feat: Expose watermark over HTTP (#120)

Signed-off-by: Derek Wang <whynowy@gmail.com>

pkg/apis/proto/daemon/daemon.proto

@@ -58,6 +58,25 @@ message GetVertexMetricsResponse {
   required VertexMetrics vertex = 1;
 }
 
+/* Watermark */
+// VertexWatermark has vertex to watermark mapping.
+message VertexWatermark {
+  required string pipeline = 1;
+  required string vertex = 2;
+  required int64 watermark = 3;
+  required bool isWatermarkEnabled = 4;
+}
+
+message GetVertexWatermarkResponse {
+  required VertexWatermark vertexWatermark = 1;
+}
+
+// GetVertexWatermarksRequest requests for the watermark for a pipeline's vertex.
+message GetVertexWatermarkRequest {
+  required string pipeline = 1;
+  required string vertex = 2;
+}
+
 // DaemonService is a grpc service that is used to provide APIs for giving any pipeline information.
 service DaemonService {
 
@@ -72,4 +91,9 @@ service DaemonService {
   rpc GetVertexMetrics (GetVertexMetricsRequest) returns (GetVertexMetricsResponse) {
     option (google.api.http).get = "/api/v1/pipelines/{pipeline}/vertices/{vertex}/metrics";
   };
+
+  // GetVertexWatermark return the watermark of the given vertex based on the incoming edge buffer
+  rpc GetVertexWatermark (GetVertexWatermarkRequest) returns (GetVertexWatermarkResponse) {
+    option (google.api.http).get = "/api/v1/pipelines/{pipeline}/vertices/{vertex}/watermark";
+  };
 }

pkg/daemon/client/daemon_client.go

@@ -72,3 +72,15 @@ func (dc *DaemonClient) GetVertexMetrics(ctx context.Context, pipeline, vertex s
 		return rspn.Vertex, nil
 	}
 }
+
+// GetVertexWatermark returns the VertexWatermark response instance for GetVertexWatermarkRequest
+func (dc *DaemonClient) GetVertexWatermark(ctx context.Context, pipeline, vertex string) (*daemon.VertexWatermark, error) {
+	if rspn, err := dc.client.GetVertexWatermark(ctx, &daemon.GetVertexWatermarkRequest{
+		Pipeline: &pipeline,
+		Vertex:   &vertex,
+	}); err != nil {
+		return nil, err
+	} else {
+		return rspn.VertexWatermark, nil
+	}
+}

pkg/daemon/server/daemon_server.go

@@ -104,7 +104,7 @@ func (ds *daemonServer) newGRPCServer(isbSvcClient isbsvc.ISBService) *grpc.Serv
 	}
 	grpcServer := grpc.NewServer(sOpts...)
 	grpc_prometheus.Register(grpcServer)
-	daemon.RegisterDaemonServiceServer(grpcServer, service.NewPipelineMetricsQueryService(isbSvcClient, ds.pipeline))
+	daemon.RegisterDaemonServiceServer(grpcServer, service.NewPipelineMetadataQuery(isbSvcClient, ds.pipeline))
 	return grpcServer
 }
 

pkg/daemon/server/service/pipeline_metrics_query_service.go → pkg/daemon/server/service/pipeline_metrics_query.go

@@ -1,3 +1,4 @@
+// Package service is built for querying metadata and to expose it over daemon service.
 package service
 
 import (
@@ -24,15 +25,17 @@ type metricsHttpClient interface {
 	Get(url string) (*http.Response, error)
 }
 
-type pipelineMetricsQueryService struct {
-	isbSvcClient isbsvc.ISBService
-	pipeline     *v1alpha1.Pipeline
-	httpClient   metricsHttpClient
+// pipelineMetadataQuery has the metadata required for the pipeline queries
+type pipelineMetadataQuery struct {
+	isbSvcClient    isbsvc.ISBService
+	pipeline        *v1alpha1.Pipeline
+	httpClient      metricsHttpClient
+	vertexWatermark *watermarkFetchers
 }
 
