Add LLMResponse object and RequestId to LLMRequest

pkg/epp/requestcontrol/director.go

@@ -31,6 +31,7 @@ import (
 	schedulingtypes "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/scheduling/types"
 	errutil "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/util/error"
 	logutil "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/util/logging"
+	requtil "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/util/request"
 )
 
 type Scheduler interface {
@@ -82,6 +83,7 @@ func (d *Director) HandleRequest(ctx context.Context, reqCtx *handlers.RequestCo
 	}
 
 	llmReq := &schedulingtypes.LLMRequest{
+		RequestId:           reqCtx.Request.Headers[requtil.RequestIdHeaderKey],
 		Model:               reqCtx.Model,
 		ResolvedTargetModel: reqCtx.ResolvedTargetModel,
 		Critical:            modelObj.Spec.Criticality != nil && *modelObj.Spec.Criticality == v1alpha2.Critical,

pkg/epp/scheduling/plugins/filter/filter_test.go

@@ -21,6 +21,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+	"github.com/google/uuid"
 	k8stypes "k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend"
 	backendmetrics "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend/metrics"
@@ -52,7 +53,7 @@ func TestFilter(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			ctx := types.NewSchedulingContext(context.Background(), test.req, test.input)
+			ctx := types.NewSchedulingContext(context.Background(), test.req, nil, test.input)
 			got := test.filter.Filter(ctx, test.input)
 
 			if diff := cmp.Diff(test.output, got); diff != "" {
@@ -187,7 +188,7 @@ func TestFilterFunc(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			ctx := types.NewSchedulingContext(context.Background(), test.req, test.input)
+			ctx := types.NewSchedulingContext(context.Background(), test.req, nil, test.input)
 			got := test.f(ctx, test.input)
 
 			if diff := cmp.Diff(test.output, got); diff != "" {
@@ -221,6 +222,7 @@ func TestLoRASoftAffinityDistribution(t *testing.T) {
 
 	// Create a test request and pods
 	req := &types.LLMRequest{
+		RequestId:           uuid.NewString(),
 		Model:               testAffinityModel,
 		ResolvedTargetModel: testAffinityModel,
 	}
@@ -244,7 +246,7 @@ func TestLoRASoftAffinityDistribution(t *testing.T) {
 			},
 		},
 	}
-	ctx := types.NewSchedulingContext(context.Background(), req, pods)
+	ctx := types.NewSchedulingContext(context.Background(), req, nil, pods)
 
 	// Run the filter function multiple times and count the results
 	affinityCount := 0

pkg/epp/scheduling/plugins/scorer/kvcache_test.go

@@ -82,7 +82,7 @@ func TestKvCacheScorer(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			ctx := types.NewSchedulingContext(context.Background(), &types.LLMRequest{}, tt.pods)
+			ctx := types.NewSchedulingContext(context.Background(), &types.LLMRequest{}, nil, tt.pods)
 			scorer := &KVCacheScorer{}
 			scores := scorer.Score(ctx, tt.pods)
 

pkg/epp/scheduling/plugins/scorer/queue_test.go

@@ -73,7 +73,7 @@ func TestQueueScorer(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			ctx := types.NewSchedulingContext(context.Background(), &types.LLMRequest{}, tt.pods)
+			ctx := types.NewSchedulingContext(context.Background(), &types.LLMRequest{}, nil, tt.pods)
 			scores := scorer.Score(ctx, tt.pods)
 
 			for i, pod := range tt.pods {

pkg/epp/scheduling/scheduler.go

@@ -108,7 +108,7 @@ func (s *Scheduler) Schedule(ctx context.Context, req *types.LLMRequest) (*types
 	// Snapshot pod metrics from the datastore to:
 	// 1. Reduce concurrent access to the datastore.
 	// 2. Ensure consistent data during the scheduling operation of a request.
-	sCtx := types.NewSchedulingContext(ctx, req, types.ToSchedulerPodMetrics(s.datastore.PodGetAll()))
+	sCtx := types.NewSchedulingContext(ctx, req, nil, types.ToSchedulerPodMetrics(s.datastore.PodGetAll()))
 	loggerDebug.Info(fmt.Sprintf("Scheduling a request, Metrics: %+v", sCtx.PodsSnapshot))
 
