Tools/TestWebKitAPI/Tests/IPC/StreamConnectionBufferTests.cpp

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#include "config.h"

#include "StreamClientConnectionBuffer.h"
#include "StreamServerConnectionBuffer.h"
#include "Test.h"

namespace TestWebKitAPI {

TEST(StreamConnectionBufferTests, CreateWorks)
{
    auto buffer = IPC::StreamClientConnectionBuffer::create(8);
    ASSERT_TRUE(buffer.has_value());
    auto& b = *buffer;
    EXPECT_NE(b.span().data(), nullptr);
    EXPECT_EQ(b.dataSize(), 256u);
    {
        auto server = IPC::StreamServerConnectionBuffer::map(b.createHandle());
        ASSERT_TRUE(server.has_value());
        EXPECT_EQ(b.dataSize(), server->dataSize());
    }
    auto buffer2 = IPC::StreamClientConnectionBuffer::create(24);
    ASSERT_TRUE(buffer2.has_value());
    auto& b2 = *buffer2;
    EXPECT_NE(b2.span().data(), nullptr);
    EXPECT_EQ(b2.dataSize(), 16777216u);
    {
        auto server = IPC::StreamServerConnectionBuffer::map(b2.createHandle());
        ASSERT_TRUE(server.has_value());
        EXPECT_EQ(b2.dataSize(), server->dataSize());
    }
}

class StreamConnectionBufferTest : public ::testing::TestWithParam<std::tuple<unsigned>> {
public:
    unsigned bufferSizeLog2() const
    {
        return std::get<0>(GetParam());
    }

    void SetUp() override
    {
        m_client = IPC::StreamClientConnectionBuffer::create(bufferSizeLog2());
        ASSERT(m_client);
        m_maybeServer = IPC::StreamServerConnectionBuffer::map(m_client->createHandle());
    }

    IPC::StreamClientConnectionBuffer& client() { return *m_client; }
    IPC::StreamServerConnectionBuffer& server() { return *m_maybeServer; }
    bool isValid() const { return m_maybeServer.has_value(); }

protected:
    static constexpr size_t minimumSize = IPC::StreamConnectionEncoder::minimumMessageSize;
    std::optional<IPC::StreamClientConnectionBuffer> m_client;
    std::optional<IPC::StreamServerConnectionBuffer> m_maybeServer;
};

static void fill(std::span<uint8_t> span)
{
    for (size_t i = 0; i < span.size(); ++i)
        span[i] = i;
}

static void expectFilled(std::span<uint8_t> span)
{
    size_t reportFailureCount = 5;
    for (size_t i = 0; i < span.size() && reportFailureCount; ++i) {
        EXPECT_EQ(static_cast<uint8_t>(i), span[i]);
        if (span[i] != static_cast<uint8_t>(i))
            reportFailureCount--;
    }
}

TEST_P(StreamConnectionBufferTest, ClientStartsFull)
{
    ASSERT_TRUE(isValid());
    auto span = client().tryAcquire(0_s);
    ASSERT_TRUE(span.has_value());
    EXPECT_EQ(span->size(), client().dataSize() - 1);
}

TEST_P(StreamConnectionBufferTest, ServerStartsEmpty)
{
    ASSERT_TRUE(isValid());
    auto span = server().tryAcquire();
    EXPECT_FALSE(span.has_value());
}

TEST_P(StreamConnectionBufferTest, ClientWritesFullVisibleInServer)
{
    ASSERT_TRUE(isValid());
    size_t expectedServerSize;
    {
        auto span = client().tryAcquire(0_s);
        ASSERT_TRUE(span.has_value());
        EXPECT_EQ(span->size(), client().dataSize() - 1);
        fill(*span);
        client().release(span->size());
        expectedServerSize = span->size();

        span = client().tryAcquire(0_s);
        ASSERT_FALSE(span.has_value());
    }
    auto serverSpan = server().tryAcquire();
    ASSERT_EQ(expectedServerSize, serverSpan->size());
    expectFilled(*serverSpan);
}

INSTANTIATE_TEST_SUITE_P(StreamConnectionBufferSizedTests,
    StreamConnectionBufferTest,
    testing::Values(6, 9, 14),
    TestParametersToStringFormatter());

}