Learn by Example on Go Micro

Hello Service

Mon, 01 Jan 0001 00:00:00 +0000

Service

package main

import (
 "context"
 "go-micro.dev/v6"
)

type Request struct { Name string `json:"name"` }

type Response struct { Message string `json:"message"` }

type Say struct{}

func (h *Say) Hello(ctx context.Context, req *Request, rsp *Response) error {
 rsp.Message = "Hello " + req.Name
 return nil
}

func main() {
 svc := micro.NewService("helloworld")
 svc.Init()
 svc.Handle(new(Say))
 svc.Run()
}

Run it:

Rpc Client

Mon, 01 Jan 0001 00:00:00 +0000

package main

import (
 "context"
 "fmt"
 "go-micro.dev/v6"
)

type Request struct { Name string }

type Response struct { Message string }

func main() {
 svc := micro.NewService("caller")
 svc.Init()

 req := svc.Client().NewRequest("helloworld", "Say.Hello", &Request{Name: "John"})
 var rsp Response

 if err := svc.Client().Call(context.TODO(), req, &rsp); err != nil {
 fmt.Println("error:", err)
 return
 }

 fmt.Println(rsp.Message)
}

Service Discovery with Consul

Mon, 01 Jan 0001 00:00:00 +0000

In code

package main

import (
 "go-micro.dev/v6"
 "go-micro.dev/v6/registry/consul"
)

func main() {
 reg := consul.NewConsulRegistry()
 svc := micro.NewService("consul-registry", micro.Registry(reg))
 svc.Init()
 svc.Run()
}

Via environment

Run your service with env vars set:

MICRO_REGISTRY=consul MICRO_REGISTRY_ADDRESS=127.0.0.1:8500 go run main.go

Store Postgres

Mon, 01 Jan 0001 00:00:00 +0000

In code

package main

import (
 "log"
 "go-micro.dev/v6"
 "go-micro.dev/v6/store"
 postgres "go-micro.dev/v6/store/postgres"
)

func main() {
 st := postgres.NewStore()
 svc := micro.NewService("postgres-store", micro.Store(st))
 svc.Init()

 _ = store.Write(&store.Record{Key: "foo", Value: []byte("bar")})
 recs, _ := store.Read("foo")
 log.Println("value:", string(recs[0].Value))

 svc.Run()
}

Via environment

Run your service with env vars set:

MICRO_STORE=postgres \
MICRO_STORE_ADDRESS=postgres://user:pass@127.0.0.1:5432/postgres \
MICRO_STORE_DATABASE=micro \
MICRO_STORE_TABLE=micro \
go run main.go

Transport Nats

Mon, 01 Jan 0001 00:00:00 +0000

In code

package main

import (
 "go-micro.dev/v6"
 tnats "go-micro.dev/v6/transport/nats"
)

func main() {
 t := tnats.NewTransport()
 svc := micro.NewService("nats-transport", micro.Transport(t))
 svc.Init()
 svc.Run()
}

Via environment

Run your service with env vars set:

MICRO_TRANSPORT=nats MICRO_TRANSPORT_ADDRESS=nats://127.0.0.1:4222 go run main.go