| 1 |
=head1 NAME |
| 2 |
|
| 3 |
AnyEvent::FCP - freenet client protocol 2.0 |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use AnyEvent::FCP; |
| 8 |
|
| 9 |
my $fcp = new AnyEvent::FCP; |
| 10 |
|
| 11 |
# transactions return condvars |
| 12 |
my $lp_cv = $fcp->list_peers; |
| 13 |
my $pr_cv = $fcp->list_persistent_requests; |
| 14 |
|
| 15 |
my $peers = $lp_cv->recv; |
| 16 |
my $reqs = $pr_cv->recv; |
| 17 |
|
| 18 |
=head1 DESCRIPTION |
| 19 |
|
| 20 |
This module implements the freenet client protocol version 2.0, as used by |
| 21 |
freenet 0.7. See L<Net::FCP> for the earlier freenet 0.5 version. |
| 22 |
|
| 23 |
See L<http://wiki.freenetproject.org/FreenetFCPSpec2Point0> for a |
| 24 |
description of what the messages do. |
| 25 |
|
| 26 |
The module uses L<AnyEvent> to find a suitable event module. |
| 27 |
|
| 28 |
Only very little is implemented, ask if you need more, and look at the |
| 29 |
example program later in this section. |
| 30 |
|
| 31 |
=head2 EXAMPLE |
| 32 |
|
| 33 |
This example fetches the download list and sets the priority of all files |
| 34 |
with "a" in their name to "emergency": |
| 35 |
|
| 36 |
use AnyEvent::FCP; |
| 37 |
|
| 38 |
my $fcp = new AnyEvent::FCP; |
| 39 |
|
| 40 |
$fcp->watch_global (1, 0); |
| 41 |
my $req = $fcp->list_persistent_requests; |
| 42 |
|
| 43 |
TODO |
| 44 |
for my $req (values %$req) { |
| 45 |
if ($req->{filename} =~ /a/) { |
| 46 |
$fcp->modify_persistent_request (1, $req->{identifier}, undef, 0); |
| 47 |
} |
| 48 |
} |
| 49 |
|
| 50 |
=head2 IMPORT TAGS |
| 51 |
|
| 52 |
Nothing much can be "imported" from this module right now. |
| 53 |
|
| 54 |
=head1 THE AnyEvent::FCP CLASS |
| 55 |
|
| 56 |
=over 4 |
| 57 |
|
| 58 |
=cut |
| 59 |
|
| 60 |
package AnyEvent::FCP; |
| 61 |
|
| 62 |
use common::sense; |
| 63 |
|
| 64 |
use Carp; |
| 65 |
|
| 66 |
our $VERSION = 0.4; |
| 67 |
|
| 68 |
use Scalar::Util (); |
| 69 |
|
| 70 |
use AnyEvent; |
| 71 |
use AnyEvent::Handle; |
| 72 |
use AnyEvent::Util (); |
| 73 |
|
| 74 |
our %TOLC; # tolc cache |
| 75 |
|
| 76 |
sub touc($) { |
| 77 |
local $_ = shift; |
| 78 |
1 while s/((?:^|_)(?:svk|chk|uri|fcp|ds|mime|dda)(?:_|$))/\U$1/; |
| 79 |
s/(?:^|_)(.)/\U$1/g; |
| 80 |
$_ |
| 81 |
} |
| 82 |
|
| 83 |
sub tolc($) { |
| 84 |
local $_ = shift; |
| 85 |
1 while s/(SVK|CHK|URI|FCP|DS|MIME|DDA)([^_])/$1\_$2/; |
| 86 |
1 while s/([^_])(SVK|CHK|URI|FCP|DS|MIME|DDA)/$1\_$2/; |
| 87 |
s/(?<=[a-z])(?=[A-Z])/_/g; |
| 88 |
lc |
| 89 |
} |
| 90 |
|
| 91 |
=item $fcp = new AnyEvent::FCP [host => $host][, port => $port][, name => $name] |
| 92 |
|
| 93 |
Create a new FCP connection to the given host and port (default |
| 94 |
127.0.0.1:9481, or the environment variables C<FREDHOST> and C<FREDPORT>). |
| 95 |
|
| 96 |
If no C<name> was specified, then AnyEvent::FCP will generate a |
| 97 |
(hopefully) unique client name for you. |
| 98 |
|
| 99 |
=cut |
| 100 |
|
| 101 |
sub new { |
| 102 |
my $class = shift; |
| 103 |
|
| 104 |
my $rand = join "", map chr 0x21 + rand 94, 1..40; # ~ 262 bits entropy |
| 105 |
|
| 106 |
my $self = bless { |
| 107 |
host => $ENV{FREDHOST} || "127.0.0.1", |
| 108 |
port => $ENV{FREDPORT} || 9481, |
| 109 |
timeout => 3600 * 2, |
| 110 |
keepalive => 9 * 60, |
| 111 |
name => time.rand.rand.rand, # lame |
| 112 |
@_, |
| 113 |
queue => [], |
| 114 |
req => {}, |
| 115 |
prefix => "..:aefcpid:$rand:", |
| 116 |
idseq => "a0", |
| 117 |
}, $class; |
| 118 |
|
| 119 |
{ |
| 120 |
Scalar::Util::weaken (my $self = $self); |
| 121 |
|
| 122 |
$self->{kw} = AE::timer $self->{keepalive}, $self->{keepalive}, sub { |
| 123 |
$self->{hdl}->push_write ("\n"); |
| 124 |
}; |
| 125 |
|
| 126 |
our $ENDMESSAGE = qr<\012(EndMessage|Data)\012>; |
| 127 |
|
| 128 |
# these are declared here for performance reasons |
| 129 |
my ($k, $v, $type); |
| 130 |
my $rdata; |
| 131 |
|
| 132 |
my $on_read = sub { |
| 133 |
my ($hdl) = @_; |
| 134 |
|
| 135 |
