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async support #106

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28102db
Futures implementation
May 9, 2019
404c7b1
lifetime hell
May 9, 2019
41989d7
Future powered
May 10, 2019
c9f88ea
Now also the lambda itsel can be a Future
May 10, 2019
2b9b4df
pub use tokio
May 12, 2019
20f5601
Remove commented-out code, rename I into Fut
May 21, 2019
61016c6
added an explicit future example
May 23, 2019
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1,197 changes: 0 additions & 1,197 deletions Cargo.lock
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0 lambda-http/examples/basic.rs → lambda-http/examples/http.rs
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2 changes: 1 addition & 1 deletion lambda-http/src/ext.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ pub enum PayloadError {
/// }
///
/// fn main() {
/// lambda!(handler)
/// lambda!(handler);
/// }
///
/// fn handler(
Expand Down
45 changes: 27 additions & 18 deletions lambda-http/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
//! use lambda_runtime::{Context, error::HandlerError};
//!
//! fn main() {
//! lambda!(hello)
//! lambda!(hello);
//! }
//!
//! fn hello(
Expand Down Expand Up @@ -49,7 +49,7 @@
//! .unwrap_or_else(|| "stranger")
//! )
//! )
//! )
//! );
//! }
//! ```

Expand All @@ -58,9 +58,13 @@
#[macro_use]
extern crate maplit;

pub use tokio;

pub use http::{self, Response};

use lambda_runtime::{self as lambda, error::HandlerError, Context};
use tokio::runtime::Runtime as TokioRuntime;

use tokio::prelude::future::{Future, IntoFuture};

mod body;
mod ext;
Expand All @@ -75,16 +79,19 @@ use crate::{request::LambdaRequest, response::LambdaResponse};
pub type Request = http::Request<Body>;

/// Functions serving as ALB and API Gateway handlers must conform to this type.
pub trait Handler<R> {
pub trait Handler<Ret, Fut>: Send
where Fut: IntoFuture<Item=Ret, Error=HandlerError> {
/// Run the handler.
fn run(&mut self, event: Request, ctx: Context) -> Result<R, HandlerError>;
fn run(&mut self, event: Request, ctx: Context) -> Fut;
}

impl<F, R> Handler<R> for F
impl<Fun, Ret, Fut> Handler<Ret, Fut> for Fun
where
F: FnMut(Request, Context) -> Result<R, HandlerError>,
Fun: FnMut(Request, Context) -> Fut + Send,
Fut: IntoFuture<Item=Ret, Error=HandlerError> + Send,
Fut::Future: Send + 'static,
{
fn run(&mut self, event: Request, ctx: Context) -> Result<R, HandlerError> {
fn run(&mut self, event: Request, ctx: Context) -> Fut {
(*self)(event, ctx)
}
}
Expand All @@ -97,35 +104,37 @@ where
///
/// # Panics
/// The function panics if the Lambda environment variables are not set.
pub fn start<R>(f: impl Handler<R>, runtime: Option<TokioRuntime>)
pub fn start<Ret, Fut>(f: impl Handler<Ret, Fut>) -> impl Future<Item=(), Error=()>
where
R: IntoResponse,
Ret: IntoResponse,
Fut: IntoFuture<Item=Ret, Error=HandlerError> + Send,
Fut::Future: Send + 'static,
{
// handler requires a mutable ref
let mut func = f;
lambda::start(
|req: LambdaRequest<'_>, ctx: Context| {
move |req: LambdaRequest<'_>, ctx: Context| {
let is_alb = req.request_context.is_alb();
func.run(req.into(), ctx)
.map(|resp| LambdaResponse::from_response(is_alb, resp.into_response()))
func.run(req.into(), ctx).into_future()
.map(move |resp| LambdaResponse::from_response(is_alb, resp.into_response()))
},
runtime,
// runtime,
)
}

/// A macro for starting new handler's poll for API Gateway and ALB events
#[macro_export]
macro_rules! lambda {
($handler:expr) => {
$crate::start($handler, None)
$crate::tokio::run($crate::start($handler))
};
($handler:expr, $runtime:expr) => {
$crate::start($handler, Some($runtime))
$runtime.spawn($crate::start($handler))
};
($handler:ident) => {
$crate::start($handler, None)
$crate::tokio::run($crate::start($handler))
};
($handler:ident, $runtime:expr) => {
$crate::start($handler, Some($runtime))
$runtime.spawn($crate::start($handler))
};
}
3 changes: 2 additions & 1 deletion lambda-runtime-client/Cargo.toml
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Expand Up @@ -27,4 +27,5 @@ lambda_runtime_errors = { path = "../lambda-runtime-errors", version = "^0.1" }
failure = "^0.1"

[dev-dependencies]
chrono = "^0.4"
chrono = "^0.4"
lambda_runtime_errors_derive = { path = "../lambda-runtime-errors-derive", version = "^0.1" }
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