move address book to separate crate.

Also changes the address book to use the network zone trait

Cargo.toml

@@ -9,17 +9,20 @@ members = [
 	# "database",
 	"net/levin",
 	"net/monero-wire",
-	"p2p/monero-peer",
+	"p2p/monero-p2p",
+	"p2p/address-book",
 	"test-utils"
 ]
 
 [profile.release]
+panic = 'abort'
 lto           = true   # Build with LTO
 strip         = "none" # Keep panic stack traces
 codegen-units = 1      # Optimize for binary speed over compile times
 opt-level     = 3
 
 [profile.dev]
+panic = 'abort'
 lto           = false
 strip         = "none"
 # Not much slower compile times than opt-level 0, but much faster code.

common/Cargo.toml

@@ -5,10 +5,15 @@ edition = "2021"
 license = "AGPL-3.0-only"
 authors = ["Boog900"]
 
+[features]
+default = []
+borsh = ["dep:borsh"]
 
 [dependencies]
 chrono = "0.4.24"
 thiserror = "1"
 hex = "0.4"
 
-futures = "0.3.29"
+futures = "0.3.29"
+
+borsh = {version = "1.2.1", default-features = false, features = ["derive",], optional = true }

common/src/pruning.rs

@@ -18,6 +18,8 @@
 //! ```
 //!
 
+use std::cmp::Ordering;
+
 use thiserror::Error;
 
 use super::{
@@ -50,9 +52,33 @@ pub enum PruningError {
 ///
 // Internally we use an Option<u32> to represent if a pruning seed is 0 (None)which means
 // no pruning will take place.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 pub struct PruningSeed(Option<u32>);
 
+impl PartialOrd for PruningSeed {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for PruningSeed {
+    fn cmp(&self, other: &Self) -> Ordering {
+        match (self.get_log_stripes(), other.get_log_stripes()) {
+            (None, None) => Ordering::Equal,
+            (None, Some(_)) => Ordering::Greater,
+            (Some(_), None) => Ordering::Less,
+            (Some(stripe_s), Some(stripe_o)) => match stripe_s.cmp(&stripe_o) {
+                Ordering::Equal => self.get_stripe().unwrap().cmp(&other.get_stripe().unwrap()),
+                ordering => ordering,
+            },
+        }
+    }
+}
+
 impl PruningSeed {
     /// Creates a new pruning seed from a `stripe` and `log_stripes`
     ///
@@ -240,6 +266,12 @@ impl TryFrom<u32> for PruningSeed {
     }
 }
 
+impl From<PruningSeed> for u32 {
+    fn from(value: PruningSeed) -> Self {
+        value.0.unwrap_or(0)
+    }
+}
+
 fn get_block_pruning_stripe(
     block_height: u64,
     blockchain_height: u64,

p2p/address-book/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "monero-address-book"
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+authors = ["Boog900"]
+
+
+[dependencies]
+cuprate-common = {path = "../../common"}
+monero-wire = {path= "../../net/monero-wire"}
+monero-p2p = {path = "../monero-p2p" }
+
+tower = { version= "0.4.13", features = ["util", "buffer"] }
+tokio = {version = "1.34.0", default-features = false, features = ["time", "fs", "rt"]}
+
+futures = "0.3.29"
+pin-project = "1.1.3"
+async-trait = "0.1.74"
+
+thiserror = "1.0.50"
+tracing = "0.1.40"
+
+rand = "0.8.5"
+
+borsh = {version = "1.2.1", features = ["derive"]}
+
+[dev-dependencies]
+tokio = {version = "1.34.0", features = ["rt-multi-thread", "macros"]}
+cuprate-test-utils = {path = "../../test-utils"}