# we only carve out whole messages here |
| 136 |
while ($hdl->{rbuf} =~ /\012(EndMessage|Data)\012/) { |
| 137 |
# remember end marker |
| 138 |
$rdata = $1 eq "Data" |
| 139 |
or $1 eq "EndMessage" |
| 140 |
or return $self->fatal ("protocol error, expected message end, got $1\n"); |
| 141 |
|
| 142 |
my @lines = split /\012/, substr $hdl->{rbuf}, 0, $-[0]; |
| 143 |
|
| 144 |
substr $hdl->{rbuf}, 0, $+[0], ""; # remove pkg |
| 145 |
|
| 146 |
$type = shift @lines; |
| 147 |
$type = ($TOLC{$type} ||= tolc $type); |
| 148 |
|
| 149 |
my %kv; |
| 150 |
|
| 151 |
for (@lines) { |
| 152 |
($k, $v) = split /=/, $_, 2; |
| 153 |
$k = ($TOLC{$k} ||= tolc $k); |
| 154 |
|
| 155 |
if ($k =~ /\./) { |
| 156 |
# generic, slow case |
| 157 |
my @k = split /\./, $k; |
| 158 |
my $ro = \\%kv; |
| 159 |
|
| 160 |
while (@k) { |
| 161 |
$k = shift @k; |
| 162 |
if ($k =~ /^\d+$/) { |
| 163 |
$ro = \$$ro->[$k]; |
| 164 |
} else { |
| 165 |
$ro = \$$ro->{$k}; |
| 166 |
} |
| 167 |
} |
| 168 |
|
| 169 |
$$ro = $v; |
| 170 |
|
| 171 |
next; |
| 172 |
} |
| 173 |
|
| 174 |
# special comon case, for performance only |
| 175 |
$kv{$k} = $v; |
| 176 |
} |
| 177 |
|
| 178 |
if ($rdata) { |
| 179 |
$_[0]->push_read (chunk => delete $kv{data_length}, sub { |
| 180 |
$rdata = \$_[1]; |
| 181 |
$self->recv ($type, \%kv, $rdata); |
| 182 |
}); |
| 183 |
|
| 184 |
last; # do not tgry to parse more messages |
| 185 |
} else { |
| 186 |
$self->recv ($type, \%kv); |
| 187 |
} |
| 188 |
} |
| 189 |
}; |
| 190 |
|
| 191 |
$self->{hdl} = new AnyEvent::Handle |
| 192 |
connect => [$self->{host} => $self->{port}], |
| 193 |
timeout => $self->{timeout}, |
| 194 |
on_read => $on_read, |
| 195 |
on_eof => $self->{on_eof}, |
| 196 |
on_error => sub { |
| 197 |
$self->fatal ($_[2]); |
| 198 |
}, |
| 199 |
; |
| 200 |
|
| 201 |
Scalar::Util::weaken ($self->{hdl}{fcp} = $self); |
| 202 |
} |
| 203 |
|
| 204 |
$self->send_msg (client_hello => |
| 205 |
name => $self->{name}, |
| 206 |
expected_version => "2.0", |
| 207 |
); |
| 208 |
|
| 209 |
$self |
| 210 |
} |
| 211 |
|
| 212 |
sub fatal { |
| 213 |
my ($self, $msg) = @_; |
| 214 |
|
| 215 |
$self->{hdl}->shutdown; |
| 216 |
delete $self->{kw}; |
| 217 |
|
| 218 |
if ($self->{on_error}) { |
| 219 |
$self->{on_error}->($msg); |
| 220 |
} else { |
| 221 |
die $msg; |
| 222 |
} |
| 223 |
} |
| 224 |
|
| 225 |
sub identifier { |
| 226 |
$_[0]{prefix} . ++$_[0]{idseq} |
| 227 |
} |
| 228 |
|
| 229 |
sub send_msg { |
| 230 |
my ($self, $type, %kv) = @_; |
| 231 |
|
| 232 |
my $data = delete $kv{data}; |
| 233 |
|
| 234 |
if (exists $kv{id_cb}) { |
| 235 |
my $id = $kv{identifier} ||= $self->identifier; |
| 236 |
$self->{id}{$id} = delete $kv{id_cb}; |
| 237 |
} |
| 238 |
|
| 239 |
my $msg = (touc $type) . "\012" |
| 240 |
. join "", map +(touc $_) . "=$kv{$_}\012", keys %kv; |
| 241 |
|
| 242 |
sub id { |
| 243 |
my ($self) = @_; |
| 244 |
|
| 245 |
|
| 246 |
} |
| 247 |
|
| 248 |
if (defined $data) { |
| 249 |
$msg .= "DataLength=" . (length $data) . "\012" |
| 250 |
. "Data\012$data"; |
| 251 |
} else { |
| 252 |
$msg .= "EndMessage\012"; |
| 253 |
} |
| 254 |
|
| 255 |
$self->{hdl}->push_write ($msg); |
| 256 |
} |
| 257 |
|
| 258 |
sub on { |
| 259 |
my ($self, $cb) = @_; |
| 260 |
|
| 261 |
# cb return undef - message eaten, remove cb |
| 262 |
# cb return 0 - message eaten |
| 263 |
# cb return 1 - pass to next |
| 264 |
|
| 265 |
push @{ $self->{on} }, $cb; |
| 266 |
} |
| 267 |
|
| 268 |
sub _push_queue { |
| 269 |
my ($self, $queue) = @_; |
| 270 |
|
| 271 |
shift @$queue; |
| 272 |
$queue->[0]($self, AnyEvent::Util::guard { $self->_push_queue ($queue) }) |
| 273 |
if @$queue; |
| 274 |
} |
| 275 |
|
| 276 |
# lock so only one $type (arbitrary string) is in flight, |
| 277 |
# to work around horribly misdesigned protocol. |
| 278 |
sub serialise { |
| 279 |
my ($self, $type, $cb) = @_; |
| 280 |
|
| 281 |
my $queue = $self->{serialise}{$type} ||= []; |
