| 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 |
my $ni = $fcp->txn_node_info->result; |
| 12 |
my $ni = $fcp->node_info; |
| 13 |
|
| 14 |
=head1 DESCRIPTION |
| 15 |
|
| 16 |
This module implements the freenet client protocol version 2.0, as used by |
| 17 |
freenet 0.7. See L<Net::FCP> for the earlier freenet 0.5 version. |
| 18 |
|
| 19 |
See L<http://wiki.freenetproject.org/FreenetFCPSpec2Point0> for a description |
| 20 |
of what the messages do. |
| 21 |
|
| 22 |
The module uses L<AnyEvent> to find a suitable event module. |
| 23 |
|
| 24 |
=head2 IMPORT TAGS |
| 25 |
|
| 26 |
Nothing much can be "imported" from this module right now. |
| 27 |
|
| 28 |
=head2 FREENET BASICS |
| 29 |
|
| 30 |
Ok, this section will not explain any freenet basics to you, just some |
| 31 |
problems I found that you might want to avoid: |
| 32 |
|
| 33 |
=over 4 |
| 34 |
|
| 35 |
=item freenet URIs are _NOT_ URIs |
| 36 |
|
| 37 |
Whenever a "uri" is required by the protocol, freenet expects a kind of |
| 38 |
URI prefixed with the "freenet:" scheme, e.g. "freenet:CHK...". However, |
| 39 |
these are not URIs, as freeent fails to parse them correctly, that is, you |
| 40 |
must unescape an escaped characters ("%2c" => ",") yourself. Maybe in the |
| 41 |
future this library will do it for you, so watch out for this incompatible |
| 42 |
change. |
| 43 |
|
| 44 |
=back |
| 45 |
|
| 46 |
=head2 THE AnyEvent::FCP CLASS |
| 47 |
|
| 48 |
=over 4 |
| 49 |
|
| 50 |
=cut |
| 51 |
|
| 52 |
package AnyEvent::FCP; |
| 53 |
|
| 54 |
use Carp; |
| 55 |
|
| 56 |
$VERSION = '0.1'; |
| 57 |
|
| 58 |
no warnings; |
| 59 |
|
| 60 |
use AnyEvent; |
| 61 |
use AnyEvent::Socket; |
| 62 |
|
| 63 |
sub touc($) { |
| 64 |
local $_ = shift; |
| 65 |
1 while s/((?:^|_)(?:svk|chk|uri)(?:_|$))/\U$1/; |
| 66 |
s/(?:^|_)(.)/\U$1/g; |
| 67 |
$_ |
| 68 |
} |
| 69 |
|
| 70 |
sub tolc($) { |
| 71 |
local $_ = shift; |
| 72 |
1 while s/(SVK|CHK|URI)([^_])/$1\_$2/i; |
| 73 |
1 while s/([^_])(SVK|CHK|URI)/$1\_$2/i; |
| 74 |
s/(?<=[a-z])(?=[A-Z])/_/g; |
| 75 |
lc |
| 76 |
} |
| 77 |
|
| 78 |
=item $fcp = new AnyEvent::FCP [host => $host][, port => $port][, progress => \&cb][, name => $name] |
| 79 |
|
| 80 |
Create a new FCP connection to the given host and port (default |
| 81 |
127.0.0.1:8481, or the environment variables C<FREDHOST> and C<FREDPORT>). |
| 82 |
|
| 83 |
If no C<name> was specified, then AnyEvent::FCP will generate a (hopefully) |
| 84 |
unique client name for you. |
| 85 |
|
| 86 |
#TODO |
| 87 |
#You can install a progress callback that is being called with the Net::FCP |
| 88 |
#object, a txn object, the type of the transaction and the attributes. Use |
| 89 |
#it like this: |
| 90 |
# |
| 91 |
# sub progress_cb { |
| 92 |
# my ($self, $txn, $type, $attr) = @_; |
| 93 |
# |
| 94 |
# warn "progress<$txn,$type," . (join ":", %$attr) . ">\n"; |
| 95 |
# } |
| 96 |
|
| 97 |
=cut |
| 98 |
|
| 99 |
sub new { |
| 100 |
my $class = shift; |
| 101 |
my $self = bless { @_ }, $class; |
| 102 |
|
| 103 |
$self->{host} ||= $ENV{FREDHOST} || "127.0.0.1"; |
| 104 |
$self->{port} ||= $ENV{FREDPORT} || 9481; |
| 105 |
$self->{name} ||= time.rand.rand.rand; # lame |
| 106 |
|
| 107 |
