tcp-gateway

High performance TCP Gateway base on Netty 4 ,for request data or push message.

Installation

Clone this repository, and add it as a dependent maven project.

Usage

Create a Tcp Server

Config spring-tcp-server.xml to start server

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                   http://www.springframework.org/schema/beans/spring-beans.xsd"
       default-autowire="byName">

    <!-- tcp server config start. -->
    <bean id="tcpServer" class="com.linkedkeeper.tcp.connector.tcp.server.TcpServer" init-method="init"
          destroy-method="shutdown">
        <!-- port is tcp server port -->
        <property name="port" value="2000"/>
    </bean>
    <bean id="tcpSessionManager" class="com.linkedkeeper.tcp.connector.tcp.TcpSessionManager">
        <property name="maxInactiveInterval" value="500"/>
        <!-- you can add listener to listen session event, include session create, destroy and so on. -->
        <property name="sessionListeners">
            <list>
                <ref bean="logSessionListener"/>
            </list>
        </property>
    </bean>
    <!-- logSessionListener is related tcpSessionManager, those listener should implements SessionListener -->
    <bean id="logSessionListener" class="com.linkedkeeper.tcp.connector.api.listener.LogSessionListener"/>
    <!-- tcp sender is a container that can send message to client from server -->
    <bean id="tcpSender" class="com.linkedkeeper.tcp.remoting.TcpSender">
        <constructor-arg ref="tcpConnector"/>
    </bean>
    <!-- server config is combine the config, don't modify -->
    <bean id="serverConfig" class="com.linkedkeeper.tcp.connector.tcp.config.ServerTransportConfig">
        <constructor-arg ref="tcpConnector"/>
        <constructor-arg ref="proxy"/>
        <constructor-arg ref="notify"/>
    </bean>
    <!-- tcp connector is container that manage the connection between server and client -->
    <bean id="tcpConnector" class="com.linkedkeeper.tcp.connector.tcp.TcpConnector" init-method="init"
          destroy-method="destroy"/>
    <!-- notify proxy is proxy that implement send notify to client -->
    <bean id="notify" class="com.linkedkeeper.tcp.notify.NotifyProxy">
        <constructor-arg ref="tcpConnector"/>
    </bean>
    <!-- default tcp server config end. -->

    <!-- this proxy is your proxy that can receive message from client -->
    <bean id="proxy" class="com.linkedkeeper.tcp.server.TestSimpleProxy"/>
</beans>

tcpServer: provide tcp connection service.
tcpSessionManager: you can add listener to listen session event, include session create, destroy and so on.
logSessionListener: it is related tcpSessionManager, those listener should implement SessionListener.
tcpSender: it is a container that can send message to client from server.
serverConfig: it is combine the config.
tcpConnector: it is container that manage the connection between server and client.
notifyProxy: it is proxy that implement send notify to client.

Above config is default, you don't have to change it. But you can change port.

Create Test Proxy to receive message from client

import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import com.linkedkeeper.tcp.connector.tcp.codec.MessageBuf;
import com.linkedkeeper.tcp.data.Login;
import com.linkedkeeper.tcp.data.Protocol;
import com.linkedkeeper.tcp.invoke.ApiProxy;
import com.linkedkeeper.tcp.message.MessageWrapper;
import com.linkedkeeper.tcp.message.SystemMessage;

public class TestSimpleProxy implements ApiProxy {

    public MessageWrapper invoke(SystemMessage sMsg, MessageBuf.JMTransfer message) {
        ByteString body = message.getBody();

        if (message.getCmd() == 1000) {
            try {
                Login.MessageBufPro.MessageReq messageReq = Login.MessageBufPro.MessageReq.parseFrom(body);
                if (messageReq.getCmd().equals(Login.MessageBufPro.CMD.CONNECT)) {
                    return new MessageWrapper(MessageWrapper.MessageProtocol.CONNECT, message.getToken(), null);
                }
            } catch (InvalidProtocolBufferException e) {
                e.printStackTrace();
            }
        } else if (message.getCmd() == 1002) {
            try {
                Login.MessageBufPro.MessageReq messageReq = Login.MessageBufPro.MessageReq.parseFrom(body);
                if (messageReq.getCmd().equals(Login.MessageBufPro.CMD.HEARTBEAT)) {
                    MessageBuf.JMTransfer.Builder resp = Protocol.generateHeartbeat();
                    return new MessageWrapper(MessageWrapper.MessageProtocol.HEART_BEAT, message.getToken(), resp);
                }
            } catch (InvalidProtocolBufferException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

Input Parameters:

SystemMessage: the message get from tcp server, include remoteAddress, localAddress.
MessageBuf.JMTransfer: this is important, this class is created by protobuf, it include header and body, header is app information, you can get the detail from this project.
Output Parameter:
MessageWrapper: it is message response wrapper. It include protocol, sessionId and body. Body is response data. body is byte type, and it also a protobuf bytes.
Send Notify to Client
```
private NotifyProxy notify;
```

final int timeout = 10 * 1000; final int NOTIFY = 3;

public boolean send(long seq, String sessionId, int cmd, ByteString body) throws Exception { boolean success = false; MessageBuf.JMTransfer.Builder builder = generateNotify(sessionId, seq, cmd, body); if (builder != null) { MessageWrapper wrapper = new MessageWrapper(MessageWrapper.MessageProtocol.NOTIFY, sessionId, builder); int ret = notify.notify(seq, wrapper, timeout); if (ret == Constants.NOTIFY_SUCCESS) { success = true; } else if (ret == Constants.NOTIFY_NO_SESSION) { / no session on this machine / success = true; } } else { / no session in the cache / success = true; } return success; }

/**

session */ final String VERSION = "version"; final String DEVICE_ID = "deviceId"; final String PLATFORM = "platform"; final String PLATFORM_VERSION = "platformVersion"; final String TOKEN = "token"; final String APP_KEY = "appKey"; final String TIMESTAMP = "timestamp"; final String SIGN = "sign";

/**

need session into redis, then when you notify you can get info from redis by session */ final Map<String, Map<String, Object>> testSessionMap = null;

protected MessageBuf.JMTransfer.Builder generateNotify(String sessionId, long seq, int cmd, ByteString body) throws Exception { Map<String, Object> map = testSessionMap.get(sessionId);

MessageBuf.JMTransfer.Builder builder = MessageBuf.JMTransfer.newBuilder();
builder.setVersion(String.valueOf(map.get(VERSION)));
builder.setDeviceId(String.valueOf(map.get(DEVICE_ID)));
builder.setCmd(cmd);
builder.setSeq(seq);
builder.setFormat(NOTIFY);
builder.setFlag(0);
builder.setPlatform(String.valueOf(map.get(PLATFORM)));
builder.setPlatformVersion(String.valueOf(map.get(PLATFORM_VERSION)));
builder.setToken(String.valueOf(map.get(TOKEN)));
builder.setAppKey(String.valueOf(map.get(APP_KEY)));
builder.setTimeStamp(String.valueOf(map.get(TIMESTAMP)));
builder.setSign(String.valueOf(map.get(SIGN)));
builder.setBody(body);

return builder;

}

## Tcp Client 
support iOS, android, C++ languages 
### Serialize protobuf
#### java
```bat 
/protobuf/protoc --proto_path=/protobuf/ --java_out=/protobuf/MessageBuf.proto

object-c

protoc --plugin=/protobuf/protoc-gen-objc MessageBuf.proto --object_out="/protobuf/"

Notes. You can add QQ group to download protobuf compiler