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Posted to notifications@dubbo.apache.org by "Silocean (via GitHub)" <gi...@apache.org> on 2023/03/24 02:30:01 UTC
[GitHub] [dubbo] Silocean opened a new issue, #11909: dubbo3客户端服务通过nacos调用下游C++服务失败
Silocean opened a new issue, #11909:
URL: https://github.com/apache/dubbo/issues/11909
### 一、目的
有一个使用brpc的C++下游服务和一个使用dubbo3的java上游服务，希望将C++服务通过nacos HTTP接口注册到nacos注册中心，java服务通过nacos注册中心拿到下游服务实例列表，以此实现跨语言服务调用。
### 二、实现方法
1. 在测试机上启动C++服务，监听8000端口；
2. 使用nacos HTTP接口注册服务(http://localhost:8848/nacos/v1/ns/instance?ip=10.41.133.13&port=8000&weight=1.0&serviceName=brpc-server-provider-test)；
3. 测试机上启动脚本每隔5秒发送一次实例心跳，保证该实例健康；
服务状态信息如下图所示：
4. java服务通过dubbo调用该C++服务，使用协议为triple，代码如下：
```java
DubboBootstrap bootstrap = DubboBootstrap.newInstance();
ReferenceConfig<EchoService> ref = new ReferenceConfig<>();
ref.setInterface(EchoService.class);
ref.setProtocol(CommonConstants.TRIPLE);
ref.setProxy(CommonConstants.NATIVE_STUB);
ref.setTimeout(3000);
ConsumerConfig consumerConfig = new ConsumerConfig();
bootstrap.application(new ApplicationConfig("dubbo-grpc-client"))
.registry(new RegistryConfig("nacos://localhost:8848"))
.consumer(consumerConfig)
.reference(ref)
.start();
EchoService echoService = ref.get();
EchoRequest request = EchoRequest.newBuilder().setMessage("hello echo").build();
EchoResponse reply = echoService.echo(request);
System.out.println("received replay: " + reply.getMessage());
```
5. java客户端调用出错，报错信息如下：
### 三、问题
1. 推测是java客户端调用代码有问题，我理解调用方在调用时需要指定下游的服务名字（brpc-server-provider-test），才能知道调用方要取的是nacos上哪个服务的实例，但是我不清楚应该在哪里设置下游服务名字？
2. c++服务端注册缺失了metadata？
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Re: [I] dubbo3客户端服务通过nacos调用下游C++服务失败 [dubbo]
Posted by "blessyyyu (via GitHub)" <gi...@apache.org>.
blessyyyu commented on issue #11909:
URL: https://github.com/apache/dubbo/issues/11909#issuecomment-1900237683
大佬，能否将您这次尝试的代码开源呢？有相同的想法来实现跨语言服务调用
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[GitHub] [dubbo] Silocean commented on issue #11909: dubbo3客户端服务通过nacos调用下游C++服务失败
Posted by "Silocean (via GitHub)" <gi...@apache.org>.
Silocean commented on issue #11909:
URL: https://github.com/apache/dubbo/issues/11909#issuecomment-1482528976
已解决：
1. metadata中需要加上使用的协议
```json
{
"protocol": "tri"
}
```
2. 服务注册的名字要按照以下固定格式来
```
providers:${rpc接口全限定名}:${version}:${group}
```
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[GitHub] [dubbo] Silocean closed issue #11909: dubbo3客户端服务通过nacos调用下游C++服务失败
Posted by "Silocean (via GitHub)" <gi...@apache.org>.
Silocean closed issue #11909: dubbo3客户端服务通过nacos调用下游C++服务失败
URL: https://github.com/apache/dubbo/issues/11909
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