I have a specific use case where a user’s data sources are conditional - e.g based on the data sources saved in the database for every specific user.
This also means every data source has unique credentials for every user, which is fine for RESTDataSource because I can use the willSendRequest to set the Authentication headers before each request.
However, I have custom data sources that have proprietary clients (for example JSForce for Salesforce) - and they have their own fetch mechanism.
As of now - I have a custom transformer directive that fetches the tokens from the database and adds it into the context - however, the directive is ran before the dataSource.initialize() method - so that I can’t use the credentials there because the context still doesn’t have it.
I also don’t want to initialize all data sources for every user even if he doesn’t use said data source in this request - but the dataSources() function doesn’t accept any parameter and is not contextual.
Bottom line is - is it possible to pass data sources conditionally based even on the Express request? When is the right time to pass the tokens and credentials to the dataSource? Maybe add my own custom init function and call it from the directive?