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