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Ashok Menon 89d72c99be BREAKING - (Re)moving JSBundleLoader.getSourceUrl()

Summary:
== What ==

Changing the `JSBundleLoader` API, to remove `String getSourceUrl()`, instead `JSBundleLoader.loadScript` now returns the source URL it loaded.

This change has a knock-on effect: We can no longer populate `SourceCodeModule` when we construct it, because at that time, we do not know the source URL.

In order to solve this I have made the following changes:

- Added `CatalystInstance.getSourceURL()`, to return the source URL from the instance after the JS Bundle has been loaded, or `null` otherwise.
- Removed `ReactInstanceManager.getSourceUrl()`, because its only purpose was to populate `SourceCodeModule`.
- Also removed `ReactInstanceManager.getJSBundleFile()` because it was only being used in a test confirming that the `ReactInstanceManager` knew its bundle file as soon as it was constructed, which is no longer necessarily true.
- Initialise `SourceCodeModule` with the `ReactContext` instance it belongs to.
- Override `NativeModule.initialize()` in `SourceCodeModule` to fetch the source URL. When the `SourceCodeModule` is constructed, the context does not have a properly initialised `CatalystInstance`, but by the time we call initialise on it, the `ReactContext` has a `CatalystInstance` and that in turn has a source URL.

== Why ==

The reason for this change is that it allows us to add implementations of `JSBundleLoader`, that cannot determine their source URL until after having performed a load successfully. In particular I plan to introduce `FallbackJSBundleLoader` which will try to load from multiple sources in sequence stopping after the first successful load. As load failures could happen for a variety of reasons, we can't know what the true source URL is without performing the load.

Reviewed By: javache

Differential Revision: D4398956

fbshipit-source-id: 51ff4e289c8723e9d242f23267181c775a6abe6f

2017-01-13 03:58:47 -08:00