mirror of https://github.com/aria2/aria2
614 lines
20 KiB
C++
614 lines
20 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 <algorithm>
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#include "Request.h"
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#include "DownloadEngine.h"
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#include "Option.h"
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#include "PeerStat.h"
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#include "SegmentMan.h"
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#include "Logger.h"
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#include "Segment.h"
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#include "DlAbortEx.h"
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#include "DlRetryEx.h"
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#include "DownloadFailureException.h"
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#include "CreateRequestCommand.h"
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#include "InitiateConnectionCommandFactory.h"
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#include "SleepCommand.h"
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#ifdef ENABLE_ASYNC_DNS
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#include "AsyncNameResolver.h"
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#endif // ENABLE_ASYNC_DNS
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#include "StreamCheckIntegrityEntry.h"
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#include "PieceStorage.h"
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#include "Socket.h"
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#include "message.h"
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#include "prefs.h"
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#include "StringFormat.h"
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#include "ServerStat.h"
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#include "RequestGroupMan.h"
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#include "A2STR.h"
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#include "util.h"
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#include "LogFactory.h"
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#include "DownloadContext.h"
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#include "wallclock.h"
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namespace aria2 {
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AbstractCommand::AbstractCommand(int32_t cuid,
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const SharedHandle<Request>& req,
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const SharedHandle<FileEntry>& fileEntry,
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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), _requestGroup(requestGroup),
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req(req), _fileEntry(fileEntry), e(e), socket(s),
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checkSocketIsReadable(false), checkSocketIsWritable(false),
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nameResolverCheck(false)
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{
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if(!socket.isNull() && socket->isOpen()) {
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setReadCheckSocket(socket);
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}
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timeout = _requestGroup->getTimeout();
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_requestGroup->increaseStreamConnection();
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_requestGroup->increaseNumCommand();
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}
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AbstractCommand::~AbstractCommand() {
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disableReadCheckSocket();
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disableWriteCheckSocket();
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#ifdef ENABLE_ASYNC_DNS
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disableNameResolverCheck(_asyncNameResolver);
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#endif // ENABLE_ASYNC_DNS
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_requestGroup->decreaseNumCommand();
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_requestGroup->decreaseStreamConnection();
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}
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bool AbstractCommand::execute() {
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if(logger->debug()) {
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logger->debug("CUID#%d - socket: read:%d, write:%d, hup:%d, err:%d",
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cuid, _readEvent, _writeEvent, _hupEvent, _errorEvent);
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}
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try {
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if(_requestGroup->downloadFinished() || _requestGroup->isHaltRequested()) {
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//logger->debug("CUID#%d - finished.", cuid);
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return true;
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}
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if(!req.isNull() && req->removalRequested()) {
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if(logger->debug()) {
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logger->debug
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("CUID#%d - Discard original URI=%s because it is requested.",
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cuid, req->getUri().c_str());
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}
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return prepareForRetry(0);
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}
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// TODO it is not needed to check other PeerStats every time.
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// Find faster Request when no segment is available.
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if(!req.isNull() && _fileEntry->countPooledRequest() > 0 &&
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!_requestGroup->getPieceStorage()->hasMissingUnusedPiece()) {
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SharedHandle<Request> fasterRequest = _fileEntry->findFasterRequest(req);
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if(!fasterRequest.isNull()) {
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logger->info("CUID#%d - Use faster Request hostname=%s, port=%u",
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cuid,
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fasterRequest->getHost().c_str(),
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fasterRequest->getPort());
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// Cancel current Request object and use faster one.