| 282 |
push @$queue, $cb; |
| 283 |
$cb->($self, AnyEvent::Util::guard { $self->_push_queue ($queue) }) |
| 284 |
unless $#$queue; |
| 285 |
} |
| 286 |
|
| 287 |
# how to merge these types into $self->{persistent} |
| 288 |
our %PERSISTENT_TYPE = ( |
| 289 |
persistent_get => sub { %{ $_[1] } = (type => "persistent_get" , %{ $_[2] }) }, |
| 290 |
persistent_put => sub { %{ $_[1] } = (type => "persistent_put" , %{ $_[2] }) }, |
| 291 |
persistent_put_dir => sub { %{ $_[1] } = (type => "persistent_put_dir", %{ $_[2] }) }, |
| 292 |
persistent_request_modified => sub { %{ $_[1] } = (%{ $_[1] }, %{ $_[2] }) }, |
| 293 |
persistent_request_removed => sub { delete $_[0]{req}{$_[2]{identifier}} }, |
| 294 |
|
| 295 |
simple_progress => sub { $_[1]{simple_progress} = $_[2] }, # get/put |
| 296 |
|
| 297 |
uri_generated => sub { $_[1]{uri_generated} = $_[2] }, # put |
| 298 |
generated_metadata => sub { $_[1]{generated_metadata} = $_[2] }, # put |
| 299 |
started_compression => sub { $_[1]{started_compression} = $_[2] }, # put |
| 300 |
finished_compression => sub { $_[1]{finished_compression} = $_[2] }, # put |
| 301 |
put_fetchable => sub { $_[1]{put_fetchable} = $_[2] }, # put |
| 302 |
put_failed => sub { $_[1]{put_failed} = $_[2] }, # put |
| 303 |
put_successful => sub { $_[1]{put_successful} = $_[2] }, # put |
| 304 |
|
| 305 |
sending_to_network => sub { $_[1]{sending_to_network} = $_[2] }, # get |
| 306 |
compatibility_mode => sub { $_[1]{compatibility_mode} = $_[2] }, # get |
| 307 |
expected_hashes => sub { $_[1]{expected_hashes} = $_[2] }, # get |
| 308 |
expected_mime => sub { $_[1]{expected_mime} = $_[2] }, # get |
| 309 |
expected_data_length => sub { $_[1]{expected_data_length} = $_[2] }, # get |
| 310 |
get_failed => sub { $_[1]{get_failed} = $_[2] }, # get |
| 311 |
data_found => sub { $_[1]{data_found} = $_[2] }, # get |
| 312 |
enter_finite_cooldown => sub { $_[1]{enter_finite_cooldown} = $_[2] }, # get |
| 313 |
); |
| 314 |
|
| 315 |
sub recv { |
| 316 |
my ($self, $type, $kv, @extra) = @_; |
| 317 |
|
| 318 |
if (my $cb = $PERSISTENT_TYPE{$type}) { |
| 319 |
my $id = $kv->{identifier}; |
| 320 |
my $req = $_[0]{req}{$id} ||= {}; |
| 321 |
$cb->($self, $req, $kv); |
| 322 |
$self->recv (request_changed => $kv, $type, @extra); |
| 323 |
} |
| 324 |
|
| 325 |
my $on = $self->{on}; |
| 326 |
for (0 .. $#$on) { |
| 327 |
unless (my $res = $on->[$_]($self, $type, $kv, @extra)) { |
| 328 |
splice @$on, $_, 1 unless defined $res; |
| 329 |
return; |
| 330 |
} |
| 331 |
} |
| 332 |
|
| 333 |
if (my $cb = $self->{queue}[0]) { |
| 334 |
$cb->($self, $type, $kv, @extra) |
| 335 |
and shift @{ $self->{queue} }; |
| 336 |
} else { |
| 337 |
$self->default_recv ($type, $kv, @extra); |
| 338 |
} |
| 339 |
} |
| 340 |
|
| 341 |
sub default_recv { |
| 342 |
my ($self, $type, $kv, $rdata) = @_; |
| 343 |
|
| 344 |
if ($type eq "node_hello") { |
| 345 |
$self->{node_hello} = $kv; |
| 346 |
} elsif (exists $self->{id}{$kv->{identifier}}) { |
| 347 |
$self->{id}{$kv->{identifier}}($self, $type, $kv, $rdata) |
| 348 |
and delete $self->{id}{$kv->{identifier}}; |
| 349 |
} |
| 350 |
} |
| 351 |
|
| 352 |
=back |
| 353 |
|
| 354 |
=head2 FCP REQUESTS |
| 355 |
|
| 356 |
The following methods implement various requests. Most of them map |
| 357 |
directory to the FCP message of the same name. The added benefit of |
| 358 |
these over sending requests yourself is that they handle the necessary |
| 359 |
serialisation, protocol quirks, and replies. |
| 360 |
|
| 361 |
All of them exist in two versions, the variant shown in this manpage, and |
| 362 |
a variant with an extra C<_> at the end, and an extra C<$cb> argument. The |
| 363 |
version as shown is I<synchronous> - it will wait for any replies, and |
| 364 |
either return the reply, or croak with an error. The underscore variant |
| 365 |
returns immediately and invokes one or more callbacks or condvars later. |
