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db.go
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db.go
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package main
import (
_ "embed"
"time"
"crawshaw.io/sqlite"
"crawshaw.io/sqlite/sqlitex"
"github.com/andrewpillar/query"
)
//go:embed schema.sql
var schema string
type DB struct {
*sqlite.Conn
}
func InitDB() (DB, error) {
var db DB
conn, err := sqlite.OpenConn(":memory:", sqlite.SQLITE_OPEN_READWRITE)
if err != nil {
return db, err
}
if err := sqlitex.ExecScript(conn, schema); err != nil {
return db, err
}
return DB{
Conn: conn,
}, nil
}
var (
insertImg = `
INSERT INTO images
(path, driver, category, group_name, name, link, mod_time)
VALUES ($1, $2, $3, $4, $5, $6, $7)
`
updateImg = `
UPDATE images
SET mod_time = $1, link = $2
WHERE (path = $3)
`
)
func (db DB) Load(imgs []*Image) error {
for _, img := range imgs {
stmt, err := db.Prepare(insertImg)
if err != nil {
return err
}
stmt.BindText(1, img.Path)
stmt.BindText(2, img.Driver)
stmt.BindText(3, img.Category)
stmt.BindText(4, img.Group)
stmt.BindText(5, img.Name)
stmt.BindText(6, img.Link)
stmt.BindInt64(7, img.ModTime.Unix())
if _, err := stmt.Step(); err != nil {
sqlerr, _ := err.(sqlite.Error)
if sqlerr.Code == sqlite.SQLITE_CONSTRAINT_UNIQUE {
stmt, err := db.Prepare(updateImg)
if err != nil {
return err
}
stmt.BindInt64(1, img.ModTime.Unix())
stmt.BindText(2, img.Link)
stmt.BindText(3, img.Path)
if _, err := stmt.Step(); err != nil {
return err
}
if err := stmt.ClearBindings(); err != nil {
return err
}
continue
}
}
if err := stmt.ClearBindings(); err != nil {
return err
}
}
return nil
}
func (db DB) Sync(imgs []*Image) (int, error) {
nop := func(_ *sqlite.Stmt) error { return nil }
paths := make([]interface{}, 0, len(imgs))
for _, img := range imgs {
paths = append(paths, img.Path)
}
q := query.Delete("images", query.Where("path", "NOT IN", query.List(paths...)))
if err := sqlitex.Exec(db.Conn, q.Build(), nop, q.Args()...); err != nil {
return 0, err
}
set := make(map[string]int64)
scan := func(stmt *sqlite.Stmt) error {
set[stmt.ColumnText(0)] = stmt.ColumnInt64(1)
return nil
}
if err := sqlitex.Exec(db.Conn, "SELECT path, mod_time FROM images", scan); err != nil {
return 0, err
}
new := make([]*Image, 0, len(imgs))
for _, img := range imgs {
if mod, ok := set[img.Path]; ok {
if mod == img.ModTime.Unix() {
continue
}
}
new = append(new, img)
}
if err := db.Load(new); err != nil {
return 0, err
}
return len(new), nil
}
func WhereDriver(driver string) query.Option {
return func(q query.Query) query.Query {
if driver == "" {
return q
}
return query.Where("driver", "=", query.Arg(driver))(q)
}
}
func WhereCategory(category string) query.Option {
return func(q query.Query) query.Query {
if category == "" {
return q
}
return query.Where("category", "=", query.Arg(category))(q)
}
}
func WhereGroup(group string) query.Option {
return func(q query.Query) query.Query {
if group == "" {
return q
}
return query.Where("group_name", "=", query.Arg(group))(q)
}
}
var imageCols = []string{
"path",
"driver",
"category",
"group_name",
"name",
"link",
"mod_time",
}
func scanImage(img *Image) func(*sqlite.Stmt) error {
return func(stmt *sqlite.Stmt) error {
modtime := stmt.ColumnInt64(6)
img.Path = stmt.ColumnText(0)
img.Driver = stmt.ColumnText(1)
img.Category = stmt.ColumnText(2)
img.Group = stmt.ColumnText(3)
img.Name = stmt.ColumnText(4)
img.Link = stmt.ColumnText(5)
img.ModTime = time.Unix(modtime, 0)
return nil
}
}
func (db DB) Image(driver, category, name string) (*Image, bool, error) {
q := query.Select(
query.Columns(imageCols...),
query.From("images"),
query.Where("driver", "=", query.Arg(driver)),
query.Where("category", "=", query.Arg(category)),
query.Where("name", "=", query.Arg(name)),
)
var img Image
if err := sqlitex.Exec(db.Conn, q.Build(), scanImage(&img), q.Args()...); err != nil {
if err, ok := err.(sqlite.Error); ok && err.Code == sqlite.SQLITE_NOTFOUND {
return nil, false, nil
}
return nil, false, err
}
return &img, img.Path != "", nil
}
func (db DB) Images(opts ...query.Option) ([]*Image, error) {
opts = append([]query.Option{
query.From("images"),
}, opts...)
q := query.Select(query.Columns(imageCols...), opts...)
imgs := make([]*Image, 0)
set := make(map[string]*Image)
paths := make([]interface{}, 0)
scan := func(stmt *sqlite.Stmt) error {
img := &Image{}
if err := scanImage(img)(stmt); err != nil {
return err
}
set[img.Path] = img
paths = append(paths, img.Path)
imgs = append(imgs, img)
return nil
}
if err := sqlitex.Exec(db.Conn, q.Build(), scan, q.Args()...); err != nil {
return nil, err
}
return imgs, nil
}