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setup.go
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setup.go
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package node
import (
"bytes"
"context"
"encoding/hex"
"errors"
"fmt"
"net"
"os"
"strings"
"time"
_ "net/http/pprof" //nolint: gosec,gci // securely exposed on separate, optional port
_ "github.com/lib/pq" //nolint: gci // provide the psql db driver.
dbm "github.com/cometbft/cometbft-db"
abci "github.com/cometbft/cometbft/abci/types"
cfg "github.com/cometbft/cometbft/config"
"github.com/cometbft/cometbft/crypto"
"github.com/cometbft/cometbft/crypto/tmhash"
"github.com/cometbft/cometbft/internal/blocksync"
cs "github.com/cometbft/cometbft/internal/consensus"
"github.com/cometbft/cometbft/internal/evidence"
"github.com/cometbft/cometbft/internal/statesync"
"github.com/cometbft/cometbft/libs/log"
"github.com/cometbft/cometbft/light"
mempl "github.com/cometbft/cometbft/mempool"
"github.com/cometbft/cometbft/p2p"
"github.com/cometbft/cometbft/p2p/pex"
"github.com/cometbft/cometbft/privval"
"github.com/cometbft/cometbft/proxy"
sm "github.com/cometbft/cometbft/state"
"github.com/cometbft/cometbft/state/indexer"
"github.com/cometbft/cometbft/state/indexer/block"
"github.com/cometbft/cometbft/state/txindex"
"github.com/cometbft/cometbft/store"
"github.com/cometbft/cometbft/types"
"github.com/cometbft/cometbft/version"
)
const readHeaderTimeout = 10 * time.Second
// ChecksummedGenesisDoc combines a GenesisDoc together with its
// SHA256 checksum.
type ChecksummedGenesisDoc struct {
GenesisDoc *types.GenesisDoc
Sha256Checksum []byte
}
// GenesisDocProvider returns a GenesisDoc together with its SHA256 checksum.
// It allows the GenesisDoc to be pulled from sources other than the
// filesystem, for instance from a distributed key-value store cluster.
type GenesisDocProvider func() (ChecksummedGenesisDoc, error)
// DefaultGenesisDocProviderFunc returns a GenesisDocProvider that loads
// the GenesisDoc from the config.GenesisFile() on the filesystem.
func DefaultGenesisDocProviderFunc(config *cfg.Config) GenesisDocProvider {
return func() (ChecksummedGenesisDoc, error) {
// FIXME: find a way to stream the file incrementally,
// for the JSON parser and the checksum computation.
// https://github.com/cometbft/cometbft/issues/1302
jsonBlob, err := os.ReadFile(config.GenesisFile())
if err != nil {
return ChecksummedGenesisDoc{}, fmt.Errorf("couldn't read GenesisDoc file: %w", err)
}
incomingChecksum := tmhash.Sum(jsonBlob)
genDoc, err := types.GenesisDocFromJSON(jsonBlob)
if err != nil {
return ChecksummedGenesisDoc{}, err
}
return ChecksummedGenesisDoc{GenesisDoc: genDoc, Sha256Checksum: incomingChecksum}, nil
}
}
// Provider takes a config and a logger and returns a ready to go Node.
type Provider func(*cfg.Config, log.Logger) (*Node, error)
// DefaultNewNode returns a CometBFT node with default settings for the
// PrivValidator, ClientCreator, GenesisDoc, and DBProvider.
// It implements NodeProvider.
func DefaultNewNode(config *cfg.Config, logger log.Logger) (*Node, error) {
nodeKey, err := p2p.LoadOrGenNodeKey(config.NodeKeyFile())
if err != nil {
return nil, fmt.Errorf("failed to load or gen node key %s: %w", config.NodeKeyFile(), err)
}
return NewNode(context.Background(), config,
privval.LoadOrGenFilePV(config.PrivValidatorKeyFile(), config.PrivValidatorStateFile()),
nodeKey,
proxy.DefaultClientCreator(config.ProxyApp, config.ABCI, config.DBDir()),
DefaultGenesisDocProviderFunc(config),
cfg.DefaultDBProvider,
DefaultMetricsProvider(config.Instrumentation),
logger,
)
}
// MetricsProvider returns a consensus, p2p and mempool Metrics.
