2015-04-12 03:38:25 -07:00
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package downloader
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import (
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"errors"
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"fmt"
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2015-04-12 03:38:25 -07:00
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"math"
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"math/big"
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"sync"
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"sync/atomic"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"gopkg.in/fatih/set.v0"
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)
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const (
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maxBlockFetch = 256 // Amount of max blocks to be fetched per chunk
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minDesiredPeerCount = 5 // Amount of peers desired to start syncing
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peerCountTimeout = 12 * time.Second // Amount of time it takes for the peer handler to ignore minDesiredPeerCount
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blockTtl = 15 * time.Second // The amount of time it takes for a block request to time out
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hashTtl = 20 * time.Second // The amount of time it takes for a hash request to time out
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)
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2015-04-17 16:10:32 -07:00
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var (
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errLowTd = errors.New("peer's TD is too low")
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errBusy = errors.New("busy")
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errUnknownPeer = errors.New("peer's unknown or unhealthy")
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)
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type hashCheckFn func(common.Hash) bool
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type chainInsertFn func(types.Blocks) error
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type hashIterFn func() (common.Hash, error)
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type currentTdFn func() *big.Int
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type Downloader struct {
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mu sync.RWMutex
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queue *queue
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peers peers
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activePeer string
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// Callbacks
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hasBlock hashCheckFn
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insertChain chainInsertFn
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currentTd currentTdFn
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// Status
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fetchingHashes int32
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downloadingBlocks int32
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processingBlocks int32
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// Channels
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newPeerCh chan *peer
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syncCh chan syncPack
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hashCh chan []common.Hash
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blockCh chan blockPack
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quit chan struct{}
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}
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type blockPack struct {
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peerId string
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blocks []*types.Block
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}
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type syncPack struct {
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peer *peer
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hash common.Hash
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ignoreInitial bool
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}
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func New(hasBlock hashCheckFn, insertChain chainInsertFn, currentTd currentTdFn) *Downloader {
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downloader := &Downloader{
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queue: newqueue(),
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peers: make(peers),
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hasBlock: hasBlock,
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insertChain: insertChain,
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currentTd: currentTd,
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newPeerCh: make(chan *peer, 1),
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syncCh: make(chan syncPack, 1),
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hashCh: make(chan []common.Hash, 1),
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blockCh: make(chan blockPack, 1),
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quit: make(chan struct{}),
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}
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go downloader.peerHandler()
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go downloader.update()
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return downloader
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}
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func (d *Downloader) RegisterPeer(id string, td *big.Int, hash common.Hash, getHashes hashFetcherFn, getBlocks blockFetcherFn) error {
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d.mu.Lock()
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defer d.mu.Unlock()
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glog.V(logger.Detail).Infoln("Register peer", id, "TD =", td)
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// Create a new peer and add it to the list of known peers
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peer := newPeer(id, td, hash, getHashes, getBlocks)
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// add peer to our peer set
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d.peers[id] = peer
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// broadcast new peer
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d.newPeerCh <- peer
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return nil
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}
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// UnregisterPeer unregister's a peer. This will prevent any action from the specified peer.
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func (d *Downloader) UnregisterPeer(id string) {
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d.mu.Lock()
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defer d.mu.Unlock()
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glog.V(logger.Detail).Infoln("Unregister peer", id)
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delete(d.peers, id)
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}
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// SynchroniseWithPeer will select the peer and use it for synchronising. If an empty string is given
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// it will use the best peer possible and synchronise if it's TD is higher than our own. If any of the
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// checks fail an error will be returned. This method is synchronous
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func (d *Downloader) SynchroniseWithPeer(id string) (types.Blocks, error) {
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// Check if we're busy
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if d.isBusy() {
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return nil, errBusy
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}
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// Attempt to select a peer. This can either be nothing, which returns, best peer
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// or selected peer. If no peer could be found an error will be returned
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var p *peer
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if len(id) == 0 {
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p = d.peers[id]
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if p == nil {
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return nil, errUnknownPeer
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}
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} else {
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p = d.peers.bestPeer()
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}
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// Make sure our td is lower than the peer's td
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if p.td.Cmp(d.currentTd()) <= 0 || d.hasBlock(p.recentHash) {
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return nil, errLowTd
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}
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// Get the hash from the peer and initiate the downloading progress.
