C++ CpiSubscription::RemoveRef方法代码示例

//.........这里部分代码省略.........
        catch (AsciiError&) {
            const Brx& sid = iHeaderSid.Sid();
            LOG2(kEvent, kError, "notification for %.*s failed to include id in path\n", PBUF(sid));
            Error(HttpStatus::kPreconditionFailed);
        }
        subscription = iCpStack.SubscriptionManager().FindSubscription(id);
        if (subscription == NULL) {
            const Brx& sid = iHeaderSid.Sid();
            LOG2(kEvent, kError, "notification for unexpected device - %.*s\n", PBUF(sid))
            Error(HttpStatus::kPreconditionFailed);
        }
    }
    catch(HttpError&) {}
    catch(ReaderError&) {}

    try {
        // write response
        Sws<128> writerBuffer(*this);
        WriterHttpResponse response(writerBuffer);
        response.WriteStatus(*iErrorStatus, Http::eHttp11);
        response.WriteFlush();

        // read entity
        if (subscription != NULL) {
            Bwh entity;
            WriterBwh writer(1024);
            if (iHeaderTransferEncoding.IsChunked()) {
                iDechunker->SetChunked(true);
                for (;;) {
                    Brn buf = iDechunker->Read(kMaxReadBytes);
                    writer.Write(buf);
                    if (buf.Bytes() == 0) { // end of stream
                        break;
                    }
                }
            }
            else {
                TUint length = iHeaderContentLength.ContentLength();
                if (length == 0) {
                    // no Content-Length header, so read until remote socket closed (so ReaderError is thrown)
                    try {
                        for (;;) {
                            writer.Write(iReaderUntil->Read(kMaxReadBytes));
                        }
                    }
                    catch (ReaderError&) {
                    }
                } else {
                    TUint remaining = length;
                    do {
                        Brn buf = iReaderUntil->Read(kMaxReadBytes);
                        remaining -= buf.Bytes();
                        writer.Write(buf);
                    } while (remaining > 0);
                }
            }
            writer.TransferTo(entity);

            // process entity
            {
                const Brx& sid = iHeaderSid.Sid();
                LOG(kEvent, "EventSessionUpnp::Run, sid - %.*s seq - %u\n", PBUF(sid), iHeaderSeq.Seq());
            }

            /* defer validating the seq number till now to avoid holding subscription's lock during
               potentially long-running network reads */
            if (subscription->UpdateSequenceNumber(iHeaderSeq.Seq())) {
                try {
                    ProcessNotification(*subscription, entity);
                }
                catch (Exception& ex) {
                    Log::Print("EventSessionUpnp::Run() unexpected exception %s from %s:%u\n", ex.Message(), ex.File(), ex.Line());
                    ASSERTS(); // ProcessNotification isn't expected to throw
                }
                subscription->Unlock();
            }
            else {
                subscription->SetNotificationError();
            }
        }
    }
    catch(HttpError&) {
        LogError(subscription, "HttpError");
    }
    catch(ReaderError&) {
        LogError(subscription, "ReaderError");
    }
    catch(WriterError&) {
        LogError(subscription, "WriterError");
    }
    catch(NetworkError&) {
        LogError(subscription, "NetworkError");
    }
    catch(XmlError&) {
        LogError(subscription, "XmlError");
    }
    if (subscription != NULL) {
        subscription->RemoveRef();
    }    
}

void EventSessionUpnp::Run()
{
    CpiSubscription* subscription = NULL;
    iErrorStatus = &HttpStatus::kOk;
    try {
        iReaderRequest->Flush();
        iReaderRequest->Read();
        // check headers
        if (iReaderRequest->MethodNotAllowed()) {
            Error(HttpStatus::kBadRequest);
        }

        if (!iHeaderNt.Received() || !iHeaderNts.Received()) {
            Error(HttpStatus::kBadRequest);
        }

        if (iHeaderNt.Value() != kExpectedNt || iHeaderNts.Value() != kExpectedNts ||
            !iHeaderSid.Received() || iHeaderSid.Sid().Bytes() == 0 || !iHeaderSeq.Received()) {
            Error(HttpStatus::kPreconditionFailed);
        }

        subscription = CpiSubscriptionManager::FindSubscription(iHeaderSid.Sid());
        if (subscription == NULL) {
            /* the UPnP spec contains a potential race condition where the first NOTIFY
               message can be processed ahead of the SUBSCRIBE reply which provides
               the sid.  Wait until any in-progress subscriptions complete and try
               again in case that's what has happened here */
            CpiSubscriptionManager::WaitForPendingAdds();
            subscription = CpiSubscriptionManager::FindSubscription(iHeaderSid.Sid());
            if (subscription == NULL) {
                LOG2(kEvent, kError, "notification for unexpected device - ")
                LOG2(kEvent, kError, iHeaderSid.Sid());
                LOG2(kEvent, kError, "\n");
                Error(HttpStatus::kPreconditionFailed);
            }
        }

