User conn tracking, enqueue data, timers

Signed-off-by: Luca Fulchir <luca.fulchir@runesauth.com>

src/connection/mod.rs

@@ -5,7 +5,11 @@ pub mod packet;
 pub mod socket;
 pub mod stream;
 
-use ::std::{collections::HashMap, rc::Rc, vec::Vec};
+use ::core::num::Wrapping;
+use ::std::{
+    collections::{BTreeMap, HashMap},
+    vec::Vec,
+};
 
 pub use crate::connection::{handshake::Handshake, packet::Packet};
 
@@ -125,12 +129,12 @@ impl ProtocolVersion {
     }
 }
 
-#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq)]
-pub(crate) struct UserConnTracker(usize);
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd)]
+pub(crate) struct UserConnTracker(Wrapping<usize>);
 impl UserConnTracker {
     fn advance(&mut self) -> Self {
         let old = self.0;
-        self.0 = self.0 + 1;
+        self.0 = self.0 + Wrapping(1);
         UserConnTracker(old)
     }
 }
@@ -151,8 +155,13 @@ pub struct Conn {
 
 impl Conn {
     /// Queue some data to be sent in this connection
-    pub fn send(&mut self, stream: stream::ID, _data: Vec<u8>) {
-        todo!()
+    // TODO: send_and_wait, that wait for recipient ACK
+    pub async fn send(&mut self, stream: stream::ID, data: Vec<u8>) {
+        use crate::inner::worker::Work;
+        let _ = self
+            .queue
+            .send(Work::UserSend((self.conn, stream, data)))
+            .await;
     }
 }
 
@@ -160,15 +169,17 @@ impl Conn {
 #[derive(Debug)]
 pub(crate) struct Connection {
     /// Receiving Conn ID
-    pub id_recv: IDRecv,
+    pub(crate) id_recv: IDRecv,
     /// Sending Conn ID
-    pub id_send: IDSend,
+    pub(crate) id_send: IDSend,
     /// The main hkdf used for all secrets in this connection
-    pub hkdf: Hkdf,
+    hkdf: Hkdf,
     /// Cipher for decrypting data
-    pub cipher_recv: CipherRecv,
+    pub(crate) cipher_recv: CipherRecv,
     /// Cipher for encrypting data
-    pub cipher_send: CipherSend,
+    pub(crate) cipher_send: CipherSend,
+    /// send queue for each Stream
+    send_queue: BTreeMap<stream::ID, Vec<Vec<u8>>>,
 }
 
 /// Role: track the connection direction
@@ -210,14 +221,22 @@ impl Connection {
             hkdf,
             cipher_recv,
             cipher_send,
+            send_queue: BTreeMap::new(),
         }
     }
+    pub(crate) fn send(&mut self, stream: stream::ID, data: Vec<u8>) {
+        let stream = match self.send_queue.get_mut(&stream) {
+            None => return,
+            Some(stream) => stream,
+        };
+        stream.push(data);
+    }
 }
 
 pub(crate) struct ConnList {
     thread_id: ThreadTracker,
-    connections: Vec<Option<Rc<Connection>>>,
-    user_tracker: HashMap<UserConnTracker, usize>,
+    connections: Vec<Option<Connection>>,
+    user_tracker: BTreeMap<UserConnTracker, usize>,
     last_tracked: UserConnTracker,
     /// Bitmap to track which connection ids are used or free
     ids_used: Vec<::bitmaps::Bitmap<1024>>,
@@ -234,13 +253,27 @@ impl ConnList {
         let mut ret = Self {
             thread_id,
             connections: Vec::with_capacity(INITIAL_CAP),
-            user_tracker: HashMap::with_capacity(INITIAL_CAP),
-            last_tracked: UserConnTracker(0),
+            user_tracker: BTreeMap::new(),
+            last_tracked: UserConnTracker(Wrapping(0)),
             ids_used: vec![bitmap_id],
         };
         ret.connections.resize_with(INITIAL_CAP, || None);
         ret
     }
+    pub fn get_mut(
+        &mut self,
+        tracker: UserConnTracker,
+    ) -> Option<&mut Connection> {
+        let idx = if let Some(idx) = self.user_tracker.get(&tracker) {
+            *idx
+        } else {
+            return None;
+        };
+        match &mut self.connections[idx] {
+            None => None,
+            Some(conn) => Some(conn),
+        }
+    }
     pub fn len(&self) -> usize {
         let mut total: usize = 0;
         for bitmap in self.ids_used.iter() {
@@ -293,7 +326,7 @@ impl ConnList {
     /// NOTE: does NOT check if the connection has been previously reserved!
     pub(crate) fn track(
         &mut self,
-        conn: Rc<Connection>,
+        conn: Connection,
     ) -> Result<UserConnTracker, ()> {
         let conn_id = match conn.id_recv {
             IDRecv(ID::Handshake) => {
@@ -304,8 +337,14 @@ impl ConnList {
         let id_in_thread: usize =
             (conn_id.get() / (self.thread_id.total as u64)) as usize;
         self.connections[id_in_thread] = Some(conn);
-        let tracked = self.last_tracked.advance();
+        let mut tracked;
+        loop {
+            tracked = self.last_tracked.advance();
+            if self.user_tracker.get(&tracked).is_none() {
                 let _ = self.user_tracker.insert(tracked, id_in_thread);
+                break;
+            }
+        }
         Ok(tracked)
     }
     pub(crate) fn remove(&mut self, id: IDRecv) {

