Qt GRPC クライアントガイド

clientGuide.unaryCall(ClientGuide::createRequest(1));
clientGuide.unaryCall(ClientGuide::createRequest(2, ExpectedResult::Failure));
clientGuide.unaryCall(ClientGuide::createRequest(3));

Welcome to the clientguide!
Starting the server process ...
    Server listening on: localhost:50056
    Server (UnaryCall): Request( time: 1733498584776, num: 1 )
    Server (UnaryCall): Request( time: 9223372036854775807, num: 2 )
    Server (UnaryCall): Request( time: 1733498584776, num: 3 )
Client (UnaryCall) finished, received: Response( time:  1733498584778257 , num:  1  )
Client (UnaryCall) failed: QGrpcStatus( code: QtGrpc::StatusCode::InvalidArgument, message: "Request time is in the future!" )
Client (UnaryCall) finished, received: Response( time:  1733498584778409 , num:  3  )

clientGuide.serverStreaming(ClientGuide::createRequest(3));

Welcome to the clientguide!
Starting the server process ...
    Server listening on: localhost:50056
    Server (ServerStreaming): Request( time: 1733504435800, num: 3 )
Client (ServerStream) received: Response( time:  1733504435801724 , num:  0  )
Client (ServerStream) received: Response( time:  1733504435801871 , num:  1  )
Client (ServerStream) received: Response( time:  1733504435801913 , num:  2  )
Client (ServerStreaming) finished

clientGuide.clientStreaming(ClientGuide::createRequest(0, ExpectedResult::Failure));

Welcome to the clientguide!
Starting the server process ...
    Server listening on: localhost:50056
    Server (ClientStreaming): Request( time: 9223372036854775807, num: 0 )
Client (ClientStreaming) failed: QGrpcStatus( code: QtGrpc::StatusCode::InvalidArgument, message: "Request time is in the future!" )
Restarting the client stream
    Server (ClientStreaming): Request( time: 1733912946696, num: 0 )
    Server (ClientStreaming): Request( time: 1733912946697, num: 1 )
    Server (ClientStreaming): Request( time: 1733912946697, num: 2 )
Client (ClientStreaming) finished, received: Response( time:  1733912946696922 , num:  3  )

clientGuide.bidirectionalStreaming(ClientGuide::createRequest(3));

Welcome to the clientguide!
Starting the server process ...
    Server listening on: localhost:50056
    Server (BidirectionalStreaming): Request( time: 1733503832107, num: 3 )
Client (BidirectionalStreaming) received: Response( time:  1733503832108708 , num:  3  )
    Server (BidirectionalStreaming): Request( time: 1733503832109, num: 2 )
Client (BidirectionalStreaming) received: Response( time:  1733503832109024 , num:  2  )
    Server (BidirectionalStreaming): Request( time: 1733503832109, num: 1 )
Client (BidirectionalStreaming) received: Response( time:  1733503832109305 , num:  1  )
    Server (BidirectionalStreaming): Request( time: 1733503832109, num: 0 )
Client (BidirectionalStreaming) received: Response( time:  1733503832109529 , num:  0  )
Client (BidirectionalStreaming) finished

QGrpcStartInterceptor::Continuation
MetricsInterceptor::onStart(QGrpcInterceptionContext &context,
                            QProtobufMessage & /*message*/,
                            QGrpcCallOptions &callOptions)
{
    m_activeRPCs.insert(context.operationId(), std::chrono::steady_clock::now());
    callOptions.addMetadata("x-trace-id"_L1, QUuid::createUuid().toByteArray());

    return Continuation::Proceed;
}

void MetricsInterceptor::onMessageReceived(QGrpcInterceptionContext &context,
                                           QByteArray &messageData)
{
    m_metrics[context.descriptor()].bytesReceived += messageData.size();
}

void MetricsInterceptor::onFinished(QGrpcInterceptionContext &context,
                                    QGrpcStatus &status)
{
    const auto it = m_activeRPCs.find(context.operationId());
    Q_ASSERT(it != m_activeRPCs.cend());

    const auto duration = Ms(Clock::now() - it.value()).count();
    m_activeRPCs.erase(it);

    auto &metrics = m_metrics[context.descriptor()];
    if (!status.isOk()) {
        ++metrics.failed;
        return;
    }
    ++metrics.completed;
    metrics.durations.append(duration);
}

