refactor packages, update go.mod, and add config validator

.gitignore

@@ -1,19 +1,29 @@
+# Swap files
+*.swp
+
 # Toolchain
-# Goland project folder
+# Golang project folder
 .idea/
+
 # Visual Studio Code
 .vscode/
+
+# Build
+build/
+log/
+vendor/
+
 # emacs/vim
 GPATH
 GRTAGS
 GTAGS
 TAGS
 tags
 cscope.*
-# mac
+
+# macOS
 .DS_Store
 
-# debug
+# Debug
 *.log
 *.pcap
-

.golangci.yml

@@ -29,12 +29,6 @@ run:
   # "/" will be replaced by current OS file path separator to properly work
   # on Windows.
   skip-files:
-    - "api_.*\\.go$"
-    - "model_.*\\.go$"
-    - "routers.go"
-    - "client.go"
-    - "configuration.go"
-    - "nas.go"
   # by default isn't set. If set we pass it to "go list -mod={option}". From "go help modules":
   # If invoked with -mod=readonly, the go command is disallowed from the implicit
   # automatic updating of go.mod described above. Instead, it fails when any changes
@@ -249,13 +243,14 @@ linters:
     # Additional
     - lll
     - godox
-    #- gomnd
-    #- goconst
+    # - gomnd
+    # - goconst
     # - gocognit
     # - maligned
     # - nestif
     # - gomodguard
     - nakedret
+    # - golint
     - gci
     - misspell
     - gofumpt
@@ -266,9 +261,9 @@ linters:
     - dogsled
     - bodyclose
     - asciicheck
-      #- stylecheck
-      # - unparam
-      # - wsl
+    # - stylecheck
+    # - unparam
+    # - wsl
 
   #disable-all: false
   fast: true

cmd/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime/debug"
+
+	"github.com/asaskevich/govalidator"
+	"github.com/urfave/cli"
+
+	"github.com/free5gc/amf/internal/logger"
+	"github.com/free5gc/amf/internal/util"
+	"github.com/free5gc/amf/pkg/service"
+	"github.com/free5gc/util/version"
+)
+
+var AMF = &service.AMF{}
+
+func main() {
+	defer func() {
+		if p := recover(); p != nil {
+			// Print stack for panic to log. Fatalf() will let program exit.
+			logger.AppLog.Fatalf("panic: %v\n%s", p, string(debug.Stack()))
+		}
+	}()
+
+	app := cli.NewApp()
+	app.Name = "amf"
+	app.Usage = "5G Access and Mobility Management Function (AMF)"
+	app.Action = action
+	app.Flags = AMF.GetCliCmd()
+	if err := app.Run(os.Args); err != nil {
+		logger.AppLog.Errorf("AMF Run error: %v\n", err)
+		return
+	}
+}
+
+func action(c *cli.Context) error {
+	if err := initLogFile(c.String("log"), c.String("log5gc")); err != nil {
+		logger.AppLog.Errorf("%+v", err)
+		return err
+	}
+
+	if err := AMF.Initialize(c); err != nil {
+		switch err1 := err.(type) {
+		case govalidator.Errors:
+			errs := err1.Errors()
+			for _, e := range errs {
+				logger.CfgLog.Errorf("%+v", e)
+			}
+		default:
+			logger.CfgLog.Errorf("%+v", err)
+		}
+
+		logger.CfgLog.Errorf("[-- PLEASE REFER TO SAMPLE CONFIG FILE COMMENTS --]")
+		return fmt.Errorf("Failed to initialize !!")
+	}
+
+	logger.AppLog.Infoln(c.App.Name)
+	logger.AppLog.Infoln("AMF version: ", version.GetVersion())
+
+	AMF.Start()
+
+	return nil
+}
+
+func initLogFile(logNfPath, log5gcPath string) error {
+	AMF.KeyLogPath = util.AmfDefaultKeyLogPath
+
+	if err := logger.LogFileHook(logNfPath, log5gcPath); err != nil {
+		return err
+	}
+
+	if logNfPath != "" {
+		nfDir, _ := filepath.Split(logNfPath)
+		tmpDir := filepath.Join(nfDir, "key")
+		if err := os.MkdirAll(tmpDir, 0o775); err != nil {
+			logger.InitLog.Errorf("Make directory %s failed: %+v", tmpDir, err)
+			return err
+		}
+		_, name := filepath.Split(util.AmfDefaultKeyLogPath)
+		AMF.KeyLogPath = filepath.Join(tmpDir, name)
+	}
+
+	return nil
+}