func GetAWSConfigSession()

in pkg/conn/conn.go [150:193]
42 lines of code
8 McCabe index (conditional complexity)

func GetAWSConfigSession(cn connAttr, c *cfg.Config, roleArn string, region string, noMetadata bool) (*aws.Config, *session.Session) {
	var s *session.Session
	var err error
	var awsRegion string
	http := getNewHTTPClient(cfg.ParameterConfigValue.Processor.MaxIdleConnPerHost, cfg.ParameterConfigValue.Processor.RequestTimeout, *c.NoVerifySSL, c.ProxyAddress)
	regionEnv := os.Getenv("AWS_REGION")
	if region == "" && regionEnv != "" {
		awsRegion = regionEnv
		log.Debugf("Fetch region %v from environment variables", awsRegion)
	} else if region != "" {
		awsRegion = region
		log.Debugf("Fetch region %v from commandline/config file", awsRegion)
	} else if !noMetadata {
		awsRegion = getRegionFromECSMetadata()
		if awsRegion == "" {
			es := getDefaultSession()
			awsRegion, err = cn.getEC2Region(es)
			if err != nil {
				log.Errorf("Unable to fetch region from EC2 metadata: %v\n", err)
			} else {
				log.Debugf("Fetch region %v from ec2 metadata", awsRegion)
			}
		}
	} else {
		es := getDefaultSession()
		awsRegion = *es.Config.Region
		log.Debugf("Fetched region %v from session config", awsRegion)

	}
	if awsRegion == "" {
		log.Errorf("Cannot fetch region variable from config file, environment variables, ecs metadata, or ec2 metadata. Use local-mode to use the local session region.")
		os.Exit(1)
	}
	s = cn.newAWSSession(roleArn, awsRegion)

	config := &aws.Config{
		Region:                 aws.String(awsRegion),
		DisableParamValidation: aws.Bool(true),
		MaxRetries:             aws.Int(2),
		Endpoint:               aws.String(c.Endpoint),
		HTTPClient:             http,
	}
	return config, s
}