Added second listener to server and rewrote client in go.

3 files changed, 167 insertions, 73 deletions

diff --git a/server/go.mod b/server/go.mod
new file mode 100644
index 0000000..1aa1135
--- /dev/null
+++ b/server/go.mod
@@ -0,0 +1,3 @@
+module vasthecat.ru/coursework-server
+
+go 1.16
diff --git a/server/main.go b/server/main.go
index 7c67ead..e7f47fc 100644
--- a/server/main.go
+++ b/server/main.go
@@ -4,71 +4,9 @@ import (
 	"encoding/json"
 	"log"
 	"net"
+	"sync"
 )
 
-const (
-	MESSAGE      = "message"
-	AUTHENTICATE = "authenticate"
-	RENAME       = "rename"
-)
-
-const (
-	SUCCESS = "success"
-	FAILURE = "failure"
-)
-
-type Message struct {
-	Type string
-	Data string
-	User string
-}
-
-type Response struct {
-	Status string
-	Data   string
-}
-
-func parseMessage(data []byte) Message {
-	var m Message
-	// TODO(andrew): Добавить обработку ошибок
-	json.Unmarshal(data, &m)
-	return m
-}
-
-func toBytes(num uint32) []byte {
-	buf := make([]byte, 4)
-	var mask uint32 = 0x00FF
-	for i := 0; i < 4; i += 1 {
-		buf[4-i-1] = byte(num & mask)
-		num >>= 8
-	}
-	return buf
-}
-
-func fromBytes(data []byte) uint32 {
-	var num uint32
-	for i := 0; i < 4; i += 1 {
-		num += uint32(data[i] << ((4 - i - 1) * 8))
-	}
-	return num
-}
-
-func sendMessage(conn net.Conn, message []byte) error {
-	size := uint32(len(message))
-
-	_, err := conn.Write(toBytes(size))
-	if err != nil {
-		return err
-	}
-
-	_, err = conn.Write(message)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
 func handleConnection(conn net.Conn) {
 	defer conn.Close()
 
@@ -77,7 +15,7 @@ func handleConnection(conn net.Conn) {
 	maxAuthAttempts := 5
 	authAttempts := 0
 	authenticated := false
-	buf := make([]byte, 256)
+	buf := make([]byte, 4096)
 
 	for {
 		if authAttempts >= maxAuthAttempts {
@@ -108,12 +46,23 @@ func handleConnection(conn net.Conn) {
 
 		rawMessage := buf[4 : size+4]
 		message := parseMessage(rawMessage)
-		//fmt.Println(message.Data)
 		if message.Type == AUTHENTICATE {
 			// TODO(andrew): Добавить процесс аутентификации
 			if true {
 				authenticated = true
+				resp, _ := json.Marshal(Response{
+					Status: SUCCESS,
+					Data:   "Аутентификация прошла успешно",
+				})
+				_ = sendMessage(conn, resp)
+			} else {
+				resp, _ := json.Marshal(Response{
+					Status: FAILURE,
+					Data:   "При аутентификации произошла ошибка",
+				})
+				_ = sendMessage(conn, resp)
 			}
+			continue
 		}
 
 		if !authenticated {
@@ -146,19 +95,91 @@ func handleConnection(conn net.Conn) {
 	}
 }
 
+func reader(c chan Message) {
+	const maxMessages uint64 = 1024
+	var count uint64 = 0
+	for {
+		data := <-c
+
+		received.Lock()
+		if count >= maxMessages {
+			received.data = []Message{data}
+			received.messageShift += maxMessages
+		} else {
+			received.data = append(received.data, data)
+			count += 1
+		}
+		received.Unlock()
+	}
+}
+
+func handleSender(conn net.Conn) {
+	received.Lock()
+	lastIndex := received.messageShift
+	received.Unlock()
+
+	for {
+		var message Message
+		received.Lock()
+		idx := lastIndex - received.messageShift
+		if idx <= uint64(len(received.data)) {
+			message = received.data[idx]
+		}
+		received.Lock()
+
+		resp, _ := json.Marshal(Response{
+			Status: SUCCESS,
+			Data:   message.serialize(),
+		})
+		_ = sendMessage(conn, resp)
+	}
+}
+
+var received struct {
+	sync.Mutex
+	data         []Message
+	messageShift uint64
+}
+
 func main() {
+	var wg sync.WaitGroup
+
+	c := make(chan Message)
+	go reader(c)
+
 	sock, err := net.Listen("tcp", "localhost:8080")
-	defer sock.Close()
 	handleError(err)
+	defer sock.Close()
+	wg.Add(1)
+	go func(sock net.Listener) {
+		for {
+			conn, err := sock.Accept()
+			if err == nil {
+				go handleConnection(conn)
+			} else {
+				break
+			}
+		}
+		wg.Done()
+	}(sock)
 
-	for {
-		conn, err := sock.Accept()
-		if err == nil {
-			go handleConnection(conn)
-		} else {
-			handleError(err)
+	senderSock, err := net.Listen("tcp", "localhost:8081")
+	handleError(err)
+	defer senderSock.Close()
+	wg.Add(1)
+	go func(sock net.Listener) {
+		for {
+			conn, err := sock.Accept()
+			if err == nil {
+				go handleSender(conn)
+			} else {
+				break
+			}
 		}
-	}
+		wg.Done()
+	}(senderSock)
+
+	wg.Wait()
 }
 
 func handleError(err error) {
diff --git a/server/utils.go b/server/utils.go
new file mode 100644
index 0000000..cd2069f
--- /dev/null
+++ b/server/utils.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+	"encoding/json"
+	"net"
+)
+
+const (
+	MESSAGE      = "message"
+	AUTHENTICATE = "authenticate"
+	RENAME       = "rename"
+)
+
+const (
+	SUCCESS = "success"
+	FAILURE = "failure"
+)
+
+type Message struct {
+	Type string
+	Data string
+	User string
+}
+
+func (msg *Message) serialize() string {
+	data, _ := json.Marshal(msg)
+	return string(data)
+}
+
+type Response struct {
+	Status string
+	Data   string
+}
+
+func toBytes(num uint32) []byte {
+	buf := make([]byte, 4)
+	var mask uint32 = 0x00FF
+	for i := 0; i < 4; i += 1 {
+		buf[4-i-1] = byte(num & mask)
+		num >>= 8
+	}
+	return buf
+}
+
+func fromBytes(data []byte) uint32 {
+	var num uint32
+	for i := 0; i < 4; i += 1 {
+		num += uint32(data[i] << ((4 - i - 1) * 8))
+	}
+	return num
+}
+
+func sendMessage(conn net.Conn, message []byte) error {
+	size := uint32(len(message))
+
+	data := append(toBytes(size), message...)
+	_, err := conn.Write(data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func parseMessage(data []byte) Message {
+	var m Message
+	// TODO(andrew): Добавить обработку ошибок
+	json.Unmarshal(data, &m)
+	return m
+}