GitHub - awslabs/aws-lambda-rust-runtime: A Rust runtime for AWS Lambda
source link: https://github.com/awslabs/aws-lambda-rust-runtime
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
README.md
Rust Runtime for AWS Lambda
This package makes it easy to run AWS Lambda Functions written in Rust. This workspace includes two crates:
lambda-runtime-client
is a client SDK for the Lambda Runtime APIs. You probably don't need to use this crate directly!lambda-runtime
is a library that makes it easy to write Lambda functions in Rust.
Example function
The code below creates a simple function that receives an event with a greeting
and name
field and returns a GreetingResponse
message for the given name and greeting. Notice: to run these examples, we require a minimum Rust version of 1.30.
extern crate lambda_runtime as lambda; extern crate serde_derive; extern crate log; extern crate simple_logger; use serde_derive::{Serialize, Deserialize}; use lambda::{lambda, Context, error::HandlerError}; use log::error; use std::error::Error; #[derive(Serialize, Deserialize)] struct GreetingEvent { greeting: String, name: String, } #[derive(Serialize, Deserialize)] struct GreetingResponse { message: String, } fn main() -> Result<(), Box<dyn Error>> { simple_logger::init_with_level(log::Level::Debug).unwrap(); lambda!(my_handler); Ok(()) } fn my_handler(event: GreetingEvent, ctx: Context) -> Result<GreetingResponse, HandlerError> { if event.name == "" { error!("Empty name in request {}", ctx.aws_request_id); return Err(ctx.new_error("Empty name")); } Ok(GreetingResponse { message: format!("{}, {}!", event.greeting, event.name), }) }
The code above is the same as the basic example in the lambda-runtime
crate. To deploy the basic sample as a Lambda function, we first build it with cargo
. Since Lambda uses Amazon Linux, you'll need to target your executable for an x86_64-linux
platform.
$ cargo build -p lambda_runtime --example basic --release
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/basic ./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 file://./rust.zip \ --runtime provided \ --role arn:aws:iam::XXXXXXXXXXXXX:role/your_lambda_execution_role \ --environment Variables={RUST_BACKTRACE=1} \ --tracing-config Mode=Active
You can now test the function using the AWS CLI or the AWS Lambda console
$ aws lambda invoke --function-name rustTest \ --payload '{"firstName": "world"}' \ output.json $ cat output.json # Prints: {"message":"Hello, world!"}
lambda-runtime-client
Defines the RuntimeClient
trait and provides its HttpRuntimeClient
implementation. The client fetches events and returns output as Vec<u8>
.
For error reporting to the runtime APIs the library defines the RuntimeApiError
trait and the ErrorResponse
object. Custom errors for the APIs should implement the to_response() -> ErrorResponse
method of the RuntimeApiError
trait.
lambda-runtime
This library makes it easy to create Rust executables for AWS lambda. The library defines a lambda!()
macro. Call the lambda!()
macro from your main method with a function that matches the Handler
type:
pub type Handler<E, O> = fn(E, Context) -> Result<O, error::HandlerError>;
Optionally, you can pass your own instance of Tokio runtime to the lambda!()
macro. See our with_custom_runtime.rs
example
Custom event objects
To serialize and deserialize events and responses, we suggest using the use the serde
library. To receive custom events, annotate your structure with Serde's macros:
extern crate serde; extern crate serde_derive; extern crate serde_json; use serde_derive::{Serialize, Deserialize}; use serde_json::json; use std::error::Error; #[derive(Serialize, Deserialize)] pub struct NewIceCreamEvent { pub flavors: Vec<String>, } #[derive(Serialize, Deserialize)] pub struct NewIceCreamResponse { pub flavors_added_count: usize, } fn main() -> Result<(), Box<Error>> { let flavors = json!({ "flavors": [ "Nocciola", "抹茶", "आम" ] }); let event: NewIceCreamEvent = serde_json::from_value(flavors)?; let response = NewIceCreamResponse { flavors_added_count: event.flavors.len(), }; serde_json::to_string(&response)?; Ok(()) }
Recommend
About Joyk
Aggregate valuable and interesting links.
Joyk means Joy of geeK