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Currently if using a single line logger, this causes the time stamp and
log message to be on separate lines which is not common to how most
other logging works.
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The Logger by default includes a guard which checks for the
logging level. By removing the custom logging guards, we can decouple
the logging guard from the logging action to be done.
This also follows the good practice listed on http://guides.rubyonrails.org/debugging_rails_applications.html#impact-of-logs-on-performance.
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*TLDR*: The method is 4 times faster when log level is higher than DEBUG.
Also, the other two methods, `#deliver` and `#receive` have similar guard statements,
so this commit adds some symmetry to the code.
This is probably not the most critical part of ActionMailer in terms
of performance, but here are some benchmarks:
```
require 'benchmark/ips'
require 'action_mailer'
event = ActiveSupport::Notifications::Event.new(
'process.action_mailer',
Time.now,
Time.now,
'bf4e2b36ce085fd35b24',
{ mailer: "UserMailer", action: :welcome }
)
ActionMailer::Base.logger = ActiveSupport::Logger.new '/dev/null'
subscriber = ActionMailer::LogSubscriber.new
def subscriber.process_with_guard(event)
return unless logger.debug?
mailer = event.payload[:mailer]
action = event.payload[:action]
debug("\n#{mailer}##{action}: processed outbound mail in #{event.duration.round(1)}ms")
end
Benchmark.ips do |r|
ActionMailer::Base.logger.level = ::Logger::Severity::INFO
r.report('no guard') { subscriber.process(event) }
r.report(' guard') { subscriber.process_with_guard(event) }
end
__END__
Calculating -------------------------------------
no guard 9640 i/100ms
guard 38381 i/100ms
-------------------------------------------------
no guard 169166.9 (±10.2%) i/s - 838680 in 5.007262s
guard 728184.9 (±9.6%) i/s - 3607814 in 4.999218s
```
When log level is DEBUG, the _guarded_ method is a bit slower. This is a
good tradeoff for 4x improvement in production mode.
```
Benchmark.ips do |r|
ActionMailer::Base.logger.level = ::Logger::Severity::DEBUG
r.report('no guard') { subscriber.process(event) }
r.report(' guard') { subscriber.process_with_guard(event) }
end
__END__
Calculating -------------------------------------
no guard 4970 i/100ms
guard 4564 i/100ms
-------------------------------------------------
no guard 55617.4 (±3.5%) i/s - 278320 in 5.010523s
guard 49452.1 (±5.6%) i/s - 251020 in 5.093358s
```
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The processing of outbound mail is instrumented with the key
`process.action_mailer`. The payload includes the mailer name as well as
the mailer method.
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This reverts commit 328e876a1569058e47eaf7ea3f4f045a83b585fa.
Reason: Let's not nodoc without reason.
[ci skip]
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ActionMailer::DeliveryMethods::ClassMethods
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performing an operations.
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frameworks like ActiveRecord and ActiveResource to log outsude Rails::Application [#4816 state:resolved]
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