feat(swarm): log local peer id on swarm creation

Closes https://github.com/libp2p/rust-libp2p/issues/4394.

Pull-Request: #4439.

Cargo.lock

@@ -1968,6 +1968,7 @@ version = "0.1.0"
 dependencies = [
  "async-std",
  "async-trait",
+ "env_logger 0.10.0",
  "futures",
  "libp2p",
 ]
@@ -3834,6 +3835,7 @@ version = "0.1.0"
 dependencies = [
  "async-std",
  "async-trait",
+ "env_logger 0.10.0",
  "futures",
  "libp2p",
 ]

examples/autonat/src/bin/autonat_client.rs

@@ -51,7 +51,6 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     let local_key = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(local_key.public());
-    println!("Local peer id: {local_peer_id:?}");
 
     let transport = tcp::async_io::Transport::default()
         .upgrade(Version::V1Lazy)

examples/autonat/src/bin/autonat_server.rs

@@ -43,7 +43,6 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     let local_key = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(local_key.public());
-    println!("Local peer id: {local_peer_id:?}");
 
     let transport = tcp::async_io::Transport::default()
         .upgrade(Version::V1Lazy)

examples/chat-example/src/main.rs

@@ -44,9 +44,9 @@ struct MyBehaviour {
 #[async_std::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     // Create a random PeerId
+    env_logger::init();
     let id_keys = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(id_keys.public());
-    println!("Local peer id: {local_peer_id}");
 
     // Set up an encrypted DNS-enabled TCP Transport over the yamux protocol.
     let tcp_transport = tcp::async_io::Transport::new(tcp::Config::default().nodelay(true))

examples/dcutr/src/main.rs

@@ -87,7 +87,6 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     let local_key = generate_ed25519(opts.secret_key_seed);
     let local_peer_id = PeerId::from(local_key.public());
-    info!("Local peer id: {:?}", local_peer_id);
 
     let (relay_transport, client) = relay::client::new(local_peer_id);
 

examples/identify/Cargo.toml

@@ -8,5 +8,6 @@ license = "MIT"
 [dependencies]
 async-std = { version = "1.12", features = ["attributes"] }
 async-trait = "0.1"
+env_logger = "0.10"
 futures = "0.3.28"
 libp2p = { path = "../../libp2p", features = ["async-std", "dns", "dcutr", "identify", "macros", "noise", "ping", "relay", "rendezvous", "tcp", "tokio", "yamux"] }

examples/identify/src/main.rs

@@ -31,9 +31,9 @@ use std::error::Error;
 
 #[async_std::main]
 async fn main() -> Result<(), Box<dyn Error>> {
+    env_logger::init();
     let local_key = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(local_key.public());
-    println!("Local peer id: {local_peer_id:?}");
 
     let transport = tcp::async_io::Transport::default()
         .upgrade(Version::V1Lazy)

examples/metrics/src/main.rs

@@ -41,7 +41,6 @@ fn main() -> Result<(), Box<dyn Error>> {
     let local_key = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(local_key.public());
     let local_pub_key = local_key.public();
-    info!("Local peer id: {local_peer_id:?}");
 
     let mut swarm = SwarmBuilder::without_executor(
         tcp::async_io::Transport::default()

examples/ping-example/Cargo.toml

@@ -8,5 +8,6 @@ license = "MIT"
 [dependencies]
 async-std = { version = "1.12", features = ["attributes"] }
 async-trait = "0.1"
+env_logger = "0.10.0"
 futures = "0.3.28"
 libp2p = { path = "../../libp2p", features = ["async-std", "dns", "macros", "noise", "ping", "tcp", "websocket", "yamux"] }

examples/ping-example/src/main.rs

@@ -31,9 +31,9 @@ use std::error::Error;
 
 #[async_std::main]
 async fn main() -> Result<(), Box<dyn Error>> {
+    env_logger::init();
     let local_key = identity::Keypair::generate_ed25519();
     let local_peer_id = PeerId::from(local_key.public());
-    println!("Local peer id: {local_peer_id:?}");
 
     let transport = tcp::async_io::Transport::default()
         .upgrade(Version::V1Lazy)

examples/relay-server/src/main.rs

@@ -47,7 +47,6 @@ fn main() -> Result<(), Box<dyn Error>> {
     // Create a static known PeerId based on given secret
     let local_key: identity::Keypair = generate_ed25519(opt.secret_key_seed);
     let local_peer_id = PeerId::from(local_key.public());
-    println!("Local peer id: {local_peer_id:?}");
 
     let tcp_transport = tcp::async_io::Transport::default();
 

examples/rendezvous/src/bin/rzv-discover.rs

@@ -56,8 +56,6 @@ async fn main() {
     )
     .build();
 
-    log::info!("Local peer id: {}", swarm.local_peer_id());
-
     swarm.dial(rendezvous_point_address.clone()).unwrap();
 
     let mut discover_tick = tokio::time::interval(Duration::from_secs(30));

examples/rendezvous/src/bin/rzv-identify.rs

@@ -56,8 +56,6 @@ async fn main() {
     )
     .build();
 