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_fileEntry->removeRequest(req);
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Command* command =
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InitiateConnectionCommandFactory::createInitiateConnectionCommand
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(cuid, fasterRequest, _fileEntry, _requestGroup, e);
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e->setNoWait(true);
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e->commands.push_back(command);
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return true;
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}
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}
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if((checkSocketIsReadable && _readEvent) ||
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(checkSocketIsWritable && _writeEvent) ||
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_hupEvent ||
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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 = global::wallclock;
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if(!_requestGroup->getPieceStorage().isNull()) {
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_segments.clear();
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_requestGroup->getSegmentMan()->getInFlightSegment(_segments, cuid);
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if(req.isNull() || req->getMaxPipelinedRequest() == 1 ||
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_requestGroup->getDownloadContext()->getFileEntries().size() == 1) {
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if(_segments.empty()) {
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SharedHandle<Segment> segment =
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_requestGroup->getSegmentMan()->getSegment(cuid);
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if(!segment.isNull()) {
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_segments.push_back(segment);
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}
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}
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if(_segments.empty()) {
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// TODO socket could be pooled here if pipelining is enabled...
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logger->info(MSG_NO_SEGMENT_AVAILABLE, cuid);
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// When all segments are ignored in SegmentMan, there are
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// no URIs available, so don't retry.
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if(_requestGroup->getSegmentMan()->allSegmentsIgnored()) {
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if(logger->debug()) {
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logger->debug("All segments are ignored.");
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}
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return true;
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} else {
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return prepareForRetry(1);
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}
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}
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} else {
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size_t maxSegments = req->getMaxPipelinedRequest();
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if(_segments.size() < maxSegments) {
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_requestGroup->getSegmentMan()->getSegment
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(_segments, cuid, _fileEntry, maxSegments);
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}
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if(_segments.empty()) {
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return prepareForRetry(0);
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}
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}
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}
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return executeInternal();
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} else if(_errorEvent) {
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throw DL_RETRY_EX
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(StringFormat(MSG_NETWORK_PROBLEM,
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socket->getSocketError().c_str()).str());
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} else {
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if(checkPoint.difference(global::wallclock) >= timeout) {
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// timeout triggers ServerStat error state.
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SharedHandle<ServerStat> ss =
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e->_requestGroupMan->getOrCreateServerStat(req->getHost(),
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req->getProtocol());
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ss->setError();
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throw DL_RETRY_EX2(EX_TIME_OUT, downloadresultcode::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(DlAbortEx& err) {
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if(req.isNull()) {
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if(logger->debug()) {
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logger->debug(EX_EXCEPTION_CAUGHT, err);
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}
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} else {
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logger->error(MSG_DOWNLOAD_ABORTED,
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DL_ABORT_EX2(StringFormat
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("URI=%s", req->getCurrentUri().c_str()).str(),err),
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cuid, req->getUri().c_str());
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_fileEntry->addURIResult(req->getUri(), err.getCode());
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_requestGroup->setLastUriResult(req->getUri(), err.getCode());
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}
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onAbort();
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tryReserved();
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return true;
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} catch(DlRetryEx& err) {
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assert(!req.isNull());
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logger->info(MSG_RESTARTING_DOWNLOAD,
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DL_RETRY_EX2(StringFormat
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("URI=%s", req->getCurrentUri().c_str()).str(),err),
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cuid, req->getUri().c_str());
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req->addTryCount();
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req->resetRedirectCount();
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const unsigned int maxTries = getOption()->getAsInt(PREF_MAX_TRIES);
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bool isAbort = maxTries != 0 && req->getTryCount() >= maxTries;
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if(isAbort) {
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onAbort();
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logger->info(MSG_MAX_TRY, cuid, req->getTryCount());
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logger->error(MSG_DOWNLOAD_ABORTED, err, cuid, req->getUri().c_str());
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_fileEntry->addURIResult(req->getUri(), err.getCode());
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_requestGroup->setLastUriResult(req->getUri(), err.getCode());
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tryReserved();
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return true;
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} else {
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return prepareForRetry(0);
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}
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} catch(DownloadFailureException& err) {
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logger->error(EX_EXCEPTION_CAUGHT, err);
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if(!req.isNull()) {
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_fileEntry->addURIResult(req->getUri(), err.getCode());
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_requestGroup->setLastUriResult(req->getUri(), err.getCode());
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}
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_requestGroup->setHaltRequested(true);
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return true;
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}
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}
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void AbstractCommand::tryReserved() {
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if(_requestGroup->getDownloadContext()->getFileEntries().size() == 1) {
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const SharedHandle<FileEntry>& entry =
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_requestGroup->getDownloadContext()->getFirstFileEntry();
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// Don't create new command if currently file length is unknown
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// and there are no URI left. Because file length is unknown, we
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// can assume that there are no in-flight request object.
