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171 lines
5.1 KiB
171 lines
5.1 KiB
package commands
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import (
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"fmt"
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"net/http"
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"os"
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"strings"
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"time"
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"github.com/spf13/cobra"
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"github.com/tendermint/go-amino"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/libs/log"
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tmos "github.com/tendermint/tendermint/libs/os"
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"github.com/tendermint/tendermint/light"
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lproxy "github.com/tendermint/tendermint/light/proxy"
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lrpc "github.com/tendermint/tendermint/light/rpc"
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dbs "github.com/tendermint/tendermint/light/store/db"
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rpchttp "github.com/tendermint/tendermint/rpc/client/http"
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rpcserver "github.com/tendermint/tendermint/rpc/jsonrpc/server"
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)
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// LightCmd represents the base command when called without any subcommands
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var LightCmd = &cobra.Command{
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Use: "light [chainID]",
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Short: "Run a light client proxy server, verifying Tendermint rpc",
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Long: `Run a light client proxy server, verifying Tendermint rpc.
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All calls that can be tracked back to a block header by a proof
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will be verified before passing them back to the caller. Other than
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that, it will present the same interface as a full Tendermint node.
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Example:
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start a fresh instance:
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light cosmoshub-3 -p http://52.57.29.196:26657 -w http://public-seed-node.cosmoshub.certus.one:26657
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--height 962118 --hash 28B97BE9F6DE51AC69F70E0B7BFD7E5C9CD1A595B7DC31AFF27C50D4948020CD
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continue from latest state:
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light cosmoshub-3 -p http://52.57.29.196:26657 -w http://public-seed-node.cosmoshub.certus.one:26657
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`,
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RunE: runProxy,
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Args: cobra.ExactArgs(1),
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Example: `light cosmoshub-3 -p http://52.57.29.196:26657 -w http://public-seed-node.cosmoshub.certus.one:26657
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--height 962118 --hash 28B97BE9F6DE51AC69F70E0B7BFD7E5C9CD1A595B7DC31AFF27C50D4948020CD`,
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}
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var (
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listenAddr string
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primaryAddr string
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witnessAddrsJoined string
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chainID string
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home string
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maxOpenConnections int
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trustingPeriod time.Duration
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trustedHeight int64
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trustedHash []byte
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verbose bool
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)
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func init() {
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LightCmd.Flags().StringVar(&listenAddr, "laddr", "tcp://localhost:8888",
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"Serve the proxy on the given address")
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LightCmd.Flags().StringVarP(&primaryAddr, "primary", "p", "",
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"Connect to a Tendermint node at this address")
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LightCmd.Flags().StringVarP(&witnessAddrsJoined, "witnesses", "w", "",
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"Tendermint nodes to cross-check the primary node, comma-separated")
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LightCmd.Flags().StringVar(&home, "home-dir", ".tendermint-light", "Specify the home directory")
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LightCmd.Flags().IntVar(
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&maxOpenConnections,
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"max-open-connections",
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900,
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"Maximum number of simultaneous connections (including WebSocket).")
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LightCmd.Flags().DurationVar(&trustingPeriod, "trusting-period", 168*time.Hour,
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"Trusting period. Should be significantly less than the unbonding period")
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LightCmd.Flags().Int64Var(&trustedHeight, "height", 1, "Trusted header's height")
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LightCmd.Flags().BytesHexVar(&trustedHash, "hash", []byte{}, "Trusted header's hash")
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LightCmd.Flags().BoolVar(&verbose, "verbose", false, "Verbose output")
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}
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func runProxy(cmd *cobra.Command, args []string) error {
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// Initialise logger.
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logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout))
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var option log.Option
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if verbose {
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option, _ = log.AllowLevel("debug")
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} else {
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option, _ = log.AllowLevel("info")
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}
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logger = log.NewFilter(logger, option)
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chainID = args[0]
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logger.Info("Creating client...", "chainID", chainID)
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witnessesAddrs := strings.Split(witnessAddrsJoined, ",")
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db, err := dbm.NewGoLevelDB("light-client-db", home)
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if err != nil {
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return fmt.Errorf("can't create a db: %w", err)
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}
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var c *light.Client
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if trustedHeight > 0 && len(trustedHash) > 0 { // fresh installation
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c, err = light.NewHTTPClient(
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chainID,
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light.TrustOptions{
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Period: trustingPeriod,
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Height: trustedHeight,
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Hash: trustedHash,
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},
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primaryAddr,
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witnessesAddrs,
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dbs.New(db, chainID),
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light.Logger(logger),
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)
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} else { // continue from latest state
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c, err = light.NewHTTPClientFromTrustedStore(
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chainID,
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trustingPeriod,
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primaryAddr,
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witnessesAddrs,
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dbs.New(db, chainID),
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light.Logger(logger),
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)
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}
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if err != nil {
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return err
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}
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rpcClient, err := rpchttp.New(primaryAddr, "/websocket")
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if err != nil {
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return fmt.Errorf("http client for %s: %w", primaryAddr, err)
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}
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cfg := rpcserver.DefaultConfig()
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cfg.MaxBodyBytes = config.RPC.MaxBodyBytes
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cfg.MaxHeaderBytes = config.RPC.MaxHeaderBytes
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cfg.MaxOpenConnections = maxOpenConnections
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// If necessary adjust global WriteTimeout to ensure it's greater than
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// TimeoutBroadcastTxCommit.
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// See https://github.com/tendermint/tendermint/issues/3435
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if cfg.WriteTimeout <= config.RPC.TimeoutBroadcastTxCommit {
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cfg.WriteTimeout = config.RPC.TimeoutBroadcastTxCommit + 1*time.Second
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}
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p := lproxy.Proxy{
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Addr: listenAddr,
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Config: cfg,
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Codec: amino.NewCodec(),
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Client: lrpc.NewClient(rpcClient, c),
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Logger: logger,
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}
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// Stop upon receiving SIGTERM or CTRL-C.
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tmos.TrapSignal(logger, func() {
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p.Listener.Close()
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})
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logger.Info("Starting proxy...", "laddr", listenAddr)
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if err := p.ListenAndServe(); err != http.ErrServerClosed {
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// Error starting or closing listener:
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logger.Error("proxy ListenAndServe", "err", err)
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}
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return nil
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}
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