mirror of https://github.com/aria2/aria2
275 lines
8.7 KiB
C++
275 lines
8.7 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "AbstractCommand.h"
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#include "DlAbortEx.h"
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#include "DlRetryEx.h"
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#include "InitiateConnectionCommandFactory.h"
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#include "Util.h"
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#include "message.h"
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#include "SleepCommand.h"
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#include "prefs.h"
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#include "DNSCache.h"
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#include "FatalException.h"
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AbstractCommand::AbstractCommand(int32_t cuid,
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const RequestHandle& req,
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RequestGroup* requestGroup,
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DownloadEngine* e,
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const SocketHandle& s):
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Command(cuid), req(req), _requestGroup(requestGroup), e(e), socket(s),
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checkSocketIsReadable(false), checkSocketIsWritable(false),
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nameResolverCheck(false) {
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setReadCheckSocket(socket);
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timeout = this->e->option->getAsInt(PREF_TIMEOUT);
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++_requestGroup->numConnection;
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}
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AbstractCommand::~AbstractCommand() {
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disableReadCheckSocket();
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disableWriteCheckSocket();
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--_requestGroup->numConnection;
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}
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bool AbstractCommand::execute() {
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try {
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if(_requestGroup->getSegmentMan()->finished()) {
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//logger->debug("CUID#%d - finished.", cuid);
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return true;
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}
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PeerStatHandle peerStat = _requestGroup->getSegmentMan()->getPeerStat(cuid);
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if(peerStat.get()) {
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if(peerStat->getStatus() == PeerStat::REQUEST_IDLE) {
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logger->info(MSG_ABORT_REQUESTED, cuid);
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onAbort(0);
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req->resetUrl();
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tryReserved();
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return true;
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}
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}
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if(checkSocketIsReadable && readCheckTarget->isReadable(0) ||
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checkSocketIsWritable && writeCheckTarget->isWritable(0) ||
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#ifdef ENABLE_ASYNC_DNS
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nameResolverCheck && nameResolveFinished() ||
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#endif // ENABLE_ASYNC_DNS
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!checkSocketIsReadable && !checkSocketIsWritable && !nameResolverCheck) {
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checkPoint.reset();
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if(_requestGroup->getSegmentMan()->downloadStarted) {
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// TODO Segment::isNull(), Change method name, it is very confusing.
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if(segment->isNull()) {
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segment = _requestGroup->getSegmentMan()->getSegment(cuid);
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if(segment.isNull()) {
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logger->info(MSG_NO_SEGMENT_AVAILABLE, cuid);
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return prepareForRetry(1);
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}
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}
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}
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return executeInternal();
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} else {
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if(checkPoint.elapsed(timeout)) {
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throw new DlRetryEx(EX_TIME_OUT);
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}
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e->commands.push_back(this);
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return false;
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}
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} catch(FatalException* err) {
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logger->error(MSG_DOWNLOAD_ABORTED, err, cuid, req->getUrl().c_str());
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onAbort(err);
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delete(err);
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req->resetUrl();
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_requestGroup->getSegmentMan()->errors++;
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return true;
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} catch(DlAbortEx* err) {
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logger->error(MSG_DOWNLOAD_ABORTED, err, cuid, req->getUrl().c_str());
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onAbort(err);
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delete(err);
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req->resetUrl();
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_requestGroup->getSegmentMan()->errors++;
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tryReserved();
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return true;
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} catch(DlRetryEx* err) {
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logger->info(MSG_RESTARTING_DOWNLOAD, err, cuid, req->getUrl().c_str());
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req->addTryCount();
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bool isAbort = e->option->getAsInt(PREF_MAX_TRIES) != 0 &&
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req->getTryCount() >= e->option->getAsInt(PREF_MAX_TRIES);
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if(isAbort) {
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onAbort(err);
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}
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if(isAbort) {
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logger->info(MSG_MAX_TRY, cuid, req->getTryCount());
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logger->error(MSG_DOWNLOAD_ABORTED, err, cuid, req->getUrl().c_str());
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delete(err);
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_requestGroup->getSegmentMan()->errors++;
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tryReserved();
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return true;
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} else {
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delete(err);
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return prepareForRetry(e->option->getAsInt(PREF_RETRY_WAIT));
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}
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}
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}
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void AbstractCommand::tryReserved() {
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Commands commands = _requestGroup->createNextCommand(e, 1);
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e->addCommand(commands);
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}
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bool AbstractCommand::prepareForRetry(int32_t wait) {
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_requestGroup->getSegmentMan()->cancelSegment(cuid);
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Command* command = InitiateConnectionCommandFactory::createInitiateConnectionCommand(cuid, req, _requestGroup, e);
