c10a0a62c3
* eth: request ID based message dispatcher * eth: fix dispatcher cancellation, rework fetchers idleness tracker * eth/downloader: drop peers who refuse to serve advertised chains
96 lines
3.8 KiB
Go
96 lines
3.8 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/eth/protocols/eth"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
)
|
|
|
|
// headerQueue implements typedQueue and is a type adapter between the generic
|
|
// concurrent fetcher and the downloader.
|
|
type headerQueue Downloader
|
|
|
|
// waker returns a notification channel that gets pinged in case more header
|
|
// fetches have been queued up, so the fetcher might assign it to idle peers.
|
|
func (q *headerQueue) waker() chan bool {
|
|
return q.queue.headerContCh
|
|
}
|
|
|
|
// pending returns the number of headers that are currently queued for fetching
|
|
// by the concurrent downloader.
|
|
func (q *headerQueue) pending() int {
|
|
return q.queue.PendingHeaders()
|
|
}
|
|
|
|
// capacity is responsible for calculating how many headers a particular peer is
|
|
// estimated to be able to retrieve within the alloted round trip time.
|
|
func (q *headerQueue) capacity(peer *peerConnection, rtt time.Duration) int {
|
|
return peer.HeaderCapacity(rtt)
|
|
}
|
|
|
|
// updateCapacity is responsible for updating how many headers a particular peer
|
|
// is estimated to be able to retrieve in a unit time.
|
|
func (q *headerQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
|
|
peer.UpdateHeaderRate(items, span)
|
|
}
|
|
|
|
// reserve is responsible for allocating a requested number of pending headers
|
|
// from the download queue to the specified peer.
|
|
func (q *headerQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
|
|
return q.queue.ReserveHeaders(peer, items), false, false
|
|
}
|
|
|
|
// unreserve is resposible for removing the current header retrieval allocation
|
|
// assigned to a specific peer and placing it back into the pool to allow
|
|
// reassigning to some other peer.
|
|
func (q *headerQueue) unreserve(peer string) int {
|
|
fails := q.queue.ExpireHeaders(peer)
|
|
if fails > 2 {
|
|
log.Trace("Header delivery timed out", "peer", peer)
|
|
} else {
|
|
log.Debug("Header delivery stalling", "peer", peer)
|
|
}
|
|
return fails
|
|
}
|
|
|
|
// request is responsible for converting a generic fetch request into a header
|
|
// one and sending it to the remote peer for fulfillment.
|
|
func (q *headerQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
|
|
peer.log.Trace("Requesting new batch of headers", "from", req.From)
|
|
return peer.peer.RequestHeadersByNumber(req.From, MaxHeaderFetch, 0, false, resCh)
|
|
}
|
|
|
|
// deliver is responsible for taking a generic response packet from the concurrent
|
|
// fetcher, unpacking the header data and delivering it to the downloader's queue.
|
|
func (q *headerQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
|
|
headers := *packet.Res.(*eth.BlockHeadersPacket)
|
|
|
|
accepted, err := q.queue.DeliverHeaders(peer.id, headers, q.headerProcCh)
|
|
switch {
|
|
case err == nil && len(headers) == 0:
|
|
peer.log.Trace("Requested headers delivered")
|
|
case err == nil:
|
|
peer.log.Trace("Delivered new batch of headers", "count", len(headers), "accepted", accepted)
|
|
default:
|
|
peer.log.Debug("Failed to deliver retrieved headers", "err", err)
|
|
}
|
|
return accepted, err
|
|
}
|