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concurrent.go
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concurrent.go
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package wallet
import (
"context"
"math/big"
"sort"
"sync"
"time"
"github.com/pkg/errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
// NewConcurrentDownloader creates ConcurrentDownloader instance.
func NewConcurrentDownloader(ctx context.Context) *ConcurrentDownloader {
runner := NewAtomicGroup(ctx)
result := &Result{}
return &ConcurrentDownloader{runner, result}
}
type ConcurrentDownloader struct {
*AtomicGroup
*Result
}
type Result struct {
mu sync.Mutex
transfers []Transfer
headers []*DBHeader
blockRanges [][]*big.Int
}
var errDownloaderStuck = errors.New("eth downloader is stuck")
func (r *Result) Push(transfers ...Transfer) {
r.mu.Lock()
defer r.mu.Unlock()
r.transfers = append(r.transfers, transfers...)
}
func (r *Result) Get() []Transfer {
r.mu.Lock()
defer r.mu.Unlock()
rst := make([]Transfer, len(r.transfers))
copy(rst, r.transfers)
return rst
}
func (r *Result) PushHeader(block *DBHeader) {
r.mu.Lock()
defer r.mu.Unlock()
r.headers = append(r.headers, block)
}
func (r *Result) GetHeaders() []*DBHeader {
r.mu.Lock()
defer r.mu.Unlock()
rst := make([]*DBHeader, len(r.headers))
copy(rst, r.headers)
return rst
}
func (r *Result) PushRange(blockRange []*big.Int) {
r.mu.Lock()
defer r.mu.Unlock()
r.blockRanges = append(r.blockRanges, blockRange)
}
func (r *Result) GetRanges() [][]*big.Int {
r.mu.Lock()
defer r.mu.Unlock()
rst := make([][]*big.Int, len(r.blockRanges))
copy(rst, r.blockRanges)
r.blockRanges = [][]*big.Int{}
return rst
}
// TransferDownloader downloads transfers from single block using number.
type TransferDownloader interface {
GetTransfersByNumber(context.Context, *big.Int) ([]Transfer, error)
}
func checkRanges(parent context.Context, client reactorClient, cache BalanceCache, downloader TransferDownloader, account common.Address, ranges [][]*big.Int) ([][]*big.Int, []*DBHeader, error) {
ctx, cancel := context.WithTimeout(parent, 30*time.Second)
defer cancel()
c := NewConcurrentDownloader(ctx)
for _, blocksRange := range ranges {
from := blocksRange[0]
to := blocksRange[1]
c.Add(func(ctx context.Context) error {
if from.Cmp(to) >= 0 {
return nil
}
log.Debug("eth transfers comparing blocks", "from", from, "to", to)
lb, err := cache.BalanceAt(ctx, client, account, from)
if err != nil {
return err
}
hb, err := cache.BalanceAt(ctx, client, account, to)
if err != nil {
return err
}
if lb.Cmp(hb) == 0 {
log.Debug("balances are equal", "from", from, "to", to)
// In case if balances are equal but non zero we want to check if
// eth_getTransactionCount return different values, because there
// still might be transactions
if lb.Cmp(zero) != 0 {
return nil
}
ln, err := client.NonceAt(ctx, account, from)
if err != nil {
return err
}
hn, err := client.NonceAt(ctx, account, to)
if err != nil {
return err
}
if ln == hn {
log.Debug("transaction count is also equal", "from", from, "to", to)
return nil
}
}
if new(big.Int).Sub(to, from).Cmp(one) == 0 {
header, err := client.HeaderByNumber(ctx, to)
if err != nil {
return err
}
c.PushHeader(toDBHeader(header))
return nil
}
mid := new(big.Int).Add(from, to)
mid = mid.Div(mid, two)
_, err = cache.BalanceAt(ctx, client, account, mid)
if err != nil {
return err
}
log.Debug("balances are not equal", "from", from, "mid", mid, "to", to)
c.PushRange([]*big.Int{from, mid})
c.PushRange([]*big.Int{mid, to})
return nil
})
}
select {
case <-c.WaitAsync():
case <-ctx.Done():
return nil, nil, errDownloaderStuck
}
if c.Error() != nil {
return nil, nil, errors.Wrap(c.Error(), "failed to dowload transfers using concurrent downloader")
}
return c.GetRanges(), c.GetHeaders(), nil
}
func findBlocksWithEthTransfers(parent context.Context, client reactorClient, cache BalanceCache, downloader TransferDownloader, account common.Address, low, high *big.Int, noLimit bool) (from *big.Int, headers []*DBHeader, err error) {
ranges := [][]*big.Int{{low, high}}
minBlock := big.NewInt(low.Int64())
headers = []*DBHeader{}
var lvl = 1
for len(ranges) > 0 && lvl <= 30 {
log.Debug("check blocks ranges", "lvl", lvl, "ranges len", len(ranges))
lvl++
newRanges, newHeaders, err := checkRanges(parent, client, cache, downloader, account, ranges)
if err != nil {
return nil, nil, err
}
headers = append(headers, newHeaders...)
if len(newRanges) > 0 {
log.Debug("found new ranges", "account", account, "lvl", lvl, "new ranges len", len(newRanges))
}
if len(newRanges) > 60 && !noLimit {
sort.SliceStable(newRanges, func(i, j int) bool {
return newRanges[i][0].Cmp(newRanges[j][0]) == 1
})
newRanges = newRanges[:60]
minBlock = newRanges[len(newRanges)-1][0]
}
ranges = newRanges
}
return minBlock, headers, err
}