Expose services using a LoadBalancer

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

ecs/cmd/main/main.go

@@ -76,10 +76,10 @@ func ComposeCommand(clusteropts *clusterOptions) *cobra.Command {
 	return cmd
 }
 
-func UpCommand(clusteropts *clusterOptions, opts *compose.ProjectOptions) *cobra.Command {
+func UpCommand(clusteropts *clusterOptions, projectOpts *compose.ProjectOptions) *cobra.Command {
 	cmd := &cobra.Command{
 		Use: "up",
-		RunE: compose.WithProject(opts, func(project *compose.Project, args []string) error {
+		RunE: compose.WithProject(projectOpts, func(project *compose.Project, args []string) error {
 			client, err := amazon.NewClient(clusteropts.profile, clusteropts.cluster, clusteropts.region)
 			if err != nil {
 				return err

ecs/pkg/amazon/client.go

@@ -6,6 +6,7 @@ import (
 	"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/aws/aws-sdk-go/service/ecs"
+	"github.com/aws/aws-sdk-go/service/elbv2"
 	"github.com/aws/aws-sdk-go/service/iam"
 	"github.com/docker/ecs-plugin/pkg/compose"
 )
@@ -31,6 +32,7 @@ func NewClient(profile string, cluster string, region string) (compose.API, erro
 		sess: sess,
 		ECS: ecs.New(sess),
 		EC2:  ec2.New(sess),
+		ELB: elbv2.New(sess),
 		CW: cloudwatchlogs.New(sess),
 		IAM: iam.New(sess),
 	}, nil
@@ -42,6 +44,7 @@ type client struct {
 	sess *session.Session
 	ECS *ecs.ECS
 	EC2 *ec2.EC2
+	ELB     *elbv2.ELBV2
 	CW *cloudwatchlogs.CloudWatchLogs
 	IAM *iam.IAM
 }

ecs/pkg/amazon/down.go

@@ -9,6 +9,11 @@ import (
 )
 
 func (c *client) ComposeDown(project *compose.Project) error {
+	err := c.DeleteLoadBalancer(project)
+	if err != nil {
+		return err
+	}
+
 	services := []*string{}
 	// FIXME we should be able to retrieve services by tags, so we don't need the initial compose file to run "down"
 	for _, service := range project.Services {
@@ -23,18 +28,17 @@ func (c *client) ComposeDown(project *compose.Project) error {
 		if err != nil {
 			return err
 		}
-
-		logrus.Debugf("Service deleted %q\n", *out.Service.ServiceName)
-		services = append(services, out.Service.ServiceName)
+		services = append(services, out.Service.ServiceArn)
 	}
-	logrus.Info("All services stopped")
 
-	err := c.ECS.WaitUntilServicesInactive(&ecs.DescribeServicesInput{
+	logrus.Info("Stopping services...")
+	err = c.ECS.WaitUntilServicesInactive(&ecs.DescribeServicesInput{
 		Services: services,
 	})
 	if err != nil {
 		return err
 	}
+	logrus.Info("All services stopped")
 
 	logrus.Debug("Deleting security groups")
 	groups, err := c.EC2.DescribeSecurityGroups(&ec2.DescribeSecurityGroupsInput{

