Question

我按照Firecast中的Firebase功能教程：https://www.youtube.com/watch?v=pDLpEn3PbmE&t=338s在上传图片时使用firebase创建缩略图。

这一切都运行良好，但是当我上传用iPhone拍摄的图像时，它会被旋转（垂直图像会水平保存）。所以我做了一些关于这方面的研究，我从ImageMagick（http://magick.imagemagick.org/script/command-line-options.php#auto-orient）

中看到了-auto-orient参数

但我不确定如何将此参数添加到spawn函数以将此参数考虑在内

我的工作代码（只是相关部分）没有-auto-orient

...
return bucket.file(filePath).download({
        destination: tempFilePath
    })
    .then(() => {
        console.log('Image downloaded locally to', tempFilePath);
        return spawn('convert', [tempFilePath, '-thumbnail', '200x200>', tempFilePath]);
    })
    .then(() => {
        console.log('Thumbnail created!');
        const thumbFilePath = filePath.replace(/(\/)?([^\/]*)$/, '$1thumb_$2');
        console.log(`thumbFilePath: ${thumbFilePath}`);
        return bucket.upload(tempFilePath, {
            destination: thumbFilePath
        });
    }) 
...

我尝试使用-auto-orient参数

的代码

...
return bucket.file(filePath).download({
        destination: tempFilePath
    })
    .then(() => {
        console.log('Image downloaded locally to', tempFilePath);
        return spawn('convert', ['-auto-orient', tempFilePath, '-thumbnail', '200x200>', tempFilePath]);
    })
    .then(() => {
        console.log('Thumbnail created!');
        const thumbFilePath = filePath.replace(/(\/)?([^\/]*)$/, '$1thumb_$2');
        console.log(`thumbFilePath: ${thumbFilePath}`);
        return bucket.upload(tempFilePath, {
            destination: thumbFilePath
        });
    })
...

但是，当我将此部署到firebase并尝试上传图像时，我收到以下错误消息，该消息并未向我提供有关其无法正常工作的大量信息

Function execution took 6227 ms, finished with status: 'connection error'

任何想法？

Answer 1

我也遇到了＃34;连接错误＆＃34; GCF内部的消息。我做了3件事来解决它，虽然我不完全确定是否只有1是原因或者它是全部3.它们是：

未解决的承诺
缺乏使用GCF提供的callback()功能
使用require('child-process-promise').exec代替require('child-process-promise').spawn

这是我的代码，现在已经运行了2次/秒，持续12小时，而没有遇到＆＃34;连接错误＆＃34;消息。

const Storage = require('@google-cloud/storage');
const exec    = require('child-process-promise').exec;
const uuidv1  = require('uuid/v1');
const _       = require('lodash');

exports.processFile = (event, callback) => {
    const file         = event.data;

    if(file.contentType.indexOf('image/') !== 0) {
        console.log(file.name + ' is not an image');
        callback();
    } else if(!_.isUndefined(file.metadata) && !_.isUndefined(file.metadata['x-processed'])) {
        console.log(file.name + ' was already processed');
        callback();
    } else if(file.resourceState === 'not_exists') {
        console.log('This is a deletion event.');
        callback();
    } else if (file.resourceState === 'exists' && file.metageneration > 1) {
        console.log('This is a metadata change event.');
        callback();
    } else {
        const storage       = new Storage();
        const bucket        = storage.bucket(file.bucket);
        const parts         = file.name.split('.');
        const tempFilePath  = '/tmp/' + uuidv1() + '.' + _.last(parts);
        const tempFinalPath = '/tmp/' + uuidv1() + '.' + _.last(parts);

        console.log('Processing file: ' + file.name);

        return bucket.file(file.name).download({
            destination: tempFilePath
        })
        .then(() => {
            console.log('Image downloaded locally to ', tempFilePath);

            return exec(`convert -auto-orient "${tempFilePath}" "${tempFinalPath}"`)
        })
        .then(() => {
            console.log('uploading modified file to ' + file.name);

            return bucket.upload(tempFinalPath, {
                destination: file.name,
                contentType: file.contentType,
                metadata: {
                    metadata: {
                        "x-processed": "yes"
                    }
                }
            })
        })
        .then(() => {
            console.log('file uploaded successfully to ' + file.name);
            callback()
        })
        .catch((err) => {
            callback(err);
        })
    }
}

在Firebase函数

1 个答案: