gateio: fix futures subscription generation

[shazbert]

PR Description

Fixes issue [ERROR] | WEBSOCKET | 22/11/2024 08:56:38 | GateIO websocket: subscription failure, currency pairs is empty

Thanks @gbjk for bringing this up.

Type of change

Please delete options that are not relevant and add an x in [] as item is complete.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How has this been tested

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration and
also consider improving test coverage whilst working on a certain feature or package.

• go test ./... -race
• golangci-lint run
• Test X

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation and regenerated documentation via the documentation tool
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally and on Github Actions with my changes
• Any dependent changes have been merged and published in downstream modules

[gbjk]

Good work 👏
Just a few minor things.

[gloriousCode]

Hello, what actually caused the issue so that I may replicate/verify that things are fixed?
edit:
Replication Steps:

1. Disable all GateIO assets except futures
2. Only have BTC-USD as the enabled pair
3. Run GCT

[gloriousCode]

tACK! Thank you!

It does show the following output now that things are fixed though. I kinda dislike the output and I'll think about how to whinge about this in future 🌈

if verbose
log.Warnf(log.WebsocketMgr, "%s websocket: no subscriptions generated", w.exchangeName)

[thrasher-]

Both:

just BTC-USD enabled:

tACK, thanks @gbjk for reporting this!