Merge branch 'master' into rand-feature

.github/workflows/interop-test.yml

@@ -18,9 +18,23 @@ jobs:
         flavour: [chromium, native]
     steps:
       - uses: actions/checkout@v4
+
       - uses: docker/setup-buildx-action@v3
+
+      # This uses the same S3 cache as all test-plans images. Because we use `cargo-chef` in the Dockerfile, we have a layer available with all dependencies built.
       - name: Build ${{ matrix.flavour }} image
-        run: docker buildx build --load -t ${{ matrix.flavour }}-rust-libp2p-head . -f interop-tests/Dockerfile.${{ matrix.flavour }}
+        run: |
+          docker buildx build \
+            --load \
+            --cache-to   type=s3,mode=max,bucket=libp2p-by-tf-aws-bootstrap,region=us-east-1,prefix=buildCache,name=${{ matrix.flavour }}-rust-libp2p-head \
+            --cache-from type=s3,mode=max,bucket=libp2p-by-tf-aws-bootstrap,region=us-east-1,prefix=buildCache,name=${{ matrix.flavour }}-rust-libp2p-head \
+            -t ${{ matrix.flavour }}-rust-libp2p-head \
+            . \
+            -f interop-tests/Dockerfile.${{ matrix.flavour }}
+        env:
+          AWS_ACCESS_KEY_ID: ${{ vars.TEST_PLANS_BUILD_CACHE_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.TEST_PLANS_BUILD_CACHE_KEY }}
+
       - name: Run ${{ matrix.flavour }} tests
         uses: libp2p/test-plans/.github/actions/run-interop-ping-test@master
         with:

Cargo.lock

@@ -2252,23 +2252,23 @@ dependencies = [
 name = "ipfs-kad-example"
 version = "0.1.0"
 dependencies = [
- "async-std",
  "async-trait",
  "env_logger 0.10.0",
  "futures",
  "libp2p",
+ "tokio",
 ]
 
 [[package]]
 name = "ipfs-private-example"
 version = "0.1.0"
 dependencies = [
- "async-std",
  "async-trait",
  "either",
  "env_logger 0.10.0",
  "futures",
  "libp2p",
+ "tokio",
 ]
 
 [[package]]

examples/dcutr/src/main.rs

@@ -110,7 +110,6 @@ fn main() -> Result<(), Box<dyn Error>> {
     };
 
     #[derive(NetworkBehaviour)]
-    #[behaviour(to_swarm = "Event")]
     struct Behaviour {
         relay_client: relay::client::Behaviour,
         ping: ping::Behaviour,
@@ -118,39 +117,6 @@ fn main() -> Result<(), Box<dyn Error>> {
         dcutr: dcutr::Behaviour,
     }
 