p2p/address-book/src/book.rs

@@ -0,0 +1,424 @@
+use std::{
+    collections::{HashMap, HashSet},
+    future::Future,
+    panic,
+    pin::Pin,
+    task::{Context, Poll},
+    time::Duration,
+};
+
+use futures::{stream::FuturesUnordered, FutureExt, StreamExt};
+use pin_project::pin_project;
+use tokio::{
+    task::JoinHandle,
+    time::{interval, sleep, Interval, MissedTickBehavior, Sleep},
+};
+use tower::Service;
+
+use cuprate_common::{tower_utils::InstaFuture, PruningSeed};
+use monero_p2p::{
+    client::InternalPeerID,
+    handles::ConnectionHandle,
+    services::{AddressBookRequest, AddressBookResponse, ZoneSpecificPeerListEntryBase},
+    NetZoneAddress, NetworkZone,
+};
+
+use crate::{peer_list::PeerList, store::save_peers_to_disk, AddressBookError, Config};
+
+#[cfg(test)]
+mod tests;
+
+/// An entry in the connected list.
+pub struct ConnectionPeerEntry<Z: NetworkZone> {
+    addr: Option<Z::Addr>,
+    id: u64,
+    handle: ConnectionHandle,
+    /// The peers pruning seed
+    pruning_seed: PruningSeed,
+    /// The peers port.
+    rpc_port: u16,
+    /// The peers rpc credits per hash
+    rpc_credits_per_hash: u32,
+}
+
+/// A future that resolves when a peer is unbanned.
+#[pin_project(project = EnumProj)]
+pub struct BanedPeerFut<Addr: NetZoneAddress>(Addr::BanID, #[pin] Sleep);
+
+impl<Addr: NetZoneAddress> Future for BanedPeerFut<Addr> {
+    type Output = Addr::BanID;
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+        match this.1.poll_unpin(cx) {
+            Poll::Pending => Poll::Pending,
+            Poll::Ready(_) => Poll::Ready(*this.0),
+        }
+    }
+}
+
+pub struct AddressBook<Z: NetworkZone> {
+    /// Our white peers - the peers we have previously connected to.
+    white_list: PeerList<Z>,
+    /// Our gray peers - the peers we have been told about but haven't connected to.
+    gray_list: PeerList<Z>,
+    /// Our anchor peers - on start up will contain a list of peers we were connected to before shutting down
+    /// after that will contain a list of peers currently connected to that we can reach.
+    anchor_list: HashSet<Z::Addr>,
+    /// The currently connected peers.
+    connected_peers: HashMap<InternalPeerID<Z::Addr>, ConnectionPeerEntry<Z>>,
+    connected_peers_ban_id: HashMap<<Z::Addr as NetZoneAddress>::BanID, HashSet<Z::Addr>>,
+    /// The currently banned peers
+    banned_peers: HashSet<<Z::Addr as NetZoneAddress>::BanID>,
+
+    banned_peers_fut: FuturesUnordered<BanedPeerFut<Z::Addr>>,
+
+    peer_save_task_handle: Option<JoinHandle<std::io::Result<()>>>,
+    peer_save_interval: Interval,
+
+    cfg: Config,
+}
+
+impl<Z: NetworkZone> AddressBook<Z> {
+    pub fn new(
+        cfg: Config,
+        white_peers: Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>,
+        gray_peers: Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>,
+        anchor_peers: Vec<Z::Addr>,
+    ) -> Self {
+        let white_list = PeerList::new(white_peers);
+        let gray_list = PeerList::new(gray_peers);
+        let anchor_list = HashSet::from_iter(anchor_peers);
+
+        // TODO: persist banned peers
+        let banned_peers = HashSet::new();
+        let banned_peers_fut = FuturesUnordered::new();
+        let connected_peers = HashMap::new();
+
+        let mut peer_save_interval = interval(cfg.peer_save_period);
+        peer_save_interval.set_missed_tick_behavior(MissedTickBehavior::Delay);
+
+        Self {
+            white_list,
+            gray_list,
+            anchor_list,
+            connected_peers,
+            connected_peers_ban_id: HashMap::new(),
+            banned_peers,
+            banned_peers_fut,
+            peer_save_task_handle: None,
+            peer_save_interval,
+            cfg,
+        }
+    }
+
+    fn poll_save_to_disk(&mut self, cx: &mut Context<'_>) {
+        if let Some(handle) = &mut self.peer_save_task_handle {
+            // if we have already spawned a task to save the peer list wait for that to complete.
+            match handle.poll_unpin(cx) {
+                Poll::Pending => return,
+                Poll::Ready(Ok(Err(e))) => {
+                    tracing::error!("Could not save peer list to disk, got error: {}", e)
+                }
+                Poll::Ready(Err(e)) => {
+                    if e.is_panic() {
+                        panic::resume_unwind(e.into_panic())
+                    }
+                }
+                _ => (),
+            }
+        }
+        // the task is finished.
+        self.peer_save_task_handle = None;
+
+        let Poll::Ready(_) = self.peer_save_interval.poll_tick(cx) else {
+            return;
+        };
+
+        self.peer_save_task_handle = Some(save_peers_to_disk(
+            &self.cfg,
+            &self.white_list,
+            &self.gray_list,
+        ));
+    }
+
+    fn poll_unban_peers(&mut self, cx: &mut Context<'_>) {
+        while let Poll::Ready(Some(ban_id)) = self.banned_peers_fut.poll_next_unpin(cx) {
+            self.banned_peers.remove(&ban_id);
+        }
+    }
+
+    fn poll_connected_peers(&mut self) {
+        let mut internal_addr_disconnected = Vec::new();
+        let mut addrs_to_ban = Vec::new();
+
+        for (internal_addr, peer) in &mut self.connected_peers {
+            if let Some(time) = peer.handle.check_should_ban() {
+                match internal_addr {
+                    InternalPeerID::KnownAddr(addr) => addrs_to_ban.push((*addr, time.0)),
+                    // If we don't know the peers address all we can do is disconnect.
+                    InternalPeerID::Unknown(_) => peer.handle.send_close_signal(),
+                }
+            }
+
+            if peer.handle.is_closed() {
+                internal_addr_disconnected.push(*internal_addr);
+            }
+        }
+
+        for (addr, time) in addrs_to_ban.into_iter() {
+            self.ban_peer(addr, time);
+        }
+
+        for disconnected_addr in internal_addr_disconnected {
+            self.connected_peers.remove(&disconnected_addr);
+            if let InternalPeerID::KnownAddr(addr) = disconnected_addr {
+                // remove the peer from the connected peers with this ban ID.
+                self.connected_peers_ban_id
+                    .get_mut(&addr.ban_id())
+                    .unwrap()
+                    .remove(&addr);
+
+                // If the amount of peers with this ban id is 0 remove the whole set.
+                if self
+                    .connected_peers_ban_id
+                    .get(&addr.ban_id())
+                    .unwrap()
+                    .is_empty()
+                {
+                    self.connected_peers_ban_id.remove(&addr.ban_id());
+                }
+                // remove the peer from the anchor list.
+                self.anchor_list.remove(&addr);
+            }
+        }
+    }
+
+    fn ban_peer(&mut self, addr: Z::Addr, time: Duration) {
+        if self.banned_peers.contains(&addr.ban_id()) {
+            return;
+        }
+
+        if let Some(connected_peers_with_ban_id) = self.connected_peers_ban_id.get(&addr.ban_id()) {
+            for peer in connected_peers_with_ban_id.iter().map(|addr| {
+                tracing::debug!("Banning peer: {}, for: {:?}", addr, time);
+
+                self.connected_peers
+                    .get(&InternalPeerID::KnownAddr(*addr))
+                    .expect("Peer must be in connected list if in connected_peers_with_ban_id")
+            }) {
+                // The peer will get removed from our connected list once we disconnect
+                peer.handle.send_close_signal();
+                // Remove the peer now from anchors so we don't accidentally persist a bad anchor peer to disk.
+                self.anchor_list.remove(&addr);
+            }
+        }
+
+        self.white_list.remove_peers_with_ban_id(&addr.ban_id());
+        self.gray_list.remove_peers_with_ban_id(&addr.ban_id());
+
+        self.banned_peers.insert(addr.ban_id());
+        self.banned_peers_fut
+            .push(BanedPeerFut(addr.ban_id(), sleep(time)))
+    }
+
+    /// adds a peer to the gray list.
+    fn add_peer_to_gray_list(&mut self, mut peer: ZoneSpecificPeerListEntryBase<Z::Addr>) {
+        if self.white_list.contains_peer(&peer.adr) {
+            return;
+        };
+        if !self.gray_list.contains_peer(&peer.adr) {
+            peer.last_seen = 0;
+            self.gray_list.add_new_peer(peer);
+        }
+    }
+
+    /// Checks if a peer is banned.
+    fn is_peer_banned(&self, peer: &Z::Addr) -> bool {
+        self.banned_peers.contains(&peer.ban_id())
+    }
+
+    fn handle_incoming_peer_list(
+        &mut self,
+        mut peer_list: Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>,
+    ) {
+        tracing::debug!("Received new peer list, length: {}", peer_list.len());
+
+        peer_list.retain(|peer| {
+            if !peer.adr.should_add_to_peer_list() {
+                false
+            } else {
+                !self.is_peer_banned(&peer.adr)
+            }
+            // TODO: check rpc/ p2p ports not the same
+        });
+
+        for peer in peer_list {
+            self.add_peer_to_gray_list(peer);
+        }
+        // The gray list has no peers we need to keep in the list so just pass an empty HashSet.
+        self.gray_list
+            .reduce_list(&HashSet::new(), self.cfg.max_gray_list_length);
+    }
+
+    fn get_random_white_peer(
+        &self,
+        block_needed: Option<u64>,
+    ) -> Option<ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        tracing::debug!("Retrieving random white peer");
+        self.white_list
+            .get_random_peer(&mut rand::thread_rng(), block_needed)
+            .copied()
+    }
+
+    fn get_random_gray_peer(
+        &self,
+        block_needed: Option<u64>,
+    ) -> Option<ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        tracing::debug!("Retrieving random gray peer");
+        self.gray_list
+            .get_random_peer(&mut rand::thread_rng(), block_needed)
+            .copied()
+    }
+
+    fn get_white_peers(&self, len: usize) -> Vec<ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        tracing::debug!("Retrieving white peers, maximum: {}", len);
+        self.white_list
+            .get_random_peers(&mut rand::thread_rng(), len)
+    }
+
+    /// Updates an entry in the white list, if the peer is not found then
+    /// the peer will be added to the white list.
+    fn update_white_list_peer_entry(
+        &mut self,
+        peer: &ConnectionPeerEntry<Z>,
+    ) -> Result<(), AddressBookError> {
+        let Some(addr) = &peer.addr else {
+            // If the peer isn't reachable we shouldn't add it too our address book.
+            return Ok(());
+        };
+
+        if let Some(peb) = self.white_list.get_peer_mut(addr) {
+            if peb.pruning_seed != peer.pruning_seed {
+                return Err(AddressBookError::PeersDataChanged("Pruning seed"));
+            }
+            if Z::CHECK_NODE_ID && peb.id != peer.id {
+                return Err(AddressBookError::PeersDataChanged("peer ID"));
+            }
+            // TODO: cuprate doesn't need last seen timestamps but should we have them anyway?
+            peb.last_seen = 0;
+            peb.rpc_port = peer.rpc_port;
+            peb.rpc_credits_per_hash = peer.rpc_credits_per_hash;
+        } else {
+            // if the peer is reachable add it to our white list
+            let peb = ZoneSpecificPeerListEntryBase {
+                id: peer.id,
+                adr: *addr,
+                last_seen: 0,
+                rpc_port: peer.rpc_port,
+                rpc_credits_per_hash: peer.rpc_credits_per_hash,
+                pruning_seed: peer.pruning_seed,
+            };
+            self.white_list.add_new_peer(peb);
+        }
+        Ok(())
+    }
+
+    fn handle_new_connection(
+        &mut self,
+        internal_peer_id: InternalPeerID<Z::Addr>,
+        peer: ConnectionPeerEntry<Z>,
+    ) -> Result<(), AddressBookError> {
+        if self.connected_peers.contains_key(&internal_peer_id) {
+            return Err(AddressBookError::PeerAlreadyConnected);
+        }
+
+        // If we know the address then check if it's banned.
+        if let InternalPeerID::KnownAddr(addr) = &internal_peer_id {
+            if self.is_peer_banned(addr) {
+                return Err(AddressBookError::PeerIsBanned);
+            }
+            // although the peer may not be readable still add it to the connected peers with ban ID.
+            self.connected_peers_ban_id
+                .entry(addr.ban_id())
+                .or_default()
+                .insert(*addr);
+        }
+
+        // if the address is Some that means we can reach it from our node.
+        if let Some(addr) = peer.addr {
+            // remove the peer from the gray list as we know it's active.
+            self.gray_list.remove_peer(&addr);
+            // The peer is reachable, update our white list and add it to the anchor connections.
+            self.update_white_list_peer_entry(&peer)?;
+            self.white_list
+                .reduce_list(&self.anchor_list, self.cfg.max_white_list_length);
+            self.anchor_list.insert(addr);
+        }
+
+        self.connected_peers.insert(internal_peer_id, peer);
+        Ok(())
+    }
+}
+
+impl<Z: NetworkZone> Service<AddressBookRequest<Z>> for AddressBook<Z> {
+    type Response = AddressBookResponse<Z>;
+    type Error = AddressBookError;
+    type Future = InstaFuture<Result<Self::Response, Self::Error>>;
+
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.poll_unban_peers(cx);
+        self.poll_save_to_disk(cx);
+        self.poll_connected_peers();
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, req: AddressBookRequest<Z>) -> Self::Future {
+        let span = tracing::info_span!("AddressBook");
+        let _guard = span.enter();
+
+        let response = match req {
+            AddressBookRequest::NewConnection {
+                addr,
+                internal_peer_id,
+                handle,
+                id,
+                pruning_seed,
+                rpc_port,
+                rpc_credits_per_hash,
+            } => self
+                .handle_new_connection(
+                    internal_peer_id,
+                    ConnectionPeerEntry {
+                        addr,
+                        id,
+                        handle,
+                        pruning_seed,
+                        rpc_port,
+                        rpc_credits_per_hash,
+                    },
+                )
+                .map(|_| AddressBookResponse::Ok),
+            AddressBookRequest::BanPeer(addr, time) => {
+                self.ban_peer(addr, time);
+                Ok(AddressBookResponse::Ok)
+            }
+            AddressBookRequest::IncomingPeerList(peer_list) => {
+                self.handle_incoming_peer_list(peer_list);
+                Ok(AddressBookResponse::Ok)
+            }
+            AddressBookRequest::GetRandomWhitePeer { height } => self
+                .get_random_white_peer(height)
+                .map(AddressBookResponse::Peer)
+                .ok_or(AddressBookError::PeerNotFound),
+            AddressBookRequest::GetRandomGrayPeer { height } => self
+                .get_random_gray_peer(height)
+                .map(AddressBookResponse::Peer)
+                .ok_or(AddressBookError::PeerNotFound),
+            AddressBookRequest::GetWhitePeers(len) => {
+                Ok(AddressBookResponse::Peers(self.get_white_peers(len)))
+            }
+        };
+
+        InstaFuture::from(response)
+    }
+}

