Add support for optional JSON fieldsHEADommongodb

These fields are only relevant in field templates (i.e. mongodb): a
field for a non-existent CEE property is not created (instead of being
set to an empty string).

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/template.c b/template.c
index d9ca0710..298f813c 100644
--- a/template.c
+++ b/template.c
@@ -669,6 +669,8 @@ static void doOptions(unsigned char **pp, struct templateEntry *pTpe)
 			} else {
 				pTpe->data.field.options.bJSONf = 1;
 			}
+		 } else if(!strcmp((char*)Buf, "optional-field")) {
+			 pTpe->data.field.options.bOptionalField = 1;
 		 } else {
 			dbgprintf("Invalid field option '%s' specified - ignored.\n", Buf);
 		 }
@@ -1984,6 +1986,9 @@ void tplPrintList(rsconf_t *conf)
 				if(pTpe->data.field.options.bJSONf) {
 					dbgprintf("[format as JSON field] ");
 				}
+				if(pTpe->data.field.options.bOptionalField) {
+					dbgprintf("[optional field - skip in field template if not present] ");
+				}
 				if(pTpe->data.field.options.bDropLastLF) {
 				  	dbgprintf("[drop last LF in msg] ");
 				}