-    #[derive(Debug)]
-    #[allow(clippy::large_enum_variant)]
-    enum Event {
-        Ping(ping::Event),
-        Identify(identify::Event),
-        Relay(relay::client::Event),
-        Dcutr(dcutr::Event),
-    }
-
-    impl From<ping::Event> for Event {
-        fn from(e: ping::Event) -> Self {
-            Event::Ping(e)
-        }
-    }
-
-    impl From<identify::Event> for Event {
-        fn from(e: identify::Event) -> Self {
-            Event::Identify(e)
-        }
-    }
-
-    impl From<relay::client::Event> for Event {
-        fn from(e: relay::client::Event) -> Self {
-            Event::Relay(e)
-        }
-    }
-
-    impl From<dcutr::Event> for Event {
-        fn from(e: dcutr::Event) -> Self {
-            Event::Dcutr(e)
-        }
-    }
-
     let behaviour = Behaviour {
         relay_client: client,
         ping: ping::Behaviour::new(ping::Config::new()),
@@ -207,12 +173,14 @@ fn main() -> Result<(), Box<dyn Error>> {
                 SwarmEvent::NewListenAddr { .. } => {}
                 SwarmEvent::Dialing { .. } => {}
                 SwarmEvent::ConnectionEstablished { .. } => {}
-                SwarmEvent::Behaviour(Event::Ping(_)) => {}
+                SwarmEvent::Behaviour(BehaviourEvent::Ping(_)) => {}
-                SwarmEvent::Behaviour(Event::Identify(identify::Event::Sent { .. })) => {
+                SwarmEvent::Behaviour(BehaviourEvent::Identify(identify::Event::Sent {
+                    ..
+                })) => {
                     info!("Told relay its public address.");
                     told_relay_observed_addr = true;
                 }
-                SwarmEvent::Behaviour(Event::Identify(identify::Event::Received {
+                SwarmEvent::Behaviour(BehaviourEvent::Identify(identify::Event::Received {
                     info: identify::Info { observed_addr, .. },
                     ..
                 })) => {
@@ -252,22 +220,22 @@ fn main() -> Result<(), Box<dyn Error>> {
                 SwarmEvent::NewListenAddr { address, .. } => {
                     info!("Listening on {:?}", address);
                 }
-                SwarmEvent::Behaviour(Event::Relay(
+                SwarmEvent::Behaviour(BehaviourEvent::RelayClient(
                     relay::client::Event::ReservationReqAccepted { .. },
                 )) => {
                     assert!(opts.mode == Mode::Listen);
                     info!("Relay accepted our reservation request.");
                 }
-                SwarmEvent::Behaviour(Event::Relay(event)) => {
+                SwarmEvent::Behaviour(BehaviourEvent::RelayClient(event)) => {
                     info!("{:?}", event)
                 }
-                SwarmEvent::Behaviour(Event::Dcutr(event)) => {
+                SwarmEvent::Behaviour(BehaviourEvent::Dcutr(event)) => {
                     info!("{:?}", event)
                 }
-                SwarmEvent::Behaviour(Event::Identify(event)) => {
+                SwarmEvent::Behaviour(BehaviourEvent::Identify(event)) => {
                     info!("{:?}", event)
                 }
-                SwarmEvent::Behaviour(Event::Ping(_)) => {}
+                SwarmEvent::Behaviour(BehaviourEvent::Ping(_)) => {}
                 SwarmEvent::ConnectionEstablished {
                     peer_id, endpoint, ..
                 } => {

examples/distributed-key-value-store/src/main.rs

@@ -49,37 +49,18 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     // We create a custom network behaviour that combines Kademlia and mDNS.
     #[derive(NetworkBehaviour)]
-    #[behaviour(to_swarm = "MyBehaviourEvent")]
+    struct Behaviour {
-    struct MyBehaviour {
         kademlia: kad::Behaviour<MemoryStore>,
         mdns: mdns::async_io::Behaviour,
     }
 
-    #[allow(clippy::large_enum_variant)]
-    enum MyBehaviourEvent {
-        Kademlia(kad::Event),
-        Mdns(mdns::Event),
-    }
-
-    impl From<kad::Event> for MyBehaviourEvent {
-        fn from(event: kad::Event) -> Self {
-            MyBehaviourEvent::Kademlia(event)
-        }
-    }
-
-    impl From<mdns::Event> for MyBehaviourEvent {
-        fn from(event: mdns::Event) -> Self {
-            MyBehaviourEvent::Mdns(event)
-        }
-    }
-
     // Create a swarm to manage peers and events.
     let mut swarm = {
         // Create a Kademlia behaviour.
         let store = MemoryStore::new(local_peer_id);
         let kademlia = kad::Behaviour::new(local_peer_id, store);
         let mdns = mdns::async_io::Behaviour::new(mdns::Config::default(), local_peer_id)?;
-        let behaviour = MyBehaviour { kademlia, mdns };
+        let behaviour = Behaviour { kademlia, mdns };
         SwarmBuilder::with_async_std_executor(transport, behaviour, local_peer_id).build()
     };
 
