Add README and new elb-name tool

README.md

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+# AWS tools
+
+Some specialised tools to avoid pulling boto3
+
+* `elb`: ELB classic only (no ALB). Given a name returns the zone53 record associated with the ELB, including scheme (https returned if both available) and port.
+* `elb-name`: Both ELB classic and ALB. Given a name, returns route53 record associated with the ELB. Does not include scheme or port as it doesn't check listeners.
+* `s3-download`: Download a single file from s3
+* `ec2-ip-from-name`: Given an EC2 name, list up to `-max-results` IPs associated with instances with that name (default is 1).
+* `ecs`: Run a task definition

elb-name/main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/elbv2"
+	"github.com/aws/aws-sdk-go/service/route53"
+)
+
+func main() {
+
+	loadBalancerName := flag.String("name", "", "Name of the load balancer")
+	region := flag.String("region", "eu-west-1", "AWS region")
+	flag.Parse()
+
+	if len(*loadBalancerName) < 1 {
+		fmt.Println("Missing load balancer name")
+		os.Exit(1)
+	}
+
+	config := aws.Config{Region: aws.String(*region)}
+	session := session.New(&config)
+
+	elb_svc := elbv2.New(session)
+	params := &elbv2.DescribeLoadBalancersInput{
+		Names: []*string{aws.String(*loadBalancerName)},
+	}
+	resp, err := elb_svc.DescribeLoadBalancers(params)
+
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(3)
+	}
+
+	l := len(resp.LoadBalancers)
+	if l < 0 {
+		fmt.Println("No load balancer found")
+		os.Exit(2)
+	}
+
+	dnsName := *resp.LoadBalancers[0].DNSName
+	dnsNameDot := fmt.Sprintf("%s.", dnsName)
+	route53_svc := route53.New(session)
+
+	zones, err := route53_svc.ListHostedZones(&route53.ListHostedZonesInput{})
+
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(3)
+	}
+	for _, hostedZone := range zones.HostedZones {
+		zoneId := hostedZone.Id
+
+		records, err := route53_svc.ListResourceRecordSets(&route53.ListResourceRecordSetsInput{HostedZoneId: zoneId})
+		if err != nil {
+			fmt.Println(err.Error())
+			break
+		}
+		for _, record := range records.ResourceRecordSets {
+			if record.AliasTarget == nil || record.AliasTarget.DNSName == nil {
+				continue
+			}
+			if *record.AliasTarget.DNSName == dnsNameDot {
+				dnsName = strings.TrimRight(*record.Name, ".")
+				break
+			}
+
+		}
+	}
+	fmt.Println(dnsName)
+}