src/connection/stream/mod.rs

@@ -19,7 +19,7 @@ pub enum Kind {
 }
 
 /// Id of the stream
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct ID(pub u16);
 
 impl ID {

src/inner/mod.rs

@@ -4,6 +4,10 @@
 
 pub(crate) mod worker;
 
+use crate::inner::worker::Work;
+use ::std::{collections::BTreeMap, vec::Vec};
+use ::tokio::time::Instant;
+
 /// Track the total number of threads and our index
 /// 65K cpus should be enough for anybody
 #[derive(Debug, Clone, Copy)]
@@ -12,3 +16,83 @@ pub(crate) struct ThreadTracker {
     /// Note: starts from 1
     pub id: u16,
 }
+
+pub(crate) static mut SLEEP_RESOLUTION: ::std::time::Duration =
+    if cfg!(linux) || cfg!(macos) {
+        ::std::time::Duration::from_millis(1)
+    } else {
+        // windows
+        ::std::time::Duration::from_millis(16)
+    };
+
+pub(crate) async fn set_minimum_sleep_resolution() {
+    let nanosleep = ::std::time::Duration::from_nanos(1);
+    let mut tests: usize = 3;
+
+    while tests > 0 {
+        let pre_sleep = ::std::time::Instant::now();
+        ::tokio::time::sleep(nanosleep).await;
+        let post_sleep = ::std::time::Instant::now();
+        let slept_for = post_sleep - pre_sleep;
+        #[allow(unsafe_code)]
+        unsafe {
+            if slept_for < SLEEP_RESOLUTION {
+                SLEEP_RESOLUTION = slept_for;
+            }
+        }
+        tests = tests - 1;
+    }
+}
+
+/// Sleeping has a higher resolution that we would like for packet pacing.
+/// So we sleep for however log we need, then chunk up all the work here
+/// we will end up chunking the work in SLEEP_RESOLUTION, then we will busy wait
+/// for more precise timing
+pub(crate) struct Timers {
+    times: BTreeMap<Instant, Work>,
+}
+
+impl Timers {
+    pub(crate) fn new() -> Self {
+        Self {
+            times: BTreeMap::new(),
+        }
+    }
+    pub(crate) fn get_next(&self) -> ::tokio::time::Sleep {
+        match self.times.keys().next() {
+            Some(entry) => ::tokio::time::sleep_until((*entry).into()),
+            None => {
+                ::tokio::time::sleep(::std::time::Duration::from_secs(3600))
+            }
+        }
+    }
+    /// Get all the work from now up until now + SLEEP_RESOLUTION
+    pub(crate) fn get_work(&mut self) -> Vec<Work> {
+        let now: ::tokio::time::Instant = ::std::time::Instant::now().into();
+        let mut ret = Vec::with_capacity(4);
+        let mut count_rm = 0;
+        #[allow(unsafe_code)]
+        let next_instant = unsafe { now + SLEEP_RESOLUTION };
+        let mut iter = self.times.iter_mut().peekable();
+        loop {
+            match iter.peek() {
+                None => break,
+                Some(next) => {
+                    if *next.0 > next_instant {
+                        break;
+                    }
+                }
+            }
+            let mut work = Work::DropHandshake(crate::enc::asym::KeyID(0));
+            let mut entry = iter.next().unwrap();
+            ::core::mem::swap(&mut work, &mut entry.1);
+            ret.push(work);
+            count_rm = count_rm + 1;
+        }
+        while count_rm > 0 {
+            self.times.pop_first();
+            count_rm = count_rm - 1;
+        }
+        ret
+    }
+}

src/inner/worker.rs

@@ -11,7 +11,8 @@ use crate::{
         },
         packet::{self, Packet},
         socket::{UdpClient, UdpServer},
-        AuthSrvConn, ConnList, Connection, IDSend, ServiceConn,
+        stream, AuthSrvConn, ConnList, Connection, IDSend, ServiceConn,
+        UserConnTracker,
     },
     dnssec,
     enc::{
@@ -51,6 +52,7 @@ pub(crate) enum Work {
     Connect(ConnectInfo),
     DropHandshake(KeyID),
     Recv(RawUdp),
+    UserSend((UserConnTracker, stream::ID, Vec<u8>)),
 }
 
