1 files changed, 120 insertions, 0 deletions
diff --git a/database/storage_engine.c b/database/storage_engine.c
new file mode 100644
index 000000000..36f01de16
--- /dev/null
+++ b/database/storage_engine.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "storage_engine.h"
+#include "ram/rrddim_mem.h"
+#ifdef ENABLE_DBENGINE
+#include "engine/rrdengineapi.h"
+#endif
+
+#define im_collect_ops { \
+    .init = rrddim_collect_init,\
+    .store_metric = rrddim_collect_store_metric,\
+    .finalize = rrddim_collect_finalize\
+}
+
+#define im_query_ops { \
+    .init = rrddim_query_init, \
+    .next_metric = rrddim_query_next_metric, \
+    .is_finished = rrddim_query_is_finished, \
+    .finalize = rrddim_query_finalize, \
+    .latest_time = rrddim_query_latest_time, \
+    .oldest_time = rrddim_query_oldest_time \
+}
+
+static STORAGE_ENGINE engines[] = {
+    {
+        .id = RRD_MEMORY_MODE_NONE,
+        .name = RRD_MEMORY_MODE_NONE_NAME,
+        .api = {
+            .collect_ops = im_collect_ops,
+            .query_ops = im_query_ops
+        }
+    },
+    {
+        .id = RRD_MEMORY_MODE_RAM,
+        .name = RRD_MEMORY_MODE_RAM_NAME,
+        .api = {
+            .collect_ops = im_collect_ops,
+            .query_ops = im_query_ops
+        }
+    },
+    {
+        .id = RRD_MEMORY_MODE_MAP,
+        .name = RRD_MEMORY_MODE_MAP_NAME,
+        .api = {
+            .collect_ops = im_collect_ops,
+            .query_ops = im_query_ops
+        }
+    },
+    {
+        .id = RRD_MEMORY_MODE_SAVE,
+        .name = RRD_MEMORY_MODE_SAVE_NAME,
+        .api = {
+            .collect_ops = im_collect_ops,
+            .query_ops = im_query_ops
+        }
+    },
+    {
+        .id = RRD_MEMORY_MODE_ALLOC,
+        .name = RRD_MEMORY_MODE_ALLOC_NAME,
+        .api = {
+            .collect_ops = im_collect_ops,
+            .query_ops = im_query_ops
+        }
+    },
+#ifdef ENABLE_DBENGINE
+    {
+        .id = RRD_MEMORY_MODE_DBENGINE,
+        .name = RRD_MEMORY_MODE_DBENGINE_NAME,
+        .api = {
+            .collect_ops = {
+                .init = rrdeng_store_metric_init,
+                .store_metric = rrdeng_store_metric_next,
+                .finalize = rrdeng_store_metric_finalize
+            },
+            .query_ops = {
+                .init = rrdeng_load_metric_init,
+                .next_metric = rrdeng_load_metric_next,
+                .is_finished = rrdeng_load_metric_is_finished,
+                .finalize = rrdeng_load_metric_finalize,
+                .latest_time = rrdeng_metric_latest_time,
+                .oldest_time = rrdeng_metric_oldest_time
+            }
+        }
+    },
+#endif
+    { .id = RRD_MEMORY_MODE_NONE, .name = NULL }
+};
+
+STORAGE_ENGINE* storage_engine_find(const char* name)
+{
+    for (STORAGE_ENGINE* it = engines; it->name; it++) {
+        if (strcmp(it->name, name) == 0)
+            return it;
+    }
+    return NULL;
+}
+
+STORAGE_ENGINE* storage_engine_get(RRD_MEMORY_MODE mmode)
+{
+    for (STORAGE_ENGINE* it = engines; it->name; it++) {
+        if (it->id == mmode)
+            return it;
+    }
+    return NULL;
+}
+
+STORAGE_ENGINE* storage_engine_foreach_init()
+{
+    // Assuming at least one engine exists
+    return &engines[0];
+}
+
+STORAGE_ENGINE* storage_engine_foreach_next(STORAGE_ENGINE* it)
+{
+    if (!it || !it->name)
+        return NULL;
+
+    it++;
+    return it->name ? it : NULL;
+}