go微服务框架kratos学习笔记三(构建单独的http或者grpc demo项目)

前面两篇跑通了demo项目，和大概了解了kratos demo总体结构，本篇分别构建一个http和一个grpc微服务单独测试。git

grpc

先从grpc 开始，上篇没有测试grpc接口，这回来尝试，直接跑起demo 服务。github

kratos new rpcdemo --grpc

kratos run
INFO 12/26-20:49:08.933 I:/VSProject/kratos/rpcdemo/cmd/main.go:19 rpcdemo start
2019/12/26 20:49:08 start watch filepath: I:\VSProject\kratos\rpcdemo\configs
[warden] config is Deprecated, argument will be ignored. please use -grpc flag or GRPC env to configure warden server.
INFO 12/26-20:49:08.953 I:/VSProject/go/pkg/mod/github.com/bilibili/kratos@v0.3.2-0.20191224125553-6e1180f53a8e/pkg/net/rpc/warden/server.go:329 warden: start grpc listen addr: [::]:9000

warden

不改gRPC源码，基于接口进行包装集成trace、log、prom等组件
打通自有服务注册发现系统discovery
实现更平滑可靠的负载均衡算法json

// New new a grpc server.
func New(svc pb.DemoServer) (ws *warden.Server, err error) {
    var (
        cfg warden.ServerConfig
        ct paladin.TOML
    )
    if err = paladin.Get("grpc.toml").Unmarshal(&ct); err != nil {
        return
    }
    if err = ct.Get("Server").UnmarshalTOML(&cfg); err != nil {
        return
    }
    ws = warden.NewServer(&cfg)
    pb.RegisterDemoServer(ws.Server(), svc)
    ws, err = ws.Start()
    return
}

warden

package main

import (
    "fmt"

    pb "cli/api"

    "golang.org/x/net/context"
    "google.golang.org/grpc"
)

const (
    Address = "127.0.0.1:50052"
)

func main() {

    conn, err := grpc.Dial("127.0.0.1:9000", grpc.WithInsecure())
    if err != nil {
        fmt.Println(err)
    }
    defer conn.Close()

    c := pb.NewDemoClient(conn)

    req := new(pb.HelloReq)
    req.Name = "kratos grpc"
    r, err := c.SayHelloURL(context.Background(), req)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(r.Content)

}

在这里插入图片描述

http

前面内容都是基于kratos 本来demo的使用，如今咱们本身随便定义一个liveroom.proto的bm服务, 看看须要改动哪些，跑起微服务。app

建立一个只生成bm代码的项目liveroom负载均衡

kratos new liveroom -d C:\项目路径 --http

I:/VSProject/kratos/liveroom/cmd/main.go:19 liveroom start
2019/12/26 20:13:59 start watch filepath: I:\VSProject\kratos\liveroom\configs
INFO 12/26-20:13:59.446 I:/VSProject/go/pkg/mod/github.com/bilibili/kratos@v0.3.2-0.20191224125553-6e1180f53a8e/pkg/net/http/blademaster/server.go:98 blademaster: start http listen addr: 0.0.0.0:8000

但这只是前两章的demo项目，接着删掉api 路径下的pb.go和bm.go，定义本身的api.proto框架

syntax = "proto3";

import "github.com/gogo/protobuf/gogoproto/gogo.proto";
import "google/protobuf/empty.proto";
import "google/api/annotations.proto";

// package 命名使用 {appid}.{version} 的方式, version 形如 v1, v2 ..
package liveroom.service.v1;

// NOTE: 最后请删除这些无用的注释 (゜-゜)つロ 

option go_package = "api";
option (gogoproto.goproto_getters_all) = false;

service Liveroom {
    rpc Create (Req) returns (Resp);
    rpc Delete (Req) returns (Resp);
    rpc Get(Req) returns (Resp) {
        option (google.api.http) = {
            get:"/live-room/get"
        };
    };
}

message Req {
    string name = 1 [(gogoproto.moretags)='form:"name" validate:"required"'];
}

message Resp {
    string Content = 1 [(gogoproto.jsontag) = 'content'];
}

go generate

go generate
go get -u github.com/bilibili/kratos/tool/kratos-protoc
protoc: 安装成功!
2019/12/26 20:26:44 protoc --proto_path=I:\VSProject\go/src --proto_path=I:\VSProject\go/pkg/mod/github.com/bilibili/kratos@v0.3.2-0.20191224125553-6e1180f53a8e/third_party --proto_path=I:\VSProject\kratos\liveroom\api --bm_out=:. api.proto
api.proto:7:1: warning: Import google/protobuf/empty.proto is unused.
2019/12/26 20:26:44 protoc --proto_path=I:\VSProject\go/src --proto_path=I:\VSProject\go/pkg/mod/github.com/bilibili/kratos@v0.3.2-0.20191224125553-6e1180f53a8e/third_party --proto_path=I:\VSProject\kratos\liveroom\api --gofast_out=plugins=grpc:. api.proto
api.proto:7:1: warning: Import google/protobuf/empty.proto is unused.
2019/12/26 20:26:44 generate api.proto success.

client.go 的newclient()接口也须要重定义。

接着service 层业务逻辑层从新定义咱们的接口实现

func (s *Service) Create(ctx context.Context, req *pb.Req) (reply *pb.Resp, err error) {
    reply = &pb.Resp{
        Content: "Create " + req.Name,
    }
    fmt.Printf("Create %s", req.Name)
    return
}

func (s *Service) Delete(ctx context.Context, req *pb.Req) (reply *pb.Resp, err error) {
    reply = &pb.Resp{
        Content: "Delete " + req.Name,
    }
    fmt.Printf("Delete %s", req.Name)
    return
}

func (s *Service) Get(ctx context.Context, req *pb.Req) (reply *pb.Resp, err error) {
    reply = &pb.Resp{
        Content: "Get " + req.Name,
    }
    fmt.Printf("Get %s", req.Name)
    return
}

依赖注入层修改wire.go
从新生成静态分析文件wire_gen.go。
go generate

>go generate
go get -u github.com/google/wire/cmd/wire
go: finding golang.org/x/tools latest
wire: 安装成功!
wire: liveroom/internal/di: wrote I:\VSProject\kratos\liveroom\internal\di\wire_gen.go

解决编译问题，bm微服务就起来了。

kratos run
INFO 12/26-20:39:48.725 I:/VSProject/kratos/liveroom/cmd/main.go:19 liveroom start
2019/12/26 20:39:48 start watch filepath: I:\VSProject\kratos\liveroom\configs
INFO 12/26-20:39:48.755 I:/VSProject/go/pkg/mod/github.com/bilibili/kratos@v0.3.2-0.20191224125553-6e1180f53a8e/pkg/net/http/blademaster/server.go:98 blademaster: start http listen addr: 0.0.0.0:8000

在这里插入图片描述

发现，大体要改的地方其实并很少：一、service 改proto定义的接口逻辑二、从新wirei静态分析三、解决编译报错。