Upload: asynchronious operations

Implements https://github.com/owncloud/core/pull/31851

src/common/syncjournaldb.h

@@ -111,9 +111,9 @@ public:
 
     struct PollInfo
     {
-        QString _file;
-        QString _url;
-        qint64 _modtime;
+        QString _file; // The relative path of a file
+        QString _url; // the poll url. (This pollinfo is invalid if _url is empty)
+        qint64 _modtime; // The modtime of the file being uploaded
     };
 
     DownloadInfo getDownloadInfo(const QString &file);

src/libsync/owncloudpropagator.cpp

@@ -1005,13 +1005,12 @@ void CleanupPollsJob::start()
 
     auto info = _pollInfos.first();
     _pollInfos.pop_front();
-    SyncJournalFileRecord record;
-    if (_journal->getFileRecord(info._file, &record) && record.isValid()) {
-        SyncFileItemPtr item = SyncFileItem::fromSyncJournalFileRecord(record);
-        auto *job = new PollJob(_account, info._url, item, _journal, _localPath, this);
-        connect(job, &PollJob::finishedSignal, this, &CleanupPollsJob::slotPollFinished);
-        job->start();
-    }
+    SyncFileItemPtr item(new SyncFileItem);
+    item->_file = info._file;
+    item->_modtime = info._modtime;
+    auto *job = new PollJob(_account, info._url, item, _journal, _localPath, this);
+    connect(job, &PollJob::finishedSignal, this, &CleanupPollsJob::slotPollFinished);
+    job->start();
 }
 
 void CleanupPollsJob::slotPollFinished()
@@ -1033,7 +1032,7 @@ void CleanupPollsJob::slotPollFinished()
             deleteLater();
             return;
         }
-        // TODO: Is syncfilestatustracker notified somehow?
+        _journal->setUploadInfo(job->_item->_file, SyncJournalDb::UploadInfo());
     }
     // Continue with the next entry, or finish
     start();

src/libsync/propagateupload.cpp

@@ -104,7 +104,7 @@ void PollJob::start()
     QUrl finalUrl = QUrl::fromUserInput(accountUrl.scheme() + QLatin1String("://") + accountUrl.authority()
         + (path().startsWith('/') ? QLatin1String("") : QLatin1String("/")) + path());
     sendRequest("GET", finalUrl);
-    connect(reply(), &QNetworkReply::downloadProgress, this, &AbstractNetworkJob::resetTimeout);
+    connect(reply(), &QNetworkReply::downloadProgress, this, &AbstractNetworkJob::resetTimeout, Qt::UniqueConnection);
     AbstractNetworkJob::start();
 }
 
@@ -129,14 +129,14 @@ bool PollJob::finished()
             emit finishedSignal();
             return true;
         }
-        start();
+        QTimer::singleShot(8 * 1000, this, &PollJob::start);
         return false;
     }
 
     QByteArray jsonData = reply()->readAll().trimmed();
-    qCInfo(lcPollJob) << ">" << jsonData << "<" << reply()->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
     QJsonParseError jsonParseError;
-    QJsonObject status = QJsonDocument::fromJson(jsonData, &jsonParseError).object();
+    QJsonObject json = QJsonDocument::fromJson(jsonData, &jsonParseError).object();
+    qCInfo(lcPollJob) << ">" << jsonData << "<" << reply()->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() << json << jsonParseError.errorString();
     if (jsonParseError.error != QJsonParseError::NoError) {
         _item->_errorString = tr("Invalid JSON reply from the poll URL");
         _item->_status = SyncFileItem::NormalError;
@@ -144,16 +144,23 @@ bool PollJob::finished()
         return true;
     }
 
-    if (status["unfinished"].toBool()) {
-        start();
+    auto status = json["status"].toString();
+    if (status == QLatin1String("init") || status == QLatin1String("started")) {
+        QTimer::singleShot(5 * 1000, this, &PollJob::start);
         return false;
     }
 
