267 lines
8.9 KiB
Go
267 lines
8.9 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package egressselector
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"testing"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/clock"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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"k8s.io/apiserver/pkg/apis/apiserver"
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"k8s.io/apiserver/pkg/server/egressselector/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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"k8s.io/component-base/metrics/testutil"
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)
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type fakeEgressSelection struct {
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directDialerCalled bool
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}
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func TestEgressSelector(t *testing.T) {
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testcases := []struct {
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name string
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input *apiserver.EgressSelectorConfiguration
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services []struct {
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egressType EgressType
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validateDialer func(dialer utilnet.DialFunc, s *fakeEgressSelection) (bool, error)
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lookupError *string
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dialerError *string
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}
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expectedError *string
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}{
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{
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name: "direct",
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input: &apiserver.EgressSelectorConfiguration{
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TypeMeta: metav1.TypeMeta{
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Kind: "",
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APIVersion: "",
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},
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EgressSelections: []apiserver.EgressSelection{
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{
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Name: "cluster",
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Connection: apiserver.Connection{
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ProxyProtocol: apiserver.ProtocolDirect,
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},
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},
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{
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Name: "master",
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Connection: apiserver.Connection{
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ProxyProtocol: apiserver.ProtocolDirect,
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},
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},
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{
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Name: "etcd",
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Connection: apiserver.Connection{
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ProxyProtocol: apiserver.ProtocolDirect,
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},
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},
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},
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},
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services: []struct {
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egressType EgressType
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validateDialer func(dialer utilnet.DialFunc, s *fakeEgressSelection) (bool, error)
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lookupError *string
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dialerError *string
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}{
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{
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Cluster,
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validateDirectDialer,
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nil,
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nil,
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},
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{
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ControlPlane,
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validateDirectDialer,
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nil,
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nil,
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},
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{
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Etcd,
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validateDirectDialer,
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nil,
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nil,
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},
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},
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expectedError: nil,
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},
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}
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for _, tc := range testcases {
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t.Run(tc.name, func(t *testing.T) {
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// Setup the various pieces such as the fake dialer prior to initializing the egress selector.
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// Go doesn't allow function pointer comparison, nor does its reflect package
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// So overriding the default dialer to detect if it is returned.
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fake := &fakeEgressSelection{}
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directDialer = fake.fakeDirectDialer
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cs, err := NewEgressSelector(tc.input)
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if err == nil && tc.expectedError != nil {
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t.Errorf("calling NewEgressSelector expected error: %s, did not get it", *tc.expectedError)
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}
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if err != nil && tc.expectedError == nil {
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t.Errorf("unexpected error calling NewEgressSelector got: %#v", err)
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}
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if err != nil && tc.expectedError != nil && err.Error() != *tc.expectedError {
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t.Errorf("calling NewEgressSelector expected error: %s, got %#v", *tc.expectedError, err)
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}
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for _, service := range tc.services {
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networkContext := NetworkContext{EgressSelectionName: service.egressType}
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dialer, lookupErr := cs.Lookup(networkContext)
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if lookupErr == nil && service.lookupError != nil {
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t.Errorf("calling Lookup expected error: %s, did not get it", *service.lookupError)
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}
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if lookupErr != nil && service.lookupError == nil {
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t.Errorf("unexpected error calling Lookup got: %#v", lookupErr)
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}
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if lookupErr != nil && service.lookupError != nil && lookupErr.Error() != *service.lookupError {
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t.Errorf("calling Lookup expected error: %s, got %#v", *service.lookupError, lookupErr)
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}
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fake.directDialerCalled = false
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ok, dialerErr := service.validateDialer(dialer, fake)
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if dialerErr == nil && service.dialerError != nil {
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t.Errorf("calling Lookup expected error: %s, did not get it", *service.dialerError)
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}
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if dialerErr != nil && service.dialerError == nil {
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t.Errorf("unexpected error calling Lookup got: %#v", dialerErr)
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}
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if dialerErr != nil && service.dialerError != nil && dialerErr.Error() != *service.dialerError {
