Add dedicated eth staking example (#36)

examples/ethereum/dedicated-eth-stake/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"context"
+	"log"
+	"math/big"
+	"os"
+
+	"github.com/coinbase/coinbase-sdk-go/gen/client"
+	"github.com/coinbase/coinbase-sdk-go/pkg/coinbase"
+)
+
+var (
+	networkID = client.NETWORKIDENTIFIER_ETHEREUM_HOLESKY
+	assetID   = coinbase.Eth
+)
+
+/*
+ * This example code stakes ETH on the Holesky network via Dedicated ETH Staking.
+ * Run the code with 'go run examples/ethereum/dedicated-eth-stake/main.go <api_key_file_path> <funding_wallet_address>'
+ */
+
+func main() {
+	ctx := context.Background()
+
+	client, err := coinbase.NewClient(
+		coinbase.WithAPIKeyFromJSON(os.Args[1]),
+	)
+	if err != nil {
+		log.Fatalf("error creating coinbase client: %v", err)
+	}
+
+	address := coinbase.NewExternalAddress(string(networkID), os.Args[2])
+
+	stakeableBalance, err := client.GetStakeableBalance(ctx, assetID, address, coinbase.WithStakingBalanceMode(coinbase.StakingOperationModeNative))
+	if err != nil {
+		log.Fatalf("error getting stakeable balance: %v", err)
+	}
+
+	log.Printf("stakeable balance: %s\n", stakeableBalance)
+
+	listMyValidators(ctx, client, string(networkID), assetID)
+
+	stakeOperation, err := client.BuildStakeOperation(
+		ctx,
+		big.NewFloat(64),
+		assetID,
+		address,
+		coinbase.WithStakingOperationMode(coinbase.StakingOperationModeNative),
+	)
+	if err != nil {
+		log.Fatalf("error building staking operation: %v", err)
+	}
+
+	stakeOperation, err = client.Wait(ctx, stakeOperation, coinbase.WithWaitTimeoutSeconds(600))
+	if err != nil {
+		log.Fatalf("error waiting for staking operation: %v", err)
+	}
+
+	log.Printf("staking operation ID: %s\n", stakeOperation.ID())
+
+	for index, tx := range stakeOperation.Transactions() {
+		log.Printf("Deposit tx %d: %s\n", index+1, tx.UnsignedPayload())
+	}
+
+	listMyValidators(ctx, client, string(networkID), assetID)
+}
+
+func listMyValidators(ctx context.Context, client *coinbase.Client, networkID string, assetID string) {
+	validators, err := client.ListValidators(ctx, networkID, assetID)
+	if err != nil {
+		log.Fatalf("error listing validators: %v", err)
+	}
+
+	for _, validator := range validators {
+		log.Printf(validator.ToString())
+	}
+}