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Low Latency Logging
at BrightonPHP
James Titcumb

@asgrim
github.com/asgrim
● Started on Amiga 500
● PHP for 11 years
● ZCE PHP 5.3
●
●
●
●
●

Run PHP Hampshire user group
Lead dev on browscap.ini
First open source GoDeploy
Development Manager at Protected.co.uk
Mostly a ZF2 developer

@asgrim
github.com/asgrim
Hello! :)

@asgrim
github.com/asgrim
Errors
What are errors?
● Something broke… :)
● e.g.
○ Can’t connect to MySQL (mysqli_connect)
○ No such file or directory (fopen)

● Usually PHP core
● Sometimes “fatal”
Problems?

source: http://www.dpaddbags.com/blog/episode-119-technology-sucks/
Problems.
●
●
●
●
●

error_reporting setting
Errors look ugly
“@”
Limited options
Not very “OO”
Ways Around
// Will raise E_NOTICE
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
What are exceptions?
●
●
●
●
●

Something still broke
OO
Catchable
Fatal errors
They are classes
SPL Exceptions
● Built in to PHP
● More descriptive than just “Exception”, e.g.:
○
○
○
○
○

InvalidArgumentException
LogicException
OutOfBoundsException
RuntimeException
see PHP manual for more
Example (exception class)
class DivisionByZeroException
extends LogicException
{
}
Example (throw)
class Mathematics
{
public function divide($a, $b)
{
if ($b == 0) {
$msg = sprintf(‘Tried to 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());
}
Logging
What is “logging”?
Keeping a record of all events...
exceptions, errors, warnings, info, debug
Why use logging?
●
●
●
●

Easier to find problems
More detail
“paper trail” for code
Log where you want
What about Apache’s error_log?

source: http://up-ship.com/blog/?p=20903
Why?
● error_log is too basic
● Reading / parsing
● error_reporting (again)
Doin’ it right wrong…
/************************************************************
*

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
Requirements (for everyone)
●
●
●
●

Fire & forget
Minimum or zero latency
Highly available
Log everything:
○
○
○
○

Exceptions
Errors
Fatal Errors
Debug & info

● PSR-3 compatible
PSR-3
● Common logging interface
→ LoggerInterface
● RFC-5424 Levels
(debug, info, notice, warning, error, critical, alert, emergency)

● Interoperability
● Reusability
Logging Options
●
●
●
●
●
●
●

monolog (PSR-3)
Drupal - PSR-3 Watchdog
phpconsole
log4php
RavenPHP + Sentry
FirePHP (dev environment)
Roll your own
How they work...

source: http://mirror-sg-wv1.gallery.hd.org/_c/natural-science/cogs-with-meshed-teeth-AJHD.jpg.html
Capturing Logging
Use “capture methods”, send to $logger
● set_exception_handler()
○ Handles all uncaught exceptions

● set_error_handler()
○ Handles most errors

● register_shutdown_function()
○ Handles fatal errors
Sending Log Messages
● Handler/Adapter translates
● However you want…
● Monolog has loads:
○
○
○
○

syslog-compatible / error_log
Email, HipChat
AMQP, Sentry, Zend Monitor, Graylog2
Redis, MongoDB, CouchDB
Typical PSR-3 Compatible Design
Capture Method

Logger (PSR-3)

Handler / Adapter

Data Storage
Monolog
MonologErrorHandler
->handleException()

MonologLogger
->log()

MonologHandler
->handle()
Low Latency
High Performance
What do I mean?
● Easy to add
● Fire & Forget
● Minimum impact to request
Slow Logging
Browser

Application

Log Server

HTTP request

Error!

Send log message to database

Acknowledge message
HTTP response to client
Zero Latency Logging (ideal)
Browser

Application

Log Server

HTTP request

Error!

HTTP response to client

Send log message to database
What about UDP?
● Yes… Zero latency, but….
● Do you even care about your logs?
(UDP means log messages may get lost...)
● TCP means guaranteed network delivery
● Any non-blocking fails
Low Latency Logging (balance)
Browser

Application

Log Server

HTTP request

Error!

HTTP response to client

Send log message to database
So how?
Say hello to RabbitMQ
What is RabbitMQ?
●
●
●
●

Robust messaging for applications
Easy to use
Runs on all major operating systems
Supports a huge number of developer
platforms
● Open source and commercially supported
www.rabbitmq.com
RabbitMQ - Basic

queue
“Consumer”

“Publisher”

source: http://www.rabbitmq.com/tutorials/tutorial-one-php.html
RabbitMQ - Exchanges
“Publisher”

“Publisher”

queue 1
“Consumer 1”

“Publisher”

“Exchange”

queue 2
“Consumer 2”

“Publisher”
“Publisher”

source: http://www.rabbitmq.com/tutorials/tutorial-three-php.html
Using Queues === Fast!
Add RabbitMQ to logging architecture...
Low Latency (using AMQP)
EdLogHandlerErrorHandler
->handleException()

EdLogLogger
->log()

EdLogPublisherAmqpPublisher
->publish()

RabbitMQ

Logging Server

JSON payload
Low Latency Logging (with AMQP)
Browser

Application

RabbitMQ

Log Server

HTTP request

Error!

JSON via AMQP
HTTP response

Fetch message
Why bother?
● Scalability
Log Worker
Application A

Log Worker
Application B

RabbitMQ
Log Worker

Application C
Log Worker
Single Point of Failure...
● RabbitMQ can do HA
RabbitMQ
Node 6
RabbitMQ
Node 1

RabbitMQ
Node 2
RabbitMQ
Node 5

RabbitMQ
Node 3
RabbitMQ
Node 4
Live demo
(pre-recorded… meh)
Questions?
Feedback please...
https://joind.in/9928
Thanks!
https://joind.in/9928

@asgrim
github.com/asgrim

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