Added SEED to console output, which represents the number of
seeders currently the client is connecting to.
* src/ConsoleStatCalc.cc
* src/ConsoleStatCalc.h
* src/DownloadEngine.cc
* src/NullStatCalc.h
* src/StatCalc.h
Reduced the number of calls to PeerStorage::calculateStat() and
SegmentMan::calculateDownloadSpeed() to lower CPU usage on
higher transfer rate.
* src/DefaultBtInteractive.cc
* src/DefaultBtMessageDispatcher.cc
* src/DefaultPeerStorage.cc
* src/DefaultPeerStorage.h
* src/DownloadCommand.cc
* src/DownloadEngine.cc
* src/PeerStorage.h
* src/SegmentMan.cc
* src/SegmentMan.h
* test/MockPeerStorage.h
Added --event-poll option to select the method for polling
events.
The available methods are "select" and "epoll". "epoll" is
available on Linux only. The earlier release has the compile
option to choose from these methods.
* configure.ac
* src/RequestGroupMan.cc
* src/OptionHandlerFactory.cc
* src/EpollEventPoll.h
* src/StreamFileAllocationEntry.cc
* src/a2io.h
* src/SelectEventPoll.h
* src/option_processing.cc
* src/prefs.h
* src/EpollEventPoll.cc
* src/EventPoll.h
* src/SocketCore.h
* src/Makefile.am
* src/main.cc
* src/DownloadEngine.h
* src/SelectEventPoll.cc
* src/DownloadEngine.cc
* src/SocketCore.cc
* src/DownloadEngineFactory.cc
* src/Makefile.in
* src/prefs.cc
* src/usage_text.h
Added the ability to pool proxy connection.
The conneciton in FTP with proxy-method=GET is not pooled.
Proxy-Connection header will not be sent when sending CONNECT
method.
* src/DownloadEngine.cc
* src/DownloadEngine.h
* src/FtpFinishDownloadCommand.cc
* src/FtpInitiateConnectionCommand.cc
* src/FtpNegotiationCommand.cc
* src/HttpDownloadCommand.cc
* src/HttpInitiateConnectionCommand.cc
* src/HttpRequest.cc
* src/HttpRequest.h
* src/HttpResponse.cc
* src/HttpSkipResponseCommand.cc
* test/HttpRequestTest.cc
* test/HttpResponseTest.cc
Issue PWD command first and get working directory and use it as
a prefix
for CWD command.
* src/DownloadEngine.cc
* src/DownloadEngine.h
* src/FtpConnection.cc
* src/FtpConnection.h
* src/FtpFinishDownloadCommand.cc
* src/FtpInitiateConnectionCommand.cc
* src/FtpNegotiationCommand.cc
* src/FtpNegotiationCommand.h
* test/FtpConnectionTest.cc
If error event is received in epoll, then abort download
immediately.
* src/AbstractCommand.cc
* src/Command.cc
* src/Command.h
* src/DownloadEngine.cc
* src/PeerAbstractCommand.cc
Implemented download speed based URI selection algorithm.
Introduced new option --uri-selector.
If --uri-selector=feedback is given, aria2 uses download speed
observed
in the previous downloads and chooses fastest server in the URI
list.
Currently at most 10 URIs are considered to introduce
randomeness for
finding better servers. The speed is average download speed in
the
downloads.
On the other hand, if --uri-selector=inorder is given, which is
default,
URI is tried in order in URI list.
The usage text for the new option has not been written yet.
* src/AbstractCommand.cc
* src/DownloadCommand.cc
* src/DownloadEngine.cc
* src/DownloadEngineFactory.cc
* src/InOrderURISelector.cc
* src/InOrderURISelector.h
* src/OptionHandlerFactory.cc
* src/PeerStat.h
* src/RequestGroup.cc
* src/RequestGroup.h
* src/RequestGroupMan.cc
* src/RequestGroupMan.h
* src/SegmentMan.cc
* src/SegmentMan.h
* src/ServerStat.cc
* src/ServerStat.h
* src/ServerStatMan.cc
* src/ServerStatMan.h
* src/ServerStatURISelector.cc
* src/ServerStatURISelector.h
* src/URISelector.h
* src/option_processing.cc
* src/prefs.cc
* src/prefs.h
* test/InOrderURISelectorTest.cc
* test/RequestGroupManTest.cc
* test/ServerStatManTest.cc
* test/ServerStatURISelectorTest.cc
Applied Ross's aria2-0.13.2+1-mingw-5.patch, which changes the
type of
socket from int to sock_t as sockets are unsigned in Windows.