| 366 |
|
| 367 |
For example, the call |
| 368 |
|
| 369 |
$info = $fcp->get_plugin_info ($name, $detailed); |
| 370 |
|
| 371 |
Also comes in this underscore variant: |
| 372 |
|
| 373 |
$fcp->get_plugin_info_ ($name, $detailed, $cb); |
| 374 |
|
| 375 |
You can thinbk of the underscore as a kind of continuation indicator - the |
| 376 |
normal function waits and returns with the data, the C<_> indicates that |
| 377 |
you pass the continuation yourself, and the continuation will be invoked |
| 378 |
with the results. |
| 379 |
|
| 380 |
This callback/continuation argument (C<$cb>) can come in three forms itself: |
| 381 |
|
| 382 |
=over 4 |
| 383 |
|
| 384 |
=item A code reference (or rather anything not matching some other alternative) |
| 385 |
|
| 386 |
This code reference will be invoked with the result on success. On an |
| 387 |
error, it will die (in the event loop) with a backtrace of the call site. |
| 388 |
|
| 389 |
This is a popular choice, but it makes handling errors hard - make sure |
| 390 |
you never generate protocol errors! |
| 391 |
|
| 392 |
=item A condvar (as returned by e.g. C<< AnyEvent->condvar >>) |
| 393 |
|
| 394 |
When a condvar is passed, it is sent (C<< $cv->send ($results) >>) the |
| 395 |
results when the request has finished. Should an error occur, the error |
| 396 |
will instead result in C<< $cv->croak ($error) >>. |
| 397 |
|
| 398 |
This is also a popular choice. |
| 399 |
|
| 400 |
=item An array with two callbacks C<[$success, $failure]> |
| 401 |
|
| 402 |
The C<$success> callback will be invoked with the results, while the |
| 403 |
C<$failure> callback will be invoked on any errors. |
| 404 |
|
| 405 |
=item C<undef> |
| 406 |
|
| 407 |
This is the same thing as specifying C<sub { }> as callback, i.e. on |
| 408 |
success, the results are ignored, while on failure, you the module dies |
| 409 |
with a backtrace. |
| 410 |
|
| 411 |
This is good for quick scripts, or when you really aren't interested in |
| 412 |
the results. |
| 413 |
|
| 414 |
=back |
| 415 |
|
| 416 |
=cut |
| 417 |
|
| 418 |
our $NOP_CB = sub { }; |
| 419 |
|
| 420 |
sub _txn { |
| 421 |
my ($name, $sub) = @_; |
| 422 |
|
| 423 |
*{$name} = sub { |
| 424 |
my $cv = AE::cv; |
| 425 |
|
| 426 |
splice @_, 1, 0, $cv, sub { $cv->croak ($_[0]{extra_description}) }; |
| 427 |
&$sub; |
| 428 |
$cv->recv |
| 429 |
}; |
| 430 |
|
| 431 |
*{"$name\_"} = sub { |
| 432 |
my ($ok, $err) = pop; |
| 433 |
|
| 434 |
if (ARRAY:: eq ref $ok) { |
| 435 |
($ok, $err) = @$ok; |
| 436 |
} elsif (UNIVERSAL::isa $ok, AnyEvent::CondVar::) { |
| 437 |
$err = sub { $ok->croak ($_[0]{extra_description}) }; |
| 438 |
} else { |
| 439 |
my $bt = Carp::longmess ""; |
| 440 |
$err = sub { |
| 441 |
die "$_[0]{code_description} ($_[0]{extra_description})$bt"; |
| 442 |
}; |
| 443 |
} |
| 444 |
|
| 445 |
$ok ||= $NOP_CB; |
| 446 |
|
| 447 |
splice @_, 1, 0, $ok, $err; |
| 448 |
&$sub; |
| 449 |
}; |
| 450 |
} |
| 451 |
|
| 452 |
=over 4 |
| 453 |
|
| 454 |
=item $peers = $fcp->list_peers ([$with_metdata[, $with_volatile]]) |
| 455 |
|
| 456 |
=cut |
| 457 |
|
| 458 |
_txn list_peers => sub { |
| 459 |
my ($self, $ok, undef, $with_metadata, $with_volatile) = @_; |
| 460 |
|
| 461 |
my @res; |
| 462 |
|
| 463 |
$self->send_msg (list_peers => |
| 464 |
with_metadata => $with_metadata ? "true" : "false", |
| 465 |
with_volatile => $with_volatile ? "true" : "false", |
| 466 |
id_cb => sub { |
| 467 |
my ($self, $type, $kv, $rdata) = @_; |
| 468 |
|
| 469 |
if ($type eq "end_list_peers") { |
| 470 |
$ok->(\@res); |
| 471 |
1 |
| 472 |
} else { |
| 473 |
push @res, $kv; |
| 474 |
0 |
| 475 |
} |
| 476 |
}, |
| 477 |
); |
| 478 |
}; |
| 479 |
|
| 480 |
=item $notes = $fcp->list_peer_notes ($node_identifier) |
| 481 |
|
| 482 |
=cut |
| 483 |
|
| 484 |
_txn list_peer_notes => sub { |
| 485 |
my ($self, $ok, undef, $node_identifier) = @_; |
| 486 |
|
| 487 |
$self->send_msg (list_peer_notes => |
