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Rust AWS Lambda Tutorial

This repository hosts the code for my Rust AWS Lambda Tutorial, using rust-aws-lambda and docker-lambda. It also includes a way of testing the function locally, so you don't have to provision an AWS Lambda Function to run your program, reducing the feedback loop.

Compiling

A specific Rust target must be installed, and it can be done as follows:

$ rustup target add x86_64-unknown-linux-musl

The musl-gcc package must also be installed. On Ubuntu, it would be done as follows:

$ apt-get install musl

After installing the target and musl-gcc, compiling is only a matter of executing the following command:

$ cargo build --target x86_64-unknown-linux-musl

In case you want to compile a release version, you must add the --release flag:

$ cargo build --target x86_64-unknown-linux-musl --release

Running

As mentioned above, this tutorial uses docker-lambda, specifically the Go image, as it allows running Rust binaries natively. In order to run our compiled program, we would do as follows:

$ docker run --rm -v "$PWD":/var/task lambci/lambda:go1.x <path-to-executable> <input-to-handler-function>

The <input-to-handler-function> argument is the content the handler function is expecting and can be anything. In this tutorial, we'll be using a JSON object, eg. {"some": "event"}.

Reading from stdin

It's possible to pipe the <input-to-handler-function> from another command. In order to achieve that, the following command must be used:

$ echo '{"some": "event"}' | docker run --rm -v "$PWD":/var/task -i -e DOCKER_LAMBDA_USE_STDIN=1 lambci/lambda:go1.x