If application version already exists, use it

Author: alexjurkiewicz

lib/dpl/providers/elasticbeanstalk.rb

@@ -44,6 +44,7 @@ class Elasticbeanstalk < Provider
            zip_add: 'Adding %s'
 
       msgs clean_description: 'Removed non-printable characters from the version description'
+           app_ver_exists: 'Application version already exists, skipping upload and using existing version'
 
       attr_reader :started, :object, :version
 
@@ -109,16 +110,28 @@ def upload
       end
 
       def create_version
-        @version = eb.create_application_version(
-          application_name: app,
-          version_label: label,
-          description: clean(description[0, 200]),
-          source_bundle: {
-            s3_bucket: bucket.name,
-            s3_key: object.key
-          },
-          auto_create_application: false
-        )
+        begin
+          @version = eb.create_application_version(
+            application_name: app,
+            version_label: label,
+            description: clean(description[0, 200]),
+            source_bundle: {
+              s3_bucket: bucket.name,
+              s3_key: object.key
+            },
+            auto_create_application: false
+          )
+        rescue rescue Aws::ElasticBeanstalk::Errors::ServiceError => e
+          raise e unless e.message.match?(/^Application Version [^ ]+ already exists.$/)
+          info :app_ver_exists
+          ver = eb.describe_application_versions({
+            application_name: app,
+            version_labels: [label],
+          }).application_versions[0]
+          @version = { application_version: ver }
+        end
+
+
       end
 
       def update_app