Method call

src/ExtCmd.actor.cpp:1203–1233

struct ListCollectionsCmd {
	static const char* name;
	ACTOR static Future<Reference<ExtMsgReply>> call(Reference<ExtConnection> ec,
	                                                 Reference<ExtMsgQuery> msg,
	                                                 Reference<ExtMsgReply> reply) {
		if (msg->query.hasField("cursor")) {
			const auto cursorObj = msg->query.getObjectField("cursor");
			if (cursorObj.hasField("batchSize") && cursorObj.getIntField("batchSize") != 0) {
				TraceEvent(SevWarn, "unsupportedCmdOption")
				    .detail("cmd", "listCollections")
				    .detail("option", "cursor.batchSize");
				throw unsupported_cmd_option();
			}
		}

		state std::string databaseName = msg->getDBName();
		state Reference<DocTransaction> dtr = ec->getOperationTransaction();
		state Standalone<VectorRef<StringRef>> names;
		loop {
			try {
				Standalone<VectorRef<StringRef>> _names =
				    wait(ec->docLayer->rootDirectory->list(dtr->tr, {StringRef(databaseName)}));
				names = _names;
				break;
			} catch (Error& e) {
				// If directory doesn't exist treat like empty database.
				if (e.code() == error_code_directory_does_not_exist) {
					break;
				}
				if (e.code() != error_code_actor_cancelled) {
					wait(dtr->onError(e));
				}
			}
		}

		bson::BSONArrayBuilder collList;