Tide Lambda listener example

A little example serverless application, that you can deploy with the sam cli, using Rust as a custom runtime and building with Tide and tide-lambda-listener and using a PostgreSQL database to store the greetings.

You check this post for a nice list of free-tier offerings for a pg db.

db schema:

CREATE TABLE "public"."tide-lambda-example-greetings" (
    "name" text NOT NULL,
    "created_at" timestamp with time zone,
    "modified_at" timestamp with time zone,
    PRIMARY KEY ("name")
);

To build and deploy your application for the first time, you will need first to complete the DB_URL in the template.yml file with your database url and then run the following in your shell:

sam build
sam deploy --guided

This will deploy two lambda functions:

PostHello

Save your greeting into the db

    $ curl -X POST -d '{"name":"joe"}'  https://<id>.execute-api.us-east-2.amazonaws.com/Prod/hello

    Hello joe, welcome to this tide lambda example.

GettHello

Retrive your greeting

curl  https://<id>.execute-api.us-east-2.amazonaws.com/Prod/hello/joe
Hi again joe

Custom build

SAM allow us to build each funcntion using a makefile, we are using this file to file also to set the file to use in our build.rs file allowing to only compile the needed function endpoint and inject it into the main function of our application.

This is an exploration and could be more efficient ways to conditional compile the code.

Compile to AWS lambda

You will need to target x86_64-unknown-linux-musl, you can check this article about custom runtimes.