K8s/Testdata: Expose testdata in standalone apiserver (#80248)

.vscode/launch.json

@@ -12,14 +12,14 @@
       "args": ["server", "--homepath", "${workspaceFolder}", "--packaging", "dev"]
     },
     {
-      "name": "Run API Server (k8s)",
+      "name": "Run API Server (testdata)",
       "type": "go",
       "request": "launch",
       "mode": "auto",
       "program": "${workspaceFolder}/pkg/cmd/grafana/",
       "env": {},
       "cwd": "${workspaceFolder}",
-      "args": ["apiserver", "example.grafana.app"]
+      "args": ["apiserver", "testdata.datasource.grafana.app"]
     },
     {
       "name": "Attach to Chrome",

pkg/cmd/grafana/apiserver/cmd.go

@@ -4,18 +4,17 @@ import (
 	"os"
 	"path"
 
+	"github.com/spf13/cobra"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+	"k8s.io/apiserver/pkg/server/options"
 	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/component-base/cli"
 	"k8s.io/klog/v2"
+	aggregatorscheme "k8s.io/kube-aggregator/pkg/apiserver/scheme"
 
 	"github.com/grafana/grafana/pkg/aggregator"
 	grafanaapiserver "github.com/grafana/grafana/pkg/services/grafana-apiserver"
 	"github.com/grafana/grafana/pkg/services/grafana-apiserver/utils"
-
-	"github.com/spf13/cobra"
-	genericapiserver "k8s.io/apiserver/pkg/server"
-	"k8s.io/apiserver/pkg/server/options"
-	"k8s.io/component-base/cli"
-	aggregatorscheme "k8s.io/kube-aggregator/pkg/apiserver/scheme"
 )
 
 const (
@@ -34,7 +33,7 @@ func newCommandStartExampleAPIServer(o *APIServerOptions, stopCh <-chan struct{}
 		Example: "grafana apiserver example.grafana.app",
 		RunE: func(c *cobra.Command, args []string) error {
 			// Load each group from the args
-			if err := o.LoadAPIGroupBuilders(args[1:]); err != nil {
+			if err := o.loadAPIGroupBuilders(args[1:]); err != nil {
 				return err
 			}
 

pkg/cmd/grafana/apiserver/server.go

@@ -12,6 +12,7 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 	netutils "k8s.io/utils/net"
 
+	"github.com/grafana/grafana/pkg/registry/apis/datasource"
 	"github.com/grafana/grafana/pkg/registry/apis/example"
 	grafanaAPIServer "github.com/grafana/grafana/pkg/services/grafana-apiserver"
 	"github.com/grafana/grafana/pkg/services/grafana-apiserver/utils"
@@ -39,13 +40,19 @@ func newAPIServerOptions(out, errOut io.Writer) *APIServerOptions {
 	}
 }
 
-func (o *APIServerOptions) LoadAPIGroupBuilders(args []string) error {
+func (o *APIServerOptions) loadAPIGroupBuilders(args []string) error {
 	o.builders = []grafanaAPIServer.APIGroupBuilder{}
 	for _, g := range args {
 		switch g {
 		// No dependencies for testing
 		case "example.grafana.app":
 			o.builders = append(o.builders, example.NewTestingAPIBuilder())
+		case "testdata.datasource.grafana.app":
+			ds, err := datasource.NewStandaloneDatasource(g)
+			if err != nil {
+				return err
+			}
+			o.builders = append(o.builders, ds)
 		default:
 			return fmt.Errorf("unknown group: %s", g)
 		}

pkg/registry/apis/datasource/README.md

@@ -2,7 +2,7 @@ Experimental!
 
 This is exploring how to expose any datasource as a k8s aggregated API server.
 
