/******************************************************************************
* Copyright (C) 2015 Felix Rohrbach <kde@fxrh.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "../logging.h"
#include "requestdata.h"
#include <QtCore/QObject>
#include <QtCore/QUrlQuery>
// Any job that parses the response will need the below two.
#include <QtCore/QJsonDocument>
#include <QtCore/QJsonObject>
class QNetworkReply;
class QSslError;
namespace QMatrixClient
{
class ConnectionData;
enum class HttpVerb { Get, Put, Post, Delete };
struct JobTimeoutConfig
{
int jobTimeout;
int nextRetryInterval;
};
class BaseJob: public QObject
{
Q_OBJECT
Q_PROPERTY(int maxRetries READ maxRetries WRITE setMaxRetries)
public:
/* Just in case, the values are compatible with KJob
* (which BaseJob used to inherit from). */
enum StatusCode { NoError = 0 // To be compatible with Qt conventions
, Success = 0
, Pending = 1
, Abandoned = 50 //< A very brief period between abandoning and object deletion
, ErrorLevel = 100 //< Errors have codes starting from this
, NetworkError = 100
, JsonParseError
, TimeoutError
, ContentAccessError
, NotFoundError
, IncorrectRequestError
, IncorrectResponseError
, TooManyRequestsError
, UserDefinedError = 200
};
/**
* A simple wrapper around QUrlQuery that allows its creation from
* a list of string pairs
*/
class Query : public QUrlQuery
{
public:
using QUrlQuery::QUrlQuery;
Query() = default;
Query(const std::initializer_list< QPair<QString, QString> >& l)
{
setQueryItems(l);
}
};
using Data = RequestData;
/**
* This structure stores the status of a server call job. The status consists
* of a code, that is described (but not delimited) by the respective enum,
* and a freeform message.
*
* To extend the list of error codes, define an (anonymous) enum
* along the lines of StatusCode, with additional values
* starting at UserDefinedError
*/
class Status
{
public:
Status(StatusCode c) : code(c) { }
Status(int c, QString m) : code(c), message(std::move(m)) { }
bool good() const { return code < ErrorLevel; }
friend QDebug operator<<(QDebug dbg, const Status& s)
{
QDebugStateSaver _s(dbg);
return dbg.noquote().nospace()
<< s.code << ": " << s.message;
}
int code;
QString message;
};
using duration_t = int; // milliseconds
public:
BaseJob(HttpVerb verb, const QString& name, const QString& endpoint,
bool needsToken = true);
BaseJob(HttpVerb verb, const QString& name, const QString& endpoint,
const Query& query, Data&& data = {},
bool needsToken = true);
Status status() const;
int error() const;
virtual QString errorString() const;
int maxRetries() const;
void setMaxRetries(int newMaxRetries);
Q_INVOKABLE duration_t getCurrentTimeout() const;
Q_INVOKABLE duration_t getNextRetryInterval() const;
Q_INVOKABLE duration_t millisToRetry() const;
friend QDebug operator<<(QDebug dbg, const BaseJob* j)
{
return dbg << j->objectName();
}
public slots:
void start(const ConnectionData* connData);
/**
* Abandons the result of this job, arrived or unarrived.
*
* This aborts waiting for a reply from the server (if there was
* any pending) and deletes the job object. It is always done quietly
* (as opposed to KJob::kill() that can trigger emitting the result).
*/
void abandon();
signals:
/** The job is about to send a network request */
void aboutToStart();
/** The job has sent a network request */
void started();
/**
* The previous network request has failed; the next attempt will
* be done in the specified time
* @param nextAttempt the 1-based number of attempt (will always be more than 1)
* @param inMilliseconds the interval after which the next attempt will be taken
*/
void retryScheduled(int nextAttempt, int inMilliseconds);
/**
* Emitted when the job is finished, in any case. It is used to notify
* observers that the job is terminated and that progress can be hidden.
*
* This should not be emitted directly by subclasses;
* use finishJob() instead.
*
* In general, to be notified of a job's completion, client code
* should connect to success() and failure()
* rather than finished(), so that kill() is indeed quiet.
* However if you store a list of jobs and they might get killed
* silently, then you must connect to this instead of result(),
* to avoid dangling pointers in your list.
*
* @param job the job that emitted this signal
*
* @see success, failure
*/
void finished(BaseJob* job);
/**
* Emitted when the job is finished (except when killed).
*
* Use error() to know if the job was finished with error.
*
* @param job the job that emitted this signal
*
* @see success, failure
*/
void result(BaseJob* job);
/**
* Emitted together with result() but only if there's no error.
*/
void success(BaseJob*);
/**
* Emitted together with result() if there's an error.
* Same as result(), this won't be emitted in case of kill().
*/
void failure(BaseJob*);
void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
void uploadProgress(qint64 bytesSent, qint64 bytesTotal);
protected:
using headers_t = QHash<QByteArray, QByteArray>;
const QString& apiEndpoint() const;
void setApiEndpoint(const QString& apiEndpoint);
const headers_t& requestHeaders() const;
void setRequestHeader(const headers_t::key_type& headerName,
const headers_t::mapped_type& headerValue);
void setRequestHeaders(const headers_t& headers);
const QUrlQuery& query() const;
void setRequestQuery(const QUrlQuery& query);
const Data& requestData() const;
void setRequestData(Data&& data);
const QByteArrayList& expectedContentTypes() const;
void addExpectedContentType(const QByteArray& contentType);
void setExpectedContentTypes(const QByteArrayList& contentTypes);
/** Construct a URL out of baseUrl, path and query
* The function automatically adds '/' between baseUrl's path and
* \p path if necessary. The query component of \p baseUrl
* is ignored.
*/
static QUrl makeRequestUrl(QUrl baseUrl, const QString& path,
const QUrlQuery& query = {});
virtual void beforeStart(const ConnectionData* connData);
virtual void afterStart(const ConnectionData* connData,
QNetworkReply* reply);
virtual void beforeAbandon(QNetworkReply*);
/**
* Used by gotReply() to check the received reply for general
* issues such as network errors or access denial.
* Returning anything except NoError/Success prevents
* further parseReply()/parseJson() invocation.
*
* @param reply the reply received from the server
* @return the result of checking the reply
*
* @see gotReply
*/
virtual Status doCheckReply(QNetworkReply* reply) const;
/**
* Processes the reply. By default, parses the reply into
* a QJsonDocument and calls parseJson() if it's a valid JSON.
*
* @param reply raw contents of a HTTP reply from the server (without headers)
*
* @see gotReply, parseJson
*/
virtual Status parseReply(QNetworkReply* reply);
/**
* Processes the JSON document received from the Matrix server.
* By default returns succesful status without analysing the JSON.
*
* @param json valid JSON document received from the server
*
* @see parseReply
*/
virtual Status parseJson(const QJsonDocument&);
void setStatus(Status s);
void setStatus(int code, QString message);
// Q_DECLARE_LOGGING_CATEGORY return different function types
// in different versions
using LoggingCategory = decltype(JOBS)*;
void setLoggingCategory(LoggingCategory lcf);
// Job objects should only be deleted via QObject::deleteLater
~BaseJob() override;
protected slots:
void timeout();
private slots:
void sendRequest();
void checkReply();
void gotReply();
private:
void stop();
void finishJob();
class Private;
QScopedPointer<Private> d;
};
inline bool isJobRunning(BaseJob* job)
{
return job && job->error() == BaseJob::Pending;
}
} // namespace QMatrixClient