fixes: use multiple sync messages if we hit ttrpc max message limit.

go.mod

@@ -3,21 +3,23 @@ module github.com/containerd/nri
 go 1.21
 
 require (
-	github.com/containerd/ttrpc v1.2.3
+	github.com/containerd/ttrpc v1.2.6-0.20240827082320-b5cd6e4b3287
 	github.com/moby/sys/mountinfo v0.6.2
 	github.com/onsi/ginkgo/v2 v2.19.1
 	github.com/onsi/gomega v1.34.0
 	github.com/opencontainers/runtime-spec v1.0.3-0.20220825212826-86290f6a00fb
 	github.com/opencontainers/runtime-tools v0.9.0
-	github.com/sirupsen/logrus v1.8.1
+	github.com/sirupsen/logrus v1.9.3
 	github.com/stretchr/testify v1.8.4
 	golang.org/x/sys v0.21.0
+	google.golang.org/grpc v1.57.1
 	google.golang.org/protobuf v1.34.1
 	k8s.io/cri-api v0.25.3
 	sigs.k8s.io/yaml v1.3.0
 )
 
 require (
+	github.com/containerd/log v0.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
@@ -31,7 +33,6 @@ require (
 	golang.org/x/text v0.15.0 // indirect
 	golang.org/x/tools v0.21.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230731190214-cbb8c96f2d6d // indirect
-	google.golang.org/grpc v1.57.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,7 +1,9 @@
 github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
 github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
-github.com/containerd/ttrpc v1.2.3 h1:4jlhbXIGvijRtNC8F/5CpuJZ7yKOBFGFOOXg1bkISz0=
-github.com/containerd/ttrpc v1.2.3/go.mod h1:ieWsXucbb8Mj9PH0rXCw1i8IunRbbAiDkpXkbfflWBM=
+github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I=
+github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo=
+github.com/containerd/ttrpc v1.2.6-0.20240827082320-b5cd6e4b3287 h1:zwv64tCdT888KxuXQuv5i36cEdljoXq3sVqLmOEbCQI=
+github.com/containerd/ttrpc v1.2.6-0.20240827082320-b5cd6e4b3287/go.mod h1:YCXHsb32f+Sq5/72xHubdiJRQY9inL4a4ZQrAbN1q9o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -48,11 +50,13 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
-github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
 github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 h1:kdXcSzyDtseVEc4yCz2qF8ZrQvIDBJLl4S1c3GCXmoI=
@@ -86,6 +90,7 @@ golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191115151921-52ab43148777/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -115,6 +120,7 @@ gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8X
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 k8s.io/cri-api v0.25.3 h1:YaiQ05CM4+5L2DAz0KoSa4sv4/VlQvLbf3WHKICPSXs=

pkg/adaptation/plugin.go

@@ -33,6 +33,8 @@ import (
 	"github.com/containerd/nri/pkg/net"
 	"github.com/containerd/nri/pkg/net/multiplex"
 	"github.com/containerd/ttrpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 const (
@@ -414,19 +416,101 @@ func (p *plugin) synchronize(ctx context.Context, pods []*PodSandbox, containers
 	ctx, cancel := context.WithTimeout(ctx, getPluginRequestTimeout())
 	defer cancel()
 
-	req := &SynchronizeRequest{
-		Pods:       pods,
-		Containers: containers,
-	}
-	rpl, err := p.stub.Synchronize(ctx, req)
-	if err != nil {
-		p.close()
-		return nil, err
+	var (
+		podsToSend = pods
+		ctrsToSend = containers
+		podsPerMsg = len(pods)
+		ctrsPerMsg = len(containers)
+
+		rpl *SynchronizeResponse
+		err error
+	)
+
+	for {
+		req := &SynchronizeRequest{
+			Pods:       podsToSend[:podsPerMsg],
+			Containers: ctrsToSend[:ctrsPerMsg],
+			More:       len(podsToSend) > podsPerMsg || len(ctrsToSend) > ctrsPerMsg,
+		}
+
+		log.Debugf(ctx, "sending sync message, %d/%d, %d/%d (more: %v)",
+			len(req.Pods), len(podsToSend), len(req.Containers), len(ctrsToSend), req.More)
+
+		rpl, err = p.stub.Synchronize(ctx, req)
+		if err == nil {
+			if !req.More {
+				break
+			}
+
+			if len(rpl.Update) > 0 || rpl.More != req.More {
+				p.close()
+				return nil, fmt.Errorf("plugin does not handle split sync requests")
+			}
+
+			podsToSend = podsToSend[podsPerMsg:]
+			ctrsToSend = ctrsToSend[ctrsPerMsg:]
+
+			if podsPerMsg > len(podsToSend) {
+				podsPerMsg = len(podsToSend)
+			}
+			if ctrsPerMsg > len(ctrsToSend) {
+				ctrsPerMsg = len(ctrsToSend)
+			}
+		} else {
+			podsPerMsg, ctrsPerMsg, err = recalcObjsPerSyncMsg(podsPerMsg, ctrsPerMsg, err)
+			if err != nil {
+				p.close()
+				return nil, err
+			}
+
+			log.Debugf(ctx, "oversized message, retrying in smaller chunks")
+		}
 	}
 
 	return rpl.Update, nil
 }
 
+func recalcObjsPerSyncMsg(pods, ctrs int, err error) (int, int, error) {
+	const (
+		minObjsPerMsg = 8
+	)
+
+	if status.Code(err) != codes.ResourceExhausted {
+		return pods, ctrs, err
+	}
+
+	if pods+ctrs <= minObjsPerMsg {
+		return pods, ctrs, fmt.Errorf("failed to synchronize plugin with split messages")
+	}
+
+	var e *ttrpc.OversizedMessageErr
+	if !errors.As(err, &e) {
+		return pods, ctrs, fmt.Errorf("failed to synchronize plugin with split messages")
+	}
+
+	maxLen := e.MaximumLength()
+	msgLen := e.RejectedLength()
+
+	if msgLen == 0 || maxLen == 0 || msgLen <= maxLen {
+		return pods, ctrs, fmt.Errorf("failed to synchronize plugin with split messages")
+	}
+
+	factor := float64(maxLen) / float64(msgLen)
+	if factor > 0.9 {
+		factor = 0.9
+	}
+
+	pods = int(float64(pods) * factor)
+	ctrs = int(float64(ctrs) * factor)
+
+	if pods+ctrs < minObjsPerMsg {
+		pods = minObjsPerMsg / 2
+		ctrs = minObjsPerMsg / 2
+	}
+
+	return pods, ctrs, nil
+}
+
 // Relay CreateContainer request to plugin.
 func (p *plugin) createContainer(ctx context.Context, req *CreateContainerRequest) (*CreateContainerResponse, error) {
 	if !p.events.IsSet(Event_CREATE_CONTAINER) {