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WIP refactor idle

This commit is contained in:
Quentin 2024-01-17 08:22:15 +01:00
parent 55e26d24a0
commit 3d23f0c936
Signed by: quentin
GPG Key ID: E9602264D639FF68
7 changed files with 245 additions and 110 deletions
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4
src/imap/command/authenticated.rs
View File

@ -453,7 +453,7 @@ impl<'a> AuthenticatedContext<'a> {
.code(Code::ReadWrite)
.set_body(data)
.ok()?,
flow::Transition::Select(mb),
flow::Transition::Select(mb, flow::MailboxPerm::ReadWrite),
))
}
@ -491,7 +491,7 @@ impl<'a> AuthenticatedContext<'a> {
.code(Code::ReadOnly)
.set_body(data)
.ok()?,
flow::Transition::Examine(mb),
flow::Transition::Select(mb, flow::MailboxPerm::ReadOnly),
))
}

52
src/imap/command/selected.rs
View File

@ -25,6 +25,7 @@ pub struct SelectedContext<'a> {
pub mailbox: &'a mut MailboxView,
pub server_capabilities: &'a ServerCapability,
pub client_capabilities: &'a mut ClientCapability,
pub perm: &'a flow::MailboxPerm,
}
pub async fn dispatch<'a>(
@ -39,7 +40,10 @@ pub async fn dispatch<'a>(
CommandBody::Logout => anystate::logout(),
// Specific to this state (7 commands + NOOP)
CommandBody::Close => ctx.close().await,
CommandBody::Close => match ctx.perm {
flow::MailboxPerm::ReadWrite => ctx.close().await,
flow::MailboxPerm::ReadOnly => ctx.examine_close().await,
},
CommandBody::Noop | CommandBody::Check => ctx.noop().await,
CommandBody::Fetch {
sequence_set,
@ -75,6 +79,11 @@ pub async fn dispatch<'a>(
// UNSELECT extension (rfc3691)
CommandBody::Unselect => ctx.unselect().await,
// IDLE extension (rfc2177)
CommandBody::Idle => {
unimplemented!()
}
// In selected mode, we fallback to authenticated when needed
_ => {
authenticated::dispatch(authenticated::AuthenticatedContext {
@ -102,6 +111,18 @@ impl<'a> SelectedContext<'a> {
))
}
/// CLOSE in examined state is not the same as in selected state
/// (in selected state it also does an EXPUNGE, here it doesn't)
async fn examine_close(self) -> Result<(Response<'static>, flow::Transition)> {
Ok((
Response::build()
.to_req(self.req)
.message("CLOSE completed")
.ok()?,
flow::Transition::Unselect,
))
}
async fn unselect(self) -> Result<(Response<'static>, flow::Transition)> {
Ok((
Response::build()
@ -189,6 +210,10 @@ impl<'a> SelectedContext<'a> {
}
async fn expunge(self) -> Result<(Response<'static>, flow::Transition)> {
if let Some(failed) = self.fail_read_only() {
return Ok((failed, flow::Transition::None))
}
let tag = self.req.tag.clone();
let data = self.mailbox.expunge().await?;
@ -211,6 +236,10 @@ impl<'a> SelectedContext<'a> {
modifiers: &[StoreModifier],
uid: &bool,
) -> Result<(Response<'static>, flow::Transition)> {
if let Some(failed) = self.fail_read_only() {
return Ok((failed, flow::Transition::None))
}
let mut unchanged_since: Option<NonZeroU64> = None;
modifiers.iter().for_each(|m| match m {
StoreModifier::UnchangedSince(val) => {
@ -251,6 +280,11 @@ impl<'a> SelectedContext<'a> {
mailbox: &MailboxCodec<'a>,
uid: &bool,
) -> Result<(Response<'static>, flow::Transition)> {
//@FIXME Could copy be valid in EXAMINE mode?
if let Some(failed) = self.fail_read_only() {
return Ok((failed, flow::Transition::None))
}
let name: &str = MailboxName(mailbox).try_into()?;
let mb_opt = self.user.open_mailbox(&name).await?;
@ -303,6 +337,10 @@ impl<'a> SelectedContext<'a> {
mailbox: &MailboxCodec<'a>,
uid: &bool,
) -> Result<(Response<'static>, flow::Transition)> {
if let Some(failed) = self.fail_read_only() {
return Ok((failed, flow::Transition::None))
}
let name: &str = MailboxName(mailbox).try_into()?;
let mb_opt = self.user.open_mailbox(&name).await?;
@ -350,4 +388,16 @@ impl<'a> SelectedContext<'a> {
flow::Transition::None,
))
}
fn fail_read_only(&self) -> Option<Response<'static>> {
match self.perm {
flow::MailboxPerm::ReadWrite => None,
flow::MailboxPerm::ReadOnly => {
Some(Response::build()
.to_req(self.req)
.message("Write command are forbidden while exmining mailbox")
.no().unwrap())
},
}
}
}

