router: add router context structure and move routing state

Replace config routing mask fields with router context pointer.
Add router struct with mask state and metrics counters.

Signed-off-by: Eduardo Silva <eduardo@chronosphere.io>

Author: edsiper

include/fluent-bit/flb_router.h

@@ -28,6 +28,8 @@
 #include <fluent-bit/flb_config.h>
 #include <fluent-bit/flb_conditionals.h>
 #include <cfl/cfl.h>
+#include <cmetrics/cmetrics.h>
+#include <cmetrics/cmt_counter.h>
 #include <monkey/mk_core.h>
 
 struct flb_mp_chunk_cobj;
@@ -47,6 +49,22 @@ struct flb_router_path {
     struct cfl_list _head;
 };
 
+struct flb_router {
+    /* Routing masks */
+    size_t route_mask_size;
+    size_t route_mask_slots;
+    uint64_t *route_empty_mask;
+
+    /* metrics context */
+    struct cmt *cmt;
+
+    /* logs routing metrics */
+    struct cmt_counter *logs_records_total;
+    struct cmt_counter *logs_bytes_total;
+    struct cmt_counter *logs_drop_records_total;
+    struct cmt_counter *logs_drop_bytes_total;
+};
+
 static inline int flb_router_match_type(int in_event_type,
                                         struct flb_output_instance *o_ins)
 {
@@ -183,5 +201,9 @@ int flb_router_config_parse(struct flb_cf *cf,
 void flb_router_routes_destroy(struct cfl_list *input_routes);
 int flb_router_apply_config(struct flb_config *config);
 
+int flb_router_metrics_create(struct flb_config *config, struct flb_router *router);
+struct flb_router *flb_router_create(struct flb_config *config);
+void flb_router_destroy(struct flb_router *router);
+
 #endif