feat: initial commit

internal/core/workflow/step.go

@@ -0,0 +1,40 @@
+package workflow
+
+import "context"
+
+type Step interface {
+	Execute(ctx context.Context) error
+	Compensate(ctx context.Context) error
+}
+
+type step struct {
+	execute    func(ctx context.Context) error
+	compensate func(ctx context.Context) error
+}
+
+// Compensate implements Step.
+func (s *step) Compensate(ctx context.Context) error {
+	if s.compensate == nil {
+		return nil
+	}
+
+	return s.compensate(ctx)
+}
+
+// Execute implements Step.
+func (s *step) Execute(ctx context.Context) error {
+	if s.execute == nil {
+		return nil
+	}
+
+	return s.execute(ctx)
+}
+
+var _ Step = &step{}
+
+func StepFunc(execute func(ctx context.Context) error, compensate func(ctx context.Context) error) Step {
+	return &step{
+		execute:    execute,
+		compensate: compensate,
+	}
+}