'Learn How to Use Lambda Layers by Building an Image Resize Function Using Sharp' awslambda lambda
4.) Now let’s publish the Layer. Run the following command to create and publish the Layer: aws lambda publish-layer-version --layer-name sharp --description "Sharp dependency for image transformation" --zip-file fileb://nodejs.
zip --compatible-runtimes "nodejs14.x" --region "us-east-1" --output "json"Please note the{ "Content": { "Location": "https://prod-04-2014-layers.s3.us-east-1.amazonaws.com/snapshots/400803493251/sharp-539dd937-e29c-4418-bb52-2089f3945afc?versionId=4AMhQSZjY3uw3WI85Jcbf7j7Wj1x1X9i&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEJz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJHMEUCIQDu5lMXWxGc7ydyD6HbmtJk2tnqLLxfRbCYqP7tAwi8wAIgAt3KpyhdECs9I7a2mSGNPjk1n4fq1BKjA7iOmBxOquUq%2BgMIRBAAGgw3NDk2Nzg5MDI4MzkiDOj9vGzyeEXkicvNUirXA9YvAlIvZPE3WdpgIYp51YCl28ISR4eL93paFfqBC0IguHOz%2BctOG2P5MwSc2Vj10UVBUBE4qTiGXYTbB3Gk4jCzTvgDEN90fXdMqQYWXCd8zDpq6OIcZ59qVTQPIFdjo2JZ8U3Tfu68BkIynFNLIiX4Y2WvBqxpJoFUlrmOcU4%2FtuXhSmiW6E7xyQus%2F%2BTq3A2n7JaJ2XgKOKPyINyOOBD3ZsonHjiZw0Djtjk7IgvwMjWVLb6Gn73c%2BG9bLKsHHW7aUnRaNEYSdhWejPpz1QEUlcOKpAkLI87kAgTMPCsljZMujUgWxozAth76hWebjXoE7OHUFx870jscKhpMH2DfJhaOCOsmyme69jpqc4%2FEN6jT2WGjIG42xlfUnxB90DpNBjkPguXFyghOHFlhR07bp9Rom0oW1XOriN9jnbxSZqyQsqDFwbrua4oKtOcJJrzDnUGmhKAlWPMkwE81wDyxXSB%2BGYlYQb%2F%2BXScqvqsieBtIpN5KOfAlB0VuoN17gi5BFXsP5ePaGeJPZ5MJ9COQtm6nXdvclUc8ENc0xPfw0l0485%2BVWe%2BzME%2FIIB0Sclg8TuyNSNcqrSxVxb7VVZMZfFrmMpXpU2FD1chXDGTv1tOP3x%2BthjDLvtWSBjqlATnNWnlBoAfJJE7C6ZqVOgRZU4EvDCpLchTmHT%2F99LoBvqYUU0qospR1VT4pGKtfBBEuNGgg9%2F8Dkj6l0q7p62mlxwt%2BENpVp2QOczzj6CDCjMg1E6jnsVGNzCoPeYiEEx8q6LBM51EOMcm2sSSVjNeVNRhTFrF84ch%2FCteFF5Ilr%2FTHW7pb9pJCaOOuJ%2FMZIpXy2w9CtOXxbO8%2BkG4kHHDarz8M9w%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20220412T121324Z&X-Amz-SignedHeaders=host&X-Amz-Expires=600&X-Amz-Credential=ASIA25DCYHY3S4VTGYGI%2F20220412%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=d84c5f4e44cf6473e0a924f3a5fd57aea32c00b17480af1551a869e41693b030", "CodeSha256": "f9IchJrdt01ftKIlcSZ25z6ZRbf780hO8xVYCd6Uxhs=", "CodeSize": 8748397 }, "LayerArn": "arn:aws:lambda:us-east-1:400803493251:layer:sharp", "LayerVersionArn": "arn:aws:lambda:us-east-1:400803493251:layer:sharp:1", "Description": "Sharp dependency for image transformation", "CreatedDate": "2022-04-12T12:13:27.990+0000", "Version": 4, "CompatibleRuntimes": [ "nodejs14.x" ] }Lambda Layer. As discussed earlier, this Lambda function will be invoked when an object is created in the source bucket. Then it will create the respective thumbnail image and store it in the target bucket. The code example below assumes that you are following the S3 bucket name convention that is mentioned in Step-1.// dependencies const AWS=require; const util=require; const sharp=require; // get reference to S3 client const s3=new AWS.S3; exports.handler=async =>{ // Read options from the event parameter. console.log); const srcBucket=event.Records[0].s3.bucket.name; // Object key may have spaces or unicode non-ASCII characters. const srcKey =decodeURIComponent); const dstBucket=srcBucket + "-resized"; const dstKey ="resized-" + srcKey; // Infer the image type from the file suffix. const typeMatch=srcKey.match$/); if { console.log; return; } // Check that the image type is supported const imageType=typeMatch[1].toLowerCase; if { console.log; return; } // Download the image from the S3 source bucket. try { const params={ Bucket: srcBucket, Key: srcKey }; var origimage=await s3.getObject.promise; } catch { console.log; return; } // set thumbnail width. Resize will set the height automatically to maintain aspect ratio. const width=200; // Use the sharp module to resize the image and save in a buffer. try { var buffer=await sharp.resize.toBuffer; } catch { console.log; return; } // Upload the thumbnail image to the destination bucket try { const destparams={ Bucket: dstBucket, Key: dstKey, Body: buffer, ContentType: "image" }; const putResult=await s3.putObject.promise; } catch { console.log; return; } console.log; };containing your Lambda function code and its dependencies.index.js
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