-    _item->_errorString = status["error"].toString();
-    _item->_status = _item->_errorString.isEmpty() ? SyncFileItem::Success : SyncFileItem::NormalError;
-    _item->_fileId = status["fileid"].toString().toUtf8();
-    _item->_etag = status["etag"].toString().toUtf8();
     _item->_responseTimeStamp = responseTimestamp();
+    _item->_httpErrorCode = json["errorCode"].toInt();
+
+    if (status == QLatin1String("finished")) {
+        _item->_status = SyncFileItem::Success;
+        _item->_fileId = json["fileId"].toString().toUtf8();
+        _item->_etag = parseEtag(json["ETag"].toString().toUtf8());
+    } else { // error
+        _item->_status = classifyError(QNetworkReply::UnknownContentError, _item->_httpErrorCode);
+        _item->_errorString = json["errorMessage"].toString();
+    }
 
     SyncJournalDb::PollInfo info;
     info._file = _item->_file;
@@ -705,9 +712,10 @@ void PropagateUploadFileCommon::abortWithError(SyncFileItem::Status status, cons
 QMap<QByteArray, QByteArray> PropagateUploadFileCommon::headers()
 {
     QMap<QByteArray, QByteArray> headers;
-    headers[QByteArrayLiteral("OC-Async")] = QByteArrayLiteral("1");
     headers[QByteArrayLiteral("Content-Type")] = QByteArrayLiteral("application/octet-stream");
     headers[QByteArrayLiteral("X-OC-Mtime")] = QByteArray::number(qint64(_item->_modtime));
+    if (qEnvironmentVariableIntValue("OWNCLOUD_LAZYOPS"))
+        headers[QByteArrayLiteral("OC-LazyOps")] = QByteArrayLiteral("true");
 
     if (_item->_file.contains(QLatin1String(".sys.admin#recall#"))) {
         // This is a file recall triggered by the admin.  Note: the

src/libsync/propagateupload.h

@@ -152,8 +152,8 @@ signals:
 /**
  * @brief This job implements the asynchronous PUT
  *
- * If the server replies to a PUT with a OC-Finish-Poll url, we will query this url until the server
- * replies with an etag. https://github.com/owncloud/core/issues/12097
+ * If the server replies to a PUT with a OC-JobStatus-Location path, we will query this url until the server
+ * replies with an etag.
  * @ingroup libsync
  */
 class PollJob : public AbstractNetworkJob
@@ -310,7 +310,7 @@ protected:
      */
     static void adjustLastJobTimeout(AbstractNetworkJob *job, qint64 fileSize);
 
-    // Bases headers that need to be sent with every chunk
+    /** Bases headers that need to be sent on the PUT, or in the MOVE for chunking-ng */
     QMap<QByteArray, QByteArray> headers();
 private:
   PropagateUploadEncrypted *_uploadEncryptedHelper;

src/libsync/propagateuploadng.cpp

@@ -459,6 +459,18 @@ void PropagateUploadFileNG::slotMoveJobFinished()
         commonErrorHandling(job);
         return;
     }
+
+    if (_item->_httpErrorCode == 202) {
+        QString path = QString::fromUtf8(job->reply()->rawHeader("OC-JobStatus-Location"));
+        if (path.isEmpty()) {
+            done(SyncFileItem::NormalError, tr("Poll URL missing"));
+            return;
+        }
+        _finished = true;
+        startPollJob(path);
+        return;
+    }
+
     if (_item->_httpErrorCode != 201 && _item->_httpErrorCode != 204) {
         abortWithError(SyncFileItem::NormalError, tr("Unexpected return code from server (%1)").arg(_item->_httpErrorCode));
         return;

src/libsync/propagateuploadv1.cpp

@@ -211,7 +211,7 @@ void PropagateUploadFileV1::slotPutFinished()
 
