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711 lines
20 KiB
711 lines
20 KiB
package v2
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import (
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"bytes"
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"errors"
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"fmt"
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"math"
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"sort"
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"time"
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"github.com/tendermint/tendermint/types"
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)
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// Events generated by the scheduler:
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// all blocks have been processed
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type scFinishedEv struct {
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priorityNormal
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reason string
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}
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func (e scFinishedEv) String() string {
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return fmt.Sprintf("scFinishedEv{%v}", e.reason)
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}
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// send a blockRequest message
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type scBlockRequest struct {
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priorityNormal
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peerID types.NodeID
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height int64
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}
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func (e scBlockRequest) String() string {
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return fmt.Sprintf("scBlockRequest{%d from %v}", e.height, e.peerID)
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}
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// a block has been received and validated by the scheduler
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type scBlockReceived struct {
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priorityNormal
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peerID types.NodeID
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block *types.Block
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}
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func (e scBlockReceived) String() string {
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return fmt.Sprintf("scBlockReceived{%d#%X from %v}", e.block.Height, e.block.Hash(), e.peerID)
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}
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// scheduler detected a peer error
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type scPeerError struct {
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priorityHigh
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peerID types.NodeID
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reason error
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}
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func (e scPeerError) String() string {
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return fmt.Sprintf("scPeerError{%v errored with %v}", e.peerID, e.reason)
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}
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// scheduler removed a set of peers (timed out or slow peer)
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type scPeersPruned struct {
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priorityHigh
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peers []types.NodeID
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}
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func (e scPeersPruned) String() string {
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return fmt.Sprintf("scPeersPruned{%v}", e.peers)
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}
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// XXX: make this fatal?
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// scheduler encountered a fatal error
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type scSchedulerFail struct {
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priorityHigh
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reason error
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}
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func (e scSchedulerFail) String() string {
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return fmt.Sprintf("scSchedulerFail{%v}", e.reason)
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}
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type blockState int
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const (
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blockStateUnknown blockState = iota + 1 // no known peer has this block
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blockStateNew // indicates that a peer has reported having this block
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blockStatePending // indicates that this block has been requested from a peer
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blockStateReceived // indicates that this block has been received by a peer
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blockStateProcessed // indicates that this block has been applied
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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("invalid 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 + 1
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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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panic(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 types.NodeID
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// initialized as New when peer is added, updated to Ready when statusUpdate is received,
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// updated to Removed when peer is removed
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state peerState
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base int64 // updated when statusResponse is received
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height int64 // updated when statusResponse is received
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lastTouched time.Time
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lastRate int64 // last receive rate in bytes
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}
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func (p scPeer) String() string {
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return fmt.Sprintf("{state %v, base %d, height %d, lastTouched %v, lastRate %d, id %v}",
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p.state, p.base, p.height, p.lastTouched, p.lastRate, p.peerID)
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}
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func newScPeer(peerID types.NodeID) *scPeer {
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return &scPeer{
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peerID: peerID,
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state: peerStateNew,
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base: -1,
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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 scheduler keep track of the state of each block and each peer. The
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// scheduler will attempt to schedule new block requests with `trySchedule`
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// events and remove slow peers with `tryPrune` events.
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type scheduler struct {
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initHeight int64
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// next block that needs to be processed. All blocks with smaller height are
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// in Processed state.
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height int64
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// lastAdvance tracks the last time a block execution happened.
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// syncTimeout is the maximum time the scheduler waits to advance in the block sync process before finishing.
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// This covers the cases where there are no peers or all peers have a lower height.
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lastAdvance time.Time
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syncTimeout time.Duration
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// a map of peerID to scheduler specific peer struct `scPeer` used to keep
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// track of peer specific state
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peers map[types.NodeID]*scPeer
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peerTimeout time.Duration // maximum response time from a peer otherwise prune
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minRecvRate int64 // minimum receive rate from peer otherwise prune
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// the maximum number of blocks that should be New, Received or Pending at any point
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// in time. This is used to enforce a limit on the blockStates map.
