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118 lines
4.5 KiB
Go
118 lines
4.5 KiB
Go
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"math/big"
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"time"
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"github.com/ledgerwatch/erigon-lib/kv"
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"github.com/ledgerwatch/erigon/common"
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"github.com/ledgerwatch/erigon/core/rawdb"
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"github.com/ledgerwatch/erigon/core/types"
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"github.com/ledgerwatch/erigon/p2p/enode"
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"github.com/ledgerwatch/erigon/params"
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)
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const (
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// softResponseLimit is the target maximum size of replies to data retrievals.
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softResponseLimit = 2 * 1024 * 1024
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// estHeaderSize is the approximate size of an RLP encoded block header.
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estHeaderSize = 500
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// maxHeadersServe is the maximum number of block headers to serve. This number
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// is there to limit the number of disk lookups.
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MaxHeadersServe = 1024
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// maxBodiesServe is the maximum number of block bodies to serve. This number
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// is mostly there to limit the number of disk lookups. With 24KB block sizes
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// nowadays, the practical limit will always be softResponseLimit.
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MaxBodiesServe = 1024
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// maxReceiptsServe is the maximum number of block receipts to serve. This
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// number is mostly there to limit the number of disk lookups. With block
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// containing 200+ transactions nowadays, the practical limit will always
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// be softResponseLimit.
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maxReceiptsServe = 1024
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)
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// Handler is a callback to invoke from an outside runner after the boilerplate
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// exchanges have passed.
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type Handler func(peer *Peer) error
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// Backend defines the data retrieval methods t,o serve remote requests and the
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// callback methods to invoke on remote deliveries.
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type Backend interface {
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DB() kv.RwDB
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// TxPool retrieves the transaction pool object to serve data.
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TxPool() TxPool
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// AcceptTxs retrieves whether transaction processing is enabled on the node
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// or if inbound transactions should simply be dropped.
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AcceptTxs() bool
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// RunPeer is invoked when a peer joins on the `eth` protocol. The handler
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// should do any peer maintenance work, handshakes and validations. If all
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// is passed, control should be given back to the `handler` to process the
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// inbound messages going forward.
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RunPeer(peer *Peer, handler Handler) error
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// PeerInfo retrieves all known `eth` information about a peer.
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PeerInfo(id enode.ID) interface{}
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// Handle is a callback to be invoked when a data packet is received from
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// the remote peer. Only packets not consumed by the protocol handler will
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// be forwarded to the backend.
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Handle(peer *Peer, packet Packet) error
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}
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// TxPool defines the methods needed by the protocol handler to serve transactions.
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type TxPool interface {
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// Get retrieves the the transaction from the local txpool with the given hash.
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Get(hash common.Hash) types.Transaction
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}
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// NodeInfo represents a short summary of the `eth` sub-protocol metadata
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// known about the host peer.
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type NodeInfo struct {
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Network uint64 `json:"network"` // Ethereum network ID (1=Frontier, Ropsten=3, Rinkeby=4)
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Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
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Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
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Config *params.ChainConfig `json:"config"` // ChainDB configuration for the fork rules
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Head common.Hash `json:"head"` // Hex hash of the host's best owned block
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}
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// ReadNodeInfo retrieves some `eth` protocol metadata about the running host node.
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func ReadNodeInfo(getter kv.Getter, config *params.ChainConfig, genesisHash common.Hash, network uint64) *NodeInfo {
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head := rawdb.ReadCurrentHeader(getter)
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td, _ := rawdb.ReadTd(getter, head.Hash(), head.Number.Uint64())
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return &NodeInfo{
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Network: network,
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Difficulty: td,
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Genesis: genesisHash,
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Config: config,
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Head: head.Hash(),
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}
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}
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type Decoder interface {
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Decode(val interface{}) error
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Time() time.Time
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}
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