Tempo: Decouple Tempo from Grafana core (#79888)

pkg/tsdb/tempo/standalone/datasource.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
+	tempo "github.com/grafana/grafana/pkg/tsdb/tempo"
+)
+
+type Datasource struct {
+	Service *tempo.Service
+}
+
+var (
+	_ backend.QueryDataHandler = (*Datasource)(nil)
+	_ backend.StreamHandler    = (*Datasource)(nil)
+)
+
+func NewDatasource(c context.Context, b backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
+	return &Datasource{
+		Service: tempo.ProvideService(httpclient.NewProvider()),
+	}, nil
+}
+
+func (d *Datasource) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
+	return d.Service.QueryData(ctx, req)
+}
+
+func (d *Datasource) SubscribeStream(ctx context.Context, req *backend.SubscribeStreamRequest) (*backend.SubscribeStreamResponse, error) {
+	return d.Service.SubscribeStream(ctx, req)
+}
+
+func (d *Datasource) PublishStream(ctx context.Context, req *backend.PublishStreamRequest) (*backend.PublishStreamResponse, error) {
+	return d.Service.PublishStream(ctx, req)
+}
+
+func (d *Datasource) RunStream(ctx context.Context, req *backend.RunStreamRequest, sender *backend.StreamSender) error {
+	return d.Service.RunStream(ctx, req, sender)
+}

pkg/tsdb/tempo/standalone/main.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"os"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend/datasource"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
+)
+
+func main() {
+	// Created as described at https://grafana.com/developers/plugin-tools/introduction/backend-plugins
+	if err := datasource.Manage("tempo", NewDatasource, datasource.ManageOpts{}); err != nil {
+		log.DefaultLogger.Error(err.Error())
+		os.Exit(1)
+	}
+}