        if (!subscription->UpdateSequenceNumber(iHeaderSeq.Seq())) {
            subscription->SetNotificationError();
            subscription->RemoveRef();
            subscription = NULL;
        }
    }
    catch(HttpError) {}
    catch(ReaderError) {}

    try {
        // write response
        Sws<128> writerBuffer(*this);
        WriterHttpResponse response(writerBuffer);
        response.WriteStatus(*iErrorStatus, Http::eHttp11);
        response.WriteFlush();

        // read entity
        if (subscription != NULL) {
            Bwh entity;
            if (iHeaderTransferEncoding.IsChunked()) {
                ReaderHttpChunked dechunker(*iReadBuffer);
                dechunker.Read();
                dechunker.TransferTo(entity);
            }
            else {
                TUint length = iHeaderContentLength.ContentLength();
                if (length == 0) {
                    THROW(HttpError);
                }
                entity.Grow(length);
                while (length > 0) {
                    TUint readBytes = (length<kMaxReadBytes? length : kMaxReadBytes);
                    entity.Append(iReadBuffer->Read(readBytes));
                    length -= readBytes;
                }
            }

            // process entity
            LOG(kEvent, "EventSessionUpnp::Run, sid - ");
            LOG(kEvent, iHeaderSid.Sid());
            LOG(kEvent, " seq - %u\n", iHeaderSeq.Seq());
            ProcessNotification(*subscription, entity);
        }
    }
    catch(HttpError) {
        LogError(subscription, "HttpError");
    }
    catch(ReaderError) {
        LogError(subscription, "ReaderError");
    }
    catch(WriterError) {
        LogError(subscription, "WriterError");
    }
    catch(NetworkError) {
        LogError(subscription, "NetworkError");
    }
    catch(XmlError) {
        LogError(subscription, "XmlError");
    }
    if (subscription != NULL) {
        subscription->RemoveRef();
    }    
}

void CpiDeviceLpec::HandleEventedUpdate(const Brx& aUpdate)
{
    Parser parser(aUpdate);
    Brn lpecId = parser.Next(' ');
    Bws<128> sid(iDevice->Udn());
    sid.Append('-');
    sid.Append(lpecId);
    CpiSubscription* subscription = iCpStack.SubscriptionManager().FindSubscription(sid);
    if (subscription == NULL) {
        /* There is a very short window between Subscribe() returning and the new
           subscription being added to its manager.  As a lazy workaround for this,
           sleep for a short period and retry before rejecting the update */
        Thread::Sleep(1000);
        subscription = iCpStack.SubscriptionManager().FindSubscription(sid);
    }
    if (subscription == NULL) {
        LOG(kLpec, "LPEC: evented update received for unknown subscription - ");
        LOG(kLpec, sid);
        LOG(kLpec, "\n");
        return;
    }
    Brn seqBuf = parser.Next(' ');
    TUint seq;
    try {
        seq = Ascii::Uint(seqBuf);
    }
    catch (AsciiError&) {
        LOG(kLpec, "LPEC: invalid sequence number - ");
        LOG(kLpec, seqBuf);
        LOG(kLpec, "in evented update\n");
        subscription->RemoveRef();
        return;
    }
    if (!subscription->UpdateSequenceNumber(seq)) {
        LOG(kLpec, "LPEC: out of sequence update (%d) for ", seq);
        LOG(kLpec, sid);
        LOG(kLpec, "\n");
        subscription->SetNotificationError();
        subscription->RemoveRef();
        return;
    }
    IEventProcessor* processor = static_cast<IEventProcessor*>(subscription);
    processor->EventUpdateStart();
    OutputProcessor outputProcessor;
    try {
        for (;;) {
            Brn propName = parser.Next(' ');
            if (propName.Bytes() == 0) {
                // processed entire update
                break;
            }
            (void)parser.Next(Lpec::kArgumentDelimiter);
            Brn propVal = parser.Next(Lpec::kArgumentDelimiter);
            processor->EventUpdate(propName, propVal, outputProcessor);
        }
        processor->EventUpdateEnd();
    }
    catch (AsciiError&) {
        LOG2(kLpec, kError, "LPEC: Invalid evented update - ");
        LOG2(kLpec, kError, aUpdate);
        LOG2(kLpec, kError, "\n");
        processor->EventUpdateError();
    }
    subscription->Unlock();
    subscription->RemoveRef();
}