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Pokemon Showdown architecture
At the highest level, PS is split into three parts:
- Client
- Login server
- Game server
The game server is in this repository, smogon/pokemon-showdown, while the client and login server are in smogon/pokemon-showdown-client. All three communicate directly with each other.
Game server
The game server is written in TypeScript and runs on Node.js.
Its entry point is server/index.ts, which launches several major components:
-
server/sockets.ts sets up a SockJS (abstracted WebSocket) server to accept connections from clients
-
server/users.ts sets up
Users, which wraps the SockJS connections in a system that handles users -
server/rooms.ts sets up
Rooms, which handles the individual chat rooms and battle rooms -
server/chat.ts sets up
Chat, which handles chat commands and messages coming in from users (all client-to-server commands are routed through there)
Rooms also includes support for battle rooms, which is where the game simulation itself is done. Game simulation code is in sim/.
Client
The client is built in a mix of TypeScript and JavaScript, with a mostly hand-rolled framework built on Backbone. There’s a rewrite to migrate it to Preact but it’s very stalled.
Its entry point is index.template.html.
It was written long ago, so instead of a single JS entry point, it includes a lot of JS files. Everything important is launched from js/client.js.
Login server
The client’s login server, which handles logins and most database interaction, is written in PHP, with a rewrite to TypeScript in progress. The backend is split between a MySQL InnoDB database and a Percona database, with a migration to Postgres planned.
Its entry point is action.php.