added error and not-implemented pages and placeholder ad graphic

ui/render_wrap.go

@@ -16,6 +16,39 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
+func sendPageData(ctxt echo.Context, amctxt AmContext, command string, data any) error {
+	var err error
+	switch command {
+	case "bytes":
+		err = ctxt.Blob(amctxt.RC(), amctxt.OutputType(), data.([]byte))
+	case "string":
+		err = ctxt.String(amctxt.RC(), fmt.Sprintf("%v", data))
+	case "template":
+		err = amctxt.Render(fmt.Sprintf("%v", data))
+	case "framed_template":
+		amctxt.VarMap().Set("amsterdam_innerPage", data)
+		err = amctxt.Render("frame.jet")
+	default:
+		err = fmt.Errorf("unknown rendering type: %s", command)
+	}
+	return err
+}
+
+/* ErrorPage renders the Amsterdam page with a server error message.
+ * Parameters:
+ *     ctxt - The AmContext for the request.
+ *     input_err - The error to be rendered on the page.
+ * Returns:
+ *     Command string dictating what to be rendered.
+ *     Data as a parameter for the command string.
+ *     Standard Go error status.
+ */
+func ErrorPage(ctxt AmContext, input_err error) (string, any, error) {
+	ctxt.VarMap().Set("amsterdam_pageTitle", "Internal Server Error")
+	ctxt.VarMap().Set("error", input_err.Error())
+	return "framed_template", "error.jet", nil
+}
+
 /* AmWrap wraps the Amsterdam handler function in a wrapper that implements the spec for
  * Echo handler functions.
  * Parameters:
@@ -36,24 +69,15 @@ func AmWrap(myfunc func(AmContext) (string, any, error)) echo.HandlerFunc {
 				ctxt.Logger().Errorf("Session save error: %v", err)
 				return err
 			}
-			switch what {
-			case "bytes":
-				err = ctxt.Blob(amctxt.RC(), amctxt.OutputType(), rc.([]byte))
-			case "string":
-				err = ctxt.String(amctxt.RC(), fmt.Sprintf("%v", rc))
-			case "template":
-				err = amctxt.Render(fmt.Sprintf("%v", rc))
-			case "framed_template":
-				amctxt.VarMap().Set("amsterdam_innerPage", rc)
-				err = amctxt.Render("frame.jet")
-			default:
-				err = fmt.Errorf("unknown rendering type: %s", what)
-			}
+			err = sendPageData(ctxt, amctxt, what, rc)
 			if err != nil {
 				ctxt.Logger().Errorf("Rendering error: %v", err)
 			}
 		} else {
 			ctxt.Logger().Errorf("Page function error: %v", err)
+			_, rc, _ = ErrorPage(amctxt, err)
+			newerr := sendPageData(ctxt, amctxt, "framed_template", rc)
+			err = newerr
 		}
 		return err
 	}