chore: cont fa16f415

pkg/version.go

@@ -2,20 +2,49 @@ package pkg
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
+
+	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/logging"
 )
 
 func GetVersion() Version {
-	return Version{Major: major, Minor: minor, Patch: patch}
+	return currentVersion
+}
+
+func GetLastVersion() Version {
+	return lastVersion
 }
 
 func init() {
-	major, minor, patch = parseVersion(version)
+	currentVersion = parseVersion(version)
+
+	// ignore errors
+	versionFile := filepath.Join(common.DataDir, "version")
+	var lastVersionStr string
+	f, err := os.OpenFile(versionFile, os.O_RDWR|os.O_CREATE, 0o644)
+	if err == nil {
+		_, err = fmt.Fscanf(f, "%s", &lastVersionStr)
+		lastVersion = parseVersion(lastVersionStr)
+	}
+	if err != nil && !os.IsNotExist(err) {
+		logging.Warn().Err(err).Msg("failed to read version file")
+	}
+	_, err = f.WriteString(version)
+	if err != nil {
+		logging.Warn().Err(err).Msg("failed to save version file")
+	}
 }
 
 type Version struct{ Major, Minor, Patch int }
 
+func Ver(major, minor, patch int) Version {
+	return Version{major, minor, patch}
+}
+
 func (v Version) String() string {
 	return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
 }
@@ -49,11 +78,16 @@ func (v Version) IsEqual(other Version) bool {
 }
 
 var (
-	version             = "unset"
-	major, minor, patch int
+	version        = "unset"
+	currentVersion Version
+	lastVersion    Version
 )
 
-func parseVersion(v string) (major, minor, patch int) {
+func parseVersion(v string) (ver Version) {
+	if v == "" {
+		return
+	}
+
 	v = strings.Split(v, "-")[0]
 	v = strings.TrimPrefix(v, "v")
 	parts := strings.Split(v, ".")
@@ -64,13 +98,13 @@ func parseVersion(v string) (major, minor, patch int) {
 	if err != nil {
 		return
 	}
-	minor, err = strconv.Atoi(parts[1])
+	minor, err := strconv.Atoi(parts[1])
 	if err != nil {
 		return
 	}
-	patch, err = strconv.Atoi(parts[2])
+	patch, err := strconv.Atoi(parts[2])
 	if err != nil {
 		return
 	}
-	return
+	return Ver(major, minor, patch)
 }