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watchers_endpoints_test.go
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watchers_endpoints_test.go
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/*
*
* Copyright 2020 gRPC 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:https://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 xdsclient
import (
"context"
"fmt"
"testing"
"github.com/google/go-cmp/cmp"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/grpc/internal/testutils"
"google.golang.org/grpc/xds/internal"
)
var (
testLocalities = []Locality{
{
Endpoints: []Endpoint{{Address: "addr1:314"}},
ID: internal.LocalityID{SubZone: "locality-1"},
Priority: 1,
Weight: 1,
},
{
Endpoints: []Endpoint{{Address: "addr2:159"}},
ID: internal.LocalityID{SubZone: "locality-2"},
Priority: 0,
Weight: 1,
},
}
)
// TestEndpointsWatch covers the cases:
// - an update is received after a watch()
// - an update for another resource name (which doesn't trigger callback)
// - an update is received after cancel()
func (s) TestEndpointsWatch(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
endpointsUpdateCh := testutils.NewChannel()
cancelWatch := client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
wantUpdate := EndpointsUpdate{Localities: []Locality{testLocalities[0]}}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: wantUpdate}}, UpdateMetadata{})
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh, wantUpdate, nil); err != nil {
t.Fatal(err)
}
// Push an update, with an extra resource for a different resource name.
// Specify a non-nil raw proto in the original resource to ensure that the
// new update is not considered equal to the old one.
newUpdate := wantUpdate
newUpdate.Raw = &anypb.Any{}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{
testCDSName: {Update: newUpdate},
"randomName": {},
}, UpdateMetadata{})
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh, newUpdate, nil); err != nil {
t.Fatal(err)
}
// Cancel watch, and send update again.
cancelWatch()
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: wantUpdate}}, UpdateMetadata{})
sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
defer sCancel()
if u, err := endpointsUpdateCh.Receive(sCtx); err != context.DeadlineExceeded {
t.Errorf("unexpected endpointsUpdate: %v, %v, want channel recv timeout", u, err)
}
}
// TestEndpointsTwoWatchSameResourceName covers the case where an update is received
// after two watch() for the same resource name.
func (s) TestEndpointsTwoWatchSameResourceName(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
const count = 2
var (
endpointsUpdateChs []*testutils.Channel
cancelLastWatch func()
)
for i := 0; i < count; i++ {
endpointsUpdateCh := testutils.NewChannel()
endpointsUpdateChs = append(endpointsUpdateChs, endpointsUpdateCh)
cancelLastWatch = client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if i == 0 {
// A new watch is registered on the underlying API client only for
// the first iteration because we are using the same resource name.
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
}
}
wantUpdate := EndpointsUpdate{Localities: []Locality{testLocalities[0]}}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: wantUpdate}}, UpdateMetadata{})
for i := 0; i < count; i++ {
if err := verifyEndpointsUpdate(ctx, endpointsUpdateChs[i], wantUpdate, nil); err != nil {
t.Fatal(err)
}
}
// Cancel the last watch, and send update again. None of the watchers should
// be notified because one has been cancelled, and the other is receiving
// the same update.
cancelLastWatch()
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: wantUpdate}}, UpdateMetadata{})
for i := 0; i < count; i++ {
func() {
sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
defer sCancel()
if u, err := endpointsUpdateChs[i].Receive(sCtx); err != context.DeadlineExceeded {
t.Errorf("unexpected endpointsUpdate: %v, %v, want channel recv timeout", u, err)
}
}()
}
// Push a new update and make sure the uncancelled watcher is invoked.
// Specify a non-nil raw proto to ensure that the new update is not
// considered equal to the old one.
newUpdate := EndpointsUpdate{Localities: []Locality{testLocalities[0]}, Raw: &anypb.Any{}}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: newUpdate}}, UpdateMetadata{})
if err := verifyEndpointsUpdate(ctx, endpointsUpdateChs[0], newUpdate, nil); err != nil {
t.Fatal(err)
}
}
// TestEndpointsThreeWatchDifferentResourceName covers the case where an update is
// received after three watch() for different resource names.
func (s) TestEndpointsThreeWatchDifferentResourceName(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
// Two watches for the same name.
var endpointsUpdateChs []*testutils.Channel
const count = 2
for i := 0; i < count; i++ {
endpointsUpdateCh := testutils.NewChannel()
endpointsUpdateChs = append(endpointsUpdateChs, endpointsUpdateCh)
client.WatchEndpoints(testCDSName+"1", func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if i == 0 {
// A new watch is registered on the underlying API client only for
// the first iteration because we are using the same resource name.
