// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"time"
"github.com/ava-labs/coreth/core/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/log"
)
// insertStats tracks and reports on block insertion.
type insertStats struct {
queued, processed, ignored int
usedGas uint64
lastIndex int
startTime mclock.AbsTime
}
// statsReportLimit is the time limit during import and export after which we
// always print out progress. This avoids the user wondering what's going on.
const statsReportLimit = 8 * time.Second
// report prints statistics if some number of blocks have been processed
// or more than a few seconds have passed since the last message.
func (st *insertStats) report(chain []*types.Block, index int, dirty common.StorageSize) {
// Fetch the timings for the batch
var (
now = mclock.Now()
elapsed = time.Duration(now) - time.Duration(st.startTime)
)
// If we're at the last block of the batch or report period reached, log
if index == len(chain)-1 || elapsed >= statsReportLimit {
// Count the number of transactions in this segment
var txs int
for _, block := range chain[st.lastIndex : index+1] {
txs += len(block.Transactions())
}
end := chain[index]
// Assemble the log context and send it to the logger
context := []interface{}{
"blocks", st.processed, "txs", txs, "mgas", float64(st.usedGas) / 1000000,
"elapsed", common.PrettyDuration(elapsed), "mgasps", float64(st.usedGas) * 1000 / float64(elapsed),
"number", end.Number(), "hash", end.Hash(),
}
if timestamp := time.Unix(int64(end.Time()), 0); time.Since(timestamp) > time.Minute {
context = append(context, []interface{}{"age", common.PrettyAge(timestamp)}...)
}
context = append(context, []interface{}{"dirty", dirty}...)
if st.queued > 0 {
context = append(context, []interface{}{"queued", st.queued}...)
}
if st.ignored > 0 {
context = append(context, []interface{}{"ignored", st.ignored}...)
}
log.Info("Imported new chain segment", context...)
// Bump the stats reported to the next section
*st = insertStats{startTime: now, lastIndex: index + 1}
}
}
// insertIterator is a helper to assist during chain import.
type insertIterator struct {
chain types.Blocks // Chain of blocks being iterated over
results <-chan error // Verification result sink from the consensus engine
errors []error // Header verification errors for the blocks
index int // Current offset of the iterator
validator Validator // Validator to run if verification succeeds
}
// newInsertIterator creates a new iterator based on the given blocks, which are
// assumed to be a contiguous chain.
func newInsertIterator(chain types.Blocks, results <-chan error, validator Validator) *insertIterator {
return &insertIterator{
chain: chain,
results: results,
errors: make([]error, 0, len(chain)),
index: -1,
validator: validator,
}
}
// next returns the next block in the iterator, along with any potential validation
// error for that block. When the end is reached, it will return (nil, nil).
func (it *insertIterator) next() (*types.Block, error) {
// If we reached the end of the chain, abort
if it.index+1 >= len(it.chain) {
it.index = len(it.chain)
return nil, nil
}
// Advance the iterator and wait for verification result if not yet done
it.index++
if len(it.errors) <= it.index {
it.errors = append(it.errors, <-it.results)
}
if it.errors[it.index] != nil {
return it.chain[it.index], it.errors[it.index]
}
// Block header valid, run body validation and return
return it.chain[it.index], it.validator.ValidateBody(it.chain[it.index])
}
// peek returns the next block in the iterator, along with any potential validation
// error for that block, but does **not** advance the iterator.
//
// Both header and body validation errors (nil too) is cached into the iterator
// to avoid duplicating work on the following next() call.
func (it *insertIterator) peek() (*types.Block, error) {
// If we reached the end of the chain, abort
if it.index+1 >= len(it.chain) {
return nil, nil
}
// Wait for verification result if not yet done
if len(it.errors) <= it.index+1 {
it.errors = append(it.errors, <-it.results)
}
if it.errors[it.index+1] != nil {
return it.chain[it.index+1], it.errors[it.index+1]
}
// Block header valid, ignore body validation since we don't have a parent anyway
return it.chain[it.index+1], nil
}
// previous returns the previous header that was being processed, or nil.
func (it *insertIterator) previous() *types.Header {
if it.index < 1 {
return nil
}
return it.chain[it.index-1].Header()
}
// first returns the first block in the it.
func (it *insertIterator) first() *types.Block {
return it.chain[0]
}
// remaining returns the number of remaining blocks.
func (it *insertIterator) remaining() int {
return len(it.chain) - it.index
}
// processed returns the number of processed blocks.
func (it *insertIterator) processed() int {
return it.index + 1
}