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targetPending int
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// a list of blocks to be scheduled (New), Pending or Received. Its length should be
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// smaller than targetPending.
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blockStates map[int64]blockState
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// a map of heights to the peer we are waiting a response from
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pendingBlocks map[int64]types.NodeID
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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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// a map of heights to the peers that put the block in blockStateReceived
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receivedBlocks map[int64]types.NodeID
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}
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func (sc scheduler) String() string {
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return fmt.Sprintf("ih: %d, bst: %v, peers: %v, pblks: %v, ptm %v, rblks: %v",
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sc.initHeight, sc.blockStates, sc.peers, sc.pendingBlocks, sc.pendingTime, sc.receivedBlocks)
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}
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func newScheduler(initHeight int64, startTime time.Time) *scheduler {
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sc := scheduler{
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initHeight: initHeight,
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lastAdvance: startTime,
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syncTimeout: 60 * time.Second,
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height: initHeight,
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blockStates: make(map[int64]blockState),
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peers: make(map[types.NodeID]*scPeer),
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pendingBlocks: make(map[int64]types.NodeID),
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pendingTime: make(map[int64]time.Time),
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receivedBlocks: make(map[int64]types.NodeID),
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targetPending: 10, // TODO - pass as param
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peerTimeout: 15 * time.Second, // TODO - pass as param
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minRecvRate: 0, // int64(7680), TODO - pass as param
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}
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return &sc
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}
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func (sc *scheduler) ensurePeer(peerID types.NodeID) *scPeer {
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if _, ok := sc.peers[peerID]; !ok {
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sc.peers[peerID] = newScPeer(peerID)
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}
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return sc.peers[peerID]
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}
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func (sc *scheduler) touchPeer(peerID types.NodeID, 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 != peerStateReady {
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return fmt.Errorf("tried to touch peer in state %s, must be Ready", peer.state)
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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 *scheduler) removePeer(peerID types.NodeID) {
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peer, ok := sc.peers[peerID]
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if !ok {
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return
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}
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if peer.state == peerStateRemoved {
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return
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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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// remove the blocks from blockStates if the peer removal causes the max peer height to be lower.
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peer.state = peerStateRemoved
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maxPeerHeight := int64(0)
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for _, otherPeer := range sc.peers {
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if otherPeer.state != peerStateReady {
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continue
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}
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if otherPeer.peerID != peer.peerID && otherPeer.height > maxPeerHeight {
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maxPeerHeight = otherPeer.height
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}
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}
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for h := range sc.blockStates {
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if h > maxPeerHeight {
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delete(sc.blockStates, h)
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}
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}
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}
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// check if the blockPool is running low and add new blocks in New state to be requested.
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// This function is called when there is an increase in the maximum peer height or when
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// blocks are processed.
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func (sc *scheduler) addNewBlocks() {
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if len(sc.blockStates) >= sc.targetPending {
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return
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}
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for i := sc.height; i < int64(sc.targetPending)+sc.height; i++ {
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if i > sc.maxHeight() {
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break
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}
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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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}
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func (sc *scheduler) setPeerRange(peerID types.NodeID, base int64, height int64) error {
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peer := sc.ensurePeer(peerID)
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if peer.state == peerStateRemoved {
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return nil // noop
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}
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if height < peer.height {
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sc.removePeer(peerID)
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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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if base > height {
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sc.removePeer(peerID)
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return fmt.Errorf("cannot set peer base higher than its height")
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}
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peer.base = base
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peer.height = height
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peer.state = peerStateReady
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sc.addNewBlocks()
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return nil
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}
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func (sc *scheduler) getStateAtHeight(height int64) blockState {
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if height < sc.height {
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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 *scheduler) getPeersWithHeight(height int64) []types.NodeID {
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peers := make([]types.NodeID, 0)
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for _, peer := range sc.peers {
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if peer.state != peerStateReady {
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continue
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}
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if peer.base <= height && peer.height >= height {
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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 *scheduler) prunablePeers(peerTimout time.Duration, minRecvRate int64, now time.Time) []types.NodeID {
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prunable := make([]types.NodeID, 0)
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for peerID, peer := range sc.peers {
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if peer.state != peerStateReady {
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continue
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}
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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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// Tests for handleTryPrunePeer() may fail without sort due to range non-determinism
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sort.Sort(PeerByID(prunable))
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return prunable
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}
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func (sc *scheduler) setStateAtHeight(height int64, state blockState) {
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sc.blockStates[height] = state
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}
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// CONTRACT: peer exists and in Ready state.
