使用 Google 云存储将音频文件从 Google Text-to-Speech 保存到 Firebase 存储？
Save an audiofile from Google Text-to-Speech to Firebase Storage using Google Cloud Storage?
我们正在尝试使用 Google 云函数从 Google Text-to-Speech 获取音频文件并将其保存到 Firebase 存储。 Google Text-to-Speech 的 documentation 展示了如何获取音频文件并将其保存在本地：
// Performs the Text-to-Speech request
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
const writeFile = util.promisify(fs.writeFile);
await writeFile('output.mp3', response.audioContent, 'binary');
console.log('Audio content written to file: output.mp3');
这会导致错误消息 Error: EROFS: read-only file system。 Google Cloud Storage 不允许在本地写入文件。
使用 Firebase 存储 bucket.upload() 有一些问题：
const destinationPath = 'Audio/Spanish' + filename.ogg;
// Performs the Text-to-Speech request
const [response] = await client.synthesizeSpeech(request);
// response.audioContent is the downloaded file
await bucket.upload(response.audioContent, {
destination: destinationPath
));
错误信息是TypeError: Path must be a string。 bucket.upload() 的第一个参数是 The fully qualified path to the file you wish to upload to your bucket. 并且应该是一个字符串，所以 response.audioContent 不起作用。
bucket.upload() 的 documentation 建议 destination: destinationPath 是我们应该放置 Firebase 存储位置路径的地方。这是正确的吗？
我们如何从 Google Text-to-Speech (response.audioContent) 中获取音频文件并将其保存为 bucket.upload() 可以访问的字符串？或者我们应该用别的东西代替 bucket.upload()?
这是我们完整的云函数：
exports.Google_T2S = functions.firestore.document('Users/{userID}/Spanish/T2S_Request').onUpdate((change, context) => {
if (change.after.data().word != undefined) {
// Performs the Text-to-Speech request
async function test() {
try {
const word = change.after.data().word; // the text
const longLanguage = 'Spanish';
const audioFormat = '.mp3';
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const fs = require('fs');
const util = require('util');
const textToSpeech = require('@google-cloud/text-to-speech'); // Imports the Google Cloud client library
const client = new textToSpeech.TextToSpeechClient(); // Creates a client
let myWordFile = word.replace(/ /g,"_"); // replace spaces with underscores in the file name
myWordFile = myWordFile.toLowerCase(); // convert the file name to lower case
myWordFile = myWordFile + audioFormat; // append .mp3 to the file name;
// copied from https://cloud.google.com/blog/products/gcp/use-google-cloud-client-libraries-to-store-files-save-entities-and-log-data
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('myProject-cd99d.appspot.com');
const destinationPath = 'Audio/Spanish/' + myWordFile;
const request = { // Construct the request
input: {text: word},
// Select the language and SSML Voice Gender (optional)
voice: {languageCode: 'es-ES', ssmlGender: 'FEMALE'},
// Select the type of audio encoding
audioConfig: {audioEncoding: 'MP3'},
};
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
const writeFile = util.promisify(fs.writeFile);
await writeFile('output.mp3', response.audioContent, 'binary');
console.log('Audio content written to file: output.mp3')
// response.audioContent is the downloaded file
await bucket.upload(response.audioContent, {
destination: destinationPath
});
}
catch (error) {
console.error(error);
}
}
test();
} // close if
return 0; // prevents an error message "Function returned undefined, expected Promise or value"
});
file.save() 就是答案。 util.promisify 是不必要的，并且会导致有关 original 某些内容的错误消息。这是完成的云功能：
const functions = require('firebase-functions');
// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
//
// exports.helloWorld = functions.https.onRequest((request, response) => {
// response.send("Hello from Firebase!");
// });
async function textToSpeechRequest()
{
try
{
const word = change.after.data().word; // the text
const longLanguage = 'Spanish';
const audioFormat = '.mp3';
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const util = require('util');
const textToSpeech = require('@google-cloud/text-to-speech'); // Imports the Google Cloud client library
const client = new textToSpeech.TextToSpeechClient(); // Creates a client
let myWordFile = word.replace(/ /g,"_"); // replace spaces with underscores in the file name
myWordFile = myWordFile.toLowerCase(); // convert the file name to lower case
myWordFile = myWordFile + audioFormat; // append .mp3 to the file name;
// copied from https://cloud.google.com/blog/products/gcp/use-google-cloud-client-libraries-to-store-files-save-entities-and-log-data
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
//const bucket = storage.bucket('myProject-cd99d.appspot.com');
var file = bucket.file('Audio/Spanish/' + myWordFile);
const request = { // Construct the request
input: {text: word},
// Select the language and SSML Voice Gender (optional)
voice: {languageCode: 'es-ES', ssmlGender: 'FEMALE'},
// Select the type of audio encoding
audioConfig: {audioEncoding: 'MP3'},
};
const options = { // construct the file to write
metadata: {
contentType: 'audio/mpeg',
metadata: {
source: 'Google Text-to-Speech'
}
}
};
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
// response.audioContent is the downloaded file
return await file.save(response.audioContent, options)
.then(() => {
console.log("File written to Firebase Storage.")
