Jon Staab
34 lines
825 B
TypeScript
34 lines
825 B
TypeScript
import {writable} from "svelte/store"
|
|
import {randomId} from "@welshman/lib"
|
|
import {projection} from "./base.js"
|
|
import type {IApp} from "../app.js"
|
|
|
|
export type LogMessage = {
|
|
source: string
|
|
id: string
|
|
at: number
|
|
[key: string]: unknown
|
|
}
|
|
|
|
/**
|
|
* A logger which stores messages durably for inspection. Subscribe to `messages`
|
|
* (a projection) to read the log; append with `log(source, {...})`.
|
|
*/
|
|
export class Logger {
|
|
protected store = writable<LogMessage[]>([])
|
|
messages = projection(this.store)
|
|
|
|
constructor(protected readonly app: IApp) {}
|
|
|
|
log(
|
|
source: string,
|
|
{
|
|
id = randomId(),
|
|
at = Date.now(),
|
|
...message
|
|
}: {id?: string; at?: number; [key: string]: unknown},
|
|
) {
|
|
this.store.update($messages => $messages.concat({source, id, at, ...message}).slice(-1000))
|
|
}
|
|
}
|