Keboola PHP Component

General library for php component running in KBC. The library provides function related to Docker Runner.

Installation

composer install keboola/php-component

Usage

Create a subclass of BaseComponent.

<?php declare(strict_types = 1);

namespace MyComponent;

use Keboola\Component\BaseComponent;

class Component extends BaseComponent
{
    public function run(): void
    {
        // get parameters
        $parameters = $this->getConfig()->getParameters();

        // get value of customKey.customSubkey parameter and fail if missing
        $customParameter = $this->getConfig()->getValue(['parameters', 'customKey', 'customSubkey']);

        // get value with default value if not present
        $customParameterOrNull = $this->getConfig()->getValue(['parameters', 'customKey'], 'someDefaultValue');

        // get manifest for input file
        $fileManifest = $this->getManifestManager()->getFileManifest('input-file.csv');

        // get manifest for input table
        $tableManifest = $this->getManifestManager()->getTableManifest('in.tableName');

        // write manifest for output file
        $this->getManifestManager()->writeFileManifest('out-file.csv', ['tag1', 'tag2']);

        // write manifest for output table
        $this->getManifestManager()->writeTableManifest('data.csv', 'out.report', ['id']);
    }
}

Use this src/run.php template.

<?php declare(strict_types = 1);

require __DIR__ . '/../vendor/autoload.php';

try {
    $app = new MyComponent\Component();
    $app->run();
    exit(0);
} catch (\Keboola\Component\UserException $e) {
    echo $e->getMessage();
    exit(1);
} catch (\Throwable $e) {
    echo get_class($e) . ':' . $e->getMessage();
    echo "\nFile: " . $e->getFile();
    echo "\nLine: " . $e->getLine();
    echo "\nCode: " . $e->getCode();
    echo "\nTrace: " . $e->getTraceAsString() . "\n";
    exit(2);
}

Customizing config

Custom getters in config

You might want to add getter methods for custom parameters in the config. That way you don't need to remember exact keys (parameters.errorCount.maximumAllowed), but instead use a method to retrieve the value ($config->getMaximumAllowedErrorCount()).

Simply create your own Config class, that extends BaseConfig and override \Keboola\Component\BaseComponent::getConfigClass() method to return your new class name.

class MyConfig extends \Keboola\Component\Config\BaseConfig 
{
    public function getMaximumAllowedErrorCount()
    {
        $defaultValue = 0;
        return $this->getValue(['parameters', 'errorCount', 'maximumAllowed'], $defaultValue);
    }
}

and

class MyComponent extends \Keboola\Component\BaseComponent
{
    protected function getConfigClass(): string
    {
        return MyConfig::class;
    }
}

Custom parameters validation

To validate input parameters extend \Keboola\Component\Config\BaseConfigDefinition class. By overriding the getParametersDefinition() method, you can validate the parameters part of the config. Make sure that you return the actual node you add, not TreeBuilder. You can use parent::getParametersDefinition() to get the default node or you can build it yourself.

If you need to validate other parts of config as well, you can override getRootDefinition() method. Again, make sure that you return the actual node, not the TreeBuilder.

class MyConfigDefinition extends \Keboola\Component\Config\BaseConfigDefinition
{
    protected function getParametersDefinition()
    {
        $parametersNode = parent::getParametersDefinition();
        $parametersNode
            ->isRequired()
            ->children()
                ->arrayNode('errorCount')
                    ->isRequired()
                    ->children()
                        ->integerNode('maximumAllowed')
                            ->isRequired();
        return $parametersNode;
    }
}

Again you need to supply the new class name in your component

class MyComponent extends \Keboola\Component\BaseComponent
{
    protected function getConfigDefinitionClass(): string
    {
        return MyConfigDefinition::class;
    }
}

If any constraint of config definition is not met a UserException is thrown. That means you don't need to handle the messages yourself.

More reading

For more information, please refer to the generated docs. See development guide for help with KBC integration.