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func (sc *scheduler) markReceived(peerID types.NodeID, height int64, size int64, now time.Time) error {
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peer := sc.peers[peerID]
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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 / now.Sub(pendingTime).Nanoseconds()
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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 *scheduler) markPending(peerID types.NodeID, height int64, time time.Time) error {
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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 is %s", height, state)
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}
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peer, ok := sc.peers[peerID]
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if !ok {
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return fmt.Errorf("cannot find peer %s", peerID)
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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 that is at height %d",
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height, peerID, peer.height)
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}
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if height < peer.base {
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return fmt.Errorf("cannot request height %d for peer %s with base %d",
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height, peerID, peer.base)
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}
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sc.setStateAtHeight(height, blockStatePending)
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sc.pendingBlocks[height] = peerID
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sc.pendingTime[height] = time
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return nil
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}
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func (sc *scheduler) markProcessed(height int64) error {
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// It is possible that a peer error or timeout is handled after the processor
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// has processed the block but before the scheduler received this event, so
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// when pcBlockProcessed event is received, the block had been requested
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// again => don't check the block state.
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sc.lastAdvance = time.Now()
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sc.height = height + 1
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delete(sc.pendingBlocks, height)
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delete(sc.pendingTime, height)
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delete(sc.receivedBlocks, height)
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delete(sc.blockStates, height)
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sc.addNewBlocks()
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return nil
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}
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func (sc *scheduler) allBlocksProcessed() bool {
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if len(sc.peers) == 0 {
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return false
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}
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return sc.height >= sc.maxHeight()
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}
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// returns max peer height or the last processed block, i.e. sc.height
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func (sc *scheduler) maxHeight() int64 {
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max := sc.height - 1
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for _, peer := range sc.peers {
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if peer.state != peerStateReady {
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continue
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}
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if max < peer.height {
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max = peer.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 in sc.blockStates with state == blockStateNew or -1 if no new blocks
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func (sc *scheduler) nextHeightToSchedule() 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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if min == math.MaxInt64 {
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min = -1
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}
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return min
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}
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func (sc *scheduler) pendingFrom(peerID types.NodeID) []int64 {
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var 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 *scheduler) selectPeer(height int64) (types.NodeID, error) {
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peers := sc.getPeersWithHeight(height)
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if len(peers) == 0 {
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return "", fmt.Errorf("cannot find peer for height %d", height)
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}
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// create a map from number of pending requests to a list
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// of peers having that number of pending requests.
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pendingFrom := make(map[int][]types.NodeID)
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for _, peerID := range peers {
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numPending := len(sc.pendingFrom(peerID))
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pendingFrom[numPending] = append(pendingFrom[numPending], peerID)
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}
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// find the set of peers with minimum number of pending requests.
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var minPending int64 = math.MaxInt64
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for mp := range pendingFrom {
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if int64(mp) < minPending {
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minPending = int64(mp)
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}
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}
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sort.Sort(PeerByID(pendingFrom[int(minPending)]))
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return pendingFrom[int(minPending)][0], nil
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}
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// PeerByID is a list of peers sorted by peerID.
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type PeerByID []types.NodeID
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func (peers PeerByID) Len() int {
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return len(peers)
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}
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func (peers PeerByID) Less(i, j int) bool {
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return bytes.Compare([]byte(peers[i]), []byte(peers[j])) == -1
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}
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func (peers PeerByID) Swap(i, j int) {
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peers[i], peers[j] = peers[j], peers[i]
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}
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// Handlers
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// This handler gets the block, performs some validation and then passes it on to the processor.
