Public Mempool

Introduction

NewTxs is used to subscribe to the transaction data stream in the high-performance network.

Endpoint

Region	Availability Zone(AWS)	Relay Address
Frankfurt	euc1-az2	35.157.64.49:50051
Tokyo	apne1-az4	54.249.93.63:50051
Ireland	euw1-az1	3.248.65.151:50051
Virginia	use1-az4	52.205.173.134:50051

Rate Limit

	Tier 4	Tier 3	Tier 2	Tier 1	Tier 0
Parallel data streams	-	1	5	10	30

Request Parameters

Parameters	Mandatory	Format	Example	Description
NodeValidation	Mandatory	boolean	false	This field currently only supports being set to false, and the relay will push all new transactions (unchecked) with lower latency.

Request Example

https://github.com/BlockRazorinc/relay_example

Go

package main

import (
	"context"
	"fmt"

	// directory of the generated code using the provided relay.proto file
	pb "github.com/BlockRazorinc/relay_example/protobuf"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/rlp"
	"google.golang.org/grpc"
)

// auth will be used to verify the credential
type Authentication struct {
	apiKey string
}

func (a *Authentication) GetRequestMetadata(context.Context, ...string) (map[string]string, error) {
	return map[string]string{"apiKey": a.apiKey}, nil
}

func (a *Authentication) RequireTransportSecurity() bool {
	return false
}

func main() {

	// BlockRazor relay endpoint address
	blzrelayEndPoint := "ip:port"

	// auth will be used to verify the credential
	auth := Authentication{
		"your auth token",
	}

	// open gRPC connection to BlockRazor relay
	var err error
	conn, err := grpc.Dial(blzrelayEndPoint, grpc.WithInsecure(), grpc.WithPerRPCCredentials(&auth), grpc.WithWriteBufferSize(0), grpc.WithInitialConnWindowSize(128*1024))
	if err != nil {
		fmt.Println("error: ", err)
		return
	}

	// use the Gateway client connection interface
	client := pb.NewGatewayClient(conn)

	// create context and defer cancel of context
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// create a subscription using the stream-specific method and request
	stream, err := client.NewTxs(ctx, &pb.TxsRequest{NodeValidation: false})
	if err != nil {
		fmt.Println("failed to subscribe new tx: ", err)
		return
	}

	for {
		reply, err := stream.Recv()
		if err != nil {
			fmt.Println("stream receive error: ", err)
		}
		tx := &types.Transaction{}

		err = rlp.DecodeBytes(reply.Tx.RawTx, tx)
		if err != nil {
			continue
		}

		fmt.Println("recieve new tx, tx hash is ", tx.Hash().String())

	}
}

Proto

The code of relay.proto is as follows:

syntax = "proto3";

package blockchain;

option go_package = "/Users/code/relay/grpcServer"; 
service Gateway {
  rpc SendTx (SendTxRequest) returns (SendTxReply) {}
  rpc SendTxs (SendTxsRequest) returns (SendTxsReply) {}
  rpc NewTxs (TxsRequest) returns (stream TxsReply){}
  rpc NewBlocks (BlocksRequest) returns (stream BlocksReply){}
}

message TxsRequest{
  bool node_validation = 1;
}

message Tx{
  bytes from = 1;
  int64 timestamp = 2;
  bytes raw_tx = 3;
}

message TxsReply{
   Tx tx = 1;
}

message BlocksRequest{
  bool node_validation = 1;
}

message BlockHeader{
  string parent_hash = 1;
  string sha3_uncles = 2;
  string miner = 3;
  string state_root = 4;
  string transactions_root = 5;
  string receipts_root = 6;
  string logs_bloom = 7;
  string difficulty = 8;
  string number = 9;
  uint64 gas_limit = 10;
  uint64 gas_used = 11;
  uint64 timestamp = 12;
  bytes extra_data = 13;
  string mix_hash = 14;
  uint64 nonce = 15;
  uint64 base_fee_per_gas = 16;
  string withdrawals_root = 17;
  uint64 blob_gas_used = 18;
  uint64 excess_blob_gas = 19;
  string parent_beacon_block_root = 20;
}

message NextValidator{
  string block_height = 1;
  string coinbase = 2;
}

message BlocksReply{
  string hash = 1;
  BlockHeader header = 2;
  repeated NextValidator nextValidator = 3;
  repeated Tx txs = 4;
}

message Transaction {
  string content = 1;
}

message Transactions {
  repeated Transaction transactions = 1;
}

message SendTxRequest {
  string transaction = 1;
}

message SendTxsRequest {
  string transactions = 1;
}

message SendTxReply {
  string tx_hash = 1;
}

message SendTxsReply {
  repeated string tx_hashs = 1;
}

Response Example

Success

{
  "tx":[
     {
        "raw_tx":"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"
     }
   ]
}

Error

rpc error: code = Unknown desc = data streams have exceeded its max limit [5]