open-consul/agent/router/router_test.go

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package router
import (
"fmt"
"net"
"reflect"
"sort"
"strings"
"testing"
"time"
"github.com/hashicorp/serf/coordinate"
"github.com/hashicorp/serf/serf"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/sdk/testutil"
"github.com/hashicorp/consul/types"
"github.com/stretchr/testify/require"
)
type mockCluster struct {
self string
members []serf.Member
coords map[string]*coordinate.Coordinate
addr int
}
func newMockCluster(self string) *mockCluster {
return &mockCluster{
self: self,
coords: make(map[string]*coordinate.Coordinate),
addr: 1,
}
}
func (m *mockCluster) NumNodes() int {
return len(m.members)
}
func (m *mockCluster) Members() []serf.Member {
return m.members
}
func (m *mockCluster) GetCoordinate() (*coordinate.Coordinate, error) {
return m.coords[m.self], nil
}
func (m *mockCluster) GetCachedCoordinate(name string) (*coordinate.Coordinate, bool) {
coord, ok := m.coords[name]
return coord, ok
}
func (m *mockCluster) AddMember(dc string, name string, coord *coordinate.Coordinate) {
member := serf.Member{
Name: fmt.Sprintf("%s.%s", name, dc),
Addr: net.ParseIP(fmt.Sprintf("127.0.0.%d", m.addr)),
Port: 8300,
Tags: map[string]string{
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"dc": dc,
"role": "consul",
"port": "8300",
"build": "0.8.0",
"vsn": "3",
},
}
m.members = append(m.members, member)
if coord != nil {
m.coords[member.Name] = coord
}
m.addr++
}
func (m *mockCluster) AddLANMember(dc, name, role string, coord *coordinate.Coordinate) {
member := serf.Member{
Name: name,
Addr: net.ParseIP(fmt.Sprintf("127.0.0.%d", m.addr)),
Port: 8300,
Tags: map[string]string{
"dc": dc,
"role": role,
"port": "8300",
"build": "0.8.0",
"vsn": "3",
},
}
m.members = append(m.members, member)
if coord != nil {
m.coords[member.Name] = coord
}
m.addr++
}
// testCluster is used to generate a single WAN-like area with a known set of
// member and RTT topology.
//
// Here's the layout of the nodes:
//
// /---- dc1 ----\ /- dc2 -\ /- dc0 -\
// node2 node1 node3 node1 node0
// | | | | | | | | | | |
// 0 1 2 3 4 5 6 7 8 9 10 (ms)
//
// We also include a node4 in dc1 with no known coordinate, as well as a
// mysterious dcX with no nodes with known coordinates.
func testCluster(self string) *mockCluster {
c := newMockCluster(self)
c.AddMember("dc0", "node0", lib.GenerateCoordinate(10*time.Millisecond))
c.AddMember("dc1", "node1", lib.GenerateCoordinate(3*time.Millisecond))
c.AddMember("dc1", "node2", lib.GenerateCoordinate(2*time.Millisecond))
c.AddMember("dc1", "node3", lib.GenerateCoordinate(5*time.Millisecond))
c.AddMember("dc1", "node4", nil)
c.AddMember("dc2", "node1", lib.GenerateCoordinate(8*time.Millisecond))
c.AddMember("dcX", "node1", nil)
return c
}
func testRouter(t testing.TB, dc string) *Router {
logger := testutil.Logger(t)
return NewRouter(logger, dc, "", nil)
}
func TestRouter_Shutdown(t *testing.T) {
r := testRouter(t, "dc0")
// Create a WAN-looking area.
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
// Add another area.
otherID := types.AreaID("other")
other := newMockCluster(self)
other.AddMember("dcY", "node1", nil)
if err := r.AddArea(otherID, other, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
_, _, ok := r.FindRoute("dcY")
if !ok {
t.Fatalf("bad")
}
// Shutdown and make sure we can't see any routes from before.
r.Shutdown()
_, _, ok = r.FindRoute("dcY")
if ok {
t.Fatalf("bad")
}
// You can't add areas once the router is shut down.
err := r.AddArea(otherID, other, &fauxConnPool{})
if err == nil || !strings.Contains(err.Error(), "router is shut down") {
t.Fatalf("err: %v", err)
}
}
func TestRouter_Routing(t *testing.T) {
r := testRouter(t, "dc0")
// Create a WAN-looking area.
