replace modules with go plugins.

internal/plugins/manager.go

@@ -0,0 +1,108 @@
+package plugins
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"plugin"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/cobra"
+
+	"gitlab.com/demodesk/neko/server/internal/config"
+	"gitlab.com/demodesk/neko/server/pkg/types"
+)
+
+type PluginsManagerCtx struct {
+	logger  zerolog.Logger
+	plugins map[string]types.Plugin
+}
+
+func New(config *config.Plugins) *PluginsManagerCtx {
+	manager := &PluginsManagerCtx{
+		logger:  log.With().Str("module", "plugins").Logger(),
+		plugins: map[string]types.Plugin{},
+	}
+
+	if config.Enabled {
+		err := manager.loadDir(config.Dir)
+		manager.logger.Err(err).Msgf("loading finished, total %d plugins", len(manager.plugins))
+	}
+
+	return manager
+}
+
+func (manager *PluginsManagerCtx) loadDir(dir string) error {
+	return filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			return nil
+		}
+
+		err = manager.load(path)
+		manager.logger.Err(err).Str("plugin", path).Msg("loading a plugin")
+
+		return nil
+	})
+}
+
+func (manager *PluginsManagerCtx) load(path string) error {
+	pl, err := plugin.Open(path)
+	if err != nil {
+		return err
+	}
+
+	sym, err := pl.Lookup("Plugin")
+	if err != nil {
+		return err
+	}
+
+	p, ok := sym.(types.Plugin)
+	if !ok {
+		return fmt.Errorf("not a valid plugin")
+	}
+
+	manager.plugins[path] = p
+	return nil
+}
+
+func (manager *PluginsManagerCtx) InitConfigs(cmd *cobra.Command) {
+	for path, plug := range manager.plugins {
+		if err := plug.Config().Init(cmd); err != nil {
+			log.Err(err).Str("plugin", path).Msg("unable to initialize configuration")
+		}
+	}
+}
+
+func (manager *PluginsManagerCtx) SetConfigs() {
+	for _, plug := range manager.plugins {
+		plug.Config().Set()
+	}
+}
+
+func (manager *PluginsManagerCtx) Start(
+	sessionManager types.SessionManager,
+	webSocketManager types.WebSocketManager,
+	apiManager types.ApiManager,
+) {
+	for _, plug := range manager.plugins {
+		plug.Start(types.PluginManagers{
+			SessionManager:   sessionManager,
+			WebSocketManager: webSocketManager,
+			ApiManager:       apiManager,
+		})
+	}
+}
+
+func (manager *PluginsManagerCtx) Shutdown() error {
+	for path, plug := range manager.plugins {
+		err := plug.Shutdown()
+		manager.logger.Err(err).Str("plugin", path).Msg("plugin shutdown")
+	}
+
+	return nil
+}