247 lines
8.1 KiB
Go
247 lines
8.1 KiB
Go
// Copyright 2022 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 miner
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import (
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"crypto/sha256"
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"encoding/binary"
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"math/big"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/beacon/engine"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// BuildPayloadArgs contains the provided parameters for building payload.
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// Check engine-api specification for more details.
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// https://github.com/ethereum/execution-apis/blob/main/src/engine/cancun.md#payloadattributesv3
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type BuildPayloadArgs struct {
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Parent common.Hash // The parent block to build payload on top
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Timestamp uint64 // The provided timestamp of generated payload
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FeeRecipient common.Address // The provided recipient address for collecting transaction fee
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Random common.Hash // The provided randomness value
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Withdrawals types.Withdrawals // The provided withdrawals
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BeaconRoot *common.Hash // The provided beaconRoot (Cancun)
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Version engine.PayloadVersion // Versioning byte for payload id calculation.
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}
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// Id computes an 8-byte identifier by hashing the components of the payload arguments.
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func (args *BuildPayloadArgs) Id() engine.PayloadID {
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hasher := sha256.New()
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hasher.Write(args.Parent[:])
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binary.Write(hasher, binary.BigEndian, args.Timestamp)
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hasher.Write(args.Random[:])
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hasher.Write(args.FeeRecipient[:])
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rlp.Encode(hasher, args.Withdrawals)
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if args.BeaconRoot != nil {
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hasher.Write(args.BeaconRoot[:])
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}
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var out engine.PayloadID
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copy(out[:], hasher.Sum(nil)[:8])
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out[0] = byte(args.Version)
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return out
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}
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// Payload wraps the built payload(block waiting for sealing). According to the
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// engine-api specification, EL should build the initial version of the payload
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// which has an empty transaction set and then keep update it in order to maximize
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// the revenue. Therefore, the empty-block here is always available and full-block
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// will be set/updated afterwards.
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type Payload struct {
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id engine.PayloadID
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empty *types.Block
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full *types.Block
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sidecars []*types.BlobTxSidecar
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fullFees *big.Int
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stop chan struct{}
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lock sync.Mutex
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cond *sync.Cond
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}
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// newPayload initializes the payload object.
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func newPayload(empty *types.Block, id engine.PayloadID) *Payload {
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payload := &Payload{
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id: id,
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empty: empty,
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stop: make(chan struct{}),
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}
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log.Info("Starting work on payload", "id", payload.id)
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payload.cond = sync.NewCond(&payload.lock)
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return payload
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}
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// update updates the full-block with latest built version.
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func (payload *Payload) update(r *newPayloadResult, elapsed time.Duration) {
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payload.lock.Lock()
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defer payload.lock.Unlock()
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select {
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case <-payload.stop:
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return // reject stale update
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default:
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}
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// Ensure the newly provided full block has a higher transaction fee.
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// In post-merge stage, there is no uncle reward anymore and transaction
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// fee(apart from the mev revenue) is the only indicator for comparison.
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if payload.full == nil || r.fees.Cmp(payload.fullFees) > 0 {
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payload.full = r.block
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payload.fullFees = r.fees
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payload.sidecars = r.sidecars
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feesInEther := new(big.Float).Quo(new(big.Float).SetInt(r.fees), big.NewFloat(params.Ether))
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log.Info("Updated payload",
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"id", payload.id,
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"number", r.block.NumberU64(),
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"hash", r.block.Hash(),
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"txs", len(r.block.Transactions()),
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"withdrawals", len(r.block.Withdrawals()),
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"gas", r.block.GasUsed(),
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"fees", feesInEther,
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"root", r.block.Root(),
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"elapsed", common.PrettyDuration(elapsed),
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)
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}
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payload.cond.Broadcast() // fire signal for notifying full block
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}
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// Resolve returns the latest built payload and also terminates the background
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// thread for updating payload. It's safe to be called multiple times.
