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mod command;
mod flow;
mod session;
use std::task::{Context, Poll};
use anyhow::Result;
use boitalettres::errors::Error as BalError;
use boitalettres::proto::{Request, Response};
use boitalettres::server::accept::addr::AddrIncoming;
use boitalettres::server::accept::addr::AddrStream;
use boitalettres::server::Server as ImapServer;
use futures::future::BoxFuture;
use futures::future::FutureExt;
use tokio::sync::watch;
use tower::Service;
use crate::config::ImapConfig;
use crate::login::ArcLoginProvider;
/// Server is a thin wrapper to register our Services in BàL
pub struct Server(ImapServer<AddrIncoming, Instance>);
pub async fn new(config: ImapConfig, login: ArcLoginProvider) -> Result<Server> {
//@FIXME add a configuration parameter
let incoming = AddrIncoming::new(config.bind_addr).await?;
tracing::info!("IMAP activated, will listen on {:#}", incoming.local_addr);
let imap = ImapServer::new(incoming).serve(Instance::new(login.clone()));
Ok(Server(imap))
}
impl Server {
pub async fn run(self, mut must_exit: watch::Receiver<bool>) -> Result<()> {
tracing::info!("IMAP started!");
tokio::select! {
s = self.0 => s?,
_ = must_exit.changed() => tracing::info!("Stopped IMAP server"),
}
Ok(())
}
}
//---
/// Instance is the main Tokio Tower service that we register in BàL.
/// It receives new connection demands and spawn a dedicated service.
struct Instance {
login_provider: ArcLoginProvider,
}
impl Instance {
pub fn new(login_provider: ArcLoginProvider) -> Self {
Self { login_provider }
}
}
impl<'a> Service<&'a AddrStream> for Instance {
type Response = Connection;
type Error = anyhow::Error;
type Future = BoxFuture<'static, Result<Self::Response>>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, addr: &'a AddrStream) -> Self::Future {
tracing::info!(remote_addr = %addr.remote_addr, local_addr = %addr.local_addr, "accept");
let lp = self.login_provider.clone();
async { Ok(Connection::new(lp)) }.boxed()
}
}
//---
/// Connection is the per-connection Tokio Tower service we register in BàL.
/// It handles a single TCP connection, and thus has a business logic.
struct Connection {
session: session::Manager,
}
impl Connection {
pub fn new(login_provider: ArcLoginProvider) -> Self {
Self {
session: session::Manager::new(login_provider),
}
}
}
impl Service<Request> for Connection {
type Response = Response;
type Error = BalError;
type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request) -> Self::Future {
tracing::debug!("Got request: {:#?}", req);
self.session.process(req)
}
}
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