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1 | package Object::Remote::Logging::Router; |
2 | |
3 | use Moo; |
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4 | use Scalar::Util qw(weaken); |
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5 | use Sys::Hostname; |
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6 | |
7 | with 'Log::Contextual::Role::Router'; |
8 | with 'Object::Remote::Role::LogForwarder'; |
9 | |
10 | has _controller_package => ( is => 'rwp' ); |
11 | #lookup table for package names that should not |
12 | #be forwarded across Object::Remote connections |
13 | has _connections => ( is => 'ro', required => 1, default => sub { [] } ); |
14 | has _remote_metadata => ( is => 'rw' ); |
15 | |
16 | sub before_import { |
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17 | my ($self, $controller, $importer, $spec) = @_; |
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18 | } |
19 | |
20 | sub after_import { } |
21 | |
22 | sub _get_loggers { |
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23 | my ($self, %metadata) = @_; |
24 | my $package = $metadata{package}; |
25 | my $level = $metadata{level}; |
26 | my $is_level = "is_$level"; |
27 | my $need_clean = 0; |
28 | my @loggers; |
29 | |
30 | foreach my $selector (@{$self->_connections}) { |
31 | unless(defined $selector) { |
32 | $need_clean = 1; |
33 | next; |
34 | } |
35 | |
36 | foreach my $logger ($selector->($package, { %metadata })) { |
37 | next unless defined $logger; |
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38 | next unless $logger->$is_level; |
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39 | push(@loggers, $logger); |
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40 | } |
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41 | } |
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42 | |
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43 | $self->_clean_connections if $need_clean; |
44 | |
45 | return @loggers; |
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46 | } |
47 | |
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48 | #overloadable so a router can invoke a logger |
49 | #in a different way |
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50 | sub _invoke_logger { |
51 | my ($self, $logger, $level_name, $content, $metadata) = @_; |
52 | #Invoking the logger like this gets all available data to the |
53 | #logging object with out losing any information from the structure. |
54 | #This is not a backwards compatible way to invoke the loggers |
55 | #but it enables a lot of flexibility in the logger. |
56 | #The l-c router could have this method invoke the logger in |
57 | #a backwards compatible way and router sub classes invoke |
58 | #it in non-backwards compatible ways if desired |
59 | $logger->$level_name($content, $metadata); |
60 | } |
61 | |
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62 | #overloadable so forwarding can have the updated |
63 | #metadata but does not have to wrap get_loggers |
64 | #which has too many drawbacks |
65 | sub _deliver_message { |
66 | my ($self, $level, $generator, $args, $metadata) = @_; |
67 | my @loggers = $self->_get_loggers(%$metadata); |
68 | |
69 | return unless @loggers > 0; |
70 | #this is the point where the user provided log message |
71 | #code block is executed |
72 | my @content = $generator->(@$args); |
73 | foreach my $logger (@loggers) { |
74 | $self->_invoke_logger($logger, $level, \@content, $metadata); |
75 | } |
76 | } |
77 | |
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78 | sub handle_log_request { |
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79 | my ($self, $metadata_in, $generator, @args) = @_; |
80 | my %metadata = %{$metadata_in}; |
81 | my $level = $metadata{level}; |
82 | my $package = $metadata{package}; |
83 | my $need_clean = 0; |
84 | |
85 | #caller_level is useless when log forwarding is in place |
86 | #so we won't tempt people with using it for now - access |
87 | #to caller level will be available in the future |
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88 | my $caller_level = delete $metadata{caller_level}; |
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89 | $metadata{object_remote} = $self->_remote_metadata; |
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90 | $metadata{timestamp} = time; |
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91 | $metadata{pid} = $$; |
92 | $metadata{hostname} = hostname; |
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93 | |
94 | my @caller_info = caller($caller_level); |
95 | $metadata{filename} = $caller_info[1]; |
96 | $metadata{line} = $caller_info[2]; |
97 | |
98 | @caller_info = caller($caller_level + 1); |
99 | $metadata{method} = $caller_info[3]; |
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100 | $metadata{method} =~ s/^${package}::// if defined $metadata{method}; |
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101 | |
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102 | $self->_deliver_message($level, $generator, [ @args ], \%metadata); |
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103 | } |
104 | |
105 | sub connect { |
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106 | my ($self, $destination, $is_weak) = @_; |
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107 | my $wrapped; |
108 | |
109 | if (ref($destination) ne 'CODE') { |
110 | $wrapped = sub { $destination }; |
111 | } else { |
112 | $wrapped = $destination; |
113 | } |
114 | |
115 | push(@{$self->_connections}, $wrapped); |
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116 | weaken($self->_connections->[-1]) if $is_weak; |
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117 | } |
118 | |
119 | sub _clean_connections { |
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120 | my ($self) = @_; |
121 | @{$self->{_connections}} = grep { defined } @{$self->{_connections}}; |
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122 | } |
123 | |
124 | 1; |