Create configuration package for tool configuration

Moving the configuration file handling code to a dedicated internal package will make it avaiable for use by any of the
module's packages.

Author: per1234

internal/configuration/configuration.go

@@ -0,0 +1,64 @@
+// This file is part of libraries-repository-engine.
+//
+// Copyright 2021 ARDUINO SA (http://www.arduino.cc/)
+//
+// 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 <https://www.gnu.org/licenses/>.
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to [email protected].
+
+// Package configuration handles the tool configuration.
+package configuration
+
+import (
+	"encoding/json"
+	"os"
+
+	"github.com/arduino/libraries-repository-engine/internal/feedback"
+)
+
+// Config is the type of the engine configuration.
+type Config struct {
+	BaseDownloadURL string
+	LibrariesFolder string
+	LogsFolder      string
+	LibrariesDB     string
+	LibrariesIndex  string
+	GitClonesFolder string
+	DoNotRunClamav  bool
+	ArduinoLintPath string
+}
+
+// ReadConf reads the configuration file and returns the data.
+func ReadConf(configFile string) *Config {
+	if _, err := os.Stat(configFile); os.IsNotExist(err) {
+		feedback.LogError(err)
+		os.Exit(1)
+	}
+
+	file, err := os.Open(configFile)
+	if feedback.LogError(err) {
+		os.Exit(1)
+	}
+	decoder := json.NewDecoder(file)
+	config := Config{}
+	err = decoder.Decode(&config)
+	if feedback.LogError(err) {
+		os.Exit(1)
+	}
+	return &config
+}

sync_libraries.go

@@ -33,6 +33,7 @@ import (
 	"path/filepath"
 
 	cc "github.com/arduino/golang-concurrent-workers"
+	"github.com/arduino/libraries-repository-engine/internal/configuration"
 	"github.com/arduino/libraries-repository-engine/internal/feedback"
 	"github.com/arduino/libraries-repository-engine/internal/libraries"
 	"github.com/arduino/libraries-repository-engine/internal/libraries/db"
@@ -41,19 +42,7 @@ import (
 	"github.com/go-git/go-git/v5/plumbing"
 )
 
-// Config is the type of the engine configuration.
-type Config struct {
-	BaseDownloadURL string
-	LibrariesFolder string
-	LogsFolder      string
-	LibrariesDB     string
-	LibrariesIndex  string
-	GitClonesFolder string
-	DoNotRunClamav  bool
-	ArduinoLintPath string
-}
-
-var config *Config
+var config *configuration.Config
 
 func main() {
 	var configFile string
@@ -63,7 +52,7 @@ func main() {
 		configFile = "./config.json"
 	}
 
-	config = readConf(configFile)
+	config = configuration.ReadConf(configFile)
 
 	setup(config)
 
@@ -166,7 +155,7 @@ func serializeLibraryIndex(libraryIndex interface{}, libraryIndexFile string) {
 	}
 }
 
-func readConf(configFile string) *Config {
+func readConf(configFile string) *configuration.Config {
 	if _, err := os.Stat(configFile); os.IsNotExist(err) {
 		feedback.LogError(err)
 		os.Exit(1)
@@ -177,15 +166,15 @@ func readConf(configFile string) *Config {
 		os.Exit(1)
 	}
 	decoder := json.NewDecoder(file)
-	config := Config{}
+	config := configuration.Config{}
 	err = decoder.Decode(&config)
 	if feedback.LogError(err) {
 		os.Exit(1)
 	}
 	return &config
 }
 
-func setup(config *Config) {
+func setup(config *configuration.Config) {
 	err := os.MkdirAll(config.GitClonesFolder, os.FileMode(0777))
 	if feedback.LogError(err) {
 		os.Exit(1)