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err := d.getFromPeer(p, p.recentHash, false)
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if err != nil {
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return nil, err
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}
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return d.queue.blocks, nil
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}
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// Synchronise will synchronise using the best peer.
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func (d *Downloader) Synchronise() (types.Blocks, error) {
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return d.SynchroniseWithPeer("")
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}
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func (d *Downloader) getFromPeer(p *peer, hash common.Hash, ignoreInitial bool) error {
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glog.V(logger.Detail).Infoln("Synchronising with the network using:", p.id)
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// Start the fetcher. This will block the update entirely
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// interupts need to be send to the appropriate channels
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// respectively.
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if err := d.startFetchingHashes(p, hash, ignoreInitial); err != nil {
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// handle error
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glog.V(logger.Debug).Infoln("Error fetching hashes:", err)
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// XXX Reset
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return err
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}
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// Start fetching blocks in paralel. The strategy is simple
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// take any available peers, seserve a chunk for each peer available,
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// let the peer deliver the chunkn and periodically check if a peer
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// has timedout. When done downloading, process blocks.
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if err := d.startFetchingBlocks(p); err != nil {
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glog.V(logger.Debug).Infoln("Error downloading blocks:", err)
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// XXX reset
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return err
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}
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glog.V(logger.Detail).Infoln("Sync completed")
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return nil
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}
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func (d *Downloader) peerHandler() {
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// itimer is used to determine when to start ignoring `minDesiredPeerCount`
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itimer := time.NewTimer(peerCountTimeout)
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out:
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for {
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select {
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case <-d.newPeerCh:
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itimer.Stop()
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// Meet the `minDesiredPeerCount` before we select our best peer
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if len(d.peers) < minDesiredPeerCount {
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break
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}
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2015-04-13 07:38:32 -07:00
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d.selectPeer(d.peers.bestPeer())
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case <-itimer.C:
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// The timer will make sure that the downloader keeps an active state
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// in which it attempts to always check the network for highest td peers
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2015-04-17 16:10:32 -07:00
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// Either select the peer or restart the timer if no peers could
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// be selected.
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if peer := d.peers.bestPeer(); peer != nil {
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d.selectPeer(d.peers.bestPeer())
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} else {
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itimer.Reset(5 * time.Second)
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}
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2015-04-12 03:38:25 -07:00
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case <-d.quit:
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break out
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}
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}
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}
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2015-04-13 07:38:32 -07:00
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func (d *Downloader) selectPeer(p *peer) {
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// Make sure it's doing neither. Once done we can restart the
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// downloading process if the TD is higher. For now just get on
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// with whatever is going on. This prevents unecessary switching.
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2015-04-17 18:15:26 -07:00
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if !d.isBusy() {
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2015-04-13 07:38:32 -07:00
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// selected peer must be better than our own
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// XXX we also check the peer's recent hash to make sure we
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// don't have it. Some peers report (i think) incorrect TD.
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if p.td.Cmp(d.currentTd()) <= 0 || d.hasBlock(p.recentHash) {
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return
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}
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glog.V(logger.Detail).Infoln("New peer with highest TD =", p.td)
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2015-04-15 15:14:31 -07:00
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d.syncCh <- syncPack{p, p.recentHash, false}
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}
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2015-04-17 16:10:32 -07:00
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2015-04-13 07:38:32 -07:00
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}
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2015-04-12 03:38:25 -07:00
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func (d *Downloader) update() {
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out:
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for {
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select {
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2015-04-13 07:38:32 -07:00
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case sync := <-d.syncCh:
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2015-04-18 08:35:03 -07:00
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start := time.Now()
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var peer *peer = sync.peer
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d.activePeer = peer.id
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glog.V(logger.Detail).Infoln("Synchronising with the network using:", peer.id)
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2015-04-13 07:38:32 -07:00
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// Start the fetcher. This will block the update entirely
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// interupts need to be send to the appropriate channels
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// respectively.
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2015-04-18 08:35:03 -07:00
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if err := d.startFetchingHashes(peer, sync.hash, sync.ignoreInitial); err != nil {
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2015-04-13 07:38:32 -07:00
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// handle error
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glog.V(logger.Debug).Infoln("Error fetching hashes:", err)
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// XXX Reset
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break
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}
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2015-04-12 03:38:25 -07:00
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2015-04-13 07:38:32 -07:00
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// Start fetching blocks in paralel. The strategy is simple
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// take any available peers, seserve a chunk for each peer available,
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// let the peer deliver the chunkn and periodically check if a peer
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// has timedout. When done downloading, process blocks.
