Case study

Comet: reconstructing GOG Galaxy's game communication service

Comet reimplements the game-facing GOG Galaxy Communication Service in Rust for use with alternative game launchers. It handles named SDK requests for library and authentication data, achievements, leaderboards, sessions, and overlay notifications. The project documents tracing Communication Service calls and identifies request types still pending.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 376
Last commit: 2026-10-28
Language: Rust
License (GitHub): Apache-2.0

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Requires GOG access_token, refresh_token, and user_id, which may be imported from a supported launcher.
Prerequisites: Some SDK versions require registration of the bundled dummy Windows service.
Limits: GET_GLOBAL_STATS_REQUEST and two overlay notifications, GAME_JOIN_REQUEST_NOTIFICATION and GAME_INVITE_SENT_NOTIFICATION, are listed as unfinished.
License: Licensed under Apache-2.0.

Cite

BibTeX

@misc{comet-gog-service-case,
  title = {{Comet: reconstructing GOG Galaxy's game communication service}},
  howpublished = {\url{https://github.com/imLinguin/comet}},
  url = {https://github.com/imLinguin/comet},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/comet-gog-service-case/}}
}

Plain text

Comet: reconstructing GOG Galaxy's game communication service. https://github.com/imLinguin/comet (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/comet-gog-service-case/

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Primary sources

README.md GitHub · imLinguin/comet · Revision 46c9152