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✨ feat: Host a relay on Hetzner (#114)
We are hosting a [MoQ](https://quic.video) relay on a remote (bare metal) server on Hetzner With a lot of help from @victorpahuus
This commit is contained in:
Wanjohi
GitHub
550
packages/moq/transport/control.ts
Normal file
550
packages/moq/transport/control.ts
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@@ -0,0 +1,550 @@
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import { Reader, Writer } from "./stream"
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export type Message = Subscriber | Publisher
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// Sent by subscriber
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export type Subscriber = Subscribe | Unsubscribe | AnnounceOk | AnnounceError
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export function isSubscriber(m: Message): m is Subscriber {
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return (
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m.kind == Msg.Subscribe || m.kind == Msg.Unsubscribe || m.kind == Msg.AnnounceOk || m.kind == Msg.AnnounceError
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)
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}
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// Sent by publisher
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export type Publisher = SubscribeOk | SubscribeError | SubscribeDone | Announce | Unannounce
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export function isPublisher(m: Message): m is Publisher {
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return (
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m.kind == Msg.SubscribeOk ||
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m.kind == Msg.SubscribeError ||
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m.kind == Msg.SubscribeDone ||
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m.kind == Msg.Announce ||
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m.kind == Msg.Unannounce
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)
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}
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// I wish we didn't have to split Msg and Id into separate enums.
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// However using the string in the message makes it easier to debug.
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// We'll take the tiny performance hit until I'm better at Typescript.
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export enum Msg {
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// NOTE: object and setup are in other modules
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Subscribe = "subscribe",
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SubscribeOk = "subscribe_ok",
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SubscribeError = "subscribe_error",
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SubscribeDone = "subscribe_done",
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Unsubscribe = "unsubscribe",
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Announce = "announce",
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AnnounceOk = "announce_ok",
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AnnounceError = "announce_error",
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Unannounce = "unannounce",
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GoAway = "go_away",
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}
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enum Id {
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// NOTE: object and setup are in other modules
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// Object = 0,
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// Setup = 1,
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Subscribe = 0x3,
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SubscribeOk = 0x4,
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SubscribeError = 0x5,
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SubscribeDone = 0xb,
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Unsubscribe = 0xa,
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Announce = 0x6,
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AnnounceOk = 0x7,
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AnnounceError = 0x8,
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Unannounce = 0x9,
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GoAway = 0x10,
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}
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export interface Subscribe {
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kind: Msg.Subscribe
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id: bigint
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trackId: bigint
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namespace: string
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name: string
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location: Location
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params?: Parameters
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}
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export type Location = LatestGroup | LatestObject | AbsoluteStart | AbsoluteRange
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export interface LatestGroup {
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mode: "latest_group"
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}
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export interface LatestObject {
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mode: "latest_object"
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}
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export interface AbsoluteStart {
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mode: "absolute_start"
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start_group: number
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start_object: number
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}
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export interface AbsoluteRange {
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mode: "absolute_range"
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start_group: number
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start_object: number
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end_group: number
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end_object: number
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}
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export type Parameters = Map<bigint, Uint8Array>
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export interface SubscribeOk {
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kind: Msg.SubscribeOk
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id: bigint
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expires: bigint
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latest?: [number, number]
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}
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export interface SubscribeDone {
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kind: Msg.SubscribeDone
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id: bigint
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code: bigint
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reason: string
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final?: [number, number]
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}
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export interface SubscribeError {
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kind: Msg.SubscribeError
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id: bigint
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code: bigint
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reason: string
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}
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export interface Unsubscribe {
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kind: Msg.Unsubscribe
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id: bigint
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}
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export interface Announce {
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kind: Msg.Announce
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namespace: string
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params?: Parameters
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}
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export interface AnnounceOk {
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kind: Msg.AnnounceOk
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namespace: string
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}
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export interface AnnounceError {
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kind: Msg.AnnounceError
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namespace: string
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code: bigint
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reason: string
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}
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export interface Unannounce {
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kind: Msg.Unannounce
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namespace: string
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}
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export class Stream {
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private decoder: Decoder
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private encoder: Encoder
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#mutex = Promise.resolve()
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constructor(r: Reader, w: Writer) {
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this.decoder = new Decoder(r)
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this.encoder = new Encoder(w)
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}
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// Will error if two messages are read at once.
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async recv(): Promise<Message> {
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const msg = await this.decoder.message()
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console.log("received message", msg)
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return msg
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}
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async send(msg: Message) {
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const unlock = await this.#lock()
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try {
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console.log("sending message", msg)
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await this.encoder.message(msg)
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} finally {
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unlock()
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}
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}
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async #lock() {
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// Make a new promise that we can resolve later.
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let done: () => void
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const p = new Promise<void>((resolve) => {
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done = () => resolve()
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})
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// Wait until the previous lock is done, then resolve our our lock.
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const lock = this.#mutex.then(() => done)
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// Save our lock as the next lock.
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this.#mutex = p
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// Return the lock.
