README

haphproxy is a PHP library which can parse and create HAproxy configuration files.

The library operates on the configuration at a low level. A configuration is made up of sections (e.g. global and default). Each section is made up of parameters (e.g. mode and timeout). Each parameter has a value associated with it, e.g. a parameter named timeout can have a value of timeout 30s.

Since the library doesn't actually understand how HAproxy works, it is only guaranteed to generate syntactically valid configurations. For proper validation, please use haproxy -f <configurationFile> -c.

Requirements

• PHP 5.6 or newer

Installation

Install via Composer:

composer require jalle19/haphproxy

Usage

Reading a configuration

This example reads an existing configuration file, parses it and dumps it back as a string:

// Create a parser
try {
	$parser = new Parser('/etc/haproxy/haproxy.cfg');
} catch (FileNotFoundException $e) {
	die($e->getMessage());
}

// Parse and dump the configuration
$configuration = $parser->parse();
$writer = new Writer($configuration);

echo $writer->dump();

Writing a configuration

This example shows how you can dynamically create a configuration:

$configuration = new Configuration();

// Add a global section
$globalSection = new Section\GlobalSection();
$globalSection->addParameter(new Parameter('daemon'))
              ->addParameter(new Parameter('maxconns', 128));
$configuration->addSection($globalSection);

// Add a defaults section
$defaultsSection = new Section\DefaultsSection();
$defaultsSection->addParameter(new Parameter('mode', 'http'));
$configuration->addSection($defaultsSection);

// Dump the configuration
$writer = new Writer($configuration);

echo $writer->dump();

The above results in the following configuration being generated:

# Generated with Jalle19\haphproxy
global
    daemon
    maxconns 128

defaults
    mode http

Changing the output formatting

You can change the indentation and preface of the generated configuration. Changing the preface may be useful when used in combination with other tools to indicate whether the configuration file has been generated dynamically or not.

$configuration = new Configuration();
$writer = new Writer($configuration);

// Remember to include the comment character in the preface
$writer->setPreface('# AUTOGENERATED, DO NOT EDIT MANUALLY');
$writer->setIndent('  ');

echo $writer->dump();

Inspecting a configuration

You can access the individual parameters of each section like this:

// Make a section with some parameters
$section = new Section\DefaultsSection();
$section->addParameter(new Parameter('mode', 'http'));
$section->addParameter(new Parameter('timeout', 'client 30s'));
$section->addParameter(new Parameter('timeout', 'connect 30s'));
$section->addParameter(new Parameter('timeout', 'server 30s'));

// Get the value of a single parameter
$modeParameter = $section->getParameter('mode');
$mode = $modeParameter->getValue();

// Loop through all the "timeout" parameters
foreach ($section->getParametersByName('timeout') as $timeoutParameter) {

}

You can also loop through specific sections of a configuration:

$configuration = new Configuration();
$configuration->addSection(new FrontendSection('frontend frontend-1'));
$configuration->addSection(new FrontendSection('frontend frontend-2'));
$configuration->addSection(new FrontendSection('frontend frontend-3'));

foreach ($configuration->getFrontendSections() as $frontendSection) {

}

Magic comments

A magic comment is a comment that beings with HAPHPROXY_COMMENT. In contrast to normal comments, these are not omitted during parsing and writing. Magic comments only apply to sections and can be useful to store arbitrary data.

$configuration = new Configuration();

$section = new Section\DefaultsSection();
$section->addMagicComment('magic');
$section->addParameter(new Parameter('mode', 'http'));

$writer = new Writer($configuration);

echo $writer->dump();

The above results in the following configuration being generated:

# Generated with Jalle19\haphproxy
defaults
    # HAPHPROXY_COMMENT magic
    mode http

Testing

The test suite leaves all the validation of the generated configurations to HAproxy itself, so in order to run the test suite you'll need to have haproxy in your path. To run the test suite, run php vendor/bin/phpunit.

There is a Vagrantfile shipped with the library which automatically provisions itself with all the required software.

License

This library is licensed under the GNU General Public License 2 or newer