type MetricsProvider func(chainID string) (*cs.Metrics, *p2p.Metrics, *mempl.Metrics, *sm.Metrics, *store.Metrics, *proxy.Metrics, *blocksync.Metrics, *statesync.Metrics)
// DefaultMetricsProvider returns Metrics build using Prometheus client library
// if Prometheus is enabled. Otherwise, it returns no-op Metrics.
func DefaultMetricsProvider(config *cfg.InstrumentationConfig) MetricsProvider {
return func(chainID string) (*cs.Metrics, *p2p.Metrics, *mempl.Metrics, *sm.Metrics, *store.Metrics, *proxy.Metrics, *blocksync.Metrics, *statesync.Metrics) {
if config.Prometheus {
return cs.PrometheusMetrics(config.Namespace, "chain_id", chainID),
p2p.PrometheusMetrics(config.Namespace, "chain_id", chainID),
mempl.PrometheusMetrics(config.Namespace, "chain_id", chainID),
sm.PrometheusMetrics(config.Namespace, "chain_id", chainID),
store.PrometheusMetrics(config.Namespace, "chain_id", chainID),
proxy.PrometheusMetrics(config.Namespace, "chain_id", chainID),
blocksync.PrometheusMetrics(config.Namespace, "chain_id", chainID),
statesync.PrometheusMetrics(config.Namespace, "chain_id", chainID)
}
return cs.NopMetrics(), p2p.NopMetrics(), mempl.NopMetrics(), sm.NopMetrics(), store.NopMetrics(), proxy.NopMetrics(), blocksync.NopMetrics(), statesync.NopMetrics()
}
}
type blockSyncReactor interface {
SwitchToBlockSync(state sm.State) error
}
// ------------------------------------------------------------------------------
func initDBs(config *cfg.Config, dbProvider cfg.DBProvider) (bsDB dbm.DB, stateDB dbm.DB, err error) {
bsDB, err = dbProvider(&cfg.DBContext{ID: "blockstore", Config: config})
if err != nil {
return nil, nil, err
}
stateDB, err = dbProvider(&cfg.DBContext{ID: "state", Config: config})
if err != nil {
return nil, nil, err
}
return bsDB, stateDB, nil
}
func createAndStartProxyAppConns(clientCreator proxy.ClientCreator, logger log.Logger, metrics *proxy.Metrics) (proxy.AppConns, error) {
proxyApp := proxy.NewAppConns(clientCreator, metrics)
proxyApp.SetLogger(logger.With("module", "proxy"))
if err := proxyApp.Start(); err != nil {
return nil, fmt.Errorf("error starting proxy app connections: %v", err)
}
return proxyApp, nil
}
func createAndStartEventBus(logger log.Logger) (*types.EventBus, error) {
eventBus := types.NewEventBus()
eventBus.SetLogger(logger.With("module", "events"))
if err := eventBus.Start(); err != nil {
return nil, err
}
return eventBus, nil
}
func createAndStartIndexerService(
config *cfg.Config,
chainID string,
dbProvider cfg.DBProvider,
eventBus *types.EventBus,
logger log.Logger,
) (*txindex.IndexerService, txindex.TxIndexer, indexer.BlockIndexer, error) {
var (
txIndexer txindex.TxIndexer
blockIndexer indexer.BlockIndexer
)
txIndexer, blockIndexer, err := block.IndexerFromConfig(config, dbProvider, chainID)
if err != nil {
return nil, nil, nil, err
}
txIndexer.SetLogger(logger.With("module", "txindex"))
blockIndexer.SetLogger(logger.With("module", "txindex"))
indexerService := txindex.NewIndexerService(txIndexer, blockIndexer, eventBus, false)
indexerService.SetLogger(logger.With("module", "txindex"))
if err := indexerService.Start(); err != nil {
return nil, nil, nil, err
}
return indexerService, txIndexer, blockIndexer, nil
}
func doHandshake(
ctx context.Context,
stateStore sm.Store,
state sm.State,
blockStore sm.BlockStore,
genDoc *types.GenesisDoc,
eventBus types.BlockEventPublisher,
proxyApp proxy.AppConns,
consensusLogger log.Logger,
) error {
handshaker := cs.NewHandshaker(stateStore, state, blockStore, genDoc)
handshaker.SetLogger(consensusLogger)
handshaker.SetEventBus(eventBus)
if err := handshaker.Handshake(ctx, proxyApp); err != nil {
return fmt.Errorf("error during handshake: %v", err)
}
return nil
}
func logNodeStartupInfo(state sm.State, pubKey crypto.PubKey, logger, consensusLogger log.Logger) {
// Log the version info.
