CD
Cloudflare DevelopersOttomated

Sure -

Sure - The Durable Object handles websocket clients for a multiplayer game using a deterministic physics engine. The physics are executed on both the clients and the server. Serializing the physics world costs up to a few KB per player. To join games, I have a lobbies table in D1 with a game_state column: 'waiting' | 'playing' | 'finished'. I need to set the game to the finished state when it's abandoned, so if the player rejoins the websocket later, it won't re-initialize the DO. Because the transactional storage API is so expensive, I want to treat crashed games as permanently dead and show clients an error when they reconnect.
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Erwin•196d ago
Moving this to a thread btw.. keeps the channel cleaner for other people
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Ottomated•196d ago
👍 Hmm. I do already have a tick_index that gets incremented, so if the client detects that it's decreased it knows it's broken? seems really hard to get right
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Erwin•196d ago
I mean when the DO is reinitialised, it wont have any state.. so that might be a clue? When the DO gets a regular gaming message when it doesn't have any state, it knows something is up I would imagine?
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Ottomated•196d ago
that might work But then I am letting my clients dictate when I've crashed Also they don't send heartbeats But I guess they would auto-reconnect... or maybe not? because if I'm using the Hibernation API, when the DO crashes they would stay connected or is that wrong? I guess the foolproof solution is to store some "game_started" boolean in transactional storage, and then if that's set to true when the DO is constructed I know it's in a bad state However, the flaw with that solution is that I only detect the crash once the clients reconnect - it doesn't detect abandonment
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Erwin•196d ago
The clients would try to reconnect yes. So you would receive a message. Now I don't know your protocol obviously, but I can imagine that the messages you receive during a game are different than before a game?
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Ottomated•196d ago
My only concern is a malicious client here.
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Erwin•196d ago
Just kill that client? And if all connections are killed clean up and let the DO die? I am not sure if you can set a timeout on the hibernation API? I haven't used it myself.. but otherwise you will want to use an alarm for that
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Ottomated•196d ago
I mean if my metric for detecting a crash is if a client sends the wrong type of message, a malicious client could send that message intentionally and kill the DO
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Erwin•196d ago
Don't kill the DO.. kill the client connection.
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Ottomated•196d ago
I need to write to D1 that the lobby is dead
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Erwin•196d ago
And if all connections are gone, the DO will die
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Ottomated•196d ago
I guess that would work, but now we're back to needing a way to detect when the DO dies naturally
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Erwin•196d ago
You mean when all clients stop playing? Hmm.. so I just realised that in your case the DO can still be unloaded, even though gamers are connected right?
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Ottomated•196d ago
There are 3 cases for the DO dying: 1. Game ends, I kick all clients and update D1 2. Game is abandoned, all clients are disconnected - I guess I do this on a close event + a timer? Still impractical 3. DO crashes, client almost certainly instantly auto-reconnects, I detect that the DO is being initialized in a bad state and update D1 I only want to hibernate in the waiting state - during the playing state I'm broadcasting 10 ticks per second
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Erwin•196d ago
ok.. that makes sense. So how long can the waiting state take?
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Ottomated•196d ago
Until the lobby fills
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