return;
})
.catch((error) => {
console.error(error);
});
} // close try
catch (error) {
console.error(error);
} // close catch
} // close async function declaration
exports.Google_T2S = functions.firestore.document('Users/{userID}/Spanish/T2S_Request').onUpdate((change, context) => {
if (change.after.data().word !== undefined)
{
textToSpeechRequest();
} // close if
}); // close Google_T2S
我们遇到错误 TypeError: [ERR_INVALID_ARG_TYPE]: The "original" argument must be of type function at Object.promisify。此错误似乎不会影响云功能。
重申无效的内容，fs.createWriteStream 无效，因为 Google Cloud Functions 无法处理 Node file system commands. Instead, Google Cloud Functions have their own methods that wrap the Node file system commands. bucket.upload() will upload a local file to a bucket, but the path to the local file has to be a string, not a buffer or a stream coming from an API. file.save() 记录为
Write arbitrary data to a file.
This is a convenience method which wraps File#createWriteStream.
这就是我想要的！如果我的数据只有一件事，那就是任意的。又或者天生相反。之后我们只需要理顺 contentType（audio/mpeg，而不是 mp3）和文件路径。
我们正在尝试使用 Google 云函数从 Google Text-to-Speech 获取音频文件并将其保存到 Firebase 存储。 Google Text-to-Speech 的 documentation 展示了如何获取音频文件并将其保存在本地：
// Performs the Text-to-Speech request
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
const writeFile = util.promisify(fs.writeFile);
await writeFile('output.mp3', response.audioContent, 'binary');
console.log('Audio content written to file: output.mp3');
这会导致错误消息 Error: EROFS: read-only file system。 Google Cloud Storage 不允许在本地写入文件。
使用 Firebase 存储 bucket.upload() 有一些问题：
const destinationPath = 'Audio/Spanish' + filename.ogg;
// Performs the Text-to-Speech request
const [response] = await client.synthesizeSpeech(request);
// response.audioContent is the downloaded file
await bucket.upload(response.audioContent, {
destination: destinationPath
));
错误信息是TypeError: Path must be a string。 bucket.upload() 的第一个参数是 The fully qualified path to the file you wish to upload to your bucket. 并且应该是一个字符串，所以 response.audioContent 不起作用。
bucket.upload() 的 documentation 建议 destination: destinationPath 是我们应该放置 Firebase 存储位置路径的地方。这是正确的吗？
我们如何从 Google Text-to-Speech (response.audioContent) 中获取音频文件并将其保存为 bucket.upload() 可以访问的字符串？或者我们应该用别的东西代替 bucket.upload()?
