# gRPC

### 介紹

BlockRazor RPC已支持基於gRPC協議發送請求(包括標準化JSON RPC、`sendMevBundle`和`Query TxProcessStatus`) 相比HTTPS協議可降低通信延遲和計算開銷，進一步提升交易上鏈速度和競拍勝率。目前支持向BlockRazor RPC的BSC节点发送gRPC请求。

### 訂閱計劃

| Tier 4 | Tier 3 | Tier 2 | Tier 1 | Tier 0 |
| ------ | ------ | ------ | ------ | ------ |
| -      | -      | -      | ✅      | ✅      |

### 端點

gRPC端點域名獲取步驟如下：

1. [註冊](https://www.blockrazor.io/#/register)BlockRazor
2. [登錄](https://www.blockrazor.io/#/login)控制台，前往【RPC】模塊，選擇BSC，點擊【更新】

<figure><img src="/files/JGXEtXauGNPWjNaYGcXm" alt="" width="563"><figcaption></figcaption></figure>

3. 在HTTPS URL中輸入自定義的三級域名，gRPC的三級域名會聯動更新
4. 點擊確認後更新自定義URL，複製gRPC URL

### 请求示例

```go
package main

import (
	"context"
	"crypto/tls"
	"encoding/json"
	"fmt"
	pb "github.com/easydo666/geth-grpc/rpc"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	"log"
	"math/big"
)

var From string = "0xSomePublicAddress12439439c739036a7660ec1"
var PrivateKey string = "your from address's privateKey"
var To string = "0xSomePublicAddress12439439c739036a7660ec2"
var gRPCEndpoint string = "gRPC url" // get gRPC URL from portal

func main() {
	// 1. create a new gRPC client connection
	conn, err := grpc.NewClient(gRPCEndpoint, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
	if err != nil {
		log.Fatalf("failed to connect: %v", err)
	}
	defer conn.Close()
	client := pb.NewJsonRpcServiceClient(conn)

	// 2. construct the JSON-RPC request and obtain the nonce
	var params []string = []string{From, "pending"}
	b, _ := json.Marshal(params)

	req := &pb.JsonRpcRequest{
		Jsonrpc: "2.0",
		Method:  "eth_getTransactionCount",
		Params:  string(b),
		Id:      "1",
	}

	jsonRpc, err := client.CallJsonRpc(context.Background(), req)
	if err != nil || jsonRpc.GetError() != "" {
		if err != nil {
			fmt.Println(err)
		} else {
			fmt.Println(jsonRpc.GetError())
		}
	}
	var nonce hexutil.Uint64
	err = json.Unmarshal([]byte(jsonRpc.GetResult()), &nonce)

	// 3. construct the JSON-RPC request and send the transaction
	to := common.HexToAddress(To)
	tx := types.NewTx(&types.LegacyTx{Nonce: uint64(nonce), GasPrice: big.NewInt(1e8), Gas: 21000, To: &to, Value: big.NewInt(0)})

	privateKey, err := crypto.HexToECDSA(PrivateKey)
	if err != nil {
		log.Fatal(err)
	}
	signedTx, err := types.SignTx(tx, types.NewEIP155Signer(big.NewInt(56)), privateKey)
	if err != nil {
		log.Fatal(err)
	}
	binary, _ := signedTx.MarshalBinary()
	encode := hexutil.Encode(binary)

	b, _ = json.Marshal([]string{encode})
	req = &pb.JsonRpcRequest{
		Jsonrpc: "2.0",
		Method:  "eth_sendRawTransaction",
		Params:  string(b),
		Id:      "1",
	}

	res, err := client.CallJsonRpc(context.Background(), req)
	if err != nil || res.GetError() != "" {
		if err != nil {
			fmt.Println(err)
		} else {
			fmt.Println(res.GetError())
		}
	}
	fmt.Println(res.GetResult())
}
```


---

# 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/rpc/bsc/grpc.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.