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424 lines
14 KiB
424 lines
14 KiB
package statesync
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"strings"
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"sync"
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"time"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/internal/p2p"
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sm "github.com/tendermint/tendermint/internal/state"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/light"
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lightprovider "github.com/tendermint/tendermint/light/provider"
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lighthttp "github.com/tendermint/tendermint/light/provider/http"
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lightrpc "github.com/tendermint/tendermint/light/rpc"
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lightdb "github.com/tendermint/tendermint/light/store/db"
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ssproto "github.com/tendermint/tendermint/proto/tendermint/statesync"
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rpchttp "github.com/tendermint/tendermint/rpc/client/http"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/version"
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)
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//go:generate ../../scripts/mockery_generate.sh StateProvider
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// StateProvider is a provider of trusted state data for bootstrapping a node. This refers
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// to the state.State object, not the state machine. There are two implementations. One
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// uses the P2P layer and the other uses the RPC layer. Both use light client verification.
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type StateProvider interface {
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// AppHash returns the app hash after the given height has been committed.
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AppHash(ctx context.Context, height uint64) ([]byte, error)
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// Commit returns the commit at the given height.
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Commit(ctx context.Context, height uint64) (*types.Commit, error)
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// State returns a state object at the given height.
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State(ctx context.Context, height uint64) (sm.State, error)
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}
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type stateProviderRPC struct {
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sync.Mutex // light.Client is not concurrency-safe
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lc *light.Client
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initialHeight int64
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providers map[lightprovider.Provider]string
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logger log.Logger
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}
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// NewRPCStateProvider creates a new StateProvider using a light client and RPC clients.
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func NewRPCStateProvider(
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ctx context.Context,
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chainID string,
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initialHeight int64,
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servers []string,
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trustOptions light.TrustOptions,
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logger log.Logger,
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) (StateProvider, error) {
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if len(servers) < 2 {
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return nil, fmt.Errorf("at least 2 RPC servers are required, got %d", len(servers))
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}
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providers := make([]lightprovider.Provider, 0, len(servers))
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providerRemotes := make(map[lightprovider.Provider]string)
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for _, server := range servers {
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client, err := rpcClient(server)
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if err != nil {
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return nil, fmt.Errorf("failed to set up RPC client: %w", err)
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}
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provider := lighthttp.NewWithClient(chainID, client)
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providers = append(providers, provider)
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// We store the RPC addresses keyed by provider, so we can find the address of the primary
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// provider used by the light client and use it to fetch consensus parameters.
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providerRemotes[provider] = server
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}
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lc, err := light.NewClient(ctx, chainID, trustOptions, providers[0], providers[1:],
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lightdb.New(dbm.NewMemDB()), light.Logger(logger))
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if err != nil {
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return nil, err
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}
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return &stateProviderRPC{
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logger: logger,
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lc: lc,
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initialHeight: initialHeight,
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providers: providerRemotes,
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}, nil
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}
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func (s *stateProviderRPC) verifyLightBlockAtHeight(ctx context.Context, height uint64, ts time.Time) (*types.LightBlock, error) {
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ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
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defer cancel()
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return s.lc.VerifyLightBlockAtHeight(ctx, int64(height), ts)
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}
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// AppHash implements part of StateProvider. It calls the application to verify the
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// light blocks at heights h+1 and h+2 and, if verification succeeds, reports the app
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// hash for the block at height h+1 which correlates to the state at height h.
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func (s *stateProviderRPC) AppHash(ctx context.Context, height uint64) ([]byte, error) {
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s.Lock()
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defer s.Unlock()
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// We have to fetch the next height, which contains the app hash for the previous height.
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header, err := s.verifyLightBlockAtHeight(ctx, height+1, time.Now())
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if err != nil {
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return nil, err
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}
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// We also try to fetch the blocks at H+2, since we need these
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// when building the state while restoring the snapshot. This avoids the race
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// condition where we try to restore a snapshot before H+2 exists.
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_, err = s.verifyLightBlockAtHeight(ctx, height+2, time.Now())
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if err != nil {
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return nil, err
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}
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return header.AppHash, nil
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}
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// Commit implements StateProvider.
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func (s *stateProviderRPC) Commit(ctx context.Context, height uint64) (*types.Commit, error) {
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s.Lock()
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defer s.Unlock()
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header, err := s.verifyLightBlockAtHeight(ctx, height, time.Now())
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if err != nil {
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return nil, err
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}
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return header.Commit, nil
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}
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// State implements StateProvider.
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func (s *stateProviderRPC) State(ctx context.Context, height uint64) (sm.State, error) {
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s.Lock()
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defer s.Unlock()
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state := sm.State{
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ChainID: s.lc.ChainID(),
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InitialHeight: s.initialHeight,
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}
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if state.InitialHeight == 0 {
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state.InitialHeight = 1
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}
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// The snapshot height maps onto the state heights as follows:
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//
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// height: last block, i.e. the snapshotted height
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// height+1: current block, i.e. the first block we'll process after the snapshot
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// height+2: next block, i.e. the second block after the snapshot
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//
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// We need to fetch the NextValidators from height+2 because if the application changed
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// the validator set at the snapshot height then this only takes effect at height+2.
