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311 lines
9.0 KiB
311 lines
9.0 KiB
// 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 ec2
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
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"github.com/aws/aws-sdk-go/aws/ec2metadata"
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"github.com/aws/aws-sdk-go/aws/session"
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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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"github.com/aws/aws-sdk-go/service/ec2"
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config_util "github.com/prometheus/common/config"
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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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ec2Label = model.MetaLabelPrefix + "ec2_"
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ec2LabelAZ = ec2Label + "availability_zone"
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ec2LabelInstanceID = ec2Label + "instance_id"
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ec2LabelInstanceState = ec2Label + "instance_state"
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ec2LabelInstanceType = ec2Label + "instance_type"
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ec2LabelOwnerID = ec2Label + "owner_id"
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ec2LabelPlatform = ec2Label + "platform"
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ec2LabelPublicDNS = ec2Label + "public_dns_name"
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ec2LabelPublicIP = ec2Label + "public_ip"
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ec2LabelPrivateDNS = ec2Label + "private_dns_name"
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ec2LabelPrivateIP = ec2Label + "private_ip"
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ec2LabelPrimarySubnetID = ec2Label + "primary_subnet_id"
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ec2LabelSubnetID = ec2Label + "subnet_id"
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ec2LabelTag = ec2Label + "tag_"
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ec2LabelVPCID = ec2Label + "vpc_id"
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subnetSeparator = ","
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)
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var (
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ec2SDRefreshFailuresCount = prometheus.NewCounter(
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prometheus.CounterOpts{
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Name: "prometheus_sd_ec2_refresh_failures_total",
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Help: "The number of EC2-SD scrape failures.",
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})
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ec2SDRefreshDuration = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Name: "prometheus_sd_ec2_refresh_duration_seconds",
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Help: "The duration of a EC2-SD refresh in seconds.",
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})
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// DefaultSDConfig is the default EC2 SD configuration.
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DefaultSDConfig = SDConfig{
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Port: 80,
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RefreshInterval: model.Duration(60 * time.Second),
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}
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)
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// Filter is the configuration for filtering EC2 instances.
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type Filter struct {
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Name string `yaml:"name"`
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Values []string `yaml:"values"`
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}
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// SDConfig is the configuration for EC2 based service discovery.
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type SDConfig struct {
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Endpoint string `yaml:"endpoint"`
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Region string `yaml:"region"`
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AccessKey string `yaml:"access_key,omitempty"`
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SecretKey config_util.Secret `yaml:"secret_key,omitempty"`
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Profile string `yaml:"profile,omitempty"`
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RoleARN string `yaml:"role_arn,omitempty"`
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RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
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Port int `yaml:"port"`
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Filters []*Filter `yaml:"filters"`
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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.Region == "" {
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sess, err := session.NewSession()
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if err != nil {
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return err
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}
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metadata := ec2metadata.New(sess)
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region, err := metadata.Region()
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if err != nil {
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return fmt.Errorf("EC2 SD configuration requires a region")
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}
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c.Region = region
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}
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for _, f := range c.Filters {
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if len(f.Values) == 0 {
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return fmt.Errorf("EC2 SD configuration filter values cannot be empty")
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}
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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(ec2SDRefreshFailuresCount)
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prometheus.MustRegister(ec2SDRefreshDuration)
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}
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// Discovery periodically performs EC2-SD requests. It implements
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// the Discoverer interface.
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type Discovery struct {
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aws *aws.Config
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interval time.Duration
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profile string
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roleARN string
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port int
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filters []*Filter
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logger log.Logger
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}
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// NewDiscovery returns a new EC2Discovery which periodically refreshes its targets.
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func NewDiscovery(conf *SDConfig, logger log.Logger) *Discovery {
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creds := credentials.NewStaticCredentials(conf.AccessKey, string(conf.SecretKey), "")
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if conf.AccessKey == "" && conf.SecretKey == "" {
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creds = nil
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}
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if logger == nil {
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logger = log.NewNopLogger()
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}
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return &Discovery{
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aws: &aws.Config{
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Endpoint: &conf.Endpoint,
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Region: &conf.Region,
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Credentials: creds,
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},
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profile: conf.Profile,
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roleARN: conf.RoleARN,
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filters: conf.Filters,
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interval: time.Duration(conf.RefreshInterval),
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port: conf.Port,
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logger: logger,
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}
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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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ticker := time.NewTicker(d.interval)
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defer ticker.Stop()
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// Get an initial set right away.
