Merge pull request #1998 from ktsaou/master

[netdata.git] / src / registry.h

diff --git a/src/registry.h b/src/registry.h
index 03ffbb31b24e48e11406a59d1fa9416a51591f8c..2c4592b922e20e5abe8423fa06abdde14489ab0f 100644 (file)
--- a/src/registry.h
+++ b/src/registry.h
@@ -1,22 +1,75 @@
-#include "web_client.h"
+/*
+ * netdata registry
+ *
+ * this header file describes the public interface
+ * to the netdata registry
+ *
+ * only these high level functions are exposed
+ *
+ */
+
+// ----------------------------------------------------------------------------
+// TODO
+//
+// 1. the default tracking cookie expires in 1 year, but the persons are not
+//    removed from the db - this means the database only grows - ideally the
+//    database should be cleaned in registry_db_save() for both on-disk and
+//    on-memory entries.
+//
+//    Cleanup:
+//    i. Find all the PERSONs that have expired cookie
+//    ii. For each of their PERSON_URLs:
+//     - decrement the linked MACHINE links
+//     - if the linked MACHINE has no other links, remove the linked MACHINE too
+//     - remove the PERSON_URL
+//
+// 2. add protection to prevent abusing the registry by flooding it with
+//    requests to fill the memory and crash it.
+//
+//    Possible protections:
+//    - limit the number of URLs per person
+//    - limit the number of URLs per machine
+//    - limit the number of persons
+//    - limit the number of machines
+//    - [DONE] limit the size of URLs
+//    - [DONE] limit the size of PERSON_URL names
+//    - limit the number of requests that add data to the registry,
+//      per client IP per hour
+//
+// 3. lower memory requirements
+//
+//    - embed avl structures directly into registry objects, instead of DICTIONARY
+//      [DONE for PERSON_URLs, PENDING for MACHINE_URLs]
+//    - store GUIDs in memory as UUID instead of char *
+//    - do not track persons using the demo machines only
+//      (i.e. start tracking them only when they access a non-demo machine)
+//    - [DONE] do not track custom dashboards by default
+
 
 #ifndef NETDATA_REGISTRY_H
 #define NETDATA_REGISTRY_H 1
 
 #define NETDATA_REGISTRY_COOKIE_NAME "netdata_registry_id"
 
-extern int registry_request_access_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *name, time_t when);
-extern int registry_request_delete_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when);
-extern int registry_request_search_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when);
-extern int registry_request_hello_json(struct web_client *w);
-
+// initialize the registry
+// should only happen when netdata starts
 extern int registry_init(void);
+
+// free all data held by the registry
+// should only happen when netdata exits
 extern void registry_free(void);
-extern int registry_save(void);
 
-extern char *registry_get_this_machine_guid(void);
+// HTTP requests handled by the registry
+extern int registry_request_access_json(RRDHOST *host, struct web_client *w, char *person_guid, char *machine_guid, char *url, char *name, time_t when);
+extern int registry_request_delete_json(RRDHOST *host, struct web_client *w, char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when);
+extern int registry_request_search_json(RRDHOST *host, struct web_client *w, char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when);
+extern int registry_request_switch_json(RRDHOST *host, struct web_client *w, char *person_guid, char *machine_guid, char *url, char *new_person_guid, time_t when);
+extern int registry_request_hello_json(RRDHOST *host, struct web_client *w);
 
+// update the registry monitoring charts
 extern void registry_statistics(void);
 
+extern char *registry_get_this_machine_guid(void);
+extern int regenerate_guid(const char *guid, char *result);
 
 #endif /* NETDATA_REGISTRY_H */