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|
package dbx
import (
"database/sql"
"fmt"
"io/fs"
"log"
"reflect"
"sort"
"strings"
"git.thomasvoss.com/euro-cash.eu/pkg/atexit"
. "git.thomasvoss.com/euro-cash.eu/pkg/try"
"github.com/mattn/go-sqlite3"
)
var (
db *sql.DB
DBName string
)
func Init(sqlDir fs.FS) {
db = Try2(sql.Open("sqlite3", DBName))
Try(db.Ping())
atexit.Register(Close)
Try(applyMigrations(sqlDir))
/* TODO: Remove debug code */
Try(CreateUser(User{
Email: "mail@thomasvoss.com",
Username: "Thomas",
Password: "69",
AdminP: true,
}))
Try(CreateUser(User{
Email: "foo@BAR.baz",
Username: "Foobar",
Password: "420",
AdminP: false,
}))
Try2(GetMintages("ad"))
}
func Close() {
db.Close()
}
func applyMigrations(dir fs.FS) error {
var latest int
migratedp := true
rows, err := db.Query("SELECT latest FROM migration")
if err != nil {
e, ok := err.(sqlite3.Error)
/* IDK if there is a better way to do this… lol */
if ok && e.Error() == "no such table: migration" {
migratedp = false
} else {
return err
}
} else {
defer rows.Close()
}
if migratedp {
rows.Next()
if err := rows.Err(); err != nil {
return err
}
if err := rows.Scan(&latest); err != nil {
return err
}
} else {
latest = -1
}
files, err := fs.ReadDir(dir, ".")
if err != nil {
return err
}
var (
last string
scripts []string
)
for _, f := range files {
if n := f.Name(); n == "last.sql" {
last = n
} else {
scripts = append(scripts, f.Name())
}
}
sort.Strings(scripts)
for _, f := range scripts[latest+1:] {
qry, err := fs.ReadFile(dir, f)
if err != nil {
return err
}
tx, err := db.Begin()
if err != nil {
return err
}
if _, err := tx.Exec(string(qry)); err != nil {
tx.Rollback()
return fmt.Errorf("error in ‘%s’: %w", f, err)
}
var n int
if _, err := fmt.Sscanf(f, "%d", &n); err != nil {
return err
}
_, err = tx.Exec("UPDATE migration SET latest = ? WHERE id = 1", n)
if err != nil {
return err
}
if err := tx.Commit(); err != nil {
return err
}
log.Printf("Applied database migration ‘%s’\n", f)
}
if last != "" {
qry, err := fs.ReadFile(dir, last)
if err != nil {
return err
}
if _, err := db.Exec(string(qry)); err != nil {
return fmt.Errorf("error in ‘%s’: %w", last, err)
}
log.Printf("Ran ‘%s’\n", last)
}
return nil
}
func scanToStruct[T any](rs *sql.Rows) (T, error) {
return scanToStruct2[T](rs, true)
}
func scanToStructs[T any](rs *sql.Rows) ([]T, error) {
xs := []T{}
for rs.Next() {
x, err := scanToStruct2[T](rs, false)
if err != nil {
return nil, err
}
xs = append(xs, x)
}
return xs, rs.Err()
}
func scanToStruct2[T any](rs *sql.Rows, callNextP bool) (T, error) {
var t, zero T
cols, err := rs.Columns()
if err != nil {
return zero, err
}
v := reflect.ValueOf(&t).Elem()
tType := v.Type()
rawValues := make([]any, len(cols))
for i := range rawValues {
var zero any
rawValues[i] = &zero
}
if callNextP {
rs.Next()
if err := rs.Err(); err != nil {
return zero, err
}
}
if err := rs.Scan(rawValues...); err != nil {
return zero, err
}
/* col idx → [field idx, array idx] */
arrayTargets := make(map[int][2]int)
colToField := make(map[string]int)
for i := 0; i < tType.NumField(); i++ {
field := tType.Field(i)
tag := field.Tag.Get("db")
if tag == "" {
continue
}
if strings.Contains(tag, ";") {
dbcols := strings.Split(tag, ";")
fv := v.Field(i)
if fv.Kind() != reflect.Array {
return zero, fmt.Errorf("field ‘%s’ is not array",
field.Name)
}
if len(dbcols) != fv.Len() {
return zero, fmt.Errorf("field ‘%s’ array length mismatch",
field.Name)
}
for j, colName := range cols {
for k, dbColName := range dbcols {
if colName == dbColName {
arrayTargets[j] = [2]int{i, k}
}
}
}
} else {
colToField[tag] = i
}
}
for i, col := range cols {
vp := rawValues[i].(*any)
if fieldIdx, ok := colToField[col]; ok {
assignValue(v.Field(fieldIdx), *vp)
} else if target, ok := arrayTargets[i]; ok {
assignValue(v.Field(target[0]).Index(target[1]), *vp)
}
}
return t, nil
}
func assignValue(fv reflect.Value, val any) {
if val == nil {
fv.Set(reflect.Zero(fv.Type()))
return
}
v := reflect.ValueOf(val)
if v.Type().ConvertibleTo(fv.Type()) {
fv.Set(v.Convert(fv.Type()))
}
}
|
