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1 | package Object::Remote::Logging; |
2 | |
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3 | use Moo; |
4 | use Scalar::Util qw(blessed); |
5 | use Object::Remote::Logging::Logger; |
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6 | use Exporter::Declare; |
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7 | use Carp qw(carp croak); |
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8 | |
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9 | extends 'Log::Contextual'; |
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10 | |
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11 | exports(qw( ____ router arg_levels )); |
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12 | |
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13 | sub router { |
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14 | our $Router_Instance ||= do { |
15 | require Object::Remote::Logging::Router; |
16 | Object::Remote::Logging::Router->new; |
17 | } |
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18 | } |
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19 | |
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20 | #log level descriptions |
21 | #info - standard log level - normal program output for the end user |
22 | #warn - output for program that is executing quietly |
23 | #error - output for program that is running more quietly |
24 | #fatal - it is not possible to continue execution; this level is as quiet as is possible |
25 | #verbose - output for program executing verbosely (-v) |
26 | #debug - output for program running more verbosely (-v -v) |
27 | #trace - output for program running extremely verbosely (-v -v -v) |
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28 | sub arg_levels { |
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29 | #the order of the log levels is significant with the |
30 | #most verbose level being first in the list and the |
31 | #most quiet as the last item |
32 | return [qw( trace debug verbose info warn error fatal )]; |
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33 | } |
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34 | |
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35 | sub before_import { |
36 | my ($class, $importer, $spec) = @_; |
37 | my $router = $class->router; |
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38 | our $DID_INIT; |
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39 | |
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40 | unless($DID_INIT) { |
41 | $DID_INIT = 1; |
42 | init_logging(); |
43 | } |
44 | |
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45 | $class->SUPER::before_import($importer, $spec); |
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46 | } |
47 | |
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48 | sub _parse_selections { |
49 | my ($selections_string) = @_; |
50 | my %log_ok; |
51 | |
52 | #example string: |
53 | #" * -Object::Remote::Logging Foo::Bar::Baz " |
54 | foreach(split(/\s+/, $selections_string)) { |
55 | next if $_ eq ''; |
56 | if ($_ eq '*') { |
57 | $log_ok{$_} = 1; |
58 | } elsif (s/^-//) { |
59 | $log_ok{$_} = 0; |
60 | } else { |
61 | $log_ok{$_} = 1; |
62 | } |
63 | } |
64 | |
65 | return %log_ok; |
66 | } |
67 | |
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68 | #this is invoked on all nodes |
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69 | sub init_logging { |
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70 | my $level = $ENV{OBJECT_REMOTE_LOG_LEVEL}; |
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71 | my $format = $ENV{OBJECT_REMOTE_LOG_FORMAT}; |
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72 | my $selections = $ENV{OBJECT_REMOTE_LOG_SELECTIONS}; |
73 | my %controller_should_log; |
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74 | |
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75 | return unless defined $level; |
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76 | $format = "[%l %r] %s" unless defined $format; |
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77 | $selections = __PACKAGE__ unless defined $selections; |
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78 | %controller_should_log = _parse_selections($selections); |
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79 | |
80 | { |
81 | no warnings 'once'; |
82 | if (defined $Object::Remote::FatNode::REMOTE_NODE) { |
83 | #the connection id for the remote node comes in later |
84 | #as the controlling node inits remote logging |
85 | router()->_remote_metadata({ connection_id => undef }); |
86 | } |
87 | } |
88 | |
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89 | my $logger = Object::Remote::Logging::Logger->new( |
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90 | min_level => lc($level), format => $format, |
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91 | level_names => Object::Remote::Logging::arg_levels(), |
92 | ); |
93 | |
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94 | router()->connect(sub { |
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95 | my $controller = $_[1]->{controller}; |
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96 | my $will_log = $controller_should_log{$controller}; |