For AsyncNameResolver, DownloadEngine, I did additional
modification
for the portion of the code changed according to epoll support.
I defined sock_t in a2netcompat.h to use sock_t without
including
SocketCore.h.
* src/AsyncNameResolver.cc
* src/AsyncNameResolver.h
* src/DownloadEngine.cc
* src/DownloadEngine.h
* src/SocketCore.cc
* src/SocketCore.h
* src/a2netcompat.h
Calculate piece hash when data is arrived if the data is arrived
in
order. This removes additional read operation for hash
calculation.
If the data is arrived in out of order, the hash is calucated
when the
piece is completed. This is the same behavior as the old
implementation.
* src/BtPieceMessage.cc
* src/DefaultBtProgressInfoFile.cc
* src/DefaultPieceStorage.cc
* src/DownloadCommand.cc
* src/DownloadCommand.h
* src/DownloadEngine.cc
* src/GrowSegment.cc
* src/GrowSegment.h
* src/Piece.cc
* src/Piece.h
* src/PiecedSegment.cc
* src/PiecedSegment.h
* src/Segment.h
* test/PieceTest.cc
Added epoll support. Use epoll if it is available. If not, use
select.
When async dns is enabled in compile time, epoll support is
enabled
only when aria2 is built with c-ares. This condition statement
is
defined in a2io.h.
Currently aria2 supports both c-ares and ares, but ares is
maintained
for quite a while and debian already has c-ares package, ares
support
will be dropped in the future version.
* configure.ac
* src/AbstractCommand.cc
* src/AsyncNameResolver.cc
* src/AsyncNameResolver.h
* src/Command.cc
* src/Command.h
* src/DownloadEngine.cc
* src/DownloadEngine.h
* src/PeerAbstractCommand.cc
* src/SocketCore.cc
* src/SocketCore.h
* src/a2io.h
Reuse socket if the origin server supports HTTP keep-alive and
--enable-http-keep-alive or --enable-http-pipelining is given.
The current implementation doesn't reuse the connections
established
against proxy server.
* src/AbstractCommand.cc
* src/DownloadEngine.cc
* src/DownloadEngine.h
* src/HttpDownloadCommand.cc
* src/HttpInitiateConnectionCommand.cc
* src/HttpResponseCommand.cc
Eliminates the time lag between sequential downloads and
commands in
the same RequestGroup.
In old implementation, aria2 occasionally waits 1 seconds before
executing next command or RequestGroup.
This is really a waste of time, and new implementation
eliminates
this unnecessary time lag.
* src/AbstractCommand.cc
* src/AutoSaveCommand.cc
* src/CheckIntegrityCommand.cc
* src/Command.{cc, h}
* src/DownloadEngine.{cc, h}
* src/DownloadEngineFactory.cc
* src/FileAllocationCommand.cc
* src/FileAllocationDispatcherCommand.cc
* src/FillRequestGroupCommand.cc
* src/FtpInitiateConnectionCommand.cc
* src/HaveEraseCommand.cc
* src/HttpInitiateConnectionCommand.cc
* src/HttpResponseCommand.cc
* src/RealtimeCommand.cc
* src/RequestGroup.cc
* src/RequestGroupMan.cc
* src/StreamFileAllocationEntry.cc
* src/TimeBasedCommand.{cc, h}
* src/TimedHaltCommand.cc
Rewritten SharedHandle. Now copy constructor taking raw pointer
has
keyword explicit and SharedHandle's default constructor
initializes
its internal obj to null, old implementation initializes it
using
obj's default constructor.
To assign null, write SharedHandle<T> x(...); x.reset();
TODO: test/SharedHandleTest.cc needs more tests.
* src/SharedHandle.h
Fixed the bug that aria2 only uses first dns server in
resolv.conf
when compiled with async DNS support.
