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Sync-daemon written in perl to sync torrents and peers between more than one tracker entity.

master
Philipp Wuensche 14 years ago
parent
commit
83ea281b67
  1. 291
      sync_daemon.pl

291
sync_daemon.pl

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