| 488 |
node_identifier => $node_identifier, |
| 489 |
id_cb => sub { |
| 490 |
my ($self, $type, $kv, $rdata) = @_; |
| 491 |
|
| 492 |
$ok->($kv); |
| 493 |
1 |
| 494 |
}, |
| 495 |
); |
| 496 |
}; |
| 497 |
|
| 498 |
=item $fcp->watch_global ($enabled[, $verbosity_mask]) |
| 499 |
|
| 500 |
=cut |
| 501 |
|
| 502 |
_txn watch_global => sub { |
| 503 |
my ($self, $ok, $err, $enabled, $verbosity_mask) = @_; |
| 504 |
|
| 505 |
$self->send_msg (watch_global => |
| 506 |
enabled => $enabled ? "true" : "false", |
| 507 |
defined $verbosity_mask ? (verbosity_mask => $verbosity_mask+0) : (), |
| 508 |
); |
| 509 |
|
| 510 |
$ok->(); |
| 511 |
}; |
| 512 |
|
| 513 |
=item $reqs = $fcp->list_persistent_requests |
| 514 |
|
| 515 |
=cut |
| 516 |
|
| 517 |
_txn list_persistent_requests => sub { |
| 518 |
my ($self, $ok, $err) = @_; |
| 519 |
|
| 520 |
$self->serialise (list_persistent_requests => sub { |
| 521 |
my ($self, $guard) = @_; |
| 522 |
|
| 523 |
my @res; |
| 524 |
|
| 525 |
$self->send_msg ("list_persistent_requests"); |
| 526 |
|
| 527 |
$self->on (sub { |
| 528 |
my ($self, $type, $kv, $rdata) = @_; |
| 529 |
|
| 530 |
$guard if 0; |
| 531 |
|
| 532 |
if ($type eq "end_list_persistent_requests") { |
| 533 |
$ok->(\@res); |
| 534 |
return; |
| 535 |
} else { |
| 536 |
my $id = $kv->{identifier}; |
| 537 |
|
| 538 |
if ($type =~ /^persistent_(get|put|put_dir)$/) { |
| 539 |
push @res, [$type, $kv]; |
| 540 |
} |
| 541 |
} |
| 542 |
|
| 543 |
1 |
| 544 |
}); |
| 545 |
}); |
| 546 |
}; |
| 547 |
|
| 548 |
=item $sync = $fcp->modify_persistent_request ($global, $identifier[, $client_token[, $priority_class]]) |
| 549 |
|
| 550 |
Update either the C<client_token> or C<priority_class> of a request |
| 551 |
identified by C<$global> and C<$identifier>, depending on which of |
| 552 |
C<$client_token> and C<$priority_class> are not C<undef>. |
| 553 |
|
| 554 |
=cut |
| 555 |
|
| 556 |
_txn modify_persistent_request => sub { |
| 557 |
my ($self, $ok, $err, $global, $identifier, $client_token, $priority_class) = @_; |
| 558 |
|
| 559 |
$self->serialise ($identifier => sub { |
| 560 |
my ($self, $guard) = @_; |
| 561 |
|
| 562 |
$self->send_msg (modify_persistent_request => |
| 563 |
global => $global ? "true" : "false", |
| 564 |
identifier => $identifier, |
| 565 |
defined $client_token ? (client_token => $client_token ) : (), |
| 566 |
defined $priority_class ? (priority_class => $priority_class) : (), |
| 567 |
); |
| 568 |
|
| 569 |
$self->on (sub { |
| 570 |
my ($self, $type, $kv, @extra) = @_; |
| 571 |
|
| 572 |
$guard if 0; |
| 573 |
|
| 574 |
if ($kv->{identifier} eq $identifier) { |
| 575 |
if ($type eq "persistent_request_modified") { |
| 576 |
$ok->($kv); |
| 577 |
return; |
| 578 |
} elsif ($type eq "protocol_error") { |
| 579 |
$err->($kv); |
| 580 |
return; |
| 581 |
} |
| 582 |
} |
| 583 |
|
| 584 |
1 |
| 585 |
}); |
| 586 |
}); |
| 587 |
}; |
| 588 |
|
| 589 |
=item $info = $fcp->get_plugin_info ($name, $detailed) |
| 590 |
|
| 591 |
=cut |
| 592 |
|
| 593 |
_txn get_plugin_info => sub { |
| 594 |
my ($self, $ok, $err, $name, $detailed) = @_; |
| 595 |
|
| 596 |
my $id = $self->identifier; |
| 597 |
|
| 598 |
$self->send_msg (get_plugin_info => |
| 599 |
identifier => $id, |
| 600 |
plugin_name => $name, |
| 601 |
detailed => $detailed ? "true" : "false", |
| 602 |
); |
| 603 |
$self->on (sub { |
| 604 |
my ($self, $type, $kv) = @_; |
| 605 |
|
| 606 |
if ($kv->{identifier} eq $id) { |
| 607 |
if ($type eq "get_plugin_info") { |
| 608 |
$ok->($kv); |
| 609 |
} else { |
| 610 |
$err->($kv, $type); |
| 611 |
} |
| 612 |
return; |
| 613 |
} |
| 614 |
|
| 615 |
1 |
| 616 |
}); |
| 617 |
}; |
| 618 |
|
| 619 |
=item $status = $fcp->client_get ($uri, $identifier, %kv) |
| 620 |
|
| 621 |
%kv can contain (L<http://wiki.freenetproject.org/FCP2p0ClientGet>). |
| 622 |
|
| 623 |
ignore_ds, ds_only, verbosity, max_size, max_temp_size, max_retries, |