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
// Adding the area should enable all the routes right away.
if _, _, ok := r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc2"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcX"); !ok {
t.Fatalf("bad")
}
// This hasn't been added yet.
if _, _, ok := r.FindRoute("dcY"); ok {
t.Fatalf("bad")
}
// Add another area.
otherID := types.AreaID("other")
other := newMockCluster(self)
other.AddMember("dc0", "node0", nil)
other.AddMember("dc1", "node1", nil)
other.AddMember("dcY", "node1", nil)
if err := r.AddArea(otherID, other, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
// Now we should have a route to every DC.
if _, _, ok := r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc2"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcX"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcY"); !ok {
t.Fatalf("bad")
}
// Get the route for dcY and then fail the server. This will still
// give the server back since we have no other choice.
_, s, ok := r.FindRoute("dcY")
if !ok {
t.Fatalf("bad")
}
if err := r.FailServer(otherID, s); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok := r.FindRoute("dcY"); !ok {
t.Fatalf("bad")
}
// But if we remove the server we won't get a route.
if err := r.RemoveServer(otherID, s); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok := r.FindRoute("dcY"); ok {
t.Fatalf("bad")
}
// Make sure the dcY manager also got removed from the area and from
// the index we use for routing.
func() {
r.RLock()
defer r.RUnlock()
area, ok := r.areas[otherID]
if !ok {
t.Fatalf("bad")
}
if _, ok := area.managers["dcY"]; ok {
t.Fatalf("bad")
}
if _, ok := r.managers["dcY"]; ok {
t.Fatalf("bad")
}
}()
// Do similar for dc0, which will take two removes because the dc0 is
// reachable from two different areas.
_, s, ok = r.FindRoute("dc0")
if !ok {
t.Fatalf("bad")
}
if err := r.RemoveServer(types.AreaWAN, s); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok = r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if err := r.RemoveServer(otherID, s); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok = r.FindRoute("dc0"); ok {
t.Fatalf("bad")
}
// Now delete some areas.
if _, _, ok = r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if err := r.RemoveArea(types.AreaWAN); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok = r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if err := r.RemoveArea(otherID); err != nil {
t.Fatalf("err: %v", err)
}
if _, _, ok = r.FindRoute("dc1"); ok {
t.Fatalf("bad")
}
}
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func TestRouter_Routing_Offline(t *testing.T) {
r := testRouter(t, "dc0")
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// Create a WAN-looking area.
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{1.0}); err != nil {
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t.Fatalf("err: %v", err)
}
// Adding the area should enable all the routes right away.
if _, _, ok := r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc2"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcX"); !ok {
t.Fatalf("bad")
}
// Do a rebalance for dc1, which should knock it offline.
func() {
r.Lock()
defer r.Unlock()
area, ok := r.areas[types.AreaWAN]
if !ok {
t.Fatalf("bad")
}
info, ok := area.managers["dc1"]
if !ok {
t.Fatalf("bad")
}
info.manager.RebalanceServers()
}()
// Recheck all the routes.
if _, _, ok := r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc1"); ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc2"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcX"); !ok {
t.Fatalf("bad")
}
// Add another area with a route to dc1.
otherID := types.AreaID("other")
other := newMockCluster(self)
other.AddMember("dc0", "node0", nil)
other.AddMember("dc1", "node1", nil)
if err := r.AddArea(otherID, other, &fauxConnPool{}); err != nil {
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t.Fatalf("err: %v", err)
}
// Recheck all the routes and make sure it finds the one that's
// online.
if _, _, ok := r.FindRoute("dc0"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc1"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dc2"); !ok {
t.Fatalf("bad")
}
if _, _, ok := r.FindRoute("dcX"); !ok {
t.Fatalf("bad")
}
}
func TestRouter_GetDatacenters(t *testing.T) {
r := testRouter(t, "dc0")
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
actual := r.GetDatacenters()
expected := []string{"dc0", "dc1", "dc2", "dcX"}
if !reflect.DeepEqual(actual, expected) {
t.Fatalf("bad: %#v", actual)
}
}
func TestRouter_distanceSorter(t *testing.T) {
actual := &datacenterSorter{
Names: []string{"foo", "bar", "baz", "zoo"},
Vec: []float64{3.0, 1.0, 1.0, 0.0},
}
sort.Stable(actual)
expected := &datacenterSorter{
Names: []string{"zoo", "bar", "baz", "foo"},
Vec: []float64{0.0, 1.0, 1.0, 3.0},
}
if !reflect.DeepEqual(actual, expected) {
t.Fatalf("bad: %#v", *expected)
}
}
func TestRouter_GetDatacentersByDistance(t *testing.T) {
r := testRouter(t, "dc0")
// Start with just the WAN area described in the diagram above.