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if(wait == 0) {
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e->commands.push_back(command);
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} else {
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SleepCommand* scom = new SleepCommand(cuid, e, command, wait);
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e->commands.push_back(scom);
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}
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return true;
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}
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void AbstractCommand::onAbort(Exception* ex) {
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logger->debug(MSG_UNREGISTER_CUID, cuid);
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//_segmentMan->unregisterId(cuid);
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_requestGroup->getSegmentMan()->cancelSegment(cuid);
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}
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void AbstractCommand::disableReadCheckSocket() {
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if(checkSocketIsReadable) {
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e->deleteSocketForReadCheck(readCheckTarget, this);
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checkSocketIsReadable = false;
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readCheckTarget = SocketHandle();
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}
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}
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void AbstractCommand::setReadCheckSocket(const SocketHandle& socket) {
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if(!socket->isOpen()) {
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disableReadCheckSocket();
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} else {
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if(checkSocketIsReadable) {
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if(readCheckTarget != socket) {
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e->deleteSocketForReadCheck(readCheckTarget, this);
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e->addSocketForReadCheck(socket, this);
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readCheckTarget = socket;
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}
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} else {
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e->addSocketForReadCheck(socket, this);
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checkSocketIsReadable = true;
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readCheckTarget = socket;
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}
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}
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}
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void AbstractCommand::disableWriteCheckSocket() {
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if(checkSocketIsWritable) {
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e->deleteSocketForWriteCheck(writeCheckTarget, this);
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checkSocketIsWritable = false;
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writeCheckTarget = SocketHandle();
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}
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}
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void AbstractCommand::setWriteCheckSocket(const SocketHandle& socket) {
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if(!socket->isOpen()) {
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disableWriteCheckSocket();
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} else {
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if(checkSocketIsWritable) {
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if(writeCheckTarget != socket) {
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e->deleteSocketForWriteCheck(writeCheckTarget, this);
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e->addSocketForWriteCheck(socket, this);
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writeCheckTarget = socket;
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}
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} else {
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e->addSocketForWriteCheck(socket, this);
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checkSocketIsWritable = true;
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writeCheckTarget = socket;
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}
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}
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}
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bool AbstractCommand::resolveHostname(const string& hostname,
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const NameResolverHandle& resolver) {
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string ipaddr = DNSCacheSingletonHolder::instance()->find(hostname);
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if(ipaddr.empty()) {
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#ifdef ENABLE_ASYNC_DNS
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switch(resolver->getStatus()) {
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case NameResolver::STATUS_READY:
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logger->info(MSG_RESOLVING_HOSTNAME, cuid, hostname.c_str());
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resolver->resolve(hostname);
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setNameResolverCheck(resolver);
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return false;
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case NameResolver::STATUS_SUCCESS:
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logger->info(MSG_NAME_RESOLUTION_COMPLETE, cuid,
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hostname.c_str(), resolver->getAddrString().c_str());
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DNSCacheSingletonHolder::instance()->put(hostname, resolver->getAddrString());
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return true;
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break;
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case NameResolver::STATUS_ERROR:
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throw new DlAbortEx(MSG_NAME_RESOLUTION_FAILED, cuid,
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hostname.c_str(),
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resolver->getError().c_str());
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default:
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return false;
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}
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#else
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logger->info(MSG_RESOLVING_HOSTNAME, cuid, hostname.c_str());
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resolver->resolve(hostname);
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logger->info(MSG_NAME_RESOLUTION_COMPLETE, cuid,
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hostname.c_str(), resolver->getAddrString().c_str());
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DNSCacheSingletonHolder::instance()->put(hostname, resolver->getAddrString());
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return true;
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#endif // ENABLE_ASYNC_DNS
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} else {
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logger->info(MSG_DNS_CACHE_HIT, cuid,
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hostname.c_str(), ipaddr.c_str());
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resolver->setAddr(ipaddr);
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return true;
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}
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}
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#ifdef ENABLE_ASYNC_DNS
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void AbstractCommand::setNameResolverCheck(const NameResolverHandle& resolver) {
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nameResolverCheck = true;
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e->addNameResolverCheck(resolver, this);
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}
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void AbstractCommand::disableNameResolverCheck(const NameResolverHandle& resolver) {
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nameResolverCheck = false;
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e->deleteNameResolverCheck(resolver, this);
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}
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bool AbstractCommand::nameResolveFinished() const {
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return false;
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}
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#endif // ENABLE_ASYNC_DNS
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