mirror of https://github.com/prometheus/prometheus
132 lines
3.6 KiB
Go
132 lines
3.6 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 discovery
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import (
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"fmt"
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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/prometheus/common/log"
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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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"github.com/prometheus/prometheus/config"
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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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ec2LabelInstanceID = ec2Label + "instance_id"
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ec2LabelPublicIP = ec2Label + "public_ip"
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ec2LabelPrivateIP = ec2Label + "private_ip"
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ec2LabelTag = ec2Label + "tag_"
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)
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// EC2Discovery periodically performs EC2-SD requests. It implements
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// the TargetProvider interface.
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type EC2Discovery struct {
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aws *aws.Config
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done chan struct{}
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interval time.Duration
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port int
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}
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// NewEC2Discovery returns a new EC2Discovery which periodically refreshes its targets.
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func NewEC2Discovery(conf *config.EC2SDConfig) *EC2Discovery {
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creds := credentials.NewStaticCredentials(conf.AccessKey, conf.SecretKey, "")
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if conf.AccessKey == "" && conf.SecretKey == "" {
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creds = credentials.NewEnvCredentials()
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}
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return &EC2Discovery{
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aws: &aws.Config{
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Region: &conf.Region,
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Credentials: creds,
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},
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done: make(chan struct{}),
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interval: time.Duration(conf.RefreshInterval),
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port: conf.Port,
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}
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}
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// Run implements the TargetProvider interface.
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func (ed *EC2Discovery) Run(ch chan<- *config.TargetGroup, done <-chan struct{}) {
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defer close(ch)
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ticker := time.NewTicker(ed.interval)
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defer ticker.Stop()
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// Get an initial set right away.
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tg, err := ed.refresh()
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if err != nil {
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log.Error(err)
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} else {
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ch <- tg
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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 := ed.refresh()
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if err != nil {
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log.Error(err)
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} else {
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ch <- tg
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}
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case <-done:
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return
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}
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}
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}
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// Sources implements the TargetProvider interface.
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func (ed *EC2Discovery) Sources() []string {
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return []string{*ed.aws.Region}
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}
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func (ed *EC2Discovery) refresh() (*config.TargetGroup, error) {
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ec2s := ec2.New(ed.aws)
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tg := &config.TargetGroup{
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Source: *ed.aws.Region,
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}
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if err := ec2s.DescribeInstancesPages(nil, 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 inst.PublicIpAddress != nil {
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labels[ec2LabelPublicIP] = model.LabelValue(*inst.PublicIpAddress)
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}
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labels[ec2LabelPrivateIP] = model.LabelValue(*inst.PrivateIpAddress)
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addr := fmt.Sprintf("%s:%d", *inst.PrivateIpAddress, ed.port)
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labels[model.AddressLabel] = model.LabelValue(addr)
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for _, t := range inst.Tags {
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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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