From 7977d6b66964e9d1497875afc92dd65357df933b Mon Sep 17 00:00:00 2001
From: bergquist <carl.bergquist@gmail.com>
Date: Fri, 15 Dec 2017 17:17:58 +0100
Subject: [PATCH] merge backend-datasource and datasource type

---
 pkg/plugins/datasource_plugin.go | 49 ++++++++++++++++++++++++++++++++
 pkg/plugins/models.go            |  2 ++
 pkg/plugins/plugins.go           | 23 +++++++--------
 3 files changed, 61 insertions(+), 13 deletions(-)

diff --git a/pkg/plugins/datasource_plugin.go b/pkg/plugins/datasource_plugin.go
index b36d7081dfe..6863b9a1be5 100644
--- a/pkg/plugins/datasource_plugin.go
+++ b/pkg/plugins/datasource_plugin.go
@@ -3,7 +3,16 @@ package plugins
 import (
 	"encoding/json"
 	"os"
+	"os/exec"
+	"path"
 	"path/filepath"
+
+	"github.com/grafana/grafana/pkg/log"
+	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/plugins/backend"
+	"github.com/grafana/grafana/pkg/tsdb"
+	shared "github.com/grafana/grafana/pkg/tsdb/models/proxy"
+	plugin "github.com/hashicorp/go-plugin"
 )
 
 type DataSourcePlugin struct {
@@ -16,6 +25,12 @@ type DataSourcePlugin struct {
 	Mixed        bool              `json:"mixed,omitempty"`
 	HasQueryHelp bool              `json:"hasQueryHelp,omitempty"`
 	Routes       []*AppPluginRoute `json:"routes"`
+
+	Backend    bool   `json:"backend,omitempty"`
+	Executable string `json:"executable,omitempty"`
+
+	log    log.Logger
+	client *plugin.Client
 }
 
 func (p *DataSourcePlugin) Load(decoder *json.Decoder, pluginDir string) error {
@@ -39,3 +54,37 @@ func (p *DataSourcePlugin) Load(decoder *json.Decoder, pluginDir string) error {
 	DataSources[p.Id] = p
 	return nil
 }
+
+func (p *DataSourcePlugin) initBackendPlugin(log log.Logger) error {
+	p.log = log.New("plugin-id", p.Id)
+
+	p.client = plugin.NewClient(&plugin.ClientConfig{
+		HandshakeConfig:  handshakeConfig,
+		Plugins:          map[string]plugin.Plugin{p.Id: &shared.TsdbPluginImpl{}},
+		Cmd:              exec.Command(path.Join(p.PluginDir, p.Executable)),
+		AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
+		Logger:           backend.LogWrapper{Logger: p.log},
+	})
+
+	rpcClient, err := p.client.Client()
+	if err != nil {
+		return err
+	}
+
+	raw, err := rpcClient.Dispense(p.Id)
+	if err != nil {
+		return err
+	}
+
+	plugin := raw.(shared.TsdbPlugin)
+
+	tsdb.RegisterTsdbQueryEndpoint(p.Id, func(dsInfo *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
+		return &shared.TsdbWrapper{TsdbPlugin: plugin}, nil
+	})
+
+	return nil
+}
+
+func (p *DataSourcePlugin) Kill() {
+	p.client.Kill()
+}
diff --git a/pkg/plugins/models.go b/pkg/plugins/models.go
index 541b37c8a8a..b306fa69cdd 100644
--- a/pkg/plugins/models.go
+++ b/pkg/plugins/models.go
@@ -41,6 +41,8 @@ type PluginBase struct {
 	HideFromList bool               `json:"hideFromList,omitempty"`
 	State        string             `json:"state,omitempty"`
 
+
+
 	IncludedInAppId string `json:"-"`
 	PluginDir       string `json:"-"`
 	DefaultNavUrl   string `json:"-"`
diff --git a/pkg/plugins/plugins.go b/pkg/plugins/plugins.go
index 43b55d78b9f..3da5ea52465 100644
--- a/pkg/plugins/plugins.go
+++ b/pkg/plugins/plugins.go
@@ -70,10 +70,10 @@ func Init() error {
 	Plugins = make(map[string]*PluginBase)
 	BackendDatasources = make(map[string]*BackendDatasource)
 	PluginTypes = map[string]interface{}{
-		"panel":              PanelPlugin{},
-		"datasource":         DataSourcePlugin{},
-		"app":                AppPlugin{},
-		"backend-datasource": BackendDatasource{},
+		"panel":      PanelPlugin{},
+		"datasource": DataSourcePlugin{},
+		"app":        AppPlugin{},
+		//"backend-datasource": BackendDatasource{},
 	}
 
 	plog.Info("Starting plugin search")
@@ -98,20 +98,17 @@ func Init() error {
 	for _, panel := range Panels {
 		panel.initFrontendPlugin()
 	}
-	for _, panel := range DataSources {
-		panel.initFrontendPlugin()
+	for _, ds := range DataSources {
+		if ds.Backend {
+			ds.initBackendPlugin(plog)
+		}
+
+		ds.initFrontendPlugin()
 	}
 	for _, app := range Apps {
 		app.initApp()
 	}
 
-	for _, be := range BackendDatasources {
-		err := be.initBackendPlugin(plog)
-		if err != nil {
-			plog.Error("failed to init plugin", "id", be.Id, "error", err)
-		}
-	}
-
 	go StartPluginUpdateChecker()
 	go updateAppDashboards()