Index out of range, When selecting the EngineOpenGL

[rodolfoaguiar]

Hi, I made a app to receive data from internet (on the flutter side) and persist on the SQLite (using the JSONMessageCodec and the pluginReceiver) but I'm receiving this error sometimes when the memory usage exceeds 200mb

panic: runtime error: index out of range
goroutine 17 [running, locked to thread]:
github.com/Drakirus/go-flutter-desktop-embedder/flutter.proxy_make_current(0x6812490, 0x4320870)
/go/src/github.com/Drakirus/go-flutter-desktop-embedder/flutter/flutter_proxy_glfw.go:43 +0xd2
github.com/Drakirus/go-flutter-desktop-embedder/flutter._cgoexpwrap_e5bc8fd1c1b7_proxy_make_current(0x6812490, 0x23ff7e00)
_cgo_gotypes.go:376 +0x2b

Am I doing something wrong?

Thanks.

[pchampio]

No, you are not doing something wrong, it's an embedder crash.
Can you change this Line to return C.bool(flutterEngines[0].FMakeCurrent(v)), and see if the error still occurs?

Also, "when the memory usage exceeds 200mb", you are speaking of the embedder's memory usage? (or SQLite, ..?)

Thanks for the feedback!

[rodolfoaguiar]

Thanks for your help.

I changed the code but now I have the same error on the 57 line
return C.bool(flutterEngines[index].FPresent(v))

I tried to change to index 0 too but the error persist

return C.bool(flutterEngines[0].FPresent(v))

panic: runtime error: index out of range

goroutine 17 [running, locked to thread]:
github.com/Drakirus/go-flutter-desktop-embedder/flutter.proxy_present(0x6901fa0, 0x43208b0)
/Users/rodolfoaguiar/go/src/github.com/Drakirus/go-flutter-desktop-embedder/flutter/flutter_proxy_glfw.go:57 +0xd2
github.com/Drakirus/go-flutter-desktop-embedder/flutter._cgoexpwrap_a100b3ae5f80_proxy_present(0x6901fa0, 0x69169a0)
_cgo_gotypes.go:402 +0x2b

Any ideias ?

About the memory, I was speaking about the embedder's memory.

Thanks.

[pchampio]

I managed to reproduce the error on linux, I don't thinks it's related to the size of the embedder's memory. I didn't find a setup to reproduce the errors, it's kind of random.

The EngineOpenGL is stored globally at the moment.
This error might come from the Golang Memory management.

[rodolfoaguiar]

Thanks for your help

[GeertJohan]

@rodolfoaguiar Can you please try if this problem still occurs with the most recent version of this package? Make sure to update both the go-getted package (go get -u -a github.com/Drakirus/go-flutter-desktop-embedder) and any sources you have manually cloned.

If this problem still occurs, can you share a standalone project that reproduces the issue, so I may try to debug this.

[GeertJohan]

Without more information it's hard for us to reproduce the described behaviour. Also, a lot has changed in the way engine lookups work, and some bugs that may have caused this error were fixed. Please open a new issue if the problem still occurs with the latest version of go-flutter.