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package core
import (
"context"
"encoding/json"
"fmt"
)
type StateBackend interface {
// For Framework ===
// SetCurrentKey will perform in Memory
SetCurrentKey(key string) error
// GetCurrentKey will perform in Memory
GetCurrentKey() string
SetCurrentNamespace(namespace any) error
GetCurrentNamespace() any
Snapshot(checkpointID uint64, targetDir string) error
// For User ===
// GetValueState will perform in disk
GetValueState(ctx context.Context, statename string) (ValueState[any], error)
}
type stateBackendKeyType struct{}
var stateBackendKey stateBackendKeyType
// type adapter
type typedValueState[T any] struct {
inner ValueState[any]
}
func CastValueType[T any](inner ValueState[any]) ValueState[T] {
return &typedValueState[T]{inner: inner}
}
func (s *typedValueState[T]) Value(ctx context.Context) (T, error) {
val, err := s.inner.Value(ctx)
var zero T
if err != nil {
return zero, err
}
if val == nil {
return zero, nil
}
if rawBytes, ok := val.([]byte); ok {
defer PutBuffer(rawBytes)
var result T
if err := json.Unmarshal(rawBytes, &result); err != nil {
return zero, fmt.Errorf("failed to unmarshal state: %w", err)
}
return result, nil
}
return val.(T), nil
}
func (s *typedValueState[T]) Update(ctx context.Context, newVal T) (T, error) {
_, err := s.inner.Update(ctx, newVal)
return newVal, err
}
func (s *typedValueState[T]) Clear(ctx context.Context) error {
return s.inner.Clear(ctx)
}
func InjectStateBackend(ctx context.Context, state StateBackend) context.Context {
return context.WithValue(ctx, stateBackendKey, state)
}
func ExtractStateBackend(ctx context.Context) (StateBackend, bool) {
backend, ok := ctx.Value(stateBackendKey).(StateBackend)
return backend, ok
}
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