transmission/libtransmission/webseed.c

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/*
* This file Copyright (C) 2008 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <string.h> /* strlen */
#include <event.h>
#include "transmission.h"
#include "inout.h"
#include "list.h"
#include "ratecontrol.h"
#include "torrent.h"
#include "utils.h"
#include "web.h"
#include "webseed.h"
#define MAX_QUEUE_SIZE 4
struct tr_webseed
{
unsigned int dead : 1;
tr_torrent * torrent;
char * url;
tr_delivery_func * callback;
void * callback_userdata;
uint64_t bytesSaved;
tr_piece_index_t queue[MAX_QUEUE_SIZE];
int queueSize;
tr_ratecontrol * rateDown;
struct evbuffer * content;
};
/***
****
***/
static const tr_peer_event blankEvent = { 0, 0, 0, 0, 0.0f, 0 };
static void
publish( tr_webseed * w, tr_peer_event * e )
{
if( w->callback )
w->callback( NULL, e, w->callback_userdata );
}
static void
fireNeedReq( tr_webseed * w )
{
tr_peer_event e = blankEvent;
e.eventType = TR_PEER_NEED_REQ;
publish( w, &e );
}
static void
fireClientGotBlock( tr_webseed * w, uint32_t pieceIndex, uint32_t offset, uint32_t length )
{
tr_peer_event e = blankEvent;
e.eventType = TR_PEER_CLIENT_GOT_BLOCK;
e.pieceIndex = pieceIndex;
e.offset = offset;
e.length = length;
publish( w, &e );
}
static void
fireClientGotData( tr_webseed * w, uint32_t length )
{
tr_peer_event e = blankEvent;
e.eventType = TR_PEER_CLIENT_GOT_DATA;
e.length = length;
publish( w, &e );
}
/***
****
***/
static char*
makeURL( tr_webseed * w, const tr_file * file )
{
char * ret;
struct evbuffer * out = evbuffer_new( );
const char * url = w->url;
const size_t url_len = strlen( url );
evbuffer_add( out, url, url_len );
/* if url ends with a '/', add the torrent name */
if( url[url_len-1] == '/' )
{
const char * str = file->name;
/* this is like curl_escape() but doesn't munge the
* '/' directory separators in the path */
while( str && *str )
{
switch( *str ) {
case ',': case '-': case '.': case '/':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
evbuffer_add( out, str, 1 );
break;
default:
evbuffer_add_printf( out, "%%%02X", *str );
break;
}
}
}
ret = tr_strndup( EVBUFFER_DATA( out ), EVBUFFER_LENGTH( out ) );
evbuffer_free( out );
return ret;
}
static void requestNextChunk( tr_webseed * w );
static void
webResponseFunc( tr_handle * session UNUSED,
long response_code,
const void * response,
size_t response_byte_count,
void * vw )
{
tr_webseed * w = vw;
const int success = ( response_code == 206 );
/*fprintf( stderr, "server responded with code %ld and %lu bytes\n", response_code, (unsigned long)response_byte_count );*/
if( !success )
{
/* FIXME */
}
else if( w->dead )
{
tr_webseedFree( w );
}
else
{
const tr_piece_index_t piece = w->queue[0];
tr_block_index_t block;
size_t len;
evbuffer_add( w->content, response, response_byte_count );
fireClientGotData( w, response_byte_count );
block = _tr_block( w->torrent, piece, w->bytesSaved );
len = tr_torBlockCountBytes( w->torrent, block );
while( EVBUFFER_LENGTH( w->content ) >= len )
{
/*fprintf( stderr, "saving piece index %lu, offset %lu, len %lu\n", (unsigned long)piece, (unsigned long)w->bytesSaved, (unsigned long)len );*/
/* save one block */