-Unlike the other services, this will register other plugins as:
+Unlike the other services, this will register datasources as:
 
 > {plugin}.datasource.grafana.app
 

pkg/registry/apis/datasource/connections.go

@@ -7,6 +7,7 @@ import (
 	"k8s.io/apimachinery/pkg/apis/meta/internalversion"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apiserver/pkg/endpoints/request"
 	"k8s.io/apiserver/pkg/registry/rest"
 
 	"github.com/grafana/grafana/pkg/apis"
@@ -57,32 +58,38 @@ func (s *connectionAccess) ConvertToTable(ctx context.Context, object runtime.Ob
 }
 
 func (s *connectionAccess) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
+	ns := request.NamespaceValue(ctx)
 	ds, err := s.builder.getDataSource(ctx, name)
 	if err != nil {
 		return nil, err
 	}
-	return s.asConnection(ds), nil
+	return s.asConnection(ds, ns), nil
 }
 
 func (s *connectionAccess) List(ctx context.Context, options *internalversion.ListOptions) (runtime.Object, error) {
+	ns := request.NamespaceValue(ctx)
+	if ns == "" {
+		// require a namespace so we do not need to support reverse mappings (yet)
+		return nil, fmt.Errorf("missing namespace in request URL")
+	}
 	result := &v0alpha1.DataSourceConnectionList{
 		Items: []v0alpha1.DataSourceConnection{},
 	}
 	vals, err := s.builder.getDataSources(ctx)
 	if err == nil {
 		for _, ds := range vals {
-			result.Items = append(result.Items, *s.asConnection(ds))
+			result.Items = append(result.Items, *s.asConnection(ds, ns))
 		}
 	}
 	return result, err
 }
 
-func (s *connectionAccess) asConnection(ds *datasources.DataSource) *v0alpha1.DataSourceConnection {
+func (s *connectionAccess) asConnection(ds *datasources.DataSource, ns string) *v0alpha1.DataSourceConnection {
 	v := &v0alpha1.DataSourceConnection{
 		TypeMeta: s.resourceInfo.TypeMeta(),
 		ObjectMeta: metav1.ObjectMeta{
 			Name:              ds.UID,
-			Namespace:         s.builder.namespacer(ds.OrgID),
+			Namespace:         ns,
 			CreationTimestamp: metav1.NewTime(ds.Created),
 			ResourceVersion:   fmt.Sprintf("%d", ds.Updated.UnixMilli()),
 		},

pkg/registry/apis/datasource/register.go

@@ -37,12 +37,11 @@ var _ grafanaapiserver.APIGroupBuilder = (*DataSourceAPIBuilder)(nil)
 type DataSourceAPIBuilder struct {
 	connectionResourceInfo apis.ResourceInfo
 
-	plugin        pluginstore.Plugin
+	plugin        plugins.JSONData
 	client        plugins.Client
 	dsService     datasources.DataSourceService
 	dsCache       datasources.CacheService
 	accessControl accesscontrol.AccessControl
-	namespacer    request.NamespaceMapper
 }
 
 func RegisterAPIService(
@@ -67,13 +66,12 @@ func RegisterAPIService(
 		"grafana-testdata-datasource",
 	}
 
-	namespacer := request.GetNamespaceMapper(cfg)
 	for _, ds := range all {
 		if !slices.Contains(ids, ds.ID) {
 			continue // skip this one
 		}
 
-		builder, err = NewDataSourceAPIBuilder(ds, pluginClient, dsService, dsCache, accessControl, namespacer)
+		builder, err = NewDataSourceAPIBuilder(ds.JSONData, pluginClient, dsService, dsCache, accessControl)
 		if err != nil {
 			return nil, err
 		}
@@ -83,12 +81,11 @@ func RegisterAPIService(
 }
 