$self->{conn} = new AnyEvent::Socket |
| 108 |
PeerAddr => "$self->{host}:$self->{port}", |
| 109 |
on_eof => $self->{on_eof} || sub { }, |
| 110 |
|
| 111 |
$self |
| 112 |
} |
| 113 |
|
| 114 |
sub progress { |
| 115 |
my ($self, $txn, $type, $attr) = @_; |
| 116 |
|
| 117 |
$self->{progress}->($self, $txn, $type, $attr) |
| 118 |
if $self->{progress}; |
| 119 |
} |
| 120 |
|
| 121 |
=item $txn = $fcp->txn (type => attr => val,...) |
| 122 |
|
| 123 |
The low-level interface to transactions. Don't use it unless you have |
| 124 |
"special needs". Instead, use predefiend transactions like this: |
| 125 |
|
| 126 |
The blocking case, no (visible) transactions involved: |
| 127 |
|
| 128 |
my $nodehello = $fcp->client_hello; |
| 129 |
|
| 130 |
A transaction used in a blocking fashion: |
| 131 |
|
| 132 |
my $txn = $fcp->txn_client_hello; |
| 133 |
... |
| 134 |
my $nodehello = $txn->result; |
| 135 |
|
| 136 |
Or shorter: |
| 137 |
|
| 138 |
my $nodehello = $fcp->txn_client_hello->result; |
| 139 |
|
| 140 |
Setting callbacks: |
| 141 |
|
| 142 |
$fcp->txn_client_hello->cb( |
| 143 |
sub { my $nodehello => $_[0]->result } |
| 144 |
); |
| 145 |
|
| 146 |
=cut |
| 147 |
|
| 148 |
sub txn { |
| 149 |
my ($self, $type, %attr) = @_; |
| 150 |
|
| 151 |
$type = touc $type; |
| 152 |
|
| 153 |
my $txn = "Net::FCP::Txn::$type"->new (fcp => $self, type => tolc $type, attr => \%attr); |
| 154 |
|
| 155 |
$txn; |
| 156 |
} |
| 157 |
|
| 158 |
{ # transactions |
| 159 |
|
| 160 |
my $txn = sub { |
| 161 |
my ($name, $sub) = @_; |
| 162 |
*{"txn_$name"} = $sub; |
| 163 |
*{$name} = sub { $sub->(@_)->result }; |
| 164 |
}; |
| 165 |
|
| 166 |
=item $txn = $fcp->txn_client_hello |
| 167 |
|
| 168 |
=item $nodehello = $fcp->client_hello |
| 169 |
|
| 170 |
Executes a ClientHello request and returns it's results. |
| 171 |
|
| 172 |
{ |
| 173 |
max_file_size => "5f5e100", |
| 174 |
node => "Fred,0.6,1.46,7050" |
| 175 |
protocol => "1.2", |
| 176 |
} |
| 177 |
|
| 178 |
=cut |
| 179 |
|
| 180 |
$txn->(client_hello => sub { |
| 181 |
my ($self) = @_; |
| 182 |
|
| 183 |
$self->txn ("client_hello"); |
| 184 |
}); |
| 185 |
|
| 186 |
=item $txn = $fcp->txn_client_info |
| 187 |
|
| 188 |
=item $nodeinfo = $fcp->client_info |
| 189 |
|
| 190 |
Executes a ClientInfo request and returns it's results. |
| 191 |
|
| 192 |
{ |
| 193 |
active_jobs => "1f", |
| 194 |
allocated_memory => "bde0000", |
| 195 |
architecture => "i386", |
| 196 |
available_threads => 17, |
| 197 |
datastore_free => "5ce03400", |
| 198 |
datastore_max => "2540be400", |
| 199 |
datastore_used => "1f72bb000", |
| 200 |
estimated_load => 52, |
| 201 |
free_memory => "5cc0148", |
| 202 |
is_transient => "false", |
| 203 |
java_name => "Java HotSpot(_T_M) Server VM", |
| 204 |
java_vendor => "http://www.blackdown.org/", |
| 205 |
java_version => "Blackdown-1.4.1-01", |
| 206 |
least_recent_timestamp => "f41538b878", |
| 207 |
max_file_size => "5f5e100", |
| 208 |
most_recent_timestamp => "f77e2cc520" |
| 209 |
node_address => "1.2.3.4", |
| 210 |
node_port => 369, |
| 211 |
operating_system => "Linux", |
| 212 |
operating_system_version => "2.4.20", |
| 213 |
routing_time => "a5", |
| 214 |
} |
| 215 |
|