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lastLightBlock, err := s.verifyLightBlockAtHeight(ctx, height, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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currentLightBlock, err := s.verifyLightBlockAtHeight(ctx, height+1, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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nextLightBlock, err := s.verifyLightBlockAtHeight(ctx, height+2, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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state.Version = sm.Version{
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Consensus: currentLightBlock.Version,
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Software: version.TMVersion,
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}
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state.LastBlockHeight = lastLightBlock.Height
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state.LastBlockTime = lastLightBlock.Time
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state.LastBlockID = lastLightBlock.Commit.BlockID
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state.AppHash = currentLightBlock.AppHash
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state.LastResultsHash = currentLightBlock.LastResultsHash
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state.LastValidators = lastLightBlock.ValidatorSet
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state.Validators = currentLightBlock.ValidatorSet
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state.NextValidators = nextLightBlock.ValidatorSet
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state.LastHeightValidatorsChanged = nextLightBlock.Height
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// We'll also need to fetch consensus params via RPC, using light client verification.
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primaryURL, ok := s.providers[s.lc.Primary()]
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if !ok || primaryURL == "" {
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return sm.State{}, fmt.Errorf("could not find address for primary light client provider")
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}
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primaryRPC, err := rpcClient(primaryURL)
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if err != nil {
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return sm.State{}, fmt.Errorf("unable to create RPC client: %w", err)
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}
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rpcclient := lightrpc.NewClient(s.logger, primaryRPC, s.lc)
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result, err := rpcclient.ConsensusParams(ctx, ¤tLightBlock.Height)
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if err != nil {
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return sm.State{}, fmt.Errorf("unable to fetch consensus parameters for height %v: %w",
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nextLightBlock.Height, err)
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}
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state.ConsensusParams = result.ConsensusParams
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state.LastHeightConsensusParamsChanged = currentLightBlock.Height
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return state, nil
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}
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// rpcClient sets up a new RPC client
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func rpcClient(server string) (*rpchttp.HTTP, error) {
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if !strings.Contains(server, "://") {
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server = "http://" + server
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}
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return rpchttp.New(server)
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}
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type stateProviderP2P struct {
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sync.Mutex // light.Client is not concurrency-safe
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lc *light.Client
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initialHeight int64
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paramsSendCh *p2p.Channel
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paramsRecvCh chan types.ConsensusParams
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}
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// NewP2PStateProvider creates a light client state
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// provider but uses a dispatcher connected to the P2P layer
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func NewP2PStateProvider(
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ctx context.Context,
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chainID string,
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initialHeight int64,
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providers []lightprovider.Provider,
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trustOptions light.TrustOptions,
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paramsSendCh *p2p.Channel,
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logger log.Logger,
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) (StateProvider, error) {
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if len(providers) < 2 {
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return nil, fmt.Errorf("at least 2 peers are required, got %d", len(providers))
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}
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lc, err := light.NewClient(ctx, chainID, trustOptions, providers[0], providers[1:],
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lightdb.New(dbm.NewMemDB()), light.Logger(logger))
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if err != nil {
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return nil, err
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}
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return &stateProviderP2P{
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lc: lc,
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initialHeight: initialHeight,
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paramsSendCh: paramsSendCh,
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paramsRecvCh: make(chan types.ConsensusParams),
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}, nil
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}
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func (s *stateProviderP2P) verifyLightBlockAtHeight(ctx context.Context, height uint64, ts time.Time) (*types.LightBlock, error) {
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ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
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defer cancel()
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return s.lc.VerifyLightBlockAtHeight(ctx, int64(height), ts)
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}
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// AppHash implements StateProvider.
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func (s *stateProviderP2P) AppHash(ctx context.Context, height uint64) ([]byte, error) {
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s.Lock()
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defer s.Unlock()
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// We have to fetch the next height, which contains the app hash for the previous height.
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header, err := s.verifyLightBlockAtHeight(ctx, height+1, time.Now())
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if err != nil {
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return nil, err
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}
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// We also try to fetch the blocks at H+2, since we need these
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// when building the state while restoring the snapshot. This avoids the race
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// condition where we try to restore a snapshot before H+2 exists.
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_, err = s.verifyLightBlockAtHeight(ctx, height+2, time.Now())
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if err != nil {
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return nil, err
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}
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return header.AppHash, nil
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}
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// Commit implements StateProvider.
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func (s *stateProviderP2P) Commit(ctx context.Context, height uint64) (*types.Commit, error) {
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s.Lock()
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defer s.Unlock()
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header, err := s.verifyLightBlockAtHeight(ctx, height, time.Now())
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if err != nil {
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return nil, err
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}
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return header.Commit, nil
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}
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// State implements StateProvider.
