66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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package fakebeacon
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import (
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"context"
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"errors"
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"fmt"
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"math/rand"
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"time"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/rpc"
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)
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func fetchBlockNumberByTime(ctx context.Context, ts int64, backend ethapi.Backend) (*types.Header, error) {
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// calc the block number of the ts.
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currentHeader := backend.CurrentHeader()
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blockTime := int64(currentHeader.Time)
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if ts > blockTime {
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return nil, errors.New("time too large")
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}
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blockNum := currentHeader.Number.Uint64()
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estimateEndNumber := int64(blockNum) - (blockTime-ts)/3
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// find the end number
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for {
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header, err := backend.HeaderByNumber(ctx, rpc.BlockNumber(estimateEndNumber))
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if err != nil {
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time.Sleep(time.Duration(rand.Int()%180) * time.Millisecond)
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continue
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}
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if header == nil {
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estimateEndNumber -= 1
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time.Sleep(time.Duration(rand.Int()%180) * time.Millisecond)
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continue
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}
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headerTime := int64(header.Time)
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if headerTime == ts {
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return header, nil
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}
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// let the estimateEndNumber a little bigger than real value
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if headerTime > ts+8 {
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estimateEndNumber -= (headerTime - ts) / 3
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} else if headerTime < ts {
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estimateEndNumber += (ts-headerTime)/3 + 1
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} else {
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// search one by one
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for headerTime >= ts {
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header, err = backend.HeaderByNumber(ctx, rpc.BlockNumber(estimateEndNumber-1))
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if err != nil {
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time.Sleep(time.Duration(rand.Int()%180) * time.Millisecond)
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continue
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}
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headerTime = int64(header.Time)
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if headerTime == ts {
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return header, nil
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}
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estimateEndNumber -= 1
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if headerTime < ts { //found the real endNumber
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return nil, fmt.Errorf("block not found by time %d", ts)
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}
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}
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}
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}
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}
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