server: test the deadlock between LinearCache and SOTW server (#530)

Signed-off-by: Rueian <[email protected]>

Author: rueian

pkg/server/v3/server_test.go

@@ -18,8 +18,11 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math/rand"
 	"reflect"
+	"strconv"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -667,3 +670,63 @@ func TestCallbackError(t *testing.T) {
 		})
 	}
 }
+
+func TestSOTWLinearCacheIntegrationDeadLock(t *testing.T) {
+	for _, typ := range testTypes {
+		t.Run(typ, func(t *testing.T) {
+			t.Log("Integrating LinearCache with SOTW server. If this take too long, they might be dead locked")
+
+			nonce := int64(0)
+			ver, targetVer := uint64(0), uint64(100000)
+			untilVerExceed := func(exceed uint64, fn func(current uint64)) {
+				for current := atomic.LoadUint64(&ver); current < exceed; current = atomic.LoadUint64(&ver) {
+					fn(current)
+				}
+			}
+
+			config := cache.NewLinearCache(typ)
+			s := server.NewServer(context.Background(), config, server.CallbackFuncs{})
+
+			resources := make([]string, 10)
+			for i := range resources {
+				resources[i] = strconv.Itoa(i)
+			}
+
+			mStream := makeMockStream(t)
+
+			go func() {
+				untilVerExceed(targetVer, func(current uint64) {
+					mStream.recv <- &discovery.DiscoveryRequest{
+						Node:          node,
+						TypeUrl:       typ,
+						ResourceNames: resources,
+						VersionInfo:   strconv.FormatUint(current, 10),
+						ResponseNonce: strconv.FormatInt(atomic.LoadInt64(&nonce), 10),
+					}
+				})
+				close(mStream.recv)
+			}()
+
+			go func() {
+				untilVerExceed(targetVer, func(current uint64) {
+					config.SetResources(map[string]types.Resource{
+						resources[rand.Intn(len(resources))]: opaque, //nolint
+					})
+				})
+			}()
+
+			go func() {
+				for resp := range mStream.sent {
+					v, _ := strconv.ParseUint(resp.VersionInfo, 10, 64)
+					atomic.StoreUint64(&ver, v)
+					n, _ := strconv.ParseInt(resp.Nonce, 10, 64)
+					atomic.StoreInt64(&nonce, n)
+				}
+			}()
+
+			err := s.StreamAggregatedResources(mStream)
+			assert.Nil(t, err)
+			close(mStream.sent)
+		})
+	}
+}