@@ -99,12 +80,12 @@ async fn main() -> Result<(), Box<dyn Error>> {
             SwarmEvent::NewListenAddr { address, .. } => {
                 println!("Listening in {address:?}");
             },
-            SwarmEvent::Behaviour(MyBehaviourEvent::Mdns(mdns::Event::Discovered(list))) => {
+            SwarmEvent::Behaviour(BehaviourEvent::Mdns(mdns::Event::Discovered(list))) => {
                 for (peer_id, multiaddr) in list {
                     swarm.behaviour_mut().kademlia.add_address(&peer_id, multiaddr);
                 }
             }
-            SwarmEvent::Behaviour(MyBehaviourEvent::Kademlia(kad::Event::OutboundQueryProgressed { result, ..})) => {
+            SwarmEvent::Behaviour(BehaviourEvent::Kademlia(kad::Event::OutboundQueryProgressed { result, ..})) => {
                 match result {
                     kad::QueryResult::GetProviders(Ok(kad::GetProvidersOk::FoundProviders { key, providers, .. })) => {
                         for peer in providers {

examples/file-sharing/src/network.rs

@@ -51,7 +51,7 @@ pub(crate) async fn new(
     // higher layer network behaviour logic.
     let mut swarm = SwarmBuilder::with_async_std_executor(
         transport,
-        ComposedBehaviour {
+        Behaviour {
             kademlia: kad::Behaviour::new(peer_id, kad::record::store::MemoryStore::new(peer_id)),
             request_response: request_response::cbor::Behaviour::new(
                 [(
@@ -171,7 +171,7 @@ impl Client {
 }
 
 pub(crate) struct EventLoop {
-    swarm: Swarm<ComposedBehaviour>,
+    swarm: Swarm<Behaviour>,
     command_receiver: mpsc::Receiver<Command>,
     event_sender: mpsc::Sender<Event>,
     pending_dial: HashMap<PeerId, oneshot::Sender<Result<(), Box<dyn Error + Send>>>>,
@@ -183,7 +183,7 @@ pub(crate) struct EventLoop {
 
 impl EventLoop {
     fn new(
-        swarm: Swarm<ComposedBehaviour>,
+        swarm: Swarm<Behaviour>,
         command_receiver: mpsc::Receiver<Command>,
         event_sender: mpsc::Sender<Event>,
     ) -> Self {
@@ -213,10 +213,10 @@ impl EventLoop {
 
     async fn handle_event(
         &mut self,
-        event: SwarmEvent<ComposedEvent, Either<void::Void, io::Error>>,
+        event: SwarmEvent<BehaviourEvent, Either<void::Void, io::Error>>,
     ) {
         match event {
-            SwarmEvent::Behaviour(ComposedEvent::Kademlia(
+            SwarmEvent::Behaviour(BehaviourEvent::Kademlia(
                 kad::Event::OutboundQueryProgressed {
                     id,
                     result: kad::QueryResult::StartProviding(_),
@@ -229,7 +229,7 @@ impl EventLoop {
                     .expect("Completed query to be previously pending.");
                 let _ = sender.send(());
             }
-            SwarmEvent::Behaviour(ComposedEvent::Kademlia(
+            SwarmEvent::Behaviour(BehaviourEvent::Kademlia(
                 kad::Event::OutboundQueryProgressed {
                     id,
                     result:
@@ -252,7 +252,7 @@ impl EventLoop {
                         .finish();
                 }
             }
-            SwarmEvent::Behaviour(ComposedEvent::Kademlia(
+            SwarmEvent::Behaviour(BehaviourEvent::Kademlia(
                 kad::Event::OutboundQueryProgressed {
                     result:
                         kad::QueryResult::GetProviders(Ok(
@@ -261,8 +261,8 @@ impl EventLoop {
                     ..
                 },
             )) => {}
-            SwarmEvent::Behaviour(ComposedEvent::Kademlia(_)) => {}
+            SwarmEvent::Behaviour(BehaviourEvent::Kademlia(_)) => {}
-            SwarmEvent::Behaviour(ComposedEvent::RequestResponse(
+            SwarmEvent::Behaviour(BehaviourEvent::RequestResponse(
                 request_response::Event::Message { message, .. },
             )) => match message {
                 request_response::Message::Request {
@@ -287,7 +287,7 @@ impl EventLoop {
                         .send(Ok(response.0));
                 }
             },
-            SwarmEvent::Behaviour(ComposedEvent::RequestResponse(
+            SwarmEvent::Behaviour(BehaviourEvent::RequestResponse(
                 request_response::Event::OutboundFailure {
                     request_id, error, ..
                 },
@@ -298,7 +298,7 @@ impl EventLoop {
                     .expect("Request to still be pending.")
                     .send(Err(Box::new(error)));
             }
-            SwarmEvent::Behaviour(ComposedEvent::RequestResponse(
+            SwarmEvent::Behaviour(BehaviourEvent::RequestResponse(
                 request_response::Event::ResponseSent { .. },
             )) => {}
             SwarmEvent::NewListenAddr { address, .. } => {
@@ -406,30 +406,11 @@ impl EventLoop {
 }
 
