warp_lambda

A super simple crate to let you use warp filters with aws lambda runtime

Example

Add warp_lambda, warp and tokio to your dependencies:

tokio = { version = "1.2.0", features = [ "full" ]}
warp = "0.3"
warp_lambda = "0.1"

And then get started in your main.rs:

use warp::Filter;

#[tokio::main]
async fn main() {
    // Your warp routes (filters)
    let routes = warp::any().map(|| "Hello, World!");
    // Convert them to a warp service (a tower service implmentation)
    // using `warp::service()`
    let warp_service = warp::service(routes);
    // The warp_lambda::run() function takes care of invoking the aws lambda runtime for you
    warp_lambda::run(warp_service)
        .await
        .expect("An error occured");
}

Deployment

Relevant parts copied over from https://github.com/awslabs/aws-lambda-rust-runtime

AWS CLI

To deploy the basic sample as a Lambda function using the AWS CLI, we first need to manually build it with cargo. Since Lambda uses Amazon Linux, you'll need to target your executable for an x86_64-unknown-linux-musl platform.

Run this script once to add the new target:

$ rustup target add x86_64-unknown-linux-musl

Compile one of the examples as a release with a specific target for deployment to AWS:

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

For a custom runtime, AWS Lambda looks for an executable called bootstrap in the deployment package zip. Rename the generated basic executable to bootstrap and add it to a zip archive.

$ cp ./target/release/examples/hello ./bootstrap && zip lambda.zip bootstrap && rm bootstrap

Now that we have a deployment package (lambda.zip), we can use the AWS CLI to create a new Lambda function. Make sure to replace the execution role with an existing role in your account!

$ aws lambda create-function --function-name rustTest \
  --handler doesnt.matter \
  --zip-file fileb://./lambda.zip \
  --runtime provided \
  --role arn:aws:iam::XXXXXXXXXXXXX:role/your_lambda_execution_role \
  --environment Variables={RUST_BACKTRACE=1} \
  --tracing-config Mode=Active

Note: --cli-binary-format raw-in-base64-out is a required argument when using the AWS CLI version 2. More Information

Docker

Alternatively, you can build a Rust-based Lambda function in a docker mirror of the AWS Lambda provided runtime with the Rust toolchain preinstalled.

Running the following command will start a ephemeral docker container which will build your Rust application and produce a zip file containing its binary auto-renamed to bootstrap to meet the AWS Lambda's expectations for binaries under target/lambda/release/{your-binary-name}.zip, typically this is just the name of your crate if you are using the cargo default binary (i.e. main.rs)

# build and package deploy-ready artifact
$ docker run --rm \
    -v ${PWD}:/code \
    -v ${HOME}/.cargo/registry:/root/.cargo/registry \
    -v ${HOME}/.cargo/git:/root/.cargo/git \
    softprops/lambda-rust

Supported Lambda HTTP Trigger events

• API Gateway (REST API and HTTP API)
• Application Load Balancer

Recommended to use API Gateway with HTTP API with following parameters.

API Type: HTTP
Method: ANY
Resource Path: /{proxy+}

License

MIT