Struct libp2p_swarm::SwarmBuilder

pub struct SwarmBuilder<TBehaviour> { /* private fields */ }

A SwarmBuilder provides an API for configuring and constructing a Swarm, including the underlying Network.

Implementations

impl<TBehaviour> SwarmBuilder<TBehaviour> where
    TBehaviour: NetworkBehaviour, 

pub fn new(
    transport: Boxed<(PeerId, StreamMuxerBox)>,
    behaviour: TBehaviour,
    local_peer_id: PeerId
) -> Self

Creates a new SwarmBuilder from the given transport, behaviour and local peer ID. The Swarm with its underlying Network is obtained via SwarmBuilder::build.

pub fn executor(self, e: Box<dyn Executor + Send>) -> Self

Configures the Executor to use for spawning background tasks.

By default, unless another executor has been configured, SwarmBuilder::build will try to set up a ThreadPool.

pub fn notify_handler_buffer_size(self, n: NonZeroUsize) -> Self

Configures the number of events from the NetworkBehaviour in destination to the ProtocolsHandler that can be buffered before the Swarm has to wait. An individual buffer with this number of events exists for each individual connection.

The ideal value depends on the executor used, the CPU speed, and the volume of events. If this value is too low, then the Swarm will be sleeping more often than necessary. Increasing this value increases the overall memory usage.

pub fn connection_event_buffer_size(self, n: usize) -> Self

Configures the number of extra events from the ProtocolsHandler in destination to the NetworkBehaviour that can be buffered before the ProtocolsHandler has to go to sleep.

There exists a buffer of events received from ProtocolsHandlers that the NetworkBehaviour has yet to process. This buffer is shared between all instances of ProtocolsHandler. Each instance of ProtocolsHandler is guaranteed one slot in this buffer, meaning that delivering an event for the first time is guaranteed to be instantaneous. Any extra event delivery, however, must wait for that first event to be delivered or for an “extra slot” to be available.

This option configures the number of such “extra slots” in this shared buffer. These extra slots are assigned in a first-come, first-served basis.

The ideal value depends on the executor used, the CPU speed, the average number of connections, and the volume of events. If this value is too low, then the ProtocolsHandlers will be sleeping more often than necessary. Increasing this value increases the overall memory usage, and more importantly the latency between the moment when an event is emitted and the moment when it is received by the NetworkBehaviour.

pub fn connection_limits(self, limits: ConnectionLimits) -> Self

Configures the connection limits.

pub fn substream_upgrade_protocol_override(self, v: Version) -> Self

Configures an override for the substream upgrade protocol to use.

The subtream upgrade protocol is the multistream-select protocol used for protocol negotiation on substreams. Since a listener supports all existing versions, the choice of upgrade protocol only effects the “dialer”, i.e. the peer opening a substream.

Note: If configured, specific upgrade protocols for individual SubstreamProtocols emitted by the NetworkBehaviour are ignored.

pub fn build(self) -> Swarm<TBehaviour>

Builds a Swarm with the current configuration.