Added support for rounding of values by default in API responses

internal/adapters/inbound/httpapi/query_bind.go

@@ -14,6 +14,11 @@ type queryRequest struct {
 	Units presenter.Units
 }
 
+type precisionQueryRequest struct {
+	Units     presenter.Units
+	Precision int
+}
+
 func bindQuery(r *http.Request) (queryRequest, error) {
 	normalizeCommonQueryValue(r, "units")
 	normalizeCommonQueryValue(r, "format")
@@ -34,3 +39,36 @@ func bindQuery(r *http.Request) (queryRequest, error) {
 	}
 	return queryRequest{Units: units}, nil
 }
+
+func bindPrecisionQuery(r *http.Request) (precisionQueryRequest, error) {
+	normalizeCommonQueryValue(r, "units")
+	normalizeCommonQueryValue(r, "format")
+	normalizeCommonQueryValue(r, "precision")
+
+	common, err := bind.CommonQueryParams(r, bind.QueryPolicy{
+		AllowUnits:    true,
+		AllowFormat:   true,
+		DefaultUnits:  string(presenter.UnitsMetric),
+		RejectUnknown: true,
+	}, "precision")
+	if err != nil {
+		return precisionQueryRequest{}, err
+	}
+
+	precision, err := bind.OptionalInt(r, "precision", 0)
+	if err != nil {
+		return precisionQueryRequest{}, err
+	}
+	if err := bind.MinInt(precision, 0, "precision"); err != nil {
+		return precisionQueryRequest{}, err
+	}
+	if err := bind.MaxInt(precision, 2, "precision"); err != nil {
+		return precisionQueryRequest{}, err
+	}
+
+	units := presenter.Units(strings.ToLower(strings.TrimSpace(common.Units)))
+	if units == "" {
+		units = presenter.UnitsMetric
+	}
+	return precisionQueryRequest{Units: units, Precision: precision}, nil
+}