     // The server needs some time to process the request and provide us with a poll URL
     if (_item->_httpErrorCode == 202) {
-        QString path = QString::fromUtf8(job->reply()->rawHeader("OC-Finish-Poll"));
+        QString path = QString::fromUtf8(job->reply()->rawHeader("OC-JobStatus-Location"));
         if (path.isEmpty()) {
             done(SyncFileItem::NormalError, tr("Poll URL missing"));
             return;

test/CMakeLists.txt

@@ -52,6 +52,7 @@ nextcloud_add_test(SyncConflict "syncenginetestutils.h")
 nextcloud_add_test(SyncFileStatusTracker "syncenginetestutils.h")
 nextcloud_add_test(Download "syncenginetestutils.h")
 nextcloud_add_test(ChunkingNg "syncenginetestutils.h")
+nextcloud_add_test(AsyncOp "syncenginetestutils.h")
 nextcloud_add_test(UploadReset "syncenginetestutils.h")
 nextcloud_add_test(AllFilesDeleted "syncenginetestutils.h")
 nextcloud_add_test(Blacklist "syncenginetestutils.h")

test/syncenginetestutils.h

@@ -46,7 +46,7 @@ inline QString getFilePathFromUrl(const QUrl &url) {
 
 
 inline QString generateEtag() {
-    return QString::number(QDateTime::currentDateTimeUtc().toMSecsSinceEpoch(), 16);
+    return QString::number(QDateTime::currentDateTimeUtc().toMSecsSinceEpoch(), 16) + QByteArray::number(qrand(), 16);
 }
 inline QByteArray generateFileId() {
     return QByteArray::number(qrand(), 16);
@@ -240,7 +240,7 @@ public:
             auto file = it->find(std::move(pathComponents).subComponents(), invalidateEtags);
             if (file && invalidateEtags) {
                 // Update parents on the way back
-                etag = file->etag;
+                etag = generateEtag();
             }
             return file;
         }
@@ -310,7 +310,6 @@ public:
     QMap<QString, FileInfo> children;
     QString parentPath;
 
-private:
     FileInfo *findInvalidatingEtags(PathComponents pathComponents) {
         return find(std::move(pathComponents), true);
     }
@@ -432,24 +431,25 @@ public:
         setUrl(request.url());
         setOperation(op);
         open(QIODevice::ReadOnly);
+        fileInfo = perform(remoteRootFileInfo, request, putPayload);
+        QMetaObject::invokeMethod(this, "respond", Qt::QueuedConnection);
+    }
 
+    static FileInfo *perform(FileInfo &remoteRootFileInfo, const QNetworkRequest &request, const QByteArray &putPayload)
+    {
         QString fileName = getFilePathFromUrl(request.url());
         Q_ASSERT(!fileName.isEmpty());
-        if ((fileInfo = remoteRootFileInfo.find(fileName))) {
+        FileInfo *fileInfo = remoteRootFileInfo.find(fileName);
+        if (fileInfo) {
             fileInfo->size = putPayload.size();
             fileInfo->contentChar = putPayload.at(0);
         } else {
             // Assume that the file is filled with the same character
             fileInfo = remoteRootFileInfo.create(fileName, putPayload.size(), putPayload.at(0));
         }
-
-        if (!fileInfo) {
-            abort();
-            return;
-        }
         fileInfo->lastModified = OCC::Utility::qDateTimeFromTime_t(request.rawHeader("X-OC-Mtime").toLongLong());
         remoteRootFileInfo.find(fileName, /*invalidateEtags=*/true);
-        QMetaObject::invokeMethod(this, "respond", Qt::QueuedConnection);
+        return fileInfo;
     }
 
