152 lines
4.5 KiB
C++
152 lines
4.5 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_router/static_router.h"
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#include "gtest/gtest.h"
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#include "pw_assert/check.h"
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#include "pw_router/egress_function.h"
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namespace pw::router {
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namespace {
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struct BasicPacket {
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static constexpr uint32_t kMagic = 0x8badf00d;
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constexpr BasicPacket(uint32_t addr, uint64_t data)
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: magic(kMagic), address(addr), priority(0), payload(data) {}
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constexpr BasicPacket(uint32_t addr, uint32_t prio, uint64_t data)
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: magic(kMagic), address(addr), priority(prio), payload(data) {}
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ConstByteSpan data() const { return std::as_bytes(std::span(this, 1)); }
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uint32_t magic;
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uint32_t address;
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uint32_t priority;
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uint64_t payload;
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};
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class BasicPacketParser : public PacketParser {
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public:
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constexpr BasicPacketParser() : packet_(nullptr) {}
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bool Parse(pw::ConstByteSpan packet) final {
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packet_ = reinterpret_cast<const BasicPacket*>(packet.data());
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return packet_->magic == BasicPacket::kMagic;
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}
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std::optional<uint32_t> GetDestinationAddress() const final {
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PW_DCHECK_NOTNULL(packet_);
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return packet_->address;
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}
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uint32_t priority() const {
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PW_DCHECK_NOTNULL(packet_);
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return packet_->priority;
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};
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private:
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const BasicPacket* packet_;
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};
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EgressFunction GoodEgress(+[](ConstByteSpan, const PacketParser&) {
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return OkStatus();
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});
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EgressFunction BadEgress(+[](ConstByteSpan, const PacketParser&) {
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return Status::ResourceExhausted();
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});
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TEST(StaticRouter, RoutePacket_RoutesToAnEgress) {
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BasicPacketParser parser;
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constexpr StaticRouter::Route routes[] = {{1, GoodEgress}, {2, BadEgress}};
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StaticRouter router(routes);
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EXPECT_EQ(router.RoutePacket(BasicPacket(1, 0xdddd).data(), parser),
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OkStatus());
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EXPECT_EQ(router.RoutePacket(BasicPacket(2, 0xdddd).data(), parser),
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Status::Unavailable());
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}
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TEST(StaticRouter, RoutePacket_ForwardsPacketParser) {
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uint32_t parser_priority = 0xffffffff;
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EgressFunction parser_egress(
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[&parser_priority](ConstByteSpan, const PacketParser& parser) {
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const BasicPacketParser& basic_parser =
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static_cast<const BasicPacketParser&>(parser);
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parser_priority = basic_parser.priority();
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return OkStatus();
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});
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StaticRouter::Route routes[] = {{1, parser_egress}};
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StaticRouter router(routes);
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BasicPacketParser parser;
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EXPECT_EQ(router.RoutePacket(BasicPacket(1, 71, 0xdddd).data(), parser),
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OkStatus());
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EXPECT_EQ(parser_priority, 71u);
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}
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TEST(StaticRouter, RoutePacket_ReturnsParserError) {
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BasicPacketParser parser;
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constexpr StaticRouter::Route routes[] = {{1, GoodEgress}, {2, BadEgress}};
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StaticRouter router(routes);
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BasicPacket bad_magic(1, 0xdddd);
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bad_magic.magic = 0x1badda7a;
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EXPECT_EQ(router.RoutePacket(bad_magic.data(), parser), Status::DataLoss());
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}
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TEST(StaticRouter, RoutePacket_ReturnsNotFoundOnInvalidRoute) {
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BasicPacketParser parser;
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constexpr StaticRouter::Route routes[] = {{1, GoodEgress}, {2, BadEgress}};
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StaticRouter router(routes);
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EXPECT_EQ(router.RoutePacket(BasicPacket(42, 0xdddd).data(), parser),
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Status::NotFound());
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}
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TEST(StaticRouter, RoutePacket_TracksNumberOfDrops) {
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BasicPacketParser parser;
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constexpr StaticRouter::Route routes[] = {{1, GoodEgress}, {2, BadEgress}};
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StaticRouter router(routes);
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// Good
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EXPECT_EQ(router.RoutePacket(BasicPacket(1, 0xdddd).data(), parser),
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OkStatus());
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// Egress error
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EXPECT_EQ(router.RoutePacket(BasicPacket(2, 0xdddd).data(), parser),
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Status::Unavailable());
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// Parser error
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BasicPacket bad_magic(1, 0xdddd);
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bad_magic.magic = 0x1badda7a;
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EXPECT_EQ(router.RoutePacket(bad_magic.data(), parser), Status::DataLoss());
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// Good
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EXPECT_EQ(router.RoutePacket(BasicPacket(1, 0xdddd).data(), parser),
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OkStatus());
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// Bad route
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EXPECT_EQ(router.RoutePacket(BasicPacket(42, 0xdddd).data(), parser),
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Status::NotFound());
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EXPECT_EQ(router.dropped_packets(), 3u);
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}
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} // namespace
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} // namespace pw::router
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