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import { logger } from "@coder/logger"

import { Query } from "express-serve-static-core"

import { promises as fs } from "fs"

export type Settings = { [key: string]: Settings | string | boolean | number }

/**

* Provides read and write access to settings.

*/

export class SettingsProvider<T> {

public constructor(private readonly settingsPath: string) {}

/**

* Read settings from the file. On a failure return last known settings and

* log a warning.

*/

public async read(): Promise<T> {

try {

const raw = (await fs.readFile(this.settingsPath, "utf8")).trim()

return raw ? JSON.parse(raw) : {}

} catch (error: any) {

if (error.code !== "ENOENT") {

logger.warn(error.message)

}

}

return {} as T

}

/**

* Write settings combined with current settings. On failure log a warning.

* Settings will be merged shallowly.

*/

public async write(settings: Partial<T>): Promise<void> {

try {

const oldSettings = await this.read()

const nextSettings = { ...oldSettings, ...settings }

await fs.writeFile(this.settingsPath, JSON.stringify(nextSettings, null, 2))

} catch (error: any) {

logger.warn(error.message)

}

}

}

export interface UpdateSettings {

update: {

checked: number

version: string

}

}

/**

* Global code-server settings.

*/

export interface CoderSettings extends UpdateSettings {

query?: Query

}