mirror of https://github.com/status-im/consul.git
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package agent
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import (
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"log"
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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/defaults"
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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/aws/aws-sdk-go/service/ec2"
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)
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// discoverEc2Hosts searches an AWS region, returning a list of instance ips
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// where EC2TagKey = EC2TagValue
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func (c *Config) discoverEc2Hosts(logger *log.Logger) ([]string, error) {
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config := c.RetryJoinEC2
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ec2meta := ec2metadata.New(session.New())
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if config.Region == "" {
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logger.Printf("[INFO] agent: No EC2 region provided, querying instance metadata endpoint...")
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identity, err := ec2meta.GetInstanceIdentityDocument()
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if err != nil {
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return nil, err
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}
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config.Region = identity.Region
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}
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awsConfig := &aws.Config{
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Region: &config.Region,
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Credentials: credentials.NewChainCredentials(
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[]credentials.Provider{
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&credentials.StaticProvider{
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Value: credentials.Value{
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AccessKeyID: config.AccessKeyID,
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SecretAccessKey: config.SecretAccessKey,
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},
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},
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&credentials.EnvProvider{},
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&credentials.SharedCredentialsProvider{},
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defaults.RemoteCredProvider(*(defaults.Config()), defaults.Handlers()),
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}),
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}
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svc := ec2.New(session.New(), awsConfig)
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resp, err := svc.DescribeInstances(&ec2.DescribeInstancesInput{
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Filters: []*ec2.Filter{
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{
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Name: aws.String("tag:" + config.TagKey),
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Values: []*string{
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aws.String(config.TagValue),
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},
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},
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},
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})
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if err != nil {
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return nil, err
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}
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var servers []string
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for i := range resp.Reservations {
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for _, instance := range resp.Reservations[i].Instances {
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// Terminated instances don't have the PrivateIpAddress field
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if instance.PrivateIpAddress != nil {
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servers = append(servers, *instance.PrivateIpAddress)
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}
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}
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}
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return servers, nil
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}
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