     Q_INVOKABLE virtual void respond()
@@ -639,7 +639,16 @@ public:
         setUrl(request.url());
         setOperation(op);
         open(QIODevice::ReadOnly);
+        fileInfo = perform(uploadsFileInfo, remoteRootFileInfo, request);
+        if (!fileInfo) {
+            QTimer::singleShot(0, this, &FakeChunkMoveReply::respondPreconditionFailed);
+        } else {
+            QTimer::singleShot(0, this, &FakeChunkMoveReply::respond);
+        }
+    }
 
+    static FileInfo *perform(FileInfo &uploadsFileInfo, FileInfo &remoteRootFileInfo, const QNetworkRequest &request)
+    {
         QString source = getFilePathFromUrl(request.url());
         Q_ASSERT(!source.isEmpty());
         Q_ASSERT(source.endsWith("/.file"));
@@ -665,17 +674,17 @@ public:
         } while(true);
 
         Q_ASSERT(count > 1); // There should be at least two chunks, otherwise why would we use chunking?
-        QCOMPARE(sourceFolder->children.count(), count); // There should not be holes or extra files
+        Q_ASSERT(sourceFolder->children.count() == count); // There should not be holes or extra files
 
         QString fileName = getFilePathFromUrl(QUrl::fromEncoded(request.rawHeader("Destination")));
         Q_ASSERT(!fileName.isEmpty());
 
-        if ((fileInfo = remoteRootFileInfo.find(fileName))) {
-            QVERIFY(request.hasRawHeader("If")); // The client should put this header
+        FileInfo *fileInfo = remoteRootFileInfo.find(fileName);
+        if (fileInfo) {
+            Q_ASSERT(request.hasRawHeader("If")); // The client should put this header
             if (request.rawHeader("If") != QByteArray("<" + request.rawHeader("Destination") +
                                                 "> ([\"" + fileInfo->etag.toLatin1() + "\"])")) {
-                QMetaObject::invokeMethod(this, "respondPreconditionFailed", Qt::QueuedConnection);
-                return;
+                return nullptr;
             }
             fileInfo->size = size;
             fileInfo->contentChar = payload;
@@ -685,14 +694,10 @@ public:
             fileInfo = remoteRootFileInfo.create(fileName, size, payload);
         }
 
-        if (!fileInfo) {
-            abort();
-            return;
-        }
         fileInfo->lastModified = OCC::Utility::qDateTimeFromTime_t(request.rawHeader("X-OC-Mtime").toLongLong());
         remoteRootFileInfo.find(fileName, /*invalidateEtags=*/true);
 
-        QTimer::singleShot(0, this, &FakeChunkMoveReply::respond);
+        return fileInfo;
     }
 
     Q_INVOKABLE virtual void respond()
@@ -722,6 +727,48 @@ public:
 };
 
 
+class FakePayloadReply : public QNetworkReply
+{
+    Q_OBJECT
+public:
+    FakePayloadReply(QNetworkAccessManager::Operation op, const QNetworkRequest &request,
+        const QByteArray &body, QObject *parent)
+        : QNetworkReply{ parent }
+        , _body(body)
+    {
+        setRequest(request);
+        setUrl(request.url());
+        setOperation(op);
+        open(QIODevice::ReadOnly);
+        QTimer::singleShot(10, this, &FakePayloadReply::respond);
+    }
+
+    void respond()
+    {
+        setAttribute(QNetworkRequest::HttpStatusCodeAttribute, 200);
+        setHeader(QNetworkRequest::ContentLengthHeader, _body.size());
+        emit metaDataChanged();
+        emit readyRead();
+        setFinished(true);
+        emit finished();
+    }
+
+    void abort() override {}
+    qint64 readData(char *buf, qint64 max) override
+    {
+        max = qMin<qint64>(max, _body.size());
+        memcpy(buf, _body.constData(), max);
+        _body = _body.mid(max);
+        return max;
+    }
+    qint64 bytesAvailable() const override
+    {
+        return _body.size();
+    }
+    QByteArray _body;
+};
+
+
 class FakeErrorReply : public QNetworkReply
 {
     Q_OBJECT

