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Keep ws connection live #52

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Keep ws connection live #52

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17 changes: 14 additions & 3 deletions examples/text-to-speech-websockets/measure-latency-node/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ async function textToSpeechInputStreaming(text: string, config: Config): Promise
let firstByteTime: number | undefined;
let startTime: number | undefined;
let firstByte = true;
let lastSentTime: number | undefined;

const uri = `wss://api.elevenlabs.io/v1/text-to-speech/${config.voiceId}/stream-input?model_id=${config.model}`;
const websocket = new WebSocket(uri, {
Expand Down Expand Up @@ -63,8 +64,18 @@ async function textToSpeechInputStreaming(text: string, config: Config): Promise
startTime = new Date().getTime()

websocket.send(JSON.stringify({ text: text }));

websocket.send(JSON.stringify({ text: '' }));
lastSentTime = new Date().getTime();

// set repeated time out to keep the connection alive
setInterval(() => {
const elapsed_ = new Date().getTime();
if (typeof lastSentTime === 'undefined') {
throw new Error('Last sent time is not recorded.');
}

console.log(`Time since last sent: ${elapsed_ - lastSentTime} ms`);
websocket.send(JSON.stringify({ text: ' ' }));
}, 10000);
});

// Log received data and the time elapsed since the connection started.
Expand Down Expand Up @@ -162,7 +173,7 @@ async function main() {
apiKey: argv.api_key || "",
model: argv.model || 'eleven_turbo_v2',
voiceId: argv.voiceId || 'Xb7hH8MSUJpSbSDYk0k2',
numOfTrials: 5
numOfTrials: 1
} satisfies Config;

console.log('Using model:', config.model);
Expand Down
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