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use std::sync::{Arc, Mutex};
use std::task::{Context, Poll};
use anyhow::Result;
use boitalettres::server::accept::addr::AddrStream;
use boitalettres::errors::Error as BalError;
use boitalettres::proto::{Request, Response};
use futures::future::BoxFuture;
use futures::future::FutureExt;
use imap_codec::types::command::CommandBody;
use tokio::sync::mpsc;
use tokio::sync::mpsc::error::TrySendError;
use tower::Service;
use crate::command;
use crate::login::Credentials;
use crate::mailstore::Mailstore;
use crate::mailbox::Mailbox;
const MAX_PIPELINED_COMMANDS: usize = 10;
pub struct Instance {
pub mailstore: Arc<Mailstore>,
}
impl Instance {
pub fn new(mailstore: Arc<Mailstore>) -> Self {
Self { mailstore }
}
}
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 ms = self.mailstore.clone();
Box::pin(async { Ok(Connection::new(ms)) })
}
}
pub struct Connection {
pub tx: mpsc::Sender<Request>,
}
impl Connection {
pub fn new(mailstore: Arc<Mailstore>) -> Self {
let (tx, mut rx) = mpsc::channel(MAX_PIPELINED_COMMANDS);
tokio::spawn(async move {
let mut session = Session::new(mailstore, rx);
session.run().await;
});
Self { tx }
}
}
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);
match self.tx.try_send(req) {
Ok(()) => return async { Response::ok("Ok") }.boxed(),
Err(TrySendError::Full(_)) => return async { Response::bad("Too fast! Send less pipelined requests!") }.boxed(),
Err(TrySendError::Closed(_)) => return async { Response::bad("The session task has exited") }.boxed(),
}
// send a future that await here later a oneshot command
}
}
pub struct Session {
pub mailstore: Arc<Mailstore>,
pub creds: Option<Credentials>,
pub selected: Option<Mailbox>,
rx: mpsc::Receiver<Request>,
}
impl Session {
pub fn new(mailstore: Arc<Mailstore>, rx: mpsc::Receiver<Request>) -> Self {
Self { mailstore, rx, creds: None, selected: None, }
}
pub async fn run(&mut self) {
while let Some(req) = self.rx.recv().await {
let mut cmd = command::Command::new(req.tag, self);
let _ = match req.body {
CommandBody::Capability => cmd.capability().await,
CommandBody::Login { username, password } => cmd.login(username, password).await,
CommandBody::Lsub { reference, mailbox_wildcard } => cmd.lsub(reference, mailbox_wildcard).await,
CommandBody::List { reference, mailbox_wildcard } => cmd.list(reference, mailbox_wildcard).await,
CommandBody::Select { mailbox } => cmd.select(mailbox).await,
CommandBody::Fetch { sequence_set, attributes, uid } => cmd.fetch(sequence_set, attributes, uid).await,
_ => Response::bad("Error in IMAP command received by server."),
};
}
}
}
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