test/testasyncop.cpp

@@ -0,0 +1,236 @@
+/*
+ *    This software is in the public domain, furnished "as is", without technical
+ *    support, and with no warranty, express or implied, as to its usefulness for
+ *    any purpose.
+ *
+ */
+
+#include <QtTest>
+#include "syncenginetestutils.h"
+#include <syncengine.h>
+
+using namespace OCC;
+
+class FakeAsyncReply : public QNetworkReply
+{
+    Q_OBJECT
+    QByteArray _pollLocation;
+
+public:
+    FakeAsyncReply(const QByteArray &pollLocation, QNetworkAccessManager::Operation op, const QNetworkRequest &request, QObject *parent)
+        : QNetworkReply{ parent }
+        , _pollLocation(pollLocation)
+    {
+        setRequest(request);
+        setUrl(request.url());
+        setOperation(op);
+        open(QIODevice::ReadOnly);
+
+        QMetaObject::invokeMethod(this, "respond", Qt::QueuedConnection);
+    }
+
+    Q_INVOKABLE void respond()
+    {
+        setAttribute(QNetworkRequest::HttpStatusCodeAttribute, 202);
+        setRawHeader("OC-JobStatus-Location", _pollLocation);
+        emit metaDataChanged();
+        emit finished();
+    }
+
+    void abort() override {}
+    qint64 readData(char *, qint64) override { return 0; }
+};
+
+
+class TestAsyncOp : public QObject
+{
+    Q_OBJECT
+
+private slots:
+
+    void asyncUploadOperations()
+    {
+        FakeFolder fakeFolder{ FileInfo::A12_B12_C12_S12() };
+        fakeFolder.syncEngine().account()->setCapabilities({ { "dav", QVariantMap{ { "chunking", "1.0" } } } });
+        // Reduce max chunk size a bit so we get more chunks
+        SyncOptions options;
+        options._maxChunkSize = 20 * 1000;
+        fakeFolder.syncEngine().setSyncOptions(options);
+        int nGET = 0;
+
+        // This test is made of several testcases.
+        // the testCases maps a filename to a couple of callback.
+        // When a file is uploaded, the fake server will always return the 202 code, and will set
+        // the `perform` functor to what needs to be done to complete the transaction.
+        // The testcase consist of the `pollRequest` which will be called when the sync engine
+        // calls the poll url.
+        struct TestCase
+        {
+            using PollRequest_t = std::function<QNetworkReply *(TestCase *, const QNetworkRequest &request)>;
+            PollRequest_t pollRequest;
+            std::function<FileInfo *()> perform = nullptr;
+        };
+        QHash<QString, TestCase> testCases;
+
+        fakeFolder.setServerOverride([&](QNetworkAccessManager::Operation op, const QNetworkRequest &request, QIODevice *outgoingData) -> QNetworkReply * {
+            auto path = request.url().path();
+
+            if (op == QNetworkAccessManager::GetOperation && path.startsWith("/async-poll/")) {
+                auto file = path.mid(sizeof("/async-poll/") - 1);
+                Q_ASSERT(testCases.contains(file));
+                auto &testCase = testCases[file];
+                return testCase.pollRequest(&testCase, request);
+            }
+
+            if (op == QNetworkAccessManager::PutOperation && !path.contains("/uploads/")) {
+                // Not chunking
+                auto file = getFilePathFromUrl(request.url());
+                Q_ASSERT(testCases.contains(file));
+                auto &testCase = testCases[file];
+                Q_ASSERT(!testCase.perform);
+                auto putPayload = outgoingData->readAll();
+                testCase.perform = [putPayload, request, &fakeFolder] {
+                    return FakePutReply::perform(fakeFolder.remoteModifier(), request, putPayload);
+                };
+                return new FakeAsyncReply("/async-poll/" + file.toUtf8(), op, request, &fakeFolder.syncEngine());
+            } else if (request.attribute(QNetworkRequest::CustomVerbAttribute) == "MOVE") {
