Module net_processing 

Net Processing — Chain synchronization and message handling

This module implements the “brain” of the P2P protocol, corresponding to Bitcoin Core’s net_processing.cpp. It orchestrates:

• Headers-first sync: Send getheaders, receive headers, add to block index
• Block download: Request blocks via getdata for headers we’ve accepted
• Transaction relay: Process inv/getdata/tx messages for mempool
• Initial Block Download (IBD): Fast sync from genesis to chain tip

Architecture

SyncManager holds references to the BlockIndex, PeerManager, and storage ports. It processes PeerEvent messages and drives the sync state machine.

Structs

SyncManager

The sync manager drives chain synchronization.

Enums

HandshakeState

State of the P2P handshake with a peer.

SyncAction

Actions that the infrastructure layer should take after processing events.

SyncState

Current state of the blockchain sync process.