Live Update: collection proxy fails to load if missing resources are loaded in wrong order

[aglitchman]

Describe the bug (REQUIRED)
We use Live Update to load extra content in our HTML5 games. What we usually do, the steps:

• Download .zip archive generated by Live Update.
• Call collectionproxy.missing_resources to get the missing resources array.
• Iterate the array and call resource.store_resource to load the missing resources one by one from the zip file.
• Load and enable the proxy.

What's wrong? Sometimes Defold fails to load the proxy. The errors are different each time: IO_ERROR or FORMAT_ERROR, i.e. there are no specific problem.

To Reproduce (REQUIRED)
Load the missing resources by calling resource.store_resource one by one in the random order to get the error sometimes. It should be done in the way of fuzz testing, I think.

Expected behavior (REQUIRED)
If we should load the missing resources in the particular order then it should be stated in the docs and the collectionproxy.missing_resources function should return the list of the missing resources in that order.

OR

Defold should be able to load (store) resources in any order.

Defold version (REQUIRED):

• Version: 1.4.1 and many versions before.

Platforms (REQUIRED):

• Platforms: HTML5. I didn't test other platforms.

Workaround (OPTIONAL):
Shuffle the missing resources array to store the resources in the different order! It sounds strange but it works.

Plus, this issue is the reason why I implemented this code that cleans the Live Update cache before the start of the game. Otherwise, we were getting random errors that were hard to understand and it was impossible to make a repro case.

[britzl]

Strange. And you're sure you are storing the correct data for each missing resource?

[aglitchman]

This issue is related to the legacy LiveUpdate API. The issue was fixed in Defold 1.5.0 just because of the introduction of new API.