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2015-04-18 08:35:03 -07:00
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if err := d.startFetchingBlocks(peer); err != nil {
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2015-04-13 07:38:32 -07:00
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glog.V(logger.Debug).Infoln("Error downloading blocks:", err)
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// XXX reset
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break
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2015-04-12 03:38:25 -07:00
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}
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2015-04-13 07:38:32 -07:00
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2015-04-18 08:35:03 -07:00
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glog.V(logger.Detail).Infoln("Network sync completed in", time.Since(start))
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2015-04-13 07:38:32 -07:00
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d.process()
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2015-04-12 03:38:25 -07:00
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case <-d.quit:
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break out
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}
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}
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}
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2015-04-13 07:38:32 -07:00
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// XXX Make synchronous
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2015-04-15 15:14:31 -07:00
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func (d *Downloader) startFetchingHashes(p *peer, hash common.Hash, ignoreInitial bool) error {
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2015-04-18 06:14:12 -07:00
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atomic.StoreInt32(&d.fetchingHashes, 1)
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defer atomic.StoreInt32(&d.fetchingHashes, 0)
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2015-04-15 15:14:31 -07:00
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glog.V(logger.Debug).Infof("Downloading hashes (%x) from %s", hash.Bytes()[:4], p.id)
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2015-04-12 03:38:25 -07:00
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start := time.Now()
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2015-04-15 15:14:31 -07:00
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// We ignore the initial hash in some cases (e.g. we received a block without it's parent)
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// In such circumstances we don't need to download the block so don't add it to the queue.
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if !ignoreInitial {
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// Add the hash to the queue first
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d.queue.hashPool.Add(hash)
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}
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2015-04-12 03:38:25 -07:00
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// Get the first batch of hashes
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2015-04-13 07:38:32 -07:00
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p.getHashes(hash)
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2015-04-12 03:38:25 -07:00
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2015-04-18 08:35:03 -07:00
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failureResponse := time.NewTimer(hashTtl)
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2015-04-12 03:38:25 -07:00
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out:
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for {
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select {
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2015-04-18 08:35:03 -07:00
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case hashes := <-d.hashCh:
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2015-04-12 03:38:25 -07:00
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var done bool // determines whether we're done fetching hashes (i.e. common hash found)
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hashSet := set.New()
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for _, hash := range hashes {
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if d.hasBlock(hash) {
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2015-04-15 15:14:31 -07:00
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glog.V(logger.Debug).Infof("Found common hash %x\n", hash[:4])
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2015-04-12 03:38:25 -07:00
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done = true
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break
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}
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hashSet.Add(hash)
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}
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d.queue.put(hashSet)
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// Add hashes to the chunk set
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2015-04-18 06:14:12 -07:00
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if len(hashes) == 0 { // Make sure the peer actually gave you something valid
|
|
|
|
glog.V(logger.Debug).Infof("Peer (%s) responded with empty hash set\n", p.id)
|
|
|
|
d.queue.reset()
|
|
|
|
|
|
|
|
break out
|
|
|
|
} else if !done { // Check if we're done fetching
|
2015-04-12 03:38:25 -07:00
|
|
|
//fmt.Println("re-fetch. current =", d.queue.hashPool.Size())
|
|
|
|
// Get the next set of hashes
|
|
|
|
p.getHashes(hashes[len(hashes)-1])
|
2015-04-18 06:14:12 -07:00
|
|
|
} else { // we're done
|
2015-04-12 03:38:25 -07:00
|
|
|
break out
|
|
|
|
}
|
2015-04-18 08:35:03 -07:00
|
|
|
case <-failureResponse.C:
|
|
|
|
glog.V(logger.Debug).Infof("Peer (%s) didn't respond in time for hash request\n", p.id)
|
|
|
|
d.queue.reset()
|
|
|
|
|
|
|
|
break out
|
2015-04-12 03:38:25 -07:00
|
|
|
}
|
|
|
|
}
|
2015-04-18 08:35:03 -07:00
|
|
|
glog.V(logger.Detail).Infof("Downloaded hashes (%d) in %v\n", d.queue.hashPool.Size(), time.Since(start))
|
2015-04-12 03:38:25 -07:00
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (d *Downloader) startFetchingBlocks(p *peer) error {
|
2015-04-18 08:35:03 -07:00
|
|
|
glog.V(logger.Detail).Infoln("Downloading", d.queue.hashPool.Size(), "block(s)")
|
2015-04-12 03:38:25 -07:00
|
|
|
atomic.StoreInt32(&d.downloadingBlocks, 1)
|
2015-04-18 06:14:12 -07:00
|
|
|
defer atomic.StoreInt32(&d.downloadingBlocks, 0)
|
2015-04-12 03:38:25 -07:00
|
|
|
|
|
|
|
start := time.Now()
|
|
|
|
|
|
|
|
// default ticker for re-fetching blocks everynow and then
|
|
|
|
ticker := time.NewTicker(20 * time.Millisecond)
|
|
|
|
out:
|
|
|
|
for {
|
|
|
|
select {
|
|
|
|
case blockPack := <-d.blockCh:
|
2015-04-17 16:10:32 -07:00
|
|
|
// If the peer was previously banned and failed to deliver it's pack
|
|
|
|
// in a reasonable time frame, ignore it's message.
