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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 $DID_INIT; |
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39 | |
c2a69537 |
40 | unless($DID_INIT) { |
41 | $DID_INIT = 1; |
42 | init_logging(); |
43 | } |
44 | |
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45 | $class->SUPER::before_import($importer, $spec); |
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46 | } |
47 | |
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48 | sub _parse_selections { |
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49 | my ($selections_string) = @_; |
50 | my %log_ok; |
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51 | |
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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; |
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62 | } |
8f43bcd9 |
63 | } |
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64 | |
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65 | return %log_ok; |
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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}; |
0fe333eb |
71 | my $format = $ENV{OBJECT_REMOTE_LOG_FORMAT}; |
eb49c7df |
72 | my $selections = $ENV{OBJECT_REMOTE_LOG_SELECTIONS}; |
abef6e5b |
73 | my $test_logging = $ENV{OBJECT_REMOTE_TEST_LOGGER}; |
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74 | my %controller_should_log; |
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75 | |
76 | unless (defined $ENV{OBJECT_REMOTE_LOG_FORWARDING} && $ENV{OBJECT_REMOTE_LOG_FORWARDING} ne '') { |
77 | $ENV{OBJECT_REMOTE_LOG_FORWARDING} = 1; |
78 | } |
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79 | |
80 | if ($test_logging) { |
81 | require Object::Remote::Logging::TestLogger; |
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82 | router->connect(Object::Remote::Logging::TestLogger->new( |
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83 | min_level => 'trace', max_level => 'error', |
84 | level_names => Object::Remote::Logging->arg_levels(), |
85 | )); |
86 | } |
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87 | |
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88 | { |
89 | no warnings 'once'; |
90 | if (defined $Object::Remote::FatNode::REMOTE_NODE) { |
91 | #the connection id for the remote node comes in later |
92 | #as the controlling node inits remote logging |
93 | router()->_remote_metadata({ connection_id => undef }); |
94 | } |
95 | } |
96 | |
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97 | return unless defined $level && $level ne ''; |
98 | |
99 | $format = "[%l %r] %s" unless defined $format; |
100 | $selections = __PACKAGE__ unless defined $selections; |
101 | %controller_should_log = _parse_selections($selections); |
102 | |
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103 | my $logger = Object::Remote::Logging::Logger->new( |
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104 | min_level => lc($level), format => $format, |
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105 | level_names => Object::Remote::Logging::arg_levels(), |
106 | ); |
107 | |
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108 | router()->connect(sub { |
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109 | my $controller = $_[1]->{controller}; |
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110 | my $will_log = $controller_should_log{$controller}; |
111 | |
112 | $will_log = $controller_should_log{'*'} unless defined $will_log; |
113 | |
114 | return unless $will_log; |
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115 | #skip things from remote hosts because they log to STDERR |
116 | #when OBJECT_REMOTE_LOG_LEVEL is in effect |
117 | return if $_[1]->{remote}->{connection_id}; |
118 | $logger |
119 | }); |
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120 | } |
121 | |
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122 | #this is invoked by the controlling node |
123 | #on the remote nodes |
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124 | sub init_remote_logging { |
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125 | my ($self, %controller_info) = @_; |
126 | |
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127 | router()->_remote_metadata(\%controller_info); |
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128 | router()->_forward_destination($controller_info{router}) if $ENV{OBJECT_REMOTE_LOG_FORWARDING}; |
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129 | } |
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130 | |
131 | 1; |
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132 | |
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133 | __END__ |
134 | |
135 | =head1 NAME |
136 | |
137 | Object::Remote::Logging - Logging subsystem for Object::Remote |
138 | |
139 | =head1 SYNOPSIS |
140 | |
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141 | use Object::Remote::Logging qw( :log :dlog arg_levels router ); |
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142 | |
143 | @levels = qw( trace debug verbose info warn error fatal ); |
144 | @levels = arg_levels(); #same result |
145 | |
146 | $ENV{OBJECT_REMOTE_LOG_LEVEL} = 'trace'; #or other level name |
147 | $ENV{OBJECT_REMOTE_LOG_FORMAT} = '%l %t: %p::%m %s'; #and more |
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148 | $ENV{OBJECT_REMOTE_LOG_SELECTIONS} = 'Object::Remote::Logging Some::Other::Subclass'; |
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149 | $ENV{OBJECT_REMOTE_LOG_SELECTIONS} = '* -Object::Remote::Logging'; |
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150 | $ENV{OBJECT_REMOTE_LOG_FORWARDING} = 0; #default 1 |
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151 | |
152 | log_info { 'Trace log event' }; |
153 | Dlog_verbose { "Debug event with Data::Dumper::Concise: $_" } { foo => 'bar' }; |
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154 | |
155 | =head1 DESCRIPTION |
156 | |
157 | This is the logging framework for Object::Remote implemented as a subclass of |
158 | L<Log::Contextual> with a slightly incompatible API. This system allows |
159 | developers using Object::Remote and end users of that software to control |
160 | Object::Remote logging so operation can be tracked if needed. This is also |
161 | the API used to generate log messages inside the Object::Remote source code. |
162 | |
163 | The rest of the logging system comes from L<Object::Remote::Logging::Logger> |
164 | which implements log rendering and output and L<Object::Remote::Logging::Router> |
165 | which delivers log events to the loggers. |
166 | |
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167 | =head1 USAGE |
168 | |
169 | Object::Remote logging is not enabled by default. If you need to immediately start |
170 | debugging set the OBJECT_REMOTE_LOG_LEVEL environment variable to either 'trace' |
171 | or 'debug'. This will enable logging to STDERR on the local and all remote Perl |