logger.Info("Version info",
"tendermint_version", version.CMTSemVer,
"abci", version.ABCISemVer,
"block", version.BlockProtocol,
"p2p", version.P2PProtocol,
"commit_hash", version.CMTGitCommitHash,
)
// If the state and software differ in block version, at least log it.
if state.Version.Consensus.Block != version.BlockProtocol {
logger.Info("Software and state have different block protocols",
"software", version.BlockProtocol,
"state", state.Version.Consensus.Block,
)
}
addr := pubKey.Address()
// Log whether this node is a validator or an observer
if state.Validators.HasAddress(addr) {
consensusLogger.Info("This node is a validator", "addr", addr, "pubKey", pubKey)
} else {
consensusLogger.Info("This node is not a validator", "addr", addr, "pubKey", pubKey)
}
}
func onlyValidatorIsUs(state sm.State, pubKey crypto.PubKey) bool {
if state.Validators.Size() > 1 {
return false
}
addr, _ := state.Validators.GetByIndex(0)
return bytes.Equal(pubKey.Address(), addr)
}
// createMempoolAndMempoolReactor creates a mempool and a mempool reactor based on the config.
func createMempoolAndMempoolReactor(
config *cfg.Config,
proxyApp proxy.AppConns,
state sm.State,
waitSync bool,
memplMetrics *mempl.Metrics,
logger log.Logger,
) (mempl.Mempool, waitSyncP2PReactor) {
switch config.Mempool.Type {
// allow empty string for backward compatibility
case cfg.MempoolTypeFlood, "":
logger = logger.With("module", "mempool")
mp := mempl.NewCListMempool(
config.Mempool,
proxyApp.Mempool(),
state.LastBlockHeight,
mempl.WithMetrics(memplMetrics),
mempl.WithPreCheck(sm.TxPreCheck(state)),
mempl.WithPostCheck(sm.TxPostCheck(state)),
)
mp.SetLogger(logger)
reactor := mempl.NewReactor(
config.Mempool,
mp,
waitSync,
)
if config.Consensus.WaitForTxs() {
mp.EnableTxsAvailable()
}
reactor.SetLogger(logger)
return mp, reactor
case cfg.MempoolTypeNop:
// Strictly speaking, there's no need to have a `mempl.NopMempoolReactor`, but
// adding it leads to a cleaner code.
return &mempl.NopMempool{}, mempl.NewNopMempoolReactor()
default:
panic(fmt.Sprintf("unknown mempool type: %q", config.Mempool.Type))
}
}
func createEvidenceReactor(config *cfg.Config, dbProvider cfg.DBProvider,
stateStore sm.Store, blockStore *store.BlockStore, logger log.Logger,
) (*evidence.Reactor, *evidence.Pool, error) {
evidenceDB, err := dbProvider(&cfg.DBContext{ID: "evidence", Config: config})
if err != nil {
return nil, nil, err
}
evidenceLogger := logger.With("module", "evidence")
evidencePool, err := evidence.NewPool(evidenceDB, stateStore, blockStore, evidence.WithDBKeyLayout(config.Storage.ExperimentalKeyLayout))
if err != nil {
return nil, nil, err
}
evidenceReactor := evidence.NewReactor(evidencePool)
evidenceReactor.SetLogger(evidenceLogger)
return evidenceReactor, evidencePool, nil
}
func createBlocksyncReactor(config *cfg.Config,
state sm.State,
blockExec *sm.BlockExecutor,
blockStore *store.BlockStore,
blockSync bool,
logger log.Logger,
metrics *blocksync.Metrics,
offlineStateSyncHeight int64,
) (bcReactor p2p.Reactor, err error) {
switch config.BlockSync.Version {
case "v0":
bcReactor = blocksync.NewReactor(state.Copy(), blockExec, blockStore, blockSync, metrics, offlineStateSyncHeight)
case "v1", "v2":
return nil, fmt.Errorf("block sync version %s has been deprecated. Please use v0", config.BlockSync.Version)
default:
return nil, fmt.Errorf("unknown block sync version %s", config.BlockSync.Version)
}
bcReactor.SetLogger(logger.With("module", "blocksync"))
return bcReactor, nil
}
func createConsensusReactor(config *cfg.Config,
state sm.State,
blockExec *sm.BlockExecutor,
blockStore sm.BlockStore,
