# Go

### gRPC

[示例地址](https://github.com/BlockRazorinc/sui_go_example/blob/main/example/grpc_example/grpc_demo.go)

```go
package main

import (
	"context"
	"encoding/base64"
	"fmt"
	"log"
	"time"

	"github.com/BlockRazorinc/sui_go_example/blockrzsdk"
	pb "github.com/BlockRazorinc/sui_go_example/sui/rpc/v2"

	"github.com/block-vision/sui-go-sdk/models"
	"github.com/block-vision/sui-go-sdk/signer"
	"github.com/block-vision/sui-go-sdk/sui"
	"github.com/block-vision/sui-go-sdk/transaction"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/metadata"
)

const (
	OfficialRpcUrl = "https://fullnode.mainnet.sui.io"
	// Gas object
	GasObjectId = "<YOUR_GAS_OBJECT_ID>"
	// Receiver address
	ReceiverAddr = "<YOUR_RECEIVER_ADDRESS>"
	// Transfer amount in MIST
	SendAmountMist = uint64(100000)
	// Default gas price (can be fetched from RPC if needed)
	GasPrice = uint64(5000)
	// BlockRz GRPC endpoint
	BlockRzGrpcUrl = "<YOUR_BLOCKRZ_GRPC_URL>"
	// Auth token header for your RPC
	AuthToken = "<YOUR_AUTH_TOKEN>"
	// Timeouts
	BuildTimeout = 5 * time.Second
	GrpcTimeout  = 15 * time.Second
)

// fetchLatestObjectRef fetches the latest (version, digest) for an objectId
func fetchLatestObjectRef(ctx context.Context, cli *sui.Client, objectId string) (*transaction.SuiObjectRef, error) {
	obj, err := cli.SuiGetObject(ctx, models.SuiGetObjectRequest{ObjectId: objectId})
	if err != nil {
		return nil, fmt.Errorf("SuiGetObject failed: %w", err)
	}
	if obj.Data == nil {
		return nil, fmt.Errorf("object not found or deleted: %s", objectId)
	}
	if obj.Data.Version == "" || obj.Data.Digest == "" {
		return nil, fmt.Errorf("invalid object data: id=%s version=%s digest=%s", objectId, obj.Data.Version, obj.Data.Digest)
	}

	ref, err := transaction.NewSuiObjectRef(
		models.SuiAddress(objectId),
		obj.Data.Version,
		models.ObjectDigest(obj.Data.Digest),
	)
	if err != nil {
		return nil, fmt.Errorf("NewSuiObjectRef failed: %w", err)
	}
	return ref, nil
}

// buildBaseTx creates a basic transfer tx: split from gas coin then transfer to receiver.
func buildBaseTx(cli *sui.Client, s *signer.Signer, gasRef *transaction.SuiObjectRef) *transaction.Transaction {
	tx := transaction.NewTransaction()
	tx.SetSuiClient(cli).
		SetSigner(s).
		SetSender(models.SuiAddress(s.Address)).
		SetGasPayment([]transaction.SuiObjectRef{*gasRef}).
