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// Copyright 2020 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
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// 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.
#include "pw_rpc/internal/packet.h"
#include "gtest/gtest.h"
#include "pw_bytes/array.h"
#include "pw_protobuf/wire_format.h"
namespace pw::rpc::internal {
namespace {
using protobuf::FieldKey;
using ::pw::rpc::internal::pwpb::PacketType;
using std::byte;
constexpr auto kPayload = bytes::Array<0x82, 0x02, 0xff, 0xff>();
constexpr auto kEncoded = bytes::Array<
// Payload
uint32_t(FieldKey(5, protobuf::WireType::kDelimited)),
0x04,
0x82,
0x02,
0xff,
0xff,
// Packet type
uint32_t(FieldKey(1, protobuf::WireType::kVarint)),
1, // RESPONSE
// Channel ID
uint32_t(FieldKey(2, protobuf::WireType::kVarint)),
1,
// Service ID
uint32_t(FieldKey(3, protobuf::WireType::kFixed32)),
42,
0,
0,
0,
// Method ID
uint32_t(FieldKey(4, protobuf::WireType::kFixed32)),
100,
0,
0,
0,
// Status (not encoded if it is zero)
// FieldKey(6, protobuf::WireType::kVarint),
// 0x00
// Call ID
uint32_t(FieldKey(7, protobuf::WireType::kVarint)),
7>();
// Test that a default-constructed packet sets its members to the default
// protobuf values.
static_assert(Packet().type() == PacketType{});
static_assert(Packet().channel_id() == 0);
static_assert(Packet().service_id() == 0);
static_assert(Packet().method_id() == 0);
static_assert(Packet().status() == static_cast<Status::Code>(0));
static_assert(Packet().payload().empty());
TEST(Packet, Encode) {
byte buffer[64];
Packet packet(PacketType::RESPONSE, 1, 42, 100, 7, kPayload);
auto result = packet.Encode(buffer);
ASSERT_EQ(OkStatus(), result.status());
ASSERT_EQ(kEncoded.size(), result.value().size());
EXPECT_EQ(std::memcmp(kEncoded.data(), buffer, kEncoded.size()), 0);
}
TEST(Packet, Encode_BufferTooSmall) {
byte buffer[2];
Packet packet(PacketType::RESPONSE, 1, 42, 100, 0, kPayload);
auto result = packet.Encode(buffer);
EXPECT_EQ(Status::ResourceExhausted(), result.status());
}
TEST(Packet, Decode_ValidPacket) {
auto result = Packet::FromBuffer(kEncoded);
ASSERT_TRUE(result.ok());
auto& packet = result.value();
EXPECT_EQ(PacketType::RESPONSE, packet.type());
EXPECT_EQ(1u, packet.channel_id());
EXPECT_EQ(42u, packet.service_id());
EXPECT_EQ(100u, packet.method_id());
EXPECT_EQ(7u, packet.call_id());
ASSERT_EQ(sizeof(kPayload), packet.payload().size());
EXPECT_EQ(
0,
std::memcmp(packet.payload().data(), kPayload.data(), kPayload.size()));
}
TEST(Packet, Decode_InvalidPacket) {
byte bad_data[] = {byte{0xFF}, byte{0x00}, byte{0x00}, byte{0xFF}};
EXPECT_EQ(Status::DataLoss(), Packet::FromBuffer(bad_data).status());
}
TEST(Packet, EncodeDecode) {
constexpr byte payload[]{byte(0x00), byte(0x01), byte(0x02), byte(0x03)};
Packet packet;
packet.set_channel_id(12);
packet.set_service_id(0xdeadbeef);
packet.set_method_id(0x03a82921);
packet.set_call_id(33);
packet.set_payload(payload);
packet.set_status(Status::Unavailable());
byte buffer[128];
Result result = packet.Encode(buffer);
ASSERT_EQ(result.status(), OkStatus());
span<byte> packet_data(buffer, result.value().size());
auto decode_result = Packet::FromBuffer(packet_data);
ASSERT_TRUE(decode_result.ok());
auto& decoded = decode_result.value();
EXPECT_EQ(decoded.type(), packet.type());
EXPECT_EQ(decoded.channel_id(), packet.channel_id());
EXPECT_EQ(decoded.service_id(), packet.service_id());
EXPECT_EQ(decoded.method_id(), packet.method_id());
EXPECT_EQ(decoded.call_id(), packet.call_id());
ASSERT_EQ(decoded.payload().size(), packet.payload().size());
EXPECT_EQ(std::memcmp(decoded.payload().data(),
packet.payload().data(),
packet.payload().size()),
0);
EXPECT_EQ(decoded.status(), Status::Unavailable());
}
constexpr size_t kReservedSize = 2 /* type */ + 2 /* channel */ +
5 /* service */ + 5 /* method */ +
2 /* payload key */ + 2 /* status */;
TEST(Packet, PayloadUsableSpace_ExactFit) {
EXPECT_EQ(kReservedSize,
Packet(PacketType::RESPONSE, 1, 42, 100).MinEncodedSizeBytes());
}
TEST(Packet, PayloadUsableSpace_LargerVarints) {
EXPECT_EQ(
kReservedSize + 2 /* channel */, // service and method are Fixed32
Packet(PacketType::RESPONSE, 17000, 200, 200).MinEncodedSizeBytes());
}
} // namespace
} // namespace pw::rpc::internal
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