172 | interpreters. By default STDERR for all remote interpreters is passed through |
173 | unmodified so this is sufficient to receive logs generated anywhere Object::Remote |
174 | is running. |
175 | |
176 | Every time the local interpreter creates a new Object::Remote::Connection the connection |
177 | is given an id that is unique to that connection on the local interpreter. The connection |
178 | id and other metadata is available in the log output via a log format string that can |
179 | be set via the OBJECT_REMOTE_LOG_FORMAT environment variable. The format string and |
180 | available metadata is documented in L<Object::Remote::Logging::Logger>. Setting this |
181 | environment variable on the local interpreter will cause it to be propagated to the |
182 | remote interpreter so all logs will be formated the same way. |
183 | |
184 | This class is designed so any module can create their own logging sub-class using it. |
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185 | With out any additional configuration the consumers of this logging class will |
186 | automatically be enabled via OBJECT_REMOTE_LOG_LEVEL and formated with |
187 | OBJECT_REMOTE_LOG_FORMAT but those additional log messages are not sent to STDERR. |
188 | By setting the OBJECT_REMOTE_LOG_SELECTIONS environment variable to a list of |
189 | class names seperated by spaces then logs generated by packages that use those classes |
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190 | will be sent to STDERR. If the asterisk character (*) is used in the place of a class |
191 | name then all class names will be selected by default instead of ignored. An individual |
192 | class name can be turned off by prefixing the name with a hypen character (-). This is |
193 | also a configuration item that is forwarded to the remote interpreters so all logging |
194 | is consistent. |
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195 | |
196 | Regardless of OBJECT_REMOTE_LOG_LEVEL the logging system is still active and loggers |
197 | can access the stream of log messages to format and output them. Internally |
198 | OBJECT_REMOTE_LOG_LEVEL causes an L<Object::Remote::Logging::Logger> to be built |
199 | and connected to the L<Object::Remote::Logging::Router> instance. It is also possible |
200 | to manually build a logger instance and connect it to the router. See the documentation |
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201 | for the logger and router classes. |
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202 | |
203 | The logging system also supports a method of forwarding log messages from remote |
204 | interpreters to the local interpreter. Forwarded log messages are generated in the |
205 | remote interpreter and the logger for the message is invoked in the local interpreter. |
206 | Sub-classes of Object::Remote::Logging will have log messages forwarded automatically. |
207 | Loggers receive forwarded log messages exactly the same way as non-forwarded messages |
208 | except a forwarded message includes extra metadata about the remote interpreter. Log |
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209 | forwarding is enabled by default but comes with a performance hit; to disable it set the |
210 | OBJECT_REMOTE_LOG_FORWARDING environment variable to 0. See L<Object::Remote::Logging::Router>. |
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211 | |
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212 | =head1 EXPORTABLE SUBROUTINES |
213 | |
214 | =over 4 |
215 | |
216 | =item arg_levels |
217 | |
218 | Returns an array reference that contains the ordered list of level names |
219 | with the lowest log level first and the highest log level last. |
220 | |
221 | =item router |
222 | |
223 | Returns the instance of L<Object::Remote::Logging::Router> that is in use. The router |
224 | instance is used in combination with L<Object::Remote::Logging::Logger> objects to |
225 | select then render and output log messages. |
226 | |
227 | =item log_<level> and Dlog_<level> |
228 | |
229 | These methods come direct from L<Log::Contextual>; see that documentation for a |
230 | complete reference. For each of the log level names there are subroutines with the log_ |
231 | and Dlog_ prefix that will generate the log message. The first argument is a code block |
232 | that returns the log message contents and the optional further arguments are both passed |
233 | to the block as the argument list and returned from the log method as a list. |
234 | |
235 | log_trace { "A fine log message $_[0] " } 'if I do say so myself'; |
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236 | %hash = Dlog_trace { "Very handy: $_" } ( foo => 'bar' ); |
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237 | |
238 | =item logS_<level> and DlogS_<level> |
239 | |
240 | Works just like log_ and Dlog_ except returns only the first argument as a scalar value. |
241 | |
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242 | my $beverage = logS_info { "Customer ordered $_[0]" } 'Coffee'; |
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243 | |
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244 | =back |
245 | |
246 | =head1 LEVEL NAMES |
247 | |
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248 | Object::Remote uses an ordered list of log level names with the lowest level |
249 | first and the highest level last. The list of level names can be accessed via |
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250 | the arg_levels method which is exportable to the consumer of this class. The log |
251 | level names are: |
252 | |
253 | =over 4 |
254 | |
255 | =item trace |
256 | |
257 | As much information about operation as possible including multiple line dumps of |
258 | large content. Tripple verbose operation (-v -v -v). |
259 | |
260 | =item debug |
261 | |
262 | Messages about operations that could hang as well as internal state changes, |
263 | results from method invocations, and information useful when looking for faults. |
264 | Double verbose operation (-v -v). |
265 | |
266 | =item verbose |
267 | |
268 | Additional optional messages to the user that can be enabled at their will. Single |
269 | verbose operation (-v). |
270 | |
271 | =item info |
272 | |
273 | Messages from normal operation that are intended to be displayed to the end |
274 | user if quiet operation is not indicated and more verbose operation is not |
275 | in effect. |
276 | |
277 | =item warn |
278 | |
279 | Something wasn't supposed to happen but did. Operation was not impacted but |
280 | otherwise the event is noteworthy. Single quiet operation (-q). |
281 | |
282 | =item error |
283 | |
284 | Something went wrong. Operation of the system may continue but some operation |
285 | has most definitely failed. Double quiet operation (-q -q). |
286 | |
287 | =item fatal |
288 | |
289 | Something went wrong and recovery is not possible. The system should stop operating |
290 | as soon as possible. Tripple quiet operation (-q -q -q). |
291 | |
292 | =back |