36
src/imap/flow.rs
View File

@ -19,17 +19,23 @@ impl StdError for Error {}
pub enum State {
NotAuthenticated,
Authenticated(Arc<User>),
Selected(Arc<User>, MailboxView),
// Examined is like Selected, but indicates that the mailbox is read-only
Examined(Arc<User>, MailboxView),
Selected(Arc<User>, MailboxView, MailboxPerm),
Idle(Arc<User>, MailboxView, MailboxPerm),
Logout,
}
#[derive(Clone)]
pub enum MailboxPerm {
ReadOnly,
ReadWrite,
}
pub enum Transition {
None,
Authenticate(Arc<User>),
Examine(MailboxView),
Select(MailboxView),
Select(MailboxView, MailboxPerm),
Idle,
UnIdle,
Unselect,
Logout,
}
@ -38,20 +44,22 @@ pub enum Transition {
// https://datatracker.ietf.org/doc/html/rfc3501#page-13
impl State {
pub fn apply(&mut self, tr: Transition) -> Result<(), Error> {
let new_state = match (&self, tr) {
let new_state = match (std::mem::replace(self, State::NotAuthenticated), tr) {
(_s, Transition::None) => return Ok(()),
(State::NotAuthenticated, Transition::Authenticate(u)) => State::Authenticated(u),
(
State::Authenticated(u) | State::Selected(u, _) | State::Examined(u, _),
Transition::Select(m),
) => State::Selected(u.clone(), m),
(
State::Authenticated(u) | State::Selected(u, _) | State::Examined(u, _),
Transition::Examine(m),
) => State::Examined(u.clone(), m),
(State::Selected(u, _) | State::Examined(u, _), Transition::Unselect) => {
State::Authenticated(u) | State::Selected(u, _, _),
Transition::Select(m, p),
) => State::Selected(u, m, p),
(State::Selected(u, _, _) , Transition::Unselect) => {
State::Authenticated(u.clone())
}
(State::Selected(u, m, p), Transition::Idle) => {
State::Idle(u, m, p)
},
(State::Idle(u, m, p), Transition::UnIdle) => {
State::Selected(u, m, p)
},
(_, Transition::Logout) => State::Logout,
_ => return Err(Error::ForbiddenTransition),
};