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
actual, err := r.GetDatacentersByDistance()
if err != nil {
t.Fatalf("err: %v", err)
}
expected := []string{"dc0", "dc2", "dc1", "dcX"}
if !reflect.DeepEqual(actual, expected) {
t.Fatalf("bad: %#v", actual)
}
// Now add another area with a closer route for dc1.
otherID := types.AreaID("other")
other := newMockCluster(self)
other.AddMember("dc0", "node0", lib.GenerateCoordinate(20*time.Millisecond))
other.AddMember("dc1", "node1", lib.GenerateCoordinate(21*time.Millisecond))
if err := r.AddArea(otherID, other, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
actual, err = r.GetDatacentersByDistance()
if err != nil {
t.Fatalf("err: %v", err)
}
expected = []string{"dc0", "dc1", "dc2", "dcX"}
if !reflect.DeepEqual(actual, expected) {
t.Fatalf("bad: %#v", actual)
}
}
func TestRouter_GetDatacenterMaps(t *testing.T) {
r := testRouter(t, "dc0")
self := "node0.dc0"
wan := testCluster(self)
if err := r.AddArea(types.AreaWAN, wan, &fauxConnPool{}); err != nil {
t.Fatalf("err: %v", err)
}
actual, err := r.GetDatacenterMaps()
if err != nil {
t.Fatalf("err: %v", err)
}
if len(actual) != 3 {
t.Fatalf("bad: %#v", actual)
}
for _, entry := range actual {
switch entry.Datacenter {
case "dc0":
if !reflect.DeepEqual(entry, structs.DatacenterMap{
Datacenter: "dc0",
AreaID: types.AreaWAN,
Coordinates: structs.Coordinates{
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&structs.Coordinate{
Node: "node0.dc0",
Coord: lib.GenerateCoordinate(10 * time.Millisecond),
},
},
}) {
t.Fatalf("bad: %#v", entry)
}
case "dc1":
if !reflect.DeepEqual(entry, structs.DatacenterMap{
Datacenter: "dc1",
AreaID: types.AreaWAN,
Coordinates: structs.Coordinates{
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&structs.Coordinate{
Node: "node1.dc1",
Coord: lib.GenerateCoordinate(3 * time.Millisecond),
},
&structs.Coordinate{
Node: "node2.dc1",
Coord: lib.GenerateCoordinate(2 * time.Millisecond),
},
&structs.Coordinate{
Node: "node3.dc1",
Coord: lib.GenerateCoordinate(5 * time.Millisecond),
},
},
}) {
t.Fatalf("bad: %#v", entry)
}
case "dc2":
if !reflect.DeepEqual(entry, structs.DatacenterMap{
Datacenter: "dc2",
AreaID: types.AreaWAN,
Coordinates: structs.Coordinates{
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&structs.Coordinate{
Node: "node1.dc2",
Coord: lib.GenerateCoordinate(8 * time.Millisecond),
},
},
}) {
t.Fatalf("bad: %#v", entry)
}
default:
t.Fatalf("bad: %#v", entry)
}
}
}
func TestRouter_FindLANServer(t *testing.T) {
r := testRouter(t, "dc0")
lan := newMockCluster("node4.dc0")
lan.AddLANMember("dc0", "node0", "consul", lib.GenerateCoordinate(10*time.Millisecond))
lan.AddLANMember("dc0", "node1", "", lib.GenerateCoordinate(20*time.Millisecond))
lan.AddLANMember("dc0", "node2", "", lib.GenerateCoordinate(21*time.Millisecond))
require.NoError(t, r.AddArea(types.AreaLAN, lan, &fauxConnPool{}))
srv := r.FindLANServer()
require.NotNil(t, srv)
require.Equal(t, "127.0.0.1:8300", srv.Addr.String())
mgr, srv2 := r.FindLANRoute()
require.NotNil(t, mgr)
require.Equal(t, srv, srv2)
}