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387 lines
8.8 KiB
387 lines
8.8 KiB
// nolint:unused
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package v2
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import (
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"fmt"
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"math"
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"math/rand"
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"time"
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"github.com/tendermint/tendermint/p2p"
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)
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type Event interface{}
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type blockState int
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const (
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blockStateUnknown blockState = iota
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blockStateNew
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blockStatePending
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blockStateReceived
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blockStateProcessed
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)
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func (e blockState) String() string {
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switch e {
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case blockStateUnknown:
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return "Unknown"
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case blockStateNew:
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return "New"
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case blockStatePending:
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return "Pending"
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case blockStateReceived:
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return "Received"
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case blockStateProcessed:
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return "Processed"
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default:
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return fmt.Sprintf("unknown blockState: %d", e)
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}
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}
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type peerState int
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const (
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peerStateNew = iota
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peerStateReady
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peerStateRemoved
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)
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func (e peerState) String() string {
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switch e {
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case peerStateNew:
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return "New"
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case peerStateReady:
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return "Ready"
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case peerStateRemoved:
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return "Removed"
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default:
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return fmt.Sprintf("unknown peerState: %d", e)
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}
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}
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type scPeer struct {
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peerID p2p.ID
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state peerState
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height int64
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lastTouched time.Time
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lastRate int64
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}
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func newScPeer(peerID p2p.ID) *scPeer {
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return &scPeer{
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peerID: peerID,
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state: peerStateNew,
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height: -1,
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lastTouched: time.Time{},
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}
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}
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// The schedule is a composite data structure which allows a scheduler to keep
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// track of which blocks have been scheduled into which state.
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type schedule struct {
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initHeight int64
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// a list of blocks in which blockState
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blockStates map[int64]blockState
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// a map of peerID to schedule specific peer struct `scPeer` used to keep
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// track of peer specific state
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peers map[p2p.ID]*scPeer
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// a map of heights to the peer we are waiting for a response from
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pendingBlocks map[int64]p2p.ID
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// the time at which a block was put in blockStatePending
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pendingTime map[int64]time.Time
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// the peerID of the peer which put the block in blockStateReceived
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receivedBlocks map[int64]p2p.ID
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}
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func newSchedule(initHeight int64) *schedule {
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sc := schedule{
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initHeight: initHeight,
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blockStates: make(map[int64]blockState),
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peers: make(map[p2p.ID]*scPeer),
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pendingBlocks: make(map[int64]p2p.ID),
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pendingTime: make(map[int64]time.Time),
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receivedBlocks: make(map[int64]p2p.ID),
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}
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sc.setStateAtHeight(initHeight, blockStateNew)
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return &sc
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}
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func (sc *schedule) addPeer(peerID p2p.ID) error {
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if _, ok := sc.peers[peerID]; ok {
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return fmt.Errorf("Cannot add duplicate peer %s", peerID)
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}
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sc.peers[peerID] = newScPeer(peerID)
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return nil
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}
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func (sc *schedule) touchPeer(peerID p2p.ID, time time.Time) error {
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("Couldn't find peer %s", peerID)
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}
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if peer.state == peerStateRemoved {
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return fmt.Errorf("Tried to touch peer in peerStateRemoved")
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}
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peer.lastTouched = time
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return nil
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}
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func (sc *schedule) removePeer(peerID p2p.ID) error {
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("Couldn't find peer %s", peerID)
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}
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if peer.state == peerStateRemoved {
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return fmt.Errorf("Tried to remove peer %s in peerStateRemoved", peerID)
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}
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for height, pendingPeerID := range sc.pendingBlocks {
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if pendingPeerID == peerID {
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sc.setStateAtHeight(height, blockStateNew)
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delete(sc.pendingTime, height)
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delete(sc.pendingBlocks, height)
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}
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}
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for height, rcvPeerID := range sc.receivedBlocks {
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if rcvPeerID == peerID {
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sc.setStateAtHeight(height, blockStateNew)
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delete(sc.receivedBlocks, height)
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}
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}
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peer.state = peerStateRemoved
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return nil
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}
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func (sc *schedule) setPeerHeight(peerID p2p.ID, height int64) error {
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("Can't find peer %s", peerID)
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}
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if peer.state == peerStateRemoved {
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return fmt.Errorf("Cannot set peer height for a peer in peerStateRemoved")
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}
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if height < peer.height {
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return fmt.Errorf("Cannot move peer height lower. from %d to %d", peer.height, height)
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}
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peer.height = height
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peer.state = peerStateReady
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for i := sc.minHeight(); i <= height; i++ {
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if sc.getStateAtHeight(i) == blockStateUnknown {
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sc.setStateAtHeight(i, blockStateNew)
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}
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}
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return nil
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}
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func (sc *schedule) getStateAtHeight(height int64) blockState {
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if height < sc.initHeight {
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return blockStateProcessed
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} else if state, ok := sc.blockStates[height]; ok {
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return state
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} else {
