feat: multiple search indexes (#2514)

* refactor: abstract search interface

* wip: ~

* fix cycle import

* objs update hook

* wip: ~

* Delete search/none

* auto update index while cache changed

* db searcher

TODO: bleve init issue

cannot open index, metadata missing

* fix size type

why float64??

* fix typo

* fix nil pointer using

* api adapt ui

* bleve: fix clear & change struct

internal/db/searchnode.go

@@ -0,0 +1,49 @@
+package db
+
+import (
+	"fmt"
+
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/pkg/errors"
+)
+
+func CreateSearchNode(node *model.SearchNode) error {
+	return db.Create(node).Error
+}
+
+func DeleteSearchNodesByParent(parent string) error {
+	return db.Where(fmt.Sprintf("%s LIKE ?",
+		columnName("path")), fmt.Sprintf("%s%%", parent)).
+		Delete(&model.SearchNode{}).Error
+}
+
+func ClearSearchNodes() error {
+	return db.Where("1 = 1").Delete(&model.SearchNode{}).Error
+}
+
+func GetSearchNodesByParent(parent string) ([]model.SearchNode, error) {
+	var nodes []model.SearchNode
+	if err := db.Where(fmt.Sprintf("%s = ?",
+		columnName("parent")), parent).Find(&nodes).Error; err != nil {
+		return nil, err
+	}
+	return nodes, nil
+}
+
+func SearchNode(req model.SearchReq) ([]model.SearchNode, int64, error) {
+	searchDB := db.Model(&model.SearchNode{}).Where(
+		fmt.Sprintf("%s LIKE ? AND %s LIKE ?",
+			columnName("parent"),
+			columnName("name")),
+		fmt.Sprintf("%s%%", req.Parent),
+		fmt.Sprintf("%%%s%%", req.Keywords))
+	var count int64
+	if err := searchDB.Count(&count).Error; err != nil {
+		return nil, 0, errors.Wrapf(err, "failed get users count")
+	}
+	var files []model.SearchNode
+	if err := searchDB.Offset((req.Page - 1) * req.PerPage).Limit(req.PerPage).Find(&files).Error; err != nil {
+		return nil, 0, err
+	}
+	return files, count, nil
+}