## Enhancements

### Adding a Second Instance of an Adapter

You can add a second instance of this adapter without adding new code on the file system. To do this go into the IAP Admin Essentials and add a new service config for this adapter. The two instances of the adapter should have unique ids. In addition, they should point to different instances (unique host and port) of the other system.

### Adding Adapter Calls

There are multiple ways to add calls to an existing adapter.

The easiest way would be to use the Adapter Builder update process. This process takes in a Swagger or OpenAPI document, allows you to select the calls you want to add and then generates a zip file that can be used to update the adapter. Once you have the zip file simply put it in the adapter directory and execute `npm run adapter:update`.

```bash
mv updatePackage.zip adapter-gcp_compute
cd adapter-gcp_compute
npm run adapter:update
```

If you do not have a Swagger or OpenAPI document, you can use a Postman Collection and convert that to an OpenAPI document using APIMatic and then follow the first process.

If you want to manually update the adapter that can also be done the key thing is to make sure you update all of the right files. Within the entities directory you will find 1 or more entities. You can create a new entity or add to an existing entity. Each entity has an action.json file, any new call will need to be put in the action.json file. It will also need to be added to the enum for the ph_request_type in the appropriate schema files. Once this configuration is complete you will need to add the call to the adapter.js file and, in order to make it available as a workflow task in IAP, it should also be added to the pronghorn.json file. You can optionally add it to the unit and integration test files. There is more information on how to work on each of these files in the <a href="https://docs.itential.com/opensource/docs/adapters" target="_blank">Adapter Technical Resources</a> on our Documentation Site.

```text
Files to update
* entities/<entity>/action.json: add an action
* entities/<entity>/schema.json (or the schema defined on the action): add action to the enum for ph_request_type
* adapter.js: add the new method and make sure it calls the proper entity and action
* pronghorn.json: add the new method
* test/unit/adapterTestUnit.js (optional but best practice): add unit test(s) - function is there, any required parameters error when not passed in
* test/integration/adapterTestIntegration.js (optional but best practice): add integration test
```

### Adding Adapter Properties

While changing adapter properties is done in the service instance configuration section of IAP, adding properties has to be done in the adapter. To add a property you should edit the propertiesSchema.json with the proper information for the property. In addition, you should modify the sampleProperties to have the new property in it.

```text
Files to update
* propertiesSchema.json: add the new property and how it is defined
* sampleProperties: add the new property with a default value
* test/unit/adapterTestUnit.js (optional but best practice): add the property to the global properties
* test/integration/adapterTestIntegration.js (optional but best practice): add the property to the global properties
```

### Changing Adapter Authentication

Often an adapter is built before knowing the authentication and authentication processes can also change over time. The adapter supports many different kinds of authentication but it does require configuration. Some forms of authentication can be defined entirely with the adapter properties but others require configuration.

```text
Files to update
* entities/.system/action.json: change the getToken action as needed
* entities/.system/schemaTokenReq.json: add input parameters (external name is name in other system)
* entities/.system/schemaTokenResp.json: add response parameters (external name is name in other system)
* propertiesSchema.json: add any new property and how it is defined
* sampleProperties: add any new property with a default value
* test/unit/adapterTestUnit.js (optional but best practice): add the property to the global properties
* test/integration/adapterTestIntegration.js (optional but best practice): add the property to the global properties
```

### Enhancing Adapter Integration Tests

The adapter integration tests are written to be able to test in either stub (standalone) mode or integrated to the other system. However, if integrating to the other system, you may need to provide better data than what the adapter provides by default as that data is likely to fail for create and update. To provide better data, edit the adapter integration test file. Make sure you do not remove the marker and keep custom code below the marker so you do not impact future migrations. Once the edits are complete, run the integration test as it instructs you to above. When you run integrated to the other system, you can also save mockdata for future use by changing the isSaveMockData flag to true.

```text
Files to update
* test/integration/adapterTestIntegration.js: add better data for the create and update calls so that they will not fail.
```

As mentioned previously, for most of these changes as well as other possible changes, there is more information on how to work on an adapter in the <a href="https://docs.itential.com/opensource/docs/adapters" target="_blank">Adapter Technical Resources</a> on our Documentation Site.