ecs/pkg/amazon/loadBalancer.go

@@ -0,0 +1,133 @@
+package amazon
+
+import (
+	"fmt"
+	"github.com/docker/ecs-plugin/pkg/compose"
+	"github.com/sirupsen/logrus"
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/elbv2"
+	"github.com/compose-spec/compose-go/types"
+)
+
+func (c client) CreateLoadBalancer(project *compose.Project, subnets []*string) (*string, error) {
+	logrus.Debug("Create Load Balancer")
+	alb, err := c.ELB.CreateLoadBalancer(&elbv2.CreateLoadBalancerInput{
+		IpAddressType: nil,
+		Name:          aws.String(fmt.Sprintf("%s-LoadBalancer", project.Name)),
+		Subnets:       subnets,
+		Type:          aws.String(elbv2.LoadBalancerTypeEnumNetwork),
+		Tags: []*elbv2.Tag{
+			{
+				Key:   aws.String("com.docker.compose.project"),
+				Value: aws.String(project.Name),
+			},
+		},
+	})
+	if err != nil {
+		return nil, err
+	}
+	return alb.LoadBalancers[0].LoadBalancerArn, nil
+}
+
+func (c client) DeleteLoadBalancer(project *compose.Project) error {
+	logrus.Debug("Delete Load Balancer")
+	// FIXME We can tag LoadBalancer but not search by tag ?
+	loadBalancer, err := c.ELB.DescribeLoadBalancers(&elbv2.DescribeLoadBalancersInput{
+		Names: aws.StringSlice([]string{fmt.Sprintf("%s-LoadBalancer", project.Name)}),
+	})
+	if err != nil {
+		return err
+	}
+	arn := loadBalancer.LoadBalancers[0].LoadBalancerArn
+
+	err = c.DeleteListeners(arn)
+	if err != nil {
+		return err
+	}
+
+	err = c.DeleteTargetGroups(arn)
+	if err != nil {
+		return err
+	}
+
+	_, err = c.ELB.DeleteLoadBalancer(&elbv2.DeleteLoadBalancerInput{LoadBalancerArn: arn})
+	return err
+}
+
+func (c client) CreateTargetGroup(name string, vpc *string, port types.ServicePortConfig) (*string, error) {
+	logrus.Debugf("Create Target Group %d/%s\n", port.Target, port.Protocol)
+	group, err := c.ELB.CreateTargetGroup(&elbv2.CreateTargetGroupInput{
+		Name:       aws.String(name),
+		Port:       aws.Int64(int64(port.Target)),
+		Protocol:   aws.String(strings.ToUpper(port.Protocol)),
+		TargetType: aws.String("ip"),
+		VpcId:      vpc,
+	})
+	if err != nil {
+		return nil, err
+	}
+	arn := group.TargetGroups[0].TargetGroupArn
+	return arn, nil
+}
+
+func (c client) DeleteTargetGroups(loadBalancer *string) error {
+	groups, err := c.ELB.DescribeTargetGroups(&elbv2.DescribeTargetGroupsInput{
+		LoadBalancerArn: loadBalancer,
+	})
+	if err != nil {
+		return err
+	}
+	for _, group := range groups.TargetGroups {
+		logrus.Debugf("Delete Target Group %s\n", *group.TargetGroupArn)
+		_, err := c.ELB.DeleteTargetGroup(&elbv2.DeleteTargetGroupInput{
+			TargetGroupArn: group.TargetGroupArn,
+		})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c client) CreateListener(port types.ServicePortConfig, arn *string, target *string) error {
+	logrus.Debugf("Create Listener %d\n", port.Published)
+	_, err := c.ELB.CreateListener(&elbv2.CreateListenerInput{
+		DefaultActions: []*elbv2.Action{
+			{
+				ForwardConfig: &elbv2.ForwardActionConfig{
+					TargetGroups: []*elbv2.TargetGroupTuple{
+						{
+							TargetGroupArn: target,
+						},
+					},
+				},
+				Type: aws.String(elbv2.ActionTypeEnumForward),
+			},
+		},
+		LoadBalancerArn: arn,
+		Port:            aws.Int64(int64(port.Published)),
+		Protocol:        aws.String(strings.ToUpper(port.Protocol)),
+	})
+	return err
+}
+
+func (c client) DeleteListeners(loadBalancer *string) error {
+	listeners, err := c.ELB.DescribeListeners(&elbv2.DescribeListenersInput{
+		LoadBalancerArn: loadBalancer,
+	})
+	if err != nil {
+		return err
+	}
+	for _, listener := range listeners.Listeners {
+		logrus.Debugf("Delete Listener %s\n", *listener.ListenerArn)
+		_, err := c.ELB.DeleteListener(&elbv2.DeleteListenerInput{
+			ListenerArn: listener.ListenerArn,
+		})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

ecs/pkg/amazon/up.go

@@ -1,6 +1,7 @@
 package amazon
 
 import (
+	"fmt"
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/ecs"
 	"github.com/compose-spec/compose-go/types"
@@ -40,13 +41,37 @@ func (c *client) ComposeUp(project *compose.Project) error {
 		return err
 	}
 
+	loadBalancer, err := c.CreateLoadBalancer(project, subnets)
+	if err != nil {
+		return err
+	}
+
 	logGroup, err := c.GetOrCreateLogGroup(project)
 	if err != nil {
 		return err
 	}
 
 	for _, mapping := range mappings {
-		_, err = c.CreateService(project, mapping.service, mapping.task, securityGroup, subnets, logGroup)
+		ingress := []*ecs.LoadBalancer{}
+		for _, port := range mapping.service.Ports {
+			name := fmt.Sprintf("%s-%s-%d-%s", project.Name, mapping.service.Name, port.Target, port.Protocol)
+			targetgroup, err := c.CreateTargetGroup(name, vpc, port)
+			if err != nil {
+				return err
+			}
+			ingress = append(ingress, &ecs.LoadBalancer{
+				ContainerName:  aws.String(mapping.service.Name),
+				ContainerPort:  aws.Int64(int64(port.Target)),
+				TargetGroupArn: targetgroup,
+			})
+
+			err = c.CreateListener(port, loadBalancer, targetgroup)
+			if err != nil {
+				return err
+			}
+		}
+
+		_, err = c.CreateService(project, mapping.service, mapping.task, securityGroup, subnets, logGroup, ingress)
 		if err != nil {
 			return err
 		}
@@ -54,7 +79,7 @@ func (c *client) ComposeUp(project *compose.Project) error {
 	return nil
 }
 
-func (c *client) CreateService(project *compose.Project, service *types.ServiceConfig, task *ecs.RegisterTaskDefinitionInput, securityGroup *string, subnets []*string, logGroup *string) (*string, error) {
+func (c *client) CreateService(project *compose.Project, service *types.ServiceConfig, task *ecs.RegisterTaskDefinitionInput, securityGroup *string, subnets []*string, logGroup *string, ingress []*ecs.LoadBalancer) (*string, error) {
 	role, err := c.GetEcsTaskExecutionRole(service)
 	if err != nil {
 		return nil, err
@@ -88,6 +113,7 @@ func (c *client) CreateService(project *compose.Project, service *types.ServiceC
 		ServiceName:        aws.String(service.Name),
 		SchedulingStrategy: aws.String(ecs.SchedulingStrategyReplica),
 		TaskDefinition:     arn,
+		LoadBalancers: ingress,
 	})
 
 	for _, port := range service.Ports {