You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
186 lines
6.2 KiB
186 lines
6.2 KiB
package statesync
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"strings"
|
|
"time"
|
|
|
|
dbm "github.com/tendermint/tm-db"
|
|
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
tmsync "github.com/tendermint/tendermint/libs/sync"
|
|
"github.com/tendermint/tendermint/light"
|
|
lightprovider "github.com/tendermint/tendermint/light/provider"
|
|
lighthttp "github.com/tendermint/tendermint/light/provider/http"
|
|
lightrpc "github.com/tendermint/tendermint/light/rpc"
|
|
lightdb "github.com/tendermint/tendermint/light/store/db"
|
|
tmstate "github.com/tendermint/tendermint/proto/tendermint/state"
|
|
rpchttp "github.com/tendermint/tendermint/rpc/client/http"
|
|
sm "github.com/tendermint/tendermint/state"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
//go:generate mockery --case underscore --name StateProvider
|
|
|
|
// StateProvider is a provider of trusted state data for bootstrapping a node. This refers
|
|
// to the state.State object, not the state machine.
|
|
type StateProvider interface {
|
|
// AppHash returns the app hash after the given height has been committed.
|
|
AppHash(ctx context.Context, height uint64) ([]byte, error)
|
|
// Commit returns the commit at the given height.
|
|
Commit(ctx context.Context, height uint64) (*types.Commit, error)
|
|
// State returns a state object at the given height.
|
|
State(ctx context.Context, height uint64) (sm.State, error)
|
|
}
|
|
|
|
// lightClientStateProvider is a state provider using the light client.
|
|
type lightClientStateProvider struct {
|
|
tmsync.Mutex // light.Client is not concurrency-safe
|
|
lc *light.Client
|
|
version tmstate.Version
|
|
initialHeight int64
|
|
providers map[lightprovider.Provider]string
|
|
}
|
|
|
|
// NewLightClientStateProvider creates a new StateProvider using a light client and RPC clients.
|
|
func NewLightClientStateProvider(
|
|
ctx context.Context,
|
|
chainID string,
|
|
version tmstate.Version,
|
|
initialHeight int64,
|
|
servers []string,
|
|
trustOptions light.TrustOptions,
|
|
logger log.Logger,
|
|
) (StateProvider, error) {
|
|
if len(servers) < 2 {
|
|
return nil, fmt.Errorf("at least 2 RPC servers are required, got %v", len(servers))
|
|
}
|
|
|
|
providers := make([]lightprovider.Provider, 0, len(servers))
|
|
providerRemotes := make(map[lightprovider.Provider]string)
|
|
for _, server := range servers {
|
|
client, err := rpcClient(server)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to set up RPC client: %w", err)
|
|
}
|
|
provider := lighthttp.NewWithClient(chainID, client)
|
|
providers = append(providers, provider)
|
|
// We store the RPC addresses keyed by provider, so we can find the address of the primary
|
|
// provider used by the light client and use it to fetch consensus parameters.
|
|
providerRemotes[provider] = server
|
|
}
|
|
|
|
lc, err := light.NewClient(ctx, chainID, trustOptions, providers[0], providers[1:],
|
|
lightdb.New(dbm.NewMemDB(), ""), light.Logger(logger), light.MaxRetryAttempts(5))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &lightClientStateProvider{
|
|
lc: lc,
|
|
version: version,
|
|
initialHeight: initialHeight,
|
|
providers: providerRemotes,
|
|
}, nil
|
|
}
|
|
|
|
// AppHash implements StateProvider.
|
|
func (s *lightClientStateProvider) AppHash(ctx context.Context, height uint64) ([]byte, error) {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
// We have to fetch the next height, which contains the app hash for the previous height.
|
|
header, err := s.lc.VerifyLightBlockAtHeight(ctx, int64(height+1), time.Now())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return header.AppHash, nil
|
|
}
|
|
|
|
// Commit implements StateProvider.
|
|
func (s *lightClientStateProvider) Commit(ctx context.Context, height uint64) (*types.Commit, error) {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
header, err := s.lc.VerifyLightBlockAtHeight(ctx, int64(height), time.Now())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return header.Commit, nil
|
|
}
|
|
|
|
// State implements StateProvider.
|
|
func (s *lightClientStateProvider) State(ctx context.Context, height uint64) (sm.State, error) {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
state := sm.State{
|
|
ChainID: s.lc.ChainID(),
|
|
Version: s.version,
|
|
InitialHeight: s.initialHeight,
|
|
}
|
|
if state.InitialHeight == 0 {
|
|
state.InitialHeight = 1
|
|
}
|
|
|
|
// The snapshot height maps onto the state heights as follows:
|
|
//
|
|
// height: last block, i.e. the snapshotted height
|
|
// height+1: current block, i.e. the first block we'll process after the snapshot
|
|
// height+2: next block, i.e. the second block after the snapshot
|
|
//
|
|
// We need to fetch the NextValidators from height+2 because if the application changed
|
|
// the validator set at the snapshot height then this only takes effect at height+2.
|
|
lastLightBlock, err := s.lc.VerifyLightBlockAtHeight(ctx, int64(height), time.Now())
|
|
if err != nil {
|
|
return sm.State{}, err
|
|
}
|
|
curLightBlock, err := s.lc.VerifyLightBlockAtHeight(ctx, int64(height+1), time.Now())
|
|
if err != nil {
|
|
return sm.State{}, err
|
|
}
|
|
nextLightBlock, err := s.lc.VerifyLightBlockAtHeight(ctx, int64(height+2), time.Now())
|
|
if err != nil {
|
|
return sm.State{}, err
|
|
}
|
|
|
|
state.LastBlockHeight = lastLightBlock.Height
|
|
state.LastBlockTime = lastLightBlock.Time
|
|
state.LastBlockID = lastLightBlock.Commit.BlockID
|
|
state.AppHash = curLightBlock.AppHash
|
|
state.LastResultsHash = curLightBlock.LastResultsHash
|
|
state.LastValidators = lastLightBlock.ValidatorSet
|
|
state.Validators = curLightBlock.ValidatorSet
|
|
state.NextValidators = nextLightBlock.ValidatorSet
|
|
state.LastHeightValidatorsChanged = nextLightBlock.Height
|
|
|
|
// We'll also need to fetch consensus params via RPC, using light client verification.
|
|
primaryURL, ok := s.providers[s.lc.Primary()]
|
|
if !ok || primaryURL == "" {
|
|
return sm.State{}, fmt.Errorf("could not find address for primary light client provider")
|
|
}
|
|
primaryRPC, err := rpcClient(primaryURL)
|
|
if err != nil {
|
|
return sm.State{}, fmt.Errorf("unable to create RPC client: %w", err)
|
|
}
|
|
rpcclient := lightrpc.NewClient(primaryRPC, s.lc)
|
|
result, err := rpcclient.ConsensusParams(ctx, &nextLightBlock.Height)
|
|
if err != nil {
|
|
return sm.State{}, fmt.Errorf("unable to fetch consensus parameters for height %v: %w",
|
|
nextLightBlock.Height, err)
|
|
}
|
|
state.ConsensusParams = result.ConsensusParams
|
|
|
|
return state, nil
|
|
}
|
|
|
|
// rpcClient sets up a new RPC client
|
|
func rpcClient(server string) (*rpchttp.HTTP, error) {
|
|
if !strings.Contains(server, "://") {
|
|
server = "http://" + server
|
|
}
|
|
c, err := rpchttp.New(server, "/websocket")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return c, nil
|
|
}
|