feat: initial commit

internal/core/workflow/error.go

@@ -0,0 +1,50 @@
+package workflow
+
+import (
+	"strconv"
+	"strings"
+)
+
+type CompensationError struct {
+	executionErr     error
+	compensationErrs []error
+}
+
+func (e *CompensationError) ExecutionError() error {
+	return e.executionErr
+}
+
+func (e *CompensationError) CompensationErrors() []error {
+	return e.compensationErrs
+}
+
+func (e *CompensationError) Error() string {
+	var sb strings.Builder
+
+	sb.WriteString("compensation error: ")
+	sb.WriteString("execution error '")
+	sb.WriteString(e.ExecutionError().Error())
+	sb.WriteString("' resulted in following compensation errors: ")
+
+	for idx, err := range e.CompensationErrors() {
+		if idx > 0 {
+			sb.WriteString(", ")
+		}
+
+		sb.WriteString("[")
+		sb.WriteString(strconv.FormatInt(int64(idx), 10))
+		sb.WriteString("] ")
+		sb.WriteString(err.Error())
+	}
+
+	return sb.String()
+}
+
+func NewCompensationError(executionErr error, compensationErrs ...error) *CompensationError {
+	return &CompensationError{
+		executionErr:     executionErr,
+		compensationErrs: compensationErrs,
+	}
+}
+
+var _ error = &CompensationError{}