C++ View::data方法代码示例

void NetworkInterfaceASIO::_recvMessageBody(AsyncOp* op) {
    // TODO: This error code should be more meaningful.
    std::error_code ec;

    // validate message length
    int len = op->header()->constView().getMessageLength();
    if (len == 542393671) {
        LOG(3) << "attempt to access MongoDB over HTTP on the native driver port.";
        return _networkErrorCallback(op, ec);
    } else if (len == -1) {
        // TODO: An endian check is run after the client connects, we should
        // set that we've received the client's handshake
        LOG(3) << "Endian check received from client";
        return _networkErrorCallback(op, ec);
    } else if (static_cast<size_t>(len) < sizeof(MSGHEADER::Value) ||
               static_cast<size_t>(len) > MaxMessageSizeBytes) {
        warning() << "recv(): message len " << len << " is invalid. "
                  << "Min " << sizeof(MSGHEADER::Value) << " Max: " << MaxMessageSizeBytes;
        return _networkErrorCallback(op, ec);
    }

    // validate response id
    uint32_t expectedId = op->toSend()->header().getId();
    uint32_t actualId = op->header()->constView().getResponseTo();
    if (actualId != expectedId) {
        LOG(3) << "got wrong response:"
               << " expected response id: " << expectedId << ", got response id: " << actualId;
        return _networkErrorCallback(op, ec);
    }

    int z = (len + 1023) & 0xfffffc00;
    invariant(z >= len);
    op->toRecv()->setData(reinterpret_cast<char*>(mongoMalloc(z)), true);
    MsgData::View mdView = op->toRecv()->buf();

    // copy header data into master buffer
    int headerLen = sizeof(MSGHEADER::Value);
    memcpy(mdView.view2ptr(), op->header(), headerLen);
    int bodyLength = len - headerLen;
    invariant(bodyLength >= 0);

    // receive remaining data into md->data
    asio::async_read(op->connection()->sock(),
                     asio::buffer(mdView.data(), bodyLength),
                     [this, op, mdView](asio::error_code ec, size_t bytes) {

                         if (op->canceled()) {
                             return _completeOperation(op, kCanceledStatus);
                         }

                         if (ec) {
                             LOG(3) << "error receiving message body";
                             return _networkErrorCallback(op, ec);
                         }

                         return _completedWriteCallback(op);
                     });
}

bool MessagingPort::recv(Message& m) {
    try {
#ifdef MONGO_CONFIG_SSL
    again:
#endif
        // mmm( log() << "*  recv() sock:" << this->sock << endl; )
        MSGHEADER::Value header;
        int headerLen = sizeof(MSGHEADER::Value);
        psock->recv((char*)&header, headerLen);
        int len = header.constView().getMessageLength();

        if (len == 542393671) {
            // an http GET
            string msg =
                "It looks like you are trying to access MongoDB over HTTP on the native driver "
                "port.\n";
            LOG(psock->getLogLevel()) << msg;
            std::stringstream ss;
            ss << "HTTP/1.0 200 OK\r\nConnection: close\r\nContent-Type: "
                  "text/plain\r\nContent-Length: " << msg.size() << "\r\n\r\n" << msg;
            string s = ss.str();
            send(s.c_str(), s.size(), "http");
            return false;
        }
        // If responseTo is not 0 or -1 for first packet assume SSL
        else if (psock->isAwaitingHandshake()) {
#ifndef MONGO_CONFIG_SSL
            if (header.constView().getResponseTo() != 0 &&
                header.constView().getResponseTo() != -1) {
                uasserted(17133,
                          "SSL handshake requested, SSL feature not available in this build");
            }
#else
            if (header.constView().getResponseTo() != 0 &&
                header.constView().getResponseTo() != -1) {
                uassert(17132,
                        "SSL handshake received but server is started without SSL support",
                        sslGlobalParams.sslMode.load() != SSLParams::SSLMode_disabled);
                setX509SubjectName(
                    psock->doSSLHandshake(reinterpret_cast<const char*>(&header), sizeof(header)));
                psock->setHandshakeReceived();
                goto again;
            }
            uassert(17189,
                    "The server is configured to only allow SSL connections",
                    sslGlobalParams.sslMode.load() != SSLParams::SSLMode_requireSSL);
#endif  // MONGO_CONFIG_SSL
        }
        if (static_cast<size_t>(len) < sizeof(MSGHEADER::Value) ||
            static_cast<size_t>(len) > MaxMessageSizeBytes) {
            LOG(0) << "recv(): message len " << len << " is invalid. "
                   << "Min " << sizeof(MSGHEADER::Value) << " Max: " << MaxMessageSizeBytes;
            return false;
        }

        psock->setHandshakeReceived();
        int z = (len + 1023) & 0xfffffc00;
        verify(z >= len);
        MsgData::View md = reinterpret_cast<char*>(mongolMalloc(z));
        ScopeGuard guard = MakeGuard(free, md.view2ptr());
        verify(md.view2ptr());

        memcpy(md.view2ptr(), &header, headerLen);
        int left = len - headerLen;

        psock->recv(md.data(), left);

        guard.Dismiss();
        m.setData(md.view2ptr(), true);
        return true;

    } catch (const SocketException& e) {
        logger::LogSeverity severity = psock->getLogLevel();
        if (!e.shouldPrint())
            severity = severity.lessSevere();
        LOG(severity) << "SocketException: remote: " << remote() << " error: " << e;
        m.reset();
        return false;
    }
}