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|
package store
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path"
"strings"
"git.sr.ht/~rjarry/aerc/lib/log"
"git.sr.ht/~rjarry/aerc/lib/pama/models"
"git.sr.ht/~rjarry/aerc/lib/xdg"
"github.com/syndtr/goleveldb/leveldb"
)
const (
keyPrefix = "project."
)
var (
// versTag should be incremented when the underyling data structure
// changes.
versTag = []byte("0001")
versTagKey = []byte("version.tag")
currentKey = []byte("current.project")
)
func createKey(name string) []byte {
return []byte(keyPrefix + name)
}
func parseKey(key []byte) string {
return strings.TrimPrefix(string(key), keyPrefix)
}
func isProjectKey(key []byte) bool {
return bytes.HasPrefix(key, []byte(keyPrefix))
}
func cacheDir() (string, error) {
dir, err := os.UserCacheDir()
if err != nil {
dir = xdg.ExpandHome("~/.cache")
}
return path.Join(dir, "aerc"), nil
}
func openStorage() (*leveldb.DB, error) {
cd, err := cacheDir()
if err != nil {
return nil, fmt.Errorf("Unable to find project store directory: %w", err)
}
p := path.Join(cd, "projects")
db, err := leveldb.OpenFile(p, nil)
if err != nil {
return nil, fmt.Errorf("Unable to open project store: %w", err)
}
has, err := db.Has(versTagKey, nil)
if err != nil {
return nil, err
}
setTag := !has
if has {
vers, err := db.Get(versTagKey, nil)
if err != nil {
return nil, err
}
if !bytes.Equal(vers, versTag) {
log.Warnf("patch store: version mismatch: wipe data")
iter := db.NewIterator(nil, nil)
for iter.Next() {
err := db.Delete(iter.Key(), nil)
if err != nil {
log.Errorf("delete: %v")
}
}
iter.Release()
setTag = true
}
}
if setTag {
err := db.Put(versTagKey, versTag, nil)
if err != nil {
return nil, err
}
log.Infof("patch store: set version: %s", string(versTag))
}
return db, nil
}
func encode(p models.Project) ([]byte, error) {
return json.Marshal(p)
}
func decode(data []byte) (p models.Project, err error) {
err = json.Unmarshal(data, &p)
return
}
func Store() models.PersistentStorer {
return &instance{}
}
type instance struct{}
func (instance) StoreProject(p models.Project, overwrite bool) error {
db, err := openStorage()
if err != nil {
return err
}
defer db.Close()
key := createKey(p.Name)
has, err := db.Has(key, nil)
if err != nil {
return err
}
if has && !overwrite {
return fmt.Errorf("Project '%s' already exists.", p.Name)
}
log.Debugf("project data: %v", p)
encoded, err := encode(p)
if err != nil {
return err
}
return db.Put(key, encoded, nil)
}
func (instance) DeleteProject(name string) error {
db, err := openStorage()
if err != nil {
return err
}
defer db.Close()
key := createKey(name)
has, err := db.Has(key, nil)
if err != nil {
return err
}
if !has {
return fmt.Errorf("Project does not exist.")
}
return db.Delete(key, nil)
}
func (instance) CurrentName() (string, error) {
db, err := openStorage()
if err != nil {
return "", err
}
defer db.Close()
cur, err := db.Get(currentKey, nil)
if err != nil {
return "", err
}
return parseKey(cur), nil
}
func (instance) SetCurrent(name string) error {
db, err := openStorage()
if err != nil {
return err
}
defer db.Close()
key := createKey(name)
return db.Put(currentKey, key, nil)
}
func (instance) Current() (models.Project, error) {
db, err := openStorage()
if err != nil {
return models.Project{}, err
}
defer db.Close()
has, err := db.Has(currentKey, nil)
if err != nil {
return models.Project{}, err
}
if !has {
return models.Project{}, fmt.Errorf("No (current) project found; run 'project init' first.")
}
curProjectKey, err := db.Get(currentKey, nil)
if err != nil {
return models.Project{}, err
}
raw, err := db.Get(curProjectKey, nil)
if err != nil {
return models.Project{}, err
}
p, err := decode(raw)
if err != nil {
return models.Project{}, err
}
return p, nil
}
func (instance) Names() ([]string, error) {
db, err := openStorage()
if err != nil {
return nil, err
}
defer db.Close()
var names []string
iter := db.NewIterator(nil, nil)
for iter.Next() {
if !isProjectKey(iter.Key()) {
continue
}
names = append(names, parseKey(iter.Key()))
}
iter.Release()
return names, nil
}
func (instance) Project(name string) (models.Project, error) {
db, err := openStorage()
if err != nil {
return models.Project{}, err
}
defer db.Close()
raw, err := db.Get(createKey(name), nil)
if err != nil {
return models.Project{}, err
}
p, err := decode(raw)
if err != nil {
return models.Project{}, err
}
return p, nil
}
func (instance) Projects() ([]models.Project, error) {
var projects []models.Project
db, err := openStorage()
if err != nil {
return nil, err
}
defer db.Close()
iter := db.NewIterator(nil, nil)
for iter.Next() {
if !isProjectKey(iter.Key()) {
continue
}
p, err := decode(iter.Value())
if err != nil {
return nil, err
}
projects = append(projects, p)
}
iter.Release()
return projects, nil
}
|
