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package AnyEvent::Handle; |
2 |
|
3 |
no warnings; |
4 |
use strict; |
5 |
|
6 |
use AnyEvent (); |
7 |
use AnyEvent::Util (); |
8 |
use Scalar::Util (); |
9 |
use Carp (); |
10 |
use Fcntl (); |
11 |
use Errno qw/EAGAIN EINTR/; |
12 |
|
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=head1 NAME |
14 |
|
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AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 |
|
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This module is experimental. |
18 |
|
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=cut |
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|
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our $VERSION = '0.04'; |
22 |
|
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=head1 SYNOPSIS |
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|
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use AnyEvent; |
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use AnyEvent::Handle; |
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|
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my $cv = AnyEvent->condvar; |
29 |
|
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my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
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|
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#TODO |
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|
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# or use the constructor to pass the callback: |
35 |
|
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my $ae_fh2 = |
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AnyEvent::Handle->new ( |
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fh => \*STDIN, |
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on_eof => sub { |
40 |
$cv->broadcast; |
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}, |
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#TODO |
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); |
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|
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$cv->wait; |
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|
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=head1 DESCRIPTION |
48 |
|
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This module is a helper module to make it easier to do event-based I/O on |
50 |
filehandles. For utility functions for doing non-blocking connects and accepts |
51 |
on sockets see L<AnyEvent::Util>. |
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|
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In the following, when the documentation refers to of "bytes" then this |
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means characters. As sysread and syswrite are used for all I/O, their |
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treatment of characters applies to this module as well. |
56 |
|
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All callbacks will be invoked with the handle object as their first |
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argument. |
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|
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=head1 METHODS |
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|
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=over 4 |
63 |
|
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=item B<new (%args)> |
65 |
|
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The constructor supports these arguments (all as key => value pairs). |
67 |
|
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=over 4 |
69 |
|
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=item fh => $filehandle [MANDATORY] |
71 |
|
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The filehandle this L<AnyEvent::Handle> object will operate on. |
73 |
|
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NOTE: The filehandle will be set to non-blocking (using |
75 |
AnyEvent::Util::fh_nonblocking). |
76 |
|
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=item on_eof => $cb->($self) |
78 |
|
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Set the callback to be called on EOF. |
80 |
|
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While not mandatory, it is highly recommended to set an eof callback, |
82 |
otherwise you might end up with a closed socket while you are still |
83 |
waiting for data. |
84 |
|
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=item on_error => $cb->($self) |
86 |
|
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This is the fatal error callback, that is called when, well, a fatal error |
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occurs, such as not being able to resolve the hostname, failure to connect |
89 |
or a read error. |
90 |
|
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The object will not be in a usable state when this callback has been |
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called. |
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|
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On callback entrance, the value of C<$!> contains the operating system |
95 |
error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
