Feature/add elb resource suppport

README.md

@@ -66,10 +66,18 @@ custom:
       my-task-with-load-balancers:
         image: 123456789369.dkr.ecr.eu-west-1.amazonaws.com/my-image
         loadBalancers:
-          - port: 8080
-            arn: ${self:custom.httpTargetGroupArn}
-          - port 8443
-            arn: ${self:custom.httpsTargetGroupArn}
+          # You can use the arn of an existing target group already associated with a load balancer
+          - hostPort: 8080
+            containerPort: 8080
+            targetGroup: ${self:custom.httpTargetGroupArn}
+          # If you're using an ELB/target group that you're building in the Resources section of
+          # serverless.yml, you may run into an issue where the elb and default listener rule are
+          # not created prior to the target group/service. In this scenario you can specify the 
+          # logical name of the resource so that the appropriate dependencies can be set.
+          - hostPort: 8443
+            containerPort: 8443
+            targetGroup: ${self:custom.httpsTargetGroupArn} 
+            elbResource: "my-task-elb"
 ```
 
 Advanced usage

lib/index.js

@@ -174,14 +174,21 @@ class ServerlessFargateTasks {
         // Configure Load Balancers if defined.
         if(options.tasks[identifier].hasOwnProperty('loadBalancers')) {
           let loadBalancers = [];
+          let dependsOn = [];
           options.tasks[identifier]['loadBalancers'].forEach(item => {
             const loadBalancer = Object.assign({
               'ContainerName': name,
               'ContainerPort': item.containerPort,
-              'TargetGroupArn': item.arn
+              'TargetGroupArn': item.targetGroup
             });
             loadBalancers.push(loadBalancer);
+            if(item.hasOwnProperty('elbResource')) {
+              dependsOn.push(item.elbResource)
+            }
           });
+          if(dependsOn.length > 0) {
+            service['DependsOn'] = dependsOn;
+          }
           service['Properties']['LoadBalancers'] = loadBalancers;
         }
         template['Resources'][normalizedIdentifier + 'Service'] = service