mirror of git://erdgeist.org/opentracker
Sync-daemon written in perl to sync torrents and peers between more than one tracker entity.
cryx
18 years ago
parent
4e9523c489
commit
59ddb82838
@ -0,0 +1,291 @@
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#!/usr/bin/perl
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use strict;
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#use Convert::Bencode_XS qw(:all);
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use Convert::Bencode qw(:all);
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use Data::Dumper;
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use LWP::UserAgent;
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use URI::Escape;
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# enable verbose output
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my $debug = 0;
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# tracker from where we get our sync data
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my @trackers = ('127.0.0.1:8989');
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# tracker to upload merged data
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my @client_tracker = ('127.0.0.1:8989');
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# time to wait between syncs
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my $sleeptime = '300';
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# SSL cert and key
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my $ssl_cert = 'cert.pem';
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my $ssl_key = 'key.pem';
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foreach(@trackers) {
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print "Syncing from: $_\n";
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}
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foreach(@client_tracker) {
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print "Syncing to: $_\n";
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}
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my $file = shift;
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# global hash for storing the merged syncs
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my %merged_syncs;
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while(1) {
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%merged_syncs;
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my @bencoded_sync_data;
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# fetch the sync from every tracker and put it into an array in bencoded form
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foreach my $tracker (@trackers) {
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my $bencoded_sync = fetch_sync($tracker);
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# my $bencoded_sync = fetch_sync_from_file($file);
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if($bencoded_sync ne 0 && $bencoded_sync =~ /^d4\:sync/) {
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push(@bencoded_sync_data,$bencoded_sync);
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}
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}
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# bdecode every sync and throw it into the merged-sync
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foreach my $bencoded_sync (@bencoded_sync_data) {
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print "Doing merge...\n";
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merge_sync(bdecode($bencoded_sync));
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my $num_torrents = keys(%merged_syncs);
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print "number of torrents: $num_torrents\n";
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}
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# number of max. peers in one changeset
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my $peer_limit = 500;
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# max number of changesets per commit
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my $max_changesets = 10;
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my $hash_count = 0;
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my $peer_count = 0;
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my $changeset;
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my @escaped_changesets;
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# run until all hashes are put into changesets and commited to the trackers
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while(keys(%merged_syncs) != 0) {
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foreach my $hash (keys(%merged_syncs)) {
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print "Starting new changeset\n" if($peer_count == 0 && $debug);
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my $num_peers = keys(%{$merged_syncs{$hash}});
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print "\t$peer_count peers for $hash_count hashes in changeset\n" if($debug);
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my $pack_hash = pack('H*',$hash);
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# as long as the peer_limit is not reached, add new hashes with peers to the changeset hash-table
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if($peer_count < $peer_limit) {
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print "\t\tAdd $num_peers peers for $hash changeset\n" if($debug);
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$peer_count = $peer_count + $num_peers;
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foreach my $peer_socket (keys(%{$merged_syncs{$hash}})) {
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my $flags = $merged_syncs{$hash}{$peer_socket};
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print "\t\t\tAdd $peer_socket $flags\n" if($debug);
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my $pack_peer = packme($peer_socket,$flags);
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$changeset->{'sync'}->{$pack_hash} = $changeset->{'sync'}->{$pack_hash}.$pack_peer;
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}
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$hash_count++;
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# hash is stored in the changeset, delete it from the hash-table
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delete $merged_syncs{$hash};
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}
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# the peer_limit is reached or we are out of torrents, so start preparing a changeset
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if($peer_count >= $peer_limit || keys(%merged_syncs) == 0) {
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print "Commit changeset for $hash_count hashes with $peer_count peers total\n" if($debug);
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# bencode the changeset
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my $enc_changeset = bencode($changeset);
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# URL-escape the changeset and put into an array of changesets
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my $foobar = uri_escape($enc_changeset);
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push(@escaped_changesets,$foobar);
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# the changeset is ready and stored, so delete it from the changeset hash-table
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delete $changeset->{'sync'};
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$hash_count = 0;
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$peer_count = 0;
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print "\n\n\n" if($debug);
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}
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# if enought changesets are prepared or we are out of torrents for more changesets,
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# sync the changesets to the trackers
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if($#escaped_changesets == $max_changesets || keys(%merged_syncs) == 0) {
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print "\tSync...\n";
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sync_to_tracker(\@escaped_changesets);
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undef @escaped_changesets;
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}
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}
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}
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print "Sleeping for $sleeptime seconds\n";
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sleep $sleeptime;
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}
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sub connect_tracker {
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# connect a tracker via HTTPS, returns the body of the response
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my $url = shift;
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$ENV{HTTPS_DEBUG} = 0;
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$ENV{HTTPS_CERT_FILE} = $ssl_cert;
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$ENV{HTTPS_KEY_FILE} = $ssl_key;
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my $ua = new LWP::UserAgent;
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my $req = new HTTP::Request('GET', $url);
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my $res = $ua->request($req);
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my $content = $res->content;
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if($res->is_success()) {
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return $content;
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} else {
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print $res->code."|".$res->status_line."\n";
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return 0;
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}
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}
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sub sync_to_tracker {
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# commit changesets to a tracker
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my @changesets = @{(shift)};
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# prepare the URI with URL-encoded changesets concatenated by a &
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my $uri = 'sync?';
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foreach my $set (@changesets) {
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$uri .= 'changeset='.$set.'&';
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}
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my $uri_length = length($uri);
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# commit the collection of changesets to the tracker via HTTPS
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foreach my $tracker (@client_tracker) {
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print "\t\tTracker: $tracker (URI: $uri_length)\n";
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my $url = "https://$tracker/".$uri;
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connect_tracker($url);
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}
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}
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sub packme {
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# pack data
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# returns ipaddr, port and flags in packed format
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my $peer_socket = shift;
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my $flags = shift;
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my($a,$b,$c,$d,$port) = split(/[\.,\:]/,$peer_socket);
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my $pack_peer = pack('C4 n1 b16',$a,$b,$c,$d,$port,$flags);
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return $pack_peer;
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}
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sub unpackme {
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# unpack packed data
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# returns ipaddr. in quad-form with port (a.b.c.d:port) and flags as bitfield
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# data is packed as:
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# - 4 byte ipaddr. (unsigned char value)
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# - 2 byte port (unsigned short in "network" (big-endian) order)
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# - 2 byte flags (bit string (ascending bit order inside each byte))
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my $data = shift;
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my($a, $b, $c, $d, $port, $flags) = unpack('C4 n1 b16',$data);
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my $peer_socket = "$a\.$b\.$c\.$d\:$port";
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return($peer_socket,$flags);
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}
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sub fetch_sync {
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# fetch sync from a tracker
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my $tracker = shift;
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my $url = "https://$tracker/sync";
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print "Fetching from $url\n";
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my $body = connect_tracker($url);
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if($body && $body =~ /^d4\:sync/) {
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return $body;
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} else {
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return 0;
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}
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}
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sub fetch_sync_from_file {
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# fetch sync from a file
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my $file = shift;
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my $body;
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print "Fetching from file $file\n";
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open(FILE,"<$file");
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while(<FILE>) {
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$body .= $_;
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}
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close(FILE);
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return $body;
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}
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sub merge_sync {
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# This builds a hash table with the torrenthash as keys. The value is a hash table again with the peer-socket as keys
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# and flags in the value
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# Example:
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# 60dd2beb4197f71677c0f5ba92b956f7d04651e5 =>
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# 192.168.23.23:2323 => 0000000000000000
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# 23.23.23.23:2342 => 0000000100000000
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# b220b4d7136e84a88abc090db88bec8604a808f3 =>
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# 42.23.42.23:55555 => 0000000000000000
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my $hashref = shift;
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my $nonuniq_hash_counter = 0;
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my $nonuniq_peer_counter = 0;
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my $hash_counter = 0;
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my $peer_counter = 0;
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foreach my $key (keys(%{$hashref->{'sync'}})) {
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# start merge for every sha1-hash in the sync
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my $hash = unpack('H*',$key);
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$hash_counter++;
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$nonuniq_hash_counter++ if exists $merged_syncs{$hash};
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while(${$hashref->{'sync'}}{$key} ne "")
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{
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# split the value into 8-byte and unpack it for getting peer-socket and flags
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my($peer_socket,$flags) = unpackme(substr(${$hashref->{'sync'}}{$key},0,8,''));
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$peer_counter++;
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$nonuniq_peer_counter++ if exists $merged_syncs{$hash}{$peer_socket};
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# Create a hash table with sha1-hash as key and a hash table as value.
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# The hash table in the value has the peer-socket as key and flags as value
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# If the entry already exists, the flags are ORed together, if not it is ORed with 0
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$merged_syncs{$hash}{$peer_socket} = $flags | $merged_syncs{$hash}{$peer_socket};
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}
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}
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print "$hash_counter hashes $nonuniq_hash_counter non-uniq, $peer_counter peers $nonuniq_peer_counter non-uniq.\n";
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}
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sub test_decode {
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my $hashref = shift;
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print "CHANGESET DEBUG OUTPUT\n";
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print Dumper $hashref;
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foreach my $key (keys(%{$hashref->{'sync'}})) {
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my $hash = unpack('H*',$key);
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print "Changeset for $hash\n";
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while(${$hashref->{'sync'}}{$key} ne "")
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{
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my($peer_socket,$flags) = unpackme(substr(${$hashref->{'sync'}}{$key},0,8,''));
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print "\tSocket: $peer_socket Flags: $flags\n";
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}
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}
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}
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