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|
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While not mandatory, it is I<highly> recommended to set this callback, as |
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you will not be notified of errors otherwise. The default simply calls |
99 |
die. |
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|
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=item on_read => $cb->($self) |
102 |
|
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This sets the default read callback, which is called when data arrives |
104 |
and no read request is in the queue. |
105 |
|
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To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
107 |
method or access the C<$self->{rbuf}> member directly. |
108 |
|
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When an EOF condition is detected then AnyEvent::Handle will first try to |
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feed all the remaining data to the queued callbacks and C<on_read> before |
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calling the C<on_eof> callback. If no progress can be made, then a fatal |
112 |
error will be raised (with C<$!> set to C<EPIPE>). |
113 |
|
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=item on_drain => $cb->() |
115 |
|
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This sets the callback that is called when the write buffer becomes empty |
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(or when the callback is set and the buffer is empty already). |
118 |
|
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To append to the write buffer, use the C<< ->push_write >> method. |
120 |
|
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=item rbuf_max => <bytes> |
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|
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If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
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when the read buffer ever (strictly) exceeds this size. This is useful to |
125 |
avoid denial-of-service attacks. |
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|
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For example, a server accepting connections from untrusted sources should |
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be configured to accept only so-and-so much data that it cannot act on |
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(for example, when expecting a line, an attacker could send an unlimited |
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amount of data without a callback ever being called as long as the line |
131 |
isn't finished). |
132 |
|
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=item read_size => <bytes> |
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|
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The default read block size (the amount of bytes this module will try to read |
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on each [loop iteration). Default: C<4096>. |
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|
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=item low_water_mark => <bytes> |
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|
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Sets the amount of bytes (default: C<0>) that make up an "empty" write |
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buffer: If the write reaches this size or gets even samller it is |
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considered empty. |
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|
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=item tls => "accept" | "connect" | Net::SSLeay::SSL object |
145 |
|
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When this parameter is given, it enables TLS (SSL) mode, that means it |
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will start making tls handshake and will transparently encrypt/decrypt |
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data. |
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|
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TLS mode requires Net::SSLeay to be installed (it will be loaded |
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automatically when you try to create a TLS handle). |
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|
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For the TLS server side, use C<accept>, and for the TLS client side of a |
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connection, use C<connect> mode. |
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|
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You can also provide your own TLS connection object, but you have |
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to make sure that you call either C<Net::SSLeay::set_connect_state> |
158 |
or C<Net::SSLeay::set_accept_state> on it before you pass it to |
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AnyEvent::Handle. |
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|
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See the C<starttls> method if you need to start TLs negotiation later. |
