Server time vs client time

dominx99

Hello,

Is it possible to fetch somehow timestamp of the server on the client side?

I have built a cooldown system (on the backend I save full timestamp) and I want to show the user left cooldown time, but my client has different time generated by Date.now() than server and it is not precise.

I tried to get timestamp through inject/context like this:

const { rpgEngine } = useContext(RpgReactContext);
console.log(rpgEngine.tick);

and in fact, there is a timestamp, but it is counted only for server uptime (from 0), so it won't work when the cooldown is eg. 1 hour and the server goes down in the meantime.

I could use a socket to send regular time to the client but it seems to me not efficient, isn't it?

Is there a way to fetch the full timestamp?

Samarium

Hey,

I may have a solution, but it's ultimately socket that is sent regularly to the client.

main/maps/map.ts

import { MapData, RpgMap } from '@rpgjs/server'

@MapData({
    id: 'map',
    file: require('./map.tmx'),
    syncSchema: {
        count: Number
    }
})
export default class TownMap extends RpgMap {
    count: number = Date.now()

    onInit() {
        setInterval(() => {
            this.count = Date.now()
        }, 1000)
    }
}

You can create a map and define a property to be synchronized.

And main/scene-map.ts

import { type RpgSceneMapHooks, RpgSceneMap } from '@rpgjs/client'

const sceneMap: RpgSceneMapHooks = {
    onAfterLoading(scene: RpgSceneMap) {
        scene.valuesChange.subscribe((obj) => {
            console.log(obj.data.count)
         })
    },
}

export default sceneMap

dominx99

Samarium

Hello,

Thank you very much for tip.

I see that the scene already has time accessible by obj.time, so it is even better.

scene.valuesChange.subscribe((obj) => {
    console.log(obj.time)
})

It is triggered only when data is changed on the scene and I want to rerender cooldown GUI for 60fps, so every _17ms.
But it's okay because I save time on the client side and add elapsed time until a new time is sent from the server.

Nice!