+                QString file = getFilePathFromUrl(QUrl::fromEncoded(request.rawHeader("Destination")));
+                Q_ASSERT(testCases.contains(file));
+                auto &testCase = testCases[file];
+                Q_ASSERT(!testCase.perform);
+                testCase.perform = [request, &fakeFolder] {
+                    return FakeChunkMoveReply::perform(fakeFolder.uploadState(), fakeFolder.remoteModifier(), request);
+                };
+                return new FakeAsyncReply("/async-poll/" + file.toUtf8(), op, request, &fakeFolder.syncEngine());
+            } else if (op == QNetworkAccessManager::GetOperation) {
+                nGET++;
+            }
+            return nullptr;
+        });
+
+
+        // Callback to be used to finalize the transaction and return the success
+        auto successCallback = [](TestCase *tc, const QNetworkRequest &request) {
+            tc->pollRequest = [](auto...) -> QNetworkReply * { std::abort(); }; // shall no longer be called
+            FileInfo *info = tc->perform();
+            QByteArray body = "{ \"status\":\"finished\", \"ETag\":\"\\\"" + info->etag.toUtf8() + "\\\"\", \"fileId\":\"" + info->fileId + "\"}\n";
+            return new FakePayloadReply(QNetworkAccessManager::GetOperation, request, body, nullptr);
+        };
+        // Callback that never finishes
+        auto waitForeverCallback = [](TestCase *, const QNetworkRequest &request) {
+            QByteArray body = "{\"status\":\"started\"}\n";
+            return new FakePayloadReply(QNetworkAccessManager::GetOperation, request, body, nullptr);
+        };
+        // Callback that simulate an error.
+        auto errorCallback = [](TestCase *tc, const QNetworkRequest &request) {
+            tc->pollRequest = [](auto...) -> QNetworkReply * { std::abort(); }; // shall no longer be called;
+            QByteArray body = "{\"status\":\"error\",\"errorCode\":500,\"errorMessage\":\"TestingErrors\"}\n";
+            return new FakePayloadReply(QNetworkAccessManager::GetOperation, request, body, nullptr);
+        };
+        // This lambda takes another functor as a parameter, and returns a callback that will
+        // tell the client needs to poll again, and further call to the poll url will call the
+        // given callback
+        auto waitAndChain = [](const TestCase::PollRequest_t &chain) {
+            return [chain](TestCase *tc, const QNetworkRequest &request) {
+                tc->pollRequest = chain;
+                QByteArray body = "{\"status\":\"started\"}\n";
+                return new FakePayloadReply(QNetworkAccessManager::GetOperation, request, body, nullptr);
+            };
+        };
+
+        // Create a testcase by creating a file of a given size locally and assigning it a callback
+        auto insertFile = [&](const QString &file, int size, TestCase::PollRequest_t cb) {
+            fakeFolder.localModifier().insert(file, size);
+            testCases[file] = { std::move(cb) };
+        };
+        fakeFolder.localModifier().mkdir("success");
+        insertFile("success/chunked_success", options._maxChunkSize * 3, successCallback);
+        insertFile("success/single_success", 300, successCallback);
+        insertFile("success/chunked_patience", options._maxChunkSize * 3,
+            waitAndChain(waitAndChain(successCallback)));
+        insertFile("success/single_patience", 300,
+            waitAndChain(waitAndChain(successCallback)));
+        fakeFolder.localModifier().mkdir("err");
+        insertFile("err/chunked_error", options._maxChunkSize * 3, errorCallback);
+        insertFile("err/single_error", 300, errorCallback);
+        insertFile("err/chunked_error2", options._maxChunkSize * 3, waitAndChain(errorCallback));
+        insertFile("err/single_error2", 300, waitAndChain(errorCallback));
