Implement netdata command server and cli tool (#7325)

* Checkpoint commit (POC)

* Implemented command server in the daemon

* Add netdatacli implementation

* Added prints in command server setup functions

* Make libuv version 1 a hard dependency for the agent

* Additional documentation

* Improved accuracy of names and documentation

* Fixed documentation

* Fixed buffer overflow

* Added support for exit status in cli. Added prefixes for exit code, stdout and stderr. Fixed parsers.

* Fix compilation errors

* Fix compile errors

* Fix compile errors

* Fix compile error

* Fix linker error for muslc

4 files changed, 4 insertions, 10 deletions

diff --git a/database/engine/rrdengine.c b/database/engine/rrdengine.c
index b6b6548ecf..9615665f85 100644
--- a/database/engine/rrdengine.c
+++ b/database/engine/rrdengine.c
@@ -8,7 +8,7 @@ rrdeng_stats_t global_fs_errors = 0;
 rrdeng_stats_t rrdeng_reserved_file_descriptors = 0;
 rrdeng_stats_t global_flushing_errors = 0;
 
-void sanity_check(void)
+static void sanity_check(void)
 {
     /* Magic numbers must fit in the super-blocks */
     BUILD_BUG_ON(strlen(RRDENG_DF_MAGIC) > RRDENG_MAGIC_SZ);
@@ -845,6 +845,7 @@ void rrdengine_main(void)
     int ret;
     struct rrdengine_instance *ctx;
 
+    sanity_check();
     ret = rrdeng_init(&ctx, "/tmp", RRDENG_MIN_PAGE_CACHE_SIZE_MB, RRDENG_MIN_DISK_SPACE_MB);
     if (ret) {
         exit(ret);
diff --git a/database/engine/rrdengine.h b/database/engine/rrdengine.h
index 78a35a0bfd..67f1b41c3d 100644
--- a/database/engine/rrdengine.h
+++ b/database/engine/rrdengine.h
@@ -7,14 +7,11 @@
 #define _GNU_SOURCE
 #endif
 #include <fcntl.h>
-#include <aio.h>
-#include <uv.h>
-#include <assert.h>
 #include <lz4.h>
 #include <Judy.h>
 #include <openssl/sha.h>
 #include <openssl/evp.h>
-#include <stdint.h>
+#include "../../daemon/common.h"
 #include "../rrd.h"
 #include "rrddiskprotocol.h"
 #include "rrdenginelib.h"
@@ -177,7 +174,6 @@ struct rrdengine_instance {
     struct rrdengine_statistics stats;
 };
 
-extern void sanity_check(void);
 extern int init_rrd_files(struct rrdengine_instance *ctx);
 extern void finalize_rrd_files(struct rrdengine_instance *ctx);
 extern void rrdeng_test_quota(struct rrdengine_worker_config* wc);
diff --git a/database/engine/rrdengineapi.c b/database/engine/rrdengineapi.c
index baf4a99733..0ae3d44d28 100644
--- a/database/engine/rrdengineapi.c
+++ b/database/engine/rrdengineapi.c
@@ -745,8 +745,6 @@ int rrdeng_init(struct rrdengine_instance **ctxp, char *dbfiles_path, unsigned p
     int error;
     uint32_t max_open_files;
 
-    sanity_check();
-
     max_open_files = rlimit_nofile.rlim_cur / 4;
 
     /* reserve RRDENG_FD_BUDGET_PER_INSTANCE file descriptors for this instance */
diff --git a/database/engine/rrdenginelib.h b/database/engine/rrdenginelib.h
index 5685b65a5c..295f7df056 100644
--- a/database/engine/rrdenginelib.h
+++ b/database/engine/rrdenginelib.h
@@ -3,10 +3,9 @@
 #ifndef NETDATA_RRDENGINELIB_H
 #define NETDATA_RRDENGINELIB_H
 
-#include "rrdengine.h"
-
 /* Forward declarations */
 struct rrdeng_page_descr;
+struct rrdengine_instance;
 
 #define STR_HELPER(x) #x
 #define STR(x) STR_HELPER(x)