1 files changed, 71 insertions, 0 deletions
diff --git a/src/web/api/queries/incremental_sum/incremental_sum.h b/src/web/api/queries/incremental_sum/incremental_sum.h
new file mode 100644
index 000000000..f110c5861
--- /dev/null
+++ b/src/web/api/queries/incremental_sum/incremental_sum.h
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_INCREMENTAL_SUM_H
+#define NETDATA_API_QUERY_INCREMENTAL_SUM_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+struct tg_incremental_sum {
+    NETDATA_DOUBLE first;
+    NETDATA_DOUBLE last;
+    size_t count;
+};
+
+// resets when switches dimensions
+// so, clear everything to restart
+static inline void tg_incremental_sum_reset(RRDR *r) {
+    struct tg_incremental_sum *g = (struct tg_incremental_sum *)r->time_grouping.data;
+    g->first = NAN;
+    g->last = NAN;
+    g->count = 0;
+}
+
+static inline void tg_incremental_sum_create(RRDR *r, const char *options __maybe_unused) {
+    r->time_grouping.data = onewayalloc_mallocz(r->internal.owa, sizeof(struct tg_incremental_sum));
+    tg_incremental_sum_reset(r);
+}
+
+static inline void tg_incremental_sum_free(RRDR *r) {
+    onewayalloc_freez(r->internal.owa, r->time_grouping.data);
+    r->time_grouping.data = NULL;
+}
+
+static inline void tg_incremental_sum_add(RRDR *r, NETDATA_DOUBLE value) {
+    struct tg_incremental_sum *g = (struct tg_incremental_sum *)r->time_grouping.data;
+
+    if(unlikely(!g->count)) {
+        if(isnan(g->first))
+            g->first = value;
+        else
+            g->last = value;
+
+        g->count++;
+    }
+    else {
+        g->last = value;
+        g->count++;
+    }
+}
+
+static inline NETDATA_DOUBLE tg_incremental_sum_flush(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct tg_incremental_sum *g = (struct tg_incremental_sum *)r->time_grouping.data;
+
+    NETDATA_DOUBLE value;
+
+    if(unlikely(!g->count || isnan(g->first) || isnan(g->last))) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = g->last - g->first;
+    }
+
+    g->first = g->last;
+    g->last = NAN;
+    g->count = 0;
+
+    return value;
+}
+
+#endif //NETDATA_API_QUERY_INCREMENTAL_SUM_H