handling context timeout/cancelled in printer package

internal/app/api/pkg/context/context.go

@@ -1,6 +1,7 @@
 package context
 
 import (
+	"fmt"
 	"net/http"
 	"strconv"
 	"time"
@@ -35,9 +36,10 @@ func New(c echo.Context, logger *logger.Logger, config *config.Config) *Context
 // MustCastFromEchoContext cast an echo.Context to our custom
 // context. If something goes wrong, panic.
 func MustCastFromEchoContext(c echo.Context) *Context {
+	const op = "MustCastFromEchoContext"
 	ctx, ok := c.(*Context)
 	if !ok {
-		panic("unable to cast an echo.Context to a custom context")
+		panic(fmt.Sprintf("%s: unable to cast an echo.Context to a custom context", op))
 	}
 	return ctx
 }