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* dex: Add a flag to GetBlockHeadersMsg and GetBlockBodiesMsg
So that we can dispatch the response msg to fetcher or downloader
easily.
* fixup! dex: Add a flag to GetBlockHeadersMsg and GetBlockBodiesMsg
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* p2p, dex: rework connection management
* dex: refresh our node record periodically
* dex: don't send new record event if no new record
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* vendor: sync to latest core
* dex: Add PullRandomness
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- Broadcasting blocks at chain head event is not correct when the full
node is not running in block proposer mode. Introduce NewFinalizedBlockEvent,
this event is post by the full node which runs in block proposer mode when a
block is witnessed and resulting in some blocks are considered finalized.
- Non block proposer node will still broadcast blocks
at the following moment (same as ethereum):
1. a sync with a peer is terminated successfully
2. a block passes the fetcher's header check during inserting blocks
3. a block is successfully inserted by fetcher
- Don't trigger a sync when we are not behind other peers more than
acceptable distance. Fetcher is able to cover this.
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In dexon, we don't "mine" and the blockchain won't and shouldn't fork, so
there is no difficulty concept, just replace it with block number.
Note: this commit only replace total difficulty related logic and code
in dex, dex/downloader package.
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We need governance state to verify block's signature (randomness),
but in ethereum fast sync mode, eth downloader only downloads the whole
state of pivot block, so we don't have governance state to verify the
downloaded block that is before pivot block if we don't processing
transaction.
To avoid running transactions, dex downloader also downloads the
governance state (merkle proof and storage) at snapshot height of each round,
so that we can verify blocks in fast sync mode.
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- Let p2p server support direct connection and group connection.
- Introduce node meta table to maintain IP of all nodes in node set,
in memory and let nodes in the network can sync this table.
- Let peerSet able to manage direct connections to notary set and dkg set.
The mechanism to refresh the network topology when configuration round
change is not done yet.
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