Remove torrent dependencies at build time for mobile

[Samyoul]

Tor takes up a massive amount of space even once compiled, mobile doesn't use it, mobile shouldn't have it in its build, it will help in the app stores. Investigate and fix.

[Samyoul]

The only instance of the torrent packages import is in a single file. This makes targeting the package for selective compiling much eaiser.

status-go/protocol/communities/manager.go

Lines 19 to 21 in 03de0a2

	"github.com/anacrolix/torrent"
	"github.com/anacrolix/torrent/bencode"
	"github.com/anacrolix/torrent/metainfo"

[Samyoul]

A workable solution for this issue is to have different files for different build environments.

File Structure:

manager_desktop.go — This file will contain imports and code used only in desktop builds. Therefore only importing torrent related code.
manager_mobile.go — This file will be for mobile builds and will not include the torrent related packages.

Build based on GOOS

manager_desktop.go

// +build windows linux darwin

package communities

func WithTorrent(manager *Manager) {
    // Implementation specific to Desktop
}

manager_mobile.go

// +build android ios

package communities

// No use of the WithTorrent() func.

[siddarthkay]

here is an example of a PR I had made a while ago to make sure we build a certain part of this library only for android x86_64 architecture which used build flags.
status-im/tcp-shaker#1

[Samyoul]

Ok, I'm starting work on this now.