| 216 |
=cut |
| 217 |
|
| 218 |
$txn->(client_info => sub { |
| 219 |
my ($self) = @_; |
| 220 |
|
| 221 |
$self->txn ("client_info"); |
| 222 |
}); |
| 223 |
|
| 224 |
=item $txn = $fcp->txn_generate_chk ($metadata, $data[, $cipher]) |
| 225 |
|
| 226 |
=item $uri = $fcp->generate_chk ($metadata, $data[, $cipher]) |
| 227 |
|
| 228 |
Calculates a CHK, given the metadata and data. C<$cipher> is either |
| 229 |
C<Rijndael> or C<Twofish>, with the latter being the default. |
| 230 |
|
| 231 |
=cut |
| 232 |
|
| 233 |
$txn->(generate_chk => sub { |
| 234 |
my ($self, $metadata, $data, $cipher) = @_; |
| 235 |
|
| 236 |
$metadata = Net::FCP::Metadata::build_metadata $metadata; |
| 237 |
|
| 238 |
$self->txn (generate_chk => |
| 239 |
data => "$metadata$data", |
| 240 |
metadata_length => xeh length $metadata, |
| 241 |
cipher => $cipher || "Twofish"); |
| 242 |
}); |
| 243 |
|
| 244 |
=item $txn = $fcp->txn_generate_svk_pair |
| 245 |
|
| 246 |
=item ($public, $private, $crypto) = @{ $fcp->generate_svk_pair } |
| 247 |
|
| 248 |
Creates a new SVK pair. Returns an arrayref with the public key, the |
| 249 |
private key and a crypto key, which is just additional entropy. |
| 250 |
|
| 251 |
[ |
| 252 |
"acLx4dux9fvvABH15Gk6~d3I-yw", |
| 253 |
"cPoDkDMXDGSMM32plaPZDhJDxSs", |
| 254 |
"BH7LXCov0w51-y9i~BoB3g", |
| 255 |
] |
| 256 |
|
| 257 |
A private key (for inserting) can be constructed like this: |
| 258 |
|
| 259 |
SSK@<private_key>,<crypto_key>/<name> |
| 260 |
|
| 261 |
It can be used to insert data. The corresponding public key looks like this: |
| 262 |
|
| 263 |
SSK@<public_key>PAgM,<crypto_key>/<name> |
| 264 |
|
| 265 |
Watch out for the C<PAgM>-part! |
| 266 |
|
| 267 |
=cut |
| 268 |
|
| 269 |
$txn->(generate_svk_pair => sub { |
| 270 |
my ($self) = @_; |
| 271 |
|
| 272 |
$self->txn ("generate_svk_pair"); |
| 273 |
}); |
| 274 |
|
| 275 |
=item $txn = $fcp->txn_invert_private_key ($private) |
| 276 |
|
| 277 |
=item $public = $fcp->invert_private_key ($private) |
| 278 |
|
| 279 |
Inverts a private key (returns the public key). C<$private> can be either |
| 280 |
an insert URI (must start with C<freenet:SSK@>) or a raw private key (i.e. |
| 281 |
the private value you get back from C<generate_svk_pair>). |
| 282 |
|
| 283 |
Returns the public key. |
| 284 |
|
| 285 |
=cut |
| 286 |
|
| 287 |
$txn->(invert_private_key => sub { |
| 288 |
my ($self, $privkey) = @_; |
| 289 |
|
| 290 |
$self->txn (invert_private_key => private => $privkey); |
| 291 |
}); |
| 292 |
|
| 293 |
=item $txn = $fcp->txn_get_size ($uri) |
| 294 |
|
| 295 |
=item $length = $fcp->get_size ($uri) |
| 296 |
|
| 297 |
Finds and returns the size (rounded up to the nearest power of two) of the |
| 298 |
given document. |
| 299 |
|
| 300 |
=cut |
| 301 |
|
| 302 |
$txn->(get_size => sub { |
| 303 |
my ($self, $uri) = @_; |
| 304 |
|
| 305 |
$self->txn (get_size => URI => $uri); |
| 306 |
}); |
| 307 |
|
| 308 |
=item $txn = $fcp->txn_client_get ($uri [, $htl = 15 [, $removelocal = 0]]) |
| 309 |
|
| 310 |
=item ($metadata, $data) = @{ $fcp->client_get ($uri, $htl, $removelocal) |
| 311 |
|
| 312 |
Fetches a (small, as it should fit into memory) key content block from |
| 313 |
