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datastore.go
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datastore.go
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package processor
import (
"database/sql"
"embed"
"errors"
"fmt"
"time"
"github.com/aleksasiriski/autoscan"
"github.com/aleksasiriski/autoscan/migrate"
// sqlite3 driver
_ "modernc.org/sqlite"
// postgresql driver
_ "github.com/lib/pq"
)
type datastore struct {
*sql.DB
dbType string
}
var (
//go:embed migrations/sqlite
migrationsSqlite embed.FS
)
var (
//go:embed migrations/postgres
migrationsPostgres embed.FS
)
func newDatastore(db *sql.DB, dbType string, mg *migrate.Migrator) (*datastore, error) {
switch dbType {
case "sqlite":
{
// migrations/sqlite
if err := mg.Migrate(&migrationsSqlite, "processor"); err != nil {
return nil, fmt.Errorf("migrate: %w", err)
}
}
case "postgres":
{
// migrations/postgres
if err := mg.Migrate(&migrationsPostgres, "processor"); err != nil {
return nil, fmt.Errorf("migrate: %w", err)
}
}
default:
return &datastore{}, fmt.Errorf("incorrect database type")
}
return &datastore{db, dbType}, nil
}
func sqlSelectVersion(dbType string) (string, error) {
switch dbType {
case "sqlite":
return "", nil
case "postgres":
return `SELECT version()`, nil
default:
return "", fmt.Errorf("incorrect database type")
}
}
func (store *datastore) SelectVersion() (string, error) {
sqlSelectVersion, err := sqlSelectVersion(store.dbType)
if err != nil {
return "", err
}
version := ""
if store.dbType != "sqlite" {
row := store.QueryRow(sqlSelectVersion)
err = row.Scan(&version)
if err != nil {
return version, fmt.Errorf("select version: %w", err)
}
}
return version, nil
}
func sqlUpsert(dbType string) (string, error) {
switch dbType {
case "sqlite":
return `
INSERT INTO scan (folder, priority, time)
VALUES (?, ?, ?)
ON CONFLICT (folder) DO UPDATE SET
priority = MAX(excluded.priority, scan.priority),
time = excluded.time
`, nil
case "postgres":
return `
INSERT INTO scan (folder, priority, time)
VALUES ($1, $2, $3)
ON CONFLICT (folder) DO UPDATE SET
priority = GREATEST(excluded.priority, scan.priority),
time = excluded.time
`, nil
default:
return "", fmt.Errorf("incorrect database type")
}
}
func (store *datastore) upsert(tx *sql.Tx, dbType string, scan autoscan.Scan) error {
sqlUpsert, err := sqlUpsert(dbType)
if err != nil {
return err
}
_, err = tx.Exec(sqlUpsert, scan.Folder, scan.Priority, scan.Time)
return err
}
func (store *datastore) Upsert(scans []autoscan.Scan) error {
tx, err := store.Begin()
if err != nil {
return err
}
for _, scan := range scans {
if err = store.upsert(tx, store.dbType, scan); err != nil {
if rollbackErr := tx.Rollback(); rollbackErr != nil {
panic(rollbackErr)
}
return err
}
}
return tx.Commit()
}
const sqlGetScansRemaining = `SELECT COUNT(folder) FROM scan`
func (store *datastore) GetScansRemaining() (int, error) {
row := store.QueryRow(sqlGetScansRemaining)
remaining := 0
err := row.Scan(&remaining)
switch {
case errors.Is(err, sql.ErrNoRows):
return remaining, nil
case err != nil:
return remaining, fmt.Errorf("get remaining scans: %v: %w", err, autoscan.ErrFatal)
}
return remaining, nil
}
func sqlGetAvailableScan(dbType string) (string, error) {
switch dbType {
case "sqlite":
return `
SELECT folder, priority, time FROM scan
WHERE time < ?
ORDER BY priority DESC, time ASC
LIMIT 1
`, nil
case "postgres":
return `
SELECT folder, priority, time FROM scan
WHERE time < $1
ORDER BY priority DESC, time ASC
LIMIT 1
`, nil
default:
return "", fmt.Errorf("incorrect database type")
}
}
func (store *datastore) GetAvailableScan(minAge time.Duration) (autoscan.Scan, error) {
scan := autoscan.Scan{}
sqlGetAvailableScan, err := sqlGetAvailableScan(store.dbType)
if err != nil {
return scan, err
}
row := store.QueryRow(sqlGetAvailableScan, now().Add(-1*minAge))
err = row.Scan(&scan.Folder, &scan.Priority, &scan.Time)
switch {
case errors.Is(err, sql.ErrNoRows):
return scan, autoscan.ErrNoScans
case err != nil:
return scan, fmt.Errorf("get matching: %s: %w", err, autoscan.ErrFatal)
}
return scan, nil
}
const sqlGetAll = `
SELECT folder, priority, time FROM scan
`
func (store *datastore) GetAll() (scans []autoscan.Scan, err error) {
rows, err := store.Query(sqlGetAll)
if err != nil {
return scans, err
}
defer rows.Close()
for rows.Next() {
scan := autoscan.Scan{}
err = rows.Scan(&scan.Folder, &scan.Priority, &scan.Time)
if err != nil {
return scans, err
}
scans = append(scans, scan)
}
return scans, rows.Err()
}
func sqlDelete(dbType string) (string, error) {
switch dbType {
case "sqlite":
return `DELETE FROM scan WHERE folder=?`, nil
case "postgres":
return `DELETE FROM scan WHERE folder=$1`, nil
default:
return "", fmt.Errorf("incorrect database type")
}
}
func (store *datastore) Delete(scan autoscan.Scan) error {
sqlDelete, err := sqlDelete(store.dbType)
if err != nil {
return fmt.Errorf("delete: %s: %w", err, autoscan.ErrFatal)
}
_, err = store.Exec(sqlDelete, scan.Folder)
if err != nil {
return fmt.Errorf("delete: %s: %w", err, autoscan.ErrFatal)
}
return nil
}
var now = time.Now