1 files changed, 126 insertions, 0 deletions
diff --git a/database/contexts/query_scope.c b/database/contexts/query_scope.c
new file mode 100644
index 000000000..f3bcd0b3f
--- /dev/null
+++ b/database/contexts/query_scope.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "internal.h"
+
+ssize_t query_scope_foreach_host(SIMPLE_PATTERN *scope_hosts_sp, SIMPLE_PATTERN *hosts_sp,
+                                  foreach_host_cb_t cb, void *data,
+                                  struct query_versions *versions,
+                                  char *host_node_id_str) {
+    char uuid[UUID_STR_LEN];
+    if(!host_node_id_str) host_node_id_str = uuid;
+    host_node_id_str[0] = '\0';
+
+    RRDHOST *host;
+    ssize_t added = 0;
+    uint64_t v_hash = 0;
+    uint64_t h_hash = 0;
+    uint64_t a_hash = 0;
+    uint64_t t_hash = 0;
+
+    dfe_start_read(rrdhost_root_index, host) {
+        if(host->node_id)
+            uuid_unparse_lower(*host->node_id, host_node_id_str);
+        else
+            host_node_id_str[0] = '\0';
+
+        SIMPLE_PATTERN_RESULT match = SP_MATCHED_POSITIVE;
+        if(scope_hosts_sp) {
+            match = simple_pattern_matches_string_extract(scope_hosts_sp, host->hostname, NULL, 0);
+            if(match == SP_NOT_MATCHED) {
+                match = simple_pattern_matches_extract(scope_hosts_sp, host->machine_guid, NULL, 0);
+                if(match == SP_NOT_MATCHED && *host_node_id_str)
+                    match = simple_pattern_matches_extract(scope_hosts_sp, host_node_id_str, NULL, 0);
+            }
+        }
+
+        if(match != SP_MATCHED_POSITIVE)
+            continue;
+
+        dfe_unlock(host);
+
+        if(hosts_sp) {
+            match = simple_pattern_matches_string_extract(hosts_sp, host->hostname, NULL, 0);
+            if(match == SP_NOT_MATCHED) {
+                match = simple_pattern_matches_extract(hosts_sp, host->machine_guid, NULL, 0);
+                if(match == SP_NOT_MATCHED && *host_node_id_str)
+                    match = simple_pattern_matches_extract(hosts_sp, host_node_id_str, NULL, 0);
+            }
+        }
+
+        bool queryable_host = (match == SP_MATCHED_POSITIVE);
+
+        v_hash += dictionary_version(host->rrdctx.contexts);
+        h_hash += dictionary_version(host->rrdctx.hub_queue);
+        a_hash += dictionary_version(host->rrdcalc_root_index);
+        t_hash += __atomic_load_n(&host->health_transitions, __ATOMIC_RELAXED);
+        ssize_t ret = cb(data, host, queryable_host);
+        if(ret < 0) {
+            added = ret;
+            break;
+        }
+        added += ret;
+    }
+    dfe_done(host);
+
+    if(versions) {
+        versions->contexts_hard_hash = v_hash;
+        versions->contexts_soft_hash = h_hash;
+        versions->alerts_hard_hash = a_hash;
+        versions->alerts_soft_hash = t_hash;
+    }
+
+    return added;
+}
+
+ssize_t query_scope_foreach_context(RRDHOST *host, const char *scope_contexts, SIMPLE_PATTERN *scope_contexts_sp,
+                                   SIMPLE_PATTERN *contexts_sp, foreach_context_cb_t cb, bool queryable_host, void *data) {
+    if(unlikely(!host->rrdctx.contexts))
+        return 0;
+
+    ssize_t added = 0;
+
+    RRDCONTEXT_ACQUIRED *rca = NULL;
+
+    if(scope_contexts)
+        rca = (RRDCONTEXT_ACQUIRED *)dictionary_get_and_acquire_item(host->rrdctx.contexts, scope_contexts);
+
+    if(likely(rca)) {
+        // we found it!
+
+        bool queryable_context = queryable_host;
+        RRDCONTEXT *rc = rrdcontext_acquired_value(rca);
+        if(queryable_context && contexts_sp && !simple_pattern_matches_string(contexts_sp, rc->id))
+            queryable_context = false;
+
+        added = cb(data, rca, queryable_context);
+
+        rrdcontext_release(rca);
+    }
+    else {
+        // Probably it is a pattern, we need to search for it...
+        RRDCONTEXT *rc;
+        dfe_start_read(host->rrdctx.contexts, rc) {
+            if(scope_contexts_sp && !simple_pattern_matches_string(scope_contexts_sp, rc->id))
+                continue;
+
+            dfe_unlock(rc);
+
+            bool queryable_context = queryable_host;
+            if(queryable_context && contexts_sp && !simple_pattern_matches_string(contexts_sp, rc->id))
+                queryable_context = false;
+
+            ssize_t ret = cb(data, (RRDCONTEXT_ACQUIRED *)rc_dfe.item, queryable_context);
+
+            if(ret < 0) {
+                added = ret;
+                break;
+            }
+
+            added += ret;
+        }
+        dfe_done(rc);
+    }
+
+    return added;
+}
+