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example_package_test.go
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/
example_package_test.go
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// Copyright 2022 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package micro_test
import (
"fmt"
"log"
"strconv"
"time"
"github.com/nats-io/nats.go"
"github.com/nats-io/nats.go/micro"
)
func Example() {
nc, err := nats.Connect("127.0.0.1:4222")
if err != nil {
log.Fatal(err)
}
defer nc.Close()
// Service handler is a function which takes Service.Request as argument.
// req.Respond or req.Error should be used to respond to the request.
incrementHandler := func(req micro.Request) {
val, err := strconv.Atoi(string(req.Data()))
if err != nil {
req.Error("400", "request data should be a number", nil)
return
}
responseData := val + 1
req.Respond([]byte(strconv.Itoa(responseData)))
}
config := micro.Config{
Name: "IncrementService",
Version: "0.1.0",
Description: "Increment numbers",
Endpoint: micro.Endpoint{
// service handler
Handler: incrementHandler,
// a unique subject serving as a service endpoint
Subject: "numbers.increment",
},
}
// Multiple instances of the servcice with the same name can be created.
// Requests to a service with the same name will be load-balanced.
for i := 0; i < 5; i++ {
svc, err := micro.AddService(nc, config)
if err != nil {
log.Fatal(err)
}
defer svc.Stop()
}
// send a request to a service
resp, err := nc.Request("numbers.increment", []byte("3"), 1*time.Second)
if err != nil {
log.Fatal(err)
}
responseVal, err := strconv.Atoi(string(resp.Data))
if err != nil {
log.Fatal(err)
}
fmt.Println(responseVal)
}