 #[derive(NetworkBehaviour)]
-#[behaviour(to_swarm = "ComposedEvent")]
+struct Behaviour {
-struct ComposedBehaviour {
     request_response: request_response::cbor::Behaviour<FileRequest, FileResponse>,
     kademlia: kad::Behaviour<kad::record::store::MemoryStore>,
 }
 
-#[derive(Debug)]
-enum ComposedEvent {
-    RequestResponse(request_response::Event<FileRequest, FileResponse>),
-    Kademlia(kad::Event),
-}
-
-impl From<request_response::Event<FileRequest, FileResponse>> for ComposedEvent {
-    fn from(event: request_response::Event<FileRequest, FileResponse>) -> Self {
-        ComposedEvent::RequestResponse(event)
-    }
-}
-
-impl From<kad::Event> for ComposedEvent {
-    fn from(event: kad::Event) -> Self {
-        ComposedEvent::Kademlia(event)
-    }
-}
-
 #[derive(Debug)]
 enum Command {
     StartListening {

examples/ipfs-kad/Cargo.toml

@@ -6,8 +6,8 @@ publish = false
 license = "MIT"
 
 [dependencies]
-async-std = { version = "1.12", features = ["attributes"] }
+tokio = { version = "1.12", features = ["rt-multi-thread", "macros"] }
 async-trait = "0.1"
 env_logger = "0.10"
 futures = "0.3.28"
-libp2p = { path = "../../libp2p", features = ["async-std", "dns", "kad", "noise", "tcp", "websocket", "yamux", "rsa"] }
+libp2p = { path = "../../libp2p", features = ["tokio", "dns", "kad", "noise", "tcp", "websocket", "yamux", "rsa"] }

examples/ipfs-kad/src/main.rs

@@ -24,9 +24,9 @@ use futures::StreamExt;
 use libp2p::kad;
 use libp2p::kad::record::store::MemoryStore;
 use libp2p::{
-    development_transport, identity,
+    identity,
     swarm::{SwarmBuilder, SwarmEvent},
-    PeerId,
+    tokio_development_transport, PeerId,
 };
 use std::{env, error::Error, time::Duration};
 
@@ -37,7 +37,7 @@ const BOOTNODES: [&str; 4] = [
     "QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt",
 ];
 
-#[async_std::main]
+#[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     env_logger::init();
 
@@ -46,7 +46,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     let local_peer_id = PeerId::from(local_key.public());
 
     // Set up a an encrypted DNS-enabled TCP Transport over the yamux protocol
-    let transport = development_transport(local_key).await?;
+    let transport = tokio_development_transport(local_key)?;
 
     // Create a swarm to manage peers and events.
     let mut swarm = {
@@ -63,7 +63,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
             behaviour.add_address(&peer.parse()?, "/dnsaddr/bootstrap.libp2p.io".parse()?);
         }
 
-        SwarmBuilder::with_async_std_executor(transport, behaviour, local_peer_id).build()
+        SwarmBuilder::with_tokio_executor(transport, behaviour, local_peer_id).build()
     };
 
     // Order Kademlia to search for a peer.

examples/ipfs-private/Cargo.toml

@@ -6,9 +6,9 @@ publish = false
 license = "MIT"
 
 [dependencies]
-async-std = { version = "1.12", features = ["attributes"] }
+tokio = { version = "1.32", features = ["rt-multi-thread", "macros", "io-std"] }
 async-trait = "0.1"
 either = "1.9"
 env_logger = "0.10"
 futures = "0.3.28"
-libp2p = { path = "../../libp2p", features = ["async-std", "gossipsub", "dns", "identify", "kad", "macros", "noise", "ping", "pnet", "tcp", "websocket", "yamux"] }
+libp2p = { path = "../../libp2p", features = ["tokio", "gossipsub", "dns", "identify", "kad", "macros", "noise", "ping", "pnet", "tcp", "websocket", "yamux"] }

examples/ipfs-private/src/main.rs

@@ -20,9 +20,8 @@
 
 #![doc = include_str!("../README.md")]
 
