Aws lambda sample code for download a s3 file

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Related This should launch a simple wizard allowing you to specify your language of choice and some security settings. Expand the dropdown that says Change default execution role and select the Create a new role from AWS policy templates option. Give your role a name and select the policy template with the name Amazon S3 object read-only permissions.

You can leave everything else as default. This policy will give your Lambda function the permission to read your source object orders.

The steps our Lambda function logic should take are:. A couple things to note here. The outputRoute and outputToken are two required parameters that you must send back to S3 as part of our final write operation. I like to think of these as scoped identifiers that tell S3 which GET request the corresponding transformation operation is matched to. Next, we want to drop in our code. Go ahead and click on Deploy to activate your newly written code in your lambda function.

Head back over to the S3 section of the console and click on Object Lambda Access Point in the left hand side bar as seen below. In the prompt, first give your object lambda a name. Second, enter the ARN of the access point you created in Step 1.

Alternatively, you can use the Browse S3 button use the wizard to select it. Under the Lambda section, select the function that you previously created. Mine was called ObjectLambda-JustPurchases. You can skip through all the rest of the options and click on Create Object Lambda Access Point at the bottom of the wizard. You can access CloudShell either by searching for it through the top AWS searchbar, or by clicking the obscure terminal looking icon in the top menu bar, right next to the search box, as imaged below.

Once the terminal loads, we run the following CLI command to attempt to retrieve our transformed S3 object. A feature such as S3 Object Lambda caters to a certain use case that tends to crop up fairly often in the world of application development. I think this feature is great to know about for certain use cases and was pretty easy to set up. The reason we needed to set up an access point prior to using this feature is beyond me, but other than that the experience was positive.