Introduce TSDB service (#31520)

* Introduce TSDB service

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>
Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

pkg/plugins/backendplugin/ifaces.go

@@ -0,0 +1,40 @@
+package backendplugin
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/models"
+)
+
+// Manager manages backend plugins.
+type Manager interface {
+	// Register registers a backend plugin
+	Register(pluginID string, factory PluginFactoryFunc) error
+	// StartPlugin starts a non-managed backend plugin
+	StartPlugin(ctx context.Context, pluginID string) error
+	// CollectMetrics collects metrics from a registered backend plugin.
+	CollectMetrics(ctx context.Context, pluginID string) (*backend.CollectMetricsResult, error)
+	// CheckHealth checks the health of a registered backend plugin.
+	CheckHealth(ctx context.Context, pCtx backend.PluginContext) (*backend.CheckHealthResult, error)
+	// CallResource calls a plugin resource.
+	CallResource(pluginConfig backend.PluginContext, ctx *models.ReqContext, path string)
+	// GetDataPlugin gets a DataPlugin with a certain ID or nil if it doesn't exist.
+	// TODO: interface{} is the return type in order to break a dependency cycle. Should be plugins.DataPlugin.
+	GetDataPlugin(pluginID string) interface{}
+}
+
+// Plugin is the backend plugin interface.
+type Plugin interface {
+	PluginID() string
+	Logger() log.Logger
+	Start(ctx context.Context) error
+	Stop(ctx context.Context) error
+	IsManaged() bool
+	Exited() bool
+	CanHandleDataQueries() bool
+	backend.CollectMetricsHandler
+	backend.CheckHealthHandler
+	backend.CallResourceHandler
+}