tr_ioWrite( w->torrent, piece, w->bytesSaved, len,
EVBUFFER_DATA(w->content) );
evbuffer_drain( w->content, len );
tr_rcTransferred( w->rateDown, len );
fireClientGotBlock( w, piece, w->bytesSaved, len );
w->bytesSaved += len;
/* march to the next one */
++block;
len = tr_torBlockCountBytes( w->torrent, block );
}
if( w->bytesSaved < tr_torPieceCountBytes( w->torrent, piece ) )
requestNextChunk( w );
else {
w->bytesSaved = 0;
evbuffer_drain( w->content, EVBUFFER_LENGTH( w->content ) );
/*fprintf( stderr, "w->callback_userdata is %p\n", w->callback_userdata );*/
memmove( w->queue, w->queue+1, sizeof(tr_piece_index_t)*(MAX_QUEUE_SIZE-1) );
/*fprintf( stderr, "w->callback_userdata is %p\n", w->callback_userdata );*/
if( --w->queueSize )
requestNextChunk( w );
if( w->queueSize < ( MAX_QUEUE_SIZE / 2 ) )
fireNeedReq( w );
}
}
}
static void
requestNextChunk( tr_webseed * w )
{
const tr_info * inf = tr_torrentInfo( w->torrent );
const uint32_t have = w->bytesSaved + EVBUFFER_LENGTH( w->content );
const tr_piece_index_t piece = w->queue[0];
const uint32_t left = tr_torPieceCountBytes( w->torrent, piece ) - have;
const uint32_t pieceOffset = have;
tr_file_index_t fileIndex;
uint64_t fileOffset;
uint32_t thisPass;
char * url;
char * range;
tr_ioFindFileLocation( w->torrent, piece, pieceOffset,
&fileIndex, &fileOffset );
thisPass = MIN( left, inf->files[fileIndex].length - fileOffset );
url = makeURL( w, &inf->files[fileIndex] );
range = tr_strdup_printf( "%"PRIu64"-%"PRIu64, fileOffset, fileOffset + thisPass - 1 );
/*fprintf( stderr, "range is [%s] ... we want %lu total, we have %lu, so %lu are left, and we're asking for %lu this time\n", range, (unsigned long)tr_torPieceCountBytes(w->torrent,piece), (unsigned long)have, (unsigned long)left, (unsigned long)thisPass );*/
tr_webRun( w->torrent->handle, url, range, webResponseFunc, w );
tr_free( range );
tr_free( url );
}
int
tr_webseedAddRequest( tr_webseed * w,
tr_piece_index_t piece )
{
int ret;
if( w->dead || w->queueSize >= MAX_QUEUE_SIZE )
{
ret = TR_ADDREQ_FULL;
}
else
{
int wasEmpty = w->queueSize == 0;
w->queue[ w->queueSize++ ] = piece;
if( wasEmpty )
requestNextChunk( w );
ret = TR_ADDREQ_OK;
}
return ret;
}
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int
tr_webseedIsActive( const tr_webseed * w )
{
return w->queueSize > 0;
}
int
tr_webseedGetSpeed( const tr_webseed * w ,
float * setme_KiBs )
{
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const int isActive = tr_webseedIsActive( w );
*setme_KiBs = isActive ? tr_rcRate( w->rateDown ) : 0.0f;
return isActive;
}
/***
****
***/
tr_webseed*
tr_webseedNew( struct tr_torrent * torrent,
const char * url,
tr_delivery_func callback,
void * callback_userdata )
{
tr_webseed * w = tr_new0( tr_webseed, 1 );
w->content = evbuffer_new( );
w->rateDown = tr_rcInit( );
w->torrent = torrent;
w->url = tr_strdup( url );
w->callback = callback;
w->callback_userdata = callback_userdata;
/*fprintf( stderr, "w->callback_userdata is %p\n", w->callback_userdata );*/
return w;
}
void
tr_webseedFree( tr_webseed * w )
{
if( w )
{
if( w->queueSize > 0 )
{
w->dead = 1;
}
else
{
evbuffer_free( w->content );
tr_rcClose( w->rateDown );
tr_free( w->url );
tr_free( w );
}
}
}