-    log::info!("Local peer id: {}", swarm.local_peer_id());
-
     let _ = swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse().unwrap());
 
     swarm.dial(rendezvous_point_address.clone()).unwrap();

examples/rendezvous/src/bin/rzv-register.rs

@@ -57,8 +57,6 @@ async fn main() {
     let external_address = "/ip4/127.0.0.1/tcp/0".parse::<Multiaddr>().unwrap();
     swarm.add_external_address(external_address);
 
-    log::info!("Local peer id: {}", swarm.local_peer_id());
-
     swarm.dial(rendezvous_point_address.clone()).unwrap();
 
     while let Some(event) = swarm.next().await {

examples/rendezvous/src/main.rs

@@ -54,8 +54,6 @@ async fn main() {
     )
     .build();
 
-    log::info!("Local peer id: {}", swarm.local_peer_id());
-
     let _ = swarm.listen_on("/ip4/0.0.0.0/tcp/62649".parse().unwrap());
 
     while let Some(event) = swarm.next().await {

libp2p/src/tutorials/ping.rs

@@ -57,6 +57,7 @@
 //!    [dependencies]
 //!        libp2p = { version = "0.50", features = ["tcp", "dns", "async-std", "noise", "yamux", "websocket", "ping", "macros"] }
 //!        futures = "0.3.21"
+//!        env_logger = "0.10.0"
 //!        async-std = { version = "1.12.0", features = ["attributes"] }
 //!    ```
 //!
@@ -177,7 +178,11 @@
 //! carried out by a [`Swarm`]. Put simply, a [`Swarm`] drives both a
 //! [`Transport`] and a [`NetworkBehaviour`] forward, passing commands from the
 //! [`NetworkBehaviour`] to the [`Transport`] as well as events from the
-//! [`Transport`] to the [`NetworkBehaviour`].
+//! [`Transport`] to the [`NetworkBehaviour`]. As you can see, after [`Swarm`] initialization, we
+//! removed the print of the local [`PeerId`](crate::PeerId) because every time a [`Swarm`] is
+//! created, it prints the local [`PeerId`](crate::PeerId) in the logs at the INFO level. In order
+//! to continue to see the local [`PeerId`](crate::PeerId) you must initialize the logger
+//! (In our example, `env_logger` is used)
 //!
 //! ```rust
 //! use libp2p::swarm::{keep_alive, NetworkBehaviour, SwarmBuilder};
@@ -186,9 +191,9 @@
 //!
 //! #[async_std::main]
 //! async fn main() -> Result<(), Box<dyn Error>> {
+//!     env_logger::init();
 //!     let local_key = identity::Keypair::generate_ed25519();
 //!     let local_peer_id = PeerId::from(local_key.public());
-//!     println!("Local peer id: {local_peer_id:?}");
 //!
 //!     let transport = libp2p::development_transport(local_key).await?;
 //!
@@ -243,9 +248,9 @@
 //!
 //! #[async_std::main]
 //! async fn main() -> Result<(), Box<dyn Error>> {
+//!     env_logger::init();
 //!     let local_key = identity::Keypair::generate_ed25519();
 //!     let local_peer_id = PeerId::from(local_key.public());
-//!     println!("Local peer id: {local_peer_id:?}");
 //!
 //!     let transport = libp2p::development_transport(local_key).await?;
 //!
@@ -293,9 +298,9 @@
 //!
 //! #[async_std::main]
 //! async fn main() -> Result<(), Box<dyn Error>> {
+//!     env_logger::init();
 //!     let local_key = identity::Keypair::generate_ed25519();
 //!     let local_peer_id = PeerId::from(local_key.public());
-//!     println!("Local peer id: {local_peer_id:?}");
 //!
 //!     let transport = libp2p::development_transport(local_key).await?;
 //!
@@ -349,9 +354,8 @@
 //! cargo run --example ping
 //! ```
 //!
-//! It will print the PeerId and the new listening addresses, e.g.
+//! It will print the new listening addresses, e.g.
 //! ```sh
-//! Local peer id: PeerId("12D3KooWT1As4mwh3KYBnNTw9bSrRbYQGJTm9SSte82JSumqgCQG")
 //! Listening on "/ip4/127.0.0.1/tcp/24915"
 //! Listening on "/ip4/192.168.178.25/tcp/24915"
 //! Listening on "/ip4/172.17.0.1/tcp/24915"

misc/server/src/main.rs

@@ -79,7 +79,6 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
         (peer_id, keypair)
     };
-    info!("Local peer id: {local_peer_id}");
 
     let transport = {
         let tcp_transport =

swarm/src/lib.rs

@@ -1520,6 +1520,7 @@ where
 
     /// Builds a `Swarm` with the current configuration.
     pub fn build(self) -> Swarm<TBehaviour> {
+        log::info!("Local peer id: {}", self.local_peer_id);
         Swarm {
             local_peer_id: self.local_peer_id,
             transport: self.transport,