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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,171 @@ | ||
| --- | ||
| meta: | ||
| - name: description | ||
| content: Guide to implement Server-sent events with Ts.ED. | ||
| - name: keywords | ||
| content: ts.ed express typescript sse server-sent events node.js javascript decorators | ||
| --- | ||
|
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| # Server-sent events | ||
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| Server-sent events let you push data to the client. It's a simple way to send data from the server to the client. The data is sent as a stream of messages, with an optional event name and id. It's a simple way to send data from the server to the client. | ||
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| ## Installation | ||
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| Before using the Server-sent events, we need to install the `@tsed/sse` module. | ||
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| <Tabs class="-code"> | ||
| <Tab label="npm"> | ||
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| ```bash | ||
| npm install --save @tsed/sse | ||
| ``` | ||
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| </Tab> | ||
|
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| <Tab label="yarn"> | ||
|
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| ```bash | ||
| yarn add --save @tsed/sse | ||
| ``` | ||
|
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| </Tab> | ||
| <Tab label="pnpm"> | ||
|
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| ```bash | ||
| pnpm add --save @tsed/sse | ||
| ``` | ||
|
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| </Tab> | ||
| <Tab label="bun"> | ||
|
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| ```bash | ||
| bun add --save @tsed/sse | ||
| ``` | ||
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| </Tab> | ||
| </Tabs> | ||
|
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| Then add the following configuration in your Server: | ||
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| ```typescript | ||
| import {Configuration} from "@tsed/common"; | ||
| import "@tsed/sse"; // import sse Ts.ED module | ||
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| @Configuration({ | ||
| acceptMimes: ["application/json", "text/event-stream"] | ||
| }) | ||
| export class Server {} | ||
| ``` | ||
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| ::: warning | ||
| There is a known issue with the `compression` middleware. The | ||
| `compression` middleware should be disabled to work correctly with Server-sent events. | ||
| ::: | ||
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| ## Features | ||
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| - Support decorator usage to enable event-stream on an endpoint, | ||
| - Support Node.js stream like `EventEmmiter` to emit events from your controller to your consumer, | ||
| - Support `Observable` from `rxjs` to emit events from your controller to your consumer. | ||
| - Support `@tsed/json-mapper` to serialize your model before sending it to the client. | ||
| - Gives an API compatible with Express.js and Koa.js. | ||
|
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| ## Enable event-stream | ||
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| To enable the event-stream on an endpoint, you need to use the `@EventStream()` decorator on a method of a controller. | ||
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| ```typescript | ||
| import {Controller} from "@tsed/di"; | ||
| import {Get} from "@tsed/schema"; | ||
| import {EventStream, EventStreamCtx} from "@tsed/sse"; | ||
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| @Controller("/sse") | ||
| export class MyCtrl { | ||
| @Get("/events") | ||
| @EventStream() | ||
| events(@EventStreamCtx() eventStream: EventStreamCtx) { | ||
| let intervalId: ReturnType<typeof setInterval>; | ||
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| eventStream.on("close", () => { | ||
| clearInterval(intervalId); | ||
| }); | ||
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| eventStream.on("end", () => { | ||
| clearInterval(intervalId); | ||
| }); | ||
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| intervalId = setInterval(() => { | ||
| // Ts.ED support Model serialization using json-mapper here | ||
| eventStream.emit("event", new Date()); | ||
| }, 1000); | ||
| } | ||
| } | ||
| ``` | ||
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| ### Stream events | ||
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| You can use Node.js stream like `EventEmmiter` to emit events from your controller to your consumer: | ||
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| ```ts | ||
| import {EventStream} from "@tsed/sse"; | ||
| import {Controller} from "@tsed/di"; | ||
| import {Get} from "@tsed/schema"; | ||
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| @Controller("/sse") | ||
| export class MyCtrl { | ||
| private eventEmitter = new EventEmitter(); | ||
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| $onInit() { | ||
| setInterval(() => { | ||
| this.eventEmitter.emit("message", new Date()); | ||
| }, 1000); | ||
| } | ||
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| @Get("/events") | ||
| @EventStream() | ||
| events() { | ||
| return this.eventEmitter; | ||
| } | ||
| } | ||
| ``` | ||
|
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| ### Observable | ||
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| You can also use `Observable` from `rxjs` to emit events from your controller to your consumer: | ||
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| ```ts | ||
| import {Controller} from "@tsed/di"; | ||
| import {Get} from "@tsed/schema"; | ||
| import {EventStream} from "@tsed/sse"; | ||
| import {Observable} from "rxjs"; | ||
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| @Controller("/sse") | ||
| export class MyCtrl { | ||
| @Get("/events") | ||
| @EventStream() | ||
| events() { | ||
| const observable = new Observable((observer) => { | ||
| setInterval(() => { | ||
| observer.next(new Date()); | ||
| }, 1000); | ||
| }); | ||
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| return observable; | ||
| } | ||
| } | ||
| ``` | ||
|
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| ## Author | ||
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| <GithubContributors :users="['Romakita']"/> | ||
|
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| ## Maintainers <Badge text="Help wanted" /> | ||
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| <GithubContributors :users="['Romakita']"/> | ||
|
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| <div class="flex items-center justify-center p-5"> | ||
| <Button href="/contributing.html" class="rounded-medium"> | ||
| Become maintainer | ||
| </Button> | ||
| </div> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,5 @@ | ||
| { | ||
| "directory": ["./src"], | ||
| "exclude": ["**/__mock__", "**/__mocks__", "**/*.spec.ts", "**/getConfiguration.ts"], | ||
| "exclude": ["**/__mock__", "**/__mocks__", "**/*.spec.ts", "**/getConfiguration.ts", "FakeResponse.ts"], | ||
| "delete": true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| import {EventEmitter} from "node:events"; | ||
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| export class FakeResponse extends EventEmitter { | ||
| headers: Record<string, unknown> = {}; | ||
| locals: Record<string, unknown> = {}; | ||
| statusCode: number = 200; | ||
| data: any; | ||
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| constructor(opts = {}) { | ||
| super(); | ||
|
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| Object.assign(this, opts); | ||
| } | ||
|
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| status(code: number) { | ||
| this.statusCode = code; | ||
| return this; | ||
| } | ||
|
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| contentType(content: string) { | ||
| this.set("content-type", content); | ||
| } | ||
|
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| contentLength(content: number) { | ||
| this.set("content-length", content); | ||
| } | ||
|
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| redirect(status: number, path: string) { | ||
| this.statusCode = status; | ||
| this.set("location", path); | ||
| } | ||
|
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| location(path: string) { | ||
| this.set("location", path); | ||
| } | ||
|
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| get(key: string) { | ||
| return this.headers[key.toLowerCase()]; | ||
| } | ||
|
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| getHeaders() { | ||
| return this.headers; | ||
| } | ||
|
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| set(key: string, value: any) { | ||
| this.headers[key.toLowerCase()] = value; | ||
| return this; | ||
| } | ||
|
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| setHeader(key: string, value: any) { | ||
| this.headers[key.toLowerCase()] = value; | ||
| return this; | ||
| } | ||
|
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| send(data: any) { | ||
| this.data = data; | ||
| } | ||
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| json(data: any) { | ||
| this.data = data; | ||
| } | ||
|
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| write(chunk: any) { | ||
| this.emit("data", chunk); | ||
| } | ||
|
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| end(data: any) { | ||
| data !== undefined && (this.data = data); | ||
|
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| this.emit("end"); | ||
| } | ||
| } |
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