1 files changed, 100 insertions, 0 deletions
diff --git a/src/imap/mod.rs b/src/imap/mod.rs
new file mode 100644
index 0000000..45480ce
--- /dev/null
+++ b/src/imap/mod.rs
@@ -0,0 +1,100 @@
+mod session;
+mod flow;
+mod command;
+
+use std::sync::Arc;
+use std::task::{Context, Poll};
+
+use anyhow::Result;
+use boitalettres::errors::Error as BalError;
+use boitalettres::proto::{Request, Response};
+use boitalettres::server::accept::addr::AddrStream;
+use boitalettres::server::Server as ImapServer;
+use futures::future::BoxFuture;
+use futures::future::FutureExt;
+use tower::Service;
+
+use crate::LoginProvider;
+
+/// Server is a thin wrapper to register our Services in BàL
+pub struct Server(ImapServer<AddrIncoming, service::Instance>);
+pub async fn new(
+    config: ImapConfig,
+    login: Arc<dyn LoginProvider + Send + Sync>,
+) -> Result<Server> {
+
+    //@FIXME add a configuration parameter
+    let incoming = AddrIncoming::new(config.bind_addr).await?;
+    let imap = ImapServer::new(incoming).serve(service::Instance::new(login.clone()));
+
+    tracing::info!("IMAP activated, will listen on {:#}", self.imap.incoming.local_addr);
+    Server(imap)
+}
+impl Server {
+    pub async fn run(&self, mut must_exit: watch::Receiver<bool>) -> Result<()> {
+        tracing::info!("IMAP started!");
+        tokio::select! {
+            s = self => 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: Arc<dyn LoginProvider + Send + Sync>,
+}
+impl Instance {
+    pub fn new(login_provider: Arc<dyn LoginProvider + Send + Sync>) -> 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: Arc<dyn LoginProvider + Send + Sync>) -> 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)
+    }
+}