modularized all source code (#4391)

* modularized all external plugins

* added README.md in plugins

* fixed title

* fixed typo

* relative link to external plugins

* external plugins configuration README

* added plugins link

* remove plugins link

* plugin names are links

* added links to external plugins

* removed unecessary spacing

* list to table

* added language

* fixed typo

* list to table on internal plugins

* added more documentation to internal plugins

* moved python, node, and bash code and configs into the external plugins

* added statsd README

* fix bug with corrupting config.h every 2nd compilation

* moved all config files together with their code

* more documentation

* diskspace info

* fixed broken links in apps.plugin

* added backends docs

* updated plugins readme

* move nc-backend.sh to backends

* created daemon directory

* moved all code outside src/

* fixed readme identation

* renamed plugins.d.plugin to plugins.d

* updated readme

* removed linux- from linux plugins

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* fixed README.md links

* fixed netdata tree links

* updated codacy, codeclimate and lgtm excluded paths

* update CMakeLists.txt

* updated automake options at top directory

* libnetdata slit into directories

* updated READMEs

* updated READMEs

* updated ARL docs

* updated ARL docs

* moved /plugins to /collectors

* moved all external plugins outside plugins.d

* updated codacy, codeclimate, lgtm

* updated README

* updated url

* updated readme

* updated readme

* updated readme

* updated readme

* moved api and web into webserver

* web/api web/gui web/server

* modularized webserver

* removed web/gui/version.txt

1 files changed, 88 insertions, 0 deletions

diff --git a/registry/registry_internals.h b/registry/registry_internals.h
new file mode 100644
index 0000000000..baa2dc09dd
--- /dev/null
+++ b/registry/registry_internals.h
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_REGISTRY_INTERNALS_H_H
+#define NETDATA_REGISTRY_INTERNALS_H_H 1
+
+#include "registry.h"
+
+#define REGISTRY_URL_FLAGS_DEFAULT 0x00
+#define REGISTRY_URL_FLAGS_EXPIRED 0x01
+
+#define DICTIONARY_FLAGS (DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE | DICTIONARY_FLAG_NAME_LINK_DONT_CLONE | DICTIONARY_FLAG_SINGLE_THREADED)
+
+// ----------------------------------------------------------------------------
+// COMMON structures
+
+struct registry {
+    int enabled;
+
+    // entries counters / statistics
+    unsigned long long persons_count;
+    unsigned long long machines_count;
+    unsigned long long usages_count;
+    unsigned long long urls_count;
+    unsigned long long persons_urls_count;
+    unsigned long long machines_urls_count;
+    unsigned long long log_count;
+
+    // memory counters / statistics
+    unsigned long long persons_memory;
+    unsigned long long machines_memory;
+    unsigned long long urls_memory;
+    unsigned long long persons_urls_memory;
+    unsigned long long machines_urls_memory;
+
+    // configuration
+    unsigned long long save_registry_every_entries;
+    char *registry_domain;
+    char *hostname;
+    char *registry_to_announce;
+    time_t persons_expiration; // seconds to expire idle persons
+    int verify_cookies_redirects;
+
+    size_t max_url_length;
+    size_t max_name_length;
+
+    // file/path names
+    char *pathname;
+    char *db_filename;
+    char *log_filename;
+    char *machine_guid_filename;
+
+    // open files
+    FILE *log_fp;
+
+    // the database
+    DICTIONARY *persons;    // dictionary of REGISTRY_PERSON *,  with key the REGISTRY_PERSON.guid
+    DICTIONARY *machines;   // dictionary of REGISTRY_MACHINE *, with key the REGISTRY_MACHINE.guid
+
+    avl_tree registry_urls_root_index;
+
+    netdata_mutex_t lock;
+};
+
+#include "registry_url.h"
+#include "registry_machine.h"
+#include "registry_person.h"
+#include "registry.h"
+
+extern struct registry registry;
+
+// REGISTRY LOW-LEVEL REQUESTS (in registry-internals.c)
+extern REGISTRY_PERSON *registry_request_access(char *person_guid, char *machine_guid, char *url, char *name, time_t when);
+extern REGISTRY_PERSON *registry_request_delete(char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when);
+extern REGISTRY_MACHINE *registry_request_machine(char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when);
+
+// REGISTRY LOG (in registry_log.c)
+extern void registry_log(char action, REGISTRY_PERSON *p, REGISTRY_MACHINE *m, REGISTRY_URL *u, char *name);
+extern int registry_log_open(void);
+extern void registry_log_close(void);
+extern void registry_log_recreate(void);
+extern ssize_t registry_log_load(void);
+
+// REGISTRY DB (in registry_db.c)
+extern int registry_db_save(void);
+extern size_t registry_db_load(void);
+extern int registry_db_should_be_saved(void);
+
+#endif //NETDATA_REGISTRY_INTERNALS_H_H