VirtualHost getVirtualHost(String name, String clusterName) {``    ``RouteAction routeAction = RouteAction.newBuilder()``            ``.setCluster(clusterName)``            ``.build();

    ``HeaderMatcher headerMatcher = HeaderMatcher.newBuilder()``            ``.setName(``"UID"``)``            ``.setExactMatch(``"5784024476"``)``            ``.build();

    ``RouteMatch routeMatch = RouteMatch.newBuilder()``            ``.setGrpc(GrpcRouteMatchOptions.newBuilder()) ``// 确定只匹配Grpc Match``            ``.setPrefix(``"/"``)``            ``.addHeaders(headerMatcher)``            ``.build();``    ``Route route = Route.newBuilder()``            ``.setMatch(routeMatch)``            ``.setRoute(routeAction)``            ``.build();``    ``VirtualHost virtualHost = VirtualHost.newBuilder()``            ``.setName(name)``            ``.addDomains(``"*"``)``            ``.addRoutes(route)``            ``.build();

``return virtualHost;``}

服务发现动态配置，示例代码：

Endpoint endpoint = ClusterSnapshot.toEndpoint(host + ``":"

+ port);``ClusterLoadAssignment clusterLoadAssignment = simpleCache.getSnapshot(``0``).endpoints().resources().get(CLUSTER_NAME);``LocalityLbEndpoints localityLbEndpoints = LocalityLbEndpoints.newBuilder()``        ``.addLbEndpoints(LbEndpoint.newBuilder().setEndpoint(endpoint).build())``        ``.build();

List<ClusterLoadAssignment> assignments = ImmutableList.<ClusterLoadAssignment>builder()``        ``.add(clusterLoadAssignment.toBuilder().addEndpoints(localityLbEndpoints).build())``        ``.build();

Cluster.EdsClusterConfig edsClusterConfig = ClusterSnapshot.getEdsClusterConfig(CLUSTER_NAME, DISCOVERY_CLUSTER_NAME);``List<Cluster> clusters = ImmutableList.<Cluster>builder()``        ``.add(ClusterSnapshot.getCluster(CLUSTER_NAME, edsClusterConfig))``        ``.build();``Snapshot snapshot = Snapshot.create(``        ``clusters,``        ``assignments,``        ``ImmutableList.of(),``        ``ImmutableList.of(),``        ``ImmutableList.of(),``        ``version);``simpleCache.setSnapshot(``0``, snapshot);

client端

对于路由信息目前是在header（也就是GRPC的类Metadata）里面附加路由参数：

skyao.io/learning-gr…

提供对读取和写入元数据数值的访问，元数据数值在调用期间交换。

key 容许关联到多个值。

这个类不是线程安全，实现应该保证 header 的读取和写入不在多个线程中并发发生。

client代码实现：ClientHeaderInterceptor

public class ClientHeaderInterceptor ``implements ClientInterceptor { ``private static final

Logger logger = Logger.getLogger(ClientHeaderInterceptor.``class``.getName());``    ``Metadata.Key<String> cookie = Metadata.Key.of(``"cookie"``, Metadata.ASCII_STRING_MARSHALLER);

``@Override`` ``public

<ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(MethodDescriptor<ReqT, RespT> method,``                                                               ``CallOptions callOptions, Channel next) {``        ``return

new

ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(next.newCall(method, callOptions)) {``            ``@Override``            ``public

void

start(Listener<RespT> responseListener, Metadata headers) {``                ``//此处为你登录后获得的cookie的值``                ``headers.put(cookie, ``"U=6371181803"``);``                ``super``.start(``new

ForwardingClientCallListener.SimpleForwardingClientCallListener<RespT>(responseListener) {``                    ``@Override``                    ``public

void

onHeaders(Metadata headers) {``                        ``/**``                         ``* if you don't need receive header from server, you can``                         ``* use {@link io.grpc.stub.MetadataUtils#attachHeaders}``                         ``* directly to send header``                         ``*/``                        ``logger.info(``"header received from server:"

+ headers);``                        ``super``.onHeaders(headers);``                    ``}``                ``}, headers);``            ``}``        ``};``    ``}``}

调用，这部分先写死，后续更改为动态配置，示例代码：

static final Metadata.Key<String> COOKIE = Metadata.Key.of(``"cookie"``, Metadata.ASCII_STRING_MARSHALLER);``private final ManagedChannel originalChannel;``private final XUserDeviceServiceGrpc.XUserDeviceServiceBlockingStub blockingStub;``private final XUserDeviceServiceGrpc.XUserDeviceServiceBlockingStub headerBlockingStub; public XueqiuPushUserClientTest(String host, ``int

port) {``    ``originalChannel = ManagedChannelBuilder.forAddress(host, port).usePlaintext(``true``).build();``    ``//将ClientHeaderInterceptor和原有的channel结合，生成包含拦截器的channel``    ``Channel channel = ClientInterceptors.intercept(originalChannel, ``new

ClientHeaderInterceptor());`` ``blockingStub = XUserDeviceServiceGrpc.newBlockingStub(channel);

    ``//如果只需要在客户端传送header，而不需要接受服务端的header可以简单调用MetadataUtils.attachHeaders注册meta数据而不用定义Interceptor``    ``XUserDeviceServiceGrpc.XUserDeviceServiceBlockingStub stub = XUserDeviceServiceGrpc.newBlockingStub(originalChannel);``    ``Metadata meta = ``new

Metadata();``    ``meta.put(COOKIE, ``"U=6371181803"``);``    ``headerBlockingStub = MetadataUtils.attachHeaders(stub, meta);``}

grpc基于envoy治理 java实现 control panel

envoy的部署与架构：

envoy基础（1.7版本的）：

业内厂商实现案例：

Apisix Linkerd Envoy对比

grpc基于envoy治理实现

server端

client端