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我正在尝试从我的 firebase 函数中的谷歌云存储桶中读取图像，并使用如下的尖锐库提取其中的一部分


const bucket = admin.storage().bucket('XXX.appspot.com')
const filePath = '1558520481853'

   const pipeline = sharp().extract({ left: 0, top: 0, width: 30, height: 30 }).toBuffer().then( 
       (data:any) => 
                    console.log("data is::::" + data)
   );

    bucket.file(filePath).createReadStream().pipe(pipeline);

这失败并出现错误

TypeError: dest.on is not a function
    at DestroyableTransform.Readable.pipe (/srv/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:590:8)
    at Object.<anonymous> (/srv/lib/index.js:49:46)
    at Generator.next (<anonymous>)
    at /srv/lib/index.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/srv/lib/index.js:3:12)
    at exports.extract_text_from_bounding_box.functions.https.onRequest (/srv/lib/index.js:39:82)
    at cloudFunction (/srv/node_modules/firebase-functions/lib/providers/https.js:49:9)
    at /worker/worker.js:783:7
    at /worker/worker.js:766:11
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickDomainCallback (internal/process/next_tick.js:219:9)

我正在关注示例https://github.com/firebase/functions-samples/blob/master/image-sharp/functions/index.js，它正在写回我不需要的存储桶，只需要提取图像的base64

4

1 回答 1

1

错误在于“管道”方法。

在这条线上：

 bucket.file(filePath).createReadStream().pipe(pipeline);

尝试这个：

 bucket.file(filePath).createReadStream().pipe(pipeline());
于 2019-08-07T09:25:49.087 回答