| 624 |
priority_class, persistence, client_token, global, return_type, |
| 625 |
binary_blob, allowed_mime_types, filename, temp_filename |
| 626 |
|
| 627 |
=cut |
| 628 |
|
| 629 |
_txn client_get => sub { |
| 630 |
my ($self, $ok, $err, $uri, $identifier, %kv) = @_; |
| 631 |
|
| 632 |
$self->serialise ($identifier => sub { |
| 633 |
my ($self, $guard) = @_; |
| 634 |
|
| 635 |
$self->send_msg (client_get => |
| 636 |
%kv, |
| 637 |
uri => $uri, |
| 638 |
identifier => $identifier, |
| 639 |
); |
| 640 |
|
| 641 |
$self->on (sub { |
| 642 |
my ($self, $type, $kv, @extra) = @_; |
| 643 |
|
| 644 |
$guard if 0; |
| 645 |
|
| 646 |
if ($kv->{identifier} eq $identifier) { |
| 647 |
if ($type eq "persistent_get") { |
| 648 |
$ok->($kv); |
| 649 |
return; |
| 650 |
} elsif ($type eq "protocol_error") { |
| 651 |
$err->($kv); |
| 652 |
return; |
| 653 |
} |
| 654 |
} |
| 655 |
|
| 656 |
1 |
| 657 |
}); |
| 658 |
}); |
| 659 |
}; |
| 660 |
|
| 661 |
=item $status = $fcp->remove_request ($identifier[, $global]) |
| 662 |
|
| 663 |
Remove the request with the given isdentifier. Returns true if successful, |
| 664 |
false on error. |
| 665 |
|
| 666 |
=cut |
| 667 |
|
| 668 |
_txn remove_request => sub { |
| 669 |
my ($self, $ok, $err, $identifier, $global) = @_; |
| 670 |
|
| 671 |
$self->serialise ($identifier => sub { |
| 672 |
my ($self, $guard) = @_; |
| 673 |
|
| 674 |
$self->send_msg (remove_request => |
| 675 |
identifier => $identifier, |
| 676 |
global => $global ? "true" : "false", |
| 677 |
); |
| 678 |
$self->on (sub { |
| 679 |
my ($self, $type, $kv, @extra) = @_; |
| 680 |
|
| 681 |
$guard if 0; |
| 682 |
|
| 683 |
if ($kv->{identifier} eq $identifier) { |
| 684 |
if ($type eq "persistent_request_removed") { |
| 685 |
$ok->(1); |
| 686 |
return; |
| 687 |
} elsif ($type eq "protocol_error") { |
| 688 |
$err->($kv); |
| 689 |
return; |
| 690 |
} |
| 691 |
} |
| 692 |
|
| 693 |
1 |
| 694 |
}); |
| 695 |
}); |
| 696 |
}; |
| 697 |
|
| 698 |
=item ($can_read, $can_write) = $fcp->test_dda ($local_directory, $remote_directory, $want_read, $want_write)) |
| 699 |
|
| 700 |
The DDA test in FCP is probably the single most broken protocol - only |
| 701 |
one directory test can be outstanding at any time, and some guessing and |
| 702 |
heuristics are involved in mangling the paths. |
| 703 |
|
| 704 |
This function combines C<TestDDARequest> and C<TestDDAResponse> in one |
| 705 |
request, handling file reading and writing as well, and tries very hard to |
| 706 |
do the right thing. |
| 707 |
|
| 708 |
Both C<$local_directory> and C<$remote_directory> must specify the same |
| 709 |
directory - C<$local_directory> is the directory path on the client (where |
| 710 |
L<AnyEvent::FCP> runs) and C<$remote_directory> is the directory path on |
| 711 |
the server (where the freenet node runs). When both are running on the |
| 712 |
same node, the paths are generally identical. |
| 713 |
|
| 714 |
C<$want_read> and C<$want_write> should be set to a true value when you |
| 715 |
want to read (get) files or write (put) files, respectively. |
| 716 |
|
| 717 |
On error, an exception is thrown. Otherwise, C<$can_read> and |
| 718 |
C<$can_write> indicate whether you can reaqd or write to freenet via the |
| 719 |
directory. |
| 720 |
|
| 721 |
=cut |
| 722 |
|
| 723 |
_txn test_dda => sub { |
| 724 |
my ($self, $ok, $err, $local, $remote, $want_read, $want_write) = @_; |
| 725 |
|
| 726 |
$self->serialise (test_dda => sub { |
| 727 |
my ($self, $guard) = @_; |
| 728 |
|
| 729 |
$self->send_msg (test_dda_request => |
| 730 |
directory => $remote, |
| 731 |
want_read_directory => $want_read ? "true" : "false", |
| 732 |
want_write_directory => $want_write ? "true" : "false", |
| 733 |
); |
| 734 |
$self->on (sub { |
| 735 |
my ($self, $type, $kv) = @_; |
| 736 |
|
| 737 |
if ($type eq "test_dda_reply") { |
| 738 |
# the filenames are all relative to the server-side directory, |
| 739 |