201
src/imap/mod.rs
View File

@ -8,22 +8,28 @@ mod index;
mod mail_view;
mod mailbox_view;
mod mime_view;
mod request;
mod response;
mod search;
mod session;
use std::net::SocketAddr;
use anyhow::Result;
use anyhow::{Result, bail};
use futures::stream::{FuturesUnordered, StreamExt};
use tokio::net::TcpListener;
use tokio::sync::watch;
use tokio::sync::mpsc;
use imap_codec::imap_types::{core::Text, response::Greeting};
use imap_flow::server::{ServerFlow, ServerFlowEvent, ServerFlowOptions};
use imap_flow::stream::AnyStream;
use imap_codec::imap_types::response::{Code, Response, CommandContinuationRequest, Status};
use crate::imap::response::{Body, ResponseOrIdle};
use crate::imap::session::Instance;
use crate::imap::request::Request;
use crate::config::ImapConfig;
use crate::imap::capability::ServerCapability;
use crate::login::ArcLoginProvider;
@ -35,8 +41,8 @@ pub struct Server {
capabilities: ServerCapability,
}
#[derive(Clone)]
struct ClientContext {
stream: AnyStream,
addr: SocketAddr,
login_provider: ArcLoginProvider,
must_exit: watch::Receiver<bool>,
@ -74,13 +80,12 @@ impl Server {
tracing::info!("IMAP: accepted connection from {}", remote_addr);
let client = ClientContext {
stream: AnyStream::new(socket),
addr: remote_addr.clone(),
login_provider: self.login_provider.clone(),
must_exit: must_exit.clone(),
server_capabilities: self.capabilities.clone(),
};
let conn = tokio::spawn(client_wrapper(client));
let conn = tokio::spawn(NetLoop::handler(client, AnyStream::new(socket)));
connections.push(conn);
}
drop(tcp);
@ -92,46 +97,74 @@ impl Server {
}
}
async fn client_wrapper(ctx: ClientContext) {
let addr = ctx.addr.clone();
match client(ctx).await {
Ok(()) => {
tracing::debug!("closing successful session for {:?}", addr);
}
Err(e) => {
tracing::error!("closing errored session for {:?}: {}", addr, e);
}
}
use tokio::sync::mpsc::*;
enum LoopMode {
Quit,
Interactive,
IdleUntil(tokio::sync::Notify),
}
async fn client(mut ctx: ClientContext) -> Result<()> {
// Send greeting
let (mut server, _) = ServerFlow::send_greeting(
ctx.stream,
ServerFlowOptions {
crlf_relaxed: false,
literal_accept_text: Text::unvalidated("OK"),
literal_reject_text: Text::unvalidated("Literal rejected"),
..ServerFlowOptions::default()
},
Greeting::ok(
Some(Code::Capability(ctx.server_capabilities.to_vec())),
"Aerogramme",
)
.unwrap(),
)
.await?;
struct NetLoop {
ctx: ClientContext,
server: ServerFlow,
cmd_tx: Sender<Request>,
resp_rx: UnboundedReceiver<ResponseOrIdle>,
}
use crate::imap::response::{Body, Response as MyResponse};
use crate::imap::session::Instance;
use imap_codec::imap_types::command::Command;
use imap_codec::imap_types::response::{Code, Response, Status};
impl NetLoop {
async fn handler(ctx: ClientContext, sock: AnyStream) {
let addr = ctx.addr.clone();
use tokio::sync::mpsc;
let (cmd_tx, mut cmd_rx) = mpsc::channel::<Command<'static>>(10);
let (resp_tx, mut resp_rx) = mpsc::unbounded_channel::<MyResponse<'static>>();
let nl = match Self::new(ctx, sock).await {
Ok(nl) => {
tracing::debug!(addr=?addr, "netloop successfully initialized");
nl
},
Err(e) => {
tracing::error!(addr=?addr, err=?e, "netloop can not be initialized, closing session");
return
}
};
let bckgrnd = tokio::spawn(async move {
match nl.core().await {
Ok(()) => {
tracing::debug!("closing successful netloop core for {:?}", addr);
}
Err(e) => {
tracing::error!("closing errored netloop core for {:?}: {}", addr, e);
}
}
}
async fn new(mut ctx: ClientContext, sock: AnyStream) -> Result<Self> {
// Send greeting
let (mut server, _) = ServerFlow::send_greeting(
sock,
ServerFlowOptions {
crlf_relaxed: false,
literal_accept_text: Text::unvalidated("OK"),
literal_reject_text: Text::unvalidated("Literal rejected"),
..ServerFlowOptions::default()
},
Greeting::ok(
Some(Code::Capability(ctx.server_capabilities.to_vec())),
"Aerogramme",
)
.unwrap(),
)
.await?;
// Start a mailbox session in background
let (cmd_tx, mut cmd_rx) = mpsc::channel::<Request>(3);
let (resp_tx, mut resp_rx) = mpsc::unbounded_channel::<ResponseOrIdle>();
tokio::spawn(Self::session(ctx.clone(), cmd_rx, resp_tx));
// Return the object
Ok(NetLoop { ctx, server, cmd_tx, resp_rx })
}
/// Coms with the background session
