Chore: Makefile / Magefile task to build plugins (#76763)

.github/CODEOWNERS

@@ -293,6 +293,7 @@
 /pkg/services/pluginsintegration/ @grafana/plugins-platform-backend
 /pkg/plugins/pfs/ @grafana/plugins-platform-backend @grafana/grafana-as-code
 /pkg/tsdb/grafana-testdata-datasource/ @grafana/plugins-platform-backend
+/pkg/tsdb/Magefile.go @grafana/plugins-platform-backend
 /pkg/services/pluginsintegration/pluginsettings/ @grafana/plugins-platform-backend
 
 # Backend code docs

Makefile

@@ -141,6 +141,22 @@ build-js: ## Build frontend assets.
 	yarn run build
 	yarn run plugins:build-bundled
 
+build-plugins-go: ## Build decoupled plugins
+	@echo "build plugins"
+	@cd pkg/tsdb; \
+	mage -v
+
+PLUGIN_ID ?=
+
+build-plugin-go: ## Build decoupled plugins
+	@echo "build plugin $(PLUGIN_ID)"
+	@cd pkg/tsdb; \
+	if [ -z "$(PLUGIN_ID)" ]; then \
+		echo "PLUGIN_ID is not set"; \
+		exit 1; \
+	fi; \
+	mage -v buildplugin $(PLUGIN_ID)
+
 build: build-go build-js ## Build backend and frontend.
 
 run: $(BRA) ## Build and run web server on filesystem changes.

pkg/tsdb/Magefile.go

@@ -0,0 +1,119 @@
+//go:build mage
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	build "github.com/grafana/grafana-plugin-sdk-go/build"
+)
+
+func find(dir string, name string) ([]string, error) {
+	files := []string{}
+	err := filepath.Walk(dir, func(path string, f os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if filepath.Base(path) == name {
+			files = append(files, path)
+		}
+		return nil
+	})
+
+	return files, err
+}
+
+func findPluginJSONDir(pluginDir string) (string, error) {
+	pluginJSONMatches, err := find(filepath.Join("../../public/app/plugins/datasource", pluginDir), "plugin.json")
+	if err != nil {
+		return "", err
+	}
+	if len(pluginJSONMatches) == 0 {
+		return "", fmt.Errorf("Could not find plugin.json")
+	}
+	pluginJSONPath := ""
+	for _, pluginJSONMatch := range pluginJSONMatches {
+		// Ignore dist folder
+		if filepath.Base(filepath.Dir(pluginJSONMatch)) != "dist" {
+			pluginJSONPath = pluginJSONMatch
+		}
+	}
+	pluginJSONPath, err = filepath.Abs(pluginJSONPath)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Dir(pluginJSONPath), nil
+}
+
+func findRootDir(pluginDir string) (string, error) {
+	matches, err := find(pluginDir, "main.go")
+	if err != nil {
+		return "", err
+	}
+	if len(matches) == 0 {
+		return "", fmt.Errorf("Could not find main.go")
+	}
+	absolutePath, err := filepath.Abs(matches[0])
+	if err != nil {
+		return "", err
+	}
+	return filepath.Dir(absolutePath), nil
+}
+
+func buildPlugin(rootDir, pluginJSONDir string) {
+	distDir := filepath.Join(pluginJSONDir, "dist")
+
+	configCallback := func(cfg build.Config) (build.Config, error) {
+		cfg.OutputBinaryPath = distDir
+		cfg.PluginJSONPath = pluginJSONDir
+		cfg.RootPackagePath = rootDir
+		return cfg, nil
+	}
+	build.SetBeforeBuildCallback(configCallback)
+	build.BuildAll()
+}
+
+func BuildPlugin(pluginDir string) error {
+	rootDir, err := findRootDir(pluginDir)
+	if err != nil {
+		return err
+	}
+	pluginJSONDir, err := findPluginJSONDir(pluginDir)
+	if err != nil {
+		return err
+	}
+	buildPlugin(rootDir, pluginJSONDir)
+	return nil
+}
+
+func BuildAllPlugins() error {
+	// Plugins need to have a main.go file
+	matches, err := find(".", "main.go")
+	if err != nil {
+		return err
+	}
+	for _, match := range matches {
+		// Get the directory name of the plugin
+		parts := strings.Split(filepath.ToSlash(match), "/")
+		if len(parts) == 0 {
+			continue
+		}
+		pluginDir := parts[0]
+		rootDir, err := findRootDir(pluginDir)
+		if err != nil {
+			return err
+		}
+		pluginJSONDir, err := findPluginJSONDir(pluginDir)
+		if err != nil {
+			return err
+		}
+		buildPlugin(rootDir, pluginJSONDir)
+	}
+	return nil
+}
+
+// Default configures the default target.
+var Default = BuildAllPlugins