Send workers, Batch/AES encryption

internal/client/client.go

@@ -62,6 +62,7 @@ func (c *Client) Run(ctx context.Context) error {
 	}()
 
 	var wg sync.WaitGroup
+	c.startSendWorkers(ctx, &wg)
 	defer wg.Wait()
 
 	for {

internal/client/sender_workers.go

@@ -0,0 +1,204 @@
+// ==============================================================================
+// MasterHttpRelayVPN
+// Author: MasterkinG32
+// Github: https://github.com/masterking32
+// Year: 2026
+// ==============================================================================
+package client
+
+import (
+	"bytes"
+	"context"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+
+	"masterhttprelayvpn/internal/protocol"
+)
+
+type sendWorker struct {
+	id         int
+	httpClient *http.Client
+}
+
+type dequeuedPacket struct {
+	socksConn *SOCKSConnection
+	item      *SOCKSOutboundQueueItem
+}
+
+func (c *Client) startSendWorkers(ctx context.Context, wg *sync.WaitGroup) {
+	for i := 0; i < c.cfg.WorkerCount; i++ {
+		worker := &sendWorker{
+			id: i + 1,
+			httpClient: &http.Client{
+				Timeout: time.Duration(c.cfg.HTTPRequestTimeoutMS) * time.Millisecond,
+			},
+		}
+
+		wg.Add(1)
+		go func(w *sendWorker) {
+			defer wg.Done()
+			w.run(ctx, c)
+		}(worker)
+	}
+}
+
+func (w *sendWorker) run(ctx context.Context, c *Client) {
+	pollInterval := time.Duration(c.cfg.WorkerPollIntervalMS) * time.Millisecond
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+		}
+
+		batch, selected := c.buildNextBatch()
+		if len(selected) == 0 {
+			time.Sleep(pollInterval)
+			continue
+		}
+
+		if err := batch.Validate(); err != nil {
+			c.log.Errorf("<red>worker=<cyan>%d</cyan> invalid batch: <cyan>%v</cyan></red>", w.id, err)
+			c.requeueSelected(selected)
+			time.Sleep(pollInterval)
+			continue
+		}
+
+		body, err := encryptBatch(batch, c.cfg.AESEncryptionKey)
+		if err != nil {
+			c.log.Errorf("<red>worker=<cyan>%d</cyan> encrypt batch failed: <cyan>%v</cyan></red>", w.id, err)
+			c.requeueSelected(selected)
+			time.Sleep(pollInterval)
+			continue
+		}
+
+		if err := w.postBatch(ctx, c, batch, body); err != nil {
+			c.log.Warnf("<yellow>worker=<cyan>%d</cyan> send failed for batch=<cyan>%s</cyan>: <cyan>%v</cyan></yellow>", w.id, batch.BatchID, err)
+			c.requeueSelected(selected)
+			time.Sleep(pollInterval)
+			continue
+		}
+
+		c.log.Debugf(
+			"<green>worker=<cyan>%d</cyan> sent batch=<cyan>%s</cyan> packets=<cyan>%d</cyan> bytes=<cyan>%d</cyan></green>",
+			w.id, batch.BatchID, len(batch.Packets), len(body),
+		)
+	}
+}
+
+func (c *Client) buildNextBatch() (protocol.Batch, []dequeuedPacket) {
+	connections := c.socksConnections.Snapshot()
+	selected := make([]dequeuedPacket, 0, c.cfg.MaxPacketsPerBatch)
+	packets := make([]protocol.Packet, 0, c.cfg.MaxPacketsPerBatch)
+	totalBytes := 0
+
+	for len(selected) < c.cfg.MaxPacketsPerBatch {
+		progress := false
+
+		for _, socksConn := range connections {
+			if len(selected) >= c.cfg.MaxPacketsPerBatch {
+				break
+			}
+
+			item := socksConn.DequeuePacket()
+			if item == nil {
+				continue
+			}
+
+			packetBytes := len(item.Packet.Payload)
+			if len(selected) > 0 && totalBytes+packetBytes > c.cfg.MaxBatchBytes {
+				socksConn.RequeueFront([]*SOCKSOutboundQueueItem{item})
+				continue
+			}
+
+			selected = append(selected, dequeuedPacket{
+				socksConn: socksConn,
+				item:      item,
+			})
+			packets = append(packets, item.Packet)
+			totalBytes += packetBytes
+			progress = true
+		}
+
+		if !progress {
+			break
+		}
+	}
+
+	if len(packets) == 0 {
+		return protocol.Batch{}, nil
+	}
+
+	batch := protocol.NewBatch(c.clientSessionKey, protocol.NewBatchID(), packets)
+	return batch, selected
+}
+
+func (c *Client) requeueSelected(selected []dequeuedPacket) {
+	grouped := make(map[*SOCKSConnection][]*SOCKSOutboundQueueItem)
+	for _, entry := range selected {
+		grouped[entry.socksConn] = append(grouped[entry.socksConn], entry.item)
+	}
+
+	for socksConn, items := range grouped {
+		socksConn.RequeueFront(items)
+	}
+}
+
+func (w *sendWorker) postBatch(ctx context.Context, c *Client, batch protocol.Batch, body []byte) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.cfg.RelayURL, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/octet-stream")
+	req.Header.Set("X-Relay-Version", fmt.Sprintf("%d", protocol.CurrentVersion))
+
+	resp, err := w.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
+		return fmt.Errorf("unexpected status %d: %s", resp.StatusCode, string(respBody))
+	}
+
+	_, _ = io.Copy(io.Discard, resp.Body)
+	return nil
+}
+
+func encryptBatch(batch protocol.Batch, keyText string) ([]byte, error) {
+	plain, err := json.Marshal(batch)
+	if err != nil {
+		return nil, err
+	}
+
+	key := sha256.Sum256([]byte(keyText))
+	block, err := aes.NewCipher(key[:])
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := rand.Read(nonce); err != nil {
+		return nil, err
+	}
+
+	ciphertext := gcm.Seal(nil, nonce, plain, nil)
+	return append(nonce, ciphertext...), nil
+}

