feat(plugins): better logging and handling of loading plugins, try to create plugins dir if it does not exist, fixes #3974

pkg/cmd/web.go

@@ -31,7 +31,7 @@ func newMacaron() *macaron.Macaron {
 
 	for _, route := range plugins.StaticRoutes {
 		pluginRoute := path.Join("/public/plugins/", route.PluginId)
-		log.Info("Plugin: Adding static route %s -> %s", pluginRoute, route.Directory)
+		log.Info("Plugins: Adding route %s -> %s", pluginRoute, route.Directory)
 		mapStatic(m, route.Directory, "", pluginRoute)
 	}
 

pkg/plugins/app_plugin.go

@@ -57,7 +57,9 @@ func (app *AppPlugin) Load(decoder *json.Decoder, pluginDir string) error {
 		return err
 	}
 
-	app.PluginDir = pluginDir
+	if err := app.registerPlugin(pluginDir); err != nil {
+		return err
+	}
 
 	Apps[app.Id] = app
 	return nil

pkg/plugins/datasource_plugin.go

@@ -17,8 +17,10 @@ func (p *DataSourcePlugin) Load(decoder *json.Decoder, pluginDir string) error {
 		return err
 	}
 
-	p.PluginDir = pluginDir
+	if err := p.registerPlugin(pluginDir); err != nil {
-	DataSources[p.Id] = p
+		return err
+	}
 
+	DataSources[p.Id] = p
 	return nil
 }

pkg/plugins/frontend_plugin.go

@@ -6,7 +6,6 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/grafana/grafana/pkg/log"
 	"github.com/grafana/grafana/pkg/util"
 )
 
@@ -38,13 +37,10 @@ func (fp *FrontendPluginBase) initFrontendPlugin() {
 }
 
 func (fp *FrontendPluginBase) setPathsBasedOnApp(app *AppPlugin) {
-	//	log.Info("Module Before: %v", fp.Module)
-	// find out plugins path relative to app static root
 	appSubPath := strings.Replace(fp.PluginDir, app.StaticRootAbs, "", 1)
 	fp.IncludedInAppId = app.Id
 	fp.BaseUrl = app.BaseUrl
 	fp.Module = util.JoinUrlFragments("plugins/"+app.Id, appSubPath) + "/module"
-	log.Info("setting paths based on app: subpath = %v, module: %v", appSubPath, fp.Module)
 }
 
 func (fp *FrontendPluginBase) handleModuleDefaults() {

pkg/plugins/models.go

@@ -2,6 +2,11 @@ package plugins
 
 import (
 	"encoding/json"
+	"errors"
+	"strings"
+
+	"github.com/grafana/grafana/pkg/log"
+	"github.com/grafana/grafana/pkg/setting"
 )
 
 type PluginLoader interface {
@@ -18,6 +23,20 @@ type PluginBase struct {
 	PluginDir       string `json:"-"`
 }
 
+func (pb *PluginBase) registerPlugin(pluginDir string) error {
+	if _, exists := Plugins[pb.Id]; exists {
+		return errors.New("Plugin with same id already exists")
+	}
+
+	if !strings.HasPrefix(pluginDir, setting.StaticRootPath) {
+		log.Info("Plugins: Registering plugin %v", pb.Name)
+	}
+
+	pb.PluginDir = pluginDir
+	Plugins[pb.Id] = pb
+	return nil
+}
+
 type PluginInfo struct {
 	Author      PluginInfoLink      `json:"author"`
 	Description string              `json:"description"`

pkg/plugins/panel_plugin.go

@@ -11,8 +11,10 @@ func (p *PanelPlugin) Load(decoder *json.Decoder, pluginDir string) error {
 		return err
 	}
 
-	p.PluginDir = pluginDir
+	if err := p.registerPlugin(pluginDir); err != nil {
-	Panels[p.Id] = p
+		return err
+	}
 
+	Panels[p.Id] = p
 	return nil
 }

pkg/plugins/plugins.go

@@ -19,6 +19,7 @@ var (
 	Panels       map[string]*PanelPlugin
 	StaticRoutes []*PluginStaticRoute
 	Apps         map[string]*AppPlugin
+	Plugins      map[string]*PluginBase
 	PluginTypes  map[string]interface{}
 )
 