* src/DownloadEngine.cc
* src/option_processing.cc: Lengthened DNS timeout to 30. I
think old
value '10' will be a little bit short when some DNS servers are
offline and several DNS servers are tried. It should be
configured
by command-line option.
Added the ability to stop aria2 itself when given time has
passed
from start. Use --stop option to specify time in minutes.
When 0 is given, this feature is disabled.
* src/OptionHandlerFactory.cc
* src/TimeBasedCommand.h: Make _interval protected scope.
* src/HelpItemFactory.cc
* src/option_processing.cc
* src/prefs.h
* src/FillRequestGroupCommand.cc: Evaluate _e->isHaltRequested()
before calling RequestGroupMan::fillRequestGroupFromReserver().
Without this modification, the result list shows "ERR" when
aria2 is
stopped by --stop option. It should be "INPR".
* src/DownloadEngine.{h, cc}
* src/DownloadEngineFactory.cc
* src/usage_text.h
* src/TimedHaltCommand.{h, cc}: New class.
Added DHT functionality, compatible with mainline.
DHT is disabled by default. To enable it, give --enable-dht to
aria2c.
You may need to specify entry point to DHT network using
--dht-entry-point. DHT uses UDP port to listen incoming message.
Use --dht-listen-port to specify port number. Make sure that
your
firewall configuration can pass through UDP traffic to the port.
The routing table is saved in $HOME/.aria2/dht.dat.
* src/DHT*
* src/BNode.{h, cc}
* src/PeerInteractionCommand.cc: enable DHT functionality for a
particular torrent.
* src/Data.cc: Rewritten ctor.
* src/OptionHandlerFactory.cc: Added --enable-dht,
--dht-listen-port,
--dht-entry-point.
* src/DefaultBtInteractive.cc: Send port message if dht is
enabled.
* src/RequestGroup.cc: Initialize DHT functionality. When
download
ends, remove BtContext from DHTPeerAnnounceStorage.
* src/BtPortMessage.{h, cc}: Rewritten.
* src/message.h
* src/OptionHandlerImpl.cc
* src/option_processing.cc: Added --enable-dht,
--dht-listen-port,
--dht-entry-point.
* src/Dictionary.{h, cc} (remove): New function.
* src/prefs.h
* src/DefaultBtMessageFactory.h
* src/BtHandshakeMessage.cc
* src/ActivePeerConnectionCommand.cc
* src/SocketCore.{h, cc}: Added datagram socket support.
* src/DefaultBtMessageFactory.cc
* src/BtSetup.cc: Add BtContext to DHTPeerAnnounceStorage here.
Create DHT commands.
* src/BtMessageFactory.h
* src/PeerMessageUtil.{h, cc}
Fixed the bug#1845750; CTRL+C does not stop torrent.
aria2 repeatedly sends stopped request when tracker returns error code.
* src/AnnounceList.cc
* test/AnnounceListTest.cc
* src/AnnounceTier.h
Added a message when ctrl-c is hit.
Now second ctrl-c is also handled in signal handler.
* src/RequestGroupMan.{h, cc}
* src/RequestGroup.{h, cc}
* src/MultiUrlRequestInfo.cc
* src/DownloadEngine.cc
* src/TrackerWatcherCommand.cc
Rewritten to add content-type support.
* src/DownloadHandler.{h, cc}
* src/BtPostDownloadHandler.{h, cc}
* test/BtPostDownloadHandlerTest.cc
* src/MetalinkPostDownloadHandler.{h, cc}
* test/MetalinkPostDownloadHandlerTest.cc
* src/PostDownloadHandler.{h, cc}
* src/DownloadHandlerConstants.{h, cc}
* src/RequestGroup.cc
* src/HttpResponseCommand.cc
* src/FtpNegotiationCommand.cc
* src/SingleFileDownloadContext.{h, cc}
* src/RequestGroup.h
* src/RequestGroupCriteria.h
* src/ContentTypeRequestGroupCriteria.h
Added 'mem' option value for --follow-metalink,
--follow-torrent.
If it is give, metalink/torrent file is not written to the disk,
but
just is kept in memory. Parsing is occurred on memory.