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func (sc *scheduler) handleBlockResponse(event bcBlockResponse) (Event, error) {
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err := sc.touchPeer(event.peerID, event.time)
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if err != nil {
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// peer does not exist OR not ready
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return noOp, nil
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}
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err = sc.markReceived(event.peerID, event.block.Height, event.size, event.time)
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if err != nil {
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sc.removePeer(event.peerID)
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return scPeerError{peerID: event.peerID, reason: err}, nil
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}
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return scBlockReceived{peerID: event.peerID, block: event.block}, nil
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}
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func (sc *scheduler) handleNoBlockResponse(event bcNoBlockResponse) (Event, error) {
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// No such peer or peer was removed.
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peer, ok := sc.peers[event.peerID]
|
|
if !ok || peer.state == peerStateRemoved {
|
|
return noOp, nil
|
|
}
|
|
|
|
// The peer may have been just removed due to errors, low speed or timeouts.
|
|
sc.removePeer(event.peerID)
|
|
|
|
return scPeerError{peerID: event.peerID,
|
|
reason: fmt.Errorf("peer %v with base %d height %d claims no block for %d",
|
|
event.peerID, peer.base, peer.height, event.height)}, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleBlockProcessed(event pcBlockProcessed) (Event, error) {
|
|
if event.height != sc.height {
|
|
panic(fmt.Sprintf("processed height %d, but expected height %d", event.height, sc.height))
|
|
}
|
|
|
|
err := sc.markProcessed(event.height)
|
|
if err != nil {
|
|
return scSchedulerFail{reason: err}, nil
|
|
}
|
|
|
|
if sc.allBlocksProcessed() {
|
|
return scFinishedEv{reason: "processed all blocks"}, nil
|
|
}
|
|
|
|
return noOp, nil
|
|
}
|
|
|
|
// Handles an error from the processor. The processor had already cleaned the blocks from
|
|
// the peers included in this event. Just attempt to remove the peers.
|
|
func (sc *scheduler) handleBlockProcessError(event pcBlockVerificationFailure) (Event, error) {
|
|
// The peers may have been just removed due to errors, low speed or timeouts.
|
|
sc.removePeer(event.firstPeerID)
|
|
if event.firstPeerID != event.secondPeerID {
|
|
sc.removePeer(event.secondPeerID)
|
|
}
|
|
|
|
if sc.allBlocksProcessed() {
|
|
return scFinishedEv{reason: "error on last block"}, nil
|
|
}
|
|
|
|
return noOp, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleAddNewPeer(event bcAddNewPeer) (Event, error) {
|
|
sc.ensurePeer(event.peerID)
|
|
return noOp, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleRemovePeer(event bcRemovePeer) (Event, error) {
|
|
sc.removePeer(event.peerID)
|
|
|
|
if sc.allBlocksProcessed() {
|
|
return scFinishedEv{reason: "removed peer"}, nil
|
|
}
|
|
|
|
// Return scPeerError so the peer (and all associated blocks) is removed from
|
|
// the processor.
|
|
return scPeerError{peerID: event.peerID, reason: errors.New("peer was stopped")}, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleTryPrunePeer(event rTryPrunePeer) (Event, error) {
|
|
// Check behavior of peer responsible to deliver block at sc.height.
|
|
timeHeightAsked, ok := sc.pendingTime[sc.height]
|
|
if ok && time.Since(timeHeightAsked) > sc.peerTimeout {
|
|
// A request was sent to a peer for block at sc.height but a response was not received
|
|
// from that peer within sc.peerTimeout. Remove the peer. This is to ensure that a peer
|
|
// will be timed out even if it sends blocks at higher heights but prevents progress by
|
|
// not sending the block at current height.