 /// Actual worker implementation.
@@ -70,6 +72,7 @@ pub struct Worker {
     thread_channels: Vec<::async_channel::Sender<Work>>,
     connections: ConnList,
     handshakes: handshake::Tracker,
+    work_timers: super::Timers,
 }
 
 #[allow(unsafe_code)]
@@ -126,12 +129,15 @@ impl Worker {
             thread_channels: Vec::new(),
             connections: ConnList::new(thread_id),
             handshakes,
+            work_timers: super::Timers::new(),
         })
     }
 
     /// Continuously loop and process work as needed
     pub async fn work_loop(&mut self) {
         'mainloop: loop {
+            let next_timer = self.work_timers.get_next();
+            ::tokio::pin!(next_timer);
             let work = ::tokio::select! {
                 tell_stopped = self.stop_working.recv() => {
                     if let Ok(stop_ch) = tell_stopped {
@@ -140,6 +146,13 @@ impl Worker {
                     }
                     break;
                 }
+                () = &mut next_timer =>  {
+                    let work_list = self.work_timers.get_work();
+                    for w in work_list.into_iter() {
+                        let _ = self.queue_sender.send(w).await;
+                    }
+                    continue 'mainloop;
+                }
                 maybe_timeout = self.queue.recv() => {
                     match maybe_timeout {
                         Ok(work) => work,
@@ -419,6 +432,13 @@ impl Worker {
                 Work::Recv(pkt) => {
                     self.recv(pkt).await;
                 }
+                Work::UserSend((tracker, stream, data)) => {
+                    let conn = match self.connections.get_mut(tracker) {
+                        None => return,
+                        Some(conn) => conn,
+                    };
+                    conn.send(stream, data);
+                }
             }
         }
     }
@@ -596,10 +616,9 @@ impl Worker {
                     let id_recv = conn.id_recv;
                     let cipher = conn.cipher_recv.kind();
                     // track the connection to the authentication server
-                    let track_auth_conn =
-                        match self.connections.track(conn.into()) {
+                    let track_auth_conn = match self.connections.track(conn) {
                         Ok(track_auth_conn) => track_auth_conn,
-                            Err(e) => {
+                        Err(_) => {
                             ::tracing::error!(
                                 "Could not track new auth srv connection"
                             );
@@ -635,12 +654,10 @@ impl Worker {
                         service_connection.id_recv = cci.service_connection_id;
                         service_connection.id_send =
                             IDSend(resp_data.service_connection_id);
-                        let track_serv_conn = match self
-                            .connections
-                            .track(service_connection.into())
-                        {
+                        let track_serv_conn =
+                            match self.connections.track(service_connection) {
                                 Ok(track_serv_conn) => track_serv_conn,
-                            Err(e) => {
+                                Err(_) => {
                                     ::tracing::error!(
                                         "Could not track new service connection"
                                     );
@@ -650,7 +667,8 @@ impl Worker {
                                     // FIXME: drop auth srv connection if we just
                                     // established it
                                     let _ = cci.answer.send(Err(
-                                    handshake::Error::InternalTracking.into(),
+                                        handshake::Error::InternalTracking
+                                            .into(),
                                     ));
                                     return;
                                 }

src/lib.rs

@@ -176,6 +176,7 @@ impl Fenrir {
         config: &Config,
         tokio_rt: Arc<::tokio::runtime::Runtime>,
     ) -> Result<Self, Error> {
+        inner::set_minimum_sleep_resolution().await;
         let (sender, _) = ::tokio::sync::broadcast::channel(1);
         let dnssec = dnssec::Dnssec::new(&config.resolvers)?;
         // bind sockets early so we can change "port 0" (aka: random)
@@ -214,6 +215,7 @@ impl Fenrir {
     pub async fn with_workers(
         config: &Config,
     ) -> Result<(Self, Vec<Worker>), Error> {
+        inner::set_minimum_sleep_resolution().await;
         let (stop_working, _) = ::tokio::sync::broadcast::channel(1);
         let dnssec = dnssec::Dnssec::new(&config.resolvers)?;
         // bind sockets early so we can change "port 0" (aka: random)