Struct lambda_runtime::Runtime

pub struct Runtime<S> { /* private fields */ }

Lambda runtime executing a handler function on incoming requests.

Middleware can be added to a runtime using the Runtime::layer method in order to execute logic prior to processing the incoming request and/or after the response has been sent back to the Lambda Runtime API.

Example

use lambda_runtime::{Error, LambdaEvent, Runtime};
use serde_json::Value;
use tower::service_fn;

#[tokio::main]
async fn main() -> Result<(), Error> {
    let func = service_fn(func);
    Runtime::new(func).run().await?;
    Ok(())
}

async fn func(event: LambdaEvent<Value>) -> Result<Value, Error> {
    Ok(event.payload)
}

Implementations

impl<'a, F, EventPayload, Response, BufferedResponse, StreamingResponse, StreamItem, StreamError> Runtime<RuntimeApiClientService<RuntimeApiResponseService<CatchPanicService<'a, F>, EventPayload, Response, BufferedResponse, StreamingResponse, StreamItem, StreamError>>>

where F: Service<LambdaEvent<EventPayload>, Response = Response>, F::Future: Future<Output = Result<Response, F::Error>>, F::Error: Into<Diagnostic<'a>> + Debug, EventPayload: for<'de> Deserialize<'de>, Response: IntoFunctionResponse<BufferedResponse, StreamingResponse>, BufferedResponse: Serialize, StreamingResponse: Stream<Item = Result<StreamItem, StreamError>> + Unpin + Send + 'static, StreamItem: Into<Bytes> + Send, StreamError: Into<BoxError> + Send + Debug,

pub fn new(handler: F) -> Self

Create a new runtime that executes the provided handler for incoming requests.

In order to start the runtime and poll for events on the Lambda Runtime APIs, you must call Runtime::run.

Note that manually creating a Runtime does not add tracing to the executed handler as is done by super::run. If you want to add the default tracing functionality, call Runtime::layer with a super::layers::TracingLayer.

impl<S> Runtime<S>

pub fn layer<L>(self, layer: L) -> Runtime<L::Service>

where L: Layer<S>, L::Service: Service<LambdaInvocation, Response = (), Error = BoxError>,

Add a new layer to this runtime. For an incoming request, this layer will be executed before any layer that has been added prior.

Example

use lambda_runtime::{layers, Error, LambdaEvent, Runtime};
use serde_json::Value;
use tower::service_fn;

#[tokio::main]
async fn main() -> Result<(), Error> {
    let runtime = Runtime::new(service_fn(echo)).layer(
        layers::TracingLayer::new()
    );
    runtime.run().await?;
    Ok(())
}

async fn echo(event: LambdaEvent<Value>) -> Result<Value, Error> {
    Ok(event.payload)
}

impl<S> Runtime<S>

where S: Service<LambdaInvocation, Response = (), Error = BoxError>,

pub async fn run(self) -> Result<(), BoxError>

Start the runtime and begin polling for events on the Lambda Runtime API.