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func (s *stateProviderP2P) State(ctx context.Context, height uint64) (sm.State, error) {
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s.Lock()
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defer s.Unlock()
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state := sm.State{
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ChainID: s.lc.ChainID(),
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InitialHeight: s.initialHeight,
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}
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if state.InitialHeight == 0 {
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state.InitialHeight = 1
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}
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// The snapshot height maps onto the state heights as follows:
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//
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// height: last block, i.e. the snapshotted height
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// height+1: current block, i.e. the first block we'll process after the snapshot
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// height+2: next block, i.e. the second block after the snapshot
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//
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// We need to fetch the NextValidators from height+2 because if the application changed
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// the validator set at the snapshot height then this only takes effect at height+2.
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lastLightBlock, err := s.verifyLightBlockAtHeight(ctx, height, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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currentLightBlock, err := s.verifyLightBlockAtHeight(ctx, height+1, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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nextLightBlock, err := s.verifyLightBlockAtHeight(ctx, height+2, time.Now())
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if err != nil {
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return sm.State{}, err
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}
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state.Version = sm.Version{
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Consensus: currentLightBlock.Version,
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Software: version.TMVersion,
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}
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state.LastBlockHeight = lastLightBlock.Height
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state.LastBlockTime = lastLightBlock.Time
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state.LastBlockID = lastLightBlock.Commit.BlockID
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state.AppHash = currentLightBlock.AppHash
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state.LastResultsHash = currentLightBlock.LastResultsHash
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state.LastValidators = lastLightBlock.ValidatorSet
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state.Validators = currentLightBlock.ValidatorSet
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state.NextValidators = nextLightBlock.ValidatorSet
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state.LastHeightValidatorsChanged = nextLightBlock.Height
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// We'll also need to fetch consensus params via P2P.
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state.ConsensusParams, err = s.consensusParams(ctx, currentLightBlock.Height)
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if err != nil {
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return sm.State{}, err
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}
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// validate the consensus params
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if !bytes.Equal(nextLightBlock.ConsensusHash, state.ConsensusParams.HashConsensusParams()) {
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return sm.State{}, fmt.Errorf("consensus params hash mismatch at height %d. Expected %v, got %v",
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currentLightBlock.Height, nextLightBlock.ConsensusHash, state.ConsensusParams.HashConsensusParams())
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}
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// set the last height changed to the current height
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state.LastHeightConsensusParamsChanged = currentLightBlock.Height
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return state, nil
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}
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// addProvider dynamically adds a peer as a new witness. A limit of 6 providers is kept as a
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// heuristic. Too many overburdens the network and too little compromises the second layer of security.
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func (s *stateProviderP2P) addProvider(p lightprovider.Provider) {
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if len(s.lc.Witnesses()) < 6 {
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s.lc.AddProvider(p)
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}
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}
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// consensusParams sends out a request for consensus params blocking
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// until one is returned.
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//
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// If it fails to get a valid set of consensus params from any of the
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// providers it returns an error; however, it will retry indefinitely
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// (with backoff) until the context is canceled.
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func (s *stateProviderP2P) consensusParams(ctx context.Context, height int64) (types.ConsensusParams, error) {
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iterCount := 0
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for {
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params, err := s.tryGetConsensusParamsFromWitnesses(ctx, height)
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if err != nil {
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return types.ConsensusParams{}, err
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}
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if params != nil {
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return *params, nil
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}
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iterCount++
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select {
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case <-ctx.Done():
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return types.ConsensusParams{}, ctx.Err()
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case <-time.After(time.Duration(iterCount) * consensusParamsResponseTimeout):
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}
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}
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}
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// tryGetConsensusParamsFromWitnesses attempts to get consensus
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// parameters from the light clients available witnesses. If both
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// return parameters are nil, then it can be retried.
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func (s *stateProviderP2P) tryGetConsensusParamsFromWitnesses(
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ctx context.Context,
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height int64,
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) (*types.ConsensusParams, error) {
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for _, provider := range s.lc.Witnesses() {
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p, ok := provider.(*BlockProvider)
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if !ok {
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panic("expected p2p state provider to use p2p block providers")
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}
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// extract the nodeID of the provider
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peer, err := types.NewNodeID(p.String())
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if err != nil {
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return nil, fmt.Errorf("invalid provider (%s) node id: %w", p.String(), err)
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}
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if err := s.paramsSendCh.Send(ctx, p2p.Envelope{
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To: peer,
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Message: &ssproto.ParamsRequest{
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Height: uint64(height),
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},
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}); err != nil {
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return nil, err
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}
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select {
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// if we get no response from this provider we move on to the next one
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case <-time.After(consensusParamsResponseTimeout):
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continue
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case <-ctx.Done():
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return nil, ctx.Err()
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case params, ok := <-s.paramsRecvCh:
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if !ok {
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return nil, errors.New("params channel closed")
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}
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return ¶ms, nil
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}
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}
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// signal to caller to retry.
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return nil, nil
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}
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