 	s.runPreSchedulePlugins(sCtx)

pkg/epp/scheduling/scheduler_test.go

@@ -21,6 +21,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+	"github.com/google/uuid"
 	k8stypes "k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend"
 	backendmetrics "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend/metrics" // Import config for thresholds
@@ -40,6 +41,7 @@ func TestSchedule(t *testing.T) {
 		{
 			name: "no pods in datastore",
 			req: &types.LLMRequest{
+				RequestId:           uuid.NewString(),
 				Model:               "any-model",
 				ResolvedTargetModel: "any-model",
 				Critical:            true,
@@ -50,6 +52,7 @@ func TestSchedule(t *testing.T) {
 		{
 			name: "critical request",
 			req: &types.LLMRequest{
+				RequestId:           uuid.NewString(),
 				Model:               "critical",
 				ResolvedTargetModel: "critical",
 				Critical:            true,
@@ -114,6 +117,7 @@ func TestSchedule(t *testing.T) {
 		{
 			name: "sheddable request, accepted",
 			req: &types.LLMRequest{
+				RequestId:           uuid.NewString(),
 				Model:               "sheddable",
 				ResolvedTargetModel: "sheddable",
 				Critical:            false,
@@ -177,6 +181,7 @@ func TestSchedule(t *testing.T) {
 		{
 			name: "sheddable request, dropped",
 			req: &types.LLMRequest{
+				RequestId:           uuid.NewString(),
 				Model:               "sheddable",
 				ResolvedTargetModel: "sheddable",
 				Critical:            false,
@@ -356,7 +361,10 @@ func TestSchedulePlugins(t *testing.T) {
 			// Initialize the scheduler
 			scheduler := NewSchedulerWithConfig(&fakeDataStore{pods: test.input}, &test.config)
 
-			req := &types.LLMRequest{Model: "test-model"}
+			req := &types.LLMRequest{
+				RequestId: uuid.NewString(),
+				Model:     "test-model",
+			}
 			got, err := scheduler.Schedule(context.Background(), req)
 
 			// Validate error state

pkg/epp/scheduling/types/types.go

@@ -28,6 +28,8 @@ import (
 
 // LLMRequest is a structured representation of the fields we parse out of the LLMRequest body.
 type LLMRequest struct {
+	// RequestId is the Envoy generated Id for the request being processed
+	RequestId string
 	// Model is the name of the model that the user specified in the request body.
 	Model string
 	// ResolvedTargetModel is the final target model after traffic split.
@@ -45,6 +47,20 @@ func (r *LLMRequest) String() string {
 		r.Model, r.ResolvedTargetModel, r.Critical, len(r.Prompt), r.Headers)
 }
 
+// LLMResponse contains information from the response received to be passed to plugins
+type LLMResponse struct {
+	// RequestId is the Envoy generated Id for the request being processed
+	RequestId string
+	// Headers is a map of the response headers. Nil during body processing
+	Headers map[string]string
+	// Body Is the body of the response or nil during header processing
+	Body string
+	// IsStreaming indicates whether or not the response is being streamed by the model
+	IsStreaming bool
+	// EndOfStream when true indicates that this invocation contains the last chunk of the response
+	EndOfStream bool
+}
+
 type Pod interface {
 	GetPod() *backend.Pod
 	GetMetrics() *backendmetrics.Metrics
@@ -61,6 +77,7 @@ type SchedulingContext struct {
 	context.Context
 	Logger       logr.Logger
 	Req          *LLMRequest
+	Resp         *LLMResponse
 	PodsSnapshot []Pod
 }
 
@@ -84,12 +101,13 @@ type PodMetrics struct {
 	*backendmetrics.Metrics
 }
 
-func NewSchedulingContext(ctx context.Context, req *LLMRequest, pods []Pod) *SchedulingContext {
+func NewSchedulingContext(ctx context.Context, req *LLMRequest, resp *LLMResponse, pods []Pod) *SchedulingContext {
 	logger := log.FromContext(ctx).WithValues("request", req)
 	return &SchedulingContext{
 		Context:      ctx,
 		Logger:       logger,
 		Req:          req,
+		Resp:         resp,
 		PodsSnapshot: pods,
 	}
 }