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36 lines
1.9 KiB
36 lines
1.9 KiB
/*
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Package blockchain implements two versions of a reactor Service that are
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responsible for block propagation and gossip between peers. This mechanism is
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more formally known as fast-sync.
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In order for a full node to successfully participate in consensus, it must have
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the latest view of state. The fast-sync protocol is a mechanism in which peers
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may exchange and gossip entire blocks with one another, in a request/response
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type model, until they've successfully synced to the latest head block. Once
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succussfully synced, the full node can switch to an active role in consensus and
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will no longer fast-sync and thus no longer run the fast-sync process.
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Note, the blockchain reactor Service gossips entire block and relevant data such
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that each receiving peer may construct the entire view of the blockchain state.
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There are two versions of the blockchain reactor Service, i.e. fast-sync:
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- v0: The initial implementation that is battle-tested, but whose test coverage
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is lacking and is not formally verifiable.
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- v2: The latest implementation that has much higher test coverage and is formally
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verified. However, the current implementation of v2 is not as battle-tested and
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is known to have various bugs that could make it unreliable in production
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environments.
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The v0 blockchain reactor Service has one p2p channel, BlockchainChannel. This
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channel is responsible for handling messages that both request blocks and respond
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to block requests from peers. For every block request from a peer, the reactor
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will execute respondToPeer which will fetch the block from the node's state store
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and respond to the peer. For every block response, the node will add the block
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to its pool via AddBlock.
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Internally, v0 runs a poolRoutine that constantly checks for what blocks it needs
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and requests them. The poolRoutine is also responsible for taking blocks from the
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pool, saving and executing each block.
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*/
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package blockchain
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