Question

我正在尝试使用Google云端功能示例中的缩略图代码。但是，我不断收到以下内容作为回复。

        { code: 1, message: '`convert /tmp/users/ZSE7ZRkFGKZq0Bc3tESEG2uT8922/images/1489813436054.jpg -thumbnail 500x500> -limit memory 32MB /tmp/users/ZSE7ZRkFGKZq0Bc3tESEG2uT8922/images/thumbnail/thumb_1489813436054.jpg` failed with code 1',
  childProcess: 
   ChildProcess {
     domain: null,
     _events: { error: [Function: t], close: [Function] },
     _eventsCount: 2,
     _maxListeners: undefined,
     _closesNeeded: 3,
     _closesGot: 3,
     connected: false,
     signalCode: null,
     exitCode: 1,
     killed: false,
     spawnfile: 'convert',
     _handle: null,
     spawnargs: 
      [ 'convert',
        '/tmp/users/ZSE7ZRkFGKZq0Bc3tESEG2uT8922/images/1489813436054.jpg',
        '-thumbnail',
        '500x500>',
        '-limit',
        'memory 32MB',
        '/tmp/users/ZSE7ZRkFGKZq0Bc3tESEG2uT8922/images/thumbnail/thumb_1489813436054.jpg' ],
     pid: 14,
     stdin: 
      Socket {
        connecting: false,
        _hadError: false,
        _handle: null,
        _parent: null,
        _host: null,
        _readableState: [Object],
        readable: false,
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _writableState: [Object],
        writable: false,
        allowHalfOpen: false,
        destroyed: true,
        _bytesDispatched: 0,
        _sockname: null,
        _writev: null,
        _pendingData: null,
        _pendingEncoding: '',
        server: null,
        _server: null,
        write: [Function: writeAfterFIN],
        _idleNext: null,
        _idlePrev: null,
        _idleTimeout: -1 },
     stdout: 
      Socket {
        connecting: false,
        _hadError: false,
        _handle: null,
        _parent: null,
        _host: null,
        _readableState: [Object],
        readable: false,
        domain: null,
        _events: [Object],
        _eventsCount: 3,
        _maxListeners: undefined,
        _writableState: [Object],
        writable: false,
        allowHalfOpen: false,
        destroyed: true,
        _bytesDispatched: 0,
        _sockname: null,
        _writev: null,
        _pendingData: null,
        _pendingEncoding: '',
        server: null,
        _server: null,
        _idleNext: null,
        _idlePrev: null,
        _idleTimeout: -1,
        write: [Function: writeAfterFIN] },
     stderr: 
      Socket {
        connecting: false,
        _hadError: false,
        _handle: null,
        _parent: null,
        _host: null,
        _readableState: [Object],
        readable: false,
        domain: null,
        _events: [Object],
        _eventsCount: 3,
        _maxListeners: undefined,
        _writableState: [Object],
        writable: false,
        allowHalfOpen: false,
        destroyed: true,
        _bytesDispatched: 0,
        _sockname: null,
        _writev: null,
        _pendingData: null,
        _pendingEncoding: '',
        server: null,
        _server: null,
        read: [Function],
        _consuming: true,
        _idleNext: null,
        _idlePrev: null,
        _idleTimeout: -1,
        write: [Function: writeAfterFIN] },
     stdio: [ [Object], [Object], [Object] ] },
  toString: [Function: toString] }

我的代码......

'use strict';

const functions = require('firebase-functions');
const mkdirp = require('mkdirp-promise');
const gcs = require('@google-cloud/storage')();
const spawn = require('child-process-promise').spawn;
const LOCAL_TMP_FOLDER = '/tmp/';

// Max height and width of the thumbnail in pixels.
const THUMB_MAX_HEIGHT = 500;
const THUMB_MAX_WIDTH = 500;
// Thumbnail prefix added to file names.
const THUMB_PREFIX = 'thumb_';
const uploadDir = 'thumbnail/'; // Not a great var name...

/**
 * When an image is uploaded in the Storage bucket We generate a thumbnail automatically using
 * ImageMagick.
 */
exports.generateThumbnail = functions.storage.object().onChange(event => {
  const filePath = event.data.name;
  const filePathSplit = filePath.split('/');
  const fileName = filePathSplit.pop();
  const fileDir = filePathSplit.join('/') + (filePathSplit.length > 0 ? '/' : '');
  const thumbFilePath = `${fileDir}${uploadDir}${THUMB_PREFIX}${fileName}`;
  const tempLocalDir = `${LOCAL_TMP_FOLDER}${fileDir}`;
  const tempLocalFile = `${tempLocalDir}${fileName}`;
  const tempLocalThumbFile = `${LOCAL_TMP_FOLDER}${thumbFilePath}`;

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

  // Exit if the image is already a thumbnail.
  if (fileName.startsWith(THUMB_PREFIX)) {
    console.log('Already a Thumbnail.');
    return;
  }

  // Exit if this is a move or deletion event.
  if (event.data.resourceState === 'not_exists') {
    console.log('This is a deletion event.');
    return;
  }

  // Create the temp directory where the storage file will be downloaded.
  return mkdirp(tempLocalDir).then(() => {
    // Download file from bucket.
    const bucket = gcs.bucket(event.data.bucket);
    return bucket.file(filePath).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}>`, '-limit', 'memory 32MB', '-debug', 'all', tempLocalThumbFile]).then(() => {
        console.log('Thumbnail created at', tempLocalThumbFile);
        // Uploading the Thumbnail.
        return bucket.upload(tempLocalThumbFile, {
          destination: thumbFilePath
        }).then(() => {
          console.log('Thumbnail uploaded to Storage at', thumbFilePath);
        });
      });
    });
  });
});

我尝试了一些不同的配置，但似乎没有任何效果。有点不知所措。

图像：

Answer 1

除了增加对云功能的内存限制外，还应该在云功能完成之前删除临时文件。请观看有关以下主题的最新Firebase官方视频：https://www.youtube.com/watch?v=2mjfI0FYP7Y

写入临时文件位置的文件计入您的云功能的内存使用量。

功能完成后，不会自动清除临时文件。只要服务器实例存在，文件将一直保留。因此，无论您在配置中分配了多少内存，频繁触发的云功能都可能导致服务器实例的内存不足。

在文件顶部，添加对节点文件系统模块的要求

const fs = require('fs');

然后，在完成文件上传后，您将删除本地文件。

return bucket.upload(tempLocalThumbFile, { destination: thumbFilePath })
  .then(() => {
    console.log('Thumbnail uploaded to Storage at', thumbFilePath);
    fs.unlinkSync(tempLocalThumbFile);
  });

功能被杀死。错误：超出内存限制[缩略图示例]

1 个答案: