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@ -35,7 +35,7 @@ char groupip_1[4] = { 224,0,23,5 };
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#define LIVESYNC_MAXDELAY 15 /* seconds */
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enum { OT_SYNC_PEER };
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enum { OT_SYNC_PEER4, OT_SYNC_PEER6 };
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/* Forward declaration */
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static void * livesync_worker( void * args );
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@ -47,9 +47,14 @@ static int64 g_socket_in = -1;
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static int64 g_socket_out = -1;
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static pthread_mutex_t g_outbuf_mutex = PTHREAD_MUTEX_INITIALIZER;
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char g_outbuf[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
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static size_t g_outbuf_data;
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static ot_time g_next_packet_time;
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typedef struct {
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uint8_t data[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
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size_t fill;
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ot_time next_packet_time;
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} sync_buffer;
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static sync_buffer g_v6_buf;
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static sync_buffer g_v4_buf;
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static pthread_t thread_id;
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void livesync_init( ) {
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@ -58,11 +63,17 @@ void livesync_init( ) {
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exerr( "No socket address for live sync specified." );
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/* Prepare outgoing peers buffer */
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memcpy( g_outbuf, &g_tracker_id, sizeof( g_tracker_id ) );
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uint32_pack_big( g_outbuf + sizeof( g_tracker_id ), OT_SYNC_PEER);
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g_outbuf_data = sizeof( g_tracker_id ) + sizeof( uint32_t );
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memcpy( g_v6_buf.data, &g_tracker_id, sizeof( g_tracker_id ) );
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memcpy( g_v4_buf.data, &g_tracker_id, sizeof( g_tracker_id ) );
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uint32_pack_big( (char*)g_v6_buf.data + sizeof( g_tracker_id ), OT_SYNC_PEER6);
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uint32_pack_big( (char*)g_v4_buf.data + sizeof( g_tracker_id ), OT_SYNC_PEER4);
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g_v6_buf.fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
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g_v4_buf.fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
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g_next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
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g_v6_buf.next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
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g_v4_buf.next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
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pthread_create( &thread_id, NULL, livesync_worker, NULL );
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}
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@ -107,28 +118,28 @@ void livesync_bind_mcast( ot_ip6 ip, uint16_t port) {
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}
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/* Caller MUST hold g_outbuf_mutex. Returns with g_outbuf_mutex unlocked */
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static void livesync_issue_peersync( ) {
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static void livesync_issue_peersync( sync_buffer *buf ) {
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char mycopy[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
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size_t data = g_outbuf_data;
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size_t fill = buf->fill;
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memcpy( mycopy, g_outbuf, data );
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g_outbuf_data = sizeof( g_tracker_id ) + sizeof( uint32_t );
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g_next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
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memcpy( mycopy, buf->data, fill );
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buf->fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
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buf->next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
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/* From now this thread has a local copy of the buffer and
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has modified the protected element */
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pthread_mutex_unlock(&g_outbuf_mutex);
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socket_send4(g_socket_out, mycopy, data, groupip_1, LIVESYNC_PORT);
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socket_send4(g_socket_out, mycopy, fill, groupip_1, LIVESYNC_PORT);
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}
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static void livesync_handle_peersync( struct ot_workstruct *ws ) {
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int off = sizeof( g_tracker_id ) + sizeof( uint32_t );
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static void livesync_handle_peersync( struct ot_workstruct *ws, size_t peer_size ) {
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size_t off = sizeof( g_tracker_id ) + sizeof( uint32_t );
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/* Now basic sanity checks have been done on the live sync packet
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We might add more testing and logging. */
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while( off + (ssize_t)sizeof( ot_hash ) + OT_PEER_SIZE4 <= ws->request_size ) {
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memcpy( &ws->peer, ws->request + off + sizeof(ot_hash), OT_PEER_SIZE4 );
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while( (ssize_t)(off + sizeof( ot_hash ) + peer_size) <= ws->request_size ) {
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memcpy( &ws->peer, ws->request + off + sizeof(ot_hash), peer_size );
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ws->hash = (ot_hash*)(ws->request + off);
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if( !g_opentracker_running ) return;
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@ -138,12 +149,12 @@ static void livesync_handle_peersync( struct ot_workstruct *ws ) {
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else
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add_peer_to_torrent_and_return_peers( FLAG_MCA, ws, /* amount = */ 0 );
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off += sizeof( ot_hash ) + sizeof( ot_peer );
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off += sizeof( ot_hash ) + peer_size;
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}
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stats_issue_event(EVENT_SYNC, 0,
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(ws->request_size - sizeof( g_tracker_id ) - sizeof( uint32_t ) ) /
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((ssize_t)sizeof( ot_hash ) + OT_PEER_SIZE4));
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((ssize_t)sizeof( ot_hash ) + peer_size));
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}
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/* Tickle the live sync module from time to time, so no events get
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@ -152,24 +163,36 @@ static void livesync_handle_peersync( struct ot_workstruct *ws ) {
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void livesync_ticker( ) {
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/* livesync_issue_peersync sets g_next_packet_time */
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pthread_mutex_lock(&g_outbuf_mutex);
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if( g_now_seconds > g_next_packet_time &&
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g_outbuf_data > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
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livesync_issue_peersync();
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if( g_now_seconds > g_v6_buf.next_packet_time &&
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g_v6_buf.fill > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
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livesync_issue_peersync(&g_v6_buf);
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else
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pthread_mutex_unlock(&g_outbuf_mutex);
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pthread_mutex_lock(&g_outbuf_mutex);
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if( g_now_seconds > g_v4_buf.next_packet_time &&
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g_v4_buf.fill > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
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livesync_issue_peersync(&g_v4_buf);
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else
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pthread_mutex_unlock(&g_outbuf_mutex);
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}
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/* Inform live sync about whats going on. */
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void livesync_tell( struct ot_workstruct *ws ) {
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size_t peer_size; /* initialized in next line */
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ot_peer *peer_src = peer_from_peer6(&ws->peer, &peer_size);
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sync_buffer *dest_buf = peer_size == OT_PEER_SIZE6 ? &g_v6_buf : &g_v4_buf;
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pthread_mutex_lock(&g_outbuf_mutex);
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memcpy( g_outbuf + g_outbuf_data, ws->hash, sizeof(ot_hash) );
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memcpy( g_outbuf + g_outbuf_data + sizeof(ot_hash), &ws->peer, OT_PEER_SIZE4 );
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memcpy( dest_buf->data + dest_buf->fill, ws->hash, sizeof(ot_hash) );
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dest_buf->fill += sizeof(ot_hash);
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g_outbuf_data += sizeof(ot_hash) + OT_PEER_SIZE4;
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memcpy( dest_buf->data + dest_buf->fill, peer_src, peer_size );
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dest_buf->fill += peer_size;
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if( g_outbuf_data >= LIVESYNC_OUTGOING_BUFFSIZE_PEERS - LIVESYNC_OUTGOING_WATERMARK_PEERS )
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livesync_issue_peersync();
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if( dest_buf->fill >= LIVESYNC_OUTGOING_BUFFSIZE_PEERS - LIVESYNC_OUTGOING_WATERMARK_PEERS )
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livesync_issue_peersync(dest_buf);
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else
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pthread_mutex_unlock(&g_outbuf_mutex);
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}
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@ -200,8 +223,11 @@ static void * livesync_worker( void * args ) {
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}
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switch( uint32_read_big( sizeof( g_tracker_id ) + (char *)ws.inbuf ) ) {
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case OT_SYNC_PEER:
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livesync_handle_peersync( &ws );
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case OT_SYNC_PEER6:
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livesync_handle_peersync( &ws, OT_PEER_SIZE6 );
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break;
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case OT_SYNC_PEER4:
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livesync_handle_peersync( &ws, OT_PEER_SIZE4 );
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break;
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default:
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break;
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