这是我们完整的云函数：
exports.Google_T2S = functions.firestore.document('Users/{userID}/Spanish/T2S_Request').onUpdate((change, context) => {
if (change.after.data().word != undefined) {
// Performs the Text-to-Speech request
async function test() {
try {
const word = change.after.data().word; // the text
const longLanguage = 'Spanish';
const audioFormat = '.mp3';
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const fs = require('fs');
const util = require('util');
const textToSpeech = require('@google-cloud/text-to-speech'); // Imports the Google Cloud client library
const client = new textToSpeech.TextToSpeechClient(); // Creates a client
let myWordFile = word.replace(/ /g,"_"); // replace spaces with underscores in the file name
myWordFile = myWordFile.toLowerCase(); // convert the file name to lower case
myWordFile = myWordFile + audioFormat; // append .mp3 to the file name;
// copied from https://cloud.google.com/blog/products/gcp/use-google-cloud-client-libraries-to-store-files-save-entities-and-log-data
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('myProject-cd99d.appspot.com');
const destinationPath = 'Audio/Spanish/' + myWordFile;
const request = { // Construct the request
input: {text: word},
// Select the language and SSML Voice Gender (optional)
voice: {languageCode: 'es-ES', ssmlGender: 'FEMALE'},
// Select the type of audio encoding
audioConfig: {audioEncoding: 'MP3'},
};
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
const writeFile = util.promisify(fs.writeFile);
await writeFile('output.mp3', response.audioContent, 'binary');
console.log('Audio content written to file: output.mp3')
// response.audioContent is the downloaded file
await bucket.upload(response.audioContent, {
destination: destinationPath
});
}
catch (error) {
console.error(error);
}
}
test();
} // close if
return 0; // prevents an error message "Function returned undefined, expected Promise or value"
});
file.save() 就是答案。 util.promisify 是不必要的，并且会导致有关 original 某些内容的错误消息。这是完成的云功能：
const functions = require('firebase-functions');
// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
//
// exports.helloWorld = functions.https.onRequest((request, response) => {
// response.send("Hello from Firebase!");
// });
async function textToSpeechRequest()
{
try
{
const word = change.after.data().word; // the text
const longLanguage = 'Spanish';
const audioFormat = '.mp3';
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const util = require('util');
const textToSpeech = require('@google-cloud/text-to-speech'); // Imports the Google Cloud client library
const client = new textToSpeech.TextToSpeechClient(); // Creates a client
let myWordFile = word.replace(/ /g,"_"); // replace spaces with underscores in the file name
myWordFile = myWordFile.toLowerCase(); // convert the file name to lower case
myWordFile = myWordFile + audioFormat; // append .mp3 to the file name;
// copied from https://cloud.google.com/blog/products/gcp/use-google-cloud-client-libraries-to-store-files-save-entities-and-log-data
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
//const bucket = storage.bucket('myProject-cd99d.appspot.com');
var file = bucket.file('Audio/Spanish/' + myWordFile);
const request = { // Construct the request
input: {text: word},
// Select the language and SSML Voice Gender (optional)
voice: {languageCode: 'es-ES', ssmlGender: 'FEMALE'},
// Select the type of audio encoding
audioConfig: {audioEncoding: 'MP3'},
};
const options = { // construct the file to write
metadata: {
contentType: 'audio/mpeg',
metadata: {
source: 'Google Text-to-Speech'
}
}
};
// copied from https://cloud.google.com/text-to-speech/docs/quickstart-client-libraries#client-libraries-usage-nodejs
const [response] = await client.synthesizeSpeech(request);
// Write the binary audio content to a local file
// response.audioContent is the downloaded file
return await file.save(response.audioContent, options)
.then(() => {
console.log("File written to Firebase Storage.")
return;
})
.catch((error) => {
console.error(error);
});
} // close try
catch (error) {
console.error(error);
} // close catch
} // close async function declaration
exports.Google_T2S = functions.firestore.document('Users/{userID}/Spanish/T2S_Request').onUpdate((change, context) => {
if (change.after.data().word !== undefined)
{
textToSpeechRequest();
} // close if
}); // close Google_T2S
我们遇到错误 TypeError: [ERR_INVALID_ARG_TYPE]: The "original" argument must be of type function at Object.promisify。此错误似乎不会影响云功能。
重申无效的内容，fs.createWriteStream 无效，因为 Google Cloud Functions 无法处理 Node file system commands. Instead, Google Cloud Functions have their own methods that wrap the Node file system commands. bucket.upload() will upload a local file to a bucket, but the path to the local file has to be a string, not a buffer or a stream coming from an API. file.save() 记录为
Write arbitrary data to a file.
This is a convenience method which wraps
File#createWriteStream.
这就是我想要的！如果我的数据只有一件事，那就是任意的。又或者天生相反。之后我们只需要理顺 contentType（audio/mpeg，而不是 mp3）和文件路径。