|
|
|
|
if d.peers[blockPack.peerId] != nil {
|
|
|
|
d.peers[blockPack.peerId].promote()
|
|
|
|
d.queue.deliver(blockPack.peerId, blockPack.blocks)
|
|
|
|
d.peers.setState(blockPack.peerId, idleState)
|
|
|
|
}
|
2015-04-12 03:38:25 -07:00
|
|
|
case <-ticker.C:
|
|
|
|
// If there are unrequested hashes left start fetching
|
|
|
|
// from the available peers.
|
|
|
|
if d.queue.hashPool.Size() > 0 {
|
|
|
|
availablePeers := d.peers.get(idleState)
|
|
|
|
for _, peer := range availablePeers {
|
|
|
|
// Get a possible chunk. If nil is returned no chunk
|
|
|
|
// could be returned due to no hashes available.
|
|
|
|
chunk := d.queue.get(peer, maxBlockFetch)
|
2015-04-13 07:38:32 -07:00
|
|
|
if chunk == nil {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
//fmt.Println("fetching for", peer.id)
|
|
|
|
// XXX make fetch blocking.
|
|
|
|
// Fetch the chunk and check for error. If the peer was somehow
|
|
|
|
// already fetching a chunk due to a bug, it will be returned to
|
|
|
|
// the queue
|
|
|
|
if err := peer.fetch(chunk); err != nil {
|
|
|
|
// log for tracing
|
|
|
|
glog.V(logger.Debug).Infof("peer %s received double work (state = %v)\n", peer.id, peer.state)
|
|
|
|
d.queue.put(chunk.hashes)
|
2015-04-12 03:38:25 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
atomic.StoreInt32(&d.downloadingBlocks, 1)
|
|
|
|
} else if len(d.queue.fetching) == 0 {
|
2015-04-13 07:38:32 -07:00
|
|
|
// When there are no more queue and no more `fetching`. We can
|
2015-04-12 03:38:25 -07:00
|
|
|
// safely assume we're done. Another part of the process will check
|
|
|
|
// for parent errors and will re-request anything that's missing
|
|
|
|
break out
|
|
|
|
} else {
|
|
|
|
// Check for bad peers. Bad peers may indicate a peer not responding
|
|
|
|
// to a `getBlocks` message. A timeout of 5 seconds is set. Peers
|
|
|
|
// that badly or poorly behave are removed from the peer set (not banned).
|
|
|
|
// Bad peers are excluded from the available peer set and therefor won't be
|
|
|
|
// reused. XXX We could re-introduce peers after X time.
|
|
|
|
d.queue.mu.Lock()
|
|
|
|
var badPeers []string
|
|
|
|
for pid, chunk := range d.queue.fetching {
|
2015-04-18 06:14:12 -07:00
|
|
|
if time.Since(chunk.itime) > blockTtl {
|
2015-04-12 03:38:25 -07:00
|
|
|
badPeers = append(badPeers, pid)
|
|
|
|
// remove peer as good peer from peer list
|
|
|
|
d.UnregisterPeer(pid)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
d.queue.mu.Unlock()
|
|
|
|
|
|
|
|
for _, pid := range badPeers {
|
|
|
|
// A nil chunk is delivered so that the chunk's hashes are given
|
|
|
|
// back to the queue objects. When hashes are put back in the queue
|
|
|
|
// other (decent) peers can pick them up.
