feat: initial commit

internal/core/workflow/workflow.go

@@ -0,0 +1,46 @@
+package workflow
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+)
+
+type Workflow struct {
+	steps []Step
+}
+
+func (w *Workflow) Execute(ctx context.Context) error {
+	for idx, step := range w.steps {
+		if executionErr := step.Execute(ctx); executionErr != nil {
+			if compensationErrs := w.compensate(ctx, idx-1); compensationErrs != nil {
+				return errors.WithStack(NewCompensationError(executionErr, compensationErrs...))
+			}
+
+			return errors.WithStack(executionErr)
+		}
+	}
+
+	return nil
+}
+
+func (w *Workflow) compensate(ctx context.Context, fromIndex int) []error {
+	errs := make([]error, 0)
+	for idx := fromIndex; idx >= 0; idx -= 1 {
+		act := w.steps[idx]
+
+		if err := act.Compensate(ctx); err != nil {
+			errs = append(errs, errors.WithStack(err))
+		}
+	}
+
+	if len(errs) > 0 {
+		return errs
+	}
+
+	return nil
+}
+
+func New(steps ...Step) *Workflow {
+	return &Workflow{steps: steps}
+}