freenet. C<$meta> is a C<Net::FCP::Metadata> object or C<undef>). |
| 314 |
|
| 315 |
The C<$uri> should begin with C<freenet:>, but the scheme is currently |
| 316 |
added, if missing. |
| 317 |
|
| 318 |
my ($meta, $data) = @{ |
| 319 |
$fcp->client_get ( |
| 320 |
"freenet:CHK@hdXaxkwZ9rA8-SidT0AN-bniQlgPAwI,XdCDmBuGsd-ulqbLnZ8v~w" |
| 321 |
) |
| 322 |
}; |
| 323 |
|
| 324 |
=cut |
| 325 |
|
| 326 |
$txn->(client_get => sub { |
| 327 |
my ($self, $uri, $htl, $removelocal) = @_; |
| 328 |
|
| 329 |
$uri =~ s/^freenet://; $uri = "freenet:$uri"; |
| 330 |
|
| 331 |
$self->txn (client_get => URI => $uri, hops_to_live => xeh (defined $htl ? $htl : 15), |
| 332 |
remove_local_key => $removelocal ? "true" : "false"); |
| 333 |
}); |
| 334 |
|
| 335 |
=item $txn = $fcp->txn_client_put ($uri, $metadata, $data, $htl, $removelocal) |
| 336 |
|
| 337 |
=item my $uri = $fcp->client_put ($uri, $metadata, $data, $htl, $removelocal); |
| 338 |
|
| 339 |
Insert a new key. If the client is inserting a CHK, the URI may be |
| 340 |
abbreviated as just CHK@. In this case, the node will calculate the |
| 341 |
CHK. If the key is a private SSK key, the node will calculcate the public |
| 342 |
key and the resulting public URI. |
| 343 |
|
| 344 |
C<$meta> can be a hash reference (same format as returned by |
| 345 |
C<Net::FCP::parse_metadata>) or a string. |
| 346 |
|
| 347 |
The result is an arrayref with the keys C<uri>, C<public_key> and C<private_key>. |
| 348 |
|
| 349 |
=cut |
| 350 |
|
| 351 |
$txn->(client_put => sub { |
| 352 |
my ($self, $uri, $metadata, $data, $htl, $removelocal) = @_; |
| 353 |
|
| 354 |
$metadata = Net::FCP::Metadata::build_metadata $metadata; |
| 355 |
$uri =~ s/^freenet://; $uri = "freenet:$uri"; |
| 356 |
|
| 357 |
$self->txn (client_put => URI => $uri, |
| 358 |
hops_to_live => xeh (defined $htl ? $htl : 15), |
| 359 |
remove_local_key => $removelocal ? "true" : "false", |
| 360 |
data => "$metadata$data", metadata_length => xeh length $metadata); |
| 361 |
}); |
| 362 |
|
| 363 |
} # transactions |
| 364 |
|
| 365 |
=back |
| 366 |
|
| 367 |
=head2 THE Net::FCP::Txn CLASS |
| 368 |
|
| 369 |
All requests (or transactions) are executed in a asynchronous way. For |
| 370 |
each request, a C<Net::FCP::Txn> object is created (worse: a tcp |
| 371 |
connection is created, too). |
| 372 |
|
| 373 |
For each request there is actually a different subclass (and it's possible |
| 374 |
to subclass these, although of course not documented). |
| 375 |
|
| 376 |
The most interesting method is C<result>. |
| 377 |
|
| 378 |
=over 4 |
| 379 |
|
| 380 |
=cut |
| 381 |
|
| 382 |
package Net::FCP::Txn; |
| 383 |
|
| 384 |
use Fcntl; |
| 385 |
use Socket; |
| 386 |
|
| 387 |
=item new arg => val,... |
| 388 |
|
| 389 |
Creates a new C<Net::FCP::Txn> object. Not normally used. |
| 390 |
|
| 391 |
=cut |
| 392 |
|
| 393 |
sub new { |
| 394 |
my $class = shift; |
| 395 |
my $self = bless { @_ }, $class; |
| 396 |
|
| 397 |
$self->{signal} = AnyEvent->condvar; |
| 398 |
|
| 399 |
$self->{fcp}{txn}{$self} = $self; |
| 400 |
|
| 401 |
my $attr = ""; |
| 402 |
my $data = delete $self->{attr}{data}; |
| 403 |
|
| 404 |
while (my ($k, $v) = each %{$self->{attr}}) { |