+
+        // First sync should finish by itself.
+        // All the things in "success/" should be transfered, the things in "err/" not
+        QVERIFY(!fakeFolder.syncOnce());
+        QCOMPARE(nGET, 0);
+        QCOMPARE(*fakeFolder.currentLocalState().find("success"),
+            *fakeFolder.currentRemoteState().find("success"));
+        testCases.clear();
+        testCases["err/chunked_error"] = { successCallback };
+        testCases["err/chunked_error2"] = { successCallback };
+        testCases["err/single_error"] = { successCallback };
+        testCases["err/single_error2"] = { successCallback };
+
+        fakeFolder.localModifier().mkdir("waiting");
+        insertFile("waiting/small", 300, waitForeverCallback);
+        insertFile("waiting/willNotConflict", 300, waitForeverCallback);
+        insertFile("waiting/big", options._maxChunkSize * 3,
+            waitAndChain(waitAndChain([&](TestCase *tc, const QNetworkRequest &request) {
+                QTimer::singleShot(0, &fakeFolder.syncEngine(), &SyncEngine::abort);
+                return waitAndChain(waitForeverCallback)(tc, request);
+            })));
+
+        fakeFolder.syncJournal().wipeErrorBlacklist();
+
+        // This second sync will redo the files that had errors
+        // But the waiting folder will not complete before it is aborted.
+        QVERIFY(!fakeFolder.syncOnce());
+        QCOMPARE(nGET, 0);
+        QCOMPARE(*fakeFolder.currentLocalState().find("err"),
+            *fakeFolder.currentRemoteState().find("err"));
+
+        testCases["waiting/small"].pollRequest = waitAndChain(waitAndChain(successCallback));
+        testCases["waiting/big"].pollRequest = waitAndChain(successCallback);
+        testCases["waiting/willNotConflict"].pollRequest =
+            [&fakeFolder, &successCallback](TestCase *tc, const QNetworkRequest &request) {
+                auto &remoteModifier = fakeFolder.remoteModifier(); // successCallback destroys the capture
+                auto reply = successCallback(tc, request);
+                // This is going to succeed, and after we just change the file.
+                // This should not be a conflict, but this should be downloaded in the
+                // next sync
+                remoteModifier.appendByte("waiting/willNotConflict");
+                return reply;
+            };
+
+
+        int nPUT = 0;
+        int nMOVE = 0;
+        int nDELETE = 0;
+        fakeFolder.setServerOverride([&](QNetworkAccessManager::Operation op, const QNetworkRequest &request, QIODevice *) -> QNetworkReply * {
+            auto path = request.url().path();
+            if (op == QNetworkAccessManager::GetOperation && path.startsWith("/async-poll/")) {
+                auto file = path.mid(sizeof("/async-poll/") - 1);
+                Q_ASSERT(testCases.contains(file));
+                auto &testCase = testCases[file];
+                return testCase.pollRequest(&testCase, request);
+            } else if (op == QNetworkAccessManager::PutOperation) {
+                nPUT++;
+            } else if (op == QNetworkAccessManager::GetOperation) {
+                nGET++;
+            } else if (op == QNetworkAccessManager::DeleteOperation) {
+                nDELETE++;
+            } else if (request.attribute(QNetworkRequest::CustomVerbAttribute) == "MOVE") {
+                nMOVE++;
+            }
+            return nullptr;
+        });
+
+        // This last sync will do the waiting stuff
+        QVERIFY(fakeFolder.syncOnce());
+        QCOMPARE(nGET, 1); // "waiting/willNotConflict"
+        QCOMPARE(nPUT, 0);
+        QCOMPARE(nMOVE, 0);
+        QCOMPARE(nDELETE, 0);
+        QCOMPARE(fakeFolder.currentLocalState(), fakeFolder.currentRemoteState());
+    }
+};
+
+QTEST_GUILESS_MAIN(TestAsyncOp)
+#include "testasyncop.moc"