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package config
import (
"context"
"os"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/ec2/imds"
)
const execEnvVar = "AWS_EXECUTION_ENV"
// DefaultsModeOptions is the set of options that are used to configure
type DefaultsModeOptions struct {
// The SDK configuration defaults mode. Defaults to legacy if not specified.
//
// Supported modes are: auto, cross-region, in-region, legacy, mobile, standard
Mode aws.DefaultsMode
// The EC2 Instance Metadata Client that should be used when performing environment
// discovery when aws.DefaultsModeAuto is set.
//
// If not specified the SDK will construct a client if the instance metadata service has not been disabled by
// the AWS_EC2_METADATA_DISABLED environment variable.
IMDSClient *imds.Client
}
func resolveDefaultsModeRuntimeEnvironment(ctx context.Context, envConfig *EnvConfig, client *imds.Client) (aws.RuntimeEnvironment, error) {
getRegionOutput, err := client.GetRegion(ctx, &imds.GetRegionInput{})
// honor context timeouts, but if we couldn't talk to IMDS don't fail runtime environment introspection.
select {
case <-ctx.Done():
return aws.RuntimeEnvironment{}, err
default:
}
var imdsRegion string
if err == nil {
imdsRegion = getRegionOutput.Region
}
return aws.RuntimeEnvironment{
EnvironmentIdentifier: aws.ExecutionEnvironmentID(os.Getenv(execEnvVar)),
Region: envConfig.Region,
EC2InstanceMetadataRegion: imdsRegion,
}, nil
}
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