| 405 |
$attr .= (Net::FCP::touc $k) . "=$v\012" |
| 406 |
} |
| 407 |
|
| 408 |
if (defined $data) { |
| 409 |
$attr .= sprintf "DataLength=%x\012", length $data; |
| 410 |
$data = "Data\012$data"; |
| 411 |
} else { |
| 412 |
$data = "EndMessage\012"; |
| 413 |
} |
| 414 |
|
| 415 |
socket my $fh, PF_INET, SOCK_STREAM, 0 |
| 416 |
or Carp::croak "unable to create new tcp socket: $!"; |
| 417 |
binmode $fh, ":raw"; |
| 418 |
fcntl $fh, F_SETFL, O_NONBLOCK; |
| 419 |
connect $fh, (sockaddr_in $self->{fcp}{port}, inet_aton $self->{fcp}{host}); |
| 420 |
# and Carp::croak "FCP::txn: unable to connect to $self->{fcp}{host}:$self->{fcp}{port}: $!\n"; |
| 421 |
|
| 422 |
$self->{sbuf} = |
| 423 |
"\x00\x00\x00\x02" |
| 424 |
. (Net::FCP::touc $self->{type}) |
| 425 |
. "\012$attr$data"; |
| 426 |
|
| 427 |
#shutdown $fh, 1; # freenet buggy?, well, it's java... |
| 428 |
|
| 429 |
$self->{fh} = $fh; |
| 430 |
|
| 431 |
$self->{w} = AnyEvent->io (fh => $fh, poll => 'w', cb => sub { $self->fh_ready_w }); |
| 432 |
|
| 433 |
$self; |
| 434 |
} |
| 435 |
|
| 436 |
=item $txn = $txn->cb ($coderef) |
| 437 |
|
| 438 |
Sets a callback to be called when the request is finished. The coderef |
| 439 |
will be called with the txn as it's sole argument, so it has to call |
| 440 |
C<result> itself. |
| 441 |
|
| 442 |
Returns the txn object, useful for chaining. |
| 443 |
|
| 444 |
Example: |
| 445 |
|
| 446 |
$fcp->txn_client_get ("freenet:CHK....") |
| 447 |
->userdata ("ehrm") |
| 448 |
->cb(sub { |
| 449 |
my $data = shift->result; |
| 450 |
}); |
| 451 |
|
| 452 |
=cut |
| 453 |
|
| 454 |
sub cb($$) { |
| 455 |
my ($self, $cb) = @_; |
| 456 |
$self->{cb} = $cb; |
| 457 |
$self; |
| 458 |
} |
| 459 |
|
| 460 |
=item $txn = $txn->userdata ([$userdata]) |
| 461 |
|
| 462 |
Set user-specific data. This is useful in progress callbacks. The data can be accessed |
| 463 |
using C<< $txn->{userdata} >>. |
| 464 |
|
| 465 |
Returns the txn object, useful for chaining. |
| 466 |
|
| 467 |
=cut |
| 468 |
|
| 469 |
sub userdata($$) { |
| 470 |
my ($self, $data) = @_; |
| 471 |
$self->{userdata} = $data; |
| 472 |
$self; |
| 473 |
} |
| 474 |
|
| 475 |
=item $txn->cancel (%attr) |
| 476 |
|
| 477 |
Cancels the operation with a C<cancel> exception and the given attributes |
| 478 |
(consider at least giving the attribute C<reason>). |
| 479 |
|
| 480 |
UNTESTED. |
| 481 |
|
| 482 |
=cut |
| 483 |
|
| 484 |
sub cancel { |
| 485 |
my ($self, %attr) = @_; |
| 486 |
$self->throw (Net::FCP::Exception->new (cancel => { %attr })); |
| 487 |
$self->set_result; |
| 488 |
$self->eof; |
| 489 |
} |
| 490 |
|
| 491 |
sub fh_ready_w { |
| 492 |
my ($self) = @_; |
| 493 |
|
| 494 |
my $len = syswrite $self->{fh}, $self->{sbuf}; |
| 495 |
|
| 496 |
if ($len > 0) { |
| 497 |
substr $self->{sbuf}, 0, $len, ""; |
| 498 |
unless (length $self->{sbuf}) { |
| 499 |
fcntl $self->{fh}, F_SETFL, 0; |
| 500 |
$self->{w} = AnyEvent->io (fh => $self->{fh}, poll => 'r', cb => sub { $self->fh_ready_r }); |
| 501 |
} |
| 502 |
} elsif (defined $len) { |
| 503 |
$self->throw (Net::FCP::Exception->new (network_error => { reason => "unexpected end of file while writing" })); |
| 504 |
} else { |
| 505 |