-// NewPipelineMetricsQueryService returns a new instance of pipelineMetricsQueryService
-func NewPipelineMetricsQueryService(isbSvcClient isbsvc.ISBService, pipeline *v1alpha1.Pipeline) *pipelineMetricsQueryService {
-	return &pipelineMetricsQueryService{
+// NewPipelineMetadataQuery returns a new instance of pipelineMetadataQuery
+func NewPipelineMetadataQuery(isbSvcClient isbsvc.ISBService, pipeline *v1alpha1.Pipeline) *pipelineMetadataQuery {
+	ps := pipelineMetadataQuery{
 		isbSvcClient: isbSvcClient,
 		pipeline:     pipeline,
 		httpClient: &http.Client{
@@ -42,10 +45,12 @@ func NewPipelineMetricsQueryService(isbSvcClient isbsvc.ISBService, pipeline *v1
 			Timeout: time.Second * 3,
 		},
 	}
+	ps.vertexWatermark = newVertexWatermarkFetcher(pipeline)
+	return &ps
 }
 
 // ListBuffers is used to obtain the all the edge buffers information of a pipeline
-func (ps *pipelineMetricsQueryService) ListBuffers(ctx context.Context, req *daemon.ListBuffersRequest) (*daemon.ListBuffersResponse, error) {
+func (ps *pipelineMetadataQuery) ListBuffers(ctx context.Context, req *daemon.ListBuffersRequest) (*daemon.ListBuffersResponse, error) {
 	log := logging.FromContext(ctx)
 	resp := new(daemon.ListBuffersResponse)
 
@@ -82,7 +87,7 @@ func (ps *pipelineMetricsQueryService) ListBuffers(ctx context.Context, req *dae
 }
 
 // GetBuffer is used to obtain one buffer information of a pipeline
-func (ps *pipelineMetricsQueryService) GetBuffer(ctx context.Context, req *daemon.GetBufferRequest) (*daemon.GetBufferResponse, error) {
+func (ps *pipelineMetadataQuery) GetBuffer(ctx context.Context, req *daemon.GetBufferRequest) (*daemon.GetBufferResponse, error) {
 	bufferInfo, err := ps.isbSvcClient.GetBufferInfo(ctx, v1alpha1.Buffer{Name: *req.Buffer, Type: v1alpha1.EdgeBuffer})
 	if err != nil {
 		return nil, fmt.Errorf("failed to get information of buffer %q:%v", *req.Buffer, err)
@@ -117,7 +122,7 @@ func (ps *pipelineMetricsQueryService) GetBuffer(ctx context.Context, req *daemo
 // GetVertexMetrics is used to query the metrics service and is used to obtain the processing rate of a given vertex for 1m, 5m and 15m.
 // In the future maybe latency will also be added here?
 // Should this method live here or maybe another file?
-func (ps *pipelineMetricsQueryService) GetVertexMetrics(ctx context.Context, req *daemon.GetVertexMetricsRequest) (*daemon.GetVertexMetricsResponse, error) {
+func (ps *pipelineMetadataQuery) GetVertexMetrics(ctx context.Context, req *daemon.GetVertexMetricsRequest) (*daemon.GetVertexMetricsResponse, error) {
 	log := logging.FromContext(ctx)
 	resp := new(daemon.GetVertexMetricsResponse)
 

pkg/daemon/server/service/pipeline_metrics_query_service_test.go → pkg/daemon/server/service/pipeline_metrics_query_test.go

@@ -56,7 +56,7 @@ func TestGetVertexMetrics(t *testing.T) {
 		ObjectMeta: metav1.ObjectMeta{Name: pipelineName},
 	}
 	client, _ := isbsvc.NewISBJetStreamSvc(pipelineName)
-	pipelineMetricsQueryService := NewPipelineMetricsQueryService(client, pipeline)
+	pipelineMetricsQueryService := NewPipelineMetadataQuery(client, pipeline)
 
 	metricsResponse := `# HELP vertex_processing_rate Message processing rate in the last period of seconds, tps. It represents the rate of a vertex instead of a pod.
 # TYPE vertex_processing_rate gauge
@@ -125,7 +125,7 @@ func TestGetBuffer(t *testing.T) {
 	}
 
 	ms := &mockIsbSvcClient{}
-	pipelineMetricsQueryService := NewPipelineMetricsQueryService(ms, pipeline)
+	pipelineMetricsQueryService := NewPipelineMetadataQuery(ms, pipeline)
 
 	bufferName := "numaflow-system-simple-pipeline-in-cat"
 
@@ -160,7 +160,7 @@ func TestListBuffers(t *testing.T) {
 	}
 
 	ms := &mockIsbSvcClient{}
-	pipelineMetricsQueryService := NewPipelineMetricsQueryService(ms, pipeline)
+	pipelineMetricsQueryService := NewPipelineMetadataQuery(ms, pipeline)
 
 	req := &daemon.ListBuffersRequest{Pipeline: &pipelineName}