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Some in code documentation to make Denis happy :)

master
Dirk Engling 14 years ago
parent
commit
6cfb756fc3
  1. 42
      ot_fullscrape.c

42
ot_fullscrape.c

@ -25,43 +25,75 @@
size_t return_fullscrape_for_tracker( int *iovec_entries, struct iovec **iovector ) {
int bucket;
size_t j;
char *r, *re;
/* Setup return vector */
*iovec_entries = 0;
if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) )
return 0;
/* ... and pointer end of current output buffer
this works as a low watermark */
re = r + OT_SCRAPE_CHUNK_SIZE;
/* Start reply dictionary */
memmove( r, "d5:filesd", 9 ); r += 9;
/* 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 );
for( j=0; j<torrents_list->size; ++j ) {
ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[j] ).peer_list;
ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[j] ).hash;
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;
/* If torrent has peers or download count, its interesting */
if( peer_list->peer_count || peer_list->down_count ) {
/* 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 );
}
/* If we reached our low watermark in buffer... */
if( re - r <= OT_FULLSCRAPE_MAXENTRYLEN ) {
/* crop current output buffer to the amount really used */
iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
/* And allocate a fresh output buffer at the end of our buffers list */
if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) ) {
/* If this fails: free buffers */
iovec_free( iovec_entries, iovector );
/* Release lock on current bucket and return */
mutex_bucket_unlock( bucket );
return 0;
}
/* Adjust new end of output buffer */
re = r + OT_SCRAPE_CHUNK_SIZE;
}
}
/* All torrents done: release lock on currenct bucket */
mutex_bucket_unlock( bucket );
}
/* Close bencoded scrape dictionary */
*r++='e'; *r++='e';
/* Release unused memory in current output buffer */
iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
/* Return answer size */
return iovec_length( iovec_entries, iovector );
}

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