$self->throw (Net::FCP::Exception->new (network_error => { reason => "$!" })); |
| 506 |
} |
| 507 |
} |
| 508 |
|
| 509 |
sub fh_ready_r { |
| 510 |
my ($self) = @_; |
| 511 |
|
| 512 |
if (sysread $self->{fh}, $self->{buf}, 16384 + 1024, length $self->{buf}) { |
| 513 |
for (;;) { |
| 514 |
if ($self->{datalen}) { |
| 515 |
#warn "expecting new datachunk $self->{datalen}, got ".(length $self->{buf})."\n";#d# |
| 516 |
if (length $self->{buf} >= $self->{datalen}) { |
| 517 |
$self->rcv_data (substr $self->{buf}, 0, delete $self->{datalen}, ""); |
| 518 |
} else { |
| 519 |
last; |
| 520 |
} |
| 521 |
} elsif ($self->{buf} =~ s/^DataChunk\015?\012Length=([0-9a-fA-F]+)\015?\012Data\015?\012//) { |
| 522 |
$self->{datalen} = hex $1; |
| 523 |
#warn "expecting new datachunk $self->{datalen}\n";#d# |
| 524 |
} elsif ($self->{buf} =~ s/^([a-zA-Z]+)\015?\012(?:(.+?)\015?\012)?EndMessage\015?\012//s) { |
| 525 |
$self->rcv ($1, { |
| 526 |
map { my ($a, $b) = split /=/, $_, 2; ((Net::FCP::tolc $a), $b) } |
| 527 |
split /\015?\012/, $2 |
| 528 |
}); |
| 529 |
} else { |
| 530 |
last; |
| 531 |
} |
| 532 |
} |
| 533 |
} else { |
| 534 |
$self->eof; |
| 535 |
} |
| 536 |
} |
| 537 |
|
| 538 |
sub rcv { |
| 539 |
my ($self, $type, $attr) = @_; |
| 540 |
|
| 541 |
$type = Net::FCP::tolc $type; |
| 542 |
|
| 543 |
#use PApp::Util; warn PApp::Util::dumpval [$type, $attr]; |
| 544 |
|
| 545 |
if (my $method = $self->can("rcv_$type")) { |
| 546 |
$method->($self, $attr, $type); |
| 547 |
} else { |
| 548 |
warn "received unexpected reply type '$type' for '$self->{type}', ignoring\n"; |
| 549 |
} |
| 550 |
} |
| 551 |
|
| 552 |
# used as a default exception thrower |
| 553 |
sub rcv_throw_exception { |
| 554 |
my ($self, $attr, $type) = @_; |
| 555 |
$self->throw (Net::FCP::Exception->new ($type, $attr)); |
| 556 |
} |
| 557 |
|
| 558 |
*rcv_failed = \&Net::FCP::Txn::rcv_throw_exception; |
| 559 |
*rcv_format_error = \&Net::FCP::Txn::rcv_throw_exception; |
| 560 |
|
| 561 |
sub throw { |
| 562 |
my ($self, $exc) = @_; |
| 563 |
|
| 564 |
$self->{exception} = $exc; |
| 565 |
$self->set_result; |
| 566 |
$self->eof; # must be last to avoid loops |
| 567 |
} |
| 568 |
|
| 569 |
sub set_result { |
| 570 |
my ($self, $result) = @_; |
| 571 |
|
| 572 |
unless (exists $self->{result}) { |
| 573 |
$self->{result} = $result; |
| 574 |
$self->{cb}->($self) if exists $self->{cb}; |
| 575 |
$self->{signal}->broadcast; |
| 576 |
} |
| 577 |
} |
| 578 |
|
| 579 |
sub eof { |
| 580 |
my ($self) = @_; |
| 581 |
|
| 582 |
delete $self->{w}; |
| 583 |
delete $self->{fh}; |
| 584 |
|
| 585 |
delete $self->{fcp}{txn}{$self}; |
| 586 |
|
| 587 |
unless (exists $self->{result}) { |
| 588 |
$self->throw (Net::FCP::Exception->new (short_data => { |
| 589 |
reason => "unexpected eof or internal node error", |
| 590 |
})); |
| 591 |
} |
| 592 |
} |
| 593 |
|
| 594 |
sub progress { |
| 595 |
my ($self, $type, $attr) = @_; |
| 596 |
|
| 597 |
$self->{fcp}->progress ($self, $type, $attr); |
| 598 |
} |
| 599 |
|
| 600 |
=item $result = $txn->result |
| 601 |
|
| 602 |
Waits until a result is available and then returns it. |
| 603 |
|
| 604 |
This waiting is (depending on your event model) not very efficient, as it |
