79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
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package wallet
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import (
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"context"
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"math/big"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/log"
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)
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// NewConcurrentDownloader creates ConcurrentDownloader instance.
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func NewConcurrentDownloader(ctx context.Context) *ConcurrentDownloader {
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runner := NewAtomicGroup(ctx)
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result := &Result{}
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return &ConcurrentDownloader{runner, result}
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}
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type ConcurrentDownloader struct {
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*AtomicGroup
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*Result
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}
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type Result struct {
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mu sync.Mutex
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transfers []Transfer
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}
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func (r *Result) Push(transfers ...Transfer) {
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r.mu.Lock()
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defer r.mu.Unlock()
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r.transfers = append(r.transfers, transfers...)
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}
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func (r *Result) Get() []Transfer {
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r.mu.Lock()
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defer r.mu.Unlock()
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rst := make([]Transfer, len(r.transfers))
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copy(rst, r.transfers)
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return rst
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}
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// TransferDownloader downloads transfers from single block using number.
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type TransferDownloader interface {
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GetTransfersByNumber(context.Context, *big.Int) ([]Transfer, error)
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}
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func downloadEthConcurrently(c *ConcurrentDownloader, client BalanceReader, downloader TransferDownloader, account common.Address, low, high *big.Int) {
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c.Add(func(ctx context.Context) error {
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log.Debug("eth transfers comparing blocks", "low", low, "high", high)
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lb, err := client.BalanceAt(ctx, account, low)
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if err != nil {
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return err
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}
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hb, err := client.BalanceAt(ctx, account, high)
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if err != nil {
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return err
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}
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if lb.Cmp(hb) == 0 {
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log.Debug("balances are equal", "low", low, "high", high)
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return nil
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}
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if new(big.Int).Sub(high, low).Cmp(one) == 0 {
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transfers, err := downloader.GetTransfersByNumber(ctx, high)
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if err != nil {
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return err
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}
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c.Push(transfers...)
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return nil
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}
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mid := new(big.Int).Add(low, high)
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mid = mid.Div(mid, two)
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log.Debug("balances are not equal. spawn two concurrent downloaders", "low", low, "mid", mid, "high", high)
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downloadEthConcurrently(c, client, downloader, account, low, mid)
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downloadEthConcurrently(c, client, downloader, account, mid, high)
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return nil
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})
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}
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