MetricsInterceptor::~MetricsInterceptor()
{
    Q_ASSERT(m_activeRPCs.isEmpty());
    const autokeys=m_metrics.keys();
    for(const auto &k: keys) {
        qInfo() << "Metrics for:" << k;
       const auto &m =m_metrics[k];
        qInfo() << "  Bytes received    :" << m.bytesReceived;
        qInfo() << "  Failed RPCs       :" << m.failed;
        qInfo() << "  Completed RPCs    :" << m.completed;
        qInfo() << "  Completed Durations (ms):" << m.durations;
    }
}

TokenProvider::TokenProvider() { refresh(); }
QByteArray TokenProvider::token() { return m_token; }
void TokenProvider::refresh()
{
    // NOTE: This is NOT a real JWT or secure token.
    // It only mimics the structure: header.payload.signature
    // The payload is just a timestamp used for expiry checks.
    auto header = R"({"alg":"none","typ":"JWT"})"_ba; // fake header
    auto payload = QByteArray::number(now()); // fake "iat"
    auto signature = "no_signature"_ba; // fake signing

    m_token = header + '.' + payload + '.' + signature;
}

if (auto authStatus = validateAuth(context); !authStatus.ok())
    return authStatus;

QGrpcStartInterceptor::Continuation
AuthInterceptor::onStart(QGrpcInterceptionContext& /*context*/,
                         QProtobufMessage& /*メッセージ*/,
                         QGrpcCallOptions&callOptions)
{
    constexpr QByteArrayView AuthKey("authorization");

    if(!callOptions.metadata(QtGrpc::MultiValue).contains(AuthKey))
        callOptions.addMetadata(AuthKey, "Bearer " +m_tokenProvider.token());

    returnContinuation::Proceed;
}

voidAuthInterceptor::onTrailingMetadata(QGrpcInterceptionContext& /*context*/,
                                         QMultiHash<QByteArray,QByteArray> &metadata)
{
    constexpr QByteArrayView AuthErrorKey("www-authenticate");
    const autoit=metadata.constFind(AuthErrorKey);
   if(it==metadata.cend())
        return;
    m_serverAuthHint=it.value();
}

voidAuthInterceptor::onFinished(QGrpcInterceptionContext& /*context*/,QGrpcStatus&status)
{
    // 認証されていないステータスコードのみを処理する。
    if(status.code()!=QtGrpc::StatusCode::Unauthenticated)
        return;

    qDebug("[AuthInterceptor] Refreshing token for next call");
   // 注：例として簡略化しています。実際のトークンは、適切な認証フローを通じて取得されます。
    m_tokenProvider.refresh();
    if(!m_serverAuthHint.isEmpty()) {
        status=QGrpcStatus{ status.code(),status.message()+u", ヒント: "_s+m_serverAuthHint };
        m_serverAuthHint.clear();
    }
}

qsizetype getTotalBytes(const QMultiHash<QByteArray, QByteArray> &md)
{
    qsizetype total = 0;
    for (const auto &[k, v] : md.asKeyValueRange())
        total += k.size() + v.size();
    return total;
}

template <typename T>
void sanitizeMessage(T &request)
{
    const auto num = request.num();
    if (num < 0 || num > 5)
        request.setNum(qBound(0, num, 5));

    const auto time = request.time();
    const auto currentTime = now();
    if (time < 0 || time > currentTime)
        request.setTime(qMax(0, currentTime));
}

QGrpcStartInterceptor::続き
SanitizingInterceptor::onStart(QGrpcInterceptionContext&context,QProtobufMessage&message,
                               QGrpcCallOptions&callOptions)
{
    constexpr quint16 MaxMetadata= 1024 * 8;// 8 KiB
    autototalMdBytes=getTotalBytes(callOptions.metadata(QtGrpc::MultiValue));
    if(totalMdBytes>MaxMetadata) {
        qDebug() << "[Sanitizing] Aborting call with metadata size of" << totalMdBytes << "bytes";
       returnContinuation::Drop;
    }

    onWriteMessage(context,message);

    returnContinuation::Proceed;
}

voidSanitizingInterceptor::onWriteMessage(QGrpcInterceptionContext& /*context*/,
                                           QProtobufMessage&message)
{
    // さまざまな Request メッセージ型を含むより複雑なシナリオを処理するには、
    // context.descriptor() に基づいて適切に分岐させるのが理にかなっている。
   if(auto *request =qprotobufmessage_cast<client::guide::Request*>(&message))
        sanitizeMessage(*request);
}

