[ftr/asyncInstance] fix error thrown for undefined provider instances#22689
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spalger merged 1 commit intoelastic:masterfrom Sep 4, 2018
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…elastic#22689) When a FTR service is created async the promise created by its provider is wrapped in a [`Proxy`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Proxy) that checks before each property access if the instance has finished initializing. This breaks if the service provider returns undefined, which is the case for the `failureDebugging` service, because our truthy check will fail and we throw the error claiming the service is uninitialized, which is probably incorrect. This PR updates the proxy to use a `Symbol` to indicate when a service instance is not available yet and throws a different error when the proxy receives any request (get, set, etc.) and the service instance is not an object, as required by the Reflect APIs.
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When a FTR service is created async the promise created by its provider is wrapped in a
Proxythat checks before each property access if the instance has finished initializing. This breaks if the service provider returns undefined, which is the case for thefailureDebuggingservice, because our truthy check will fail and we throw the error claiming the service is uninitialized, which is probably incorrect.This PR updates the proxy to use a
Symbolto indicate when a service instance is not available yet and throws a different error when the proxy receives any request (get, set, etc.) and the service instance is not an object, as required by the Reflect APIs.