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t.Errorf("calling Lookup expected error: %s, got %#v", *service.dialerError, dialerErr)
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}
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if !ok {
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t.Errorf("Could not validate dialer for service %q", service.egressType)
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}
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}
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})
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}
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}
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func (s *fakeEgressSelection) fakeDirectDialer(ctx context.Context, network, address string) (net.Conn, error) {
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s.directDialerCalled = true
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return nil, nil
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}
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func validateDirectDialer(dialer utilnet.DialFunc, s *fakeEgressSelection) (bool, error) {
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conn, err := dialer(context.Background(), "tcp", "127.0.0.1:8080")
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if err != nil {
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return false, err
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}
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if conn != nil {
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return false, nil
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}
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return s.directDialerCalled, nil
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}
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type fakeProxyServerConnector struct {
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connectorErr bool
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proxierErr bool
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}
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func (f *fakeProxyServerConnector) connect() (proxier, error) {
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if f.connectorErr {
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return nil, fmt.Errorf("fake error")
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}
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return &fakeProxier{err: f.proxierErr}, nil
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}
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type fakeProxier struct {
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err bool
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}
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func (f *fakeProxier) proxy(_ context.Context, _ string) (net.Conn, error) {
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if f.err {
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return nil, fmt.Errorf("fake error")
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}
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return nil, nil
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}
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func TestMetrics(t *testing.T) {
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testcases := map[string]struct {
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connectorErr bool
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proxierErr bool
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metrics []string
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want string
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}{
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"connect to proxy server error": {
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connectorErr: true,
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proxierErr: false,
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metrics: []string{"apiserver_egress_dialer_dial_failure_count"},
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want: `
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# HELP apiserver_egress_dialer_dial_failure_count [ALPHA] Dial failure count, labeled by the protocol (http-connect or grpc), transport (tcp or uds), and stage (connect or proxy). The stage indicates at which stage the dial failed
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# TYPE apiserver_egress_dialer_dial_failure_count counter
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apiserver_egress_dialer_dial_failure_count{protocol="fake_protocol",stage="connect",transport="fake_transport"} 1
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`,
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},
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"connect succeeded, proxy failed": {
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connectorErr: false,
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proxierErr: true,
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metrics: []string{"apiserver_egress_dialer_dial_failure_count"},
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want: `
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# HELP apiserver_egress_dialer_dial_failure_count [ALPHA] Dial failure count, labeled by the protocol (http-connect or grpc), transport (tcp or uds), and stage (connect or proxy). The stage indicates at which stage the dial failed
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# TYPE apiserver_egress_dialer_dial_failure_count counter
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apiserver_egress_dialer_dial_failure_count{protocol="fake_protocol",stage="proxy",transport="fake_transport"} 1
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`,
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},
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"successful": {
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connectorErr: false,
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proxierErr: false,
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metrics: []string{"apiserver_egress_dialer_dial_duration_seconds"},
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want: `
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# HELP apiserver_egress_dialer_dial_duration_seconds [ALPHA] Dial latency histogram in seconds, labeled by the protocol (http-connect or grpc), transport (tcp or uds)
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# TYPE apiserver_egress_dialer_dial_duration_seconds histogram
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="0.005"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="0.025"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="0.1"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="0.5"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="2.5"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="12.5"} 1
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apiserver_egress_dialer_dial_duration_seconds_bucket{protocol="fake_protocol",transport="fake_transport",le="+Inf"} 1
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apiserver_egress_dialer_dial_duration_seconds_sum{protocol="fake_protocol",transport="fake_transport"} 0
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apiserver_egress_dialer_dial_duration_seconds_count{protocol="fake_protocol",transport="fake_transport"} 1
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`,
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},
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}
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for tn, tc := range testcases {
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t.Run(tn, func(t *testing.T) {
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metrics.Metrics.Reset()
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metrics.Metrics.SetClock(clock.NewFakeClock(time.Now()))
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d := dialerCreator{
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connector: &fakeProxyServerConnector{
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connectorErr: tc.connectorErr,
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proxierErr: tc.proxierErr,
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},
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options: metricsOptions{
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transport: "fake_transport",
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protocol: "fake_protocol",
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},
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}
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dialer := d.createDialer()
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dialer(context.TODO(), "", "")
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if err := testutil.GatherAndCompare(legacyregistry.DefaultGatherer, strings.NewReader(tc.want), tc.metrics...); err != nil {
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t.Errorf("Err in comparing metrics %v", err)
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}
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})
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}
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}
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