Function _DeleteGraphMetaKeys

src/module_event_handlers.c:169–211

delete meta keys, upon RDB encode or decode finished event triggering the decode flag represent the event

// delete meta keys, upon RDB encode or decode finished event triggering
// the decode flag represent the event
static void _DeleteGraphMetaKeys
(
	RedisModuleCtx *ctx,
	GraphContext *gc,
	bool decode
) {
	uint key_count;
	unsigned char **keys;

	// get the meta keys required, according to the "decode" flag.
	if(decode) {
		keys = GraphDecodeContext_GetMetaKeys(gc->decoding_context);
	} else {
		keys = GraphEncodeContext_GetMetaKeys(gc->encoding_context);
	}

	key_count = array_len(keys);
	for(uint i = 0; i < key_count; i++) {
		RedisModuleString *meta_rm_string =
			RedisModule_CreateStringPrintf(ctx, "%s", keys[i]);

		RedisModuleKey *key =
			RedisModule_OpenKey(ctx, meta_rm_string, REDISMODULE_WRITE);

		RedisModule_DeleteKey(key);
		RedisModule_CloseKey(key);
		RedisModule_FreeString(ctx, meta_rm_string);

		rm_free(keys[i]);
	}

	array_free(keys);

	// clear the relevant context meta keys as they are no longer valid
	if(decode) {
		GraphDecodeContext_ClearMetaKeys(gc->decoding_context);
	} else {
		GraphEncodeContext_ClearMetaKeys(gc->encoding_context);
	}

	RedisModule_Log(ctx, "notice", "Deleted %d virtual keys for graph %s",
			key_count, gc->graph_name);
}

// create the meta keys for each graph in the keyspace
// used on RDB start event