can whitelist stages to start dynamodb local

Author: Calle Kabo

README.md

@@ -67,6 +67,9 @@ custom:
       seed: true
     # Uncomment only if you already have a DynamoDB running locally
     # noStart: true
+    # If you only want to start DynamoDB in some stages, declare them here
+      stages:
+        - dev
 ```
 
 ##  Migrations: sls dynamodb migrate

index.js

@@ -182,9 +182,16 @@ class ServerlessDynamodbLocal {
             this.options
         );
 
+        const stage = options.stage || this.serverless.service.provider.stage
+        let startThisStage = true;
+        if (options.stages && !options.stages.includes(stage)) {
+          startThisStage = false;
+        }
+        options.startThisStage = startThisStage
+
         // otherwise endHandler will be mis-informed
         this.options = options;
-        if (!options.noStart) {
+        if (!options.noStart && startThisStage) {
           dynamodbLocal.start(options);
         }
         return BbPromise.resolve()
@@ -193,7 +200,7 @@ class ServerlessDynamodbLocal {
     }
 
     endHandler() {
-        if (!this.options.noStart) {
+        if (!this.options.noStart && this.options.startThisStage) {
             this.serverlessLog("DynamoDB - stopping local database");
             dynamodbLocal.stop(this.port);
         }