Virtual hosts for data collection (#14464)

* support multiple hosts at pluginsd structures

* cleanup obsolete code

* use a lookup hashtable to quickly find the keyword to execute, without traversing the whole linked list of keywords

* more cleanup

* move new hash function to inlined.h

* minimize comparisons, eliminate a pre-parsing of the first keyword for each line

* cleanup parser from old code

* move parser into libnetdata

* unique entries in parser keywords hashtable

* move all hashing functions to inlined.h, name their sources, simple_hash() now defaults to FNV1a, it was FNV1

* small_hash() for parser

* plugins.d now can switch hosts, and also create/update them

* update hash function and hashtable size

* updated message

* unittest all hashing functions

* reset the chart when setting a new host

* remove host tags

* enable archived hosts when a collector pushes host info

* do not need localhost to swtich to localhost

* disable ARAL and OWA with -DFSANITIZE_ADDRESS=1

4 files changed, 34 insertions, 7 deletions

diff --git a/database/rrd.h b/database/rrd.h
index 60be22a677..d138442124 100644
--- a/database/rrd.h
+++ b/database/rrd.h
@@ -279,7 +279,7 @@ void rrdlabels_destroy(DICTIONARY *labels_dict);
 void rrdlabels_add(DICTIONARY *dict, const char *name, const char *value, RRDLABEL_SRC ls);
 void rrdlabels_add_pair(DICTIONARY *dict, const char *string, RRDLABEL_SRC ls);
 void rrdlabels_get_value_to_buffer_or_null(DICTIONARY *labels, BUFFER *wb, const char *key, const char *quote, const char *null);
-void rrdlabels_get_value_to_char_or_null(DICTIONARY *labels, char **value, const char *key);
+void rrdlabels_get_value_strdup_or_null(DICTIONARY *labels, char **value, const char *key);
 void rrdlabels_flush(DICTIONARY *labels_dict);
 
 void rrdlabels_unmark_all(DICTIONARY *labels);
@@ -961,6 +961,8 @@ struct rrdhost_system_info {
     int mc_version;
 };
 
+struct rrdhost_system_info *rrdhost_labels_to_system_info(DICTIONARY *labels);
+
 struct rrdhost {
     char machine_guid[GUID_LEN + 1];                // the unique ID of this host
 
diff --git a/database/rrdcalc.c b/database/rrdcalc.c
index 1bfd502848..e25a22805a 100644
--- a/database/rrdcalc.c
+++ b/database/rrdcalc.c
@@ -100,7 +100,7 @@ static STRING *rrdcalc_replace_variables_with_rrdset_labels(const char *line, RR
             label_val[i - RRDCALC_VAR_LABEL_LEN - 1] = '\0';
 
             if(likely(rc->rrdset && rc->rrdset->rrdlabels)) {
-                rrdlabels_get_value_to_char_or_null(rc->rrdset->rrdlabels, &lbl_value, label_val);
+                rrdlabels_get_value_strdup_or_null(rc->rrdset->rrdlabels, &lbl_value, label_val);
                 if (lbl_value) {
                     char *buf = find_and_replace(temp, var, lbl_value, m);
                     freez(temp);
diff --git a/database/rrdhost.c b/database/rrdhost.c
index f9a657a248..ee7503c4fc 100644
--- a/database/rrdhost.c
+++ b/database/rrdhost.c
@@ -1279,6 +1279,33 @@ void rrdhost_save_charts(RRDHOST *host) {
     rrdset_foreach_done(st);
 }
 
+struct rrdhost_system_info *rrdhost_labels_to_system_info(DICTIONARY *labels) {
+    struct rrdhost_system_info *info = callocz(1, sizeof(struct rrdhost_system_info));
+    info->hops = 1;
+
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->cloud_provider_type, "_cloud_provider_type");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->cloud_instance_type, "_cloud_instance_type");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->cloud_instance_region, "_cloud_instance_region");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_os_name, "_os_name");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_os_version, "_os_version");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->kernel_version, "_kernel_version");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_cores, "_system_cores");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_cpu_freq, "_system_cpu_freq");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_ram_total, "_system_ram_total");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->host_disk_space, "_system_disk_space");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->architecture, "_architecture");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->virtualization, "_virtualization");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->container, "_container");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->container_detection, "_container_detection");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->virt_detection, "_virt_detection");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->is_k8s_node, "_is_k8s_node");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->install_type, "_install_type");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->prebuilt_arch, "_prebuilt_arch");
+    rrdlabels_get_value_strdup_or_null(labels, &localhost->system_info->prebuilt_dist, "_prebuilt_dist");
+
+    return info;
+}
+
 static void rrdhost_load_auto_labels(void) {
     DICTIONARY *labels = localhost->rrdlabels;
 
@@ -1289,8 +1316,7 @@ static void rrdhost_load_auto_labels(void) {
         rrdlabels_add(labels, "_cloud_instance_type", localhost->system_info->cloud_instance_type, RRDLABEL_SRC_AUTO);
 
     if (localhost->system_info->cloud_instance_region)
-        rrdlabels_add(
-            labels, "_cloud_instance_region", localhost->system_info->cloud_instance_region, RRDLABEL_SRC_AUTO);
+        rrdlabels_add(labels, "_cloud_instance_region", localhost->system_info->cloud_instance_region, RRDLABEL_SRC_AUTO);
 
     if (localhost->system_info->host_os_name)
         rrdlabels_add(labels, "_os_name", localhost->system_info->host_os_name, RRDLABEL_SRC_AUTO);
@@ -1354,8 +1380,7 @@ void rrdhost_set_is_parent_label(int count) {
     DICTIONARY *labels = localhost->rrdlabels;
 
     if (count == 0 || count == 1) {
-        rrdlabels_add(
-                      labels, "_is_parent", (count) ? "true" : "false", RRDLABEL_SRC_AUTO);
+        rrdlabels_add(labels, "_is_parent", (count) ? "true" : "false", RRDLABEL_SRC_AUTO);
 
         //queue a node info
 #ifdef ENABLE_ACLK
diff --git a/database/rrdlabels.c b/database/rrdlabels.c
index 4a9a6dae6a..38ca9e6159 100644
--- a/database/rrdlabels.c
+++ b/database/rrdlabels.c
@@ -654,7 +654,7 @@ void rrdlabels_get_value_to_buffer_or_null(DICTIONARY *labels, BUFFER *wb, const
 // ----------------------------------------------------------------------------
 // rrdlabels_get_value_to_char_or_null()
 
-void rrdlabels_get_value_to_char_or_null(DICTIONARY *labels, char **value, const char *key) {
+void rrdlabels_get_value_strdup_or_null(DICTIONARY *labels, char **value, const char *key) {
     const DICTIONARY_ITEM *acquired_item = dictionary_get_and_acquire_item(labels, key);
     RRDLABEL *lb = dictionary_acquired_item_value(acquired_item);