Struct GossipSender 

pub struct GossipSender { /* private fields */ }

Gossip sender that broadcasts messages to peers.

Provides methods for broadcasting to all peers or just direct neighbors, with peer joining capabilities for topology management.

Implementations

impl GossipSender

pub fn new(gossip_sender: GossipSender, gossip: Gossip) -> Self

Create a new gossip sender from an iroh topic sender.

pub async fn broadcast(&self, data: Vec<u8>) -> Result<()>

Broadcast a message to all peers in the topic.

Examples found in repository

examples/e2e_test.rs (line 52)

async fn main() -> Result<()> {
    // Generate a new random secret key
    let secret_key = SecretKey::generate(&mut rand::rng());

    // Set up endpoint with discovery enabled
    let endpoint = Endpoint::builder()
        .secret_key(secret_key.clone())
        .discovery_n0()
        .bind()
        .await?;

    // Initialize gossip with auto-discovery
    let gossip = Gossip::builder().spawn(endpoint.clone());

    // Set up protocol router
    let _router = iroh::protocol::Router::builder(endpoint.clone())
        .accept(iroh_gossip::ALPN, gossip.clone())
        .spawn();

    let topic_id = TopicId::new("my-iroh-gossip-topic".to_string());
    let initial_secret = b"my-initial-secret".to_vec();

    let record_publisher = RecordPublisher::new(
        topic_id.clone(),
        endpoint.node_id().public(),
        secret_key.secret().clone(),
        None,
        initial_secret,
    );
    let (gossip_sender, gossip_receiver) = gossip
        .subscribe_and_join_with_auto_discovery(record_publisher)
        .await?
        .split()
        .await?;

    tokio::spawn(async move {
        while let Some(Ok(event)) = gossip_receiver.next().await {
            println!("event: {event:?}");
        }
    });

    tokio::time::sleep(std::time::Duration::from_secs(3)).await;
    gossip_sender
        .broadcast(format!("hi from {}", endpoint.node_id()).into())
        .await?;

    println!("[joined topic]");

    tokio::time::sleep(std::time::Duration::from_secs(10)).await;

    println!("[finished]");

    // successfully joined
    // exit with code 0
    Ok(())
}

examples/chat_no_wait.rs (line 68)

async fn main() -> Result<()> {
    // Generate a new random secret key
    let secret_key = SecretKey::generate(&mut rand::rng());

    // Set up endpoint with discovery enabled
    let endpoint = Endpoint::builder()
        .secret_key(secret_key.clone())
        .discovery_n0()
        .bind()
        .await?;

    // Initialize gossip with auto-discovery
    let gossip = Gossip::builder().spawn(endpoint.clone());

    // Set up protocol router
    let _router = iroh::protocol::Router::builder(endpoint.clone())
        .accept(iroh_gossip::ALPN, gossip.clone())
        .spawn();

    let topic_id = TopicId::new("my-iroh-gossip-topic".to_string());
    let initial_secret = b"my-initial-secret".to_vec();

    let record_publisher = RecordPublisher::new(
        topic_id.clone(),
        endpoint.node_id().public(),
        secret_key.secret().clone(),
        None,
        initial_secret,
    );
    let (gossip_sender, gossip_receiver) = gossip
        .subscribe_and_join_with_auto_discovery_no_wait(record_publisher)
        .await?
        .split()
        .await?;

    println!("Joined topic");

    // Spawn listener for incoming messages
    tokio::spawn(async move {
        while let Some(Ok(event)) = gossip_receiver.next().await {
            if let Event::Received(msg) = event {
                println!(
                    "\nMessage from {}: {}",
                    &msg.delivered_from.to_string()[0..8],
                    String::from_utf8(msg.content.to_vec()).unwrap()
                );
            } else if let Event::NeighborUp(peer) = event {
                println!("\nJoined by {}", &peer.to_string()[0..8]);
            }
        }
    });

    // Main input loop for sending messages
    let mut buffer = String::new();
    let stdin = std::io::stdin();
    loop {
        print!("\n> ");
        stdin.read_line(&mut buffer).unwrap();
        gossip_sender
            .broadcast(buffer.clone().replace("\n", "").into())
            .await
            .unwrap();
        println!(" - (sent)");
        buffer.clear();
    }
}

examples/secret_rotation.rs (line 90)

async fn main() -> Result<()> {
    // Generate a new random secret key
    let secret_key = SecretKey::generate(&mut rand::rng());

    // Set up endpoint with discovery enabled
    let endpoint = Endpoint::builder()
        .secret_key(secret_key.clone())
        .discovery_n0()
        .bind()
        .await?;

    // Initialize gossip with auto-discovery
    let gossip = Gossip::builder().spawn(endpoint.clone());

