Module gossip_protocol_engine 

Gossip Dissemination Protocol Engine

A production-quality gossip protocol engine implementing epidemic broadcast with pluggable fanout strategies, message deduplication, hop-count TTL, and per-peer delivery scoring. All state is synchronous and Send + Sync-compatible (the public API takes &mut self for mutable operations).

Design notes

• No external PRNG: xorshift64 is used where randomness is required.
• No rand crate: coin-flip / shuffle are done inline.
• FNV-1a 64-bit is used for deterministic message-ID generation.
• Dedup cache: bounded VecDeque providing O(1) push / O(n) lookup, sufficient for typical gossip workloads where the window is small (≤ 4096 messages).

Structs

GossipConfig

Configuration for a GossipProtocolEngine.

GossipMessage

A gossip message travelling through the overlay.

GossipPeer

An active or recently-seen gossip peer.

GossipProtocolEngine

Production-quality gossip dissemination protocol engine.

GossipStats

Aggregate statistics produced by a GossipProtocolEngine.

Enums

EngineError

Errors returned by GossipProtocolEngine operations.

FanoutStrategy

Peer-selection strategy used when forwarding messages.

GossipEvent

Events emitted by a GossipProtocolEngine.

Functions

fnv1a_64

FNV-1a 64-bit hash.

xorshift64

Xorshift64 PRNG – mutates state in-place and returns the next value.