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// Copyright 2021 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <span>
#include "pw_bytes/span.h"
#include "pw_metric/metric.h"
#include "pw_router/egress.h"
#include "pw_router/packet_parser.h"
#include "pw_status/status.h"
namespace pw::router {
// A packet router with a static routing table.
// Thread-safety:
// Internal packet parsing and calls to the provided PacketParser are
// synchronized. Synchronization at the egress level must be implemented by
// derived egresses.
class StaticRouter {
struct Route {
// TODO(frolv): Consider making address size configurable.
uint32_t address;
Egress& egress;
StaticRouter(std::span<const Route> routes) : routes_(routes) {}
StaticRouter(const StaticRouter&) = delete;
StaticRouter(StaticRouter&&) = delete;
StaticRouter& operator=(const StaticRouter&) = delete;
StaticRouter& operator=(StaticRouter&&) = delete;
uint32_t dropped_packets() const {
return parser_errors_.value() + route_errors_.value() +
const metric::Group& metrics() { return metrics_; }
// Routes a single packet through the appropriate egress.
// Returns one of the following to indicate a router-side error:
// OK - Packet sent successfully.
// DATA_LOSS - Packet corrupt or incomplete.
// NOT_FOUND - No registered route for the packet.
// UNAVAILABLE - Route egress did not accept packet.
Status RoutePacket(ConstByteSpan packet, PacketParser& parser);
const std::span<const Route> routes_;
PW_METRIC_GROUP(metrics_, "static_router");
PW_METRIC(metrics_, parser_errors_, "parser_errors", 0u);
PW_METRIC(metrics_, route_errors_, "route_errors", 0u);
PW_METRIC(metrics_, egress_errors_, "egress_errors", 0u);
} // namespace pw::router