97 | |
98 | $will_log = $controller_should_log{'*'} unless defined $will_log; |
99 | |
100 | return unless $will_log; |
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101 | #skip things from remote hosts because they log to STDERR |
102 | #when OBJECT_REMOTE_LOG_LEVEL is in effect |
103 | return if $_[1]->{remote}->{connection_id}; |
104 | $logger |
105 | }); |
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106 | } |
107 | |
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108 | #this is invoked by the controlling node |
109 | #on the remote nodes |
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110 | sub init_remote_logging { |
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111 | my ($self, %controller_info) = @_; |
112 | |
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113 | router()->_remote_metadata(\%controller_info); |
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114 | #TODO having an instance of an object in the remote interpreter causes it to hang |
115 | #on exit intermitently or leave a zombie laying around frequently - not a bug limited |
116 | #to log forwarding |
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117 | router()->_forward_destination($controller_info{router}) if $ENV{OBJECT_REMOTE_LOG_FORWARDING}; |
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118 | } |
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119 | |
120 | 1; |
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121 | |
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122 | __END__ |
123 | |
124 | =head1 NAME |
125 | |
126 | Object::Remote::Logging - Logging subsystem for Object::Remote |
127 | |
128 | =head1 SYNOPSIS |
129 | |
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130 | use Object::Remote::Logging qw( :log :dlog arg_levels router ); |
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131 | |
132 | @levels = qw( trace debug verbose info warn error fatal ); |
133 | @levels = arg_levels(); #same result |
134 | |
135 | $ENV{OBJECT_REMOTE_LOG_LEVEL} = 'trace'; #or other level name |
136 | $ENV{OBJECT_REMOTE_LOG_FORMAT} = '%l %t: %p::%m %s'; #and more |
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137 | $ENV{OBJECT_REMOTE_LOG_SELECTIONS} = 'Object::Remote::Logging Some::Other::Subclass'; |
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138 | $ENV{OBJECT_REMOTE_LOG_SELECTIONS} = '* -Object::Remote::Logging'; |
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139 | $ENV{OBJECT_REMOTE_LOG_FORWARDING} = 0 || 1; #default 0 |
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140 | |
141 | log_info { 'Trace log event' }; |
142 | Dlog_verbose { "Debug event with Data::Dumper::Concise: $_" } { foo => 'bar' }; |
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143 | |
144 | =head1 DESCRIPTION |
145 | |
146 | This is the logging framework for Object::Remote implemented as a subclass of |
147 | L<Log::Contextual> with a slightly incompatible API. This system allows |
148 | developers using Object::Remote and end users of that software to control |
149 | Object::Remote logging so operation can be tracked if needed. This is also |
150 | the API used to generate log messages inside the Object::Remote source code. |
151 | |
152 | The rest of the logging system comes from L<Object::Remote::Logging::Logger> |
153 | which implements log rendering and output and L<Object::Remote::Logging::Router> |
154 | which delivers log events to the loggers. |
155 | |
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156 | =head1 USAGE |
157 | |
158 | Object::Remote logging is not enabled by default. If you need to immediately start |
159 | debugging set the OBJECT_REMOTE_LOG_LEVEL environment variable to either 'trace' |
160 | or 'debug'. This will enable logging to STDERR on the local and all remote Perl |
161 | interpreters. By default STDERR for all remote interpreters is passed through |
162 | unmodified so this is sufficient to receive logs generated anywhere Object::Remote |
163 | is running. |
164 | |
165 | Every time the local interpreter creates a new Object::Remote::Connection the connection |
166 | is given an id that is unique to that connection on the local interpreter. The connection |
167 | id and other metadata is available in the log output via a log format string that can |
168 | be set via the OBJECT_REMOTE_LOG_FORMAT environment variable. The format string and |
169 | available metadata is documented in L<Object::Remote::Logging::Logger>. Setting this |
170 | environment variable on the local interpreter will cause it to be propagated to the |
171 | remote interpreter so all logs will be formated the same way. |
172 | |
173 | This class is designed so any module can create their own logging sub-class using it. |
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174 | With out any additional configuration the consumers of this logging class will |
175 | automatically be enabled via OBJECT_REMOTE_LOG_LEVEL and formated with |
176 | OBJECT_REMOTE_LOG_FORMAT but those additional log messages are not sent to STDERR. |
177 | By setting the OBJECT_REMOTE_LOG_SELECTIONS environment variable to a list of |
178 | class names seperated by spaces then logs generated by packages that use those classes |
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179 | will be sent to STDERR. If the asterisk character (*) is used in the place of a class |
