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202 lines
6.9 KiB
202 lines
6.9 KiB
package statesync
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import (
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"context"
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"fmt"
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"strings"
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"time"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/libs/log"
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tmsync "github.com/tendermint/tendermint/libs/sync"
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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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rpchttp "github.com/tendermint/tendermint/rpc/client/http"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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//go:generate mockery --case underscore --name 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.
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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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// lightClientStateProvider is a state provider using the light client.
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type lightClientStateProvider struct {
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tmsync.Mutex // light.Client is not concurrency-safe
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lc *light.Client
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version sm.Version
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initialHeight int64
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providers map[lightprovider.Provider]string
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}
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// NewLightClientStateProvider creates a new StateProvider using a light client and RPC clients.
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func NewLightClientStateProvider(
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ctx context.Context,
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chainID string,
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version sm.Version,
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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 %v", 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 &lightClientStateProvider{
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lc: lc,
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version: version,
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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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// AppHash implements StateProvider.
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func (s *lightClientStateProvider) 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.lc.VerifyLightBlockAtHeight(ctx, int64(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 height H and 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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//
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// FIXME This is a hack, since we can't add new methods to the interface without
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// breaking it. We should instead have a Has(ctx, height) method which checks
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// that the state provider has access to the necessary data for the height.
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// We piggyback on AppHash() since it's called when adding snapshots to the pool.
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_, err = s.lc.VerifyLightBlockAtHeight(ctx, int64(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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_, err = s.lc.VerifyLightBlockAtHeight(ctx, int64(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.AppHash, nil
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}
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// Commit implements StateProvider.
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func (s *lightClientStateProvider) 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.lc.VerifyLightBlockAtHeight(ctx, int64(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 *lightClientStateProvider) 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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Version: s.version,
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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.lc.VerifyLightBlockAtHeight(ctx, int64(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.lc.VerifyLightBlockAtHeight(ctx, int64(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.lc.VerifyLightBlockAtHeight(ctx, int64(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.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(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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c, err := rpchttp.New(server, "/websocket")
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if err != nil {
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return nil, err
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}
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return c, nil
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}
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