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Merge pull request prometheus#1085 from mjibson/elb
Add SD for Amazon EC2 instances
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright 2015 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 discovery | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-sdk-go/aws" | ||
| "github.com/aws/aws-sdk-go/aws/credentials" | ||
| "github.com/prometheus/common/log" | ||
| "github.com/prometheus/common/model" | ||
|
|
||
| "github.com/aws/aws-sdk-go/service/ec2" | ||
| "github.com/prometheus/prometheus/config" | ||
| "github.com/prometheus/prometheus/util/strutil" | ||
| ) | ||
|
|
||
| const ( | ||
| ec2Label = model.MetaLabelPrefix + "ec2_" | ||
| ec2LabelInstanceID = ec2Label + "instance_id" | ||
| ec2LabelPublicIP = ec2Label + "public_ip" | ||
| ec2LabelPrivateIP = ec2Label + "private_ip" | ||
| ec2LabelTag = ec2Label + "tag_" | ||
| ) | ||
|
|
||
| // EC2Discovery periodically performs EC2-SD requests. It implements | ||
| // the TargetProvider interface. | ||
| type EC2Discovery struct { | ||
| aws *aws.Config | ||
| done chan struct{} | ||
| interval time.Duration | ||
| port int | ||
| } | ||
|
|
||
| // NewEC2Discovery returns a new EC2Discovery which periodically refreshes its targets. | ||
| func NewEC2Discovery(conf *config.EC2SDConfig) *EC2Discovery { | ||
| creds := credentials.NewStaticCredentials(conf.AccessKey, conf.SecretKey, "") | ||
| if conf.AccessKey == "" && conf.SecretKey == "" { | ||
| creds = credentials.NewEnvCredentials() | ||
| } | ||
| return &EC2Discovery{ | ||
| aws: &aws.Config{ | ||
| Region: &conf.Region, | ||
| Credentials: creds, | ||
| }, | ||
| done: make(chan struct{}), | ||
| interval: time.Duration(conf.RefreshInterval), | ||
| port: conf.Port, | ||
| } | ||
| } | ||
|
|
||
| // Run implements the TargetProvider interface. | ||
| func (ed *EC2Discovery) Run(ch chan<- *config.TargetGroup, done <-chan struct{}) { | ||
| defer close(ch) | ||
|
|
||
| ticker := time.NewTicker(ed.interval) | ||
| defer ticker.Stop() | ||
|
|
||
| // Get an initial set right away. | ||
| tg, err := ed.refresh() | ||
| if err != nil { | ||
| log.Error(err) | ||
| } else { | ||
| ch <- tg | ||
| } | ||
|
|
||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| tg, err := ed.refresh() | ||
| if err != nil { | ||
| log.Error(err) | ||
| } else { | ||
| ch <- tg | ||
| } | ||
| case <-done: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Sources implements the TargetProvider interface. | ||
| func (ed *EC2Discovery) Sources() []string { | ||
| return []string{*ed.aws.Region} | ||
| } | ||
|
|
||
| func (ed *EC2Discovery) refresh() (*config.TargetGroup, error) { | ||
| ec2s := ec2.New(ed.aws) | ||
| tg := &config.TargetGroup{ | ||
| Source: *ed.aws.Region, | ||
| } | ||
| if err := ec2s.DescribeInstancesPages(nil, func(p *ec2.DescribeInstancesOutput, lastPage bool) bool { | ||
| for _, r := range p.Reservations { | ||
| for _, inst := range r.Instances { | ||
| if inst.PrivateIpAddress == nil { | ||
| continue | ||
| } | ||
| labels := model.LabelSet{ | ||
| ec2LabelInstanceID: model.LabelValue(*inst.InstanceId), | ||
| } | ||
| if inst.PublicIpAddress != nil { | ||
| labels[ec2LabelPublicIP] = model.LabelValue(*inst.PublicIpAddress) | ||
| } | ||
| labels[ec2LabelPrivateIP] = model.LabelValue(*inst.PrivateIpAddress) | ||
| addr := fmt.Sprintf("%s:%d", *inst.PrivateIpAddress, ed.port) | ||
| labels[model.AddressLabel] = model.LabelValue(addr) | ||
| for _, t := range inst.Tags { | ||
| name := strutil.SanitizeLabelName(*t.Key) | ||
| labels[ec2LabelTag+model.LabelName(name)] = model.LabelValue(*t.Value) | ||
| } | ||
| tg.Targets = append(tg.Targets, labels) | ||
| } | ||
| } | ||
| return true | ||
| }); err != nil { | ||
| return nil, fmt.Errorf("could not describe instances: %s", err) | ||
| } | ||
| return tg, nil | ||
| } |
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