Subscribe NewTxs

Introduction

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

Rate Limit

	Tier 3	Tier 2	Tier 1
Parallel data streams	-	5	10

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

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())

	}
}

Response Example

Success

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

Error

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