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aws.go
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aws.go
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package agent
import (
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/buildkite/agent/logger"
)
var awsSess *session.Session
// The aws sdk relies on being given a region, which is a breaking change for us
// This applies a heuristic that detects where the agent might be based on the env
// but also the local isntance metadata if available
func awsRegion() (string, error) {
if r := os.Getenv("AWS_REGION"); r != "" {
return r, nil
}
if r := os.Getenv("AWS_DEFAULT_REGION"); r != "" {
return r, nil
}
// The metadata service seems to want a session
sess, err := session.NewSession(&aws.Config{
Region: aws.String("us-east-1"),
})
if err != nil {
return "", err
}
meta := ec2metadata.New(sess)
if meta.Available() {
region, err := meta.Region()
if err == nil {
logger.Debug("Detected AWS region %s", region)
}
return region, err
}
return "", aws.ErrMissingRegion
}
func awsSession() (*session.Session, error) {
region, err := awsRegion()
if err != nil {
return nil, err
}
if awsSess == nil {
awsSess, err = session.NewSession(&aws.Config{
Region: aws.String(region),
})
if err != nil {
return nil, err
}
}
return awsSess, nil
}