udp: clean up common file, move some code to other files

aquatic_udp/src/lib/network.rs

@@ -1,3 +1,4 @@
+use std::collections::BTreeMap;
 use std::io::{Cursor, ErrorKind};
 use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
 use std::sync::{
@@ -7,19 +8,247 @@ use std::sync::{
 use std::time::{Duration, Instant};
 use std::vec::Drain;
 
-use aquatic_common::access_list::create_access_list_cache;
-use aquatic_common::ValidUntil;
 use crossbeam_channel::Receiver;
 use mio::net::UdpSocket;
 use mio::{Events, Interest, Poll, Token};
-use rand::prelude::{SeedableRng, StdRng};
+use rand::prelude::{SeedableRng, StdRng, Rng};
 
-use aquatic_udp_protocol::{Request, Response};
+use aquatic_common::access_list::create_access_list_cache;
+use aquatic_common::ValidUntil;
+use aquatic_common::access_list::AccessListCache;
+use aquatic_common::AHashIndexMap;
+use aquatic_udp_protocol::*;
+use socket2::{Domain, Protocol, Socket, Type};
 
-use crate::common::network::*;
 use crate::common::*;
 use crate::config::Config;
 
+#[derive(Default)]
+pub struct ConnectionMap(AHashIndexMap<(ConnectionId, SocketAddr), ValidUntil>);
+
+impl ConnectionMap {
+    pub fn insert(
+        &mut self,
+        connection_id: ConnectionId,
+        socket_addr: SocketAddr,
+        valid_until: ValidUntil,
+    ) {
+        self.0.insert((connection_id, socket_addr), valid_until);
+    }
+
+    pub fn contains(&self, connection_id: ConnectionId, socket_addr: SocketAddr) -> bool {
+        self.0.contains_key(&(connection_id, socket_addr))
+    }
+
+    pub fn clean(&mut self) {
+        let now = Instant::now();
+
+        self.0.retain(|_, v| v.0 > now);
+        self.0.shrink_to_fit();
+    }
+}
+
+pub struct PendingScrapeResponseMeta {
+    num_pending: usize,
+    valid_until: ValidUntil,
+}
+
+#[derive(Default)]
+pub struct PendingScrapeResponseMap(
+    AHashIndexMap<TransactionId, (PendingScrapeResponseMeta, PendingScrapeResponse)>,
+);
+
+impl PendingScrapeResponseMap {
+    pub fn prepare(
+        &mut self,
+        transaction_id: TransactionId,
+        num_pending: usize,
+        valid_until: ValidUntil,
+    ) {
+        let meta = PendingScrapeResponseMeta {
+            num_pending,
+            valid_until,
+        };
+        let response = PendingScrapeResponse {
+            transaction_id,
+            torrent_stats: BTreeMap::new(),
+        };
+
+        self.0.insert(transaction_id, (meta, response));
+    }
+
+    pub fn add_and_get_finished(&mut self, response: PendingScrapeResponse) -> Option<Response> {
+        let finished = if let Some(r) = self.0.get_mut(&response.transaction_id) {
+            r.0.num_pending -= 1;
+
+            r.1.torrent_stats.extend(response.torrent_stats.into_iter());
+
+            r.0.num_pending == 0
+        } else {
+            ::log::warn!("PendingScrapeResponses.add didn't find PendingScrapeResponse in map");
+
+            false
+        };
+
+        if finished {
+            let response = self.0.remove(&response.transaction_id).unwrap().1;
+
+            Some(Response::Scrape(ScrapeResponse {
+                transaction_id: response.transaction_id,
+                torrent_stats: response.torrent_stats.into_values().collect(),
+            }))
+        } else {
+            None
+        }
+    }
+
+    pub fn clean(&mut self) {
+        let now = Instant::now();
+
+        self.0.retain(|_, v| v.0.valid_until.0 > now);
+        self.0.shrink_to_fit();
+    }
+}
+
+pub fn handle_request(
+    config: &Config,
+    connections: &mut ConnectionMap,
+    pending_scrape_responses: &mut PendingScrapeResponseMap,
+    access_list_cache: &mut AccessListCache,
+    rng: &mut StdRng,
+    request_sender: &ConnectedRequestSender,
+    local_responses: &mut Vec<(Response, SocketAddr)>,
+    valid_until: ValidUntil,
+    res_request: Result<Request, RequestParseError>,
+    src: SocketAddr,
+) {
+    let access_list_mode = config.access_list.mode;
+
+    match res_request {
+        Ok(Request::Connect(request)) => {
+            let connection_id = ConnectionId(rng.gen());
+
+            connections.insert(connection_id, src, valid_until);
+
+            let response = Response::Connect(ConnectResponse {
