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This prepares the backend to enable timeouts/retry intervals configurable from clients.
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This is needed to support cases of content-repo, where the request/response bodies are not JSON.
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Closes #102.
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Having to pass ConnectionData to each and every job class was nothing but boilerplate since the very beginning. Removing it required to prepend BaseJob::start() with ConnectionData-setting code, and to provide a way to alter the request configuration depending on the (late-coming) ConnectionData object. This is a new responsibility of BaseJob::start(); the previous BaseJob::start() contents have moved to BaseJob::sendRequest() (which is now invoked on retries, instead of start()).
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We had a stupid situation when this class has less features when
compiled with newer Qt because we explicitly added a constructor from
std::initializer_list for older Qt versions but did not reuse the same
constructor from QJsonObject for newer versions.
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Also: Query and Data constructors from initialization_list<> are no more explicit, as clang-tidy recommends.
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Use std::initializer_list instead of QList<> because we actually want to construct from initializer lists; and only enable Data(std::initializer_list) for older Qt's that don't have the same on the level of QJsonObject.
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logging.h/logging.cpp is now a full-fledged pair for all things logging. Two more categories added, EPHEMERAL and SYNCJOB, that control logging for ephemeral events and SyncJob, respectively (in particular, switching off EPHEMERAL greatly reduces the logspam about moving read markers and how many users have read up to which event).
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Mainly it's about const-ification (in particular, passing const-refs instead of values) and deleting unneeded declarations/#includes. Since the changes alter the external interface, this is submitted as a PR for peer review.
One of unneeded declarations/definitions is a virtual destructor in BaseJob descendants. Since a job object should be deleted through QObject::deleteLater() anyway (and it's the only correct way of disposing of the object), all deletions will call the stack of destructors through virtual QObject::~QObject(). Therefore even BaseJob could get on with a non-virtual destructor but for the sake of clarity BaseJob::~BaseJob() is still declared virtual.
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As of now, the retry logic (see BaseJob::finishJob() method) invokes the same network request several times with increasing timeouts and retry intervals. Some additional signals and accessors are also provided to control the behaviour from inheriting classes (see a notable example with SyncJob in the same commit) and clients (support of retries in Quaternion comes in a respective commit shortly).
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This should help to provide more reasonable error messages when a particular resource is not found or entered data are outright incorrect.
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QJsonObject stock constructors are boring anyway - using QJsonObject::QJsonObject wasn't really necessary.
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data() in each job class
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return it
This better fixes the contract for derived job classes and simplifies error reporting. Methods error() and errorString() are kept for back-compatibility; status() returns a combination of them, conveniently packed into a Status object. For a quick status check, Status::good() is provided.
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BaseJob
1. The externally (for derived classes) visible additions are checkReply() and parseReply() virtual methods, with gotReply becoming a mere dispatcher (and therefore a private method). Splitting gotReply() in that way allowed to remove boilerplate code from MediaThumbnailJob.
2. The internal tweak is using QScopedPointer<> to store pointers both to the Private object and to a QNetworkReply (with a special deleter that aborts the reply before destructing the object). This allows to remove desperate attempts to call reply->abort() wherever it's no more needed (and not aborting the in-flight replies seems to be a/the culprit of Quaternion after-exit hangs).
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Some parts of the code were copied from the KCoreAddons sources - surprisingly few, in fact, mostly API with comments. With this commit, libqmatrixclient doesn't depend on KCoreAddons.
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well + stability fixes
1. Introduce ContentAccessDenied error code to BaseJob to allow clients to treat access denial errors differently from other network errors.
2. Since parseJson() overrides are responsible for calling emitResult(), the "default" BaseJob::parseJson() should call emitResult() as well.
3. Make sure BaseJob::fail() doesn't crash in absence of QNetworkReply.
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data()
Thanks to CLang model.
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And we don't need two log lines for timeouts.
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destruction of the job
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This is to facilitate processing of job results (see further commits).
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