Lambda function doesn't execute till the end

Question

Im invoking a lambda function to compress images uploaded to a bucket and then write the compressed image to another bucket

The code executes fine it fetches the image but for some reason it fails to write the compressed image to the new bucket

Here is my code:


//Import compress module
const imagemin = require('imagemin');
const imageminMozjpeg = require('imagemin-mozjpeg');
const sharp = require('sharp');

const AWS = require('aws-sdk')

const s3 = new AWS.S3()
exports.handler = async (event) =>{
    // TODO implement
    
    const srcBucket = event.Records[0].s3.bucket.name;
    
    const srcKey    = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, " "));
    const dstBucket = "safarni";
    const dstKey    =  srcKey;
    
    console.log(srcKey, dstBucket, dstKey)
     // Download the image from the S3 source bucket. 
    try {
        const params = {
            Bucket: srcBucket,
            Key: srcKey
        };
        var origimage = await s3.getObject(params).promise();

    } catch (error) {

        console.log('here');
        return;
    }  
    
    const jpgBuffer = await sharp(origimage.Body).jpeg().toBuffer()
    
    //Compressing the photo
    const compressedjpgBuffer = await imagemin.buffer(jpgBuffer, {
            plugins: [imageminMozjpeg({ quality: 85 })]
    })
       
    console.log(compressedjpgBuffer)    
    // Upload the thumbnail image to the destination bucket
    try {
        const destparams = {
            Bucket: dstBucket,
            Key: dstKey,
            Body: compressedjpgBuffer,    
        };

        const putResult = await s3.putObject(destparams).promise(); 
        
    } catch (error) {
        console.log(error);
        return;
    } 
        
    console.log('Successfully resized ' + srcBucket + '/' + srcKey +
        ' and uploaded to ' + dstBucket + '/' + dstKey); 
    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    };
    return response;
};

This is an image of the log

Did your function timeout, does increasing timeout allow it to complete? — Chris Williams
– Chris Williams, Commented Jul 18, 2020 at 9:45

Chris Williams · Accepted Answer · 2020-07-18 09:52:37Z

1

You function is timing out from this log you provided. Perform one (or both the below options)

Increase the timeout past the 3 seconds (this is the default value). It can be increased upto 15 minutes, you should aim to set the timeout to match the expected time it should take to perform the action.
Increase (Memory/CPU allocation).

Either of these can be changed in the console by clicking Edit above the basic settings section, then modifying to the appropriate values as shown below.

Once the timeout is exceeded the function will fail to continue.

edited Jul 18, 2020 at 9:52

answered Jul 18, 2020 at 9:45

Chris Williams

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Comments

atomNULL · Accepted Answer · 2020-07-18 10:10:37Z

Try to change your code like this:

const imagemin = require('imagemin');
const imageminMozjpeg = require('imagemin-mozjpeg');
const sharp = require('sharp');
const AWS = require("aws-sdk");

const s3 = new AWS.S3();

exports.handler = async (event) => {
  const s3MetaData = event.Records[0].s3;
  const srcBucket = s3MetaData.bucket.name;
  const srcKey = s3MetaData.object.key;

  const dstBucket = "safarni";
  const dstKey = `compressed_${srcKey}`;

  try {
    const srcParams = {
      Bucket: srcBucket,
      Key: srcKey
    };

    const origImage = await s3.getObject(srcParams).promise();

    const jpgBuffer = await sharp(origImage.Body).jpeg().toBuffer();

    const compressedJPGBuffer = await imagemin.buffer(jpgBuffer, 
      { plugins: [imageminMozjpeg({ quality: 85 })] });

    const destParams = {
      Bucket: dstBucket,
      Key: dstKey,
      Body: compressedJPGBuffer
    }

    const newImage = await s3.putObject(destParams).promise();

    return {
      statusCode: 200,
      body: "Lambda successfully executed"
    }

  } catch (err) {
    console.error(`The following error occurred: ${err.message}`);
    throw err;
  }
}

Make sure you have the following policy applied:

- Action:
  - s3:putObject
  - s3:getObject
Effect: Allow
Resource:
  Fn::Join:
    - ""
    - - "arn:aws:s3:::"
      - Ref: YourBucket
        - /*

And also increase the timeout because apparently it is timing out after 3 seconds.

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