mempool mempl.Mempool,
evidencePool *evidence.Pool,
privValidator types.PrivValidator,
csMetrics *cs.Metrics,
waitSync bool,
eventBus *types.EventBus,
consensusLogger log.Logger,
offlineStateSyncHeight int64,
) (*cs.Reactor, *cs.State) {
consensusState := cs.NewState(
config.Consensus,
state.Copy(),
blockExec,
blockStore,
mempool,
evidencePool,
cs.StateMetrics(csMetrics),
cs.OfflineStateSyncHeight(offlineStateSyncHeight),
)
consensusState.SetLogger(consensusLogger)
if privValidator != nil {
consensusState.SetPrivValidator(privValidator)
}
consensusReactor := cs.NewReactor(consensusState, waitSync, cs.ReactorMetrics(csMetrics))
consensusReactor.SetLogger(consensusLogger)
// services which will be publishing and/or subscribing for messages (events)
// consensusReactor will set it on consensusState and blockExecutor
consensusReactor.SetEventBus(eventBus)
return consensusReactor, consensusState
}
func createTransport(
config *cfg.Config,
nodeInfo p2p.NodeInfo,
nodeKey *p2p.NodeKey,
proxyApp proxy.AppConns,
) (
*p2p.MultiplexTransport,
[]p2p.PeerFilterFunc,
) {
var (
mConnConfig = p2p.MConnConfig(config.P2P)
transport = p2p.NewMultiplexTransport(nodeInfo, *nodeKey, mConnConfig)
connFilters = []p2p.ConnFilterFunc{}
peerFilters = []p2p.PeerFilterFunc{}
)
if !config.P2P.AllowDuplicateIP {
connFilters = append(connFilters, p2p.ConnDuplicateIPFilter())
}
// Filter peers by addr or pubkey with an ABCI query.
// If the query return code is OK, add peer.
if config.FilterPeers {
connFilters = append(
connFilters,
// ABCI query for address filtering.
func(_ p2p.ConnSet, c net.Conn, _ []net.IP) error {
res, err := proxyApp.Query().Query(context.TODO(), &abci.QueryRequest{
Path: "/p2p/filter/addr/" + c.RemoteAddr().String(),
})
if err != nil {
return err
}
if res.IsErr() {
return fmt.Errorf("error querying abci app: %v", res)
}
return nil
},
)
peerFilters = append(
peerFilters,
// ABCI query for ID filtering.
func(_ p2p.IPeerSet, p p2p.Peer) error {
res, err := proxyApp.Query().Query(context.TODO(), &abci.QueryRequest{
Path: fmt.Sprintf("/p2p/filter/id/%s", p.ID()),
})
if err != nil {
return err
}
if res.IsErr() {
return fmt.Errorf("error querying abci app: %v", res)
}
return nil
},
)
}
p2p.MultiplexTransportConnFilters(connFilters...)(transport)
// Limit the number of incoming connections.
max := config.P2P.MaxNumInboundPeers + len(splitAndTrimEmpty(config.P2P.UnconditionalPeerIDs, ",", " "))
p2p.MultiplexTransportMaxIncomingConnections(max)(transport)
return transport, peerFilters
}
func createSwitch(config *cfg.Config,
transport p2p.Transport,
p2pMetrics *p2p.Metrics,
peerFilters []p2p.PeerFilterFunc,
mempoolReactor p2p.Reactor,
bcReactor p2p.Reactor,
stateSyncReactor *statesync.Reactor,
consensusReactor *cs.Reactor,
evidenceReactor *evidence.Reactor,
nodeInfo p2p.NodeInfo,
nodeKey *p2p.NodeKey,
p2pLogger log.Logger,
) *p2p.Switch {
sw := p2p.NewSwitch(
config.P2P,
transport,
p2p.WithMetrics(p2pMetrics),
p2p.SwitchPeerFilters(peerFilters...),
)
sw.SetLogger(p2pLogger)
if config.Mempool.Type != cfg.MempoolTypeNop {
sw.AddReactor("MEMPOOL", mempoolReactor)
}
sw.AddReactor("BLOCKSYNC", bcReactor)
sw.AddReactor("CONSENSUS", consensusReactor)
sw.AddReactor("EVIDENCE", evidenceReactor)
sw.AddReactor("STATESYNC", stateSyncReactor)
sw.SetNodeInfo(nodeInfo)
sw.SetNodeKey(nodeKey)
p2pLogger.Info("P2P Node ID", "ID", nodeKey.ID(), "file", config.NodeKeyFile())
return sw
}
func createAddrBookAndSetOnSwitch(config *cfg.Config, sw *p2p.Switch,
p2pLogger log.Logger, nodeKey *p2p.NodeKey,
) (pex.AddrBook, error) {
