Domain Modeling - Design Workflow: turn start

[kayac-chang]

implement design of https://hackmd.io/KvV2Ou3HS9uN11OUpsAUzA?both#Workflow-turn-start

[JohnsonMao]

Command

type TurnStartCommand = {
    playerId: string;
}

Event

type TurnStartEvent = {
    playerId: string;
}

Error

type TurnStartError = EventSourceWriteError

Type

type TurnStart = (eventsource: EventSource, command: TurnStartCommand) => ResultAsync<TurnStartEvent, TurnStartError>

Workflow

workflow: turn start
    input:
        event source
        turn start command
    output:
        async result of 
            ok -> turn start event
            err -> turn start error
    step:
        append event to event source
            if error occured:
                return event source write error
            otherwise:
                return turn start event

[kayac-chang]

@JohnsonMao
We don't have to check in turn start

• assign role cards to all players,
• place start and goal cards
• deal cards to all players

every workflow just need to consider itself, validation could be separated out and integrate by composition.

[JohnsonMao]

ok~

[kayac-chang]

@JohnsonMao
The design look good to me, could you create a PR to add types into @package/domain, thank you.

[kayac-chang]

Another thing I just wonder, why TurnStartCommand need to support array?

[JohnsonMao]

I apologize for the misunderstanding.
I mistakenly thought "turn start" referred to "round start,"
but I have now adjusted the workflow and types accordingly.