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14 | |
14 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | =cut |
17 | =cut |
18 | |
18 | |
19 | our $VERSION = 4.22; |
19 | our $VERSION = 4.232; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
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49 | |
49 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
53 | |
53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
54 | In the following, when the documentation refers to of "bytes" then this |
57 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
58 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
57 | |
60 | |
58 | All callbacks will be invoked with the handle object as their first |
61 | All callbacks will be invoked with the handle object as their first |
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70 | |
73 | |
71 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [MANDATORY] |
72 | |
75 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
77 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
77 | |
81 | |
78 | =item on_eof => $cb->($handle) |
82 | =item on_eof => $cb->($handle) |
79 | |
83 | |
80 | Set the callback to be called when an end-of-file condition is detected, |
84 | Set the callback to be called when an end-of-file condition is detected, |
81 | i.e. in the case of a socket, when the other side has closed the |
85 | i.e. in the case of a socket, when the other side has closed the |
82 | connection cleanly. |
86 | connection cleanly. |
83 | |
87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the eof |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
93 | While not mandatory, it is I<highly> recommended to set an eof callback, |
85 | otherwise you might end up with a closed socket while you are still |
94 | otherwise you might end up with a closed socket while you are still |
86 | waiting for data. |
95 | waiting for data. |
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96 | |
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97 | If an EOF condition has been detected but no C<on_eof> callback has been |
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98 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
99 | |
88 | =item on_error => $cb->($handle, $fatal) |
100 | =item on_error => $cb->($handle, $fatal) |
89 | |
101 | |
90 | This is the error callback, which is called when, well, some error |
102 | This is the error callback, which is called when, well, some error |
91 | occured, such as not being able to resolve the hostname, failure to |
103 | occured, such as not being able to resolve the hostname, failure to |
92 | connect or a read error. |
104 | connect or a read error. |
93 | |
105 | |
94 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
95 | fatal errors the handle object will be shut down and will not be |
107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C< ->rbuf >). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
96 | usable. Non-fatal errors can be retried by simply returning, but it is |
112 | Non-fatal errors can be retried by simply returning, but it is recommended |
97 | recommended to simply ignore this parameter and instead abondon the handle |
113 | to simply ignore this parameter and instead abondon the handle object |
98 | object when this callback is invoked. |
114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
99 | |
116 | |
100 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
101 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
102 | |
119 | |
103 | While not mandatory, it is I<highly> recommended to set this callback, as |
120 | While not mandatory, it is I<highly> recommended to set this callback, as |
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288 | delete $self->{_rw}; |
305 | delete $self->{_rw}; |
289 | delete $self->{_ww}; |
306 | delete $self->{_ww}; |
290 | delete $self->{fh}; |
307 | delete $self->{fh}; |
291 | |
308 | |
292 | $self->stoptls; |
309 | $self->stoptls; |
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310 | |
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311 | delete $self->{on_read}; |
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312 | delete $self->{_queue}; |
293 | } |
313 | } |
294 | |
314 | |
295 | sub _error { |
315 | sub _error { |
296 | my ($self, $errno, $fatal) = @_; |
316 | my ($self, $errno, $fatal) = @_; |
297 | |
317 | |
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726 | |
746 | |
727 | if ( |
747 | if ( |
728 | defined $self->{rbuf_max} |
748 | defined $self->{rbuf_max} |
729 | && $self->{rbuf_max} < length $self->{rbuf} |
749 | && $self->{rbuf_max} < length $self->{rbuf} |
730 | ) { |
750 | ) { |
731 | return $self->_error (&Errno::ENOSPC, 1); |
751 | $self->_error (&Errno::ENOSPC, 1), return; |
732 | } |
752 | } |
733 | |
753 | |
734 | while () { |
754 | while () { |
735 | my $len = length $self->{rbuf}; |
755 | my $len = length $self->{rbuf}; |
736 | |
756 | |
737 | if (my $cb = shift @{ $self->{_queue} }) { |
757 | if (my $cb = shift @{ $self->{_queue} }) { |
738 | unless ($cb->($self)) { |
758 | unless ($cb->($self)) { |
739 | if ($self->{_eof}) { |
759 | if ($self->{_eof}) { |
740 | # no progress can be made (not enough data and no data forthcoming) |
760 | # no progress can be made (not enough data and no data forthcoming) |
741 | $self->_error (&Errno::EPIPE, 1), last; |
761 | $self->_error (&Errno::EPIPE, 1), return; |
742 | } |
762 | } |
743 | |
763 | |
744 | unshift @{ $self->{_queue} }, $cb; |
764 | unshift @{ $self->{_queue} }, $cb; |
745 | last; |
765 | last; |
746 | } |
766 | } |
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754 | && !@{ $self->{_queue} } # and the queue is still empty |
774 | && !@{ $self->{_queue} } # and the queue is still empty |
755 | && $self->{on_read} # but we still have on_read |
775 | && $self->{on_read} # but we still have on_read |
756 | ) { |
776 | ) { |
757 | # no further data will arrive |
777 | # no further data will arrive |
758 | # so no progress can be made |
778 | # so no progress can be made |
759 | $self->_error (&Errno::EPIPE, 1), last |
779 | $self->_error (&Errno::EPIPE, 1), return |
760 | if $self->{_eof}; |
780 | if $self->{_eof}; |
761 | |
781 | |
762 | last; # more data might arrive |
782 | last; # more data might arrive |
763 | } |
783 | } |
764 | } else { |
784 | } else { |
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766 | delete $self->{_rw}; |
786 | delete $self->{_rw}; |
767 | last; |
787 | last; |
768 | } |
788 | } |
769 | } |
789 | } |
770 | |
790 | |
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791 | if ($self->{_eof}) { |
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792 | if ($self->{on_eof}) { |
771 | $self->{on_eof}($self) |
793 | $self->{on_eof}($self) |
772 | if $self->{_eof} && $self->{on_eof}; |
794 | } else { |
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795 | $self->_error (0, 1); |
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796 | } |
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797 | } |
773 | |
798 | |
774 | # may need to restart read watcher |
799 | # may need to restart read watcher |
775 | unless ($self->{_rw}) { |
800 | unless ($self->{_rw}) { |
776 | $self->start_read |
801 | $self->start_read |
777 | if $self->{on_read} || @{ $self->{_queue} }; |
802 | if $self->{on_read} || @{ $self->{_queue} }; |