golang show scedulled events for EC2 instances

ec2_events.go

// thanks to https://github.com/rhartkopf/check_ec2_events/blob/master/check_ec2_events.go
// This program will query Amazon API
// and show scedulled events for EC2 instances
// When you have a slack, you would like to see messages in the room:
// 0 6 * * * root  /usr/local/bin/instances_event | /usr/local/bin/slacktee.sh  --title "upcoming instances events" > /dev/null

package main

import (
	"fmt"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/ec2"
)

func connectToAWS() *ec2.EC2 {
	screds := credentials.NewSharedCredentials("/root/.aws/credentials", "default")
	config := aws.Config{Region: aws.String("us-east-1"), Credentials: screds}
	sess := session.New(&config)
	if sess == nil {
		fmt.Println("problems")
	}
	svc := ec2.New(sess)
	return svc
}

func main() {
	svc := connectToAWS()
	var params *ec2.DescribeInstanceStatusInput

	resp, err := svc.DescribeInstanceStatus(params)
	if err != nil {
		fmt.Println("Unable to DescribeInstanceStatus", err)
	}

	for item := range resp.InstanceStatuses {
		instance_id := *resp.InstanceStatuses[item].InstanceId
		for _, event := range resp.InstanceStatuses[item].Events {
			switch code := event.Code; *code {
			case "instance-reboot":
				fmt.Println("WARNING - instance", instance_id, "will be rebooted at", event.NotBefore, "- Description:", *event.Description)

			case "system-reboot":
				fmt.Println("WARNING - physical host will be rebooted at", event.NotBefore, "- Description:", *event.Description)

			case "system-maintenance":
				fmt.Println("WARNING - physical host maintenance will be performed at", event.NotBefore, "- Description:", *event.Description)

			case "instance-retirement", "instance-stop":
				fmt.Println("CRITICAL - instance", instance_id, "will be retired at", event.NotBefore, "- Description:", *event.Description)

			default:
				fmt.Println("CRITICAL - unknown event type", *event.Code, "scheduled for", event.NotBefore, "- Description:", *event.Description)
			}
		}
	}
}