103 lines
3.7 KiB
Rust
103 lines
3.7 KiB
Rust
use std::sync::Arc;
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use boitalettres::proto::{Request, Response};
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use boitalettres::errors::Error as BalError;
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use imap_codec::types::command::CommandBody;
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use tokio::sync::{oneshot,mpsc};
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use tokio::sync::mpsc::error::TrySendError;
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use futures::future::BoxFuture;
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use futures::future::FutureExt;
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use crate::command;
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use crate::login::Credentials;
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use crate::mailstore::Mailstore;
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use crate::mailbox::Mailbox;
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/* This constant configures backpressure in the system,
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* or more specifically, how many pipelined messages are allowed
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* before refusing them
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*/
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const MAX_PIPELINED_COMMANDS: usize = 10;
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struct Message {
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req: Request,
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tx: oneshot::Sender<Response>,
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}
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pub struct Manager {
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tx: mpsc::Sender<Message>,
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}
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//@FIXME we should garbage collect the Instance when the Manager is destroyed.
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impl Manager {
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pub fn new(mailstore: Arc<Mailstore>) -> Self {
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let (tx, mut rx) = mpsc::channel(MAX_PIPELINED_COMMANDS);
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tokio::spawn(async move {
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let mut instance = Instance::new(mailstore, rx);
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instance.start().await;
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});
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Self { tx }
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}
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pub fn process(&self, req: Request) -> BoxFuture<'static, Result<Response, BalError>> {
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let (tx, rx) = oneshot::channel();
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let msg = Message { req, tx };
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// We use try_send on a bounded channel to protect the daemons from DoS.
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// Pipelining requests in IMAP are a special case: they should not occure often
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// and in a limited number (like 3 requests). Someone filling the channel
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// will probably be malicious so we "rate limit" them.
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match self.tx.try_send(msg) {
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Ok(()) => (),
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Err(TrySendError::Full(_)) => return async { Response::bad("Too fast! Send less pipelined requests!") }.boxed(),
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Err(TrySendError::Closed(_)) => return async { Response::bad("The session task has exited") }.boxed(),
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};
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// @FIXME add a timeout, handle a session that fails.
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async {
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rx.await.or_else(|e| {
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tracing::warn!("Got error {:#?}", e);
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Response::bad("No response from the session handler")
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})
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}.boxed()
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}
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}
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pub struct Instance {
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rx: mpsc::Receiver<Message>,
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pub mailstore: Arc<Mailstore>,
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pub creds: Option<Credentials>,
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pub selected: Option<Mailbox>,
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}
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impl Instance {
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fn new(mailstore: Arc<Mailstore>, rx: mpsc::Receiver<Message>) -> Self {
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Self { mailstore, rx, creds: None, selected: None, }
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}
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//@FIXME add a function that compute the runner's name from its local info
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// to ease debug
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// fn name(&self) -> String { }
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async fn start(&mut self) {
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//@FIXME add more info about the runner
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tracing::debug!("starting runner");
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while let Some(msg) = self.rx.recv().await {
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let mut cmd = command::Command::new(msg.req.tag, self);
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let _ = match msg.req.body {
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CommandBody::Capability => cmd.capability().await,
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CommandBody::Login { username, password } => cmd.login(username, password).await,
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CommandBody::Lsub { reference, mailbox_wildcard } => cmd.lsub(reference, mailbox_wildcard).await,
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CommandBody::List { reference, mailbox_wildcard } => cmd.list(reference, mailbox_wildcard).await,
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CommandBody::Select { mailbox } => cmd.select(mailbox).await,
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CommandBody::Fetch { sequence_set, attributes, uid } => cmd.fetch(sequence_set, attributes, uid).await,
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_ => Response::bad("Error in IMAP command received by server."),
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};
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}
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//@FIXME add more info about the runner
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tracing::debug!("exiting runner");
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}
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}
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