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return lock
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}
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}
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export class Decoder {
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r: Reader
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constructor(r: Reader) {
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this.r = r
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}
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private async msg(): Promise<Msg> {
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const t = await this.r.u53()
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switch (t) {
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case Id.Subscribe:
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return Msg.Subscribe
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case Id.SubscribeOk:
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return Msg.SubscribeOk
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case Id.SubscribeDone:
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return Msg.SubscribeDone
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case Id.SubscribeError:
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return Msg.SubscribeError
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case Id.Unsubscribe:
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return Msg.Unsubscribe
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case Id.Announce:
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return Msg.Announce
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case Id.AnnounceOk:
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return Msg.AnnounceOk
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case Id.AnnounceError:
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return Msg.AnnounceError
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case Id.Unannounce:
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return Msg.Unannounce
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case Id.GoAway:
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return Msg.GoAway
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}
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throw new Error(`unknown control message type: ${t}`)
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}
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async message(): Promise<Message> {
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const t = await this.msg()
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switch (t) {
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case Msg.Subscribe:
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return this.subscribe()
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case Msg.SubscribeOk:
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return this.subscribe_ok()
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case Msg.SubscribeError:
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return this.subscribe_error()
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case Msg.SubscribeDone:
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return this.subscribe_done()
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case Msg.Unsubscribe:
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return this.unsubscribe()
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case Msg.Announce:
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return this.announce()
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case Msg.AnnounceOk:
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return this.announce_ok()
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case Msg.Unannounce:
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return this.unannounce()
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case Msg.AnnounceError:
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return this.announce_error()
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case Msg.GoAway:
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throw new Error("TODO: implement go away")
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}
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}
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private async subscribe(): Promise<Subscribe> {
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return {
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kind: Msg.Subscribe,
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id: await this.r.u62(),
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trackId: await this.r.u62(),
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namespace: await this.r.string(),
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name: await this.r.string(),
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location: await this.location(),
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params: await this.parameters(),
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}
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}
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private async location(): Promise<Location> {
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const mode = await this.r.u62()
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if (mode == 1n) {
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return {
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mode: "latest_group",
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}
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} else if (mode == 2n) {
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return {
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mode: "latest_object",
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}
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} else if (mode == 3n) {
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return {
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mode: "absolute_start",
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start_group: await this.r.u53(),
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start_object: await this.r.u53(),
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}
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} else if (mode == 4n) {
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return {
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mode: "absolute_range",
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start_group: await this.r.u53(),
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start_object: await this.r.u53(),
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end_group: await this.r.u53(),
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end_object: await this.r.u53(),
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}
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} else {
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throw new Error(`invalid filter type: ${mode}`)
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}
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}
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private async parameters(): Promise<Parameters | undefined> {
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const count = await this.r.u53()
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if (count == 0) return undefined
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const params = new Map<bigint, Uint8Array>()
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for (let i = 0; i < count; i++) {
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const id = await this.r.u62()
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const size = await this.r.u53()
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const value = await this.r.read(size)
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if (params.has(id)) {
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throw new Error(`duplicate parameter id: ${id}`)
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}
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params.set(id, value)
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}
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return params
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}
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private async subscribe_ok(): Promise<SubscribeOk> {
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const id = await this.r.u62()
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const expires = await this.r.u62()
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let latest: [number, number] | undefined
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const flag = await this.r.u8()
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if (flag === 1) {
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latest = [await this.r.u53(), await this.r.u53()]
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} else if (flag !== 0) {
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throw new Error(`invalid final flag: ${flag}`)
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}
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return {