p2p/address-book/src/book/tests.rs

@@ -0,0 +1,149 @@
+use std::{path::PathBuf, sync::Arc, time::Duration};
+
+use futures::StreamExt;
+use tokio::sync::Semaphore;
+use tokio::time::interval;
+
+use cuprate_common::PruningSeed;
+use monero_p2p::handles::HandleBuilder;
+
+use super::{AddressBook, ConnectionPeerEntry, InternalPeerID};
+use crate::{peer_list::tests::make_fake_peer_list, AddressBookError, Config};
+
+use cuprate_test_utils::test_netzone::{TestNetZone, TestNetZoneAddr};
+
+fn test_cfg() -> Config {
+    Config {
+        max_white_list_length: 100,
+        max_gray_list_length: 500,
+        peer_store_file: PathBuf::new(),
+        peer_save_period: Duration::from_secs(60),
+    }
+}
+
+fn make_fake_address_book(
+    numb_white: u32,
+    numb_gray: u32,
+) -> AddressBook<TestNetZone<true, true, true>> {
+    let white_list = make_fake_peer_list(0, numb_white);
+    let gray_list = make_fake_peer_list(numb_white, numb_gray);
+
+    AddressBook {
+        white_list,
+        gray_list,
+        anchor_list: Default::default(),
+        connected_peers: Default::default(),
+        connected_peers_ban_id: Default::default(),
+        banned_peers: Default::default(),
+        banned_peers_fut: Default::default(),
+        peer_save_task_handle: None,
+        peer_save_interval: interval(Duration::from_secs(60)),
+        cfg: test_cfg(),
+    }
+}
+
+#[tokio::test]
+async fn get_random_peers() {
+    let address_book = make_fake_address_book(50, 250);
+    let peer = address_book.get_random_white_peer(None).unwrap();
+    assert!(address_book.white_list.contains_peer(&peer.adr));
+    assert!(!address_book.gray_list.contains_peer(&peer.adr));
+
+    let peer = address_book.get_random_gray_peer(None).unwrap();
+    assert!(!address_book.white_list.contains_peer(&peer.adr));
+    assert!(address_book.gray_list.contains_peer(&peer.adr));
+}
+
+#[tokio::test]
+async fn get_white_peers() {
+    let address_book = make_fake_address_book(100, 0);
+    let peers = address_book.get_white_peers(50);
+    assert_eq!(peers.len(), 50);
+    let peers = address_book.get_white_peers(60);
+    assert_eq!(peers.len(), 60);
+    for window in peers.windows(2) {
+        assert_ne!(window[0], window[1]);
+    }
+
+    let address_book = make_fake_address_book(45, 0);
+    let peers = address_book.get_white_peers(50);
+    assert_eq!(peers.len(), 45);
+    let peers = address_book.get_white_peers(60);
+    assert_eq!(peers.len(), 45);
+    for window in peers.windows(2) {
+        assert_ne!(window[0], window[1]);
+    }
+}
+
+#[tokio::test]
+async fn add_new_peer_already_connected() {
+    let mut address_book = make_fake_address_book(0, 0);
+
+    let semaphore = Arc::new(Semaphore::new(10));
+
+    let (_, handle, _) = HandleBuilder::default()
+        .with_permit(semaphore.clone().try_acquire_owned().unwrap())
+        .build();
+
+    address_book
+        .handle_new_connection(
+            InternalPeerID::KnownAddr(TestNetZoneAddr(1)),
+            ConnectionPeerEntry {
+                addr: None,
+                id: 0,
+                handle,
+                pruning_seed: PruningSeed::try_from(385).unwrap(),
+                rpc_port: 0,
+                rpc_credits_per_hash: 0,
+            },
+        )
+        .unwrap();
+
+    let (_, handle, _) = HandleBuilder::default()
+        .with_permit(semaphore.try_acquire_owned().unwrap())
+        .build();
+
+    assert_eq!(
+        address_book.handle_new_connection(
+            InternalPeerID::KnownAddr(TestNetZoneAddr(1)),
+            ConnectionPeerEntry {
+                addr: None,
+                id: 0,
+                handle,
+                pruning_seed: PruningSeed::try_from(385).unwrap(),
+                rpc_port: 0,
+                rpc_credits_per_hash: 0,
+            },
+        ),
+        Err(AddressBookError::PeerAlreadyConnected)
+    )
+}
+
+#[tokio::test]
+async fn banned_peer_removed_from_peer_lists() {
+    let mut address_book = make_fake_address_book(100, 0);
+
+    assert_eq!(address_book.banned_peers.len(), 0);
+    assert_eq!(address_book.white_list.len(), 100);
+
+    address_book.ban_peer(TestNetZoneAddr(1), Duration::from_secs(1));
+    assert_eq!(address_book.banned_peers.len(), 1);
+    assert_eq!(address_book.white_list.len(), 99);
+
+    address_book.ban_peer(TestNetZoneAddr(1), Duration::from_secs(1));
+    assert_eq!(address_book.banned_peers.len(), 1);
+    assert_eq!(address_book.white_list.len(), 99);
+
+    address_book.ban_peer(TestNetZoneAddr(1), Duration::from_secs(1));
+    assert_eq!(address_book.banned_peers.len(), 1);
+    assert_eq!(address_book.white_list.len(), 99);
+
+    address_book.ban_peer(TestNetZoneAddr(5), Duration::from_secs(100));
+    assert_eq!(address_book.banned_peers.len(), 2);
+    assert_eq!(address_book.white_list.len(), 98);
+
+    assert_eq!(
+        address_book.banned_peers_fut.next().await.unwrap(),
+        TestNetZoneAddr(1)
+    )
+}

p2p/address-book/src/lib.rs

@@ -0,0 +1,76 @@
+//! Cuprate Address Book
+//!
+//! This module holds the logic for persistent peer storage.
+//! Cuprates address book is modeled as a [`tower::Service`]
+//! The request is [`AddressBookRequest`] and the response is
+//! [`AddressBookResponse`].
+//!
+//! Cuprate, like monerod, actually has multiple address books, one
+//! for each [`NetworkZone`]. This is to reduce the possibility of
+//! clear net peers getting linked to their dark counterparts
+//! and so peers will only get told about peers they can
+//! connect to.
+//!
+
+use std::{path::PathBuf, time::Duration};
+
+use monero_p2p::{
+    services::{AddressBookRequest, AddressBookResponse},
+    NetworkZone,
+};
+
+mod book;
+mod peer_list;
+mod store;
+
+#[derive(Debug, Clone)]
+pub struct Config {
+    max_white_list_length: usize,
+    max_gray_list_length: usize,
+    peer_store_file: PathBuf,
+    peer_save_period: Duration,
+}
+
+/// Possible errors when dealing with the address book.
+/// This is boxed when returning an error in the [`tower::Service`].
+#[derive(Debug, thiserror::Error, Eq, PartialEq)]
+pub enum AddressBookError {
+    /// The peer is already connected.
+    #[error("Peer is already connected")]
+    PeerAlreadyConnected,
+    /// The peer is not in the address book for this zone.
+    #[error("Peer was not found in book")]
+    PeerNotFound,
+    /// The peer list is empty.
+    #[error("The peer list is empty")]
+    PeerListEmpty,
+    /// Immutable peer data was changed.
+    #[error("Immutable peer data was changed: {0}")]
+    PeersDataChanged(&'static str),
+    /// The peer is banned.
+    #[error("The peer is banned")]
+    PeerIsBanned,
+    /// The channel to the address book has closed unexpectedly.
+    #[error("The address books channel has closed.")]
+    AddressBooksChannelClosed,
+    /// The address book task has exited.
+    #[error("The address book task has exited.")]
+    AddressBookTaskExited,
+}
+
+pub async fn init_address_book<Z: NetworkZone>(
+    cfg: Config,
+) -> Result<
+    impl tower::Service<
+        AddressBookRequest<Z>,
+        Response = AddressBookResponse<Z>,
+        Error = tower::BoxError,
+    >,
+    std::io::Error,
+> {
+    let (white_list, gray_list) = store::read_peers_from_disk::<Z>(&cfg).await?;
+
+    let address_book = book::AddressBook::<Z>::new(cfg, white_list, gray_list, Vec::new());
+
+    Ok(tower::buffer::Buffer::new(address_book, 15))
+}

