feat: proxmox idlewatcher (#88)

* feat: idle sleep for proxmox LXCs

* refactor: replace deprecated docker api types

* chore(api): remove debug task list endpoint

* refactor: move servemux to gphttp/servemux; favicon.go to v1/favicon

* refactor: introduce Pool interface, move agent_pool to agent module

* refactor: simplify api code

* feat: introduce debug api

* refactor: remove net.URL and net.CIDR types, improved unmarshal handling

* chore: update Makefile for debug build tag, update README

* chore: add gperr.Unwrap method

* feat: relative time and duration formatting

* chore: add ROOT_DIR environment variable, refactor

* migration: move homepage override and icon cache to $BASE_DIR/data, add migration code

* fix: nil dereference on marshalling service health

* fix: wait for route deletion

* chore: enhance tasks debuggability

* feat: stdout access logger and MultiWriter

* fix(agent): remove agent properly on verify error

* fix(metrics): disk exclusion logic and added corresponding tests

* chore: update schema and prettify, fix package.json and Makefile

* fix: I/O buffer not being shrunk before putting back to pool

* feat: enhanced error handling module

* chore: deps upgrade

* feat: better value formatting and handling

---------

Co-authored-by: yusing <yusing@6uo.me>

pkg/version.go

@@ -1,7 +1,116 @@
 package pkg
 
-var version = "unset"
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
 
-func GetVersion() string {
-	return version
+	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/logging"
+)
+
+func GetVersion() Version {
+	return currentVersion
+}
+
+func GetLastVersion() Version {
+	return lastVersion
+}
+
+func init() {
+	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")
+		return
+	}
+	if err := f.Truncate(0); err != nil {
+		logging.Warn().Err(err).Msg("failed to truncate version file")
+		return
+	}
+	_, err = f.WriteString(version)
+	if err != nil {
+		logging.Warn().Err(err).Msg("failed to save version file")
+		return
+	}
+}
+
+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)
+}
+
+func (v Version) MarshalText() ([]byte, error) {
+	return []byte(v.String()), nil
+}
+
+func (v Version) IsNewerThan(other Version) bool {
+	if v.Major != other.Major {
+		return v.Major > other.Major
+	}
+	if v.Minor != other.Minor {
+		return v.Minor > other.Minor
+	}
+	return v.Patch > other.Patch
+}
+
+func (v Version) IsOlderThan(other Version) bool {
+	if v.Major != other.Major {
+		return v.Major < other.Major
+	}
+	if v.Minor != other.Minor {
+		return v.Minor < other.Minor
+	}
+	return v.Patch < other.Patch
+}
+
+func (v Version) IsEqual(other Version) bool {
+	return v.Major == other.Major && v.Minor == other.Minor && v.Patch == other.Patch
+}
+
+var (
+	version        = "unset"
+	currentVersion Version
+	lastVersion    Version
+)
+
+func parseVersion(v string) (ver Version) {
+	if v == "" {
+		return
+	}
+
+	v = strings.Split(v, "-")[0]
+	v = strings.TrimPrefix(v, "v")
+	parts := strings.Split(v, ".")
+	if len(parts) != 3 {
+		return
+	}
+	major, err := strconv.Atoi(parts[0])
+	if err != nil {
+		return
+	}
+	minor, err := strconv.Atoi(parts[1])
+	if err != nil {
+		return
+	}
+	patch, err := strconv.Atoi(parts[2])
+	if err != nil {
+		return
+	}
+	return Ver(major, minor, patch)
 }