+                connection_id,
+                transaction_id: request.transaction_id,
+            });
+
+            local_responses.push((response, src))
+        }
+        Ok(Request::Announce(request)) => {
+            if connections.contains(request.connection_id, src) {
+                if access_list_cache
+                    .load()
+                    .allows(access_list_mode, &request.info_hash.0)
+                {
+                    let worker_index =
+                        RequestWorkerIndex::from_info_hash(config, request.info_hash);
+
+                    request_sender.try_send_to(
+                        worker_index,
+                        ConnectedRequest::Announce(request),
+                        src,
+                    );
+                } else {
+                    let response = Response::Error(ErrorResponse {
+                        transaction_id: request.transaction_id,
+                        message: "Info hash not allowed".into(),
+                    });
+
+                    local_responses.push((response, src))
+                }
+            }
+        }
+        Ok(Request::Scrape(request)) => {
+            if connections.contains(request.connection_id, src) {
+                let mut requests: AHashIndexMap<RequestWorkerIndex, PendingScrapeRequest> =
+                    Default::default();
+
+                let transaction_id = request.transaction_id;
+
+                for (i, info_hash) in request.info_hashes.into_iter().enumerate() {
+                    let pending = requests
+                        .entry(RequestWorkerIndex::from_info_hash(&config, info_hash))
+                        .or_insert_with(|| PendingScrapeRequest {
+                            transaction_id,
+                            info_hashes: BTreeMap::new(),
+                        });
+
+                    pending.info_hashes.insert(i, info_hash);
+                }
+
+                pending_scrape_responses.prepare(transaction_id, requests.len(), valid_until);
+
+                for (request_worker_index, request) in requests {
+                    request_sender.try_send_to(
+                        request_worker_index,
+                        ConnectedRequest::Scrape(request),
+                        src,
+                    );
+                }
+            }
+        }
+        Err(err) => {
+            ::log::debug!("Request::from_bytes error: {:?}", err);
+
+            if let RequestParseError::Sendable {
+                connection_id,
+                transaction_id,
+                err,
+            } = err
+            {
+                if connections.contains(connection_id, src) {
+                    let response = ErrorResponse {
+                        transaction_id,
+                        message: err.right_or("Parse error").into(),
+                    };
+
+                    local_responses.push((response.into(), src));
+                }
+            }
+        }
+    }
+}
+
+pub fn create_socket(config: &Config) -> ::std::net::UdpSocket {
+    let socket = if config.network.address.is_ipv4() {
+        Socket::new(Domain::IPV4, Type::DGRAM, Some(Protocol::UDP))
+    } else {
+        Socket::new(Domain::IPV6, Type::DGRAM, Some(Protocol::UDP))
+    }
+    .expect("create socket");
+
+    if config.network.only_ipv6 {
+        socket.set_only_v6(true).expect("socket: set only ipv6");
+    }
+
+    socket.set_reuse_port(true).expect("socket: set reuse port");
+
+    socket
+        .set_nonblocking(true)
+        .expect("socket: set nonblocking");
+
+    socket
+        .bind(&config.network.address.into())
+        .unwrap_or_else(|err| panic!("socket: bind to {}: {:?}", config.network.address, err));
+
+    let recv_buffer_size = config.network.socket_recv_buffer_size;
+
+    if recv_buffer_size != 0 {
+        if let Err(err) = socket.set_recv_buffer_size(recv_buffer_size) {
+            ::log::error!(
+                "socket: failed setting recv buffer to {}: {:?}",
+                recv_buffer_size,
+                err
+            );
+        }
+    }
+
+    socket.into()
+}
+
 pub fn run_socket_worker(
     state: State,
     config: Config,