Javascript 带有ChildProcessError的Google云函数错误

这是我的云函数，它应该在每次上传图像时生成带水印的图像并将其存储在firebase存储中

exports.generateWatermark = functions.storage
  .object()
  .onFinalize(async object => {
    try {
      const fileBucket = object.bucket; // The Storage bucket that contains the file.
      const filePath = object.name; // File path in the bucket.
      const contentType = object.contentType; // File content type.
      const metageneration = object.metageneration; // Number of times metadata has been generated. New objects have a value of 1.

      // Exit if this is triggered on a file that is not an image.
      if (!contentType.startsWith('image/')) {
        return console.log('This is not an image.');
      }

      // Get the file name.
      const fileName = path.basename(filePath);
      // Exit if the image is already a watermarked image.
      if (fileName.startsWith('watermark_')) {
        return console.log('Already a Watermarked image.');
      }

      if (!filePath.startsWith('pets')) {
        return console.log('Not a pet image: ', filePath);
      }

      // Download file from bucket.
      const bucket = admin.storage().bucket(fileBucket);
      const tempFilePath = path.join(os.tmpdir(), fileName);
      const tempWatermarkPath = path.join(os.tmpdir(), 'watermark.png');
      const metadata = {
        contentType: contentType,
      };

      // Generate a watermarked image using Jimp
      await bucket.file(filePath).download({destination: tempFilePath});
      await bucket
        .file('logo/cbs.png')
        .download({destination: tempWatermarkPath});
      console.log('Image downloaded locally to', tempFilePath, filePath);

      await spawn('convert', [
        tempFilePath,
        '-gravity',
        'NorthWest',
        '-draw',
        `"image Over 10,10,200,200 ${tempWatermarkPath}"`,
        tempFilePath,
      ]);
      console.log('Watermarked image created at', tempFilePath);

      // We add a 'watermark_' prefix
      const watermarkFileName = `watermark_${fileName}`;
      const watermarkFilePath = path.join(
        path.dirname(filePath),
        watermarkFileName,
      );
      // Uploading the watermarked image.
      await bucket.upload(tempFilePath, {
        destination: watermarkFilePath,
        metadata: metadata,
      });

      // Once the watermarked image has been uploaded delete the local file to free up disk space.
      fs.unlinkSync(tempFilePath);
      return fs.unlinkSync(tempWatermarkPath);
    } catch (err) {
      console.log('GENERATE WATERMARK ERROR: ', err);
      throw err;
    }
  });

出错的代码部分是imagemagick部分：

  await spawn('convert', [
    tempFilePath,
    '-gravity',
    'NorthWest',
    '-draw',
    `"image Over 10,10,200,200 ${tempWatermarkPath}"`,
    tempFilePath,
  ]);

这是我得到的错误：

有没有办法让我得到更多关于错误的信息？错误甚至没有到达我的捕获块。

使用观察者模式

调用

childprocess.spawn

的返回值与stdout和stderr一起使用，它们是

eventemitter

在等待现有接口之前，您需要一个额外的步骤来提示它。比如说,

constspawn=（命令，参数）=>newpromise（（解析，拒绝）=>{
const cp=require（'child_process'）.spawn（命令，args）；
设err=null，out=null；
on（'data'，data=>out+=data.toString（））；
on（'error'，data=>err+=data.toString（））；
cp.on（'error'，data=>err+=data.toString（））；
cp.on（'close'，代码=>{
（代码===0）？解决（输出）：拒绝（错误）
});
})

另一方面，使用回调。这使得使用

util.promisify

函数很容易实现。比如说

const util=require（'util'）；
const execFile=util.promisify（require（'child_process'）.execFile）；
exports.generateWatermark=functions.storage
.object（）
.onFinalize（异步对象=>{
试一试{
//...
等待execFile（'convert'[
临时文件路径，
“-重力”，
"西北",，
“-绘制”，
`“超过10,10200200${tempWatermarkPath}的图像”`，
临时文件路径，
]);
//...
}捕捉（错误）{
log（'GENERATE WATERMARK ERROR:'，err）；
犯错误；
}
});