# which might or might not match $remote anymore, so we |
| 740 |
# need to rewrite the paths to be relative to $local |
| 741 |
for my $k (qw(read_filename write_filename)) { |
| 742 |
my $f = $kv->{$k}; |
| 743 |
for my $dir ($kv->{directory}, $remote) { |
| 744 |
if ($dir eq substr $f, 0, length $dir) { |
| 745 |
substr $f, 0, 1 + length $dir, ""; |
| 746 |
$kv->{$k} = $f; |
| 747 |
last; |
| 748 |
} |
| 749 |
} |
| 750 |
} |
| 751 |
|
| 752 |
my %response = (directory => $remote); |
| 753 |
|
| 754 |
if (length $kv->{read_filename}) { |
| 755 |
if (open my $fh, "<:raw", "$local/$kv->{read_filename}") { |
| 756 |
sysread $fh, my $buf, -s $fh; |
| 757 |
$response{read_content} = $buf; |
| 758 |
} |
| 759 |
} |
| 760 |
|
| 761 |
if (length $kv->{write_filename}) { |
| 762 |
if (open my $fh, ">:raw", "$local/$kv->{write_filename}") { |
| 763 |
syswrite $fh, $kv->{content_to_write}; |
| 764 |
} |
| 765 |
} |
| 766 |
|
| 767 |
$self->send_msg (test_dda_response => %response); |
| 768 |
|
| 769 |
$self->on (sub { |
| 770 |
my ($self, $type, $kv) = @_; |
| 771 |
|
| 772 |
$guard if 0; # reference |
| 773 |
|
| 774 |
if ($type eq "test_dda_complete") { |
| 775 |
$ok->( |
| 776 |
$kv->{read_directory_allowed} eq "true", |
| 777 |
$kv->{write_directory_allowed} eq "true", |
| 778 |
); |
| 779 |
} elsif ($type eq "protocol_error" && $kv->{identifier} eq $remote) { |
| 780 |
$err->($kv->{extra_description}); |
| 781 |
return; |
| 782 |
} |
| 783 |
|
| 784 |
1 |
| 785 |
}); |
| 786 |
|
| 787 |
return; |
| 788 |
} elsif ($type eq "protocol_error" && $kv->{identifier} eq $remote) { |
| 789 |
$err->($kv); |
| 790 |
return; |
| 791 |
} |
| 792 |
|
| 793 |
1 |
| 794 |
}); |
| 795 |
}); |
| 796 |
}; |
| 797 |
|
| 798 |
=back |
| 799 |
|
| 800 |
=head2 REQUEST CACHE |
| 801 |
|
| 802 |
The C<AnyEvent::FCP> class keeps a request cache, where it caches all |
| 803 |
information from requests. |
| 804 |
|
| 805 |
For these messages, it will store a copy of the key-value pairs, together with a C<type> slot, |
| 806 |
in C<< $fcp->{req}{$identifier} >>: |
| 807 |
|
| 808 |
persistent_get |
| 809 |
persistent_put |
| 810 |
persistent_put_dir |
| 811 |
|
| 812 |
This message updates the stored data: |
| 813 |
|
| 814 |
persistent_request_modified |
| 815 |
|
| 816 |
This message will remove this entry: |
| 817 |
|
| 818 |
persistent_request_removed |
| 819 |
|
| 820 |
These messages get merged into the cache entry, under their |
| 821 |
type, i.e. a C<simple_progress> message will be stored in C<< |
| 822 |
$fcp->{req}{$identifier}{simple_progress} >>: |
| 823 |
|
| 824 |
simple_progress # get/put |
| 825 |
|
| 826 |
uri_generated # put |
| 827 |
generated_metadata # put |
| 828 |
started_compression # put |
| 829 |
finished_compression # put |
| 830 |
put_failed # put |
| 831 |
put_fetchable # put |
| 832 |
put_successful # put |
| 833 |
|
| 834 |
sending_to_network # get |
| 835 |
compatibility_mode # get |
| 836 |
expected_hashes # get |
| 837 |
expected_mime # get |
| 838 |
expected_data_length # get |
| 839 |
get_failed # get |
| 840 |
data_found # get |
| 841 |
enter_finite_cooldown # get |
| 842 |
|
| 843 |
In addition, an event (basically a fake message) of type C<request_changed> is generated |
| 844 |
on every change, which will be called as C<< $cb->($fcp, $kv, $type) >>, where C<$type> |
| 845 |
is the type of the original message triggering the change, |
| 846 |
|
| 847 |
To fill this cache with the global queue and keep it updated, |
| 848 |
call C<watch_global> to subscribe to updates, followed by |
| 849 |
C<list_persistent_requests_sync>. |
| 850 |
|
| 851 |
$fcp->watch_global_sync_; # do not wait |
| 852 |
$fcp->list_persistent_requests; # wait |
| 853 |
|
| 854 |
To get a better idea of what is stored in the cache, here is an example of |
| 855 |
what might be stored in C<< $fcp->{req}{"Frost-gpl.txt"} >>: |
| 856 |
|
| 857 |
{ |
| 858 |
