outboxqueue.cpp
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outboxqueue.cpp
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	/*
	Copyright (c) 2009 Constantin Berzan <exit3219@gmail.com>

	This library is free software; you can redistribute it and/or modify it
	under the terms of the GNU Library General Public License as published by
	the Free Software Foundation; either version 2 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 Library General Public
	License for more details.

	You should have received a copy of the GNU Library General Public License
	along with this library; see the file COPYING.LIB. If not, write to the
	Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301, USA.
	*/

	#include "outboxqueue.h"

	#include <KDebug>

	#include <Akonadi/Attribute>
	#include <Akonadi/Item>
	#include <Akonadi/ItemFetchJob>
	#include <Akonadi/ItemFetchScope>
	#include <Akonadi/Monitor>

	#include <kmime/kmime_message.h>
	#include <boost/shared_ptr.hpp>

	#include <outboxinterface/localfolders.h>
	#include <outboxinterface/addressattribute.h>
	#include <outboxinterface/dispatchmodeattribute.h>
	#include <outboxinterface/sentcollectionattribute.h>
	#include <outboxinterface/transportattribute.h>

	using namespace Akonadi;
	using namespace OutboxInterface;


	/**
	* @internal
	*/
	class OutboxQueue::Private
	{
	public:
	Private( OutboxQueue *qq )
	: q( qq )
	, outbox( -1 )
	{
	}


	OutboxQueue *const q;

	Collection outbox;
	Monitor *monitor;
	QList<Item> queue;

	#if 0
	// If an item is modified externally between the moment we pass it to
	// the MDA and the time the MDA marks it as sent, then we will get
	// itemChanged() and may mistakenly re-add the item to the queue.
	// So we ignore the item that we pass to the MDA, until the MDA finishes
	// sending it.
	Item currentItem;
	#endif
	// HACK: The above is not enough.
	// Apparently change notifications are delayed sometimes (???)
	// and we re-add an item long after it was sent. So keep a list of sent
	// items.
	// TODO debug and figure out why this happens.
	QSet<Item::Id> ignore;

	void initQueue();
	void addIfComplete( const Item &item );

	// slots:
	void collectionFetched( KJob *job );
	void itemFetched( KJob *job );
	void outboxChanged();
	void itemAdded( const Item &item );
	void itemChanged( const Item &item );
	void itemMoved( const Item &item, const Collection &source, const Collection &dest );
	void itemRemoved( const Item &item );
	void itemProcessed( const Item &item, bool result );

	};


	void OutboxQueue::Private::initQueue()
	{
	queue.clear();

	kDebug() << "Fetching items in collection" << outbox.id();
	ItemFetchJob *job = new ItemFetchJob( outbox );
	job->fetchScope().fetchAllAttributes();
	job->fetchScope().fetchFullPayload( false );
	connect( job, SIGNAL( result( KJob* ) ), q, SLOT( collectionFetched( KJob* ) ) );
	}

	void OutboxQueue::Private::addIfComplete( const Item &item )
	{
	if( ignore.contains( item.id() ) ) {
	kDebug() << "Item" << item.id() << "is ignored.";
	return;
	}

	if( queue.contains( item ) ) {
	kDebug() << "Item" << item.id() << "already in queue!";
	return;
	}

	if( item.remoteId().isEmpty() ) {
	kDebug() << "Item" << item.id() << "has an empty remoteId.";
	// HACK:
	// This probably means that it hasn't yet been stored on disk by the
	// maildir resource, so I'll let it go for now, and process it when
	// it's ready.
	return;
	}

	if( !item.hasAttribute<AddressAttribute>() \|\|
	!item.hasAttribute<DispatchModeAttribute>() \|\|
	!item.hasAttribute<SentCollectionAttribute>() \|\|
	!item.hasAttribute<TransportAttribute>() ) {
	kWarning() << "Item" << item.id() << "does not have all required attributes.";
	return;
	}

	if( !item.hasFlag( "queued" ) ) {
	kDebug() << "Item" << item.id() << "has no 'queued' flag.";
	return;
	}

	const DispatchModeAttribute *mA = item.attribute<DispatchModeAttribute>();
	Q_ASSERT( mA );
	if( mA->dispatchMode() == DispatchModeAttribute::AfterDueDate &&
	mA->dueDate() > QDateTime::currentDateTime() ) {
	kDebug() << "Item" << item.id() << "is to be sent in the future.";
	return;

	// TODO: QTimer to check again on due date.
	}

	const TransportAttribute *tA = item.attribute<TransportAttribute>();
	Q_ASSERT( tA );
	if( tA->transport() == 0 ) {
	kWarning() << "Item" << item.id() << "has invalid transport.";
	return;
	}