p2p/address-book/src/peer_list.rs

@@ -0,0 +1,240 @@
+use std::collections::{BTreeMap, HashMap, HashSet};
+
+use rand::{seq::SliceRandom, Rng};
+
+use cuprate_common::{PruningSeed, CRYPTONOTE_MAX_BLOCK_NUMBER};
+use monero_p2p::{services::ZoneSpecificPeerListEntryBase, NetZoneAddress, NetworkZone};
+
+#[cfg(test)]
+pub mod tests;
+
+/// A Peer list in the address book.
+///
+/// This could either be the white list or gray list.
+#[derive(Debug)]
+pub struct PeerList<Z: NetworkZone> {
+    /// The peers with their peer data.
+    pub peers: HashMap<Z::Addr, ZoneSpecificPeerListEntryBase<Z::Addr>>,
+    /// An index of Pruning seed to address, so can quickly grab peers with the blocks
+    /// we want.
+    ///
+    /// Pruning seeds are sorted by first their log_stripes and then their stripe.
+    /// This means the first peers in this list will store more blocks than peers
+    /// later on. So when we need a peer with a certain block we look at the peers
+    /// storing more blocks first then work our way to the peers storing less.
+    ///  
+    pruning_seeds: BTreeMap<PruningSeed, Vec<Z::Addr>>,
+    /// A hashmap linking ban_ids to addresses.
+    ban_ids: HashMap<<Z::Addr as NetZoneAddress>::BanID, Vec<Z::Addr>>,
+}
+
+impl<Z: NetworkZone> PeerList<Z> {
+    /// Creates a new peer list.
+    pub fn new(list: Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>) -> PeerList<Z> {
+        let mut peers = HashMap::with_capacity(list.len());
+        let mut pruning_seeds = BTreeMap::new();
+        let mut ban_ids = HashMap::with_capacity(list.len());
+
+        for peer in list {
+            pruning_seeds
+                .entry(peer.pruning_seed)
+                .or_insert_with(Vec::new)
+                .push(peer.adr);
+
+            ban_ids
+                .entry(peer.adr.ban_id())
+                .or_insert_with(Vec::new)
+                .push(peer.adr);
+
+            peers.insert(peer.adr, peer);
+        }
+        PeerList {
+            peers,
+            pruning_seeds,
+            ban_ids,
+        }
+    }
+
+    /// Gets the length of the peer list
+    pub fn len(&self) -> usize {
+        self.peers.len()
+    }
+
+    /// Adds a new peer to the peer list
+    pub fn add_new_peer(&mut self, peer: ZoneSpecificPeerListEntryBase<Z::Addr>) {
+        if self.peers.insert(peer.adr, peer).is_none() {
+            // It's more clear with this
+            #[allow(clippy::unwrap_or_default)]
+            self.pruning_seeds
+                .entry(peer.pruning_seed)
+                .or_insert_with(Vec::new)
+                .push(peer.adr);
+
+            #[allow(clippy::unwrap_or_default)]
+            self.ban_ids
+                .entry(peer.adr.ban_id())
+                .or_insert_with(Vec::new)
+                .push(peer.adr);
+        }
+    }
+
+    /// Gets a reference to a peer
+    pub fn get_peer(&self, peer: &Z::Addr) -> Option<&ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        self.peers.get(peer)
+    }
+
+    /// Returns a random peer.
+    /// If the pruning seed is specified then we will get a random peer with
+    /// that pruning seed otherwise we will just get a random peer in the whole
+    /// list.
+    pub fn get_random_peer<R: Rng>(
+        &self,
+        r: &mut R,
+        block_needed: Option<u64>,
+    ) -> Option<&ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        if let Some(needed_height) = block_needed {
+            let (_, addresses_with_block) = self.pruning_seeds.iter().find(|(seed, _)| {
+                // TODO: factor in peer blockchain height?
+                seed.get_next_unpruned_block(needed_height, CRYPTONOTE_MAX_BLOCK_NUMBER)
+                    .expect("Explain")
+                    == needed_height
+            })?;
+            let n = r.gen_range(0..addresses_with_block.len());
+            self.get_peer(&addresses_with_block[n])
+        } else {
+            let len = self.len();
+            if len == 0 {
+                None
+            } else {
+                let n = r.gen_range(0..len);
+
+                self.peers.values().nth(n)
+            }
+        }
+    }
+
+    pub fn get_random_peers<R: Rng>(
+        &self,
+        r: &mut R,
+        len: usize,
+    ) -> Vec<ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        let mut peers = self.peers.values().copied().collect::<Vec<_>>();
+        peers.shuffle(r);
+        peers.drain(len.min(peers.len())..peers.len());
+        peers
+    }
+
+    /// Returns a mutable reference to a peer.
+    pub fn get_peer_mut(
+        &mut self,
+        peer: &Z::Addr,
+    ) -> Option<&mut ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        self.peers.get_mut(peer)
+    }
+
+    /// Returns true if the list contains this peer.
+    pub fn contains_peer(&self, peer: &Z::Addr) -> bool {
+        self.peers.contains_key(peer)
+    }
+
+    /// Removes a peer from the pruning idx
+    ///
+    /// MUST NOT BE USED ALONE
+    fn remove_peer_pruning_idx(&mut self, peer: &ZoneSpecificPeerListEntryBase<Z::Addr>) {
+        remove_peer_idx::<Z>(self.pruning_seeds.get_mut(&peer.pruning_seed), &peer.adr);
+        if self
+            .pruning_seeds
+            .get(&peer.pruning_seed)
+            .expect("There must be a peer with this id")
+            .is_empty()
+        {
+            self.pruning_seeds.remove(&peer.pruning_seed);
+        }
+    }
+
+    /// Removes a peer from the ban idx
+    ///
+    /// MUST NOT BE USED ALONE
+    fn remove_peer_ban_idx(&mut self, peer: &ZoneSpecificPeerListEntryBase<Z::Addr>) {
+        remove_peer_idx::<Z>(self.ban_ids.get_mut(&peer.adr.ban_id()), &peer.adr);
+        if self
+            .ban_ids
+            .get(&peer.adr.ban_id())
+            .expect("There must be a peer with this id")
+            .is_empty()
+        {
+            self.ban_ids.remove(&peer.adr.ban_id());
+        }
+    }
+
+    /// Removes a peer from all the indexes
+    ///
+    /// MUST NOT BE USED ALONE
+    fn remove_peer_from_all_idxs(&mut self, peer: &ZoneSpecificPeerListEntryBase<Z::Addr>) {
+        self.remove_peer_pruning_idx(peer);
+        self.remove_peer_ban_idx(peer)
+    }
+
+    /// Removes a peer from the peer list
+    pub fn remove_peer(
+        &mut self,
+        peer: &Z::Addr,
+    ) -> Option<ZoneSpecificPeerListEntryBase<Z::Addr>> {
+        let peer_eb = self.peers.remove(peer)?;
+        self.remove_peer_from_all_idxs(&peer_eb);
+        Some(peer_eb)
+    }
+
+    /// Removes all peers with a specific ban id.
+    pub fn remove_peers_with_ban_id(&mut self, ban_id: &<Z::Addr as NetZoneAddress>::BanID) {
+        let Some(addresses) = self.ban_ids.get(ban_id) else {
+            // No peers to ban
+            return;
+        };
+
+        for addr in addresses.clone() {
+            self.remove_peer(&addr);
+        }
+    }
+
+    /// Tries to reduce the peer list to `new_len`.
+    ///
+    /// This function could keep the list bigger than `new_len` if `must_keep_peers`s length
+    /// is larger than new_len, in that case we will remove as much as we can.
+    pub fn reduce_list(&mut self, must_keep_peers: &HashSet<Z::Addr>, new_len: usize) {
+        if new_len >= self.len() {
+            return;
+        }
+
+        let target_removed = self.len() - new_len;
+        let mut removed_count = 0;
+        let mut peers_to_remove: Vec<Z::Addr> = Vec::with_capacity(target_removed);
+
+        for peer_adr in self.peers.keys() {
+            if removed_count >= target_removed {
+                break;
+            }
+            if !must_keep_peers.contains(peer_adr) {
+                peers_to_remove.push(*peer_adr);
+                removed_count += 1;
+            }
+        }
+
+        for peer_adr in peers_to_remove {
+            let _ = self.remove_peer(&peer_adr);
+        }
+    }
+}
+
+/// Remove a peer from an index.
+fn remove_peer_idx<Z: NetworkZone>(peer_list: Option<&mut Vec<Z::Addr>>, addr: &Z::Addr) {
+    if let Some(peer_list) = peer_list {
+        if let Some(idx) = peer_list.iter().position(|peer_adr| peer_adr == addr) {
+            peer_list.swap_remove(idx);
+        } else {
+            unreachable!("This function will only be called when the peer exists.");
+        }
+    } else {
+        unreachable!("Index must exist if a peer has that index");
+    }
+}