|
|
|
|
// XXX We could make use of a reputation system here ranking peers
|
|
|
|
// in their performance
|
|
|
|
// 1) Time for them to respond;
|
|
|
|
// 2) Measure their speed;
|
|
|
|
// 3) Amount and availability.
|
|
|
|
d.queue.deliver(pid, nil)
|
2015-04-16 15:11:41 -07:00
|
|
|
if peer := d.peers[pid]; peer != nil {
|
2015-04-15 17:16:33 -07:00
|
|
|
peer.demote()
|
|
|
|
}
|
2015-04-12 03:38:25 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
//fmt.Println(d.queue.hashPool.Size(), len(d.queue.fetching))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-04-18 08:35:03 -07:00
|
|
|
glog.V(logger.Detail).Infoln("Downloaded block(s) in", time.Since(start))
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (d *Downloader) AddHashes(id string, hashes []common.Hash) error {
|
|
|
|
// make sure that the hashes that are being added are actually from the peer
|
|
|
|
// that's the current active peer. hashes that have been received from other
|
|
|
|
// peers are dropped and ignored.
|
|
|
|
if d.activePeer != id {
|
|
|
|
return fmt.Errorf("received hashes from %s while active peer is %s", id, d.activePeer)
|
|
|
|
}
|
|
|
|
|
|
|
|
d.hashCh <- hashes
|
2015-04-12 03:38:25 -07:00
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2015-04-13 07:38:32 -07:00
|
|
|
// Add an (unrequested) block to the downloader. This is usually done through the
|
|
|
|
// NewBlockMsg by the protocol handler.
|
|
|
|
func (d *Downloader) AddBlock(id string, block *types.Block, td *big.Int) {
|
|
|
|
hash := block.Hash()
|
|
|
|
|
|
|
|
if d.hasBlock(hash) {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
2015-04-15 15:14:31 -07:00
|
|
|
peer := d.peers.getPeer(id)
|
2015-04-13 07:38:32 -07:00
|
|
|
// if the peer is in our healthy list of peers; update the td
|
2015-04-15 15:14:31 -07:00
|
|
|
// and add the block. Otherwise just ignore it
|
|
|
|
if peer == nil {
|
|
|
|
glog.V(logger.Detail).Infof("Ignored block from bad peer %s\n", id)
|
|
|
|
return
|
2015-04-13 07:38:32 -07:00
|
|
|
}
|
|
|
|
|
2015-04-15 15:14:31 -07:00
|
|
|
peer.mu.Lock()
|
|
|
|
peer.td = td
|
|
|
|
peer.recentHash = block.Hash()
|
|
|
|
peer.mu.Unlock()
|
2015-04-15 17:16:33 -07:00
|
|
|
peer.promote()
|
2015-04-15 15:14:31 -07:00
|
|
|
|
|
|
|
glog.V(logger.Detail).Infoln("Inserting new block from:", id)
|
|
|
|
d.queue.addBlock(id, block, td)
|
|
|
|
|
2015-04-13 07:38:32 -07:00
|
|
|
// if neither go ahead to process
|
2015-04-17 18:15:26 -07:00
|
|
|
if !d.isBusy() {
|
2015-04-15 15:14:31 -07:00
|
|
|
// Check if the parent of the received block is known.
|
|
|
|
// If the block is not know, request it otherwise, request.
|
|
|
|
phash := block.ParentHash()
|
|
|
|
if !d.hasBlock(phash) {
|
|
|
|
glog.V(logger.Detail).Infof("Missing parent %x, requires fetching\n", phash.Bytes()[:4])
|
|
|
|
d.syncCh <- syncPack{peer, peer.recentHash, true}
|
|
|
|
} else {
|
|
|
|
d.process()
|
|
|
|
}
|
2015-04-13 07:38:32 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Deliver a chunk to the downloader. This is usually done through the BlocksMsg by
|
|
|
|
// the protocol handler.