internal/client/session.go

@@ -81,3 +81,14 @@ func (s *SOCKSConnectionStore) Delete(id uint64) {
 	delete(s.items, id)
 	s.mu.Unlock()
 }
+
+func (s *SOCKSConnectionStore) Snapshot() []*SOCKSConnection {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	items := make([]*SOCKSConnection, 0, len(s.items))
+	for _, item := range s.items {
+		items = append(items, item)
+	}
+	return items
+}

internal/client/socks_queue.go

@@ -97,6 +97,44 @@ func (s *SOCKSConnection) QueueSnapshot() (items int, bytes int) {
 	return len(s.OutboundQueue), s.QueuedBytes
 }
 
+func (s *SOCKSConnection) DequeuePacket() *SOCKSOutboundQueueItem {
+	s.queueMu.Lock()
+	defer s.queueMu.Unlock()
+
+	if len(s.OutboundQueue) == 0 {
+		return nil
+	}
+
+	item := s.OutboundQueue[0]
+	s.OutboundQueue[0] = nil
+	s.OutboundQueue = s.OutboundQueue[1:]
+	s.QueuedBytes -= item.PayloadSize
+	if s.QueuedBytes < 0 {
+		s.QueuedBytes = 0
+	}
+	return item
+}
+
+func (s *SOCKSConnection) RequeueFront(items []*SOCKSOutboundQueueItem) {
+	if len(items) == 0 {
+		return
+	}
+
+	s.queueMu.Lock()
+	defer s.queueMu.Unlock()
+
+	front := make([]*SOCKSOutboundQueueItem, 0, len(items)+len(s.OutboundQueue))
+	for _, item := range items {
+		if item == nil {
+			continue
+		}
+		front = append(front, item)
+		s.QueuedBytes += item.PayloadSize
+	}
+	front = append(front, s.OutboundQueue...)
+	s.OutboundQueue = front
+}
+
 func splitPayloadChunks(payload []byte, maxChunkSize int) [][]byte {
 	if len(payload) == 0 || maxChunkSize <= 0 {
 		return nil