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link_dao.go
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link_dao.go
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package sqlite
import (
"database/sql"
"fmt"
"github.com/mickael-menu/zk/internal/core"
"github.com/mickael-menu/zk/internal/util"
)
// LinkDAO persists links in the SQLite database.
type LinkDAO struct {
tx Transaction
logger util.Logger
// Prepared SQL statements
addLinkStmt *LazyStmt
setLinksTargetStmt *LazyStmt
removeLinksStmt *LazyStmt
}
// NewLinkDAO creates a new instance of a DAO working on the given database
// transaction.
func NewLinkDAO(tx Transaction, logger util.Logger) *LinkDAO {
return &LinkDAO{
tx: tx,
logger: logger,
// Add a new link.
addLinkStmt: tx.PrepareLazy(`
INSERT INTO links (source_id, target_id, title, href, type, external, rels, snippet, snippet_start, snippet_end)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
`),
// Set links matching a given href and missing a target ID to the given
// target ID.
setLinksTargetStmt: tx.PrepareLazy(`
UPDATE links
SET target_id = ?
WHERE target_id IS NULL AND external = 0 AND ? LIKE href || '%'
`),
// Remove all the outbound links of a note.
removeLinksStmt: tx.PrepareLazy(`
DELETE FROM links
WHERE source_id = ?
`),
}
}
// Add inserts all the outbound links of the given note.
func (d *LinkDAO) Add(links []core.ResolvedLink) error {
for _, link := range links {
sourceID := noteIDToSQL(link.SourceID)
targetID := noteIDToSQL(link.TargetID)
_, err := d.addLinkStmt.Exec(sourceID, targetID, link.Title, link.Href, link.Type, link.IsExternal, joinLinkRels(link.Rels), link.Snippet, link.SnippetStart, link.SnippetEnd)
if err != nil {
return err
}
}
return nil
}
// RemoveAll removes all the outbound links of the given note.
func (d *LinkDAO) RemoveAll(id core.NoteID) error {
_, err := d.removeLinksStmt.Exec(noteIDToSQL(id))
return err
}
// SetTargetID updates the missing target_id for links matching the given href.
// FIXME: Probably doesn't work for all type of href (partial, wikilinks, etc.)
func (d *LinkDAO) SetTargetID(href string, id core.NoteID) error {
_, err := d.setLinksTargetStmt.Exec(int64(id), href)
return err
}
// joinLinkRels will concatenate a list of rels into a SQLite ready string.
// Each rel is delimited by \x01 for easy matching in queries.
func joinLinkRels(rels []core.LinkRelation) string {
if len(rels) == 0 {
return ""
}
delimiter := "\x01"
res := delimiter
for _, rel := range rels {
res += string(rel) + delimiter
}
return res
}
func (d *LinkDAO) FindBetweenNotes(ids []core.NoteID) ([]core.ResolvedLink, error) {
links := make([]core.ResolvedLink, 0)
idsString := joinNoteIDs(ids, ",")
rows, err := d.tx.Query(fmt.Sprintf(`
SELECT id, source_id, source_path, target_id, target_path, title, href, type, external, rels, snippet, snippet_start, snippet_end
FROM resolved_links
WHERE source_id IN (%s) AND target_id IN (%s)
`, idsString, idsString))
if err != nil {
return links, err
}
defer rows.Close()
for rows.Next() {
link, err := d.scanLink(rows)
if err != nil {
d.logger.Err(err)
continue
}
if link != nil {
links = append(links, *link)
}
}
return links, nil
}
func (d *LinkDAO) scanLink(row RowScanner) (*core.ResolvedLink, error) {
var (
id, sourceID, targetID, snippetStart, snippetEnd int
sourcePath, targetPath, title, href, linkType, snippet string
external bool
rels sql.NullString
)
err := row.Scan(
&id, &sourceID, &sourcePath, &targetID, &targetPath, &title, &href,
&linkType, &external, &rels, &snippet, &snippetStart, &snippetEnd,
)
switch {
case err == sql.ErrNoRows:
return nil, nil
case err != nil:
return nil, err
default:
return &core.ResolvedLink{
SourceID: core.NoteID(sourceID),
SourcePath: sourcePath,
TargetID: core.NoteID(targetID),
TargetPath: targetPath,
Link: core.Link{
Title: title,
Href: href,
Type: core.LinkType(linkType),
IsExternal: external,
Rels: core.LinkRels(parseListFromNullString(rels)...),
Snippet: snippet,
SnippetStart: snippetStart,
SnippetEnd: snippetEnd,
},
}, nil
}
}