speechflow
Version:
Speech Processing Flow Graph
153 lines • 6.22 kB
JavaScript
;
/*
** SpeechFlow - Speech Processing Flow Graph
** Copyright (c) 2024-2025 Dr. Ralf S. Engelschall <rse@engelschall.com>
** Licensed under GPL 3.0 <https://spdx.org/licenses/GPL-3.0-only>
*/
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o["default"] = v;
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var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
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var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
/* standard dependencies */
const node_stream_1 = __importDefault(require("node:stream"));
/* external dependencies */
const translate_1 = require("@google-cloud/translate");
const arktype = __importStar(require("arktype"));
/* internal dependencies */
const speechflow_node_1 = __importDefault(require("./speechflow-node"));
const util = __importStar(require("./speechflow-util"));
/* SpeechFlow node for Google Translate text-to-text translations */
class SpeechFlowNodeT2TGoogle extends speechflow_node_1.default {
/* declare official node name */
static name = "t2t-google";
/* internal state */
client = null;
/* construct node */
constructor(id, cfg, opts, args) {
super(id, cfg, opts, args);
/* declare node configuration parameters */
this.configure({
key: { type: "string", val: process.env.SPEECHFLOW_GOOGLE_KEY ?? "" },
src: { type: "string", pos: 0, val: "de", match: /^(?:de|en|fr|it)$/ },
dst: { type: "string", pos: 1, val: "en", match: /^(?:de|en|fr|it)$/ }
});
/* validate API key and project */
if (this.params.key === "")
throw new Error("Google Cloud API credentials JSON key is required");
/* sanity check situation */
if (this.params.src === this.params.dst)
throw new Error("source and destination languages cannot be the same");
/* declare node input/output format */
this.input = "text";
this.output = "text";
}
/* one-time status of node */
async status() {
return {};
}
/* open node */
async open() {
/* instantiate Google Translate client */
const data = util.run("Google Cloud API credentials key", () => JSON.parse(this.params.key));
const credentials = util.importObject("Google Cloud API credentials key", data, arktype.type({
project_id: "string",
private_key: "string",
client_email: "string",
}));
this.client = new translate_1.TranslationServiceClient({
credentials: {
private_key: credentials.private_key,
client_email: credentials.client_email
},
projectId: credentials.project_id
});
/* provide text-to-text translation */
const translate = util.runner("Google Translate API", async (text) => {
const [response] = await this.client.translateText({
parent: `projects/${credentials.project_id}/locations/global`,
contents: [text],
mimeType: "text/plain",
sourceLanguageCode: this.params.src,
targetLanguageCode: this.params.dst
});
return response.translations?.[0]?.translatedText ?? text;
});
/* establish a duplex stream and connect it to Google Translate */
this.stream = new node_stream_1.default.Transform({
readableObjectMode: true,
writableObjectMode: true,
decodeStrings: false,
highWaterMark: 1,
transform(chunk, encoding, callback) {
if (Buffer.isBuffer(chunk.payload))
callback(new Error("invalid chunk payload type"));
else if (chunk.payload === "") {
this.push(chunk);
callback();
}
else {
translate(chunk.payload).then((payload) => {
const chunkNew = chunk.clone();
chunkNew.payload = payload;
this.push(chunkNew);
callback();
}).catch((error) => {
callback(util.ensureError(error));
});
}
},
final(callback) {
this.push(null);
callback();
}
});
}
/* close node */
async close() {
/* close stream */
if (this.stream !== null) {
this.stream.destroy();
this.stream = null;
}
/* shutdown Google Translate client */
if (this.client !== null) {
this.client.close();
this.client = null;
}
}
}
exports.default = SpeechFlowNodeT2TGoogle;
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