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func (payload *Payload) Resolve() *engine.ExecutionPayloadEnvelope {
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payload.lock.Lock()
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defer payload.lock.Unlock()
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select {
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case <-payload.stop:
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default:
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close(payload.stop)
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}
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if payload.full != nil {
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return engine.BlockToExecutableData(payload.full, payload.fullFees, payload.sidecars)
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}
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return engine.BlockToExecutableData(payload.empty, big.NewInt(0), nil)
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}
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// ResolveEmpty is basically identical to Resolve, but it expects empty block only.
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// It's only used in tests.
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func (payload *Payload) ResolveEmpty() *engine.ExecutionPayloadEnvelope {
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payload.lock.Lock()
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defer payload.lock.Unlock()
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return engine.BlockToExecutableData(payload.empty, big.NewInt(0), nil)
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}
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// ResolveFull is basically identical to Resolve, but it expects full block only.
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// Don't call Resolve until ResolveFull returns, otherwise it might block forever.
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func (payload *Payload) ResolveFull() *engine.ExecutionPayloadEnvelope {
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payload.lock.Lock()
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defer payload.lock.Unlock()
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if payload.full == nil {
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select {
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case <-payload.stop:
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return nil
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default:
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}
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// Wait the full payload construction. Note it might block
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// forever if Resolve is called in the meantime which
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// terminates the background construction process.
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payload.cond.Wait()
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}
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// Terminate the background payload construction
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select {
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case <-payload.stop:
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default:
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close(payload.stop)
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}
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return engine.BlockToExecutableData(payload.full, payload.fullFees, payload.sidecars)
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}
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// buildPayload builds the payload according to the provided parameters.
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func (miner *Miner) buildPayload(args *BuildPayloadArgs) (*Payload, error) {
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// Build the initial version with no transaction included. It should be fast
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// enough to run. The empty payload can at least make sure there is something
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// to deliver for not missing slot.
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emptyParams := &generateParams{
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timestamp: args.Timestamp,
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forceTime: true,
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parentHash: args.Parent,
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coinbase: args.FeeRecipient,
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random: args.Random,
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withdrawals: args.Withdrawals,
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beaconRoot: args.BeaconRoot,
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noTxs: true,
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}
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empty := miner.generateWork(emptyParams)
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if empty.err != nil {
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return nil, empty.err
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}
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// Construct a payload object for return.
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payload := newPayload(empty.block, args.Id())
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// Spin up a routine for updating the payload in background. This strategy
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// can maximum the revenue for including transactions with highest fee.
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go func() {
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// Setup the timer for re-building the payload. The initial clock is kept
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// for triggering process immediately.
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timer := time.NewTimer(0)
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defer timer.Stop()
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// Setup the timer for terminating the process if SECONDS_PER_SLOT (12s in
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// the Mainnet configuration) have passed since the point in time identified
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// by the timestamp parameter.
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endTimer := time.NewTimer(time.Second * 12)
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fullParams := &generateParams{
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timestamp: args.Timestamp,
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forceTime: true,
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parentHash: args.Parent,
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coinbase: args.FeeRecipient,
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random: args.Random,
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withdrawals: args.Withdrawals,
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beaconRoot: args.BeaconRoot,
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noTxs: false,
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}
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for {
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select {
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case <-timer.C:
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start := time.Now()
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r := miner.generateWork(fullParams)
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if r.err == nil {
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payload.update(r, time.Since(start))
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} else {
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log.Info("Error while generating work", "id", payload.id, "err", r.err)
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}
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timer.Reset(miner.config.Recommit)
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case <-payload.stop:
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log.Info("Stopping work on payload", "id", payload.id, "reason", "delivery")
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return
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case <-endTimer.C:
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log.Info("Stopping work on payload", "id", payload.id, "reason", "timeout")
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return
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}
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}
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}()
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return payload, nil
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}
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