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tg, err := d.refresh(ctx)
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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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return
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}
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}
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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(ctx)
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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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return
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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(ctx context.Context) (tg *targetgroup.Group, err error) {
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t0 := time.Now()
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defer func() {
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ec2SDRefreshDuration.Observe(time.Since(t0).Seconds())
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if err != nil {
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ec2SDRefreshFailuresCount.Inc()
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}
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}()
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sess, err := session.NewSessionWithOptions(session.Options{
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Config: *d.aws,
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Profile: d.profile,
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})
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if err != nil {
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return nil, fmt.Errorf("could not create aws session: %s", err)
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}
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var ec2s *ec2.EC2
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if d.roleARN != "" {
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creds := stscreds.NewCredentials(sess, d.roleARN)
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ec2s = ec2.New(sess, &aws.Config{Credentials: creds})
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} else {
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ec2s = ec2.New(sess)
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}
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tg = &targetgroup.Group{
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Source: *d.aws.Region,
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}
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var filters []*ec2.Filter
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for _, f := range d.filters {
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filters = append(filters, &ec2.Filter{
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Name: aws.String(f.Name),
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Values: aws.StringSlice(f.Values),
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})
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}
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input := &ec2.DescribeInstancesInput{Filters: filters}
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if err = ec2s.DescribeInstancesPagesWithContext(ctx, input, func(p *ec2.DescribeInstancesOutput, lastPage bool) bool {
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for _, r := range p.Reservations {
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for _, inst := range r.Instances {
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if inst.PrivateIpAddress == nil {
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continue
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}
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labels := model.LabelSet{
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ec2LabelInstanceID: model.LabelValue(*inst.InstanceId),
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}
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if r.OwnerId != nil {
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labels[ec2LabelOwnerID] = model.LabelValue(*r.OwnerId)
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}
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labels[ec2LabelPrivateIP] = model.LabelValue(*inst.PrivateIpAddress)
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if inst.PrivateDnsName != nil {
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labels[ec2LabelPrivateDNS] = model.LabelValue(*inst.PrivateDnsName)
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}
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addr := net.JoinHostPort(*inst.PrivateIpAddress, fmt.Sprintf("%d", d.port))
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labels[model.AddressLabel] = model.LabelValue(addr)
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if inst.Platform != nil {
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labels[ec2LabelPlatform] = model.LabelValue(*inst.Platform)
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}
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if inst.PublicIpAddress != nil {
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labels[ec2LabelPublicIP] = model.LabelValue(*inst.PublicIpAddress)
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labels[ec2LabelPublicDNS] = model.LabelValue(*inst.PublicDnsName)
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}
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labels[ec2LabelAZ] = model.LabelValue(*inst.Placement.AvailabilityZone)
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labels[ec2LabelInstanceState] = model.LabelValue(*inst.State.Name)
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labels[ec2LabelInstanceType] = model.LabelValue(*inst.InstanceType)
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if inst.VpcId != nil {
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labels[ec2LabelVPCID] = model.LabelValue(*inst.VpcId)
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labels[ec2LabelPrimarySubnetID] = model.LabelValue(*inst.SubnetId)
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// Deduplicate VPC Subnet IDs maintaining the order of the network interfaces returned by EC2.
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var subnets []string
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subnetsMap := make(map[string]struct{})
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for _, eni := range inst.NetworkInterfaces {
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if eni.SubnetId == nil {
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continue
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}
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if _, ok := subnetsMap[*eni.SubnetId]; !ok {
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subnetsMap[*eni.SubnetId] = struct{}{}
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subnets = append(subnets, *eni.SubnetId)
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}
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}
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labels[ec2LabelSubnetID] = model.LabelValue(
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subnetSeparator +
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strings.Join(subnets, subnetSeparator) +
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subnetSeparator)
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}
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for _, t := range inst.Tags {
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if t == nil || t.Key == nil || t.Value == nil {
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continue
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}
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name := strutil.SanitizeLabelName(*t.Key)
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labels[ec2LabelTag+model.LabelName(name)] = model.LabelValue(*t.Value)
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}
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tg.Targets = append(tg.Targets, labels)
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}
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}
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return true
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}); err != nil {
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return nil, fmt.Errorf("could not describe instances: %s", err)
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}
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return tg, nil
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}
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