| 605 |
is done outside the "mainloop". The biggest problem, however, is that it's |
| 606 |
blocking one thread of execution. Try to use the callback mechanism, if |
| 607 |
possible, and call result from within the callback (or after is has been |
| 608 |
run), as then no waiting is necessary. |
| 609 |
|
| 610 |
=cut |
| 611 |
|
| 612 |
sub result { |
| 613 |
my ($self) = @_; |
| 614 |
|
| 615 |
$self->{signal}->wait while !exists $self->{result}; |
| 616 |
|
| 617 |
die $self->{exception} if $self->{exception}; |
| 618 |
|
| 619 |
return $self->{result}; |
| 620 |
} |
| 621 |
|
| 622 |
package Net::FCP::Txn::ClientHello; |
| 623 |
|
| 624 |
use base Net::FCP::Txn; |
| 625 |
|
| 626 |
sub rcv_node_hello { |
| 627 |
my ($self, $attr) = @_; |
| 628 |
|
| 629 |
$self->set_result ($attr); |
| 630 |
} |
| 631 |
|
| 632 |
package Net::FCP::Txn::ClientInfo; |
| 633 |
|
| 634 |
use base Net::FCP::Txn; |
| 635 |
|
| 636 |
sub rcv_node_info { |
| 637 |
my ($self, $attr) = @_; |
| 638 |
|
| 639 |
$self->set_result ($attr); |
| 640 |
} |
| 641 |
|
| 642 |
package Net::FCP::Txn::GenerateCHK; |
| 643 |
|
| 644 |
use base Net::FCP::Txn; |
| 645 |
|
| 646 |
sub rcv_success { |
| 647 |
my ($self, $attr) = @_; |
| 648 |
|
| 649 |
$self->set_result ($attr->{uri}); |
| 650 |
} |
| 651 |
|
| 652 |
package Net::FCP::Txn::GenerateSVKPair; |
| 653 |
|
| 654 |
use base Net::FCP::Txn; |
| 655 |
|
| 656 |
sub rcv_success { |
| 657 |
my ($self, $attr) = @_; |
| 658 |
$self->set_result ([$attr->{public_key}, $attr->{private_key}, $attr->{crypto_key}]); |
| 659 |
} |
| 660 |
|
| 661 |
package Net::FCP::Txn::InvertPrivateKey; |
| 662 |
|
| 663 |
use base Net::FCP::Txn; |
| 664 |
|
| 665 |
sub rcv_success { |
| 666 |
my ($self, $attr) = @_; |
| 667 |
$self->set_result ($attr->{public_key}); |
| 668 |
} |
| 669 |
|
| 670 |
package Net::FCP::Txn::GetSize; |
| 671 |
|
| 672 |
use base Net::FCP::Txn; |
| 673 |
|
| 674 |
sub rcv_success { |
| 675 |
my ($self, $attr) = @_; |
| 676 |
$self->set_result (hex $attr->{length}); |
| 677 |
} |
| 678 |
|
| 679 |
package Net::FCP::Txn::GetPut; |
| 680 |
|
| 681 |
# base class for get and put |
| 682 |
|
| 683 |
use base Net::FCP::Txn; |
| 684 |
|
| 685 |
*rcv_uri_error = \&Net::FCP::Txn::rcv_throw_exception; |
| 686 |
*rcv_route_not_found = \&Net::FCP::Txn::rcv_throw_exception; |
| 687 |
|
| 688 |
sub rcv_restarted { |
| 689 |
my ($self, $attr, $type) = @_; |
| 690 |
|
| 691 |
delete $self->{datalength}; |
| 692 |
delete $self->{metalength}; |
| 693 |
delete $self->{data}; |
| 694 |
|
| 695 |
$self->progress ($type, $attr); |
| 696 |
} |
| 697 |
|
| 698 |
package Net::FCP::Txn::ClientGet; |
| 699 |
|
| 700 |
use base Net::FCP::Txn::GetPut; |
| 701 |
|
| 702 |
*rcv_data_not_found = \&Net::FCP::Txn::rcv_throw_exception; |
| 703 |
|
| 704 |
sub rcv_data { |
| 705 |
my ($self, $chunk) = @_; |
| 706 |
|
| 707 |
$self->{data} .= $chunk; |
| 708 |
|
| 709 |
$self->progress ("data", { chunk => length $chunk, received => length $self->{data}, total => $self->{datalength} }); |
| 710 |
|
| 711 |
if ($self->{datalength} == length $self->{data}) { |
| 712 |
my $data = delete $self->{data}; |
| 713 |
