cmt

storage/version.go

@@ -0,0 +1,149 @@
+package storage
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"strconv"
+
+	"git.dengqn.com/dqn/listversion/util"
+)
+
+/**
+VersionMeta
+
+data root --> file path bash	/
+								/ file version1
+								/ file version2
+								/ meta.json --> VersionMeta[]
+		  --> other config.json
+*/
+
+type FileMeta struct {
+	FileName     string    `json:"fileName"`
+	AbsolutePath string    `json:"absolutePath"`
+	NameHash     string    `json:"nameHash"`
+	Versions     []Version `json:"versions"`
+}
+
+type Version struct {
+	Version int64  `json:"version"`
+	Created int64  `json:"created"`
+	Desc    string `json:"desc"`
+}
+
+func Extract(fullPath string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(fullPath)
+	os.Remove(fullPath)
+	origin, _ := os.OpenFile(fullPath, os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	target, _ := os.OpenFile(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)), os.O_RDONLY, os.ModePerm)
+	io.Copy(origin, target)
+	origin.Close()
+	target.Close()
+}
+
+func SaveMeta(pathHex string, meta FileMeta) {
+	root, _ := os.UserConfigDir()
+
+	appRoot, err := os.Open(path.Join(root, "list-version"))
+	if err != nil {
+		fmt.Println("%s", "打开文件失败0"+err.Error())
+		if errors.Is(err, os.ErrNotExist) {
+			os.Mkdir(path.Join(root, "list-version"), os.ModePerm)
+		}
+	}
+
+	defer func() {
+		if appRoot != nil {
+			appRoot.Close()
+		}
+	}()
+
+	_, err = os.Open(path.Join(root, "list-version", pathHex))
+	// not saved yet
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			os.Mkdir(path.Join(root, "list-version", pathHex), os.ModePerm)
+		}
+	}
+
+	os.Remove(path.Join(root, "list-version", pathHex, "meta.json.bak"))
+	os.Rename(path.Join(root, "list-version", pathHex, "meta.json"), path.Join(root, "list-version", pathHex, "meta.json.bak"))
+	// meta.json
+	metaJsonFile, err := os.OpenFile(path.Join(root, "list-version", pathHex, "meta.json"), os.O_WRONLY, os.ModePerm)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			// 直接写
+			metaJsonFile, err = os.Create(path.Join(root, "list-version", pathHex, "meta.json"))
+		}
+	}
+	buf, err := json.Marshal(meta)
+	if err != nil {
+		fmt.Println("%s", "json"+err.Error())
+	}
+	metaJsonFile.Write(buf)
+	metaJsonFile.Sync()
+	metaJsonFile.Close()
+}
+
+func DeleteData(originFile string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(originFile)
+	os.Remove(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)))
+}
+
+func CopyData(originFile string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(originFile)
+
+	origin, _ := os.OpenFile(originFile, os.O_RDONLY, os.ModePerm)
+	target, _ := os.Create(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)))
+	io.Copy(target, origin)
+	origin.Close()
+	target.Close()
+}
+
+func GetVersionList(pathHex string) (meta FileMeta, err error) {
+
+	root, _ := os.UserConfigDir()
+
+	appRoot, err := os.Open(path.Join(root, "list-version"))
+	if errors.Is(err, os.ErrNotExist) {
+		os.Mkdir(path.Join(root, "list-version"), os.ModePerm)
+	}
+	defer func() {
+		if appRoot != nil {
+			appRoot.Close()
+		}
+	}()
+
+	fileMeta, err := os.Open(path.Join(root, "list-version", pathHex, "meta.json"))
+	// not saved yet
+	if errors.Is(err, os.ErrNotExist) {
+		return meta, errors.New("no versions")
+	}
+	defer fileMeta.Close()
+	// read meta.json
+
+	buf, _ := io.ReadAll(fileMeta)
+	json.Unmarshal(buf, &meta)
+
+	return meta, nil
+}
+
+func NewMeta(filePath string) (meta FileMeta) {
+
+	meta.AbsolutePath = filePath
+
+	st, _ := os.Stat(filePath)
+
+	meta.FileName = st.Name()
+	meta.NameHash = util.ToHashHex(filePath)
+	meta.Versions = make([]Version, 0)
+
+	return meta
+}