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|
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=item tls_ctx => $ssl_ctx |
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|
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Use the given Net::SSLeay::CTX object to create the new TLS connection |
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(unless a connection object was specified directly). If this parameter is |
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missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
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|
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=back |
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|
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=cut |
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|
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our (%RH, %WH); |
174 |
|
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sub register_read_type($$) { |
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$RH{$_[0]} = $_[1]; |
177 |
} |
178 |
|
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sub register_write_type($$) { |
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$WH{$_[0]} = $_[1]; |
181 |
} |
182 |
|
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sub new { |
184 |
my $class = shift; |
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|
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my $self = bless { @_ }, $class; |
187 |
|
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$self->{fh} or Carp::croak "mandatory argument fh is missing"; |
189 |
|
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AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
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|
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if ($self->{tls}) { |
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require Net::SSLeay; |
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$self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
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} |
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|
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$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
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$self->on_error (delete $self->{on_error}) if $self->{on_error}; |
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$self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
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$self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
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|
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$self->start_read; |
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|
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$self |
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} |
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|
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sub _shutdown { |
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my ($self) = @_; |
209 |
|
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delete $self->{rw}; |
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delete $self->{ww}; |
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delete $self->{fh}; |
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} |
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|
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sub error { |
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my ($self) = @_; |
217 |
|
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{ |
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local $!; |
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$self->_shutdown; |
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} |
222 |
|
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if ($self->{on_error}) { |
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$self->{on_error}($self); |
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} else { |
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Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
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} |
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} |
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|
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=item $fh = $handle->fh |
231 |
|
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This method returns the file handle of the L<AnyEvent::Handle> object. |
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|
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=cut |
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|
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sub fh { $_[0]->{fh} } |
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|
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=item $handle->on_error ($cb) |
239 |
|
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Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
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|
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=cut |
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|
