libsam/cmd/send_tx/main.go

package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"syscall"

	"github.com/gagliardetto/solana-go"
	"github.com/gagliardetto/solana-go/programs/system"
	"github.com/gagliardetto/solana-go/rpc"
	"github.com/samlior/libsam/pkg/consts"
	"github.com/samlior/libsam/pkg/enum"
	"github.com/samlior/libsam/pkg/swqos"
	"github.com/shopspring/decimal"
)

func main() {
	_privateKey := os.Getenv("PRIVATE_KEY")
	if _privateKey == "" {
		panic("PRIVATE_KEY is not set")
	}

	privateKey, err := solana.PrivateKeyFromBase58(_privateKey)
	if err != nil {
		panic(err)
	}

	rpcUrl := os.Getenv("RPC_URL")
	if rpcUrl == "" {
		panic("RPC_URL is not set")
	}

	exitSignal := make(chan os.Signal, 1)
	ctx, cancel := context.WithCancel(context.Background())
	signal.Notify(exitSignal, syscall.SIGINT, syscall.SIGTERM)

	go func() {
		<-exitSignal
		cancel()
	}()

	blockrazorClient, err := swqos.NewSWQoSClient(
		context.Background(),
		enum.SWQoSAgentBlockRazor,
		&swqos.SWQoSClientConfig{
			SendTxUrl: "frankfurt.solana-grpc.blockrazor.xyz:80",
		})
	if err != nil {
		panic(err)
	}

	amount, _ := decimal.NewFromString("0.001")
	amountUint64 := amount.Mul(decimal.New(1, consts.SolDecimals)).BigInt().Uint64()

	instructions := make([]solana.Instruction, 0)
	instructions = append(instructions, system.NewTransferInstruction(
		amountUint64,
		privateKey.PublicKey(),
		solana.MustPublicKeyFromBase58("EDi4rSy2LZgKJX74mbLTFk4mxoTgT6F7HxxzG2HBAFyK"), // blockrazor fee account
	).Build())

	client := rpc.New(rpcUrl)
	result, err := client.GetLatestBlockhash(ctx, rpc.CommitmentFinalized)
	if err != nil {
		panic(err)
	}

	tx, err := solana.NewTransaction(
		instructions,
		result.Value.Blockhash,
		solana.TransactionPayer(privateKey.PublicKey()),
	)
	if err != nil {
		panic(err)
	}

	// sign tx
	_, err = tx.Sign(func(key solana.PublicKey) *solana.PrivateKey {
		if privateKey.PublicKey().Equals(key) {
			return &privateKey
		}
		return nil
	})

	err = blockrazorClient.SendTransaction(ctx, tx)
	if err != nil {
		panic(err)
	}

	fmt.Println("Transaction sent successfully, tx hash:", tx.Signatures[0].String())
}