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129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
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It is considered beerware. Prost. Skol. Cheers or whatever. */
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/* System */
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#include <sys/uio.h>
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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/* Libowfat */
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/* Opentracker */
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#include "trackerlogic.h"
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#include "ot_mutex.h"
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#include "ot_iovec.h"
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#include "ot_fullscrape.h"
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/* Fetch full scrape info for all torrents
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Full scrapes usually are huge and one does not want to
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allocate more memory. So lets get them in 1M units
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*/
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#define OT_SCRAPE_CHUNK_SIZE (512*1024)
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/* "d8:completei%zde10:downloadedi%zde10:incompletei%zdee" */
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#define OT_FULLSCRAPE_MAXENTRYLEN 100
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/* Forward declaration */
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static void fullscrape_make( int *iovec_entries, struct iovec **iovector );
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/* This is the entry point into this worker thread
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It grabs tasks from mutex_tasklist and delivers results back
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*/
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static void * fullscrape_worker( void * args) {
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int iovec_entries;
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struct iovec *iovector;
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args = args;
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while( 1 ) {
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ot_taskid taskid = mutex_workqueue_poptask( OT_TASKTYPE_FULLSCRAPE );
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fullscrape_make( &iovec_entries, &iovector );
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if( mutex_workqueue_pushresult( taskid, iovec_entries, iovector ) )
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iovec_free( &iovec_entries, &iovector );
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}
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return NULL;
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}
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void fullscrape_init( ) {
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pthread_t thread_id;
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pthread_create( &thread_id, NULL, fullscrape_worker, NULL );
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}
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void fullscrape_deliver( int64 socket ) {
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mutex_workqueue_pushtask( socket, OT_TASKTYPE_FULLSCRAPE );
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}
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static void fullscrape_make( int *iovec_entries, struct iovec **iovector ) {
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int bucket;
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char *r, *re;
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/* Setup return vector... */
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*iovec_entries = 0;
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*iovector = NULL;
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if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) )
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return;
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/* ... and pointer to end of current output buffer.
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This works as a low watermark */
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re = r + OT_SCRAPE_CHUNK_SIZE;
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/* Start reply dictionary */
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memmove( r, "d5:filesd", 9 ); r += 9;
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/* For each bucket... */
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for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
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/* Get exclusive access to that bucket */
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ot_vector *torrents_list = mutex_bucket_lock( bucket );
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size_t tor_offset;
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/* For each torrent in this bucket.. */
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for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
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/* Address torrents members */
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ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
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ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
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/* If torrent has peers or download count, its interesting */
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if( peer_list->peer_count || peer_list->down_count ) {
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/* push hash as bencoded string */
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*r++='2'; *r++='0'; *r++=':';
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memmove( r, hash, 20 ); r+=20;
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/* push rest of the scrape string */
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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 );
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}
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/* If we reached our low watermark in buffer... */
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if( re - r <= OT_FULLSCRAPE_MAXENTRYLEN ) {
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/* crop current output buffer to the amount really used */
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iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
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/* And allocate a fresh output buffer at the end of our buffers list */
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if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) ) {
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/* If this fails: free buffers */
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iovec_free( iovec_entries, iovector );
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/* Release lock on current bucket and return */
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mutex_bucket_unlock( bucket );
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return;
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}
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/* Adjust new end of output buffer */
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re = r + OT_SCRAPE_CHUNK_SIZE;
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}
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}
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/* All torrents done: release lock on currenct bucket */
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mutex_bucket_unlock( bucket );
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}
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/* Close bencoded scrape dictionary */
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*r++='e'; *r++='e';
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/* Release unused memory in current output buffer */
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iovec_fixlast( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE - ( re - r ) );
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}
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