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sub on_error { |
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$_[0]{on_error} = $_[1]; |
246 |
} |
247 |
|
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=item $handle->on_eof ($cb) |
249 |
|
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Replace the current C<on_eof> callback (see the C<on_eof> constructor argument). |
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|
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=cut |
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|
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sub on_eof { |
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$_[0]{on_eof} = $_[1]; |
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} |
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|
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############################################################################# |
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|
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=back |
261 |
|
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=head2 WRITE QUEUE |
263 |
|
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AnyEvent::Handle manages two queues per handle, one for writing and one |
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for reading. |
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|
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The write queue is very simple: you can add data to its end, and |
268 |
AnyEvent::Handle will automatically try to get rid of it for you. |
269 |
|
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When data could be written and the write buffer is shorter then the low |
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water mark, the C<on_drain> callback will be invoked. |
272 |
|
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=over 4 |
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|
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=item $handle->on_drain ($cb) |
276 |
|
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Sets the C<on_drain> callback or clears it (see the description of |
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C<on_drain> in the constructor). |
279 |
|
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=cut |
281 |
|
282 |
sub on_drain { |
283 |
my ($self, $cb) = @_; |
284 |
|
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$self->{on_drain} = $cb; |
286 |
|
287 |
$cb->($self) |
288 |
if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
289 |
} |
290 |
|
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=item $handle->push_write ($data) |
292 |
|
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Queues the given scalar to be written. You can push as much data as you |
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want (only limited by the available memory), as C<AnyEvent::Handle> |
295 |
buffers it independently of the kernel. |
296 |
|
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=cut |
298 |
|
299 |
sub _drain_wbuf { |
300 |
my ($self) = @_; |
301 |
|
302 |
if (!$self->{ww} && length $self->{wbuf}) { |
303 |
Scalar::Util::weaken $self; |
304 |
my $cb = sub { |
305 |
my $len = syswrite $self->{fh}, $self->{wbuf}; |
306 |
|
307 |
if ($len >= 0) { |
308 |
substr $self->{wbuf}, 0, $len, ""; |
309 |
|
310 |
$self->{on_drain}($self) |
311 |
if $self->{low_water_mark} >= length $self->{wbuf} |
312 |
&& $self->{on_drain}; |
313 |
|
314 |
delete $self->{ww} unless length $self->{wbuf}; |
315 |
} elsif ($! != EAGAIN && $! != EINTR) { |
316 |
$self->error; |
317 |
} |
318 |
}; |
319 |
|
320 |
$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
321 |
|
322 |
$cb->($self); |
323 |
}; |
324 |
} |
325 |
|
326 |
sub push_write { |
327 |
my $self = shift; |
328 |
|
329 |
if (@_ > 1) { |
330 |
my $type = shift; |
331 |
|
332 |
@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
333 |
->($self, @_); |
334 |
} |
335 |
|
336 |
if ($self->{filter_w}) { |
337 |
$self->{filter_w}->($self, \$_[0]); |
338 |
} else { |
339 |
$self->{wbuf} .= $_[0]; |
340 |
$self->_drain_wbuf; |
341 |
} |
342 |
} |
343 |
|
344 |
=item $handle->push_write (type => @args) |
345 |
|
346 |
=item $handle->unshift_write (type => @args) |
347 |
|
348 |
Instead of formatting your data yourself, you can also let this module do |
349 |
the job by specifying a type and type-specific arguments. |
350 |
|
351 |
Predefined types are: |
352 |
|
353 |
=over 4 |
354 |
|
355 |
=item netstring => $string |
356 |
|
357 |
Formats the given value as netstring |
358 |
(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
359 |
|
360 |
=cut |
361 |
|
362 |
register_write_type netstring => sub { |
363 |
my ($self, $string) = @_; |
364 |
|
365 |
sprintf "%d:%s,", (length $string), $string |
366 |
}; |
367 |
|
368 |
=back |
369 |
|
370 |
=cut |
371 |
|
372 |
|
373 |
|
374 |
############################################################################# |
375 |
|
376 |
=back |
377 |
|
378 |
=head2 READ QUEUE |
379 |
|
380 |
AnyEvent::Handle manages two queues per handle, one for writing and one |
381 |
for reading. |
382 |
|
383 |
The read queue is more complex than the write queue. It can be used in two |
384 |
ways, the "simple" way, using only C<on_read> and the "complex" way, using |
385 |