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if(entry->getLength() == 0 && entry->getRemainingUris().empty()) {
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if(logger->debug()) {
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logger->debug("CUID#%d - Not trying next request."
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" No reserved/pooled request is remaining and"
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" total length is still unknown.", cuid);
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}
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return;
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}
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}
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if(logger->debug()) {
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logger->debug("CUID#%d - Trying reserved/pooled request.", cuid);
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}
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std::vector<Command*> commands;
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_requestGroup->createNextCommand(commands, e, 1);
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e->setNoWait(true);
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e->addCommand(commands);
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}
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bool AbstractCommand::prepareForRetry(time_t wait) {
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if(!_requestGroup->getPieceStorage().isNull()) {
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_requestGroup->getSegmentMan()->cancelSegment(cuid);
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}
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if(!req.isNull()) {
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_fileEntry->poolRequest(req);
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if(logger->debug()) {
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logger->debug("CUID#%d - Pooling request URI=%s",
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cuid, req->getUri().c_str());
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}
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if(!_requestGroup->getSegmentMan().isNull()) {
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_requestGroup->getSegmentMan()->recognizeSegmentFor(_fileEntry);
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}
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}
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Command* command = new CreateRequestCommand(cuid, _requestGroup, e);
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if(wait == 0) {
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e->setNoWait(true);
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e->commands.push_back(command);
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} else {
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SleepCommand* scom = new SleepCommand(cuid, e, _requestGroup,
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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() {
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if(!req.isNull()) {
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// TODO This might be a problem if the failure is caused by proxy.
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e->_requestGroupMan->getOrCreateServerStat(req->getHost(),
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req->getProtocol())->setError();
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_fileEntry->removeIdenticalURI(req->getUri());
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_fileEntry->removeRequest(req);
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}
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if(logger->debug()) {
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logger->debug("CUID#%d - Aborting download", cuid);
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}
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if(!_requestGroup->getPieceStorage().isNull()) {
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_requestGroup->getSegmentMan()->cancelSegment(cuid);
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}
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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::setReadCheckSocketIf
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(const SharedHandle<SocketCore>& socket, bool pred)
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{
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if(pred) {
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setReadCheckSocket(socket);
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} else {
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disableReadCheckSocket();
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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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void AbstractCommand::setWriteCheckSocketIf
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(const SharedHandle<SocketCore>& socket, bool pred)
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{
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if(pred) {
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setWriteCheckSocket(socket);
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} else {
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disableWriteCheckSocket();
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}
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}
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// Returns proxy option value for the given protocol.
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static const std::string& getProxyOptionFor
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(const std::string& proxyPref, const SharedHandle<Option>& option)
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{
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if(option->defined(proxyPref)) {
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return option->get(proxyPref);
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} else {
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return option->get(PREF_ALL_PROXY);
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}
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}
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// Returns proxy URI for given protocol. If no proxy URI is defined,
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// then returns an empty string.
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static const std::string& getProxyUri
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(const std::string& protocol, const SharedHandle<Option>& option)
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{
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if(protocol == Request::PROTO_HTTP) {
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return getProxyOptionFor(PREF_HTTP_PROXY, option);
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} else if(protocol == Request::PROTO_HTTPS) {
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return getProxyOptionFor(PREF_HTTPS_PROXY, option);
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} else if(protocol == Request::PROTO_FTP) {
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return getProxyOptionFor(PREF_FTP_PROXY, option);
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} else {
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return A2STR::NIL;
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}
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}
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// Returns true if proxy is defined for the given protocol. Otherwise
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// returns false.
