mirror of https://github.com/status-im/nim-eth.git
116 lines
3.4 KiB
Nim
116 lines
3.4 KiB
Nim
#
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# Ethereum P2P
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# (c) Copyright 2018
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# Status Research & Development GmbH
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#
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# Licensed under either of
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# Apache License, version 2.0, (LICENSE-APACHEv2)
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# MIT license (LICENSE-MIT)
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#
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## This module implements the Ethereum Wire Protocol:
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## https://github.com/ethereum/wiki/wiki/Ethereum-Wire-Protocol
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import
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chronos, stint, chronicles, eth/rlp, eth/common/eth_types,
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../rlpx, ../private/p2p_types, ../blockchain_utils, ../../p2p
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type
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NewBlockHashesAnnounce* = object
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hash: KeccakHash
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number: uint
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NewBlockAnnounce* = object
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header*: BlockHeader
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body* {.rlpInline.}: BlockBody
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PeerState = ref object
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initialized*: bool
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bestBlockHash*: KeccakHash
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bestDifficulty*: DifficultyInt
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const
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maxStateFetch* = 384
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maxBodiesFetch* = 128
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maxReceiptsFetch* = 256
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maxHeadersFetch* = 192
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protocolVersion* = 63
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p2pProtocol eth(version = protocolVersion,
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peerState = PeerState,
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useRequestIds = false):
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onPeerConnected do (peer: Peer):
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let
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network = peer.network
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chain = network.chain
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bestBlock = chain.getBestBlockHeader
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let m = await peer.status(protocolVersion,
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network.networkId,
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bestBlock.difficulty,
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bestBlock.blockHash,
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chain.genesisHash,
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timeout = chronos.seconds(10))
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if m.networkId == network.networkId and m.genesisHash == chain.genesisHash:
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trace "suitable peer", peer
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else:
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raise newException(UselessPeerError, "Eth handshake params mismatch")
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peer.state.initialized = true
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peer.state.bestDifficulty = m.totalDifficulty
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peer.state.bestBlockHash = m.bestHash
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handshake:
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proc status(peer: Peer,
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protocolVersion: uint,
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networkId: uint,
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totalDifficulty: DifficultyInt,
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bestHash: KeccakHash,
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genesisHash: KeccakHash)
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proc newBlockHashes(peer: Peer, hashes: openarray[NewBlockHashesAnnounce]) =
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discard
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proc transactions(peer: Peer, transactions: openarray[Transaction]) =
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discard
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requestResponse:
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proc getBlockHeaders(peer: Peer, request: BlocksRequest) {.gcsafe.} =
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if request.maxResults > uint64(maxHeadersFetch):
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await peer.disconnect(BreachOfProtocol)
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return
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await response.send(peer.network.chain.getBlockHeaders(request))
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proc blockHeaders(p: Peer, headers: openarray[BlockHeader])
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requestResponse:
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proc getBlockBodies(peer: Peer, hashes: openarray[KeccakHash]) {.gcsafe.} =
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if hashes.len > maxBodiesFetch:
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await peer.disconnect(BreachOfProtocol)
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return
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await response.send(peer.network.chain.getBlockBodies(hashes))
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proc blockBodies(peer: Peer, blocks: openarray[BlockBody])
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proc newBlock(peer: Peer, bh: NewBlockAnnounce, totalDifficulty: DifficultyInt) =
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discard
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nextID 13
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requestResponse:
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proc getNodeData(peer: Peer, hashes: openarray[KeccakHash]) =
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await response.send(peer.network.chain.getStorageNodes(hashes))
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proc nodeData(peer: Peer, data: openarray[Blob])
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requestResponse:
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proc getReceipts(peer: Peer, hashes: openarray[KeccakHash]) = discard
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# TODO: implement `getReceipts` and reactivate this code
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# await response.send(peer.network.chain.getReceipts(hashes))
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proc receipts(peer: Peer, receipts: openarray[Receipt])
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