nim-eth/eth/p2p/rlpx_protocols/eth_protocol.nim

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