voidSanitizingInterceptor::onMessageReceived(QGrpcInterceptionContext&context,
                                              QByteArray&messageData)
{
    // messageData の型は client::guide::Response のみです。より
    // 複雑な処理を行う 場合は、 context.descriptor() を使用して適切な処理を追加してください。
    // なお、デシリアライズおよびシリアライズにはオーバーヘッドが生じることに注意してください。
   client::guide::Response response;
   autoserializer=context.channel().serializer();
    if(serializer->deserialize(&response,messageData))
        return;
    sanitizeMessage(response);
    messageData= serializer->serialize(&response);
}

Welcome to the clientguide!
Running with Interceptor support
Starting the server process ...
    Server listening on: localhost:50056
    Server (UnaryCall): Request( time: 1774360832277, num: 1 ), Metadata: { x-trace-id: {360bb041-9ab5-4940-95c1-0d4c89491570} }
Client (UnaryCall) finished, received: Response( time: 1774360832278, num: 1 )
    Server (UnaryCall): Request( time: 1774360832427, num: 2 ), Metadata: { x-trace-id: {01817a8f-9f0e-404e-a21c-767f81e74a2d} }
Client (UnaryCall) finished, received: Response( time: 1774360832429, num: 2 )
    Server (UnaryCall): Request( time: 1774360832577, num: 3 ), Metadata: { x-trace-id: {78cb336f-0396-4bbc-b1ee-59914651feef} }
Client (UnaryCall) finished, received: Response( time: 1774360832578, num: 3 )
[AuthInterceptor] Refreshing token for next call
Client (UnaryCall) failed: QGrpcStatus( code: QtGrpc::StatusCode::Unauthenticated, message: "Token expired with age: 603 ms, Hint: Bearer realm=\"clientguide\", error=\"invalid_token\"" )
    Server (UnaryCall): Request( time: 1774360832876, num: 5 ), Metadata: { x-trace-id: {63a40327-2f46-43c4-9e2c-44b67f297bd2} }
Client (UnaryCall) finished, received: Response( time: 1774360832877, num: 5 )
[Sanitizing] Aborting call with metadata size of 80129 bytes
Client (UnaryCall) failed: QGrpcStatus( code: QtGrpc::StatusCode::Aborted, message: "Interceptors dropped the call" )
    Server (BidirectionalStreaming) accepted call, Metadata: { x-trace-id: {fc945bdb-5c8a-4c65-8bfb-8655800d5774} }
    Server (BidirectionalStreaming): Request( time: 1774360833177, num: 5 )
Client (BidirectionalStreaming) received: Response( time: 1774360833178, num: 5 )
    Server (BidirectionalStreaming): Request( time: 1774360833178, num: 4 )
Client (BidirectionalStreaming) received: Response( time: 1774360833179, num: 4 )
    Server (BidirectionalStreaming): Request( time: 1774360833179, num: 3 )
Client (BidirectionalStreaming) received: Response( time: 1774360833179, num: 3 )
    Server (BidirectionalStreaming): Request( time: 1774360833179, num: 2 )
Client (BidirectionalStreaming) received: Response( time: 1774360833180, num: 2 )
    Server (BidirectionalStreaming): Request( time: 1774360833180, num: 1 )
Client (BidirectionalStreaming) received: Response( time: 1774360833180, num: 1 )
    Server (BidirectionalStreaming): Request( time: 1774360833180, num: 0 )
Client (BidirectionalStreaming) received: Response( time: 1774360833180, num: 0 )
Client (BidirectionalStreaming) finished
All operations completed! Automatically shutting down...
Metrics for: QtGrpc::RpcDescriptor( service: "client.guide.ClientGuideService", method: "BidirectionalStreaming", type: QtGrpc::RpcType::BidiStreaming )
Bytes received    : 52
Failed RPCs       : 0
Completed RPCs    : 1
Completed Durations (ms): QList(3.97233)
Metrics for: QtGrpc::RpcDescriptor( service: "client.guide.ClientGuideService", method: "UnaryCall", type: QtGrpc::RpcType::UnaryCall )
Bytes received    : 36
Failed RPCs       : 2
Completed RPCs    : 4
Completed Durations (ms): QList(1.937, 1.90971, 1.624, 1.50429)