reth_discv4

Struct Discv4Service

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pub struct Discv4Service { /* private fields */ }
Expand description

Manages discv4 peer discovery over UDP.

This is a [Stream] to handles incoming and outgoing discv4 messages and emits updates via: Discv4Service::update_stream.

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impl Discv4Service

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pub fn handle(&self) -> Discv4

Returns the frontend handle that can communicate with the service via commands.

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pub fn set_lookup_interval(&mut self, duration: Duration)

Sets the [Interval] used for periodically looking up targets over the network

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pub fn set_external_ip_addr(&mut self, external_ip: IpAddr)

Sets the given ip address as the node’s external IP in the node record announced in discovery

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pub const fn local_peer_id(&self) -> &PeerId

Returns the [PeerId] that identifies this node

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pub const fn local_addr(&self) -> SocketAddr

Returns the address of the UDP socket

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pub const fn local_enr(&self) -> NodeRecord

Returns the ENR of this service.

Note: this will include the external address if resolved.

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pub fn contains_node(&self, id: PeerId) -> bool

Returns true if the given PeerId is currently in the bucket

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pub fn bootstrap(&mut self)

Bootstraps the local node to join the DHT.

Bootstrapping is a multi-step operation that starts with a lookup of the local node’s own ID in the DHT. This introduces the local node to the other nodes in the DHT and populates its routing table with the closest proven neighbours.

This is similar to adding all bootnodes via Self::add_node, but does not fire a DiscoveryUpdate::Added event for the given bootnodes. So boot nodes don’t appear in the update stream, which is usually desirable, since bootnodes should not be connected to.

If adding the configured bootnodes should result in a DiscoveryUpdate::Added, see Self::add_all_nodes.

Note: This is a noop if there are no bootnodes.

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pub fn spawn(self) -> JoinHandle<()>

Spawns this services onto a new task

Note: requires a running runtime

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pub fn update_stream(&mut self) -> ReceiverStream<DiscoveryUpdate>

Creates a new bounded channel for DiscoveryUpdates.

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pub fn lookup_self(&mut self)

Looks up the local node in the DHT.

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pub fn lookup(&mut self, target: PeerId)

Looks up the given node in the DHT

A FindNode packet requests information about nodes close to target. The target is a 64-byte secp256k1 public key. When FindNode is received, the recipient should reply with Neighbors packets containing the closest 16 nodes to target found in its local table.

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pub fn ban_ip(&mut self, ip: IpAddr)

Adds the ip to the ban list indefinitely

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pub fn ban_node(&mut self, node_id: PeerId)

Adds the peer to the ban list indefinitely.

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pub fn ban_ip_until(&mut self, ip: IpAddr, until: Instant)

Adds the ip to the ban list until the given timestamp.

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pub fn ban_node_until(&mut self, node_id: PeerId, until: Instant)

Adds the peer to the ban list and bans it until the given timestamp

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pub fn remove_node(&mut self, node_id: PeerId) -> bool

Removes a node_id from the routing table.

This allows applications, for whatever reason, to remove nodes from the local routing table. Returns true if the node was in the table and false otherwise.

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pub fn soft_remove_node(&mut self, node_id: PeerId) -> bool

Removes a node_id from the routing table but only if there are enough other nodes in the bucket (bucket must be at least half full)

Returns true if the node was removed

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pub fn num_connected(&self) -> usize

Gets the number of entries that are considered connected.

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pub fn add_all_nodes(&mut self, records: impl IntoIterator<Item = NodeRecord>)

Adds all nodes

See Self::add_node

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pub fn add_node(&mut self, record: NodeRecord) -> bool

If the node’s not in the table yet, this will add it to the table and start the endpoint proof by sending a ping to the node.

Returns true if the record was added successfully, and false if the node is either already in the table or the record’s bucket is full.

Trait Implementations§

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impl Debug for Discv4Service

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

Formats the value using the given formatter. Read more
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impl Stream for Discv4Service

Endless future impl

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type Item = Discv4Event

Values yielded by the stream.
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fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more
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fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more

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Creates a new stream which skips n items of the underlying stream. Read more
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Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1392 bytes