GCS生成缩略图云功能错误

Question

我有一个应用程序，我想为上传到存储器的每个图像生成缩略图。我试图使用生成缩略图云功能，但当图像上传到存储时，云功能会在firebase中的日志中出错。

TypeError: gcs(...).bucket is not a function
at exports.generateThumbnail.functions.storage.object.onFinalize (/user_code/index.js:77:73)
at cloudFunctionNewSignature (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:105:23)
at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:135:20)
at /var/tmp/worker/worker.js:768:24
at process._tickDomainCallback (internal/process/next_tick.js:135:7)

这是我的index.js文件。此处仅添加GCS要求。

const functions = require("firebase-functions");
const gcs = require("@google-cloud/storage");
admin.initializeApp();
const THUMB_MAX_HEIGHT = 200;
const THUMB_MAX_WIDTH = 200;
// Thumbnail prefix added to file names.
const THUMB_PREFIX = 'thumb_';
exports.generateThumbnail = functions.storage.object().onFinalize((object) => {
// File and directory paths.
const filePath = object.name;
const contentType = object.contentType; // This is the image MIME type
const fileDir = path.dirname(filePath);
const fileName = path.basename(filePath);
const thumbFilePath = path.normalize(path.join(fileDir, `${THUMB_PREFIX}${fileName}`));
const tempLocalFile = path.join(os.tmpdir(), filePath);
const tempLocalDir = path.dirname(tempLocalFile);
const tempLocalThumbFile = path.join(os.tmpdir(), thumbFilePath);
// Exit if this is triggered on a file that is not an image.
if (!contentType.startsWith('image/')) {
console.log('This is not an image.');
return null;
}
// Exit if the image is already a thumbnail.
if (fileName.startsWith(THUMB_PREFIX)) {
console.log('Already a Thumbnail.');
return null;
}
// Cloud Storage files.
const bucket = gcs({keyFilename: 'service-account-credentials.json'}).bucket(object.bucket);
const file = bucket.file(filePath);
const thumbFile = bucket.file(thumbFilePath);
const metadata = {
contentType: contentType,
// To enable Client-side caching you can set the Cache-Control headers here. Uncomment below.
// 'Cache-Control': 'public,max-age=3600',
};
// Create the temp directory where the storage file will be downloaded.
return mkdirp(tempLocalDir).then(() => {
// Download file from bucket.
return file.download({destination: tempLocalFile});
}).then(() => {
console.log('The file has been downloaded to', tempLocalFile);
// Generate a thumbnail using ImageMagick.
return spawn('convert', [tempLocalFile, '-thumbnail', `${THUMB_MAX_WIDTH}x${THUMB_MAX_HEIGHT}>`, tempLocalThumbFile], {capture: ['stdout', 'stderr']});
}).then(() => {
console.log('Thumbnail created at', tempLocalThumbFile);
// Uploading the Thumbnail.
return bucket.upload(tempLocalThumbFile, {destination: thumbFilePath, metadata: metadata});
}).then(() => {
console.log('Thumbnail uploaded to Storage at', thumbFilePath);
// Once the image has been uploaded delete the local files to free up disk space.
fs.unlinkSync(tempLocalFile);
fs.unlinkSync(tempLocalThumbFile);
// Get the Signed URLs for the thumbnail and original image.
const config = {
action: 'read',
expires: '03-01-2500',
};
return Promise.all([
thumbFile.getSignedUrl(config),
file.getSignedUrl(config),
]);
}).then((results) => {
console.log('Got Signed URLs.');
const thumbResult = results[0];
const originalResult = results[1];
const thumbFileUrl = thumbResult[0];
const fileUrl = originalResult[0];
console.log('Got Signed URLs. '+ thumbFileUrl);
return result;
}).then(() => console.log('Thumbnail URLs saved to database.'));
});

无法理解问题出在哪里！。

我根据答案的建议进行了更改

require(...) is not a function
at Object.<anonymous> (D:mercury_twomercuryfunctionsindex.js:20:45)
at Module._compile (internal/modules/cjs/loader.js:678:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:689:10)
at Module.load (internal/modules/cjs/loader.js:589:32)
at tryModuleLoad (internal/modules/cjs/loader.js:528:12)
at Function.Module._load (internal/modules/cjs/loader.js:520:3)
at Module.require (internal/modules/cjs/loader.js:626:17)
at require (internal/modules/cjs/helpers.js:20:18)
at C:UsersHarshaAppDataRoamingnpmnode_modulesfirebase-toolslibtriggerParser.js:15:15
at Object.<anonymous> (C:UsersHarshaAppDataRoamingnpmnode_modulesfirebase-toolslibtriggerParser.js:53:3)

然后我甚至无法部署该功能firebase deploy引发以上错误。

Answer 1

您不应该执行

const bucket = gcs({keyFilename: 'service-account-credentials.json'}).bucket(object.bucket);

但只有

const bucket = gcs.bucket(object.bucket);

只有当您需要云功能顶部的gcs模块时，才需要使用service-account-credentials.json(即服务帐户密钥JSON文件(，如下所示：

const gcs = require('@google-cloud/storage')({keyFilename: 'service-account-credentials.json});

请参阅官方Firebase示例，该示例详细显示：https://github.com/firebase/functions-samples/blob/master/generate-thumbnail/functions/index.js