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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SseStream = void 0;
const shared_utils_1 = require("@nestjs/common/utils/shared.utils");
const stream_1 = require("stream");
function toDataString(data) {
if ((0, shared_utils_1.isObject)(data)) {
return toDataString(JSON.stringify(data));
}
return data
.split(/\r\n|\r|\n/)
.map(line => `data: ${line}\n`)
.join('');
}
/**
* Adapted from https://raw.githubusercontent.com/EventSource/node-ssestream
* Transforms "messages" to W3C event stream content.
* See https://html.spec.whatwg.org/multipage/server-sent-events.html
* A message is an object with one or more of the following properties:
* - data (String or object, which gets turned into JSON)
* - type
* - id
* - retry
*
* If constructed with a HTTP Request, it will optimise the socket for streaming.
* If this stream is piped to an HTTP Response, it will set appropriate headers.
*/
class SseStream extends stream_1.Transform {
constructor(req) {
super({ objectMode: true });
this.lastEventId = null;
if (req && req.socket) {
req.socket.setKeepAlive(true);
req.socket.setNoDelay(true);
req.socket.setTimeout(0);
}
}
pipe(destination, options) {
if (destination.writeHead) {
destination.writeHead(200, Object.assign(Object.assign({}, options === null || options === void 0 ? void 0 : options.additionalHeaders), {
// See https://github.com/dunglas/mercure/blob/master/hub/subscribe.go#L124-L130
'Content-Type': 'text/event-stream', Connection: 'keep-alive',
// Disable cache, even for old browsers and proxies
'Cache-Control': 'private, no-cache, no-store, must-revalidate, max-age=0, no-transform', Pragma: 'no-cache', Expire: '0',
// NGINX support https://www.nginx.com/resources/wiki/start/topics/examples/x-accel/#x-accel-buffering
'X-Accel-Buffering': 'no' }));
destination.flushHeaders();
}
destination.write('\n');
return super.pipe(destination, options);
}
_transform(message, encoding, callback) {
let data = message.type ? `event: ${message.type}\n` : '';
data += message.id ? `id: ${message.id}\n` : '';
data += message.retry ? `retry: ${message.retry}\n` : '';
data += message.data ? toDataString(message.data) : '';
data += '\n';
this.push(data);
callback();
}
/**
* Calls `.write` but handles the drain if needed
*/
writeMessage(message, cb) {
if (!message.id) {
this.lastEventId++;
message.id = this.lastEventId.toString();
}
if (!this.write(message, 'utf-8', cb)) {
this.once('drain', cb);
}
else {
process.nextTick(cb);
}
}
}
exports.SseStream = SseStream;