* src/MetalinkHelper.{h, cc}
* src/MetalinkProcessor.h
* src/Xml2MetalinkProcessor.{h, cc}
* test/Xml2MetalinkProcessorTest.cc
* src/DownloadHandlerFactory.{h, cc}
* test/DownloadHandlerFactoryTest.cc
* src/PreDownloadHandler.{h, cc}
* src/OptionHandlerFactory.cc
* src/DefaultBtContext.{h, cc}
* test/DefaultBtContextTest.cc
* src/version_usage.cc
* src/Metalink2RequestGroup.{h, cc}
* src/RequestGroup.{h, cc}
* src/a2functional.h
* test/a2functionalTest.cc
* src/MemoryBufferPreDownloadHandler.{h, cc}
* src/OptionHandlerImpl.h
* src/prefs.h
* src/Util.{h, cc}
* test/UtilTest.cc
Keep DownloadResult rather than RequestGroup after downloads to
reduce
memory usage.
* src/RequestGroupMan.{h, cc}
* src/DownloadEngine.cc
* src/BtDependency.{h, cc}: Changed the type of dependee from
WeakHandle to SharedHandle because WeakHandle could be null.
* src/RequestGroup.{h, cc}
* src/DownloadEngineFactory.cc
* src/DownloadResult.h
Set totalLength after download finished
* src/UnknownLengthPieceStorage.{h, cc}
Keep torrent file specified in metalink in memory.
* src/Metalink2RequestGroup.cc
* src/BtDependency.cc
* src/TrueRequestGroupCriteria.h
Fixed the bug: seekg is used where seekp should be used.
* src/ByteArrayDiskWriter.cc
* test/ByteArraydiskWriterTest.cc
Fixed: compilation fails without c-ares/ares
* src/DownloadEngine.cc (addCommand): Moved outside #ifdef
Generate http/ftp commands only when download is incomplete.
* src/BtFileAllocationEntry.cc (prepareForNextAction)
Preallocate non-requested file which is adjacent forward to
requested
file('requested' files means the files given in --select-file
option)
if they share a same piece.
This fixes long pause in the file system which doesn't support
sparse
files like FAT32 while downloading.
* src/MultiFileAllocationIterator.{h, cc}
* test/MultiFileAllocationIteratorTest.cc
* src/FileEntry.{h, cc}
Removed unused _option.
* src/MultiDiskAdaptor.h
* test/MultiDiskAdaptorTest.cc
* src/DefaultPieceStorage.cc
Set the default value of --seed-ratio to 1.0.
If 0.0 is given, then seeding continues regardless of share
ratio.
* src/version_usage.cc
* src/option_processing.cc
* src/BtSetup.cc
* doc/aria2c.1.txt
* doc/aria2c.1
Fixed: Selective download is not working in BitTorrent
* src/RequestGroup.cc
Introduced Sequence class. Use this instead of
Util::unfoldRange()
* src/PieceStorage.h
* test/MockPieceStorage.h
* src/UnknownLengthPieceStorage.h
* src/DefaultPieceStorage.{h, cc}
* src/Metalink2RequestGroup.cc
* src/RequestGroup.cc
* src/Sequence.h
* test/SequenceTest.cc
* src/IntSequence.h
* src/message.h
* src/Util.{h, cc}
* test/UtilTest.cc
Added new function 'parse' to catch exception thrown by
subclass's
parseArg
* src/OptionHandler.h
* src/OptionParser.cc
* src/NameMatchOptionHandler.h
* src/OptionHandlerImpl.h
* test/OptionHandlerTest.cc
Added IntegerRangeOptionHandler. Used for --listen-port and
--select-file. Now --listen-port accepts range of port.
* src/OptionHandlerFactory.cc
* src/version_usage.cc
* src/OptionHandlerImpl.h
* src/option_processing.cc
* src/BtSetup.cc
* src/PeerListenCommand.{h, cc}
* doc/aria2c.1.txt
* doc/aria2c.1
Implemented operator< for Exception class to provide easy way to
print
exception stack trace.
* src/Exception.{h, cc}
* src/main.cc
* src/option_processing.cc
Implemented BitTorrent/http/ftp integrated download.
I've rewritten lots of files and now some headers have forward
class declarations to reduce compile time.
The implementation is extremely alpha stage, I recommend to use this
for testing purpose only.