a queue. |
386 |
|
387 |
In the simple case, you just install an C<on_read> callback and whenever |
388 |
new data arrives, it will be called. You can then remove some data (if |
389 |
enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
390 |
or not. |
391 |
|
392 |
In the more complex case, you want to queue multiple callbacks. In this |
393 |
case, AnyEvent::Handle will call the first queued callback each time new |
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data arrives and removes it when it has done its job (see C<push_read>, |
395 |
below). |
396 |
|
397 |
This way you can, for example, push three line-reads, followed by reading |
398 |
a chunk of data, and AnyEvent::Handle will execute them in order. |
399 |
|
400 |
Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
401 |
the specified number of bytes which give an XML datagram. |
402 |
|
403 |
# in the default state, expect some header bytes |
404 |
$handle->on_read (sub { |
405 |
# some data is here, now queue the length-header-read (4 octets) |
406 |
shift->unshift_read_chunk (4, sub { |
407 |
# header arrived, decode |
408 |
my $len = unpack "N", $_[1]; |
409 |
|
410 |
# now read the payload |
411 |
shift->unshift_read_chunk ($len, sub { |
412 |
my $xml = $_[1]; |
413 |
# handle xml |
414 |
}); |
415 |
}); |
416 |
}); |
417 |
|
418 |
Example 2: Implement a client for a protocol that replies either with |
419 |
"OK" and another line or "ERROR" for one request, and 64 bytes for the |
420 |
second request. Due tot he availability of a full queue, we can just |
421 |
pipeline sending both requests and manipulate the queue as necessary in |
422 |
the callbacks: |
423 |
|
424 |
# request one |
425 |
$handle->push_write ("request 1\015\012"); |
426 |
|
427 |
# we expect "ERROR" or "OK" as response, so push a line read |
428 |
$handle->push_read_line (sub { |
429 |
# if we got an "OK", we have to _prepend_ another line, |
430 |
# so it will be read before the second request reads its 64 bytes |
431 |
# which are already in the queue when this callback is called |
432 |
# we don't do this in case we got an error |
433 |
if ($_[1] eq "OK") { |
434 |
$_[0]->unshift_read_line (sub { |
435 |
my $response = $_[1]; |
436 |
... |
437 |
}); |
438 |
} |
439 |
}); |
440 |
|
441 |
# request two |
442 |
$handle->push_write ("request 2\015\012"); |
443 |
|
444 |
# simply read 64 bytes, always |
445 |
$handle->push_read_chunk (64, sub { |
446 |
my $response = $_[1]; |
447 |
... |
448 |
}); |
449 |
|
450 |
=over 4 |
451 |
|
452 |
=cut |
453 |
|
454 |
sub _drain_rbuf { |
455 |
my ($self) = @_; |
456 |
|
457 |
if ( |
458 |
defined $self->{rbuf_max} |
459 |
&& $self->{rbuf_max} < length $self->{rbuf} |
460 |
) { |
461 |
$! = &Errno::ENOSPC; return $self->error; |
462 |
} |
463 |
|
464 |
return if $self->{in_drain}; |
465 |
local $self->{in_drain} = 1; |
466 |
|
467 |
while (my $len = length $self->{rbuf}) { |
468 |
no strict 'refs'; |
469 |
if (my $cb = shift @{ $self->{queue} }) { |
470 |
unless ($cb->($self)) { |
471 |
if ($self->{eof}) { |
472 |
# no progress can be made (not enough data and no data forthcoming) |
473 |
$! = &Errno::EPIPE; return $self->error; |
474 |
} |
475 |
|
476 |
unshift @{ $self->{queue} }, $cb; |
477 |
return; |
478 |
} |
479 |
} elsif ($self->{on_read}) { |
480 |
$self->{on_read}($self); |
481 |
|
482 |
if ( |
483 |
$self->{eof} # if no further data will arrive |
484 |
&& $len == length $self->{rbuf} # and no data has been consumed |
485 |
&& !@{ $self->{queue} } # and the queue is still empty |
486 |
&& $self->{on_read} # and we still want to read data |
487 |
) { |
488 |
# then no progress can be made |
489 |
$! = &Errno::EPIPE; return $self->error; |
490 |
} |
491 |
} else { |
492 |
# read side becomes idle |
493 |
delete $self->{rw}; |
494 |
return; |
495 |
} |
496 |
} |
497 |
|
498 |
if ($self->{eof}) { |
499 |
$self->_shutdown; |
500 |
$self->{on_eof}($self) |
501 |
if $self->{on_eof}; |
502 |
} |
503 |
} |
504 |
|
505 |
=item $handle->on_read ($cb) |
506 |
|
507 |
This replaces the currently set C<on_read> callback, or clears it (when |
508 |
the new callback is C<undef>). See the description of C<on_read> in the |
509 |
constructor. |
510 |
|
511 |
=cut |
512 |
|
513 |
sub on_read { |
514 |
my ($self, $cb) = @_; |
515 |
|
516 |
$self->{on_read} = $cb; |
517 |
} |
518 |
|
519 |
=item $handle->rbuf |
520 |
|
521 |
Returns the read buffer (as a modifiable lvalue). |
522 |
|
523 |
You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
524 |
you want. |
525 |
|
526 |
NOTE: The read buffer should only be used or modified if the C<on_read>, |
527 |
C<push_read> or C<unshift_read> methods are used. The other read methods |
528 |
automatically manage the read buffer. |
529 |
|
530 |
=cut |
531 |
|
532 |
sub rbuf : lvalue { |
533 |
$_[0]{rbuf} |
534 |
} |
535 |
|
536 |
=item $handle->push_read ($cb) |
537 |
|
538 |
=item $handle->unshift_read ($cb) |
539 |
|
540 |
Append the given callback to the end of the queue (C<push_read>) or |
541 |
prepend it (C<unshift_read>). |
542 |
|
543 |
The callback is called each time some additional read data arrives. |
544 |
|
545 |
It must check whether enough data is in the read buffer already. |
546 |
|
547 |
If not enough data is available, it must return the empty list or a false |
548 |
