/
bucket.ts
252 lines (218 loc) · 7.14 KB
/
bucket.ts
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// based on https://github.com/discordjs/discord.js/blob/master/src/rest/RequestHandler.js
// adapted to work with harmony rest manager
/* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
import { delay } from '../utils/delay.ts'
import { DiscordAPIError, HTTPError } from './error.ts'
import type { RESTManager } from './manager.ts'
import { RequestQueue } from './queue.ts'
import { APIRequest } from './request.ts'
// It returns JSON objects which are untyped so
async function parseResponse(res: Response, raw: boolean): Promise<any> {
let result
if (res.status === 204) result = Promise.resolve(undefined)
else if (
res.headers.get('content-type')?.startsWith('application/json') === true
)
result = res.json()
else result = await res.arrayBuffer().then((e) => new Uint8Array(e))
if (raw) {
return { response: res, body: result }
} else return result
}
function getAPIOffset(serverDate: number | string): number {
return new Date(serverDate).getTime() - Date.now()
}
function calculateReset(
reset: number | string,
serverDate: number | string
): number {
return new Date(Number(reset) * 1000).getTime() - getAPIOffset(serverDate)
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
let invalidCount = 0
let invalidCountResetTime: number | null = null
export class BucketHandler {
queue = new RequestQueue()
reset = -1
remaining = -1
limit = -1
constructor(public manager: RESTManager) {}
// Returns Response (untyped JSON)
async push(request: APIRequest): Promise<any> {
await this.queue.wait()
let res
try {
res = await this.execute(request)
} finally {
this.queue.shift()
}
return res
}
get globalLimited(): boolean {
return (
this.manager.globalRemaining <= 0 &&
Date.now() < Number(this.manager.globalReset)
)
}
get localLimited(): boolean {
return this.remaining <= 0 && Date.now() < this.reset
}
get limited(): boolean {
return this.globalLimited || this.localLimited
}
get inactive(): boolean {
return this.queue.remaining === 0 && !this.limited
}
async globalDelayFor(ms: number): Promise<void> {
return await new Promise((resolve) => {
this.manager.setTimeout(() => {
this.manager.globalDelay = null
resolve()
}, ms)
})
}
async execute(request: APIRequest): Promise<any> {
while (this.limited) {
const isGlobal = this.globalLimited
let limit, timeout, delayPromise
if (isGlobal) {
limit = this.manager.globalLimit
timeout =
// eslint-disable-next-line @typescript-eslint/restrict-plus-operands
Number(this.manager.globalReset) +
this.manager.restTimeOffset -
Date.now()
if (typeof this.manager.globalDelay !== 'number') {
this.manager.globalDelay = this.globalDelayFor(timeout)
}
delayPromise = this.manager.globalDelay
} else {
limit = this.limit
// eslint-disable-next-line @typescript-eslint/restrict-plus-operands
timeout = this.reset + this.manager.restTimeOffset - Date.now()
delayPromise = delay(timeout)
}
this.manager.client?.emit('rateLimit', {
timeout,
limit,
method: request.method,
path: request.path,
global: isGlobal
})
await delayPromise
}
// eslint-disable-next-line @typescript-eslint/strict-boolean-expressions
if (!this.manager.globalReset || this.manager.globalReset < Date.now()) {
this.manager.globalReset = Date.now() + 1000
this.manager.globalRemaining = this.manager.globalLimit
}
this.manager.globalRemaining--
// Perform the request
let res
try {
res = await request.execute()
} catch (_error) {
// For backward compatibility.
const error = _error as HTTPError
if (request.retries === this.manager.retryLimit) {
throw new HTTPError(
error.message,
error.constructor.name,
error.code,
request.method,
request.path
)
}
request.retries++
return await this.execute(request)
}
let sublimitTimeout
if (res?.headers !== undefined) {
const serverDate = res.headers.get('date')
const limit = res.headers.get('x-ratelimit-limit')
const remaining = res.headers.get('x-ratelimit-remaining')
const reset = res.headers.get('x-ratelimit-reset')
this.limit = limit !== null ? Number(limit) : Infinity
this.remaining = remaining !== null ? Number(remaining) : 1
this.reset =
reset !== null ? calculateReset(reset, serverDate!) : Date.now()
if (request.path.includes('reactions') === true) {
this.reset =
new Date(serverDate!).getTime() - getAPIOffset(serverDate!) + 250
}
let retryAfter: number | null | string = res.headers.get('retry-after')
retryAfter = retryAfter !== null ? Number(retryAfter) * 1000 : -1
if (retryAfter > 0) {
// eslint-disable-next-line @typescript-eslint/strict-boolean-expressions
if (res.headers.get('x-ratelimit-global')) {
this.manager.globalRemaining = 0
this.manager.globalReset = Date.now() + retryAfter
} else if (!this.localLimited) {
sublimitTimeout = retryAfter
}
}
}
if (res.status === 401 || res.status === 403 || res.status === 429) {
// eslint-disable-next-line @typescript-eslint/strict-boolean-expressions
if (!invalidCountResetTime || invalidCountResetTime < Date.now()) {
invalidCountResetTime = Date.now() + 1000 * 60 * 10
invalidCount = 0
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
invalidCount++
}
if (res.ok === true) {
return await parseResponse(res, request.options.rawResponse ?? false)
}
if (res.status >= 400 && res.status < 500) {
if (res.status === 429) {
this.manager.client?.emit(
'debug',
`Rate-Limited on route ${request.path}${
sublimitTimeout !== undefined ? ' for sublimit' : ''
}`
)
if (sublimitTimeout !== undefined) {
await delay(sublimitTimeout)
}
return await this.execute(request)
}
let data
try {
data = await parseResponse(res, false)
} catch (_err) {
const err = _err as HTTPError
throw new HTTPError(
err.message,
err.constructor.name,
err.code,
request.method,
request.path
)
}
throw new DiscordAPIError({
url: request.path,
errors: data?.errors,
status: res.status,
method: request.method,
message: data?.message,
code: data?.code,
requestData: request.options.data
})
}
if (res.status >= 500 && res.status < 600) {
if (request.retries === this.manager.retryLimit) {
throw new HTTPError(
res.statusText,
res.constructor.name,
res.status,
request.method,
request.path
)
}
request.retries++
return await this.execute(request)
}
return null
}
}