p2p/address-book/src/peer_list/tests.rs

@@ -0,0 +1,186 @@
+use std::collections::HashSet;
+
+use rand::Rng;
+
+use cuprate_common::PruningSeed;
+use monero_p2p::services::ZoneSpecificPeerListEntryBase;
+
+use cuprate_test_utils::test_netzone::{TestNetZone, TestNetZoneAddr};
+use monero_p2p::NetZoneAddress;
+
+use super::PeerList;
+
+fn make_fake_peer(
+    id: u32,
+    pruning_seed: Option<u32>,
+) -> ZoneSpecificPeerListEntryBase<TestNetZoneAddr> {
+    ZoneSpecificPeerListEntryBase {
+        adr: TestNetZoneAddr(id),
+        id: id as u64,
+        last_seen: 0,
+        pruning_seed: PruningSeed::try_from(pruning_seed.unwrap_or(0)).unwrap(),
+        rpc_port: 0,
+        rpc_credits_per_hash: 0,
+    }
+}
+
+pub fn make_fake_peer_list(
+    start_idx: u32,
+    numb_o_peers: u32,
+) -> PeerList<TestNetZone<true, true, true>> {
+    let mut peer_list = Vec::with_capacity(numb_o_peers as usize);
+
+    for idx in start_idx..(start_idx + numb_o_peers) {
+        peer_list.push(make_fake_peer(idx, None))
+    }
+
+    PeerList::new(peer_list)
+}
+
+fn make_fake_peer_list_with_random_pruning_seeds(
+    numb_o_peers: u32,
+) -> PeerList<TestNetZone<true, true, true>> {
+    let mut r = rand::thread_rng();
+
+    let mut peer_list = Vec::with_capacity(numb_o_peers as usize);
+
+    for idx in 0..numb_o_peers {
+        peer_list.push(make_fake_peer(
+            idx,
+            Some(if r.gen_bool(0.4) {
+                0
+            } else {
+                r.gen_range(384..=391)
+            }),
+        ))
+    }
+    PeerList::new(peer_list)
+}
+
+#[test]
+fn peer_list_reduce_length() {
+    let mut peer_list = make_fake_peer_list(0, 2090);
+    let must_keep_peers = HashSet::new();
+
+    let target_len = 2000;
+
+    peer_list.reduce_list(&must_keep_peers, target_len);
+
+    assert_eq!(peer_list.len(), target_len);
+}
+
+#[test]
+fn peer_list_reduce_length_with_peers_we_need() {
+    let mut peer_list = make_fake_peer_list(0, 500);
+    let must_keep_peers = HashSet::from_iter(peer_list.peers.keys().copied());
+
+    let target_len = 49;
+
+    peer_list.reduce_list(&must_keep_peers, target_len);
+
+    // we can't remove any of the peers we said we need them all
+    assert_eq!(peer_list.len(), 500);
+}
+
+#[test]
+fn peer_list_remove_specific_peer() {
+    let mut peer_list = make_fake_peer_list_with_random_pruning_seeds(100);
+
+    let peer = *peer_list
+        .get_random_peer(&mut rand::thread_rng(), None)
+        .unwrap();
+
+    assert!(peer_list.remove_peer(&peer.adr).is_some());
+
+    let pruning_idxs = peer_list.pruning_seeds;
+    let peers = peer_list.peers;
+
+    for (_, addrs) in pruning_idxs {
+        addrs.iter().for_each(|adr| assert_ne!(adr, &peer.adr))
+    }
+
+    assert!(!peers.contains_key(&peer.adr));
+}
+
+#[test]
+fn peer_list_pruning_idxs_are_correct() {
+    let peer_list = make_fake_peer_list_with_random_pruning_seeds(100);
+    let mut total_len = 0;
+
+    for (seed, list) in peer_list.pruning_seeds {
+        for peer in list.iter() {
+            assert_eq!(peer_list.peers.get(peer).unwrap().pruning_seed, seed);
+            total_len += 1;
+        }
+    }
+
+    assert_eq!(total_len, peer_list.peers.len())
+}
+
+#[test]
+fn peer_list_add_new_peer() {
+    let mut peer_list = make_fake_peer_list(0, 10);
+    let new_peer = make_fake_peer(50, None);
+
+    peer_list.add_new_peer(new_peer);
+
+    assert_eq!(peer_list.len(), 11);
+    assert_eq!(peer_list.get_peer(&new_peer.adr), Some(&new_peer));
+    assert!(peer_list
+        .pruning_seeds
+        .get(&new_peer.pruning_seed)
+        .unwrap()
+        .contains(&new_peer.adr));
+}
+
+#[test]
+fn peer_list_add_existing_peer() {
+    let mut peer_list = make_fake_peer_list(0, 10);
+    let existing_peer = *peer_list.get_peer(&TestNetZoneAddr(0)).unwrap();
+
+    peer_list.add_new_peer(existing_peer);
+
+    assert_eq!(peer_list.len(), 10);
+    assert_eq!(peer_list.get_peer(&existing_peer.adr), Some(&existing_peer));
+}
+
+#[test]
+fn peer_list_get_non_existent_peer() {
+    let peer_list = make_fake_peer_list(0, 10);
+    let non_existent_peer = TestNetZoneAddr(50);
+    assert_eq!(peer_list.get_peer(&non_existent_peer), None);
+}
+
+#[test]
+fn peer_list_get_peer_with_block() {
+    let mut r = rand::thread_rng();
+
+    let mut peer_list = make_fake_peer_list_with_random_pruning_seeds(100);
+    peer_list.add_new_peer(make_fake_peer(101, Some(384)));
+
+    let peer = peer_list
+        .get_random_peer(&mut r, Some(1))
+        .expect("We just added a peer with the correct seed");
+
+    assert!(peer
+        .pruning_seed
+        .get_next_unpruned_block(1, 1_000_000)
+        .is_ok())
+}
+
+#[test]
+fn peer_list_ban_peers() {
+    let mut peer_list = make_fake_peer_list_with_random_pruning_seeds(100);
+    let peer = peer_list
+        .get_random_peer(&mut rand::thread_rng(), None)
+        .unwrap();
+    let ban_id = peer.adr.ban_id();
+
+    assert!(peer_list.contains_peer(&peer.adr));
+    assert_ne!(peer_list.ban_ids.get(&ban_id).unwrap().len(), 0);
+    peer_list.remove_peers_with_ban_id(&ban_id);
+    assert_eq!(peer_list.ban_ids.get(&ban_id), None);
+    for (addr, _) in peer_list.peers {
+        assert_ne!(addr.ban_id(), ban_id);
+    }
+}

p2p/address-book/src/store.rs

@@ -0,0 +1,92 @@
+use std::fs;
+
+use borsh::{from_slice, to_vec, BorshDeserialize, BorshSerialize};
+use tokio::task::{spawn_blocking, JoinHandle};
+
+use monero_p2p::{services::ZoneSpecificPeerListEntryBase, NetZoneAddress, NetworkZone};
+
+use crate::{peer_list::PeerList, Config};
+
+// TODO: store anchor and ban list.
+
+#[derive(BorshSerialize)]
+struct SerPeerDataV1<'a, A: NetZoneAddress> {
+    white_list: Vec<&'a ZoneSpecificPeerListEntryBase<A>>,
+    gray_list: Vec<&'a ZoneSpecificPeerListEntryBase<A>>,
+}
+
+#[derive(BorshDeserialize)]
+struct DeserPeerDataV1<A: NetZoneAddress> {
+    white_list: Vec<ZoneSpecificPeerListEntryBase<A>>,
+    gray_list: Vec<ZoneSpecificPeerListEntryBase<A>>,
+}
+
+pub fn save_peers_to_disk<Z: NetworkZone>(
+    cfg: &Config,
+    white_list: &PeerList<Z>,
+    gray_list: &PeerList<Z>,
+) -> JoinHandle<std::io::Result<()>> {
+    // maybe move this to another thread but that would require cloning the data ... this
+    // happens so infrequently that it's probably not worth it.
+    let data = to_vec(&SerPeerDataV1 {
+        white_list: white_list.peers.values().collect::<Vec<_>>(),
+        gray_list: gray_list.peers.values().collect::<Vec<_>>(),
+    })
+    .unwrap();
+
+    let file = cfg.peer_store_file.clone();
+    spawn_blocking(move || fs::write(&file, &data))
+}
+
+pub async fn read_peers_from_disk<Z: NetworkZone>(
+    cfg: &Config,
+) -> Result<
+    (
+        Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>,
+        Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>,
+    ),
+    std::io::Error,
+> {
+    let file = cfg.peer_store_file.clone();
+    let data = spawn_blocking(move || fs::read(file)).await.unwrap()?;
+
+    let de_ser: DeserPeerDataV1<Z::Addr> = from_slice(&data)?;
+    Ok((de_ser.white_list, de_ser.gray_list))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::peer_list::{tests::make_fake_peer_list, PeerList};
+
+    use cuprate_test_utils::test_netzone::{TestNetZone, TestNetZoneAddr};
+
+    #[test]
+    fn ser_deser_peer_list() {
+        let white_list = make_fake_peer_list(0, 50);
+        let gray_list = make_fake_peer_list(50, 100);
+
+        let data = to_vec(&SerPeerDataV1 {
+            white_list: white_list.peers.values().collect::<Vec<_>>(),
+            gray_list: gray_list.peers.values().collect::<Vec<_>>(),
+        })
+        .unwrap();
+
+        let de_ser: DeserPeerDataV1<TestNetZoneAddr> = from_slice(&data).unwrap();
+
+        let white_list_2: PeerList<TestNetZone<true, true, true>> =
+            PeerList::new(de_ser.white_list);
+        let gray_list_2: PeerList<TestNetZone<true, true, true>> = PeerList::new(de_ser.gray_list);
+
+        assert_eq!(white_list.peers.len(), white_list_2.peers.len());
+        assert_eq!(gray_list.peers.len(), gray_list_2.peers.len());
+
+        for addr in white_list.peers.keys() {
+            assert!(white_list_2.contains_peer(addr));
+        }
+
+        for addr in gray_list.peers.keys() {
+            assert!(gray_list_2.contains_peer(addr));
+        }
+    }
+}