To reduce overhead to find commands whose socket is either
readable or writable in the download engine loop:
* src/Command.h, src/Command.cc
(STATUS): New enum.
(status): New variable.
(statusMatch): New function.
(setStatusActive): New function.
(setStatusInactive): New function.
* src/DownloadEngine.h, src/DownloadEngine.cc
(executeCommand): New function.
(run): Simplified.
(waitData): Call Command::setStatusActive() when command's
socket is
readable or writable.
To add chunk checksum validation:
* src/MetalinkEntry.h
(MetalinkChunkChecksum.h): New include.
(chunkChecksum): New variable.
* src/Request.h
(method): New variable.
(setMethod): New function.
(getMethod): New function.
(METHOD_GET): New static constant.
(METHOD_HEAD): New static constant.
* src/Xml2MetalinkProcessor.h
(getPieceHash): New function.
* src/PieceStorage.h
(markAllPiecesDone): New function.
(checkIntegrity): New function.
* src/FileAllocator.h
(NullFileAllocationMonitor.h): New include.
(FileAllocator): Initialize fileAllocationMonitor with new
NullFileAllocationMonitor().
* src/MultiDiskAdaptor.h
(messageDigest.h): Remove include.
(ctx): Removed.
(hashUpdate): Added ctx.
(MultiDiskAdaptor): Removed ctx.
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/UrlRequestInfo.h
(HeadResult): New class.
(digestAlgo): New variable.
(chunkChecksumLength): New variable.
(chunkChecksums): New variable.
(getHeadResult): New function.
(UrlRequestInfo): Added digestAlgo, chunkChecksumLength.
(setDigestAlgo): New function.
(setChunkChecksumLength): New function.
(setChunkChecksums): New function.
* src/DefaultPieceStorage.cc
(DiskAdaptorWriter.h): New include.
(ChunkChecksumValidator.h): New include.
(markAllPiecesDone): New function.
(checkIntegrity): New function.
* src/DefaultBtContext.h
(getPieceHashes): New function.
* src/TorrentRequestInfo.cc
(execute): Try to validate chunk checksum if file already exists
and
.aria2 file doesn't there and user allows aria2 to overwrite it.
* src/messageDigest.h
(~MessageDigestContext): Added digestFree().
* src/MetalinkRequestInfo.cc
(execute): Set digestAlgo, chunkChecksum, chunkChecksums to
reqInfo.
* src/DiskAdaptor.h
(messageDigest.h): New include.
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/DownloadCommand.h
(PeerStat.h): New include.
(maxDownloadSpeedLimit): New variable.
(startupIdleTime): New variable.
(lowestDownloadSpeedLimit): New variable.
(peerStat): New variable.
(setMaxDownloadSpeedLimit): New function.
(setStartupIdleTime): New function.
(setLowestDownloadSPeedLimit): New function.
* src/BtContext.h
(getPieceHashes): New function.
* src/main.cc
(main): Set PREF_REALTIME_CHUNK_CHECKSUM and
PREF_CHECK_INTEGRITY
option to true for testing purpose.
* src/BtPieceMessage.cc
(checkPieceHash): Use messageDigest
* src/DownloadEngine.cc
(SetDescriptor): Removed.
(AccumulateActiveCommand): Removed.
(waitData): Rewritten.
(updateFdSet): Rewritten.
* src/MultiDiskAdaptor.cc
(hashUpdate): Added ctx.
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/BitfieldMan.h
(isBitRangeSet): New function.
(unsetBitRange): New function.
* src/ByteArrayDiskWriter.h
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/ConsoleDownloadEngine.cc
(calculateStatistics): If nspeed < 0 then set nspeed to 0.
* src/DiskWriter.h
(messageDigest.h): New include.
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/ChunkChecksumValidator.h: New class.
* src/DiskAdaptorWriter.h: New class.
* src/prefs.h
(PREF_REALTIME_CHUNK_CHECKSUM): New definition.
(PREF_CHECK_INTEGRITY): New definition.
* src/HttpResponseCommand.cc
(handleDefaultEncoding): Added method "HEAD" handling.
Removed the call to
e->segmentMan->shouldCancelDownloadForSafety().
(handleOtherEncoding):
Added the call to
e->segmentMan->shouldCancelDownloadForSafety().
