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package Plack::Middleware::StackTrace; |
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435841
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use strict; |
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use warnings; |
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use parent qw/Plack::Middleware/; |
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use Devel::StackTrace; |
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24180
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use Devel::StackTrace::AsHTML; |
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64784
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use Scalar::Util qw( refaddr ); |
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use Try::Tiny; |
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16690
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use Plack::Util::Accessor qw( force no_print_errors ); |
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our $StackTraceClass = "Devel::StackTrace"; |
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# Optional since it needs PadWalker |
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if (try { require Devel::StackTrace::WithLexicals; Devel::StackTrace::WithLexicals->VERSION(0.08); 1 }) { |
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$StackTraceClass = "Devel::StackTrace::WithLexicals"; |
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} |
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sub call { |
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my($self, $env) = @_; |
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my ($trace, %string_traces, %ref_traces); |
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local $SIG{__DIE__} = sub { |
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$trace = $StackTraceClass->new( |
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indent => 1, message => munge_error($_[0], [ caller ]), |
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ignore_package => __PACKAGE__, no_refs => 1, |
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); |
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if (ref $_[0]) { |
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$ref_traces{refaddr($_[0])} ||= $trace; |
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} |
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else { |
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$string_traces{$_[0]} ||= $trace; |
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} |
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die @_; |
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}; |
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my $caught; |
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my $res = try { |
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$self->app->($env); |
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} catch { |
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$caught = $_; |
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[ 500, [ "Content-Type", "text/plain; charset=utf-8" ], [ no_trace_error(utf8_safe($caught)) ] ]; |
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}; |
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if ($caught) { |
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# Try to find the correct trace for the caught exception |
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my $caught_trace; |
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if (ref $caught) { |
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$caught_trace = $ref_traces{refaddr($caught)}; |
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} |
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else { |
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# This is not guaranteed to work if multiple exceptions with |
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# the same message are thrown. |
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5
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$caught_trace = $string_traces{$caught}; |
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} |
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$trace = $caught_trace if $caught_trace; |
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} |
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if ($trace && ($caught || ($self->force && ref $res eq 'ARRAY' && $res->[0] == 500)) ) { |
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9430
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my $text = $trace->as_string; |
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my $html = $trace->as_html; |
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$env->{'plack.stacktrace.text'} = $text; |
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$env->{'plack.stacktrace.html'} = $html; |
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$env->{'psgi.errors'}->print($text) unless $self->no_print_errors; |
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if (($env->{HTTP_ACCEPT} || '*/*') =~ /html/) { |
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1
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$res = [500, ['Content-Type' => 'text/html; charset=utf-8'], [ utf8_safe($html) ]]; |
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} else { |
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$res = [500, ['Content-Type' => 'text/plain; charset=utf-8'], [ utf8_safe($text) ]]; |
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} |
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} |
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# break $trace here since $SIG{__DIE__} holds the ref to it, and |
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# $trace has refs to Standalone.pm's args ($conn etc.) and |
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# prevents garbage collection to be happening. |
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undef $trace; |
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return $res; |
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} |
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sub no_trace_error { |
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0
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my $msg = shift; |
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chomp($msg); |
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return <
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The application raised the following error: |
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$msg |
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and the StackTrace middleware couldn't catch its stack trace, possibly because your application overrides \$SIG{__DIE__} by itself, preventing the middleware from working correctly. Remove the offending code or module that does it: known examples are CGI::Carp and Carp::Always. |
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EOF |
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} |
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92
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sub munge_error { |
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14
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0
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my($err, $caller) = @_; |
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100
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return $err if ref $err; |
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# Ugly hack to remove " at ... line ..." automatically appended by perl |
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# If there's a proper way to do this, please let me know. |
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10
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240
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$err =~ s/ at \Q$caller->[1]\E line $caller->[2]\.\n$//; |
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100
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return $err; |
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} |
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103
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sub utf8_safe { |
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0
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my $str = shift; |
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106
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# NOTE: I know messing with utf8:: in the code is WRONG, but |
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# because we're running someone else's code that we can't |
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# guarantee which encoding an exception is encoded, there's no |
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# better way than doing this. The latest Devel::StackTrace::AsHTML |
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# (0.08 or later) encodes high-bit chars as HTML entities, so this |
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# path won't be executed. |
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50
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60
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if (utf8::is_utf8($str)) { |
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0
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0
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utf8::encode($str); |
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} |
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116
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15
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$str; |
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} |
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119
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1; |
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121
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__END__ |