p2p/monero-p2p/Cargo.toml

@@ -1,25 +1,29 @@
 [package]
-name = "monero-peer"
+name = "monero-p2p"
 version = "0.1.0"
 edition = "2021"
+license = "MIT"
+authors = ["Boog900"]
 
 [features]
-default = []
+default = ["borsh"]
+borsh = ["dep:borsh"]
 
 [dependencies]
 monero-wire = {path= "../../net/monero-wire"}
-cuprate-common = {path = "../../common"}
+cuprate-common = {path = "../../common", features = ["borsh"]}
 
 tokio = {version= "1.34.0", default-features = false, features = ["net"]}
 tokio-util = { version = "0.7.10", default-features = false, features = ["codec"] }
 futures = "0.3.29"
 async-trait = "0.1.74"
-
 tower = { version= "0.4.13", features = ["util"] }
-thiserror = "1.0.50"
 
+thiserror = "1.0.50"
 tracing = "0.1.40"
 
+borsh = {version = "1.2.1", default-features = false, features = ["derive", "std"], optional = true }
+
 [dev-dependencies]
 cuprate-test-utils = {path = "../../test-utils"}
 

p2p/monero-p2p/src/client.rs

@@ -0,0 +1,14 @@
+mod conector;
+mod connection;
+pub mod handshaker;
+
+pub use conector::{ConnectRequest, Connector};
+pub use handshaker::{DoHandshakeRequest, HandShaker, HandshakeError};
+
+/// An internal identifier for a given peer, will be their address if known
+/// or a random u64 if not.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum InternalPeerID<A> {
+    KnownAddr(A),
+    Unknown(u64),
+}

p2p/monero-p2p/src/client/conector.rs

@@ -47,7 +47,7 @@ where
         let mut handshaker = self.handshaker.clone();
 
         async move {
-            let (peer_stream, peer_sink) = Z::connect_to_peer(req.addr.clone()).await?;
+            let (peer_stream, peer_sink) = Z::connect_to_peer(req.addr).await?;
             let req = DoHandshakeRequest {
                 addr: req.addr,
                 peer_stream,

p2p/monero-p2p/src/client/connection.rs

@@ -41,7 +41,7 @@ impl State {
                         LevinCommand::NewTransactions
                     )
             ),
-            _ => false,
+            _ => panic!("We are not in a state to be checking responses!"),
         }
     }
 }

p2p/monero-p2p/src/client/handshaker.rs

@@ -31,7 +31,7 @@ pub enum HandshakeError {
     #[error("peer is on a different network")]
     IncorrectNetwork,
     #[error("peer sent a peer list with peers from different zones")]
-    PeerSentIncorrectZonePeerList(#[from] crate::NetworkAddressIncorrectZone),
+    PeerSentIncorrectPeerList(#[from] crate::services::PeerListConversionError),
     #[error("peer sent invalid message: {0}")]
     PeerSentInvalidMessage(&'static str),
     #[error("Levin bucket error: {0}")]
@@ -234,7 +234,9 @@ where
             .address_book
             .ready()
             .await?
-            .call(AddressBookRequest::GetPeers(MAX_PEERS_IN_PEER_LIST_MESSAGE))
+            .call(AddressBookRequest::GetWhitePeers(
+                MAX_PEERS_IN_PEER_LIST_MESSAGE,
+            ))
             .await?
         else {
             panic!("Address book sent incorrect response");

p2p/monero-p2p/src/handles.rs

@@ -0,0 +1,95 @@
+//!
+use std::time::Duration;
+
+use futures::{channel::mpsc, SinkExt};
+use tokio::sync::{OwnedSemaphorePermit, Semaphore};
+use tokio_util::sync::CancellationToken;
+
+#[derive(Default, Debug)]
+pub struct HandleBuilder {
+    permit: Option<OwnedSemaphorePermit>,
+}
+
+impl HandleBuilder {
+    pub fn with_permit(mut self, permit: OwnedSemaphorePermit) -> Self {
+        self.permit = Some(permit);
+        self
+    }
+
+    pub fn build(self) -> (ConnectionGuard, ConnectionHandle, PeerHandle) {
+        let token = CancellationToken::new();
+        let (tx, rx) = mpsc::channel(0);
+
+        (
+            ConnectionGuard {
+                token: token.clone(),
+                permit: self.permit.expect("connection permit was not set!"),
+            },
+            ConnectionHandle {
+                token: token.clone(),
+                ban: rx,
+            },
+            PeerHandle { ban: tx, token },
+        )
+    }
+}
+
+pub struct BanPeer(pub Duration);
+
+/// A struct given to the connection task.
+pub struct ConnectionGuard {
+    token: CancellationToken,
+    permit: OwnedSemaphorePermit,
+}
+
+impl ConnectionGuard {
+    pub fn should_shutdown(&self) -> bool {
+        self.token.is_cancelled()
+    }
+    pub fn connection_closed(&self) {
+        self.token.cancel()
+    }
+}
+
+impl Drop for ConnectionGuard {
+    fn drop(&mut self) {
+        self.token.cancel()
+    }
+}
+
+/// A handle given to a task that needs to close this connection and find out if the connection has
+/// been banned.
+pub struct ConnectionHandle {
+    token: CancellationToken,
+    ban: mpsc::Receiver<BanPeer>,
+}
+
+impl ConnectionHandle {
+    pub fn is_closed(&self) -> bool {
+        self.token.is_cancelled()
+    }
+    pub fn check_should_ban(&mut self) -> Option<BanPeer> {
+        match self.ban.try_next() {
+            Ok(res) => res,
+            Err(_) => None,
+        }
+    }
+    pub fn send_close_signal(&self) {
+        self.token.cancel()
+    }
+}
+
+/// A handle given to a task that needs to be able to ban a peer.
+#[derive(Clone)]
+pub struct PeerHandle {
+    token: CancellationToken,
+    ban: mpsc::Sender<BanPeer>,
+}
+
+impl PeerHandle {
+    pub fn ban_peer(&mut self, duration: Duration) {
+        // This channel won't be dropped and if it's full the peer has already been banned.
+        let _ = self.ban.try_send(BanPeer(duration));
+        self.token.cancel()
+    }
+}

p2p/monero-p2p/src/lib.rs

@@ -1,6 +1,6 @@
 #![allow(unused)]
 
-use std::{future::Future, pin::Pin};
+use std::{fmt::Debug, future::Future, hash::Hash, pin::Pin};
 
 use futures::{Sink, Stream};
 
@@ -10,6 +10,7 @@ use monero_wire::{
 
 pub mod client;
 pub mod error;
+pub mod handles;
 pub mod network_zones;
 pub mod protocol;
 pub mod services;
@@ -26,9 +27,63 @@ pub enum ConnectionDirection {
     OutBound,
 }
 