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kind: Msg.SubscribeOk,
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id,
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expires,
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latest,
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}
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}
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private async subscribe_done(): Promise<SubscribeDone> {
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const id = await this.r.u62()
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const code = await this.r.u62()
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const reason = await this.r.string()
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let final: [number, number] | undefined
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const flag = await this.r.u8()
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if (flag === 1) {
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final = [await this.r.u53(), await this.r.u53()]
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} else if (flag !== 0) {
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throw new Error(`invalid final flag: ${flag}`)
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}
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return {
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kind: Msg.SubscribeDone,
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id,
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code,
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reason,
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final,
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}
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}
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private async subscribe_error(): Promise<SubscribeError> {
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return {
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kind: Msg.SubscribeError,
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id: await this.r.u62(),
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code: await this.r.u62(),
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reason: await this.r.string(),
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}
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}
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private async unsubscribe(): Promise<Unsubscribe> {
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return {
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kind: Msg.Unsubscribe,
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id: await this.r.u62(),
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}
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}
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private async announce(): Promise<Announce> {
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const namespace = await this.r.string()
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return {
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kind: Msg.Announce,
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namespace,
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params: await this.parameters(),
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}
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}
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private async announce_ok(): Promise<AnnounceOk> {
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return {
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kind: Msg.AnnounceOk,
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namespace: await this.r.string(),
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}
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}
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private async announce_error(): Promise<AnnounceError> {
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return {
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kind: Msg.AnnounceError,
|
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namespace: await this.r.string(),
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code: await this.r.u62(),
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reason: await this.r.string(),
|
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}
|
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}
|
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|
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private async unannounce(): Promise<Unannounce> {
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return {
|
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kind: Msg.Unannounce,
|
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namespace: await this.r.string(),
|
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}
|
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}
|
||||
}
|
||||
|
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export class Encoder {
|
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w: Writer
|
||||
|
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constructor(w: Writer) {
|
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this.w = w
|
||||
}
|
||||
|
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async message(m: Message) {
|
||||
switch (m.kind) {
|
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case Msg.Subscribe:
|
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return this.subscribe(m)
|
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case Msg.SubscribeOk:
|
||||
return this.subscribe_ok(m)
|
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case Msg.SubscribeError:
|
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return this.subscribe_error(m)
|
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case Msg.SubscribeDone:
|
||||
return this.subscribe_done(m)
|
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case Msg.Unsubscribe:
|
||||
return this.unsubscribe(m)
|
||||
case Msg.Announce:
|
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return this.announce(m)
|
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case Msg.AnnounceOk:
|
||||
return this.announce_ok(m)
|
||||
case Msg.AnnounceError:
|
||||
return this.announce_error(m)
|
||||
case Msg.Unannounce:
|
||||
return this.unannounce(m)
|
||||
}
|
||||
}
|
||||
|
||||
async subscribe(s: Subscribe) {
|
||||
await this.w.u53(Id.Subscribe)
|
||||
await this.w.u62(s.id)
|
||||
await this.w.u62(s.trackId)
|
||||
await this.w.string(s.namespace)
|
||||
await this.w.string(s.name)
|
||||
await this.location(s.location)
|
||||
await this.parameters(s.params)
|
||||
}
|
||||
|
||||
private async location(l: Location) {
|
||||
switch (l.mode) {
|
||||
case "latest_group":
|
||||
await this.w.u62(1n)
|
||||
break
|
||||
case "latest_object":
|
||||
await this.w.u62(2n)
|
||||
break
|
||||
case "absolute_start":
|
||||
await this.w.u62(3n)
|
||||
await this.w.u53(l.start_group)
|
||||
await this.w.u53(l.start_object)
|
||||
break
|
||||
case "absolute_range":
|
||||
await this.w.u62(3n)
|
||||
await this.w.u53(l.start_group)
|
||||
await this.w.u53(l.start_object)
|
||||
await this.w.u53(l.end_group)
|
||||
await this.w.u53(l.end_object)
|
||||
}
|
||||
}
|
||||
|
||||
private async parameters(p: Parameters | undefined) {
|
||||
if (!p) {
|
||||
await this.w.u8(0)
|
||||
return
|
||||
}
|
||||
|
||||
await this.w.u53(p.size)
|
||||
for (const [id, value] of p) {
|
||||
await this.w.u62(id)
|
||||
await this.w.u53(value.length)
|
||||
await this.w.write(value)
|
||||
}
|
||||
}
|
||||
|
||||
async subscribe_ok(s: SubscribeOk) {
|
||||
await this.w.u53(Id.SubscribeOk)
|
||||
await this.w.u62(s.id)
|
||||
await this.w.u62(s.expires)
|
||||
|
||||
if (s.latest !== undefined) {
|
||||
await this.w.u8(1)
|
||||
await this.w.u53(s.latest[0])
|
||||
await this.w.u53(s.latest[1])
|
||||
} else {
|
||||
await this.w.u8(0)
|
||||
}
|
||||
}
|
||||
|
||||
async subscribe_done(s: SubscribeDone) {
|
||||
await this.w.u53(Id.SubscribeDone)
|
||||
await this.w.u62(s.id)
|
||||
await this.w.u62(s.code)
|
||||
await this.w.string(s.reason)
|
||||
|
||||
if (s.final !== undefined) {
|
||||
await this.w.u8(1)
|
||||
await this.w.u53(s.final[0])
|
||||
await this.w.u53(s.final[1])
|
||||
} else {
|
||||
await this.w.u8(0)
|
||||
}
|
||||
}
|
||||
|
||||
async subscribe_error(s: SubscribeError) {
|
||||
await this.w.u53(Id.SubscribeError)
|
||||
await this.w.u62(s.id)
|
||||
}
|
||||
|
||||
async unsubscribe(s: Unsubscribe) {
|
||||
await this.w.u53(Id.Unsubscribe)
|
||||
await this.w.u62(s.id)
|
||||
}
|
||||
|
||||
async announce(a: Announce) {
|
||||
await this.w.u53(Id.Announce)
|
||||
await this.w.string(a.namespace)
|
||||
await this.w.u53(0) // parameters
|
||||
}
|
||||
|
||||
async announce_ok(a: AnnounceOk) {
|
||||
await this.w.u53(Id.AnnounceOk)
|
||||
await this.w.string(a.namespace)
|
||||
}
|
||||
|
||||
async announce_error(a: AnnounceError) {
|
||||
await this.w.u53(Id.AnnounceError)
|
||||
await this.w.string(a.namespace)
|
||||
await this.w.u62(a.code)
|
||||
await this.w.string(a.reason)
|
||||
}
|
||||
|
||||
async unannounce(a: Unannounce) {
|
||||
await this.w.u53(Id.Unannounce)
|
||||
await this.w.string(a.namespace)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user