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folder_support.go
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/
folder_support.go
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package sqlstash
import (
"context"
"encoding/json"
"github.com/grafana/grafana/pkg/services/sqlstore/session"
"github.com/grafana/grafana/pkg/services/store/entity"
)
type folderInfo struct {
UID string `json:"uid"`
Name string `json:"name"` // original display name
Slug string `json:"slug"` // full slug
// original slug
originalSlug string
depth int32
left int32
right int32
// Build the tree
parentUID string
// Calculated after query
parent *folderInfo
children []*folderInfo
stack []*folderInfo
}
// This will replace all entries in `entity_folder`
// This is pretty heavy weight, but it does give us a sorted folder list
// NOTE: this could be done async with a mutex/lock? reconciler pattern
func updateFolderTree(ctx context.Context, tx *session.SessionTx, tenant int64) error {
_, err := tx.Exec(ctx, "DELETE FROM entity_folder WHERE tenant_id=?", tenant)
if err != nil {
return err
}
all := []*folderInfo{}
rows, err := tx.Query(ctx, "SELECT uid,folder,name,slug FROM entity WHERE kind=? AND tenant_id=? ORDER BY slug asc;",
entity.StandardKindFolder, tenant)
if err != nil {
return err
}
for rows.Next() {
folder := folderInfo{
children: []*folderInfo{},
}
err = rows.Scan(&folder.UID, &folder.parentUID, &folder.Name, &folder.originalSlug)
if err != nil {
break
}
all = append(all, &folder)
}
errClose := rows.Close()
// TODO: Use some kind of multi-error.
// Until then, we want to prioritize errors coming from the .Scan
// over those coming from .Close.
if err != nil {
return err
}
if errClose != nil {
return errClose
}
root, lost, err := buildFolderTree(all)
if err != nil {
return err
}
err = insertFolderInfo(ctx, tx, tenant, root, false)
if err != nil {
return err
}
for _, folder := range lost {
err = insertFolderInfo(ctx, tx, tenant, folder, true)
if err != nil {
return err
}
}
return err
}
func buildFolderTree(all []*folderInfo) (*folderInfo, []*folderInfo, error) {
lost := []*folderInfo{}
lookup := make(map[string]*folderInfo)
for _, folder := range all {
lookup[folder.UID] = folder
}
root := &folderInfo{
Name: "Root",
UID: "",
children: []*folderInfo{},
left: 1,
}
lookup[""] = root
// already sorted by slug
for _, folder := range all {
parent, ok := lookup[folder.parentUID]
if ok {
folder.parent = parent
parent.children = append(parent.children, folder)
} else {
lost = append(lost, folder)
}
}
_, err := setMPTTOrder(root, []*folderInfo{}, int32(1))
return root, lost, err
}
// https://imrannazar.com/Modified-Preorder-Tree-Traversal
func setMPTTOrder(folder *folderInfo, stack []*folderInfo, idx int32) (int32, error) {
var err error
folder.depth = int32(len(stack))
folder.left = idx
folder.stack = stack
if folder.depth > 0 {
folder.Slug = "/"
for _, f := range stack {
folder.Slug += f.originalSlug + "/"
}
}
for _, child := range folder.children {
idx, err = setMPTTOrder(child, append(stack, child), idx+1)
if err != nil {
return idx, err
}
}
folder.right = idx + 1
return folder.right, nil
}
func insertFolderInfo(ctx context.Context, tx *session.SessionTx, tenant int64, folder *folderInfo, isDetached bool) error {
js, _ := json.Marshal(folder.stack)
grn := entity.GRN{TenantId: tenant, Kind: entity.StandardKindFolder, UID: folder.UID}
_, err := tx.Exec(ctx,
`INSERT INTO entity_folder `+
"(grn, tenant_id, uid, slug_path, tree, depth, left, right, detached) "+
`VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
grn.ToGRNString(),
tenant,
folder.UID,
folder.Slug,
string(js),
folder.depth,
folder.left,
folder.right,
isDetached,
)
if err != nil {
return err
}
for _, sub := range folder.children {
err := insertFolderInfo(ctx, tx, tenant, sub, isDetached)
if err != nil {
return err
}
}
return nil
}