使用 dubbogo.yml 配置文件开发应用

1.介绍

本文档演示如何在框架中使用 yaml 配置文件进行微服务开发，是相比于 API 的另一种微服务开发模式。你可以完全使用 yml 配置文件进行开发，也可以将部分全局配置放到配置文件，而只在 API 中完成服务定义。

这种模式下，一定要通过 DUBBO_GO_CONFIG_PATH 指定配置文件路径：

export DUBBO_GO_CONFIG_PATH="../conf/dubbogo.yml"

2. 使用说明

可在此查看完整示例源码。

2.1 运行示例

.
├── go-client
│   ├── cmd
│   │   └── main.go
│   └── conf
│       └── dubbogo.yml
├── go-server
│   ├── cmd
│   │   └── main.go
│   └── conf
│       └── dubbogo.yml
└─── proto
    ├── greet.pb.go
    ├── greet.proto
    └── greet.triple.go

通过 IDL./proto/greet.proto 定义服务使用triple协议

build Proto

cd path_to_dubbogo-sample/config_yaml/proto
protoc --go_out=. --go-triple_out=. ./greet.proto

Server

export DUBBO_GO_CONFIG_PATH="../conf/dubbogo.yml"
cd path_to_dubbogo-sample/config_yaml/go-server/cmd
go run .

Client

export DUBBO_GO_CONFIG_PATH="../conf/dubbogo.yml"
cd path_to_dubbogo-sample/config_yaml/go-client/cmd
go run .

2.2 客户端使用说明

客户端定义的 yaml 文件：

# dubbo client yaml configure file
dubbo:
  registries:
    demoZK:
      protocol: zookeeper
      timeout: 3s
      address: 127.0.0.1:2181
  consumer:
    references:
      GreetServiceImpl:
        protocol: tri
        interface: com.apache.dubbo.sample.Greeter
        registry: demoZK
        retries: 3
        timeout: 3000

通过 dubbo.Load() 调用进行文件的读取以及加载

//...
func main() {
	//...
	if err := dubbo.Load(); err != nil {
		//...
	}
	//...
}

2.3 服务端使用说明

服务端定义的 yaml 文件

# dubbo server yaml configure file
dubbo:
  registries:
    demoZK:
      protocol: zookeeper
      timeout: 10s
      address: 127.0.0.1:2181
  protocols:
    tripleProtocol:
      name: tri
      port: 20000
  provider:
    services:
      GreetTripleServer:
        interface: com.apache.dubbo.sample.Greeter

通过 dubbo.Load() 调用进行文件的读取以及加载

//...
func main() {
	//...
	if err := dubbo.Load(); err != nil {
		//...
	}
	//...
}

3.示例详解

3.1服务端介绍

服务端proto文件

源文件路径：dubbo-go-sample/context/proto/greet.proto

syntax = "proto3";

package greet;

option go_package = "github.com/apache/dubbo-go-samples/config_yaml/proto;greet";

message GreetRequest {
  string name = 1;
}

message GreetResponse {
  string greeting = 1;
}

service GreetService {
  rpc Greet(GreetRequest) returns (GreetResponse) {}
}

服务端handler文件

在服务端中，定义 GreetTripleServer:

type GreetServiceHandler interface {
    Greet(context.Context, *GreetRequest) (*GreetResponse, error)
}

实现 GreetServiceHandler 接口，通过 greet.SetProviderService(&GreetTripleServer{}) 进行注册，同样使用 dubbo.Load() 进行加载配置文件

源文件路径：dubbo-go-sample/config_yaml/go-server/cmd/main.go

package main

import (
	"context"
	"errors"
	"fmt"

	"dubbo.apache.org/dubbo-go/v3"
	_ "dubbo.apache.org/dubbo-go/v3/imports"
	greet "github.com/apache/dubbo-go-samples/config_yaml/proto"
)

type GreetTripleServer struct {
}

func (srv *GreetTripleServer) Greet(ctx context.Context, req *greet.GreetRequest) (*greet.GreetResponse, error) {
	name := req.Name
	if name != "ConfigTest" {
		errInfo := fmt.Sprintf("name is not right: %s", name)
		return nil, errors.New(errInfo)
	}

	resp := &greet.GreetResponse{Greeting: req.Name + "-Success"}
	return resp, nil
}

func main() {
	greet.SetProviderService(&GreetTripleServer{})
	if err := dubbo.Load(); err != nil {
		panic(err)
	}
	select {}
}

3.2 客户端介绍

在客户端中，定义greet.GreetServiceImpl实例，greet.SetConsumerService(svc)进行注册: 通过 dubbo.Load() 进行配置文件的加载

源文件路径：dubbo-go-sample/config_yaml/go-client/cmd/main.go

package main

import (
	"context"
	"dubbo.apache.org/dubbo-go/v3"
	_ "dubbo.apache.org/dubbo-go/v3/imports"
	greet "github.com/apache/dubbo-go-samples/config_yaml/proto"
	"github.com/dubbogo/gost/log/logger"
)

var svc = new(greet.GreetServiceImpl)

func main() {
	greet.SetConsumerService(svc)
	if err := dubbo.Load(); err != nil {
		panic(err)
	}
	req, err := svc.Greet(context.Background(), &greet.GreetRequest{Name: "ConfigTest"})
	if err != nil || req.Greeting != "ConfigTest-Success" {
		panic(err)
	}
	logger.Info("ConfigTest successfully")
}

3.3 案例效果

先启动服务端，再启动客户端，可以观察到客户端打印了ConfigTest successfully配置加载以及调用成功

2024-03-11 15:47:29     INFO    cmd/main.go:39  ConfigTest successfully

4 更多配置

指定 Filter

如果要指定多个 filter 时，可用 ‘,’ 分隔

Consumer 端

dubbo:
  consumer:
    filter: echo,token,tps,myCustomFilter # 可指定自定义filter

Provider 端

dubbo:
  provider:
    services:
      GreeterProvider:
        filter: myCustomFilter,echo,tps

最后修改 September 13, 2024: Refactor website structure (#2860) (1a4b998f54)