@@ -32,14 +33,30 @@ func Init() error {
 	StaticRoutes = make([]*PluginStaticRoute, 0)
 	Panels = make(map[string]*PanelPlugin)
 	Apps = make(map[string]*AppPlugin)
+	Plugins = make(map[string]*PluginBase)
 	PluginTypes = map[string]interface{}{
 		"panel":      PanelPlugin{},
 		"datasource": DataSourcePlugin{},
 		"app":        AppPlugin{},
 	}
 
+	log.Info("Plugins: Scan starting")
 	scan(path.Join(setting.StaticRootPath, "app/plugins"))
-	scan(setting.PluginsPath)
+
+	// check if plugins dir exists
+	if _, err := os.Stat(setting.PluginsPath); os.IsNotExist(err) {
+		log.Warn("Plugins: Plugin dir %v does not exist", setting.PluginsPath)
+		if err = os.MkdirAll(setting.PluginsPath, os.ModePerm); err != nil {
+			log.Warn("Plugins: Failed to create plugin dir: %v, error: %v", setting.PluginsPath, err)
+		} else {
+			log.Info("Plugins: Plugin dir %v created", setting.PluginsPath)
+			scan(setting.PluginsPath)
+		}
+	} else {
+		scan(setting.PluginsPath)
+	}
+
+	// check plugin paths defined in config
 	checkPluginPaths()
 
 	for _, panel := range Panels {
@@ -55,32 +72,11 @@ func Init() error {
 	return nil
 }
 
-// func checkDependencies() {
-// 	for appType, app := range Apps {
-// 		for _, reqPanel := range app.PanelPlugins {
-// 			if _, ok := Panels[reqPanel]; !ok {
-// 				log.Fatal(4, "App %s requires Panel type %s, but it is not present.", appType, reqPanel)
-// 			}
-// 		}
-// 		for _, reqDataSource := range app.DatasourcePlugins {
-// 			if _, ok := DataSources[reqDataSource]; !ok {
-// 				log.Fatal(4, "App %s requires DataSource type %s, but it is not present.", appType, reqDataSource)
-// 			}
-// 		}
-// 		for _, reqApiPlugin := range app.ApiPlugins {
-// 			if _, ok := ApiPlugins[reqApiPlugin]; !ok {
-// 				log.Fatal(4, "App %s requires ApiPlugin type %s, but it is not present.", appType, reqApiPlugin)
-// 			}
-// 		}
-// 	}
-// }
-
 func checkPluginPaths() error {
 	for _, section := range setting.Cfg.Sections() {
 		if strings.HasPrefix(section.Name(), "plugin.") {
 			path := section.Key("path").String()
 			if path != "" {
-				log.Info("Plugin: Scaning dir %s", path)
 				scan(path)
 			}
 		}
@@ -93,6 +89,8 @@ func scan(pluginDir string) error {
 		pluginPath: pluginDir,
 	}
 
+	log.Info("Plugins: Scaning dir %s", pluginDir)
+
 	if err := util.Walk(pluginDir, true, true, scanner.walker); err != nil {
 		if pluginDir != "data/plugins" {
 			log.Warn("Could not scan dir \"%v\" error: %s", pluginDir, err)
@@ -123,7 +121,7 @@ func (scanner *PluginScanner) walker(currentPath string, f os.FileInfo, err erro
 	if f.Name() == "plugin.json" {
 		err := scanner.loadPluginJson(currentPath)
 		if err != nil {
-			log.Error(3, "Failed to load plugin json file: %v,  err: %v", currentPath, err)
+			log.Error(3, "Plugins: Failed to load plugin json file: %v,  err: %v", currentPath, err)
 			scanner.errors = append(scanner.errors, err)
 		}
 	}

public/app/plugins/datasource/influxdb/plugin.json

@@ -1,6 +1,6 @@
 {
   "type": "datasource",
-  "name": "InfluxDB 0.9.x",
+  "name": "InfluxDB",
   "id": "influxdb",
 
   "defaultMatchFormat": "regex values",