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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever. */
/* System */
#include <sys/uio.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <arpa/inet.h>
#ifdef WANT_COMPRESSION_GZIP
#include <zlib.h>
#endif
/* Libowfat */
#include "byte.h"
#include "textcode.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_iovec.h"
#include "ot_fullscrape.h"
/* Fetch full scrape info for all torrents
Full scrapes usually are huge and one does not want to
allocate more memory. So lets get them in 512k units
*/
#define OT_SCRAPE_CHUNK_SIZE (1024)
/* "d8:completei%zde10:downloadedi%zde10:incompletei%zdee" */
#define OT_SCRAPE_MAXENTRYLEN 256
#ifdef WANT_COMPRESSION_GZIP
#define IF_COMPRESSION( TASK ) if( mode & TASK_FLAG_GZIP ) TASK
#define WANT_COMPRESSION_GZIP_PARAM( param1, param2 ) , param1, param2
#else
#define IF_COMPRESSION( TASK )
#define WANT_COMPRESSION_GZIP_PARAM( param1, param2 )
#endif
/* Forward declaration */
static void fullscrape_make( int *iovec_entries, struct iovec **iovector, ot_tasktype mode );
/* Converter function from memory to human readable hex strings
XXX - Duplicated from ot_stats. Needs fix. */
static char*to_hex(char*d,ot_byte*s){char*m="0123456789ABCDEF";char *t=d;char*e=d+40;while(d<e){*d++=m[*s>>4];*d++=m[*s++&15];}*d=0;return t;}
/* This is the entry point into this worker thread
It grabs tasks from mutex_tasklist and delivers results back
*/
static void * fullscrape_worker( void * args) {
int iovec_entries;
struct iovec *iovector;
args = args;
while( 1 ) {
ot_tasktype tasktype = TASK_FULLSCRAPE;
ot_taskid taskid = mutex_workqueue_poptask( &tasktype );
fullscrape_make( &iovec_entries, &iovector, tasktype );
if( mutex_workqueue_pushresult( taskid, iovec_entries, iovector ) )
iovec_free( &iovec_entries, &iovector );
}
return NULL;
}
static pthread_t thread_id;
void fullscrape_init( ) {
pthread_create( &thread_id, NULL, fullscrape_worker, NULL );
}
void fullscrape_deinit( ) {
pthread_cancel( thread_id );
}
void fullscrape_deliver( int64 socket, ot_tasktype tasktype ) {
mutex_workqueue_pushtask( socket, tasktype );
}
static int fullscrape_increase( int *iovec_entries, struct iovec **iovector,
char **r, char **re WANT_COMPRESSION_GZIP_PARAM( z_stream *strm, ot_tasktype mode ) ) {
/* Allocate a fresh output buffer at the end of our buffers list */
if( !( *r = iovec_fix_increase_or_free( iovec_entries, iovector, *r, OT_SCRAPE_CHUNK_SIZE ) ) ) {
/* Deallocate gzip buffers */
IF_COMPRESSION( deflateEnd(strm); )
/* Release lock on current bucket and return */
return -1;
}
/* Adjust new end of output buffer */
*re = *r + OT_SCRAPE_CHUNK_SIZE - OT_SCRAPE_MAXENTRYLEN;
/* When compressing, we have all the bytes in output buffer */
IF_COMPRESSION( { \
*re -= OT_SCRAPE_MAXENTRYLEN; \
strm->next_out = (ot_byte*)*r; \
strm->avail_out = OT_SCRAPE_CHUNK_SIZE; \
deflate( strm, Z_NO_FLUSH ); \
*r = (char*)strm->next_out; \
} )
return 0;
}
static void fullscrape_make( int *iovec_entries, struct iovec **iovector, ot_tasktype mode ) {
int bucket;
char *r, *re;
#ifdef WANT_COMPRESSION_GZIP
char compress_buffer[OT_SCRAPE_MAXENTRYLEN];
z_stream strm;
#endif
/* Setup return vector... */
*iovec_entries = 0;
*iovector = NULL;
if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) )
return;
/* re points to low watermark */
re = r + OT_SCRAPE_CHUNK_SIZE - OT_SCRAPE_MAXENTRYLEN;
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
re += OT_SCRAPE_MAXENTRYLEN;
byte_zero( &strm, sizeof(strm) );
strm.next_in = (ot_byte*)compress_buffer;
strm.next_out = (ot_byte*)r;
strm.avail_out = OT_SCRAPE_CHUNK_SIZE;
if( deflateInit2(&strm,9,Z_DEFLATED,31,8,Z_DEFAULT_STRATEGY) != Z_OK )
fprintf( stderr, "not ok.\n" );
r = compress_buffer;
}
#endif
if( ( mode & TASK_TASK_MASK ) == TASK_FULLSCRAPE )
r += sprintf( r, "d5:filesd" );
/* For each bucket... */
for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
/* Get exclusive access to that bucket */
ot_vector *torrents_list = mutex_bucket_lock( bucket );
size_t tor_offset;
/* For each torrent in this bucket.. */
for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
/* Address torrents members */
ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
switch( mode & TASK_TASK_MASK ) {
case TASK_FULLSCRAPE:
default:
/* push hash as bencoded string */
*r++='2'; *r++='0'; *r++=':';
memmove( r, hash, 20 ); r+=20;
/* push rest of the scrape string */
r += sprintf( r, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", peer_list->seed_count, peer_list->down_count, peer_list->peer_count-peer_list->seed_count );
break;
case TASK_FULLSCRAPE_TPB_ASCII:
to_hex( r, *hash ); r+=40;
r += sprintf( r, ":%zd:%zd\n", peer_list->seed_count, peer_list->peer_count-peer_list->seed_count );
break;
case TASK_FULLSCRAPE_TPB_BINARY:
memmove( r, hash, 20 ); r+=20;
*(ot_dword*)r++ = htonl( (uint32_t)peer_list->seed_count );
*(ot_dword*)r++ = htonl( (uint32_t)( peer_list->peer_count-peer_list->seed_count) );
break;
case TASK_FULLSCRAPE_TPB_URLENCODED:
r += fmt_urlencoded( r, (char *)*hash, 20 );
r += sprintf( r, ":%zd:%zd\n", peer_list->seed_count, peer_list->peer_count-peer_list->seed_count );
break;
}
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
strm.next_in = (ot_byte*)compress_buffer;
strm.avail_in = r - compress_buffer;
deflate( &strm, Z_NO_FLUSH );
r = (char*)strm.next_out;
}
#endif
/* Check if there still is enough buffer left */
while( ( r > re ) && fullscrape_increase( iovec_entries, iovector, &r, &re WANT_COMPRESSION_GZIP_PARAM( &strm, mode ) ) )
return mutex_bucket_unlock( bucket );
IF_COMPRESSION( r = compress_buffer; )
}
/* All torrents done: release lock on currenct bucket */
mutex_bucket_unlock( bucket );
}
if( ( mode & TASK_TASK_MASK ) == TASK_FULLSCRAPE )
r += sprintf( r, "ee" );
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
strm.next_in = (ot_byte*)compress_buffer;
strm.avail_in = r - compress_buffer;
deflate( &strm, Z_FINISH );
r = (char*)strm.next_out;
while( ( r > re ) && fullscrape_increase( iovec_entries, iovector, &r, &re WANT_COMPRESSION_GZIP_PARAM( &strm, mode ) ) )
return mutex_bucket_unlock( bucket );
deflateEnd(&strm);
}
#endif
/* Release unused memory in current output buffer */
iovec_fixlast( iovec_entries, iovector, r );
}
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