add zetaclientd gen-pre-params command

cmd/zetaclientd/gen_pre_params.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/binance-chain/tss-lib/ecdsa/keygen"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	RootCmd.AddCommand(GenPrePramsCmd)
+}
+
+var GenPrePramsCmd = &cobra.Command{
+	Use:   "gen-pre-params <path>",
+	Short: "Generate pre parameters for TSS",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		startTime := time.Now()
+		preParams, err := keygen.GeneratePreParams(time.Second * 300)
+		if err != nil {
+			return err
+		}
+
+		file, err := os.OpenFile(args[0], os.O_RDWR|os.O_CREATE, 0600)
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+		err = json.NewEncoder(file).Encode(preParams)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("Generated new pre-parameters in %v\n", time.Since(startTime))
+		return nil
+	},
+}

contrib/localnet/scripts/start-zetaclientd.sh

@@ -15,6 +15,12 @@ set_sepolia_endpoint() {
   jq '.EVMChainConfigs."11155111".Endpoint = "http://eth2:8545"' /root/.zetacored/config/zetaclient_config.json > tmp.json && mv tmp.json /root/.zetacored/config/zetaclient_config.json
 }
 
+# generate pre-params as early as possible
+# to reach keygen height in time
+#
+# consider caching these on a docker volume
+zetaclientd gen-pre-params ~/preParams.json
+
 # Wait for authorized_keys file to exist (generated by zetacore0)
 while [ ! -f ~/.ssh/authorized_keys ]; do
     echo "Waiting for authorized_keys file to exist..."