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keys.go
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keys.go
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//nolint:revive
package model
import (
"database/sql"
"database/sql/driver"
"fmt"
"reflect"
"regexp"
"strings"
"github.com/google/uuid"
"github.com/oklog/ulid/v2"
)
func NewRunnerKey() RunnerKey { return RunnerKey(ulid.Make()) }
func ParseRunnerKey(key string) (RunnerKey, error) { return parseKey[RunnerKey](key) }
type runnerKey struct{}
type RunnerKey = keyType[runnerKey]
func NewControllerKey() ControllerKey { return ControllerKey(ulid.Make()) }
func ParseControllerKey(key string) (ControllerKey, error) { return parseKey[ControllerKey](key) }
type controllerKey struct{}
type ControllerKey = keyType[controllerKey]
var uuidRe = regexp.MustCompile(`^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$`)
func parseKey[KT keyType[U], U any](key string) (KT, error) {
var zero KT
kind := kindFromType[U]()
switch {
case strings.HasPrefix(key, kind):
ulid, err := ulid.Parse(key[len(kind):])
if err != nil {
return zero, fmt.Errorf("%s: %w", "invalid ULID key", err)
}
return KT(ulid), nil
case uuidRe.MatchString(key):
uuid, err := uuid.Parse(key)
if err != nil {
return zero, fmt.Errorf("%s: %w", "invalid UUID key", err)
}
return KT(uuid), nil
default:
return zero, fmt.Errorf("invalid %s key %q", kind, key)
}
}
// Helper type to avoid having to write a bunch of boilerplate. It relies on T being a
// named struct in the form <name>Key, eg. "runnerKey"
type keyType[T any] ulid.ULID
func (d keyType[T]) Value() (driver.Value, error) {
return uuid.UUID(d), nil
}
var _ sql.Scanner = (*keyType[int])(nil)
var _ driver.Valuer = (*keyType[int])(nil)
// Scan from UUID DB representation.
func (d *keyType[T]) Scan(src any) error {
input, ok := src.(string)
if !ok {
return fmt.Errorf("expected UUID to be a string but it's a %T", src)
}
id, err := uuid.Parse(input)
if err != nil {
return fmt.Errorf("%s: %w", "invalid UUID", err)
}
*d = keyType[T](id)
return nil
}
func (d keyType[T]) Kind() string { return kindFromType[T]() }
func (d keyType[T]) String() string { return d.Kind() + ulid.ULID(d).String() }
func (d keyType[T]) ULID() ulid.ULID { return ulid.ULID(d) }
func (d keyType[T]) MarshalText() ([]byte, error) { return []byte(d.String()), nil }
func (d *keyType[T]) UnmarshalText(bytes []byte) error {
id, err := parseKey[keyType[T]](string(bytes))
if err != nil {
return err
}
*d = id
return nil
}
func kindFromType[T any]() string {
var zero T
return strings.ToUpper(strings.TrimSuffix(reflect.TypeOf(zero).Name(), "Key")[:1])
}