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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/server.h"
#include <array>
#include <cstdint>
#include "gtest/gtest.h"
#include "pw_assert/assert.h"
#include "pw_rpc/internal/packet.h"
#include "pw_rpc/service.h"
#include "pw_rpc_private/internal_test_utils.h"
namespace pw::rpc {
namespace {
using std::byte;
using internal::Method;
using internal::Packet;
using internal::PacketType;
class TestService : public Service {
public:
TestService(uint32_t service_id)
: Service(service_id, methods_),
methods_{
Method(100),
Method(200),
} {}
Method& method(uint32_t id) {
for (Method& method : methods_) {
if (method.id() == id) {
return method;
}
}
PW_CRASH("Invalid method ID %u", static_cast<unsigned>(id));
}
private:
std::array<Method, 2> methods_;
};
class BasicServer : public ::testing::Test {
protected:
static constexpr byte kDefaultPayload[] = {
byte(0x82), byte(0x02), byte(0xff), byte(0xff)};
BasicServer()
: channels_{
Channel::Create<1>(&output_),
Channel::Create<2>(&output_),
Channel(), // available for assignment
},
server_(channels_),
service_(42) {
server_.RegisterService(service_);
}
std::span<const byte> EncodeRequest(
PacketType type,
uint32_t channel_id,
uint32_t service_id,
uint32_t method_id,
std::span<const byte> payload = kDefaultPayload) {
auto sws = Packet(type, channel_id, service_id, method_id, payload)
.Encode(request_buffer_);
EXPECT_EQ(Status::OK, sws.status());
return std::span(request_buffer_, sws.size());
}
TestOutput<128> output_;
std::array<Channel, 3> channels_;
Server server_;
TestService service_;
private:
byte request_buffer_[64];
};
TEST_F(BasicServer, ProcessPacket_ValidMethod_InvokesMethod) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 42, 100), output_);
const Method& method = service_.method(100);
EXPECT_EQ(1u, method.last_channel_id());
ASSERT_EQ(sizeof(kDefaultPayload), method.last_request().payload().size());
EXPECT_EQ(std::memcmp(kDefaultPayload,
method.last_request().payload().data(),
method.last_request().payload().size()),
0);
}
TEST_F(BasicServer, ProcessPacket_IncompletePacket_NothingIsInvoked) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 0, 42, 101), output_);
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 0, 101), output_);
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 42, 0), output_);
EXPECT_EQ(0u, service_.method(100).last_channel_id());
EXPECT_EQ(0u, service_.method(200).last_channel_id());
}
TEST_F(BasicServer, ProcessPacket_NoChannel_SendsNothing) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 0, 42, 101), output_);
EXPECT_EQ(output_.packet_count(), 0u);
}
TEST_F(BasicServer, ProcessPacket_NoService_SendsDataLoss) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 0, 101), output_);
EXPECT_EQ(output_.sent_packet().type(), PacketType::ERROR);
EXPECT_EQ(output_.sent_packet().status(), Status::DATA_LOSS);
}
TEST_F(BasicServer, ProcessPacket_NoMethod_SendsDataLoss) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 42, 0), output_);
EXPECT_EQ(output_.sent_packet().type(), PacketType::ERROR);
EXPECT_EQ(output_.sent_packet().status(), Status::DATA_LOSS);
}
TEST_F(BasicServer, ProcessPacket_InvalidMethod_NothingIsInvoked) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 42, 101), output_);
EXPECT_EQ(0u, service_.method(100).last_channel_id());
EXPECT_EQ(0u, service_.method(200).last_channel_id());
}
TEST_F(BasicServer, ProcessPacket_InvalidMethod_SendsError) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 42, 27), output_);
const Packet& packet = output_.sent_packet();
EXPECT_EQ(packet.type(), PacketType::ERROR);
EXPECT_EQ(packet.channel_id(), 1u);
EXPECT_EQ(packet.service_id(), 42u);
