motan學習筆記 四 motan Demo 之yar 分析_dubbo

motan學習筆記 一 微博輕量級RPC架構Motan

motan學習筆記 二 motan架構分析

motan學習筆記 三 motan Demo 分析

motan學習筆記 四 motan Demo 之yar 分析

motan學習筆記 五 opentracing學習入門

motan學習筆記 六 opentracing Brave+zipkin實現

發現了yar 這個東西， motan新增了 YarRpcProtocol 這個協議，主要支援php序列化。

來學習下yar協議的具體實現

從代碼中看出，支援exporter，不支援refer 因為其走的http協議，所以php直接rest方式調用就行

@SpiMeta(name = "yar")public class YarRpcProtocol extends AbstractProtocol {    private ConcurrentHashMap<String, ProviderMessageRouter> ipPort2RequestRouter = new ConcurrentHashMap<String, ProviderMessageRouter>();    @Override    protected <T> Exporter<T> createExporter(Provider<T> provider, URL url) {                return new YarExporter<T>(url, provider, this);    }    @Override    protected <T> Referer<T> createReferer(Class<T> clz, URL url, URL serviceUrl) {        //TODO        throw new MotanFrameworkException("not yet implemented!");    }    public ProviderMessageRouter initRequestRouter(URL url, Provider<?> provider) {        String ipPort = url.getServerPortStr();        ProviderMessageRouter requestRouter = ipPort2RequestRouter.get(ipPort);        if (requestRouter == null) {            ipPort2RequestRouter.putIfAbsent(ipPort, new YarMessageRouter());            requestRouter = ipPort2RequestRouter.get(ipPort);        }        requestRouter.addProvider(provider);        return requestRouter;    }        public void unexport(URL url, Provider<?> provider){        String protocolKey = MotanFrameworkUtil.getProtocolKey(url);        String ipPort = url.getServerPortStr();        Exporter<?> exporter = (Exporter<?>) exporterMap.remove(protocolKey);        if (exporter != null) {            exporter.destroy();        }        synchronized (ipPort2RequestRouter) {            ProviderMessageRouter requestRouter = ipPort2RequestRouter.get(ipPort);            if (requestRouter != null) {                requestRouter.removeProvider(provider);            }        }        LoggerUtil.info("yarRpcExporter unexport Success: url={}", url);    }}

接著看endpointFactory,具體的實作類別是netty4yar

@SpiMeta(name = "netty4yar")public class Netty4YarEndpointFactory extends AbstractEndpointFactory {    @Override    protected Server innerCreateServer(URL url, MessageHandler messageHandler) {        return new Netty4HttpServer(url, new YarMessageHandlerWarpper(messageHandler));    }    @Override    protected Client innerCreateClient(URL url) {        // TODO         throw new MotanFrameworkException("not yet implemented!");    }}

看netty的server的initchannel

        b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {            @Override            public void initChannel(SocketChannel ch) throws Exception {                ch.pipeline().addLast("http-decoder", new HttpRequestDecoder());                ch.pipeline().addLast("http-aggregator", new HttpObjectAggregator(maxContentLength));                ch.pipeline().addLast("http-encoder", new HttpResponseEncoder());                ch.pipeline().addLast("http-chunked", new ChunkedWriteHandler());                ch.pipeline().addLast("serverHandler", handler);            }        }).option(ChannelOption.SO_BACKLOG, 1024).childOption(ChannelOption.SO_KEEPALIVE, false);

接著看看handler

public class YarMessageHandlerWarpper implements MessageHandler {    private YarMessageRouter orgHandler;    public YarMessageHandlerWarpper(MessageHandler orgHandler) {        if (orgHandler == null) {            throw new MotanFrameworkException("messageHandler is null!");        }        if (orgHandler instanceof YarMessageRouter) {            this.orgHandler = (YarMessageRouter) orgHandler;        } else {            throw new MotanFrameworkException("YarMessageHandlerWarper can not wrapper " + orgHandler.getClass().getSimpleName());        }    }    @Override    public Object handle(Channel channel, Object message) {        FullHttpRequest httpRequest = (FullHttpRequest) message;        String uri = httpRequest.getUri();        int index = uri.indexOf("?");// should not be null        String requestPath = uri;        Map<String, String> attachments = null;        if (index > -1) {            requestPath = uri.substring(0, index);            if (index != uri.length() - 1) {                attachments = getAttachMents(uri.substring(index + 1, uri.length()));            }        }        YarResponse yarResponse = null;        String packagerName = "JSON";        try {            ByteBuf buf = httpRequest.content();            final byte[] contentBytes = new byte[buf.readableBytes()];            buf.getBytes(0, contentBytes);            YarRequest yarRequest = new AttachmentRequest(YarProtocol.buildRequest(contentBytes), attachments);            yarRequest.setRequestPath(requestPath);            yarResponse = (YarResponse) orgHandler.handle(channel, yarRequest);        } catch (Exception e) {            LoggerUtil.error("YarMessageHandlerWarpper handle yar request fail.", e);            yarResponse = YarProtocolUtil.buildDefaultErrorResponse(e.getMessage(), packagerName);        }        byte[] responseBytes;        try {            responseBytes = YarProtocol.toProtocolBytes(yarResponse);        } catch (IOException e) {            throw new MotanFrameworkException("convert yar response to bytes fail.", e);        }        FullHttpResponse httpResponse =                new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, Unpooled.wrappedBuffer(responseBytes));        httpResponse.headers().set(HttpHeaders.Names.CONTENT_TYPE, "application/x-www-form-urlencoded");        httpResponse.headers().set(HttpHeaders.Names.CONTENT_LENGTH, httpResponse.content().readableBytes());        if (HttpHeaders.isKeepAlive(httpRequest)) {            httpResponse.headers().set(HttpHeaders.Names.CONNECTION, Values.KEEP_ALIVE);        } else {            httpResponse.headers().set(HttpHeaders.Names.CONNECTION, Values.CLOSE);        }        return httpResponse;    }    private Map<String, String> getAttachMents(String params) {        Map<String, String> map = new HashMap<String, String>();        String[] paramArray = params.split("&");        for (String param : paramArray) {            String[] kv = param.split("=");            if (kv.length == 2) {                map.put(kv[0], kv[1]);            } else {                LoggerUtil.warn("yar attachment parse fail. uri param:" + param);            }        }        return map;    }}