async fn session(ctx: ClientContext, mut cmd_rx: Receiver<Request>, resp_tx: UnboundedSender<ResponseOrIdle>) -> () {
let mut session = Instance::new(ctx.login_provider, ctx.server_capabilities);
loop {
let cmd = match cmd_rx.recv().await {
@ -140,8 +173,8 @@ async fn client(mut ctx: ClientContext) -> Result<()> {
};
tracing::debug!(cmd=?cmd, sock=%ctx.addr, "command");
let maybe_response = session.command(cmd).await;
tracing::debug!(cmd=?maybe_response.completion, sock=%ctx.addr, "response");
let maybe_response = session.request(cmd).await;
tracing::debug!(cmd=?maybe_response, sock=%ctx.addr, "response");
match resp_tx.send(maybe_response) {
Err(_) => break,
@ -149,67 +182,81 @@ async fn client(mut ctx: ClientContext) -> Result<()> {
};
}
tracing::info!("runner is quitting");
});
}
// Main loop
loop {
async fn core(mut self) -> Result<()> {
let mut mode = LoopMode::Interactive;
loop {
mode = match mode {
LoopMode::Interactive => self.interactive_mode().await?,
LoopMode::IdleUntil(notif) => self.idle_mode(notif).await?,
LoopMode::Quit => break,
}
}
Ok(())
}
async fn interactive_mode(&mut self) -> Result<LoopMode> {
tokio::select! {
// Managing imap_flow stuff
srv_evt = server.progress() => match srv_evt? {
srv_evt = self.server.progress() => match srv_evt? {
ServerFlowEvent::ResponseSent { handle: _handle, response } => {
match response {
Response::Status(Status::Bye(_)) => break,
_ => tracing::trace!("sent to {} content {:?}", ctx.addr, response),
Response::Status(Status::Bye(_)) => return Ok(LoopMode::Quit),
_ => tracing::trace!("sent to {} content {:?}", self.ctx.addr, response),
}
},
ServerFlowEvent::CommandReceived { command } => {
match cmd_tx.try_send(command) {
match self.cmd_tx.try_send(Request::ImapCommand(command)) {
Ok(_) => (),
Err(mpsc::error::TrySendError::Full(_)) => {
server.enqueue_status(Status::bye(None, "Too fast").unwrap());
tracing::error!("client {:?} is sending commands too fast, closing.", ctx.addr);
self.server.enqueue_status(Status::bye(None, "Too fast").unwrap());
tracing::error!("client {:?} is sending commands too fast, closing.", self.ctx.addr);
}
_ => {
server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
tracing::error!("session task exited for {:?}, quitting", ctx.addr);
self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
}
}
},
flow => {
server.enqueue_status(Status::bye(None, "Unsupported server flow event").unwrap());
tracing::error!("session task exited for {:?} due to unsupported flow {:?}", ctx.addr, flow);
self.server.enqueue_status(Status::bye(None, "Unsupported server flow event").unwrap());
tracing::error!("session task exited for {:?} due to unsupported flow {:?}", self.ctx.addr, flow);
}
},
// Managing response generated by Aerogramme
maybe_msg = resp_rx.recv() => {
let response = match maybe_msg {
None => {
server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
tracing::error!("session task exited for {:?}, quitting", ctx.addr);
continue
},
Some(r) => r,
};
for body_elem in response.body.into_iter() {
let _handle = match body_elem {
Body::Data(d) => server.enqueue_data(d),
Body::Status(s) => server.enqueue_status(s),
};
}
server.enqueue_status(response.completion);
maybe_msg = self.resp_rx.recv() => match maybe_msg {
Some(ResponseOrIdle::Response(response)) => {
for body_elem in response.body.into_iter() {
let _handle = match body_elem {
Body::Data(d) => self.server.enqueue_data(d),
Body::Status(s) => self.server.enqueue_status(s),
};
}
self.server.enqueue_status(response.completion);
},
Some(ResponseOrIdle::Idle) => {
let cr = CommandContinuationRequest::basic(None, "idling")?;
self.server.enqueue_continuation(cr);
return Ok(LoopMode::IdleUntil(tokio::sync::Notify::new()))
},
None => {
self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
},
},
// When receiving a CTRL+C
_ = ctx.must_exit.changed() => {
server.enqueue_status(Status::bye(None, "Server is being shutdown").unwrap());
_ = self.ctx.must_exit.changed() => {
self.server.enqueue_status(Status::bye(None, "Server is being shutdown").unwrap());
},
};
Ok(LoopMode::Interactive)
}
drop(cmd_tx);
bckgrnd.await?;
Ok(())
async fn idle_mode(&mut self, notif: tokio::sync::Notify) -> Result<LoopMode> {
Ok(LoopMode::IdleUntil(notif))
}
}

