273 lines
7.3 KiB
Go
273 lines
7.3 KiB
Go
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// Copyright 2018 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 stream
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import (
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"errors"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/swarm/log"
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"github.com/ethereum/go-ethereum/swarm/network"
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"github.com/ethereum/go-ethereum/swarm/storage"
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)
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const (
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swarmChunkServerStreamName = "RETRIEVE_REQUEST"
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deliveryCap = 32
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)
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var (
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processReceivedChunksCount = metrics.NewRegisteredCounter("network.stream.received_chunks.count", nil)
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handleRetrieveRequestMsgCount = metrics.NewRegisteredCounter("network.stream.handle_retrieve_request_msg.count", nil)
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requestFromPeersCount = metrics.NewRegisteredCounter("network.stream.request_from_peers.count", nil)
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requestFromPeersEachCount = metrics.NewRegisteredCounter("network.stream.request_from_peers_each.count", nil)
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)
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type Delivery struct {
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db *storage.DBAPI
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overlay network.Overlay
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receiveC chan *ChunkDeliveryMsg
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getPeer func(discover.NodeID) *Peer
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}
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func NewDelivery(overlay network.Overlay, db *storage.DBAPI) *Delivery {
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d := &Delivery{
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db: db,
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overlay: overlay,
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receiveC: make(chan *ChunkDeliveryMsg, deliveryCap),
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}
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go d.processReceivedChunks()
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return d
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}
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// SwarmChunkServer implements Server
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type SwarmChunkServer struct {
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deliveryC chan []byte
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batchC chan []byte
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db *storage.DBAPI
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currentLen uint64
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quit chan struct{}
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}
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// NewSwarmChunkServer is SwarmChunkServer constructor
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func NewSwarmChunkServer(db *storage.DBAPI) *SwarmChunkServer {
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s := &SwarmChunkServer{
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deliveryC: make(chan []byte, deliveryCap),
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batchC: make(chan []byte),
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db: db,
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quit: make(chan struct{}),
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}
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go s.processDeliveries()
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return s
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}
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// processDeliveries handles delivered chunk hashes
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func (s *SwarmChunkServer) processDeliveries() {
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var hashes []byte
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var batchC chan []byte
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for {
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select {
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case <-s.quit:
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return
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case hash := <-s.deliveryC:
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hashes = append(hashes, hash...)
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batchC = s.batchC
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case batchC <- hashes:
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hashes = nil
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batchC = nil
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}
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}
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}
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// SetNextBatch
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func (s *SwarmChunkServer) SetNextBatch(_, _ uint64) (hashes []byte, from uint64, to uint64, proof *HandoverProof, err error) {
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select {
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case hashes = <-s.batchC:
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case <-s.quit:
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return
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}
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from = s.currentLen
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s.currentLen += uint64(len(hashes))
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to = s.currentLen
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return
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}
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// Close needs to be called on a stream server
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func (s *SwarmChunkServer) Close() {
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close(s.quit)
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}
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// GetData retrives chunk data from db store
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func (s *SwarmChunkServer) GetData(key []byte) ([]byte, error) {
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chunk, err := s.db.Get(storage.Address(key))
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if err == storage.ErrFetching {
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<-chunk.ReqC
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} else if err != nil {
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return nil, err
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}
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return chunk.SData, nil
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}
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// RetrieveRequestMsg is the protocol msg for chunk retrieve requests
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type RetrieveRequestMsg struct {
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Addr storage.Address
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SkipCheck bool
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}
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func (d *Delivery) handleRetrieveRequestMsg(sp *Peer, req *RetrieveRequestMsg) error {
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log.Trace("received request", "peer", sp.ID(), "hash", req.Addr)
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handleRetrieveRequestMsgCount.Inc(1)
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s, err := sp.getServer(NewStream(swarmChunkServerStreamName, "", false))
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if err != nil {
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return err
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}
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streamer := s.Server.(*SwarmChunkServer)
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chunk, created := d.db.GetOrCreateRequest(req.Addr)
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if chunk.ReqC != nil {
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if created {
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if err := d.RequestFromPeers(chunk.Addr[:], true, sp.ID()); err != nil {