value, in which case it will be called repeatedly until enough data is |
549 |
available (or an error condition is detected). |
550 |
|
551 |
If enough data was available, then the callback must remove all data it is |
552 |
interested in (which can be none at all) and return a true value. After returning |
553 |
true, it will be removed from the queue. |
554 |
|
555 |
=cut |
556 |
|
557 |
sub push_read { |
558 |
my $self = shift; |
559 |
my $cb = pop; |
560 |
|
561 |
if (@_) { |
562 |
my $type = shift; |
563 |
|
564 |
$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
565 |
->($self, $cb, @_); |
566 |
} |
567 |
|
568 |
push @{ $self->{queue} }, $cb; |
569 |
$self->_drain_rbuf; |
570 |
} |
571 |
|
572 |
sub unshift_read { |
573 |
my $self = shift; |
574 |
my $cb = pop; |
575 |
|
576 |
if (@_) { |
577 |
my $type = shift; |
578 |
|
579 |
$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
580 |
->($self, $cb, @_); |
581 |
} |
582 |
|
583 |
|
584 |
unshift @{ $self->{queue} }, $cb; |
585 |
$self->_drain_rbuf; |
586 |
} |
587 |
|
588 |
=item $handle->push_read (type => @args, $cb) |
589 |
|
590 |
=item $handle->unshift_read (type => @args, $cb) |
591 |
|
592 |
Instead of providing a callback that parses the data itself you can chose |
593 |
between a number of predefined parsing formats, for chunks of data, lines |
594 |
etc. |
595 |
|
596 |
The types currently supported are: |
597 |
|
598 |
=over 4 |
599 |
|
600 |
=item chunk => $octets, $cb->($self, $data) |
601 |
|
602 |
Invoke the callback only once C<$octets> bytes have been read. Pass the |
603 |
data read to the callback. The callback will never be called with less |
604 |
data. |
605 |
|
606 |
Example: read 2 bytes. |
607 |
|
608 |
$handle->push_read (chunk => 2, sub { |
609 |
warn "yay ", unpack "H*", $_[1]; |
610 |
}); |
611 |
|
612 |
=cut |
613 |
|
614 |
register_read_type chunk => sub { |
615 |
my ($self, $cb, $len) = @_; |
616 |
|
617 |
sub { |
618 |
$len <= length $_[0]{rbuf} or return; |
619 |
$cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
620 |
1 |
621 |
} |
622 |
}; |
623 |
|
624 |
# compatibility with older API |
625 |
sub push_read_chunk { |
626 |
$_[0]->push_read (chunk => $_[1], $_[2]); |
627 |
} |
628 |
|
629 |
sub unshift_read_chunk { |
630 |
$_[0]->unshift_read (chunk => $_[1], $_[2]); |
631 |
} |
632 |
|
633 |
=item line => [$eol, ]$cb->($self, $line, $eol) |
634 |
|
635 |
The callback will be called only once a full line (including the end of |
636 |
line marker, C<$eol>) has been read. This line (excluding the end of line |
637 |
marker) will be passed to the callback as second argument (C<$line>), and |
638 |
the end of line marker as the third argument (C<$eol>). |
639 |
|
640 |
The end of line marker, C<$eol>, can be either a string, in which case it |
641 |
will be interpreted as a fixed record end marker, or it can be a regex |
642 |
object (e.g. created by C<qr>), in which case it is interpreted as a |
643 |
regular expression. |
644 |
|
645 |
The end of line marker argument C<$eol> is optional, if it is missing (NOT |
646 |
undef), then C<qr|\015?\012|> is used (which is good for most internet |
647 |
protocols). |
648 |
|
649 |
Partial lines at the end of the stream will never be returned, as they are |
650 |
not marked by the end of line marker. |
651 |
|
652 |
=cut |
653 |
|
654 |
register_read_type line => sub { |
655 |
my ($self, $cb, $eol) = @_; |
656 |
|
657 |
$eol = qr|(\015?\012)| if @_ < 3; |
658 |
$eol = quotemeta $eol unless ref $eol; |
659 |
$eol = qr|^(.*?)($eol)|s; |
660 |
|
661 |
sub { |
662 |
$_[0]{rbuf} =~ s/$eol// or return; |
663 |
|
664 |
$cb->($_[0], $1, $2); |
665 |
1 |
666 |
} |
667 |
}; |
668 |
|
669 |
# compatibility with older API |
670 |
sub push_read_line { |
671 |
my $self = shift; |
672 |
$self->push_read (line => @_); |
673 |
} |
674 |
|
675 |
sub unshift_read_line { |
676 |
my $self = shift; |
677 |
$self->unshift_read (line => @_); |
678 |
} |
679 |
|
680 |
=item netstring => $cb->($string) |
681 |
|
682 |
A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
683 |
|
684 |
Throws an error with C<$!> set to EBADMSG on format violations. |
685 |
|
686 |
=cut |
687 |
|
688 |
register_read_type netstring => sub { |
689 |
my ($self, $cb) = @_; |
690 |
|
691 |
sub { |
692 |
unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
693 |
if ($_[0]{rbuf} =~ /[^0-9]/) { |
694 |
$! = &Errno::EBADMSG; |
695 |
$self->error; |
696 |
} |
697 |
return; |
698 |
} |
699 |
|
700 |
my $len = $1; |
701 |
|
702 |
$self->unshift_read (chunk => $len, sub { |
703 |
my $string = $_[1]; |
704 |
$_[0]->unshift_read (chunk => 1, sub { |
705 |
if ($_[1] eq ",") { |
706 |
$cb->($_[0], $string); |
707 |
} else { |
708 |
$! = &Errno::EBADMSG; |
709 |
$self->error; |
710 |
} |
711 |
}); |
712 |
}); |
713 |
|
714 |
1 |
715 |
} |
716 |
}; |
717 |
|
718 |
=back |
719 |
|
720 |
=item $handle->stop_read |
721 |
|
722 |
=item $handle->start_read |
723 |
|
724 |
In rare cases you actually do not want to read anything from the |
725 |
socket. In this case you can call C<stop_read>. Neither C<on_read> no |
726 |
any queued callbacks will be executed then. To start reading again, call |
727 |
C<start_read>. |
728 |
|
729 |
=cut |
730 |
|
731 |
sub stop_read { |
732 |
my ($self) = @_; |
733 |
|
734 |
delete $self->{rw}; |
735 |
} |
736 |
|
737 |
sub start_read { |
