
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}
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}
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if len(priIface.AccessConfigs) > 0 {
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ac := priIface.AccessConfigs[0]
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if ac.Type == "ONE_TO_ONE_NAT" {
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labels[gceLabelPublicIP] = model.LabelValue(ac.NatIP)
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}
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}
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tg.Targets = append(tg.Targets, labels)
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}
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return nil
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})
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if err != nil {
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return tg, fmt.Errorf("error retrieving refresh targets from gce: %s", err)
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}
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return tg, nil
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}
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