my $meta = new Net::FCP::Metadata (substr $data, 0, $self->{metalength}, ""); |
| 714 |
|
| 715 |
$self->set_result ([$meta, $data]); |
| 716 |
$self->eof; |
| 717 |
} |
| 718 |
} |
| 719 |
|
| 720 |
sub rcv_data_found { |
| 721 |
my ($self, $attr, $type) = @_; |
| 722 |
|
| 723 |
$self->progress ($type, $attr); |
| 724 |
|
| 725 |
$self->{datalength} = hex $attr->{data_length}; |
| 726 |
$self->{metalength} = hex $attr->{metadata_length}; |
| 727 |
} |
| 728 |
|
| 729 |
package Net::FCP::Txn::ClientPut; |
| 730 |
|
| 731 |
use base Net::FCP::Txn::GetPut; |
| 732 |
|
| 733 |
*rcv_size_error = \&Net::FCP::Txn::rcv_throw_exception; |
| 734 |
|
| 735 |
sub rcv_pending { |
| 736 |
my ($self, $attr, $type) = @_; |
| 737 |
$self->progress ($type, $attr); |
| 738 |
} |
| 739 |
|
| 740 |
sub rcv_success { |
| 741 |
my ($self, $attr, $type) = @_; |
| 742 |
$self->set_result ($attr); |
| 743 |
} |
| 744 |
|
| 745 |
sub rcv_key_collision { |
| 746 |
my ($self, $attr, $type) = @_; |
| 747 |
$self->set_result ({ key_collision => 1, %$attr }); |
| 748 |
} |
| 749 |
|
| 750 |
=back |
| 751 |
|
| 752 |
=head2 The Net::FCP::Exception CLASS |
| 753 |
|
| 754 |
Any unexpected (non-standard) responses that make it impossible to return |
| 755 |
the advertised result will result in an exception being thrown when the |
| 756 |
C<result> method is called. |
| 757 |
|
| 758 |
These exceptions are represented by objects of this class. |
| 759 |
|
| 760 |
=over 4 |
| 761 |
|
| 762 |
=cut |
| 763 |
|
| 764 |
package Net::FCP::Exception; |
| 765 |
|
| 766 |
use overload |
| 767 |
'""' => sub { |
| 768 |
"Net::FCP::Exception<<$_[0][0]," . (join ":", %{$_[0][1]}) . ">>"; |
| 769 |
}; |
| 770 |
|
| 771 |
=item $exc = new Net::FCP::Exception $type, \%attr |
| 772 |
|
| 773 |
Create a new exception object of the given type (a string like |
| 774 |
C<route_not_found>), and a hashref containing additional attributes |
| 775 |
(usually the attributes of the message causing the exception). |
| 776 |
|
| 777 |
=cut |
| 778 |
|
| 779 |
sub new { |
| 780 |
my ($class, $type, $attr) = @_; |
| 781 |
|
| 782 |
bless [Net::FCP::tolc $type, { %$attr }], $class; |
| 783 |
} |
| 784 |
|
| 785 |
=item $exc->type([$type]) |
| 786 |
|
| 787 |
With no arguments, returns the exception type. Otherwise a boolean |
| 788 |
indicating wether the exception is of the given type is returned. |
| 789 |
|
| 790 |
=cut |
| 791 |
|
| 792 |
sub type { |
| 793 |
my ($self, $type) = @_; |
| 794 |
|
| 795 |
@_ >= 2 |
| 796 |
? $self->[0] eq $type |
| 797 |
: $self->[0]; |
| 798 |
} |
| 799 |
|
| 800 |
=item $exc->attr([$attr]) |
| 801 |
|
| 802 |
With no arguments, returns the attributes. Otherwise the named attribute |
| 803 |
value is returned. |
| 804 |
|
| 805 |
=cut |
| 806 |
|
| 807 |
sub attr { |
| 808 |
my ($self, $attr) = @_; |
| 809 |
|
| 810 |
@_ >= 2 |
| 811 |
? $self->[1]{$attr} |
| 812 |
: $self->[1]; |
| 813 |
} |
| 814 |
|
| 815 |
=back |
| 816 |
|
| 817 |
=head1 SEE ALSO |
| 818 |
|
| 819 |
L<http://freenet.sf.net>. |
| 820 |
|
| 821 |
=head1 BUGS |
| 822 |
|
| 823 |
=head1 AUTHOR |
| 824 |
|
| 825 |
Marc Lehmann <schmorp@schmorp.de> |
| 826 |
http://home.schmorp.de/ |
| 827 |
|
| 828 |
=cut |
| 829 |
|
| 830 |
1 |
| 831 |
|