738 |
my ($self) = @_; |
739 |
|
740 |
unless ($self->{rw} || $self->{eof}) { |
741 |
Scalar::Util::weaken $self; |
742 |
|
743 |
$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
744 |
my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
745 |
my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
746 |
|
747 |
if ($len > 0) { |
748 |
$self->{filter_r} |
749 |
? $self->{filter_r}->($self, $rbuf) |
750 |
: $self->_drain_rbuf; |
751 |
|
752 |
} elsif (defined $len) { |
753 |
delete $self->{rw}; |
754 |
$self->{eof} = 1; |
755 |
$self->_drain_rbuf; |
756 |
|
757 |
} elsif ($! != EAGAIN && $! != EINTR) { |
758 |
return $self->error; |
759 |
} |
760 |
}); |
761 |
} |
762 |
} |
763 |
|
764 |
sub _dotls { |
765 |
my ($self) = @_; |
766 |
|
767 |
if (length $self->{tls_wbuf}) { |
768 |
while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
769 |
substr $self->{tls_wbuf}, 0, $len, ""; |
770 |
} |
771 |
} |
772 |
|
773 |
if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
774 |
$self->{wbuf} .= $buf; |
775 |
$self->_drain_wbuf; |
776 |
} |
777 |
|
778 |
while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
779 |
$self->{rbuf} .= $buf; |
780 |
$self->_drain_rbuf; |
781 |
} |
782 |
|
783 |
my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
784 |
|
785 |
if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
786 |
if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
787 |
$self->error; |
788 |
} elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
789 |
$! = &Errno::EIO; |
790 |
$self->error; |
791 |
} |
792 |
|
793 |
# all others are fine for our purposes |
794 |
} |
795 |
} |
796 |
|
797 |
=item $handle->starttls ($tls[, $tls_ctx]) |
798 |
|
799 |
Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
800 |
object is created, you can also do that at a later time by calling |
801 |
C<starttls>. |
802 |
|
803 |
The first argument is the same as the C<tls> constructor argument (either |
804 |
C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
805 |
|
806 |
The second argument is the optional C<Net::SSLeay::CTX> object that is |
807 |
used when AnyEvent::Handle has to create its own TLS connection object. |
808 |
|
809 |
=cut |
810 |
|
811 |
# TODO: maybe document... |
812 |
sub starttls { |
813 |
my ($self, $ssl, $ctx) = @_; |
814 |
|
815 |
$self->stoptls; |
816 |
|
817 |
if ($ssl eq "accept") { |
818 |
$ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
819 |
Net::SSLeay::set_accept_state ($ssl); |
820 |
} elsif ($ssl eq "connect") { |
821 |
$ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
822 |
Net::SSLeay::set_connect_state ($ssl); |
823 |
} |
824 |
|
825 |
$self->{tls} = $ssl; |
826 |
|
827 |
# basically, this is deep magic (because SSL_read should have the same issues) |
828 |
# but the openssl maintainers basically said: "trust us, it just works". |
829 |
# (unfortunately, we have to hardcode constants because the abysmally misdesigned |
830 |
# and mismaintained ssleay-module doesn't even offer them). |
831 |
# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
832 |
Net::SSLeay::CTX_set_mode ($self->{tls}, |
833 |
(eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
834 |
| (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
835 |
|
836 |
$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
837 |
$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
838 |
|
839 |
Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
840 |
|
841 |
$self->{filter_w} = sub { |
842 |
$_[0]{tls_wbuf} .= ${$_[1]}; |
843 |
&_dotls; |
844 |
}; |
845 |
$self->{filter_r} = sub { |
846 |
Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
847 |
&_dotls; |
848 |
}; |
849 |
} |
850 |
|
851 |
=item $handle->stoptls |
852 |
|
853 |
Destroys the SSL connection, if any. Partial read or write data will be |
854 |
lost. |
855 |
|
856 |
=cut |
857 |
|
858 |
sub stoptls { |
859 |
my ($self) = @_; |
860 |
|
861 |
Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
862 |
delete $self->{tls_rbio}; |
863 |
delete $self->{tls_wbio}; |
864 |
delete $self->{tls_wbuf}; |
865 |
delete $self->{filter_r}; |
866 |
delete $self->{filter_w}; |
867 |
} |
868 |
|
869 |
sub DESTROY { |
870 |
my $self = shift; |
871 |
|
872 |
$self->stoptls; |
873 |
} |
874 |
|
875 |
=item AnyEvent::Handle::TLS_CTX |
876 |
|
877 |
This function creates and returns the Net::SSLeay::CTX object used by |
878 |
default for TLS mode. |
879 |
|
880 |
The context is created like this: |
881 |
|
882 |
Net::SSLeay::load_error_strings; |
883 |
Net::SSLeay::SSLeay_add_ssl_algorithms; |
884 |
Net::SSLeay::randomize; |
885 |
|
886 |
my $CTX = Net::SSLeay::CTX_new; |
887 |
|
888 |
Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
889 |
|
890 |
=cut |
891 |
|
892 |
our $TLS_CTX; |
893 |
|
894 |
sub TLS_CTX() { |
895 |
$TLS_CTX || do { |
896 |
require Net::SSLeay; |
897 |
|
898 |
Net::SSLeay::load_error_strings (); |
899 |
Net::SSLeay::SSLeay_add_ssl_algorithms (); |
900 |
Net::SSLeay::randomize (); |
901 |
|
902 |
$TLS_CTX = Net::SSLeay::CTX_new (); |
903 |
|
904 |
Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
905 |
|
906 |
$TLS_CTX |
907 |
} |
908 |
} |
909 |
|
910 |
=back |
911 |
|
912 |
=head1 AUTHOR |
913 |
|
914 |
Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
915 |
|
916 |
=cut |
917 |
|
918 |
1; # End of AnyEvent::Handle |