实现基本的平均负载均衡

client/main.go

@@ -19,6 +19,9 @@ func main() {
 		}).Errorf("%v", err)
 		return
 	}
+	if node == nil {
+		return
+	}
 
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	// conn, err := grpc.Dial("127.0.0.1:9001", grpc.WithBlock(), grpc.WithInsecure())

consul/consul-service.go

@@ -2,6 +2,8 @@ package consul
 
 import (
 	"fmt"
+	"math/rand"
+	"time"
 
 	consulapi "github.com/hashicorp/consul/api"
 	log "github.com/sirupsen/logrus"
@@ -78,10 +80,16 @@ func FindNode(servicename string) (*consulapi.AgentService, error) {
 	if err != nil {
 		return nil, err
 	}
-	for _, service := range services {
+	l := len(services)
-		return service.Service, nil
+	if l == 0 {
+		return nil, nil
 	}
-	return nil, nil
+	if l == 1 {
+		return services[0].Service, nil
+	}
+
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	return services[r.Intn(l)%l].Service, nil
 }
 
 //FindServer 从consul中发现服务