    // Set up protocol router
    let _router = iroh::protocol::Router::builder(endpoint.clone())
        .accept(iroh_gossip::ALPN, gossip.clone())
        .spawn();

    let topic_id = TopicId::new("my-iroh-gossip-topic".to_string());
    let initial_secret = b"my-initial-secret".to_vec();

    // Split into sink (sending) and stream (receiving)

    let record_publisher = RecordPublisher::new(
        topic_id.clone(),
        endpoint.node_id().public(),
        secret_key.secret().clone(),
        Some(RotationHandle::new(MySecretRotation)),
        initial_secret,
    );
    let (gossip_sender, gossip_receiver) = gossip
        .subscribe_and_join_with_auto_discovery(record_publisher)
        .await?
        .split()
        .await?;

    println!("Joined topic");

    // Spawn listener for incoming messages
    tokio::spawn(async move {
        while let Some(Ok(event)) = gossip_receiver.next().await {
            if let Event::Received(msg) = event {
                println!(
                    "\nMessage from {}: {}",
                    &msg.delivered_from.to_string()[0..8],
                    String::from_utf8(msg.content.to_vec()).unwrap()
                );
            } else if let Event::NeighborUp(peer) = event {
                println!("\nJoined by {}", &peer.to_string()[0..8]);
            }
        }
    });

    // Main input loop for sending messages
    let mut buffer = String::new();
    let stdin = std::io::stdin();
    loop {
        print!("\n> ");
        stdin.read_line(&mut buffer).unwrap();
        gossip_sender
            .broadcast(buffer.clone().replace("\n", "").into())
            .await
            .unwrap();
        println!(" - (sent)");
        buffer.clear();
    }
}

examples/chat.rs (line 83)

async fn main() -> Result<()> {

    // tracing init - only show distributed_topic_tracker logs
    use tracing_subscriber::filter::EnvFilter;
    
    tracing_subscriber::fmt()
        .with_thread_ids(true)
        .with_ansi(true)
        .with_env_filter(
            EnvFilter::try_from_default_env()
                .unwrap_or_else(|_| EnvFilter::new("distributed_topic_tracker=debug"))
        )
        .init();

    // Generate a new random secret key
    let secret_key = SecretKey::generate(&mut rand::rng());

    // Set up endpoint with discovery enabled
    let endpoint = Endpoint::builder()
        .secret_key(secret_key.clone())
        .discovery_n0()
        .bind()
        .await?;

    // Initialize gossip with auto-discovery
    let gossip = Gossip::builder().spawn(endpoint.clone());

    // Set up protocol router
    let _router = iroh::protocol::Router::builder(endpoint.clone())
        .accept(iroh_gossip::ALPN, gossip.clone())
        .spawn();

    let topic_id = TopicId::new("my-iroh-gossip-topic".to_string());
    let initial_secret = b"my-initial-secret".to_vec();

    let record_publisher = RecordPublisher::new(
        topic_id.clone(),
        endpoint.node_id().public(),
        secret_key.secret().clone(),
        None,
        initial_secret,
    );

    // Split into sink (sending) and stream (receiving)
    let (gossip_sender, gossip_receiver) = gossip
        .subscribe_and_join_with_auto_discovery(record_publisher)
        .await?
        .split()
        .await?;

    println!("Joined topic");

    // Spawn listener for incoming messages
    tokio::spawn(async move {
        while let Some(Ok(event)) = gossip_receiver.next().await {
            if let Event::Received(msg) = event {
                println!(
                    "\nMessage from {}: {}",
                    &msg.delivered_from.to_string()[0..8],
                    String::from_utf8(msg.content.to_vec()).unwrap()
                );
            } else if let Event::NeighborUp(peer) = event {
                println!("\nJoined by {}", &peer.to_string()[0..8]);
            }
        }
    });

    // Main input loop for sending messages
    let mut buffer = String::new();
    let stdin = std::io::stdin();
    loop {
        print!("\n> ");
        stdin.read_line(&mut buffer).unwrap();
        gossip_sender
            .broadcast(buffer.clone().replace("\n", "").into())
            .await
            .unwrap();
        println!(" - (sent)");
        buffer.clear();
    }
}

pub async fn broadcast_neighbors(&self, data: Vec<u8>) -> Result<()>

Broadcast a message only to direct neighbors.

pub async fn join_peers( &self, peers: Vec<NodeId>, max_peers: Option<usize>, ) -> Result<()>

Join specific peer nodes.

Arguments

• peers - List of node IDs to join
• max_peers - Optional maximum number of peers to join (randomly selected if exceeded)

Trait Implementations

impl Clone for GossipSender

fn clone(&self) -> GossipSender

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GossipSender

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.