|
|
|
|
func (d *Downloader) DeliverChunk(id string, blocks []*types.Block) {
|
|
|
|
d.blockCh <- blockPack{id, blocks}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (d *Downloader) process() error {
|
|
|
|
atomic.StoreInt32(&d.processingBlocks, 1)
|
|
|
|
defer atomic.StoreInt32(&d.processingBlocks, 0)
|
|
|
|
|
|
|
|
// XXX this will move when optimised
|
|
|
|
// Sort the blocks by number. This bit needs much improvement. Right now
|
|
|
|
// it assumes full honesty form peers (i.e. it's not checked when the blocks
|
|
|
|
// link). We should at least check whihc queue match. This code could move
|
|
|
|
// to a seperate goroutine where it periodically checks for linked pieces.
|
|
|
|
types.BlockBy(types.Number).Sort(d.queue.blocks)
|
|
|
|
blocks := d.queue.blocks
|
2015-04-18 06:14:12 -07:00
|
|
|
if len(blocks) == 0 {
|
|
|
|
return nil
|
|
|
|
}
|
2015-04-13 07:38:32 -07:00
|
|
|
|
2015-04-18 06:14:12 -07:00
|
|
|
glog.V(logger.Debug).Infof("Inserting chain with %d blocks (#%v - #%v)\n", len(blocks), blocks[0].Number(), blocks[len(blocks)-1].Number())
|
2015-04-13 07:38:32 -07:00
|
|
|
|
|
|
|
var err error
|
|
|
|
// Loop untill we're out of blocks
|
|
|
|
for len(blocks) != 0 {
|
|
|
|
max := int(math.Min(float64(len(blocks)), 256))
|
|
|
|
// TODO check for parent error. When there's a parent error we should stop
|
|
|
|
// processing and start requesting the `block.hash` so that it's parent and
|
|
|
|
// grandparents can be requested and queued.
|
|
|
|
err = d.insertChain(blocks[:max])
|
|
|
|
if err != nil && core.IsParentErr(err) {
|
|
|
|
glog.V(logger.Debug).Infoln("Aborting process due to missing parent. Fetching hashes")
|
|
|
|
|
|
|
|
// TODO change this. This shite
|
|
|
|
for i, block := range blocks[:max] {
|
|
|
|
if !d.hasBlock(block.ParentHash()) {
|
2015-04-15 15:14:31 -07:00
|
|
|
d.syncCh <- syncPack{d.peers.bestPeer(), block.Hash(), true}
|
2015-04-13 07:38:32 -07:00
|
|
|
// remove processed blocks
|
|
|
|
blocks = blocks[i:]
|
|
|
|
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break
|
2015-04-18 06:14:12 -07:00
|
|
|
} else if err != nil {
|
|
|
|
// Reset chain completely. This needs much, much improvement.
|
|
|
|
// instead: check all blocks leading down to this block false block and remove it
|
|
|
|
blocks = nil
|
|
|
|
break
|
2015-04-13 07:38:32 -07:00
|
|
|
}
|
|
|
|
blocks = blocks[max:]
|
|
|
|
}
|
|
|
|
|
|
|
|
// This will allow the GC to remove the in memory blocks
|
|
|
|
if len(blocks) == 0 {
|
|
|
|
d.queue.blocks = nil
|
|
|
|
} else {
|
|
|
|
d.queue.blocks = blocks
|
|
|
|
}
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
2015-04-12 03:38:25 -07:00
|
|
|
func (d *Downloader) isFetchingHashes() bool {
|
|
|
|
return atomic.LoadInt32(&d.fetchingHashes) == 1
|
|
|
|
}
|
|
|
|
|
|
|
|
func (d *Downloader) isDownloadingBlocks() bool {
|
|
|
|
return atomic.LoadInt32(&d.downloadingBlocks) == 1
|
|
|
|
}
|
2015-04-13 07:38:32 -07:00
|
|
|
|
|
|
|
func (d *Downloader) isProcessing() bool {
|
|
|
|
return atomic.LoadInt32(&d.processingBlocks) == 1
|
|
|
|
}
|
2015-04-17 18:15:26 -07:00
|
|
|
|
|
|
|
func (d *Downloader) isBusy() bool {
|
|
|
|
return d.isFetchingHashes() || d.isDownloadingBlocks() || d.isProcessing()
|
|
|
|
}
|