 func NewDataSourceAPIBuilder(
-	plugin pluginstore.Plugin,
+	plugin plugins.JSONData,
 	client plugins.Client,
 	dsService datasources.DataSourceService,
 	dsCache datasources.CacheService,
-	accessControl accesscontrol.AccessControl,
-	namespacer request.NamespaceMapper) (*DataSourceAPIBuilder, error) {
+	accessControl accesscontrol.AccessControl) (*DataSourceAPIBuilder, error) {
 	group, err := getDatasourceGroupNameFromPluginID(plugin.ID)
 	if err != nil {
 		return nil, err
@@ -100,7 +97,6 @@ func NewDataSourceAPIBuilder(
 		dsService:              dsService,
 		dsCache:                dsCache,
 		accessControl:          accessControl,
-		namespacer:             namespacer,
 	}, nil
 }
 

pkg/registry/apis/datasource/standalone.go

@@ -0,0 +1,51 @@
+package datasource
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/grafana/grafana/pkg/plugins"
+	"github.com/grafana/grafana/pkg/services/accesscontrol/actest"
+	"github.com/grafana/grafana/pkg/services/datasources"
+	fakeDatasources "github.com/grafana/grafana/pkg/services/datasources/fakes"
+	testdatasource "github.com/grafana/grafana/pkg/tsdb/grafana-testdata-datasource"
+)
+
+// This is a helper function to create a new datasource API server for a group
+// This currently has no dependencies and only works for testdata.  In future iterations
+// this will include here (or elsewhere) versions that can load config from HG api or
+// the remote SQL directly
+func NewStandaloneDatasource(group string) (*DataSourceAPIBuilder, error) {
+	if group != "testdata.datasource.grafana.app" {
+		return nil, fmt.Errorf("only testadata is currently supported")
+	}
+
+	orgId := int64(1)
+	pluginId := "grafana-testdata-datasource"
+	now := time.Now()
+	dss := []*datasources.DataSource{
+		{
+			OrgID:   orgId, // default -- used in the list command
+			Type:    pluginId,
+			UID:     "builtin", // fake for now
+			Created: now,
+			Updated: now,
+			Name:    "Testdata (builtin)",
+		},
+		{
+			OrgID:   orgId, // default -- used in the list command
+			Type:    pluginId,
+			UID:     "PD8C576611E62080A", // match the gdev version
+			Created: now,
+			Updated: now,
+			Name:    "gdev-testdata",
+		},
+	}
+	return NewDataSourceAPIBuilder(
+		plugins.JSONData{ID: pluginId}, testdatasource.ProvideService(),
+		&fakeDatasources.FakeDataSourceService{DataSources: dss},
+		&fakeDatasources.FakeCacheService{DataSources: dss},
+		// Always allow... but currently not called in standalone!
+		&actest.FakeAccessControl{ExpectedEvaluate: true},
+	)
+}

pkg/registry/apis/example/register.go

@@ -45,7 +45,7 @@ func RegisterAPIService(features featuremgmt.FeatureToggles, apiregistration gra
 		return nil // skip registration unless opting into experimental apis
 	}
 	builder := NewTestingAPIBuilder()
-	apiregistration.RegisterAPI(NewTestingAPIBuilder())
+	apiregistration.RegisterAPI(builder)
 	return builder
 }
 

pkg/tsdb/grafana-testdata-datasource/testdata.go

@@ -9,9 +9,13 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/resource/httpadapter"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
+
 	"github.com/grafana/grafana/pkg/tsdb/grafana-testdata-datasource/sims"
 )
 
+// ensures that testdata implements all client functions
+// var _ plugins.Client = &Service{}
+
 func ProvideService() *Service {
 	s := &Service{
 		queryMux:  datasource.NewQueryTypeMux(),
@@ -66,3 +70,8 @@ func (s *Service) CheckHealth(_ context.Context, _ *backend.CheckHealthRequest)
 		Message: "Data source is working",
 	}, nil
 }
+
+// CollectMetricsHandler handles metric collection.
+func (s *Service) CollectMetrics(ctx context.Context, req *backend.CollectMetricsRequest) (*backend.CollectMetricsResult, error) {
+	return nil, nil
+}