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static bool isProxyRequest
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(const std::string& protocol, const SharedHandle<Option>& option)
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{
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const std::string& proxyUri = getProxyUri(protocol, option);
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return !proxyUri.empty() && Request().setUri(proxyUri);
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}
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class DomainMatch {
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private:
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std::string _hostname;
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public:
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DomainMatch(const std::string& hostname):_hostname(hostname) {}
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bool operator()(const std::string& domain) const
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{
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if(util::startsWith(domain, A2STR::DOT_C)) {
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return util::endsWith(_hostname, domain);
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} else {
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return util::endsWith(_hostname, A2STR::DOT_C+domain);
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}
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}
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};
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static bool inNoProxy(const SharedHandle<Request>& req,
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const std::string& noProxy)
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{
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std::vector<std::string> entries;
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util::split(noProxy, std::back_inserter(entries), ",", true);
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if(entries.empty()) {
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return false;
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}
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return
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std::find_if(entries.begin(), entries.end(),
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DomainMatch(A2STR::DOT_C+req->getHost())) != entries.end();
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}
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bool AbstractCommand::isProxyDefined() const
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{
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return isProxyRequest(req->getProtocol(), getOption()) &&
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!inNoProxy(req, getOption()->get(PREF_NO_PROXY));
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}
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SharedHandle<Request> AbstractCommand::createProxyRequest() const
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{
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SharedHandle<Request> proxyRequest;
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if(inNoProxy(req, getOption()->get(PREF_NO_PROXY))) {
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return proxyRequest;
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}
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std::string proxy = getProxyUri(req->getProtocol(), getOption());
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if(!proxy.empty()) {
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proxyRequest.reset(new Request());
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if(proxyRequest->setUri(proxy)) {
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if(logger->debug()) {
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logger->debug("CUID#%d - Using proxy", cuid);
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}
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} else {
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if(logger->debug()) {
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logger->debug("CUID#%d - Failed to parse proxy string", cuid);
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}
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proxyRequest.reset();
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}
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}
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return proxyRequest;
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}
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#ifdef ENABLE_ASYNC_DNS
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bool AbstractCommand::isAsyncNameResolverInitialized() const
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{
