netty-websocket-spring-boot-starter

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About

netty-websocket-spring-boot-starter will help you develop WebSocket server by using Netty in spring-boot,it is easy to develop by using annotation like spring-websocket

Requirement

• jdk version 1.8 or 1.8+
• spring-boot version 2.0.0.RELEASE or over 2.0.0.RELEASE

Quick Start

• add Dependencies:

	<dependency>
		<groupId>org.yeauty</groupId>
		<artifactId>netty-websocket-spring-boot-starter</artifactId>
		<version>0.6.2</version>
	</dependency>

• construct a ServerEndpointExporter instance to Spring container to start the WebSocket. e.g.

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

• annotate @ServerEndpoint、@Component on endpoint class，and annotate @OnOpen、@OnClose、@OnError、@OnMessage、@OnBinary、OnEvent on the method. e.g.

@ServerEndpoint
@Component
public class MyWebSocket {

    @OnOpen
    public void onOpen(Session session, HttpHeaders headers) throws IOException {
        System.out.println("new connection");
    }

    @OnClose
    public void onClose(Session session) throws IOException {
       System.out.println("one connection closed"); 
    }

    @OnError
    public void onError(Session session, Throwable throwable) {
        throwable.printStackTrace();
    }

    @OnMessage
    public void OnMessage(Session session, String message) {
        System.out.println(message);
        session.sendText("Hello Netty!");
    }

    @OnBinary
    public void OnBinary(Session session, byte[] bytes) {
        for (byte b : bytes) {
            System.out.println(b);
        }
        session.sendBinary(bytes); 
    }

    @OnEvent
    public void onEvent(Session session, Object evt) {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent idleStateEvent = (IdleStateEvent) evt;
            switch (idleStateEvent.state()) {
                case READER_IDLE:
                    System.out.println(“read idle”);
                    break;
                case WRITER_IDLE:
                    System.out.println(“write idle”);
                    break;
                case ALL_IDLE:
                    System.out.println(“all idle”);
                    break;
                default:
                    break;
            }
        }
    }

}

• use Websocket client to connect ws://127.0.0.1:80

Annotation

@ServerEndpoint

declaring ServerEndpointExporter in Spring configuration,it will scan for WebSocket endpoints that tated with ServerEndpoint . beans that be annotated with ServerEndpoint will be registered as a WebSocket endpoint. all configurations are inside this annotation ( e.g. @ServerEndpoint("/ws") )

@OnOpen

when there is a WebSocket connection accepted,the method annotated with @OnOpen will be called
classes which be injected to the method are:Session、HttpHeaders

@OnClose

when a WebSocket connection closed,the method annotated with @OnClose will be called classes which be injected to the method are:Session

@OnError

when a WebSocket connection throw Throwable, the method annotated with @OnError will be called classes which be injected to the method are:Session、Throwable

@OnMessage

when a WebSocket connection received a message,the method annotated with @OnMessage will be called classes which be injected to the method are:Session、String

@OnBinary

when a WebSocket connection received the binary,the method annotated with @OnBinary will be called classes which be injected to the method are:Session、byte[]

@OnEvent

when a WebSocket connection received the event of Netty,the method annotated with @OnEvent will be called classes which be injected to the method are:Session、Object

Configuration

all configurations are configured in @ServerEndpoint's property

property	default	description
path	"/"	path of WebSocket can be aliased for value
host	"0.0.0.0"	host of WebSocket."0.0.0.0" means all of local addresses
port	80	port of WebSocket。if the port equals to 0，it will use a random and available port(to get the port Multi-Endpoint)
prefix	""	configuration by application.properties when it is empty，details can be find in Configuration-by-application.properties
optionConnectTimeoutMillis	30000	the same as ChannelOption.CONNECT_TIMEOUT_MILLIS in Netty
optionSoBacklog	128	the same as ChannelOption.SO_BACKLOG in Netty
childOptionWriteSpinCount	16	the same as ChannelOption.WRITE_SPIN_COUNT in Netty
childOptionWriteBufferHighWaterMark	64*1024	the same as ChannelOption.WRITE_BUFFER_HIGH_WATER_MARK in Netty,but use ChannelOption.WRITE_BUFFER_WATER_MARK in fact.
childOptionWriteBufferLowWaterMark	32*1024	the same as ChannelOption.WRITE_BUFFER_LOW_WATER_MARK in Netty,but use ChannelOption.WRITE_BUFFER_WATER_MARK in fact.
childOptionSoRcvbuf	-1(mean not set)	the same as ChannelOption.SO_RCVBUF in Netty
childOptionSoSndbuf	-1(mean not set)	the same as ChannelOption.SO_SNDBUF in Netty
childOptionTcpNodelay	true	the same as ChannelOption.TCP_NODELAY in Netty
childOptionSoKeepalive	false	the same as ChannelOption.SO_KEEPALIVE in Netty
childOptionSoLinger	-1	the same as ChannelOption.SO_LINGER in Netty
childOptionAllowHalfClosure	false	the same as ChannelOption.ALLOW_HALF_CLOSURE in Netty
readerIdleTimeSeconds	0	the same as readerIdleTimeSeconds in IdleStateHandler and add IdleStateHandler to pipeline when it is not 0
writerIdleTimeSeconds	0	the same as writerIdleTimeSeconds in IdleStateHandler and add IdleStateHandler to pipeline when it is not 0
allIdleTimeSeconds	0	the same as allIdleTimeSeconds in IdleStateHandler and add IdleStateHandler to pipeline when it is not 0

