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lazyssm.go
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/
lazyssm.go
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package elephantine
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/ssm"
)
// NewLazySSM creates a new SSM ParameterSource.
func NewLazySSM() *LazySSM {
return &LazySSM{}
}
// NewLazySSM is a SSM-backed ParameterSource implementation for
// ResolveParameter().
type LazySSM struct {
ssm *ssm.Client
}
// GetParameterValue implements ParameterSource.
func (l *LazySSM) GetParameterValue(ctx context.Context, name string) (string, error) {
if l.ssm == nil {
cfg, err := config.LoadDefaultConfig(ctx)
if err != nil {
return "", fmt.Errorf("failed to load AWS SDK config: %w", err)
}
l.ssm = ssm.NewFromConfig(cfg)
}
param, err := l.ssm.GetParameter(ctx, &ssm.GetParameterInput{
Name: aws.String(name),
WithDecryption: aws.Bool(true),
})
if err != nil {
return "", fmt.Errorf("error response from AWS SSM: %w", err)
}
return *param.Parameter.Value, nil
}