multiline: add json multiline builtin parser

Signed-off-by: lecaros <lecaros@chronosphere.io>

Author: lecaros

include/fluent-bit/multiline/flb_ml_parser.h

@@ -89,5 +89,6 @@ struct flb_ml_parser *flb_ml_parser_java(struct flb_config *config, char *key);
 struct flb_ml_parser *flb_ml_parser_go(struct flb_config *config, char *key);
 struct flb_ml_parser *flb_ml_parser_ruby(struct flb_config *config, char *key);
 struct flb_ml_parser *flb_ml_parser_python(struct flb_config *config, char *key);
+struct flb_ml_parser *flb_ml_parser_json(struct flb_config *config, char *key);
 
 #endif

plugins/filter_multiline/ml.c

@@ -1023,7 +1023,7 @@ static struct flb_config_map config_map[] = {
     {
      FLB_CONFIG_MAP_CLIST, "multiline.parser", NULL,
      FLB_CONFIG_MAP_MULT, FLB_TRUE, offsetof(struct ml_ctx, multiline_parsers),
-     "specify one or multiple multiline parsers: docker, cri, go, java, etc."
+     "specify one or multiple multiline parsers: docker, cri, go, java, json, etc."
     },
 
     {

plugins/in_tail/tail.c

@@ -826,7 +826,7 @@ static struct flb_config_map config_map[] = {
     {
      FLB_CONFIG_MAP_CLIST, "multiline.parser", NULL,
      FLB_CONFIG_MAP_MULT, FLB_TRUE, offsetof(struct flb_tail_config, multiline_parsers),
-     "specify one or multiple multiline parsers: docker, cri, go, java, etc."
+     "specify one or multiple multiline parsers: docker, cri, go, java, json, etc."
     },
 #endif
 

src/multiline/CMakeLists.txt

@@ -6,6 +6,7 @@ set(src_multiline
   multiline/flb_ml_parser_java.c
   multiline/flb_ml_parser_go.c
   multiline/flb_ml_parser_ruby.c
+  multiline/flb_ml_parser_json.c
   # core
   multiline/flb_ml_stream.c
   multiline/flb_ml_parser.c

src/multiline/flb_ml_parser.c

@@ -188,6 +188,13 @@ int flb_ml_parser_builtin_create(struct flb_config *config)
         goto error;
     }
 
+    /* JSON */
+    mlp = flb_ml_parser_json(config, NULL);
+    if (!mlp) {
+        flb_error("[multiline] could not init 'json' built-in parser");
+        goto error;
+    }
+
     ret = 0;
     return ret;