|
|
sc.removePeer(sc.pendingBlocks[sc.height])
|
|
}
|
|
|
|
prunablePeers := sc.prunablePeers(sc.peerTimeout, sc.minRecvRate, event.time)
|
|
if len(prunablePeers) == 0 {
|
|
return noOp, nil
|
|
}
|
|
for _, peerID := range prunablePeers {
|
|
sc.removePeer(peerID)
|
|
}
|
|
|
|
// If all blocks are processed we should finish.
|
|
if sc.allBlocksProcessed() {
|
|
return scFinishedEv{reason: "after try prune"}, nil
|
|
}
|
|
|
|
return scPeersPruned{peers: prunablePeers}, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleResetState(event bcResetState) (Event, error) {
|
|
initHeight := event.state.LastBlockHeight + 1
|
|
if initHeight == 1 {
|
|
initHeight = event.state.InitialHeight
|
|
}
|
|
sc.initHeight = initHeight
|
|
sc.height = initHeight
|
|
sc.lastAdvance = time.Now()
|
|
sc.addNewBlocks()
|
|
return noOp, nil
|
|
}
|
|
|
|
func (sc *scheduler) handleTrySchedule(event rTrySchedule) (Event, error) {
|
|
if time.Since(sc.lastAdvance) > sc.syncTimeout {
|
|
return scFinishedEv{reason: "timeout, no advance"}, nil
|
|
}
|
|
|
|
nextHeight := sc.nextHeightToSchedule()
|
|
if nextHeight == -1 {
|
|
return noOp, nil
|
|
}
|
|
|
|
bestPeerID, err := sc.selectPeer(nextHeight)
|
|
if err != nil {
|
|
return scSchedulerFail{reason: err}, nil
|
|
}
|
|
if err := sc.markPending(bestPeerID, nextHeight, event.time); err != nil {
|
|
return scSchedulerFail{reason: err}, nil // XXX: peerError might be more appropriate
|
|
}
|
|
return scBlockRequest{peerID: bestPeerID, height: nextHeight}, nil
|
|
|
|
}
|
|
|
|
func (sc *scheduler) handleStatusResponse(event bcStatusResponse) (Event, error) {
|
|
err := sc.setPeerRange(event.peerID, event.base, event.height)
|
|
if err != nil {
|
|
return scPeerError{peerID: event.peerID, reason: err}, nil
|
|
}
|
|
return noOp, nil
|
|
}
|
|
|
|
func (sc *scheduler) handle(event Event) (Event, error) {
|
|
switch event := event.(type) {
|
|
case bcResetState:
|
|
nextEvent, err := sc.handleResetState(event)
|
|
return nextEvent, err
|
|
case bcStatusResponse:
|
|
nextEvent, err := sc.handleStatusResponse(event)
|
|
return nextEvent, err
|
|
case bcBlockResponse:
|
|
nextEvent, err := sc.handleBlockResponse(event)
|
|
return nextEvent, err
|
|
case bcNoBlockResponse:
|
|
nextEvent, err := sc.handleNoBlockResponse(event)
|
|
return nextEvent, err
|
|
case rTrySchedule:
|
|
nextEvent, err := sc.handleTrySchedule(event)
|
|
return nextEvent, err
|
|
case bcAddNewPeer:
|
|
nextEvent, err := sc.handleAddNewPeer(event)
|
|
return nextEvent, err
|
|
case bcRemovePeer:
|
|
nextEvent, err := sc.handleRemovePeer(event)
|
|
return nextEvent, err
|
|
case rTryPrunePeer:
|
|
nextEvent, err := sc.handleTryPrunePeer(event)
|
|
return nextEvent, err
|
|
case pcBlockProcessed:
|
|
nextEvent, err := sc.handleBlockProcessed(event)
|
|
return nextEvent, err
|
|
case pcBlockVerificationFailure:
|
|
nextEvent, err := sc.handleBlockProcessError(event)
|
|
return nextEvent, err
|
|
default:
|
|
return scSchedulerFail{reason: fmt.Errorf("unknown event %v", event)}, nil
|
|
}
|
|
}
|