-use async_std::io;
 use either::Either;
-use futures::{prelude::*, select};
+use futures::prelude::*;
 use libp2p::{
     core::{muxing::StreamMuxerBox, transport, transport::upgrade::Version},
     gossipsub, identify, identity,
@@ -33,6 +32,7 @@ use libp2p::{
     tcp, yamux, Multiaddr, PeerId, Transport,
 };
 use std::{env, error::Error, fs, path::Path, str::FromStr, time::Duration};
+use tokio::{io, io::AsyncBufReadExt, select};
 
 /// Builds the transport that serves as a common ground for all connections.
 pub fn build_transport(
@@ -42,7 +42,7 @@ pub fn build_transport(
     let noise_config = noise::Config::new(&key_pair).unwrap();
     let yamux_config = yamux::Config::default();
 
-    let base_transport = tcp::async_io::Transport::new(tcp::Config::default().nodelay(true));
+    let base_transport = tcp::tokio::Transport::new(tcp::Config::default().nodelay(true));
     let maybe_encrypted = match psk {
         Some(psk) => Either::Left(
             base_transport.and_then(move |socket, _| PnetConfig::new(psk).handshake(socket)),
@@ -108,7 +108,7 @@ fn parse_legacy_multiaddr(text: &str) -> Result<Multiaddr, Box<dyn Error>> {
     Ok(res)
 }
 
-#[async_std::main]
+#[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     env_logger::init();
 
@@ -186,7 +186,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
         println!("Subscribing to {gossipsub_topic:?}");
         behaviour.gossipsub.subscribe(&gossipsub_topic).unwrap();
-        SwarmBuilder::with_async_std_executor(transport, behaviour, local_peer_id).build()
+        SwarmBuilder::with_tokio_executor(transport, behaviour, local_peer_id).build()
     };
 
     // Reach out to other nodes if specified
@@ -197,7 +197,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     }
 
     // Read full lines from stdin
-    let mut stdin = io::BufReader::new(io::stdin()).lines().fuse();
+    let mut stdin = io::BufReader::new(io::stdin()).lines();
 
     // Listen on all interfaces and whatever port the OS assigns
     swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse()?)?;
@@ -205,11 +205,11 @@ async fn main() -> Result<(), Box<dyn Error>> {
     // Kick it off
     loop {
         select! {
-            line = stdin.select_next_some() => {
+            Ok(Some(line)) = stdin.next_line() => {
                 if let Err(e) = swarm
                     .behaviour_mut()
                     .gossipsub
-                    .publish(gossipsub_topic.clone(), line.expect("Stdin not to close").as_bytes())
+                    .publish(gossipsub_topic.clone(), line.as_bytes())
                 {
                     println!("Publish error: {e:?}");
                 }

interop-tests/Dockerfile.chromium

@@ -1,28 +1,26 @@
-FROM rust:1.67.0 as builder
+# syntax=docker/dockerfile:1.5-labs
-
+FROM rust:1.67.0 as chef
-# Run with access to the target cache to speed up builds
-WORKDIR /workspace
-ADD . .
-
 RUN rustup target add wasm32-unknown-unknown
-
 RUN wget -q -O- https://github.com/rustwasm/wasm-pack/releases/download/v0.12.1/wasm-pack-v0.12.1-x86_64-unknown-linux-musl.tar.gz | tar -zx -C /usr/local/bin --strip-components 1 --wildcards "wasm-pack-*/wasm-pack"
 RUN wget -q -O- https://github.com/WebAssembly/binaryen/releases/download/version_115/binaryen-version_115-x86_64-linux.tar.gz | tar -zx -C /usr/local/bin --strip-components 2 --wildcards "binaryen-version_*/bin/wasm-opt"
+RUN wget -q -O- https://github.com/LukeMathWalker/cargo-chef/releases/download/v0.1.62/cargo-chef-x86_64-unknown-linux-gnu.tar.gz | tar -zx -C /usr/local/bin
+WORKDIR /app
 
