polemos/mtdaws/mtd.go

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package mtdaws
import (
"fmt"
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"net/netip"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/ec2"
"github.com/aws/aws-sdk-go-v2/service/ec2/types"
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"github.com/google/uuid"
"github.com/thefeli73/polemos/state"
)
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// AWSUpdateService updates a specified service config to match a newly moved instance
func AWSUpdateService(config state.Config, region string, service state.CustomUUID, newInstanceID string) (state.Config) {
awsConfig := NewConfig(region, config.AWS.CredentialsPath)
svc := ec2.NewFromConfig(awsConfig)
instance, err := getInstanceDetailsFromString(svc, newInstanceID)
if err != nil {
fmt.Println("Error getting instance details:\t", err)
return config
}
var publicAddr string
if instance.PublicIpAddress != nil {
publicAddr = aws.ToString(instance.PublicIpAddress)
}
formattedinstance := AwsInstance{
InstanceID: aws.ToString(instance.InstanceId),
Region: region,
PublicIP: publicAddr,
PrivateIP: aws.ToString(instance.PrivateIpAddress),
}
cloudid := GetCloudID(formattedinstance)
serviceip := netip.MustParseAddr(publicAddr)
config.MTD.Services[service] = state.Service{CloudID: cloudid, ServiceIP: serviceip}
return config
}
// isInstanceRunning returns if an instance is running (true=running)
func isInstanceRunning(instance *types.Instance) bool {
return instance.State.Name == types.InstanceStateNameRunning
}
// AWSMoveInstance moves a specified instance to a new availability region
func AWSMoveInstance(config state.Config) (state.Config) {
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// pseudorandom instance from all services for testing
var serviceUUID state.CustomUUID
var instance state.Service
for key, service := range config.MTD.Services {
serviceUUID = key
instance = service
break
}
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fmt.Println("MTD move service:\t", uuid.UUID.String(uuid.UUID(serviceUUID)))
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region, instanceID := DecodeCloudID(instance.CloudID)
awsConfig := NewConfig(region, config.AWS.CredentialsPath)
svc := ec2.NewFromConfig(awsConfig)
realInstance, err := getInstanceDetailsFromString(svc, instanceID)
if err != nil {
fmt.Println("Error getting instance details:\t", err)
return config
}
if !isInstanceRunning(realInstance) {
fmt.Println("Error, Instance is not running!")
return config
}
if instance.AdminDisabled {
fmt.Println("Error, Service is Disabled!")
return config
}
if instance.Inactive {
fmt.Println("Error, Service is Inactive!")
return config
}
imageName, err := createImage(svc, instanceID)
if err != nil {
fmt.Println("Error creating image:\t", err)
return config
}
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fmt.Println("Created image:\t\t", imageName)
err = waitForImageReady(svc, imageName, 5*time.Minute)
if err != nil {
fmt.Println("Error waiting for image to be ready:\t", err)
return config
}
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fmt.Println("Image is ready:\t\t", imageName)
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newInstanceID, err := launchInstance(svc, realInstance, imageName, region)
if err != nil {
fmt.Println("Error launching instance:\t", err)
return config
}
fmt.Println("Launched new instance:\t", newInstanceID)
err = terminateInstance(svc, instanceID)
if err != nil {
fmt.Println("Error terminating instance:\t", err)
return config
}
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fmt.Println("Killed old instance:\t", instanceID)
image, err := describeImage(svc, imageName)
if err != nil {
fmt.Println("Error describing image:\t", err)
return config
}
err = deregisterImage(svc, imageName)
if err != nil {
fmt.Println("Error deregistering image:\t", err)
return config
}
fmt.Println("Deregistered image:\t", imageName)
if len(image.BlockDeviceMappings) > 0 {
snapshotID := aws.ToString(image.BlockDeviceMappings[0].Ebs.SnapshotId)
err = deleteSnapshot(svc, snapshotID)
if err != nil {
fmt.Println("Error deleting snapshot:\t", err)
return config
}
fmt.Println("Deleted snapshot:\t", snapshotID)
}
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AWSUpdateService(config, region, serviceUUID, newInstanceID)
return config
}