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// Copyright 2022-2023 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()
// endpoint handler - in this case, HandlerFunc is used,
// which is a built-in implementation of Handler interface
echoHandler := func(req micro.Request) {
req.Respond(req.Data())
}
// second endpoint
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)))
}
// third endpoint
multiplyHandler := 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 * 2
req.Respond([]byte(strconv.Itoa(responseData)))
}
config := micro.Config{
Name: "IncrementService",
Version: "0.1.0",
Description: "Increment numbers",
// base handler - for simple services with single endpoints this is sufficient
Endpoint: µ.EndpointConfig{
Subject: "echo",
Handler: micro.HandlerFunc(echoHandler),
},
}
svc, err := micro.AddService(nc, config)
if err != nil {
log.Fatal(err)
}
defer svc.Stop()
// add a group to aggregate endpoints under common prefix
numbers := svc.AddGroup("numbers")
// register endpoints in a group
err = numbers.AddEndpoint("Increment", micro.HandlerFunc(incrementHandler))
if err != nil {
log.Fatal(err)
}
err = numbers.AddEndpoint("Multiply", micro.HandlerFunc(multiplyHandler))
if err != nil {
log.Fatal(err)
}
// 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)
}
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