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//! Implementation of the libp2p-specific Kademlia protocol.
//!
//! See [specification](https://github.com/libp2p/specs/blob/master/kad-dht/README.md) for details.
//!
//! # Important Discrepancies
//!
//! - **Peer Discovery with Identify** In other libp2p implementations, the
//! [Identify](https://github.com/libp2p/specs/tree/master/identify) protocol might be seen as a core protocol. Rust-libp2p
//! tries to stay as generic as possible, and does not make this assumption.
//! This means that the Identify protocol must be manually hooked up to Kademlia through calls
//! to [`Kademlia::add_address`].
//! If you choose not to use the Identify protocol, and do not provide an alternative peer
//! discovery mechanism, a Kademlia node will not discover nodes beyond the network's
//! [boot nodes](https://docs.libp2p.io/reference/glossary/#boot-node). Without the Identify protocol,
//! existing nodes in the kademlia network cannot obtain the listen addresses
//! of nodes querying them, and thus will not be able to add them to their routing table.
// TODO: we allow dead_code for now because this library contains a lot of unused code that will
// be useful later for record store
extern crate _serde as serde;
pub use Addresses;
pub use ;
pub use ;
pub use KadConnectionType;
pub use QueryId;
pub use ;
use NonZeroUsize;
/// The `k` parameter of the Kademlia specification.
///
/// This parameter determines:
///
/// 1) The (fixed) maximum number of nodes in a bucket.
/// 2) The (default) replication factor, which in turn determines:
/// a) The number of closer peers returned in response to a request.
/// b) The number of closest peers to a key to search for in an iterative query.
///
/// The choice of (1) is fixed to this constant. The replication factor is configurable
/// but should generally be no greater than `K_VALUE`. All nodes in a Kademlia
/// DHT should agree on the choices made for (1) and (2).
///
/// The current value is `20`.
pub const K_VALUE: NonZeroUsize = unsafe ;
/// The `α` parameter of the Kademlia specification.
///
/// This parameter determines the default parallelism for iterative queries,
/// i.e. the allowed number of in-flight requests that an iterative query is
/// waiting for at a particular time while it continues to make progress towards
/// locating the closest peers to a key.
///
/// The current value is `3`.
pub const ALPHA_VALUE: NonZeroUsize = unsafe ;