	// This check requires fetchFullPayload. -> slow (?)
	/*
	if( !item.hasPayload<KMime::Message::Ptr>() ) {
	kWarning() << "Item" << item.id() << "does not have KMime::Message::Ptr payload.";
	return;
	}
	*/

	kDebug() << "Item" << item.id() << "is accepted into the queue.";
	Q_ASSERT( !queue.contains( item ) );
	queue.append( item );
	emit q->newItems();
	}

	void OutboxQueue::Private::collectionFetched( KJob *job )
	{
	if( job->error() ) {
	kWarning() << "Failed to fetch outbox collection. Queue will be empty until the outbox changes.";
	return;
	}

	ItemFetchJob fjob = dynamic_cast<ItemFetchJob>( job );
	Q_ASSERT( fjob );
	kDebug() << "Fetched" << fjob->items().count() << "items.";
	foreach( const Item &item, fjob->items() ) {
	addIfComplete( item );
	}
	}

	void OutboxQueue::Private::itemFetched( KJob *job )
	{
	if( job->error() ) {
	kDebug() << "Error fetching item:" << job->errorString() << ". Trying next item in queue.";
	q->fetchOne();
	}

	ItemFetchJob fjob = dynamic_cast<ItemFetchJob>( job );
	Q_ASSERT( fjob );
	if( fjob->items().count() != 1 ) {
	kDebug() << "Fetched" << fjob->items().count() << ", expected 1. Trying next item in queue.";
	q->fetchOne();
	}

	emit q->itemReady( fjob->items().first() );
	}

	void OutboxQueue::Private::outboxChanged()
	{
	// Called on startup, and whenever the local folders change.
	Collection col = LocalFolders::self()->outbox();
	Q_ASSERT( col.isValid() );
	if( col == outbox ) {
	return;
	}

	monitor->setCollectionMonitored( outbox, false );
	monitor->setCollectionMonitored( col, true );
	outbox = col;
	kDebug() << "Changed outbox to" << outbox.id();
	initQueue();
	}

	void OutboxQueue::Private::itemAdded( const Item &item )
	{
	addIfComplete( item );
	}

	void OutboxQueue::Private::itemChanged( const Item &item )
	{
	addIfComplete( item );
	// TODO: if the item is moved out of the outbox, will I get itemChanged?
	}

	void OutboxQueue::Private::itemMoved( const Item &item, const Collection &source, const Collection &dest )
	{
	if( source == outbox ) {
	queue.removeAll( item );
	} else if( dest == outbox ) {
	addIfComplete( item );
	}
	}

	void OutboxQueue::Private::itemRemoved( const Item &item )
	{
	queue.removeAll( item );
	}

	void OutboxQueue::Private::itemProcessed( const Item &item, bool result )
	{
	Q_ASSERT( ignore.contains( item.id() ) );
	if( !result ) {
	// Give the user a chance to re-send the item if it failed.
	ignore.remove( item.id() );
	}
	}



	OutboxQueue::OutboxQueue( QObject *parent )
	: QObject( parent )
	, d( new Private( this ) )
	{
	d->monitor = new Monitor( this );
	d->monitor->itemFetchScope().fetchAllAttributes();
	d->monitor->itemFetchScope().fetchFullPayload( false );
	connect( d->monitor, SIGNAL( itemAdded( Akonadi::Item, Akonadi::Collection ) ),
	this, SLOT( itemAdded( Akonadi::Item ) ) );
	connect( d->monitor, SIGNAL( itemChanged( Akonadi::Item, QSet<QByteArray> ) ),
	this, SLOT( itemChanged( Akonadi::Item ) ) );
	connect( d->monitor, SIGNAL( itemMoved( Akonadi::Item, Akonadi::Collection, Akonadi::Collection ) ),
	this, SLOT( itemMoved( Akonadi::Item, Akonadi::Collection, Akonadi::Collection ) ) );
	connect( d->monitor, SIGNAL( itemRemoved( Akonadi::Item ) ),
	this, SLOT( itemRemoved( Akonadi::Item ) ) );

	connect( LocalFolders::self(), SIGNAL( foldersReady() ),
	this, SLOT( outboxChanged() ) );
	LocalFolders::self()->fetch();
	}

	OutboxQueue::~OutboxQueue()
	{
	delete d;
	}

	bool OutboxQueue::isEmpty() const
	{
	return d->queue.isEmpty();
	}

	void OutboxQueue::fetchOne()
	{
	if( isEmpty() ) {
	kDebug() << "Empty queue.";
	return;
	}

	Item item = d->queue.takeFirst();
	Q_ASSERT( !d->ignore.contains( item.id() ) );
	d->ignore.insert( item.id() );

	ItemFetchJob *job = new ItemFetchJob( item );
	job->fetchScope().fetchAllAttributes();
	job->fetchScope().fetchFullPayload();
	connect( job, SIGNAL( result( KJob* ) ), this, SLOT( itemFetched( KJob* ) ) );
	}


	#include "outboxqueue.moc"

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