addrBook := pex.NewAddrBook(config.P2P.AddrBookFile(), config.P2P.AddrBookStrict)
addrBook.SetLogger(p2pLogger.With("book", config.P2P.AddrBookFile()))
// Add ourselves to addrbook to prevent dialing ourselves
if config.P2P.ExternalAddress != "" {
addr, err := p2p.NewNetAddressString(p2p.IDAddressString(nodeKey.ID(), config.P2P.ExternalAddress))
if err != nil {
return nil, fmt.Errorf("p2p.external_address is incorrect: %w", err)
}
addrBook.AddOurAddress(addr)
}
if config.P2P.ListenAddress != "" {
addr, err := p2p.NewNetAddressString(p2p.IDAddressString(nodeKey.ID(), config.P2P.ListenAddress))
if err != nil {
return nil, fmt.Errorf("p2p.laddr is incorrect: %w", err)
}
addrBook.AddOurAddress(addr)
}
sw.SetAddrBook(addrBook)
return addrBook, nil
}
func createPEXReactorAndAddToSwitch(addrBook pex.AddrBook, config *cfg.Config,
sw *p2p.Switch, logger log.Logger,
) *pex.Reactor {
// TODO persistent peers ? so we can have their DNS addrs saved
pexReactor := pex.NewReactor(addrBook,
&pex.ReactorConfig{
Seeds: splitAndTrimEmpty(config.P2P.Seeds, ",", " "),
SeedMode: config.P2P.SeedMode,
// See consensus/reactor.go: blocksToContributeToBecomeGoodPeer 10000
// blocks assuming 10s blocks ~ 28 hours.
// TODO (melekes): make it dynamic based on the actual block latencies
// from the live network.
// https://github.com/tendermint/tendermint/issues/3523
SeedDisconnectWaitPeriod: 28 * time.Hour,
PersistentPeersMaxDialPeriod: config.P2P.PersistentPeersMaxDialPeriod,
})
pexReactor.SetLogger(logger.With("module", "pex"))
sw.AddReactor("PEX", pexReactor)
return pexReactor
}
// startStateSync starts an asynchronous state sync process, then switches to block sync mode.
func startStateSync(
ssR *statesync.Reactor,
bcR blockSyncReactor,
stateProvider statesync.StateProvider,
config *cfg.StateSyncConfig,
stateStore sm.Store,
blockStore *store.BlockStore,
state sm.State,
dbKeyLayoutVersion string,
) error {
ssR.Logger.Info("Starting state sync")
if stateProvider == nil {
var err error
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
stateProvider, err = statesync.NewLightClientStateProviderWithDBKeyVersion(
ctx,
state.ChainID, state.Version, state.InitialHeight,
config.RPCServers, light.TrustOptions{
Period: config.TrustPeriod,
Height: config.TrustHeight,
Hash: config.TrustHashBytes(),
}, ssR.Logger.With("module", "light"),
dbKeyLayoutVersion)
if err != nil {
return fmt.Errorf("failed to set up light client state provider: %w", err)
}
}
go func() {
state, commit, err := ssR.Sync(stateProvider, config.DiscoveryTime)
if err != nil {
ssR.Logger.Error("State sync failed", "err", err)
return
}
err = stateStore.Bootstrap(state)
if err != nil {
ssR.Logger.Error("Failed to bootstrap node with new state", "err", err)
return
}
err = blockStore.SaveSeenCommit(state.LastBlockHeight, commit)
if err != nil {
ssR.Logger.Error("Failed to store last seen commit", "err", err)
return
}
err = bcR.SwitchToBlockSync(state)
if err != nil {
ssR.Logger.Error("Failed to switch to block sync", "err", err)
return
}
}()
return nil
}
// ------------------------------------------------------------------------------
var (
genesisDocKey = []byte("genesisDoc")
genesisDocHashKey = []byte("genesisDocHash")
)
func LoadStateFromDBOrGenesisDocProviderWithConfig(
stateDB dbm.DB,
genesisDocProvider GenesisDocProvider,
operatorGenesisHashHex string,
config *cfg.Config,
) (sm.State, *types.GenesisDoc, error) {
// Get genesis doc hash
genDocHash, err := stateDB.Get(genesisDocHashKey)
if err != nil {
return sm.State{}, nil, fmt.Errorf("error retrieving genesis doc hash: %w", err)
}
csGenDoc, err := genesisDocProvider()
if err != nil {
