erlang_ls starts a server on 0.0.0.0 even with stdio

[masad-frost]

Describe the bug
Erlang ls in stdio mode still starts a server on 0.0.0.0 with a random port.

The context here is that I'm trying to add erlang_ls to replit.com but Replit exposes things on 0.0.0.0 to the world, and we don't want to do that in this case.

To Reproduce

1. erlang_ls --transport stdio
2. server starts at random port on 0.0.0.0 host

Expected behavior
Either no server is started, but if that's necessary for running the language server i expect it to start on 127.0.0.1 (localhost) instead.

Actual behavior
Explained before

Context

• erlang_ls version (tag/sha): any version
• Editor used: any
• LSP client used: any

[robertoaloi]

Hi @masad-frost , Erlang LS uses Erlang distribution to have the Language Server talking to the "project node" (e.g. for reloading code on save). This will result in a daemon (EPMD, Erlang Port Mapper Daemon) starting at a random port. I guess that's what you are referring to. You should be able to configure this behaviour using Environment Variables. See, for example, https://www.erlang.org/doc/man/epmd.html.