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use std::convert::Infallible;
use hyper::{Body, Request, Response, Server};
use tedge_api::{
plugin::{HandleTypes, PluginExt},
Address, CoreMessages, Plugin, PluginBuilder, PluginDirectory, PluginError,
};
use tokio::task::JoinHandle;
use tokio_util::sync::CancellationToken;
use tracing::{debug, error, Instrument};
#[derive(serde::Deserialize, Debug, tedge_api::Config)]
struct HttpStopConfig {
/// The address to listen on
bind: std::net::SocketAddr,
}
#[derive(Debug, miette::Diagnostic, thiserror::Error)]
enum Error {
#[error("Failed to parse configuration")]
ConfigParseFailed(#[from] toml::de::Error),
#[error("HTTP Server stop failed")]
FailedToStopMainloop(#[from] tokio::task::JoinError),
}
pub struct HttpStopPluginBuilder;
#[async_trait::async_trait]
impl<PD> PluginBuilder<PD> for HttpStopPluginBuilder
where
PD: PluginDirectory,
{
fn kind_name() -> &'static str
where
Self: Sized,
{
"httpstop"
}
fn kind_configuration() -> Option<tedge_api::ConfigDescription> {
Some(<HttpStopConfig as tedge_api::AsConfig>::as_config())
}
fn kind_message_types() -> HandleTypes
where
Self: Sized,
{
HttpStopPlugin::get_handled_types()
}
async fn verify_configuration(
&self,
config: &tedge_api::PluginConfiguration,
) -> Result<(), tedge_api::PluginError> {
debug!("Verifying HttpStopPlugin configuration");
config
.clone()
.try_into::<HttpStopConfig>()
.map(|_| ())
.map_err(Error::from)
.map_err(PluginError::from)
}
async fn instantiate(
&self,
config: tedge_api::PluginConfiguration,
cancellation_token: tokio_util::sync::CancellationToken,
plugin_dir: &PD,
) -> Result<tedge_api::plugin::BuiltPlugin, tedge_api::PluginError> {
debug!("Instantiating HttpStopPlugin");
let config = config
.clone()
.try_into::<HttpStopConfig>()
.map_err(Error::from)?;
let plugin = HttpStopPlugin {
cancellation_token,
bind: config.bind,
core: plugin_dir.get_address_for_core(),
join_handle: None,
};
Ok(plugin.finish())
}
}
#[derive(Debug)]
pub struct HttpStopPlugin {
cancellation_token: CancellationToken,
bind: std::net::SocketAddr,
core: Address<CoreMessages>,
join_handle: Option<JoinHandle<Result<(), hyper::Error>>>,
}
impl tedge_api::plugin::PluginDeclaration for HttpStopPlugin {
type HandledMessages = ();
}
#[async_trait::async_trait]
impl Plugin for HttpStopPlugin {
#[tracing::instrument(name = "plugin.httpstop.start", skip(self))]
async fn start(&mut self) -> Result<(), PluginError> {
debug!("Setting up HttpStopPlugin");
let addr = self.core.clone();
let svc = hyper::service::make_service_fn(move |_conn| {
let addr = addr.clone();
let service = hyper::service::service_fn(move |req| request_handler(addr.clone(), req));
async move { Ok::<_, Infallible>(service) }
});
let cancellation_token = self.cancellation_token.clone();
let serv = Server::bind(&self.bind)
.serve(svc)
.with_graceful_shutdown(async move {
cancellation_token.cancelled().await;
});
self.join_handle = Some(tokio::spawn(
serv.instrument(tracing::debug_span!("plugin.httpstop.server")),
));
Ok(())
}
#[tracing::instrument(name = "plugin.httpstop.shutdown", skip(self))]
async fn shutdown(&mut self) -> Result<(), PluginError> {
debug!("Shutting down HttpStopPlugin");
if let Some(join_handle) = self.join_handle.take() {
let _ = join_handle
.instrument(tracing::debug_span!("plugin.httpstop.server.shutdown"))
.await
.map_err(Error::FailedToStopMainloop)?;
}
Ok(())
}
}
#[tracing::instrument(name = "plugin.httpstop.server.request_handler")]
async fn request_handler(
addr: Address<CoreMessages>,
_: Request<Body>,
) -> Result<Response<Body>, Infallible> {
debug!("Received request, stopping thin-edge now.");
let _ = addr.send_and_wait(tedge_api::message::StopCore).await;
Ok(Response::new("shutdown initiated".into()))
}
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