-RUN --mount=type=cache,target=./target \
+FROM chef AS planner
-    --mount=type=cache,target=/usr/local/cargo/registry \
+COPY . .
-    wasm-pack build --target web interop-tests
+RUN cargo chef prepare --recipe-path recipe.json
 
-RUN --mount=type=cache,target=./target \
+FROM chef AS builder
-    --mount=type=cache,target=/usr/local/cargo/registry \
+COPY --from=planner /app/recipe.json recipe.json
-    cargo build --release --package interop-tests --bin wasm_ping
+# Build dependencies - this is the caching Docker layer!
-
+RUN cargo chef cook --release --package interop-tests --target wasm32-unknown-unknown --recipe-path recipe.json
-RUN --mount=type=cache,target=./target \
+RUN cargo chef cook --release --package interop-tests --bin wasm_ping --recipe-path recipe.json
-    mv ./target/release/wasm_ping /usr/local/bin/testplan
+# Build application
+COPY . .
+RUN wasm-pack build --target web interop-tests
+RUN cargo build --release --package interop-tests --bin wasm_ping
 
 FROM selenium/standalone-chrome:115.0
-COPY --from=builder /usr/local/bin/testplan /usr/local/bin/testplan
+COPY --from=builder /app/target/release/wasm_ping /usr/local/bin/testplan
-
 ENV RUST_BACKTRACE=1
-
 ENTRYPOINT ["testplan"]

interop-tests/Dockerfile.native

@@ -1,17 +1,21 @@
 # syntax=docker/dockerfile:1.5-labs
-FROM rust:1.67.0 as builder
+FROM rust:1.67.0 as chef
+RUN wget -q -O- https://github.com/LukeMathWalker/cargo-chef/releases/download/v0.1.62/cargo-chef-x86_64-unknown-linux-gnu.tar.gz | tar -zx -C /usr/local/bin
+WORKDIR /app
 
-# Run with access to the target cache to speed up builds
+FROM chef AS planner
-WORKDIR /workspace
+COPY . .
-ADD . .
+RUN cargo chef prepare --recipe-path recipe.json
-RUN --mount=type=cache,target=./target \
-    --mount=type=cache,target=/usr/local/cargo/registry \
-    cargo build --release --package interop-tests --bin native_ping
 
-RUN --mount=type=cache,target=./target \
+FROM chef AS builder
-    mv ./target/release/native_ping /usr/local/bin/testplan
+COPY --from=planner /app/recipe.json recipe.json
+# Build dependencies - this is the caching Docker layer!
+RUN cargo chef cook --release --package interop-tests --bin native_ping --recipe-path recipe.json
+# Build application
+COPY . .
+RUN cargo build --release --package interop-tests --bin native_ping
 
 FROM gcr.io/distroless/cc
-COPY --from=builder /usr/local/bin/testplan /usr/local/bin/testplan
+COPY --from=builder /app/target/release/native_ping /usr/local/bin/testplan
 ENV RUST_BACKTRACE=1
 ENTRYPOINT ["testplan"]

protocols/dcutr/tests/lib.rs

@@ -135,30 +135,12 @@ fn build_client() -> Swarm<Client> {
 }
 
 #[derive(NetworkBehaviour)]
-#[behaviour(to_swarm = "ClientEvent", prelude = "libp2p_swarm::derive_prelude")]
+#[behaviour(prelude = "libp2p_swarm::derive_prelude")]
 struct Client {
     relay: relay::client::Behaviour,
     dcutr: dcutr::Behaviour,
 }
 
-#[derive(Debug)]
-enum ClientEvent {
-    Relay(relay::client::Event),
-    Dcutr(dcutr::Event),
-}
-
-impl From<relay::client::Event> for ClientEvent {
-    fn from(event: relay::client::Event) -> Self {
-        ClientEvent::Relay(event)
-    }
-}
-
-impl From<dcutr::Event> for ClientEvent {
-    fn from(event: dcutr::Event) -> Self {
-        ClientEvent::Dcutr(event)
-    }
-}
-
 async fn wait_for_reservation(
     client: &mut Swarm<Client>,
     client_addr: Multiaddr,