(createHttpDownloadCommand): Set maxDownloadSpeedLimit,
startupIdleTime, lowestDownloadSpeedLimit to command.
* src/SegmentMan.h
(getSegmentEntryByIndex): New function.
(getSegmentEntryByCuid): New function.
(getSegmentEntryIteratorByCuid): New function.
(diskWriter): DiskWriter -> DiskWriterHandle
(pieceHashes): New variable.
(chunkHashLength): New variable.
(digestAlgo): New variable.
(FindPeerStat): Removed.
(getPeerStat): Rewritten.
(markAllPiecesDone): New function.
(checkIntegrity): New function.
(tryChunkChecksumValidation): New function.
(isChunkChecksumValidationReady): New function.
* src/BitfieldMan.cc
(BitfieldMan): Initialized bitfieldLength, blocks to 0.
(BitfieldMan): Initialized blockLength, totalLength,
bitfieldLength,
blocks to 0.
(isBitRangeSet): New function.
(unsetBitRange): New function.
* src/FtpNegotiateCommand.cc
(executeInternal): Set maxDownloadSpeedLimit,
startupIdleTime, lowestDownloadSpeedLimit to command.
(recvSize): Added method "HEAD" handling.
Removed the call to
e->segmentMan->shouldCancelDownloadForSafety().
* src/AbstractSingleDiskAdaptor.cc
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/AbstractSingleDiskAdaptor.h
(sha1Sum): Renamed as messageDigest.
(messageDigest): New function.
* src/Util.h
(indexRange): New function.
* src/MetalinkEntry.cc
(MetalinkEntry): Initialized chunkChecksum to 0.
* src/ShaVisitor.cc
(~ShaVisitor): Removed the call to ctx.digestFree().
* src/SegmentMan.cc
(ChunkChecksumValidator.h): New include.
(SegmentMan): Initialized chunkHashLength to 0. Initialized
digestAlgo
to DIGEST_ALGO_SHA1.
(~SegmentMan): Removed diskWriter.
(FindSegmentEntryByIndex): Removed.
(FindSegmentEntryByCuid): Removed.
(checkoutSegment): Rewritten.
(findSlowerSegmentEntry): Rewritten.
(getSegment): Rewritten.
(updateSegment): Rewritten.
(completeSegment): Rewritten.
(markAllPiecesDone): New function.
(checkIntegrity): New function.
(isChunkChecksumValidationReady): New function.
(tryChunkChecksumValidation): New function.
* src/Xml2MetalinkProcessor.cc
(getEntry): Get size and set it to entry.
Get chunk checksum and set it to entry.
(getPieceHash): New function.
* src/Util.cc
(sha1Sum): Removed ctx.digestFree()
(fileChecksum): Removed ctx.digestFree()
(indexRange): New function.
* src/Request.cc
(METHOD_GET): New variable.
(METHOD_HEAD): New variable.
(Request): Added method.
* src/UrlRequestInfo.cc
(FatalException.h): New include.
(message.h): New include.
(operator<<): Added operator<< for class HeadResult.
(getHeadResult): New function.
(execute): Get filename and size in separate download engine.
* src/ChunkChecksumValidator.cc: New class.
* src/DownloadCommand.cc:
(DownloadCommand): Added peerStat.
(executeInternal): Use maxDownloadSpeedLimit member instead of
getting
the value from Option.
The buffer size is now 16KB.
Use peerStat member instead of getting it from SegmentMan.
Use startupIdleTime member instead of gettingit from Option.
Added chunk checksum validation.
* src/AbstractDiskWriter.cc
(AbstractDiskWriter): Removed ctx.
(~AbstractDiskWriter): Removed ctx.digestFree()
(writeDataInternal): Returns the return value of write.
(readDataInternal): Returns the return value of read.
(sha1Sum): Renamed as messageDigest
(messageDigest): New function.
* src/AbstractDiwkWriter.h
(messageDigest.h): Removed include.
(ctx): Removed.
(sha1Sum): Renamed as messageDigest
(messageDigest): New function.
* src/DefaultPieceStorage.h
(markAllPiecesDone): New function.
(checkIntegrity): New function.
* src/NullFileAllocationMonitor.h: New class.
Tatsuhiro Tsujikawa