identifier => "Frost-gpl.txt", |
| 859 |
uri => 'CHK@Fnx5kzdrfE,EImdzaVyEWl,AAIC--8/gpl.txt', |
| 860 |
binary_blob => "false", |
| 861 |
global => "true", |
| 862 |
max_retries => -1, |
| 863 |
max_size => 9223372036854775807, |
| 864 |
persistence => "forever", |
| 865 |
priority_class => 3, |
| 866 |
real_time => "false", |
| 867 |
return_type => "direct", |
| 868 |
started => "true", |
| 869 |
type => "persistent_get", |
| 870 |
verbosity => 2147483647, |
| 871 |
sending_to_network => { |
| 872 |
identifier => "Frost-gpl.txt", |
| 873 |
global => "true", |
| 874 |
}, |
| 875 |
compatibility_mode => { |
| 876 |
identifier => "Frost-gpl.txt", |
| 877 |
definitive => "true", |
| 878 |
dont_compress => "false", |
| 879 |
global => "true", |
| 880 |
max => "COMPAT_1255", |
| 881 |
min => "COMPAT_1255", |
| 882 |
}, |
| 883 |
expected_hashes => { |
| 884 |
identifier => "Frost-gpl.txt", |
| 885 |
global => "true", |
| 886 |
hashes => { |
| 887 |
ed2k => "d83596f5ee3b7...", |
| 888 |
md5 => "e0894e4a2a6...", |
| 889 |
sha1 => "...", |
| 890 |
sha256 => "...", |
| 891 |
sha512 => "...", |
| 892 |
tth => "...", |
| 893 |
}, |
| 894 |
}, |
| 895 |
expected_mime => { |
| 896 |
identifier => "Frost-gpl.txt", |
| 897 |
global => "true", |
| 898 |
metadata => { content_type => "application/rar" }, |
| 899 |
}, |
| 900 |
expected_data_length => { |
| 901 |
identifier => "Frost-gpl.txt", |
| 902 |
data_length => 37576, |
| 903 |
global => "true", |
| 904 |
}, |
| 905 |
simple_progress => { |
| 906 |
identifier => "Frost-gpl.txt", |
| 907 |
failed => 0, |
| 908 |
fatally_failed => 0, |
| 909 |
finalized_total => "true", |
| 910 |
global => "true", |
| 911 |
last_progress => 1438639282628, |
| 912 |
required => 372, |
| 913 |
succeeded => 102, |
| 914 |
total => 747, |
| 915 |
}, |
| 916 |
data_found => { |
| 917 |
identifier => "Frost-gpl.txt", |
| 918 |
completion_time => 1438663354026, |
| 919 |
data_length => 37576, |
| 920 |
global => "true", |
| 921 |
metadata => { content_type => "image/jpeg" }, |
| 922 |
startup_time => 1438657196167, |
| 923 |
}, |
| 924 |
} |
| 925 |
|
| 926 |
=head1 EXAMPLE PROGRAM |
| 927 |
|
| 928 |
use AnyEvent::FCP; |
| 929 |
|
| 930 |
my $fcp = new AnyEvent::FCP; |
| 931 |
|
| 932 |
# let us look at the global request list |
| 933 |
$fcp->watch_global_ (1); |
| 934 |
|
| 935 |
# list them, synchronously |
| 936 |
my $req = $fcp->list_persistent_requests; |
| 937 |
|
| 938 |
# go through all requests |
| 939 |
TODO |
| 940 |
for my $req (values %$req) { |
| 941 |
# skip jobs not directly-to-disk |
| 942 |
next unless $req->{return_type} eq "disk"; |
| 943 |
# skip jobs not issued by FProxy |
| 944 |
next unless $req->{identifier} =~ /^FProxy:/; |
| 945 |
|
| 946 |
if ($req->{data_found}) { |
| 947 |
# file has been successfully downloaded |
| 948 |
|
| 949 |
... move the file away |
| 950 |
(left as exercise) |
| 951 |
|
| 952 |
# remove the request |
| 953 |
|
| 954 |
$fcp->remove_request (1, $req->{identifier}); |
| 955 |
} elsif ($req->{get_failed}) { |
| 956 |
# request has failed |
| 957 |
if ($req->{get_failed}{code} == 11) { |
| 958 |
# too many path components, should restart |
| 959 |
} else { |
| 960 |
# other failure |
| 961 |
} |
| 962 |
} else { |
| 963 |
# modify priorities randomly, to improve download rates |
| 964 |
$fcp->modify_persistent_request (1, $req->{identifier}, undef, int 6 - 5 * (rand) ** 1.7) |
| 965 |
if 0.1 > rand; |
| 966 |
} |
| 967 |
} |
| 968 |
|
| 969 |
# see if the dummy plugin is loaded, to ensure all previous requests have finished. |
| 970 |
$fcp->get_plugin_info_sync ("dummy"); |
| 971 |
|
| 972 |
=head1 SEE ALSO |
| 973 |
|
| 974 |
L<http://wiki.freenetproject.org/FreenetFCPSpec2Point0>, L<Net::FCP>. |
| 975 |
|
| 976 |
=head1 BUGS |
| 977 |
|
| 978 |
=head1 AUTHOR |
| 979 |
|
| 980 |
Marc Lehmann <schmorp@schmorp.de> |
| 981 |
http://home.schmorp.de/ |
| 982 |
|
| 983 |
=cut |
| 984 |
|
| 985 |
1 |
| 986 |
|