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return !_asyncNameResolver.isNull();
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}
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void AbstractCommand::initAsyncNameResolver(const std::string& hostname)
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{
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_asyncNameResolver.reset(new AsyncNameResolver());
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logger->info(MSG_RESOLVING_HOSTNAME, cuid, hostname.c_str());
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_asyncNameResolver->resolve(hostname);
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setNameResolverCheck(_asyncNameResolver);
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}
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bool AbstractCommand::asyncResolveHostname()
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{
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switch(_asyncNameResolver->getStatus()) {
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case AsyncNameResolver::STATUS_SUCCESS:
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return true;
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case AsyncNameResolver::STATUS_ERROR:
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if(!isProxyRequest(req->getProtocol(), getOption())) {
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e->_requestGroupMan->getOrCreateServerStat
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(req->getHost(), req->getProtocol())->setError();
|
|
}
|
|
throw DL_ABORT_EX(StringFormat(MSG_NAME_RESOLUTION_FAILED, cuid,
|
|
_asyncNameResolver->getHostname().c_str(),
|
|
_asyncNameResolver->getError().c_str()).str());
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
const std::vector<std::string>& AbstractCommand::getResolvedAddresses()
|
|
{
|
|
return _asyncNameResolver->getResolvedAddresses();
|
|
}
|
|
|
|
void AbstractCommand::setNameResolverCheck
|
|
(const SharedHandle<AsyncNameResolver>& resolver) {
|
|
if(!resolver.isNull()) {
|
|
nameResolverCheck = true;
|
|
e->addNameResolverCheck(resolver, this);
|
|
}
|
|
}
|
|
|
|
void AbstractCommand::disableNameResolverCheck
|
|
(const SharedHandle<AsyncNameResolver>& resolver) {
|
|
if(!resolver.isNull()) {
|
|
nameResolverCheck = false;
|
|
e->deleteNameResolverCheck(resolver, this);
|
|
}
|
|
}
|
|
|
|
bool AbstractCommand::nameResolveFinished() const {
|
|
return
|
|
_asyncNameResolver->getStatus() == AsyncNameResolver::STATUS_SUCCESS ||
|
|
_asyncNameResolver->getStatus() == AsyncNameResolver::STATUS_ERROR;
|
|
}
|
|
#endif // ENABLE_ASYNC_DNS
|
|
|
|
void AbstractCommand::prepareForNextAction(Command* nextCommand)
|
|
{
|
|
SharedHandle<CheckIntegrityEntry> entry
|
|
(new StreamCheckIntegrityEntry(_requestGroup, nextCommand));
|
|
|
|
std::vector<Command*> commands;
|
|
try {
|
|
_requestGroup->processCheckIntegrityEntry(commands, entry, e);
|
|
} catch(RecoverableException& e) {
|
|
std::for_each(commands.begin(), commands.end(), Deleter());
|
|
throw;
|
|
}
|
|
e->addCommand(commands);
|
|
e->setNoWait(true);
|
|
}
|
|
|
|
bool AbstractCommand::checkIfConnectionEstablished
|
|
(const SharedHandle<SocketCore>& socket,
|
|
const std::string& connectedHostname,
|
|
const std::string& connectedAddr,
|
|
uint16_t connectedPort)
|
|
{
|
|
if(socket->isReadable(0)) {
|
|
std::string error = socket->getSocketError();
|
|
if(!error.empty()) {
|
|
// See also InitiateConnectionCommand::executeInternal()
|
|
e->markBadIPAddress(connectedHostname, connectedAddr, connectedPort);
|
|
if(!e->findCachedIPAddress(connectedHostname, connectedPort).empty()) {
|
|
logger->info(MSG_CONNECT_FAILED_AND_RETRY,
|
|
cuid, connectedAddr.c_str(), connectedPort);
|
|
Command* command =
|
|
InitiateConnectionCommandFactory::createInitiateConnectionCommand
|
|
(cuid, req, _fileEntry, _requestGroup, e);
|
|
e->setNoWait(true);
|
|
e->commands.push_back(command);
|
|
return false;
|
|
}
|
|
e->removeCachedIPAddress(connectedHostname, connectedPort);
|
|
// Don't set error if proxy server is used and its method is GET.
|
|
if(resolveProxyMethod(req->getProtocol()) != V_GET ||
|
|
!isProxyRequest(req->getProtocol(), getOption())) {
|
|
e->_requestGroupMan->getOrCreateServerStat
|
|
(req->getHost(), req->getProtocol())->setError();
|
|
}
|
|
throw DL_RETRY_EX
|
|
(StringFormat(MSG_ESTABLISHING_CONNECTION_FAILED, error.c_str()).str());
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
const std::string& AbstractCommand::resolveProxyMethod
|
|
(const std::string& protocol) const
|
|
{
|
|
if(getOption()->get(PREF_PROXY_METHOD) == V_TUNNEL ||
|
|
Request::PROTO_HTTPS == protocol) {
|
|
return V_TUNNEL;
|
|
} else {
|
|
return V_GET;
|
|
}
|
|
}
|
|
|
|
const SharedHandle<Option>& AbstractCommand::getOption() const
|
|
{
|
|
return _requestGroup->getOption();
|
|
}
|
|
|
|
} // namespace aria2
|