+#[cfg(not(feature = "borsh"))]
+pub trait NetZoneAddress:
+    TryFrom<NetworkAddress, Error = NetworkAddressIncorrectZone>
+    + Into<NetworkAddress>
+    + std::fmt::Display
+    + Hash
+    + Eq
+    + Clone
+    + Copy
+    + Send
+    + Unpin
+    + 'static
+{
+    /// Cuprate needs to be able to ban peers by IP addresses and not just by SocketAddr as
+    /// that include the port, to be able to facilitate this network addresses must have a ban ID
+    /// which for hidden services could just be the address it self but for clear net addresses will
+    /// be the IP address.
+    /// TODO: IP zone banning?
+    type BanID: Debug + Hash + Eq + Clone + Copy + Send + 'static;
+
+    fn ban_id(&self) -> Self::BanID;
+
+    fn should_add_to_peer_list(&self) -> bool;
+}
+
+#[cfg(feature = "borsh")]
+pub trait NetZoneAddress:
+    TryFrom<NetworkAddress, Error = NetworkAddressIncorrectZone>
+    + Into<NetworkAddress>
+    + std::fmt::Display
+    + borsh::BorshSerialize
+    + borsh::BorshDeserialize
+    + Hash
+    + Eq
+    + Clone
+    + Copy
+    + Send
+    + Unpin
+    + 'static
+{
+    /// Cuprate needs to be able to ban peers by IP addresses and not just by SocketAddr as
+    /// that include the port, to be able to facilitate this network addresses must have a ban ID
+    /// which for hidden services could just be the address it self but for clear net addresses will
+    /// be the IP address.
+    /// TODO: IP zone banning?
+    type BanID: Debug + Hash + Eq + Clone + Copy + Send + 'static;
+
+    fn ban_id(&self) -> Self::BanID;
+
+    fn should_add_to_peer_list(&self) -> bool;
+}
+
 /// An abstraction over a network zone (tor/i2p/clear)
 #[async_trait::async_trait]
-pub trait NetworkZone: Clone + Send + 'static {
+pub trait NetworkZone: Clone + Copy + Send + 'static {
+    /// The network name.
+    const NAME: &'static str;
     /// Allow syncing over this network.
     ///
     /// Not recommended for anonymity networks.
@@ -44,12 +99,8 @@ pub trait NetworkZone: Clone + Send + 'static {
     const CHECK_NODE_ID: bool;
 
     /// The address type of this network.
-    type Addr: TryFrom<NetworkAddress, Error = NetworkAddressIncorrectZone>
-        + Into<NetworkAddress>
-        + std::fmt::Display
-        + Clone
-        + Send
-        + 'static;
+    type Addr: NetZoneAddress;
+
     /// The stream (incoming data) type for this network.
     type Stream: Stream<Item = Result<Message, BucketError>> + Unpin + Send + 'static;
     /// The sink (outgoing data) type for this network.
@@ -69,33 +120,26 @@ pub(crate) trait AddressBook<Z: NetworkZone>:
         AddressBookRequest<Z>,
         Response = AddressBookResponse<Z>,
         Error = tower::BoxError,
-        Future = Pin<
-            Box<
-                dyn Future<Output = Result<AddressBookResponse<Z>, tower::BoxError>>
-                    + Send
-                    + 'static,
-            >,
-        >,
+        Future = Self::Future2,
     > + Send
     + 'static
 {
+    // This allows us to put more restrictive bounds on the future without defining the future here
+    // explicitly.
+    type Future2: Future<Output = Result<Self::Response, Self::Error>> + Send + 'static;
 }
 
-impl<T, Z: NetworkZone> AddressBook<Z> for T where
+impl<T, Z: NetworkZone> AddressBook<Z> for T
+where
     T: tower::Service<
             AddressBookRequest<Z>,
             Response = AddressBookResponse<Z>,
             Error = tower::BoxError,
-            Future = Pin<
-                Box<
-                    dyn Future<Output = Result<AddressBookResponse<Z>, tower::BoxError>>
-                        + Send
-                        + 'static,
-                >,
-            >,
         > + Send
-        + 'static
+        + 'static,
+    T::Future: Future<Output = Result<Self::Response, Self::Error>> + Send + 'static,
 {
+    type Future2 = T::Future;
 }
 
 pub(crate) trait CoreSyncSvc:

p2p/monero-p2p/src/network_zones/clear.rs

@@ -1,4 +1,4 @@
-use std::net::SocketAddr;
+use std::net::{IpAddr, SocketAddr};
 
 use monero_wire::MoneroWireCodec;
 
@@ -8,15 +8,28 @@ use tokio::net::{
 };
 use tokio_util::codec::{FramedRead, FramedWrite};
 
-use crate::NetworkZone;
+use crate::{NetZoneAddress, NetworkZone};
 
-#[derive(Clone)]
+impl NetZoneAddress for SocketAddr {
+    type BanID = IpAddr;
+
+    fn ban_id(&self) -> Self::BanID {
+        self.ip()
+    }
+
+    fn should_add_to_peer_list(&self) -> bool {
+        todo!()
+    }
+}
+
+#[derive(Clone, Copy)]
 pub struct ClearNet;
 
 pub struct ClearNetServerCfg {}
 
 #[async_trait::async_trait]
 impl NetworkZone for ClearNet {
+    const NAME: &'static str = "ClearNet";
     const ALLOW_SYNC: bool = true;
     const DANDELION_PP: bool = true;
     const CHECK_NODE_ID: bool = true;

p2p/monero-p2p/src/services.rs

@@ -0,0 +1,107 @@
+use cuprate_common::{PruningError, PruningSeed};
+use monero_wire::{NetZone, NetworkAddress, PeerListEntryBase};
+
+use crate::{
+    client::InternalPeerID, handles::ConnectionHandle, NetZoneAddress, NetworkAddressIncorrectZone,
+    NetworkZone,
+};
+
+pub enum CoreSyncDataRequest {
+    Ours,
+    HandleIncoming(monero_wire::CoreSyncData),
+}
+
+pub enum CoreSyncDataResponse {
+    Ours(monero_wire::CoreSyncData),
+    Ok,
+}
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
+pub struct ZoneSpecificPeerListEntryBase<A: NetZoneAddress> {
+    pub adr: A,
+    pub id: u64,
+    pub last_seen: i64,
+    pub pruning_seed: PruningSeed,
+    pub rpc_port: u16,
+    pub rpc_credits_per_hash: u32,
+}
+
+impl<A: NetZoneAddress> From<ZoneSpecificPeerListEntryBase<A>> for monero_wire::PeerListEntryBase {
+    fn from(value: ZoneSpecificPeerListEntryBase<A>) -> Self {
+        Self {
+            adr: value.adr.into(),
+            id: value.id,
+            last_seen: value.last_seen,
+            pruning_seed: value.pruning_seed.into(),
+            rpc_port: value.rpc_port,
+            rpc_credits_per_hash: value.rpc_credits_per_hash,
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum PeerListConversionError {
+    #[error("Address is in incorrect zone")]
+    Address(#[from] NetworkAddressIncorrectZone),
+    #[error("Pruning seed error: {0}")]
+    PruningSeed(#[from] PruningError),
+}
+
+impl<A: NetZoneAddress> TryFrom<monero_wire::PeerListEntryBase>
+    for ZoneSpecificPeerListEntryBase<A>
+{
+    type Error = PeerListConversionError;
+
+    fn try_from(value: PeerListEntryBase) -> Result<Self, Self::Error> {
+        Ok(Self {
+            adr: value.adr.try_into()?,
+            id: value.id,
+            last_seen: value.last_seen,
+            pruning_seed: PruningSeed::try_from(value.pruning_seed)?,
+            rpc_port: value.rpc_port,
+            rpc_credits_per_hash: value.rpc_credits_per_hash,
+        })
+    }
+}
+
+pub enum AddressBookRequest<Z: NetworkZone> {
+    NewConnection {
+        addr: Option<Z::Addr>,
+        internal_peer_id: InternalPeerID<Z::Addr>,
+        handle: ConnectionHandle,
+        id: u64,
+        pruning_seed: PruningSeed,
+        /// The peers port.
+        rpc_port: u16,
+        /// The peers rpc credits per hash
+        rpc_credits_per_hash: u32,
+    },
+    /// Bans a peer for the specified duration. This request
+    /// will send disconnect signals to all peers with the same
+    /// address.
+    BanPeer(Z::Addr, std::time::Duration),
+    IncomingPeerList(Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>),
+    /// Gets a random white peer from the peer list. If height is specified
+    /// then the peer list should retrieve a peer that should have a full
+    /// block at that height according to it's pruning seed
+    GetRandomWhitePeer {
+        height: Option<u64>,
+    },
+    /// Gets a random gray peer from the peer list. If height is specified
+    /// then the peer list should retrieve a peer that should have a full
+    /// block at that height according to it's pruning seed
+    GetRandomGrayPeer {
+        height: Option<u64>,
+    },
+    GetWhitePeers(usize),
+}
+
+pub enum AddressBookResponse<Z: NetworkZone> {
+    Ok,
+    Peer(ZoneSpecificPeerListEntryBase<Z::Addr>),
+    Peers(Vec<ZoneSpecificPeerListEntryBase<Z::Addr>>),
+}