return sm.State{}, nil, err
}
if err = csGenDoc.GenesisDoc.ValidateAndComplete(); err != nil {
return sm.State{}, nil, fmt.Errorf("error in genesis doc: %w", err)
}
// Validate that existing or recently saved genesis file hash matches optional --genesis_hash passed by operator
if operatorGenesisHashHex != "" {
decodedOperatorGenesisHash, err := hex.DecodeString(operatorGenesisHashHex)
if err != nil {
return sm.State{}, nil, errors.New("genesis hash provided by operator cannot be decoded")
}
if !bytes.Equal(csGenDoc.Sha256Checksum, decodedOperatorGenesisHash) {
return sm.State{}, nil, errors.New("genesis doc hash in db does not match passed --genesis_hash value")
}
}
if len(genDocHash) == 0 {
// Save the genDoc hash in the store if it doesn't already exist for future verification
if err = stateDB.SetSync(genesisDocHashKey, csGenDoc.Sha256Checksum); err != nil {
return sm.State{}, nil, fmt.Errorf("failed to save genesis doc hash to db: %w", err)
}
} else {
if !bytes.Equal(genDocHash, csGenDoc.Sha256Checksum) {
return sm.State{}, nil, errors.New("genesis doc hash in db does not match loaded genesis doc")
}
}
dbKeyLayoutVersion := ""
if config != nil {
dbKeyLayoutVersion = config.Storage.ExperimentalKeyLayout
}
stateStore := sm.NewStore(stateDB, sm.StoreOptions{
DiscardABCIResponses: false,
DBKeyLayout: dbKeyLayoutVersion,
})
state, err := stateStore.LoadFromDBOrGenesisDoc(csGenDoc.GenesisDoc)
if err != nil {
return sm.State{}, nil, err
}
return state, csGenDoc.GenesisDoc, nil
}
// LoadStateFromDBOrGenesisDocProvider attempts to load the state from the
// database, or creates one using the given genesisDocProvider. On success this also
// returns the genesis doc loaded through the given provider.
// Note that if you don't have a version of the key layout set in your DB already,
// and no config is passed, it will default to v1.
func LoadStateFromDBOrGenesisDocProvider(
stateDB dbm.DB,
genesisDocProvider GenesisDocProvider,
operatorGenesisHashHex string,
) (sm.State, *types.GenesisDoc, error) {
return LoadStateFromDBOrGenesisDocProviderWithConfig(stateDB, genesisDocProvider, operatorGenesisHashHex, nil)
}
func createAndStartPrivValidatorSocketClient(
listenAddr,
chainID string,
logger log.Logger,
) (types.PrivValidator, error) {
pve, err := privval.NewSignerListener(listenAddr, logger)
if err != nil {
return nil, fmt.Errorf("failed to start private validator: %w", err)
}
pvsc, err := privval.NewSignerClient(pve, chainID)
if err != nil {
return nil, fmt.Errorf("failed to start private validator: %w", err)
}
// try to get a pubkey from private validate first time
_, err = pvsc.GetPubKey()
if err != nil {
return nil, fmt.Errorf("can't get pubkey: %w", err)
}
const (
retries = 50 // 50 * 100ms = 5s total
timeout = 100 * time.Millisecond
)
pvscWithRetries := privval.NewRetrySignerClient(pvsc, retries, timeout)
return pvscWithRetries, nil
}
// splitAndTrimEmpty slices s into all subslices separated by sep and returns a
// slice of the string s with all leading and trailing Unicode code points
// contained in cutset removed. If sep is empty, SplitAndTrim splits after each
// UTF-8 sequence. First part is equivalent to strings.SplitN with a count of
// -1. also filter out empty strings, only return non-empty strings.
func splitAndTrimEmpty(s, sep, cutset string) []string {
if s == "" {
return []string{}
}
spl := strings.Split(s, sep)
nonEmptyStrings := make([]string, 0, len(spl))
for i := 0; i < len(spl); i++ {
element := strings.Trim(spl[i], cutset)
if element != "" {
nonEmptyStrings = append(nonEmptyStrings, element)
}
}
return nonEmptyStrings
}