EXPECT_EQ(packet.method_id(), 27u); // No method ID 27
EXPECT_EQ(packet.status(), Status::NOT_FOUND);
}
TEST_F(BasicServer, ProcessPacket_InvalidService_SendsError) {
server_.ProcessPacket(EncodeRequest(PacketType::RPC, 1, 43, 27), output_);
const Packet& packet = output_.sent_packet();
EXPECT_EQ(packet.type(), PacketType::ERROR);
EXPECT_EQ(packet.channel_id(), 1u);
EXPECT_EQ(packet.service_id(), 43u); // No service ID 43
EXPECT_EQ(packet.method_id(), 27u);
EXPECT_EQ(packet.status(), Status::NOT_FOUND);
}
TEST_F(BasicServer, ProcessPacket_UnassignedChannel_AssignsToAvailableSlot) {
TestOutput<128> unassigned_output;
server_.ProcessPacket(
EncodeRequest(PacketType::RPC, /*channel_id=*/99, 42, 100),
unassigned_output);
EXPECT_EQ(channels_[2].id(), 99u);
}
TEST_F(BasicServer,
ProcessPacket_UnassignedChannel_SendsResourceExhaustedIfCannotAssign) {
channels_[2] = Channel::Create<3>(&output_); // Occupy only available channel
server_.ProcessPacket(
EncodeRequest(PacketType::RPC, /*channel_id=*/99, 42, 27), output_);
const Packet& packet = output_.sent_packet();
EXPECT_EQ(packet.status(), Status::RESOURCE_EXHAUSTED);
EXPECT_EQ(packet.channel_id(), 99u);
EXPECT_EQ(packet.service_id(), 42u);
EXPECT_EQ(packet.method_id(), 27u);
}
TEST_F(BasicServer, ProcessPacket_Cancel_MethodNotActive_SendsError) {
// Set up a fake ServerWriter representing an ongoing RPC.
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 1, 42, 100), output_);
const Packet& packet = output_.sent_packet();
EXPECT_EQ(packet.type(), PacketType::ERROR);
EXPECT_EQ(packet.channel_id(), 1u);
EXPECT_EQ(packet.service_id(), 42u);
EXPECT_EQ(packet.method_id(), 100u);
EXPECT_EQ(packet.status(), Status::FAILED_PRECONDITION);
}
class MethodPending : public BasicServer {
protected:
MethodPending()
: call_(static_cast<internal::Server&>(server_),
static_cast<internal::Channel&>(channels_[0]),
service_,
service_.method(100)),
writer_(call_) {
ASSERT_TRUE(writer_.open());
}
internal::ServerCall call_;
internal::BaseServerWriter writer_;
};
TEST_F(MethodPending, ProcessPacket_Cancel_ClosesServerWriter) {
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 1, 42, 100), output_);
EXPECT_FALSE(writer_.open());
}
TEST_F(MethodPending, ProcessPacket_Cancel_SendsStreamEndPacket) {
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 1, 42, 100), output_);
const Packet& packet = output_.sent_packet();
EXPECT_EQ(packet.type(), PacketType::STREAM_END);
EXPECT_EQ(packet.channel_id(), 1u);
EXPECT_EQ(packet.service_id(), 42u);
EXPECT_EQ(packet.method_id(), 100u);
EXPECT_TRUE(packet.payload().empty());
EXPECT_EQ(packet.status(), Status::CANCELLED);
}
TEST_F(MethodPending, ProcessPacket_Cancel_IncorrectChannel) {
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 2, 42, 100), output_);
EXPECT_EQ(output_.sent_packet().type(), PacketType::ERROR);
EXPECT_EQ(output_.sent_packet().status(), Status::FAILED_PRECONDITION);
EXPECT_TRUE(writer_.open());
}
TEST_F(MethodPending, ProcessPacket_Cancel_IncorrectService) {
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 1, 43, 100), output_);
EXPECT_EQ(output_.sent_packet().type(), PacketType::ERROR);
EXPECT_EQ(output_.sent_packet().status(), Status::NOT_FOUND);
EXPECT_EQ(output_.sent_packet().service_id(), 43u);
EXPECT_EQ(output_.sent_packet().method_id(), 100u);
EXPECT_TRUE(writer_.open());
}
TEST_F(MethodPending, ProcessPacket_CancelIncorrectMethod) {
server_.ProcessPacket(EncodeRequest(PacketType::CANCEL, 1, 42, 101), output_);
EXPECT_EQ(output_.sent_packet().type(), PacketType::ERROR);
EXPECT_EQ(output_.sent_packet().status(), Status::NOT_FOUND);
EXPECT_TRUE(writer_.open());
}
} // namespace
} // namespace pw::rpc