98 lines
3.8 KiB
Go
98 lines
3.8 KiB
Go
// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package downloader
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import (
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/eth/protocols/eth"
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"github.com/ethereum/go-ethereum/log"
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)
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// headerQueue implements typedQueue and is a type adapter between the generic
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// concurrent fetcher and the downloader.
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type headerQueue Downloader
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// waker returns a notification channel that gets pinged in case more header
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// fetches have been queued up, so the fetcher might assign it to idle peers.
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func (q *headerQueue) waker() chan bool {
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return q.queue.headerContCh
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}
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// pending returns the number of headers that are currently queued for fetching
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// by the concurrent downloader.
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func (q *headerQueue) pending() int {
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return q.queue.PendingHeaders()
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}
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// capacity is responsible for calculating how many headers a particular peer is
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// estimated to be able to retrieve within the alloted round trip time.
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func (q *headerQueue) capacity(peer *peerConnection, rtt time.Duration) int {
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return peer.HeaderCapacity(rtt)
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}
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// updateCapacity is responsible for updating how many headers a particular peer
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// is estimated to be able to retrieve in a unit time.
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func (q *headerQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
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peer.UpdateHeaderRate(items, span)
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}
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// reserve is responsible for allocating a requested number of pending headers
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// from the download queue to the specified peer.
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func (q *headerQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
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return q.queue.ReserveHeaders(peer, items), false, false
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}
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// unreserve is resposible for removing the current header retrieval allocation
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// assigned to a specific peer and placing it back into the pool to allow
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// reassigning to some other peer.
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func (q *headerQueue) unreserve(peer string) int {
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fails := q.queue.ExpireHeaders(peer)
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if fails > 2 {
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log.Trace("Header delivery timed out", "peer", peer)
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} else {
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log.Debug("Header delivery stalling", "peer", peer)
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}
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return fails
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}
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// request is responsible for converting a generic fetch request into a header
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// one and sending it to the remote peer for fulfillment.
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func (q *headerQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
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peer.log.Trace("Requesting new batch of headers", "from", req.From)
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return peer.peer.RequestHeadersByNumber(req.From, MaxHeaderFetch, 0, false, resCh)
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}
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// deliver is responsible for taking a generic response packet from the concurrent
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// fetcher, unpacking the header data and delivering it to the downloader's queue.
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func (q *headerQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
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headers := *packet.Res.(*eth.BlockHeadersPacket)
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hashes := packet.Meta.([]common.Hash)
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accepted, err := q.queue.DeliverHeaders(peer.id, headers, hashes, q.headerProcCh)
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switch {
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case err == nil && len(headers) == 0:
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peer.log.Trace("Requested headers delivered")
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case err == nil:
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peer.log.Trace("Delivered new batch of headers", "count", len(headers), "accepted", accepted)
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default:
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peer.log.Debug("Failed to deliver retrieved headers", "err", err)
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}
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return accepted, err
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}
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