161 lines
5.4 KiB
Nim
161 lines
5.4 KiB
Nim
# Nimbus - Ethereum Wire Protocol, version eth/65
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#
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# Copyright (c) 2018-2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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## This module implements Ethereum Wire Protocol version 65, `eth/65`.
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## Specification:
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## https://github.com/ethereum/devp2p/blob/master/caps/eth.md
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import
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chronos, stint, chronicles, stew/byteutils, macros,
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eth/[common/eth_types, rlp, p2p],
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eth/p2p/[rlpx, private/p2p_types, blockchain_utils],
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../p2p/chain
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type
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NewBlockHashesAnnounce* = object
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hash: KeccakHash
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number: uint64 # Note: Was `uint`, wrong on 32-bit targets.
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NewBlockAnnounce* = object
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header*: BlockHeader
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body* {.rlpInline.}: BlockBody
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ForkId* = object
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forkHash: array[4, byte] # The RLP encoding must be exactly 4 bytes.
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forkNext: BlockNumber # The RLP encoding must be variable-length
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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* = 65
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func toHex(x: KeccakHash): string = x.data.toHex
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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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chainForkId = chain.getForkId(bestBlock.blockNumber)
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forkId = ForkId(
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forkHash: chainForkId.crc.toBytesBe,
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forkNext: chainForkId.nextFork.u256,
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)
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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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forkId,
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timeout = chronos.seconds(10))
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if m.networkId != network.networkId:
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trace "Peer for a different network (networkId)", peer,
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expectNetworkId=network.networkId, gotNetworkId=m.networkId
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raise newException(UselessPeerError, "Eth handshake for different network")
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if m.genesisHash != chain.genesisHash:
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trace "Peer for a different network (genesisHash)", peer,
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expectGenesis=chain.genesisHash.toHex, gotGenesis=m.genesisHash.toHex
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raise newException(UselessPeerError, "Eth handshake for different network")
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trace "Peer matches our network", peer
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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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# User message 0x00: Status.
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proc status(peer: Peer,
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protocolVersion: uint,
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networkId: NetworkId,
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totalDifficulty: DifficultyInt,
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bestHash: KeccakHash,
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genesisHash: KeccakHash,
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forkId: ForkId)
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# User message 0x01: NewBlockHashes.
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proc newBlockHashes(peer: Peer, hashes: openArray[NewBlockHashesAnnounce]) =
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discard
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# User message 0x02: Transactions.
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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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# User message 0x03: GetBlockHeaders.
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proc getBlockHeaders(peer: Peer, request: BlocksRequest) =
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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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# User message 0x04: BlockHeaders.
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proc blockHeaders(p: Peer, headers: openArray[BlockHeader])
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requestResponse:
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# User message 0x05: GetBlockBodies.
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proc getBlockBodies(peer: Peer, hashes: openArray[KeccakHash]) =
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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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# User message 0x06: BlockBodies.
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proc blockBodies(peer: Peer, blocks: openArray[BlockBody])
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# User message 0x07: NewBlock.
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proc newBlock(peer: Peer, bh: NewBlockAnnounce, totalDifficulty: DifficultyInt) =
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discard
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# User message 0x08: NewPooledTransactionHashes.
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proc newPooledTransactionHashes(peer: Peer, hashes: openArray[KeccakHash]) =
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discard
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requestResponse:
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# User message 0x09: GetPooledTransactions.
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proc getPooledTransactions(peer: Peer, hashes: openArray[KeccakHash]) =
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await response.send([])
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# User message 0x0a: PooledTransactions.
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proc pooledTransactions(peer: Peer, transactions: openArray[Transaction])
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nextId 0x0d
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requestResponse:
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# User message 0x0d: GetNodeData.
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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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# User message 0x0e: NodeData.
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proc nodeData(peer: Peer, data: openArray[Blob])
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requestResponse:
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# User message 0x0f: GetReceipts.
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proc getReceipts(peer: Peer, hashes: openArray[KeccakHash]) =
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await response.send([])
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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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# User message 0x10: Receipts.
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proc receipts(peer: Peer, receipts: openArray[Receipt])
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