chore: add swqos client

pkg/swqos/clients/next_block_http_client.go

@@ -0,0 +1,90 @@
+package clients
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/gagliardetto/solana-go"
+)
+
+type NextBlockSendTransactionRequest struct {
+	Transaction struct {
+		Content string `json:"content"`
+	} `json:"transaction"`
+}
+
+type NextBlockHttpClient struct {
+	sendTxUrl string
+
+	client *http.Client
+}
+
+func NewNextBlockHttpClient(sendTxUrl string) *NextBlockHttpClient {
+	// create custom transport with keep-alive enabled
+	transport := &http.Transport{
+		MaxIdleConns:        100,
+		MaxIdleConnsPerHost: 10,
+		IdleConnTimeout:     65 * time.Second,
+		DisableKeepAlives:   false, // enable keep-alive
+	}
+
+	client := &http.Client{
+		Transport: transport,
+		Timeout:   30 * time.Second,
+	}
+
+	return &NextBlockHttpClient{
+		sendTxUrl: sendTxUrl,
+		client:    client,
+	}
+}
+
+func (c *NextBlockHttpClient) SendTransaction(ctx context.Context, tx *solana.Transaction) error {
+	request := NextBlockSendTransactionRequest{
+		Transaction: struct {
+			Content string `json:"content"`
+		}{
+			Content: tx.MustToBase64(),
+		},
+	}
+
+	jsonData, err := json.Marshal(request)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.sendTxUrl, bytes.NewReader(jsonData))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "trial1759030481-pveRwfZNuyvrnrqvx7Lz559s9tR51pt7%2B1Sbv32wgcM%3D")
+
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("status code: %d, body: %s", resp.StatusCode, string(body))
+	}
+
+	return nil
+}
+
+func (c *NextBlockHttpClient) SendBundle(ctx context.Context, txs []*solana.Transaction) error {
+	return fmt.Errorf("next block http client not support send bundle")
+}