forked from cerc-io/plugeth
106 lines
4.1 KiB
Go
106 lines
4.1 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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// bodyQueue implements typedQueue and is a type adapter between the generic
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// concurrent fetcher and the downloader.
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type bodyQueue Downloader
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// waker returns a notification channel that gets pinged in case more body
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// fetches have been queued up, so the fetcher might assign it to idle peers.
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func (q *bodyQueue) waker() chan bool {
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return q.queue.blockWakeCh
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}
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// pending returns the number of bodies that are currently queued for fetching
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// by the concurrent downloader.
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func (q *bodyQueue) pending() int {
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return q.queue.PendingBodies()
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}
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// capacity is responsible for calculating how many bodies a particular peer is
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// estimated to be able to retrieve within the allotted round trip time.
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func (q *bodyQueue) capacity(peer *peerConnection, rtt time.Duration) int {
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return peer.BodyCapacity(rtt)
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}
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// updateCapacity is responsible for updating how many bodies a particular peer
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// is estimated to be able to retrieve in a unit time.
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func (q *bodyQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
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peer.UpdateBodyRate(items, span)
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}
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// reserve is responsible for allocating a requested number of pending bodies
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// from the download queue to the specified peer.
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func (q *bodyQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
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return q.queue.ReserveBodies(peer, items)
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}
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// unreserve is responsible for removing the current body 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 *bodyQueue) unreserve(peer string) int {
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fails := q.queue.ExpireBodies(peer)
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if fails > 2 {
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log.Trace("Body delivery timed out", "peer", peer)
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} else {
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log.Debug("Body 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 body
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// one and sending it to the remote peer for fulfillment.
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func (q *bodyQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
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peer.log.Trace("Requesting new batch of bodies", "count", len(req.Headers), "from", req.Headers[0].Number)
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if q.bodyFetchHook != nil {
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q.bodyFetchHook(req.Headers)
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}
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hashes := make([]common.Hash, 0, len(req.Headers))
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for _, header := range req.Headers {
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hashes = append(hashes, header.Hash())
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}
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return peer.peer.RequestBodies(hashes, 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 body data and delivering it to the downloader's queue.
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func (q *bodyQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
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txs, uncles, withdrawals := packet.Res.(*eth.BlockBodiesResponse).Unpack()
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hashsets := packet.Meta.([][]common.Hash) // {txs hashes, uncle hashes, withdrawal hashes}
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accepted, err := q.queue.DeliverBodies(peer.id, txs, hashsets[0], uncles, hashsets[1], withdrawals, hashsets[2])
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switch {
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case err == nil && len(txs) == 0:
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peer.log.Trace("Requested bodies delivered")
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case err == nil:
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peer.log.Trace("Delivered new batch of bodies", "count", len(txs), "accepted", accepted)
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default:
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peer.log.Debug("Failed to deliver retrieved bodies", "err", err)
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}
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return accepted, err
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}
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