116 lines
3.9 KiB
Go
116 lines
3.9 KiB
Go
// Copyright 2021 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 downloader
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/eth/protocols/eth"
|
|
)
|
|
|
|
// fetchHeadersByHash is a blocking version of Peer.RequestHeadersByHash which
|
|
// handles all the cancellation, interruption and timeout mechanisms of a data
|
|
// retrieval to allow blocking API calls.
|
|
func (d *Downloader) fetchHeadersByHash(p *peerConnection, hash common.Hash, amount int, skip int, reverse bool) ([]*types.Header, []common.Hash, error) {
|
|
// Create the response sink and send the network request
|
|
start := time.Now()
|
|
resCh := make(chan *eth.Response)
|
|
|
|
req, err := p.peer.RequestHeadersByHash(hash, amount, skip, reverse, resCh)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
defer req.Close()
|
|
|
|
// Wait until the response arrives, the request is cancelled or times out
|
|
ttl := d.peers.rates.TargetTimeout()
|
|
|
|
timeoutTimer := time.NewTimer(ttl)
|
|
defer timeoutTimer.Stop()
|
|
|
|
select {
|
|
case <-d.cancelCh:
|
|
return nil, nil, errCanceled
|
|
|
|
case <-timeoutTimer.C:
|
|
// Header retrieval timed out, update the metrics
|
|
p.log.Debug("Header request timed out", "elapsed", ttl)
|
|
headerTimeoutMeter.Mark(1)
|
|
|
|
return nil, nil, errTimeout
|
|
|
|
case res := <-resCh:
|
|
// Headers successfully retrieved, update the metrics
|
|
headerReqTimer.Update(time.Since(start))
|
|
headerInMeter.Mark(int64(len(*res.Res.(*eth.BlockHeadersPacket))))
|
|
|
|
// Don't reject the packet even if it turns out to be bad, downloader will
|
|
// disconnect the peer on its own terms. Simply delivery the headers to
|
|
// be processed by the caller
|
|
res.Done <- nil
|
|
|
|
return *res.Res.(*eth.BlockHeadersPacket), res.Meta.([]common.Hash), nil
|
|
}
|
|
}
|
|
|
|
// fetchHeadersByNumber is a blocking version of Peer.RequestHeadersByNumber which
|
|
// handles all the cancellation, interruption and timeout mechanisms of a data
|
|
// retrieval to allow blocking API calls.
|
|
func (d *Downloader) fetchHeadersByNumber(p *peerConnection, number uint64, amount int, skip int, reverse bool) ([]*types.Header, []common.Hash, error) {
|
|
// Create the response sink and send the network request
|
|
start := time.Now()
|
|
resCh := make(chan *eth.Response)
|
|
|
|
req, err := p.peer.RequestHeadersByNumber(number, amount, skip, reverse, resCh)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
defer req.Close()
|
|
|
|
// Wait until the response arrives, the request is cancelled or times out
|
|
ttl := d.peers.rates.TargetTimeout()
|
|
|
|
timeoutTimer := time.NewTimer(ttl)
|
|
defer timeoutTimer.Stop()
|
|
|
|
select {
|
|
case <-d.cancelCh:
|
|
return nil, nil, errCanceled
|
|
|
|
case <-timeoutTimer.C:
|
|
// Header retrieval timed out, update the metrics
|
|
p.log.Debug("Header request timed out", "elapsed", ttl)
|
|
headerTimeoutMeter.Mark(1)
|
|
|
|
return nil, nil, errTimeout
|
|
|
|
case res := <-resCh:
|
|
// Headers successfully retrieved, update the metrics
|
|
headerReqTimer.Update(time.Since(start))
|
|
headerInMeter.Mark(int64(len(*res.Res.(*eth.BlockHeadersPacket))))
|
|
|
|
// Don't reject the packet even if it turns out to be bad, downloader will
|
|
// disconnect the peer on its own terms. Simply delivery the headers to
|
|
// be processed by the caller
|
|
res.Done <- nil
|
|
|
|
return *res.Res.(*eth.BlockHeadersPacket), res.Meta.([]common.Hash), nil
|
|
}
|
|
}
|