Elastic APM: PHP Agent

This is a PHP agent for Elastic.co's APM product: https://www.elastic.co/solutions/apm. Laravel & Lumen package https://github.com/philkra/elastic-apm-laravel

Please note that currently only the v1 intake API of the APM server is supported, v2 is in planing.

Installation

The recommended way to install the agent is through Composer.

Run the following composer command

php composer.phar require philkra/elastic-apm-php-agent

After installing, you need to require Composer's autoloader:

require 'vendor/autoload.php';

Usage

Initialize the Agent with minimal Config

$agent = new \PhilKra\Agent( [ 'appName' => 'demo' ] );

When creating the agent, you can directly inject shared contexts such as user, tags and custom.

$agent = new \PhilKra\Agent( [ 'appName' => 'with-custom-context' ], [
  'user' => [
    'id'    => 12345,
    'email' => 'email@acme.com',
  ],
  'tags' => [
    // ... more key-values
  ],
  'custom' => [
    // ... more key-values
  ]
] );

Capture Errors and Exceptions

The agent can capture all types or errors and exceptions that are implemented from the interface Throwable (http://php.net/manual/en/class.throwable.php).

$agent->captureThrowable( new Exception() );

Adding spans

Addings spans (https://www.elastic.co/guide/en/apm/server/current/transactions.html#transaction-spans) is easy. Please consult the documentation for your exact needs. Below is an example for adding a MySQL span.

$trxName = 'GET /some/transaction/name';

// create the agent
$agent = new \PhilKra\Agent(['appName' => 'Demo with Spans']);

// start a new transaction
$transaction = $agent->startTransaction($trxName);

// create a span
$spans = [];
$spans[] = [
  'name' => 'Your Span Name. eg: ORM Query',
  'type' => 'db.mysql.query',
  'start' => 300, // when did tht query start, relative to the transaction start, in milliseconds
  'duration' => 23, // duration, in milliseconds
  'stacktrace' => [
    [
      'function' => "\\YourOrMe\\Library\\Class::methodCall()",
      'abs_path' => '/full/path/to/file.php',
      'filename' => 'file.php',
      'lineno' => 30,
      'library_frame' => false, // indicated whether this code is 'owned' by an (external) library or not
      'vars' => [
        'arg1' => 'value',
        'arg2' => 'value2',
      ],
      'pre_context' => [ // lines of code leading to the context line
        '<?php',
        '',
        '// executing query below',
      ],
      'context_line' => '$result = mysql_query("select * from non_existing_table")', // source code of context line
      'post_context' => [// lines of code after to the context line
        '',
        '$table = $fakeTableBuilder->buildWithResult($result);',
        'return $table;',
      ],
    ],
  ],
  'context' => [
    'db' => [
      'instance' => 'my_database', // the database name
      'statement' => 'select * from non_existing_table', // the query being executed
      'type' => 'sql',
      'user' => 'root', // the user executing the query (don't use root!)
    ],
  ],
];

// add the array of spans to the transaction
$transaction->setSpans($spans);

// Do some stuff you want to watch ...
sleep(1);

$agent->stopTransaction($trxName);

// send our transactions to te apm
$agent->send();

Transaction without minimal Meta data and Context

$trxName = 'Demo Simple Transaction';
$agent->startTransaction( $trxName );
// Do some stuff you want to watch ...
$agent->stopTransaction( $trxName );

Transaction with Meta data and Contexts

$trxName = 'Demo Transaction with more Data';
$agent->startTransaction( $trxName );
// Do some stuff you want to watch ...
$agent->stopTransaction( $trxName, [
    'result' => '200',
    'type'   => 'demo'
] );
$agent->getTransaction( $trxName )->setUserContext( [
    'id'    => 12345,
    'email' => "hello@acme.com",
 ] );
 $agent->getTransaction( $trxName )->setCustomContext( [
    'foo' => 'bar',
    'bar' => [ 'foo1' => 'bar1', 'foo2' => 'bar2' ]
] );
$agent->getTransaction( $trxName )->setTags( [ 'k1' => 'v1', 'k2' => 'v2' ] );

Example of a Transaction

This example illustrates how you can monitor a call to another web service.

$agent = new \PhilKra\Agent( [ 'appName' => 'example' ] );

$endpoint = 'https://acme.com/api/';
$payload  = [ 'foo' => 'bar' ];
$trxName  = sprintf('POST %s', $endpoint);
$client   = new GuzzleHttp\Client();

// Start the Transaction
$agent->startTransaction( $trxName );

// Do the call via curl/Guzzle e.g.
$response = $client->request('POST', $endpoint, [
    'json' => $payload
]);

// Stop the Transaction tracing, attach the Status and the sent Payload
$agent->stopTransaction( $trxName, [
    'status'  => $response->getStatusCode(),
    'payload' => $payload,
] );

// Send the collected Traces to the APM server
$agent->send();

Configuration

appName       : Name of this application, Required
appVersion    : Application version, Default: ''
serverUrl     : APM Server Endpoint, Default: 'http://127.0.0.1:8200'
secretToken   : Secret token for APM Server, Default: null
hostname      : Hostname to transmit to the APM Server, Default: gethostname()
active        : Activate the APM Agent, Default: true
timeout       : Guzzle Client timeout, Default: 5
apmVersion    : APM Server Intake API version, Default: 'v1'
env           : $_SERVER vars to send to the APM Server, empty set sends all. Keys are case sensitive, Default: []
cookies       : Cookies to send to the APM Server, empty set sends all. Keys are case sensitive, Default: []
httpClient    : Extended GuzzleHttp\Client Default: []
backtraceLimit: Depth of a transaction backtrace, Default: unlimited

Detailed GuzzleHttp\Client options can be found here.

Example of an extended Configuration

$config = [
    'appName'     => 'My WebApp',
    'appVersion'  => '1.0.42',
    'serverUrl'   => 'http://apm-server.example.com',
    'secretToken' => 'DKKbdsupZWEEzYd4LX34TyHF36vDKRJP',
    'hostname'    => 'node-24.app.network.com',
    'env'         => ['DOCUMENT_ROOT', 'REMOTE_ADDR'],
    'cookies'     => ['my-cookie'],
    'httpClient'  => [
        'verify' => false,
        'proxy'  => 'tcp://localhost:8125'
    ],
];
$agent = new \PhilKra\Agent($config);

Tests

vendor/bin/phpunit

Knowledgebase

Disable Agent for CLI

In case you want to disable the agent dynamically for hybrid SAPI usage, please use the following snippet.

'active' => PHP_SAPI !== 'cli'

In case for the Laravel APM provider:

'active' => PHP_SAPI !== 'cli' && env('ELASTIC_APM_ACTIVE', false)

Thank you to @jblotus, (philkra/elastic-apm-laravel#19)

eddycjy/elastic-apm-php-agent