Configuration by application.properties

After setting prefix in @ServerEndpoint, then configurate by application.properties. for example：

• first,set prefix

@ServerEndpoint(prefix = "netty-websocket")
@Component
public class MyWebSocket {
    ...
}

• then configurate in application.properties

netty-websocket.host=0.0.0.0
netty-websocket.path=/
netty-websocket.port=80

The mapping of the key of application.properties and properties in @ServerEndpoint,following:

properties in @ServerEndpoint	key of application.properties	example
path	{prefix}.path	netty-websocket.path
host	{prefix}.host	netty-websocket.host
port	{prefix}.port	netty-websocket.port
optionConnectTimeoutMillis	{prefix}.option.connect-timeout-millis	netty-websocket.option.connect-timeout-millis
optionSoBacklog	{prefix}.option.so-backlog	netty-websocket.option.so-backlog
childOptionWriteSpinCount	{prefix}.child-option.write-spin-count	netty-websocket.child-option.write-spin-count
childOptionWriteBufferHighWaterMark	{prefix}.child-option.write-buffer-high-water-mark	netty-websocket.child-option.write-buffer-high-water-mark
childOptionWriteBufferLowWaterMark	{prefix}.child-option.write-buffer-low-water-mark	netty-websocket.child-option.write-buffer-low-water-mark
childOptionSoRcvbuf	{prefix}.child-option.so-rcvbuf	netty-websocket.child-option.so-rcvbuf
childOptionSoSndbuf	{prefix}.child-option.so-sndbuf	netty-websocket.child-option.so-sndbuf
childOptionTcpNodelay	{prefix}.child-option.tcp-nodelay	netty-websocket.child-option.tcp-nodelay
childOptionSoKeepalive	{prefix}.child-option.so-keepalive	netty-websocket.child-option.so-keepalive
childOptionSoLinger	{prefix}.child-option.so-linger	netty-websocket.child-option.so-linger
childOptionAllowHalfClosure	{prefix}.child-option.allow-half-closure	netty-websocket.child-option.allow-half-closure
readerIdleTimeSeconds	{prefix}.reader-idle-time-seconds	netty-websocket.reader-idle-time-seconds
writerIdleTimeSeconds	{prefix}.writer-idle-time-seconds	netty-websocket.writer-idle-time-seconds
allIdleTimeSeconds	{prefix}.all-idle-time-seconds	netty-websocket.all-idle-time-seconds

Custom Favicon

The way of configure favicon is the same as spring-boot.If favicon.ico is presented in the root of the classpath,it will be automatically used as the favicon of the application.the example is following:

src/
  +- main/
      +- java/
      |   + <source code>
      +- resources/
          +- favicon.ico

Custom Error Pages

The way of configure favicon is the same as spring-boot.you can add a file to an /public/error folder.The name of the error page should be the exact status code or a series mask.the example is following:

src/
  +- main/
      +- java/
      |   + <source code>
      +- resources/
          +- public/
              +- error/
              |   +- 404.html
              |   +- 5xx.html
              +- <other public assets>

Multi Endpoint

• base on Quick-Start,use annotation @ServerEndpoint and @Component in classes which hope to become a endpoint.
• you can get all socket addresses in ServerEndpointExporter.getInetSocketAddressSet().
• when there are different addresses(different host or different port) in WebSocket,they will use different ServerBootstrap instance.
• when the addresses are the same,but path is different,they will use the same ServerBootstrap instance.
• when multiple port of endpoint is 0 ,they will use the same random port
• when multiple port of endpoint is the same as the path,host can't be set as "0.0.0.0",because it means it binds all of the addresses