p2p/monero-p2p/tests/handles.rs

@@ -0,0 +1,64 @@
+use std::{sync::Arc, time::Duration};
+
+use tokio::sync::Semaphore;
+
+use monero_p2p::handles::HandleBuilder;
+
+#[test]
+fn send_ban_signal() {
+    let semaphore = Arc::new(Semaphore::new(5));
+    let (guard, mut connection_handle, mut peer_handle) = HandleBuilder::default()
+        .with_permit(semaphore.try_acquire_owned().unwrap())
+        .build();
+
+    peer_handle.ban_peer(Duration::from_secs(300));
+
+    let Some(ban_time) = connection_handle.check_should_ban() else {
+        panic!("ban signal not received!");
+    };
+
+    assert_eq!(ban_time.0, Duration::from_secs(300));
+
+    connection_handle.send_close_signal();
+    assert!(guard.should_shutdown());
+
+    guard.connection_closed();
+    assert!(connection_handle.is_closed());
+}
+
+#[test]
+fn multiple_ban_signals() {
+    let semaphore = Arc::new(Semaphore::new(5));
+    let (guard, mut connection_handle, mut peer_handle) = HandleBuilder::default()
+        .with_permit(semaphore.try_acquire_owned().unwrap())
+        .build();
+
+    peer_handle.ban_peer(Duration::from_secs(300));
+    peer_handle.ban_peer(Duration::from_secs(301));
+    peer_handle.ban_peer(Duration::from_secs(302));
+
+    let Some(ban_time) = connection_handle.check_should_ban() else {
+        panic!("ban signal not received!");
+    };
+
+    // only the first will be seen
+    assert_eq!(ban_time.0, Duration::from_secs(300));
+
+    connection_handle.send_close_signal();
+    assert!(guard.should_shutdown());
+
+    guard.connection_closed();
+    assert!(connection_handle.is_closed());
+}
+
+#[test]
+fn dropped_guard_sends_disconnect_signal() {
+    let semaphore = Arc::new(Semaphore::new(5));
+    let (guard, connection_handle, _) = HandleBuilder::default()
+        .with_permit(semaphore.try_acquire_owned().unwrap())
+        .build();
+
+    assert!(!connection_handle.is_closed());
+    drop(guard);
+    assert!(connection_handle.is_closed());
+}

p2p/monero-p2p/tests/handshake.rs

@@ -6,7 +6,7 @@ use tower::{Service, ServiceExt};
 use cuprate_common::Network;
 use monero_wire::{common::PeerSupportFlags, BasicNodeData};
 
-use monero_peer::{
+use monero_p2p::{
     client::{ConnectRequest, Connector, DoHandshakeRequest, HandShaker},
     network_zones::ClearNet,
     ConnectionDirection,

p2p/monero-p2p/tests/utils.rs

@@ -7,7 +7,7 @@ use std::{
 use futures::FutureExt;
 use tower::Service;
 
-use monero_peer::{
+use monero_p2p::{
     services::{
         AddressBookRequest, AddressBookResponse, CoreSyncDataRequest, CoreSyncDataResponse,
     },
@@ -30,7 +30,7 @@ impl<Z: NetworkZone> Service<AddressBookRequest<Z>> for DummyAddressBook {
     fn call(&mut self, req: AddressBookRequest<Z>) -> Self::Future {
         async move {
             Ok(match req {
-                AddressBookRequest::GetPeers(_) => AddressBookResponse::Peers(vec![]),
+                AddressBookRequest::GetWhitePeers(_) => AddressBookResponse::Peers(vec![]),
                 _ => AddressBookResponse::Ok,
             })
         }

p2p/monero-peer/src/client.rs

@@ -1,6 +0,0 @@
-mod conector;
-mod connection;
-pub mod handshaker;
-
-pub use conector::{ConnectRequest, Connector};
-pub use handshaker::{DoHandshakeRequest, HandShaker, HandshakeError};

p2p/monero-peer/src/services.rs

@@ -1,61 +0,0 @@
-use monero_wire::PeerListEntryBase;
-
-use crate::{NetworkAddressIncorrectZone, NetworkZone};
-
-pub enum CoreSyncDataRequest {
-    Ours,
-    HandleIncoming(monero_wire::CoreSyncData),
-}
-
-pub enum CoreSyncDataResponse {
-    Ours(monero_wire::CoreSyncData),
-    Ok,
-}
-
-pub struct ZoneSpecificPeerListEntryBase<Z: NetworkZone> {
-    pub adr: Z::Addr,
-    pub id: u64,
-    pub last_seen: i64,
-    pub pruning_seed: u32,
-    pub rpc_port: u16,
-    pub rpc_credits_per_hash: u32,
-}
-
-impl<Z: NetworkZone> From<ZoneSpecificPeerListEntryBase<Z>> for monero_wire::PeerListEntryBase {
-    fn from(value: ZoneSpecificPeerListEntryBase<Z>) -> Self {
-        Self {
-            adr: value.adr.into(),
-            id: value.id,
-            last_seen: value.last_seen,
-            pruning_seed: value.pruning_seed,
-            rpc_port: value.rpc_port,
-            rpc_credits_per_hash: value.rpc_credits_per_hash,
-        }
-    }
-}
-
-impl<Z: NetworkZone> TryFrom<monero_wire::PeerListEntryBase> for ZoneSpecificPeerListEntryBase<Z> {
-    type Error = NetworkAddressIncorrectZone;
-
-    fn try_from(value: PeerListEntryBase) -> Result<Self, Self::Error> {
-        Ok(Self {
-            adr: value.adr.try_into()?,
-            id: value.id,
-            last_seen: value.last_seen,
-            pruning_seed: value.pruning_seed,
-            rpc_port: value.rpc_port,
-            rpc_credits_per_hash: value.rpc_credits_per_hash,
-        })
-    }
-}
-
-pub enum AddressBookRequest<Z: NetworkZone> {
-    NewConnection(Z::Addr, ZoneSpecificPeerListEntryBase<Z>),
-    IncomingPeerList(Vec<ZoneSpecificPeerListEntryBase<Z>>),
-    GetPeers(usize),
-}
-
-pub enum AddressBookResponse<Z: NetworkZone> {
-    Ok,
-    Peers(Vec<ZoneSpecificPeerListEntryBase<Z>>),
-}

p2p/src/address_book/address_book/peer_list.rs

@@ -62,15 +62,7 @@ impl PeerList {
     pub fn len(&self) -> usize {
         self.peers.len()
     }
-
-    /// Gets the amount of peers with a specific seed.
-    pub fn len_by_seed(&self, pruning_seed: &u32) -> usize {
-        self.pruning_idxs
-            .get(pruning_seed)
-            .map(|indexes| indexes.len())
-            .unwrap_or(0)
-    }
-
+    
     /// Adds a new peer to the peer list
     pub fn add_new_peer(&mut self, peer: PeerListEntryBase) {
         if let None = self.peers.insert(peer.adr, peer) {

p2p/src/connection_counter.rs

@@ -1,8 +1,3 @@
-//! Counting active connections used by Cuprate.
-//!
-//! These types can be used to count any kind of active resource.
-//! But they are currently used to track the number of open connections.
-
 use std::{fmt, sync::Arc};
 
 use tokio::sync::{OwnedSemaphorePermit, Semaphore};
@@ -127,4 +122,4 @@ impl Drop for ConnectionTracker {
         );
         // the permit is automatically dropped
     }
-}
+}

test-utils/Cargo.toml

@@ -5,7 +5,9 @@ edition = "2021"
 
 [dependencies]
 monero-wire = {path = "../net/monero-wire"}
-monero-peer = {path = "../p2p/monero-peer"}
+monero-p2p = {path = "../p2p/monero-p2p" }
 
 futures = "0.3.29"
-async-trait = "0.1.74"
+async-trait = "0.1.74"
+
+borsh = {version = "1.2.1", features = ["derive"]}

test-utils/src/test_netzone.rs

@@ -6,6 +6,7 @@ use std::{
     task::{Context, Poll},
 };
 
+use borsh::{BorshDeserialize, BorshSerialize};
 use futures::{channel::mpsc::Sender as InnerSender, stream::BoxStream, Sink};
 
 use monero_wire::{
@@ -13,11 +14,23 @@ use monero_wire::{
     BucketError, Message,
 };
 
-use monero_peer::NetworkZone;
+use monero_p2p::{NetZoneAddress, NetworkZone};
 
-#[derive(Clone)]
+#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq, BorshSerialize, BorshDeserialize)]
 pub struct TestNetZoneAddr(pub u32);
 
+impl NetZoneAddress for TestNetZoneAddr {
+    type BanID = Self;
+
+    fn ban_id(&self) -> Self::BanID {
+        *self
+    }
+
+    fn should_add_to_peer_list(&self) -> bool {
+        true
+    }
+}
+
 impl std::fmt::Display for TestNetZoneAddr {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         f.write_str(format!("test client, id: {}", self.0).as_str())
@@ -83,13 +96,14 @@ impl Sink<Message> for Sender {
     }
 }
 
-#[derive(Clone)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
 pub struct TestNetZone<const ALLOW_SYNC: bool, const DANDELION_PP: bool, const CHECK_NODE_ID: bool>;
 
 #[async_trait::async_trait]
 impl<const ALLOW_SYNC: bool, const DANDELION_PP: bool, const CHECK_NODE_ID: bool> NetworkZone
     for TestNetZone<ALLOW_SYNC, DANDELION_PP, CHECK_NODE_ID>
 {
+    const NAME: &'static str = "Testing";
     const ALLOW_SYNC: bool = ALLOW_SYNC;
     const DANDELION_PP: bool = DANDELION_PP;
     const CHECK_NODE_ID: bool = CHECK_NODE_ID;