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