Memory Leak on View Render with Encodable Struct/Enum

[David Schwartz]

Describe the bug

When decoding both Encodable structs and enums as a context object for a view render, I have found that there appears to be a small memory leak. The memory leak mostly vanishes when the route returns a View containing a ByteBuffer from a string, describing the struct, in that way ensuring everything else but the final render is compiled in. It does seem like there's still a tiny memory leak though, so it may be that the leak's still there, just significantly minimized.

To Reproduce

1. Create a template project
2. (to speed up the leak) Create a struct, and apply the struct to the template as a context object
3. Stress test it with curl in an infinite while loop

Expected behavior

Memory stays mostly consistent within a normal range for the workload

Environment

This is all being run on Linux. Here's a copy of framework versions

• Vapor Framework version: 4.65.1
• Vapor Toolbox version: ...
• OS version: Ubuntu 22.04.1 LTS

Additional context

This is completely consistent. I'd love some insight into what's going on here. This project is for a business, so I'll have to write some nasty workarounds if I can't figure this out. Best avoided, obviously.

[David Schwartz]

found a reference cycle. I'll send in a PR in a bit.

[David Schwartz]

PR: #216