nimbus-eth2/docs/block_flow.dot

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digraph architecture{
node [shape = invhouse]; Eth2RPC GossipSub WeakSubjectivitySync;
node [shape = octagon]; SyncManager SyncProtocol RequestManager;
SyncManager [label="SyncManager (Sync in)"];
node [shape = doubleoctagon] SharedBlockQueue;
{rank = same; SyncManager RequestManager;}
{rank = same; Eth2RPC GossipSub WeakSubjectivitySync;}
WeakSubjectivitySync [label="WeakSubjectivitySync (impl TBD)"];
node [shape = octagon]; Eth2Processor RequestManager;
node [shape = octagon]; ChainDAG Quarantine Clearance;
Eth2RPC -> SyncProtocol [dir=both]
SyncProtocol -> SyncManager [dir=both, label="beaconBlocksByRange() (mixin)"]
GossipSub -> Eth2Processor [label="node.topicBeaconBlocks: blockValidator->validateBeaconBlock (no transition or signature check yet)\nthen enqueued in blockQueue"];
GossipSub -> Eth2Processor [dir=back, label="node.topicBeaconBlocks: blockValidator()->ValidationResult.Accept->libp2p/gossipsub.nim\nvalidate() in rpcHandler()"];
Eth2Processor -> Clearance [label="storeBlock(): enqueue in clearance/quarantine and callback to fork choice"];
SyncProtocol -> RequestManager [dir=both, label="fetchAncestorBlocksFromNetwork()"];
SyncManager -> SharedBlockQueue [dir=both, label="Eth2Processor.blockQueue\n== SyncManager.outQueue (shared state!)"];
Eth2Processor -> SharedBlockQueue [dir=both, label="Eth2Processor.blockQueue\n== RequestManager.outQueue (shared state!)"];
SharedBlockQueue -> RequestManager [dir=both, label="SyncManager.outQueue\n== RequestManager.outQueue (shared state!)"];
LocalValidatorDuties -> Clearance
RequestManager -> Quarantine [dir=back, label="Retrieve missing ancestors"]
Clearance -> Quarantine
Clearance -> ChainDAG
Eth2Processor -> ForkChoice
LocalValidatorDuties -> ForkChoice
node [shape = cylinder]; BeaconChainDB;
ChainDAG -> BeaconChainDB [dir=both]
SyncProtocol -> ChainDAG [dir=back, label="Sync out: getBlockRange()\nbeaconBlocksByRoot()\n"]
}