180 | name then all class names will be selected by default instead of ignored. An individual |
181 | class name can be turned off by prefixing the name with a hypen character (-). This is |
182 | also a configuration item that is forwarded to the remote interpreters so all logging |
183 | is consistent. |
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184 | |
185 | Regardless of OBJECT_REMOTE_LOG_LEVEL the logging system is still active and loggers |
186 | can access the stream of log messages to format and output them. Internally |
187 | OBJECT_REMOTE_LOG_LEVEL causes an L<Object::Remote::Logging::Logger> to be built |
188 | and connected to the L<Object::Remote::Logging::Router> instance. It is also possible |
189 | to manually build a logger instance and connect it to the router. See the documentation |
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190 | for the logger and router classes. |
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191 | |
192 | The logging system also supports a method of forwarding log messages from remote |
193 | interpreters to the local interpreter. Forwarded log messages are generated in the |
194 | remote interpreter and the logger for the message is invoked in the local interpreter. |
195 | Sub-classes of Object::Remote::Logging will have log messages forwarded automatically. |
196 | Loggers receive forwarded log messages exactly the same way as non-forwarded messages |
197 | except a forwarded message includes extra metadata about the remote interpreter. Log |
198 | forwarding is not currently enabled by default; to enable it set the |
199 | OBJECT_REMOTE_LOG_FORWARDING environment variable to 1. See L<Object::Remote::Logging::Router>. |
200 | |
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201 | =head1 EXPORTABLE SUBROUTINES |
202 | |
203 | =over 4 |
204 | |
205 | =item arg_levels |
206 | |
207 | Returns an array reference that contains the ordered list of level names |
208 | with the lowest log level first and the highest log level last. |
209 | |
210 | =item router |
211 | |
212 | Returns the instance of L<Object::Remote::Logging::Router> that is in use. The router |
213 | instance is used in combination with L<Object::Remote::Logging::Logger> objects to |
214 | select then render and output log messages. |
215 | |
216 | =item log_<level> and Dlog_<level> |
217 | |
218 | These methods come direct from L<Log::Contextual>; see that documentation for a |
219 | complete reference. For each of the log level names there are subroutines with the log_ |
220 | and Dlog_ prefix that will generate the log message. The first argument is a code block |
221 | that returns the log message contents and the optional further arguments are both passed |
222 | to the block as the argument list and returned from the log method as a list. |
223 | |
224 | log_trace { "A fine log message $_[0] " } 'if I do say so myself'; |
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225 | %hash = Dlog_trace { "Very handy: $_" } ( foo => 'bar' ); |
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226 | |
227 | =item logS_<level> and DlogS_<level> |
228 | |
229 | Works just like log_ and Dlog_ except returns only the first argument as a scalar value. |
230 | |
231 | my $beverage = log_info { "Customer ordered $_[0]" } 'Coffee'; |
232 | |
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233 | =back |
234 | |
235 | =head1 LEVEL NAMES |
236 | |
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237 | Object::Remote uses an ordered list of log level names with the lowest level |
238 | first and the highest level last. The list of level names can be accessed via |
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239 | the arg_levels method which is exportable to the consumer of this class. The log |
240 | level names are: |
241 | |
242 | =over 4 |
243 | |
244 | =item trace |
245 | |
246 | As much information about operation as possible including multiple line dumps of |
247 | large content. Tripple verbose operation (-v -v -v). |
248 | |
249 | =item debug |
250 | |
251 | Messages about operations that could hang as well as internal state changes, |
252 | results from method invocations, and information useful when looking for faults. |
253 | Double verbose operation (-v -v). |
254 | |
255 | =item verbose |
256 | |
257 | Additional optional messages to the user that can be enabled at their will. Single |
258 | verbose operation (-v). |
259 | |
260 | =item info |
261 | |
262 | Messages from normal operation that are intended to be displayed to the end |
263 | user if quiet operation is not indicated and more verbose operation is not |
264 | in effect. |
265 | |
266 | =item warn |
267 | |
268 | Something wasn't supposed to happen but did. Operation was not impacted but |
269 | otherwise the event is noteworthy. Single quiet operation (-q). |
270 | |
271 | =item error |
272 | |
273 | Something went wrong. Operation of the system may continue but some operation |
274 | has most definitely failed. Double quiet operation (-q -q). |
275 | |
276 | =item fatal |
277 | |
278 | Something went wrong and recovery is not possible. The system should stop operating |
279 | as soon as possible. Tripple quiet operation (-q -q -q). |
280 | |
281 | =back |