		SetGasOwner(models.SuiAddress(s.Address))

	split := tx.SplitCoins(tx.Gas(), []transaction.Argument{tx.Pure(SendAmountMist)})
	tx.TransferObjects([]transaction.Argument{split}, tx.Pure(ReceiverAddr))
	return tx
}

// makeGrpcRequest converts transaction into gRPC ExecuteTransactionRequest
func makeGrpcRequest(ctx context.Context, tx *transaction.Transaction) (*pb.ExecuteTransactionRequest, []byte, error) {
	// Align with HTTP demo: use WaitForLocalExecution
	reqModel, err := tx.ToSuiExecuteTransactionBlockRequest(
		ctx,
		models.SuiTransactionBlockOptions{},
		"WaitForLocalExecution",
	)
	if err != nil {
		return nil, nil, fmt.Errorf("ToSuiExecuteTransactionBlockRequest failed: %w", err)
	}

	txBytes, err := base64.StdEncoding.DecodeString(reqModel.TxBytes)
	if err != nil {
		return nil, nil, fmt.Errorf("base64 decode TxBytes failed: %w", err)
	}

	if len(reqModel.Signature) == 0 {
		return nil, nil, fmt.Errorf("empty signature in reqModel")
	}

	sigBytes, err := base64.StdEncoding.DecodeString(reqModel.Signature[0])
	if err != nil {
		return nil, nil, fmt.Errorf("base64 decode signature failed: %w", err)
	}

	return &pb.ExecuteTransactionRequest{
		Transaction: &pb.Transaction{Bcs: &pb.Bcs{Value: txBytes}},
		Signatures:  []*pb.UserSignature{{Bcs: &pb.Bcs{Value: sigBytes}}},
	}, txBytes, nil
}

func main() {
	ctx := context.Background()
	// Build signer from secret key
	secretKey := "<YOUR_SECRET_KEY>"
	sender, err := signer.NewSignerWithSecretKey(secretKey)
	if err != nil {
		log.Fatalf("[INIT] NewSignerWithSecretKey failed: %v", err)
	}
	log.Printf("[INIT] sender=%s receiver=%s amountMist=%d", sender.Address, ReceiverAddr, SendAmountMist)

	// Create Sui client (official fullnode)
	cli := sui.NewSuiClient(OfficialRpcUrl).(*sui.Client)

	// Fetch latest gas object ref
	gasRef, err := fetchLatestObjectRef(ctx, cli, GasObjectId)
	if err != nil {
		log.Fatalf("[GAS] fetchLatestObjectRef failed: %v", err)
	}
	log.Printf("[GAS] gasObject=%s version=%d digest=%s", GasObjectId, gasRef.Version, gasRef.Digest)

	// Build base tx
	tx := buildBaseTx(cli, sender, gasRef)

	// ============================================
	//  Estimate fee & tip using dryRun
	// ============================================
	tx.SetGasPrice(GasPrice)
	buildCtx, cancel := context.WithTimeout(context.Background(), BuildTimeout)
	defer cancel()

	reqModel, err := tx.ToSuiExecuteTransactionBlockRequest(
		buildCtx,
		models.SuiTransactionBlockOptions{}, // dryRun no need showEffects
		"WaitForLocalExecution",
	)
	if err != nil {
		log.Fatalf("[PREP] build tx bytes failed: %v", err)
	}

	// Caculate Fee
	est, err := blockrzsdk.CalculateFeeFromTxB64(buildCtx, reqModel.TxBytes)
	if err != nil {
		log.Fatalf("[PREP] CalculateFeeFromTxB64 failed: %v", err)
	}
	tx.SetGasBudget(est.GasBudget)

	// Add tip into transaction
	// The required tip must exceed 1,000,000 mist
	// and must exceed 5% of the gas budget
	const minTip uint64 = 1000000
	tipFee := est.TipAmount
	if tipFee < minTip {
		tipFee = minTip
	}
	if err := blockrzsdk.AddTip(tx, tipFee); err != nil {
		log.Fatalf("[PREP] AddTip failed: %v", err)
	}
	log.Printf("[PREP] gasPrice=%d gasBudget=%d tip=%d txBytesLen=%d",
		GasPrice, est.GasBudget, tipFee, len(reqModel.TxBytes))

	// ============================================
	//  Build gRPC request and Send to BlockRz
	// ============================================
	conn, err := grpc.Dial(BlockRzGrpcUrl, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		log.Fatalf("[GRPC] dial failed: %v", err)
	}
	defer conn.Close()

	grpcClient := pb.NewTransactionExecutionServiceClient(conn)

	grpcCtx, cancel := context.WithTimeout(context.Background(), GrpcTimeout)
	defer cancel()

	grpcReq, txBytes, err := makeGrpcRequest(grpcCtx, tx)
	if err != nil {
		log.Fatalf("[GRPC] makeGrpcRequest failed: %v", err)
	}
	log.Printf("[GRPC][REQ] txBytesLen=%d sigCount=%d", len(txBytes), len(grpcReq.Signatures))

	// Attach auth token
	md := metadata.Pairs("auth_token", AuthToken)
	grpcCtx = metadata.NewOutgoingContext(grpcCtx, md)

	start := time.Now()
	resp, err := grpcClient.ExecuteTransaction(grpcCtx, grpcReq)
	if err != nil {
		log.Fatalf("[GRPC] ExecuteTransaction failed: %v", err)
	}

	log.Printf("[GRPC][RESP] cost=%s resp=%+v", time.Since(start), resp)
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.blockrazor.io/tc/transaction-submission/fast/sui/sui_executetransactionblock/go.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.