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Low Latency Logging 
with RabbitMQ 
BrnoPHP Conference 2014
Who is this guy? 
James Titcumb 
www.jamestitcumb.com 
www.protected.co.uk 
www.phphants.co.uk 
@asgrim
Let’s go back to basics...
Errors
source: http://www.dpaddbags.com/blog/episode-119-technology-sucks/
error_reporting(0);
They look rubbish!
@
Log to file only
Ways Around 
// Will raise E_WARNING 
fopen($somefile, 'r');
Ways Around 
// No error! :) 
if (file_exists($somefile)) { 
fopen($somefile, 'r'); 
} else { 
// nice handling... 
// maybe throw exception... 
}
Exceptions
Jargon Buster 
● throw 
Triggering 
● try 
Try to run 
● catch 
Handle it 
● finally 
Run code after try/catch
source: http://www.dpaddbags.com/blog/episode-119-technology-sucks/
C♯/C++
Catchable
Turn into fatal errors 
if not caught
Classy
Descriptive exceptions
Example (exception class) 
class DivisionByZeroException 
extends LogicException 
{ 
}
Example (throw) 
class Mathematics { 
public function divide($a, $b) { 
if ($b == 0) { 
$msg = sprintf(“Divide %s by zero”, $a); 
throw new DivisionByZeroException($msg); 
} 
return ($a / $b); 
} 
}
Example (catch) 
$maths = new Mathematics(); 
try 
{ 
$result = $maths->divide(5, 0); 
} 
catch (DivisionByZeroException $exception) 
{ 
$logger->warning($exception->getMessage()); 
}
Throw Descriptively
Logging
What is “logging”?
What is “logging”? 
Keeping a record of all events...
What is “logging”? 
Keeping a record of all events... 
exceptions, errors, warnings, info, debug
Paper Trail
Log like you just don’t care
Log like you just don’t care
Log wherever you like
What about Apache’s error_log? 
source: http://up-ship.com/blog/?p=20903
Doin’ it rightwrong… 
// Magic file that makes your entire project work perfectly 
@ini_set('display_errors', 0); 
@error_reporting(0); 
function __globalErrorHandler() { 
return true; 
} 
@set_error_handler('__globalErrorHandler'); 
@set_exception_handler('__globalErrorHandler'); 
@register_shutdown_function(function() { 
if(error_get_last()) 
echo "Script executed successfully!"; 
}); https://github.com/webarto/boostrap.php
Fire & Forget
Low Latency
Highly Available
PSR-3
Logging Options 
● monolog (PSR-3) 
● Drupal - PSR-3 Watchdog 
● phpconsole 
● log4php 
● RavenPHP + Sentry 
● FirePHP (dev environment) 
● Roll your own
source: http://mirror-sg-wv1.gallery.hd.org/_c/natural-science/cogs-with-meshed-teeth-AJHD.jpg.html
Capturing Messages
Capturing Messages 
set_error_handler()
Capturing Messages 
set_exception_handler()
Capturing Messages 
register_shutdown_function()
Capturing Messages 
Using the Logger Directly
Adapter / Handler
Typical PSR-3 Compatible Design 
Capture Method 
Logger (PSR-3) 
Handler / Adapter 
Data Storage
MonologErrorHandler 
->handleException() 
MonologLogger 
->log() 
MonologHandler 
->handle() 
Monolog
Low Latency Logging
Make it easy
Fire & Forget
Minimum Impact
Slow Logging 
Browser Application Log Server 
HTTP request 
Send log message to log server 
Error! 
Acknowledge message 
HTTP response to client
Zero Latency Logging (ideal) 
Browser Application Log Server 
HTTP request 
Send log message to log server 
Error! 
HTTP response to client
UDP?
We need a balance.
Low Latency Logging (balance) 
Browser Application Log Server 
HTTP request 
Send log message to log server 
Error! 
HTTP response to client
…so how?
Disclaimer...
Say hello to RabbitMQ
RabbitMQ - Basic 
test_queue 
1 2 3 4 5 
Producer Consumer 
source: http://www.rabbitmq.com/tutorials/tutorial-one-php.html
RabbitMQ - Exchanges 
Exchange 
Consumer test_queue 
1 2 3 4 5 
source: http://www.rabbitmq.com/tutorials/tutorial-three-php.html 
Consumer 
Producer 
Producer 
Producer
Exchanges are flexible
RabbitMQ === Fast!
Low Latency (using AMQP) 
EdLogHandlerErrorHandler 
->handleException() 
EdLogLogger 
->log() 
EdLogPublisherAmqpPublisher 
->publish() 
RabbitMQ JSON payload 
Logging Server
Low Latency Logging (with AMQP) 
Browser Application Log Server 
Fetch message 
HTTP request 
JSON via AMQP 
Error! 
HTTP response 
RabbitMQ
Why bother? 
● Scalability 
RabbitMQ 
Application A 
Application B 
Application C 
Log Worker 
Log Worker 
Log Worker 
Log Worker
Single Point of Failure... 
RabbitMQ 
Node 1 
RabbitMQ 
Node 3 
RabbitMQ 
Node 2 
RabbitMQ 
Node 4 
RabbitMQ 
Node 6 
RabbitMQ 
Node 5
To recap...
Scalable.
Easy.
Fast.
Future proof.
Questions?
Thanks for watching! 
James Titcumb 
@asgrim

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