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
}
}
// Third watch for a different name.
endpointsUpdateCh2 := testutils.NewChannel()
client.WatchEndpoints(testCDSName+"2", func(update EndpointsUpdate, err error) {
endpointsUpdateCh2.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
wantUpdate1 := EndpointsUpdate{Localities: []Locality{testLocalities[0]}}
wantUpdate2 := EndpointsUpdate{Localities: []Locality{testLocalities[1]}}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{
testCDSName + "1": {Update: wantUpdate1},
testCDSName + "2": {Update: wantUpdate2},
}, UpdateMetadata{})
for i := 0; i < count; i++ {
if err := verifyEndpointsUpdate(ctx, endpointsUpdateChs[i], wantUpdate1, nil); err != nil {
t.Fatal(err)
}
}
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh2, wantUpdate2, nil); err != nil {
t.Fatal(err)
}
}
// TestEndpointsWatchAfterCache covers the case where watch is called after the update
// is in cache.
func (s) TestEndpointsWatchAfterCache(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
endpointsUpdateCh := testutils.NewChannel()
client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
wantUpdate := EndpointsUpdate{Localities: []Locality{testLocalities[0]}}
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Update: wantUpdate}}, UpdateMetadata{})
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh, wantUpdate, nil); err != nil {
t.Fatal(err)
}
// Another watch for the resource in cache.
endpointsUpdateCh2 := testutils.NewChannel()
client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh2.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
defer sCancel()
if n, err := apiClient.addWatches[EndpointsResource].Receive(sCtx); err != context.DeadlineExceeded {
t.Fatalf("want no new watch to start (recv timeout), got resource name: %v error %v", n, err)
}
// New watch should receives the update.
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh2, wantUpdate, nil); err != nil {
t.Fatal(err)
}
// Old watch should see nothing.
sCtx, sCancel = context.WithTimeout(ctx, defaultTestShortTimeout)
defer sCancel()
if u, err := endpointsUpdateCh.Receive(sCtx); err != context.DeadlineExceeded {
t.Errorf("unexpected endpointsUpdate: %v, %v, want channel recv timeout", u, err)
}
}
// TestEndpointsWatchExpiryTimer tests the case where the client does not receive
// an CDS response for the request that it sends out. We want the watch callback
// to be invoked with an error once the watchExpiryTimer fires.
func (s) TestEndpointsWatchExpiryTimer(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, true))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
endpointsUpdateCh := testutils.NewChannel()
client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
u, err := endpointsUpdateCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for endpoints update: %v", err)
}
gotUpdate := u.(EndpointsUpdateErrTuple)
if gotUpdate.Err == nil || !cmp.Equal(gotUpdate.Update, EndpointsUpdate{}) {
t.Fatalf("unexpected endpointsUpdate: (%v, %v), want: (EndpointsUpdate{}, nil)", gotUpdate.Update, gotUpdate.Err)
}
}
// TestEndpointsWatchNACKError covers the case that an update is NACK'ed, and
// the watcher should also receive the error.
func (s) TestEndpointsWatchNACKError(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
endpointsUpdateCh := testutils.NewChannel()
cancelWatch := client.WatchEndpoints(testCDSName, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
defer cancelWatch()
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
wantError := fmt.Errorf("testing error")
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{testCDSName: {Err: wantError}}, UpdateMetadata{ErrState: &UpdateErrorMetadata{Err: wantError}})
if err := verifyEndpointsUpdate(ctx, endpointsUpdateCh, EndpointsUpdate{}, wantError); err != nil {
t.Fatal(err)
}
}
// TestEndpointsWatchPartialValid covers the case that a response contains both
// valid and invalid resources. This response will be NACK'ed by the xdsclient.
// But the watchers with valid resources should receive the update, those with
// invalida resources should receive an error.
func (s) TestEndpointsWatchPartialValid(t *testing.T) {
apiClientCh, cleanup := overrideNewAPIClient()
defer cleanup()
client, err := newWithConfig(clientOpts(testXDSServer, false))
if err != nil {
t.Fatalf("failed to create client: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
c, err := apiClientCh.Receive(ctx)
if err != nil {
t.Fatalf("timeout when waiting for API client to be created: %v", err)
}
apiClient := c.(*testAPIClient)
const badResourceName = "bad-resource"
updateChs := make(map[string]*testutils.Channel)
for _, name := range []string{testCDSName, badResourceName} {
endpointsUpdateCh := testutils.NewChannel()
cancelWatch := client.WatchEndpoints(name, func(update EndpointsUpdate, err error) {
endpointsUpdateCh.Send(EndpointsUpdateErrTuple{Update: update, Err: err})
})
defer func() {
cancelWatch()
if _, err := apiClient.removeWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want watch to be canceled, got err: %v", err)
}
}()
if _, err := apiClient.addWatches[EndpointsResource].Receive(ctx); err != nil {
t.Fatalf("want new watch to start, got error %v", err)
}
updateChs[name] = endpointsUpdateCh
}
wantError := fmt.Errorf("testing error")
wantError2 := fmt.Errorf("individual error")
client.NewEndpoints(map[string]EndpointsUpdateErrTuple{
testCDSName: {Update: EndpointsUpdate{Localities: []Locality{testLocalities[0]}}},
badResourceName: {Err: wantError2},
}, UpdateMetadata{ErrState: &UpdateErrorMetadata{Err: wantError}})
// The valid resource should be sent to the watcher.
if err := verifyEndpointsUpdate(ctx, updateChs[testCDSName], EndpointsUpdate{Localities: []Locality{testLocalities[0]}}, nil); err != nil {
t.Fatal(err)
}
// The failed watcher should receive an error.
if err := verifyEndpointsUpdate(ctx, updateChs[badResourceName], EndpointsUpdate{}, wantError2); err != nil {
t.Fatal(err)
}
}