8
src/imap/request.rs Normal file
View File

@ -0,0 +1,8 @@
use imap_codec::imap_types::command::Command;
use tokio::sync::Notify;
#[derive(Debug)]
pub enum Request {
ImapCommand(Command<'static>),
IdleUntil(Notify),
}

8
src/imap/response.rs
View File

@ -3,6 +3,7 @@ use imap_codec::imap_types::command::Command;
use imap_codec::imap_types::core::Tag;
use imap_codec::imap_types::response::{Code, Data, Status};
#[derive(Debug)]
pub enum Body<'a> {
Data(Data<'a>),
Status(Status<'a>),
@ -88,6 +89,7 @@ impl<'a> ResponseBuilder<'a> {
}
}
#[derive(Debug)]
pub struct Response<'a> {
pub body: Vec<Body<'a>>,
pub completion: Status<'a>,
@ -110,3 +112,9 @@ impl<'a> Response<'a> {
})
}
}
#[derive(Debug)]
pub enum ResponseOrIdle {
Response(Response<'static>),
Idle,
}

46
src/imap/session.rs
View File

@ -1,7 +1,9 @@
use anyhow::anyhow;
use crate::imap::capability::{ClientCapability, ServerCapability};
use crate::imap::command::{anonymous, authenticated, examined, selected};
use crate::imap::flow;
use crate::imap::response::Response;
use crate::imap::request::Request;
use crate::imap::response::{Response, ResponseOrIdle};
use crate::login::ArcLoginProvider;
use imap_codec::imap_types::command::Command;
@ -23,7 +25,24 @@ impl Instance {
}
}
pub async fn command(&mut self, cmd: Command<'static>) -> Response<'static> {
pub async fn request(&mut self, req: Request) -> ResponseOrIdle {
match req {
Request::IdleUntil(stop) => ResponseOrIdle::Response(self.idle(stop).await),
Request::ImapCommand(cmd) => self.command(cmd).await,
}
}
pub async fn idle(&mut self, stop: tokio::sync::Notify) -> Response<'static> {
let (user, mbx) = match &mut self.state {
flow::State::Idle(ref user, ref mut mailbox, ref perm) => (user, mailbox),
_ => unreachable!(),
};
unimplemented!();
}
pub async fn command(&mut self, cmd: Command<'static>) -> ResponseOrIdle {
// Command behavior is modulated by the state.
// To prevent state error, we handle the same command in separate code paths.
let (resp, tr) = match &mut self.state {
@ -44,26 +63,18 @@ impl Instance {
};
authenticated::dispatch(ctx).await
}
flow::State::Selected(ref user, ref mut mailbox) => {
flow::State::Selected(ref user, ref mut mailbox, ref perm) => {
let ctx = selected::SelectedContext {
req: &cmd,
server_capabilities: &self.server_capabilities,
client_capabilities: &mut self.client_capabilities,
user,
mailbox,
perm,
};
selected::dispatch(ctx).await
}
flow::State::Examined(ref user, ref mut mailbox) => {
let ctx = examined::ExaminedContext {
req: &cmd,
server_capabilities: &self.server_capabilities,
client_capabilities: &mut self.client_capabilities,
user,
mailbox,
};
examined::dispatch(ctx).await
}
flow::State::Idle(..) => Err(anyhow!("can not receive command while idling")),
flow::State::Logout => Response::build()
.tag(cmd.tag.clone())
.message("No commands are allowed in the LOGOUT state.")
@ -88,15 +99,18 @@ impl Instance {
e,
cmd
);
return Response::build()
return ResponseOrIdle::Response(Response::build()
.to_req(&cmd)
.message(
"Internal error, processing command triggered an illegal IMAP state transition",
)
.bad()
.unwrap();
.unwrap());
}
resp
match self.state {
flow::State::Idle(..) => ResponseOrIdle::Idle,
_ => ResponseOrIdle::Response(resp),
}
}
}