コード例 #1
0
func ExampleInstanceSetSource_Latest_compare() {
	e := makeConnection()
	svipAddress := "my_vip"
	source, err := e.NewInstanceSetSourceForSecureVIPAddress(svipAddress, true, fargo.WithStatus(fargo.DOWN), fargo.WithStatus(fargo.OUTOFSERVICE))
	if err != nil {
		fmt.Println(err)
		return
	}
	defer source.Stop()
	var troubled []*fargo.Instance
	for remaining := 10; ; {
		if instances := source.Latest(); instances != nil {
			fmt.Printf("VIP address %q has %d troubled instances.", svipAddress, len(instances))
			switch diff := len(instances) - len(troubled); {
			case diff > 0:
				fmt.Printf(" (%d more than last time)\n", diff)
			case diff < 0:
				fmt.Printf(" (%d fewer than last time)\n", diff)
			default:
				fmt.Println()
			}
			troubled = instances
		}
		remaining--
		if remaining == 0 {
			break
		}
		time.Sleep(30 * time.Second)
	}
}
コード例 #2
0
ファイル: net_test.go プロジェクト: hudl/fargo
func TestGetSingleInstanceByVIPAddress(t *testing.T) {
	if testing.Short() {
		t.SkipNow()
	}
	e, _ := fargo.NewConnFromConfigFile("./config_sample/local.gcfg")
	cacheDelay := 35 * time.Second
	vipAddress := "app"
	for _, e.UseJson = range []bool{false, true} {
		Convey("When the VIP address has one instance", t, withRegisteredInstance(&e, func(instance *fargo.Instance) {
			time.Sleep(cacheDelay)
			instances, err := e.GetInstancesByVIPAddress(vipAddress)
			So(err, ShouldBeNil)
			So(instances, ShouldHaveLength, 1)
			So(instances[0].VipAddress, ShouldEqual, vipAddress)
			Convey("requesting the instances by that VIP address with status UP should provide that one", func() {
				instances, err := e.GetInstancesByVIPAddress(vipAddress, fargo.ThatAreUp)
				So(err, ShouldBeNil)
				So(instances, ShouldHaveLength, 1)
				So(instances[0].VipAddress, ShouldEqual, vipAddress)
				Convey("and when the instance has a status other than UP", func() {
					otherStatus := fargo.OUTOFSERVICE
					So(otherStatus, ShouldNotEqual, fargo.UP)
					err := e.UpdateInstanceStatus(instance, otherStatus)
					So(err, ShouldBeNil)
					Convey("selecting instances with that other status should provide that one", func() {
						time.Sleep(cacheDelay)
						instances, err := e.GetInstancesByVIPAddress(vipAddress, fargo.WithStatus(otherStatus))
						So(err, ShouldBeNil)
						So(instances, ShouldHaveLength, 1)
						Convey("And selecting instances with status UP should provide none", func() {
							// Ensure that we tolerate a nil option safely.
							instances, err := e.GetInstancesByVIPAddress(vipAddress, fargo.ThatAreUp, nil)
							So(err, ShouldBeNil)
							So(instances, ShouldBeEmpty)
						})
					})
				})
			})
		}))
		Convey("When the secure VIP address has one instance", t, withRegisteredInstance(&e, func(_ *fargo.Instance) {
			Convey("requesting the instances by that VIP address should provide that one", func() {
				time.Sleep(cacheDelay)
				// Ensure that we tolerate a nil option safely.
				instances, err := e.GetInstancesBySecureVIPAddress(vipAddress, nil)
				So(err, ShouldBeNil)
				So(instances, ShouldHaveLength, 1)
				So(instances[0].SecureVipAddress, ShouldEqual, vipAddress)
			})
		}))
		time.Sleep(cacheDelay)
	}
}
コード例 #3
0
ファイル: example_vipupdate_test.go プロジェクト: hudl/fargo
func ExampleEurekaConnection_ScheduleVIPAddressUpdates_context() {
	e := makeConnection()
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()
	vipAddress := "my_vip"
	// Look for instances that are in trouble.
	updates, err := e.ScheduleVIPAddressUpdates(vipAddress, true, ctx.Done(), fargo.WithStatus(fargo.DOWN), fargo.WithStatus(fargo.OUTOFSERVICE))
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Printf("Monitoring VIP address %q.\n", vipAddress)
	for update := range updates {
		if update.Err != nil {
			fmt.Printf("Most recent request for VIP address %q's instances failed: %v\n", vipAddress, update.Err)
			continue
		}
		fmt.Printf("VIP address %q has %d instances in trouble.\n", vipAddress, len(update.Instances))
	}
	fmt.Printf("Done monitoring VIP address %q.\n", vipAddress)
}