/api/v2 part 4 (#14706)

* expose the order of group by

* key renames in json wrapper v2

* added group by context and group by units

* added view_average_values

* fix for view_average_values when percentage is specified

* option group-by-labels is enabling the exposure of all the labels that are used for each of the final grouped dimensions

* when executing group by queries, allocate one dimension data at a time - not all of them

* respect hidden dimensions

* cancel running data query on socket error

* use poll to detect socket errors

* use POLLRDHUP to detect half closed connections

* make sure POLLRDHUP is available

* do not destroy aral-by-size arals

* completed documentation of /api/v2/data.

* moved min, max back to view; updated swagger yaml and json

* default format for /api/v2/data is json2

1 files changed, 5 insertions, 0 deletions

diff --git a/database/contexts/rrdcontext.h b/database/contexts/rrdcontext.h
index 0261c78227..152422aa79 100644
--- a/database/contexts/rrdcontext.h
+++ b/database/contexts/rrdcontext.h
@@ -258,6 +258,8 @@ typedef struct query_metric {
 
 #define MAX_QUERY_TARGET_ID_LENGTH 255
 
+typedef bool (*interrupt_callback_t)(void *data);
+
 typedef struct query_target_request {
     size_t version;
 
@@ -303,6 +305,9 @@ typedef struct query_target_request {
     RRDR_GROUP_BY_FUNCTION group_by_aggregate_function;
 
     usec_t received_ut;
+
+    interrupt_callback_t interrupt_callback;
+    void *interrupt_callback_data;
 } QUERY_TARGET_REQUEST;
 
 #define GROUP_BY_MAX_LABEL_KEYS 10