refactoring plugin generating code

pkg/config/plugin.go

@@ -0,0 +1,66 @@
+// VulcanizeDB
+// Copyright © 2018 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package config
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/vulcanize/vulcanizedb/pkg/plugin/helpers"
+)
+
+type Plugin struct {
+	Initializers map[string]string // Map of import aliases to transformer initializer paths
+	Dependencies map[string]string // Map of vendor dep names to their repositories
+	Migrations   map[string]string // Map of vendor dep names to relative path from repository to db migrations
+	FilePath     string
+	FileName     string
+	Save         bool
+}
+
+func (c *Plugin) GetPluginPaths() (string, string, error) {
+	path, err := helpers.CleanPath(c.FilePath)
+	if err != nil {
+		return "", "", err
+	}
+
+	name := strings.Split(c.FileName, ".")[0]
+	goFile := filepath.Join(path, name+".go")
+	soFile := filepath.Join(path, name+".so")
+
+	return goFile, soFile, nil
+}
+
+func (c *Plugin) GetMigrationsPaths() ([]string, error) {
+	paths := make([]string, 0, len(c.Migrations))
+	for key, relPath := range c.Migrations {
+		repo, ok := c.Dependencies[key]
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("migration %s with path %s missing repository", key, relPath))
+		}
+		path := filepath.Join("$GOPATH/src/github.com/vulcanize/vulcanizedb/vendor", repo, relPath)
+		cleanPath, err := helpers.CleanPath(path)
+		if err != nil {
+			return nil, err
+		}
+		paths = append(paths, cleanPath)
+	}
+
+	return paths, nil
+}