2 files changed, 96 insertions, 0 deletions
diff --git a/database/ram/rrddim_mem.c b/database/ram/rrddim_mem.c
new file mode 100644
index 000000000..b17f03ca5
--- /dev/null
+++ b/database/ram/rrddim_mem.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rrddim_mem.h"
+
+// ----------------------------------------------------------------------------
+// RRDDIM legacy data collection functions
+
+void rrddim_collect_init(RRDDIM *rd) {
+    rd->values[rd->rrdset->current_entry] = SN_EMPTY_SLOT;
+    rd->state->handle = calloc(1, sizeof(struct mem_collect_handle));
+}
+void rrddim_collect_store_metric(RRDDIM *rd, usec_t point_in_time, storage_number number) {
+    (void)point_in_time;
+    rd->values[rd->rrdset->current_entry] = number;
+}
+int rrddim_collect_finalize(RRDDIM *rd) {
+    free((struct mem_collect_handle*)rd->state->handle);
+    return 0;
+}
+
+// ----------------------------------------------------------------------------
+// RRDDIM legacy database query functions
+
+void rrddim_query_init(RRDDIM *rd, struct rrddim_query_handle *handle, time_t start_time, time_t end_time) {
+    handle->rd = rd;
+    handle->start_time = start_time;
+    handle->end_time = end_time;
+    struct mem_query_handle* h = calloc(1, sizeof(struct mem_query_handle));
+    h->slot = rrdset_time2slot(rd->rrdset, start_time);
+    h->last_slot = rrdset_time2slot(rd->rrdset, end_time);
+    h->finished = 0;
+    handle->handle = (STORAGE_QUERY_HANDLE *)h;
+}
+
+storage_number rrddim_query_next_metric(struct rrddim_query_handle *handle, time_t *current_time) {
+    RRDDIM *rd = handle->rd;
+    struct mem_query_handle* h = (struct mem_query_handle*)handle->handle;
+    long entries = rd->rrdset->entries;
+    long slot = h->slot;
+
+    (void)current_time;
+    if (unlikely(h->slot == h->last_slot))
+        h->finished = 1;
+    storage_number n = rd->values[slot++];
+
+    if(unlikely(slot >= entries)) slot = 0;
+    h->slot = slot;
+
+    return n;
+}
+
+int rrddim_query_is_finished(struct rrddim_query_handle *handle) {
+    struct mem_query_handle* h = (struct mem_query_handle*)handle->handle;
+    return h->finished;
+}
+
+void rrddim_query_finalize(struct rrddim_query_handle *handle) {
+    freez(handle->handle);
+}
+
+time_t rrddim_query_latest_time(RRDDIM *rd) {
+    return rrdset_last_entry_t_nolock(rd->rrdset);
+}
+
+time_t rrddim_query_oldest_time(RRDDIM *rd) {
+    return rrdset_first_entry_t_nolock(rd->rrdset);
+}
diff --git a/database/ram/rrddim_mem.h b/database/ram/rrddim_mem.h
new file mode 100644
index 000000000..9a215387a
--- /dev/null
+++ b/database/ram/rrddim_mem.h
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_RRDDIMMEM_H
+#define NETDATA_RRDDIMMEM_H
+
+#include "database/rrd.h"
+
+struct mem_collect_handle {
+    long slot;
+    long entries;
+};
+struct mem_query_handle {
+    long slot;
+    long last_slot;
+    uint8_t finished;
+};
+
+extern void rrddim_collect_init(RRDDIM *rd);
+extern void rrddim_collect_store_metric(RRDDIM *rd, usec_t point_in_time, storage_number number);
+extern int rrddim_collect_finalize(RRDDIM *rd);
+
+extern void rrddim_query_init(RRDDIM *rd, struct rrddim_query_handle *handle, time_t start_time, time_t end_time);
+extern storage_number rrddim_query_next_metric(struct rrddim_query_handle *handle, time_t *current_time);
+extern int rrddim_query_is_finished(struct rrddim_query_handle *handle);
+extern void rrddim_query_finalize(struct rrddim_query_handle *handle);
+extern time_t rrddim_query_latest_time(RRDDIM *rd);
+extern time_t rrddim_query_oldest_time(RRDDIM *rd);
+
+#endif