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return blockStateUnknown
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}
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}
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func (sc *schedule) getPeersAtHeight(height int64) []*scPeer {
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peers := []*scPeer{}
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for _, peer := range sc.peers {
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if peer.height >= height {
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peers = append(peers, peer)
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}
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}
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return peers
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}
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func (sc *schedule) peersInactiveSince(duration time.Duration, now time.Time) []p2p.ID {
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peers := []p2p.ID{}
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for _, peer := range sc.peers {
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if now.Sub(peer.lastTouched) > duration {
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peers = append(peers, peer.peerID)
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}
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}
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return peers
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}
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func (sc *schedule) peersSlowerThan(minSpeed int64) []p2p.ID {
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peers := []p2p.ID{}
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for _, peer := range sc.peers {
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if peer.lastRate < minSpeed {
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peers = append(peers, peer.peerID)
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}
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}
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return peers
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}
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func (sc *schedule) setStateAtHeight(height int64, state blockState) {
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sc.blockStates[height] = state
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}
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func (sc *schedule) markReceived(peerID p2p.ID, height int64, size int64, now time.Time) error {
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("Can't find peer %s", peerID)
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}
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if peer.state == peerStateRemoved {
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return fmt.Errorf("Cannot receive blocks from removed peer %s", peerID)
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}
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if state := sc.getStateAtHeight(height); state != blockStatePending || sc.pendingBlocks[height] != peerID {
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return fmt.Errorf("Received block %d from peer %s without being requested", height, peerID)
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}
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pendingTime, ok := sc.pendingTime[height]
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if !ok || now.Sub(pendingTime) <= 0 {
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return fmt.Errorf("Clock error. Block %d received at %s but requested at %s",
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height, pendingTime, now)
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}
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peer.lastRate = size / int64(now.Sub(pendingTime).Seconds())
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sc.setStateAtHeight(height, blockStateReceived)
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delete(sc.pendingBlocks, height)
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delete(sc.pendingTime, height)
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sc.receivedBlocks[height] = peerID
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return nil
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}
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func (sc *schedule) markPending(peerID p2p.ID, height int64, time time.Time) error {
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("Can't find peer %s", peerID)
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}
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state := sc.getStateAtHeight(height)
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if state != blockStateNew {
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return fmt.Errorf("Block %d should be in blockStateNew but was %s", height, state)
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}
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if peer.state != peerStateReady {
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return fmt.Errorf("Cannot schedule %d from %s in %s", height, peerID, peer.state)
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}
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if height > peer.height {
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return fmt.Errorf("Cannot request height %d from peer %s who is at height %d",
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height, peerID, peer.height)
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}
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sc.setStateAtHeight(height, blockStatePending)
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sc.pendingBlocks[height] = peerID
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// XXX: to make this more accurate we can introduce a message from
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// the IO routine which indicates the time the request was put on the wire
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sc.pendingTime[height] = time
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return nil
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}
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func (sc *schedule) markProcessed(height int64) error {
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state := sc.getStateAtHeight(height)
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if state != blockStateReceived {
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return fmt.Errorf("Can't mark height %d received from block state %s", height, state)
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}
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delete(sc.receivedBlocks, height)
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sc.setStateAtHeight(height, blockStateProcessed)
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return nil
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}
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// allBlockProcessed returns true if all blocks are in blockStateProcessed and
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// determines if the schedule has been completed
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func (sc *schedule) allBlocksProcessed() bool {
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for _, state := range sc.blockStates {
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if state != blockStateProcessed {
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return false
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}
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}
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return true
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}
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// highest block | state == blockStateNew
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func (sc *schedule) maxHeight() int64 {
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var max int64 = 0
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for height, state := range sc.blockStates {
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if state == blockStateNew && height > max {
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max = height
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}
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}
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return max
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}
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// lowest block | state == blockStateNew
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func (sc *schedule) minHeight() int64 {
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var min int64 = math.MaxInt64
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for height, state := range sc.blockStates {
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if state == blockStateNew && height < min {
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min = height
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}
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}
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return min
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}
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func (sc *schedule) pendingFrom(peerID p2p.ID) []int64 {
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heights := []int64{}
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for height, pendingPeerID := range sc.pendingBlocks {
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if pendingPeerID == peerID {
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heights = append(heights, height)
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}
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}
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return heights
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}
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func (sc *schedule) selectPeer(peers []*scPeer) *scPeer {
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// FIXME: properPeerSelector
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s := rand.NewSource(time.Now().Unix())
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r := rand.New(s)
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return peers[r.Intn(len(peers))]
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}
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// XXX: this duplicates the logic of peersInactiveSince and peersSlowerThan
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func (sc *schedule) prunablePeers(peerTimout time.Duration, minRecvRate int64, now time.Time) []p2p.ID {
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prunable := []p2p.ID{}
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for peerID, peer := range sc.peers {
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if now.Sub(peer.lastTouched) > peerTimout || peer.lastRate < minRecvRate {
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prunable = append(prunable, peerID)
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}
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}
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return prunable
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}
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func (sc *schedule) numBlockInState(targetState blockState) uint32 {
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var num uint32 = 0
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for _, state := range sc.blockStates {
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if state == targetState {
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num++
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}
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}
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return num
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}
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