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log.Warn("unable to forward chunk request", "peer", sp.ID(), "key", chunk.Addr, "err", err)
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chunk.SetErrored(storage.ErrChunkForward)
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return nil
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}
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}
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go func() {
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t := time.NewTimer(10 * time.Minute)
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defer t.Stop()
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log.Debug("waiting delivery", "peer", sp.ID(), "hash", req.Addr, "node", common.Bytes2Hex(d.overlay.BaseAddr()), "created", created)
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start := time.Now()
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select {
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case <-chunk.ReqC:
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log.Debug("retrieve request ReqC closed", "peer", sp.ID(), "hash", req.Addr, "time", time.Since(start))
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case <-t.C:
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log.Debug("retrieve request timeout", "peer", sp.ID(), "hash", req.Addr)
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chunk.SetErrored(storage.ErrChunkTimeout)
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return
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}
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chunk.SetErrored(nil)
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if req.SkipCheck {
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err := sp.Deliver(chunk, s.priority)
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if err != nil {
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log.Warn("ERROR in handleRetrieveRequestMsg, DROPPING peer!", "err", err)
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sp.Drop(err)
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}
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}
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streamer.deliveryC <- chunk.Addr[:]
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}()
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return nil
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}
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// TODO: call the retrieve function of the outgoing syncer
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if req.SkipCheck {
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log.Trace("deliver", "peer", sp.ID(), "hash", chunk.Addr)
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if length := len(chunk.SData); length < 9 {
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log.Error("Chunk.SData to deliver is too short", "len(chunk.SData)", length, "address", chunk.Addr)
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}
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return sp.Deliver(chunk, s.priority)
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}
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streamer.deliveryC <- chunk.Addr[:]
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return nil
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}
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type ChunkDeliveryMsg struct {
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Addr storage.Address
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SData []byte // the stored chunk Data (incl size)
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peer *Peer // set in handleChunkDeliveryMsg
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}
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func (d *Delivery) handleChunkDeliveryMsg(sp *Peer, req *ChunkDeliveryMsg) error {
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req.peer = sp
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d.receiveC <- req
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return nil
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}
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func (d *Delivery) processReceivedChunks() {
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R:
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for req := range d.receiveC {
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processReceivedChunksCount.Inc(1)
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// this should be has locally
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chunk, err := d.db.Get(req.Addr)
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if err == nil {
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continue R
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}
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if err != storage.ErrFetching {
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log.Error("processReceivedChunks db error", "addr", req.Addr, "err", err, "chunk", chunk)
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continue R
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}
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select {
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case <-chunk.ReqC:
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log.Error("someone else delivered?", "hash", chunk.Addr.Hex())
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continue R
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default:
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}
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chunk.SData = req.SData
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d.db.Put(chunk)
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go func(req *ChunkDeliveryMsg) {
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err := chunk.WaitToStore()
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if err == storage.ErrChunkInvalid {
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req.peer.Drop(err)
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}
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}(req)
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}
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}
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// RequestFromPeers sends a chunk retrieve request to
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func (d *Delivery) RequestFromPeers(hash []byte, skipCheck bool, peersToSkip ...discover.NodeID) error {
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var success bool
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var err error
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requestFromPeersCount.Inc(1)
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d.overlay.EachConn(hash, 255, func(p network.OverlayConn, po int, nn bool) bool {
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spId := p.(network.Peer).ID()
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for _, p := range peersToSkip {
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if p == spId {
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log.Trace("Delivery.RequestFromPeers: skip peer", "peer", spId)
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return true
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}
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}
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sp := d.getPeer(spId)
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if sp == nil {
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log.Warn("Delivery.RequestFromPeers: peer not found", "id", spId)
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return true
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}
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// TODO: skip light nodes that do not accept retrieve requests
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err = sp.SendPriority(&RetrieveRequestMsg{
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Addr: hash,
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SkipCheck: skipCheck,
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}, Top)
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if err != nil {
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return true
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}
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requestFromPeersEachCount.Inc(1)
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success = true
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return false
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})
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if success {
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return nil
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}
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return errors.New("no peer found")
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}
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