chore: add send tx example

cmd/send_tx/main.go

@@ -1,7 +1,93 @@
 package main
 
-import "fmt"
+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() {
-	fmt.Println("Hello, World!")
+	_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())
 }