laravolt/camunda

Convenience Laravel HTTP client wrapper to interact with Camunda REST API.

Installation

composer require laravolt/camunda

Configuration

Prepare your .env:

CAMUNDA_URL=http://localhost:8080/engine-rest

#optional
CAMUNDA_TENANT_ID=
CAMUNDA_USER=
CAMUNDA_PASSWORD=

Add following entries to config/services.php:

'camunda' => [
    'url' => env('CAMUNDA_URL', 'https://localhost:8080/engine-rest'),
    'user' => env('CAMUNDA_USER', 'demo'),
    'password' => env('CAMUNDA_PASSWORD', 'demo'),
    'tenant_id' => env('CAMUNDA_TENANT_ID', ''),
],

Usage

Process Definition

use Laravolt\Camunda\Http\ProcessDefinitionClient;

$variables = ['title' => ['value' => 'Sample Title', 'type' => 'string']];

// Start new process instance
$instance = ProcessDefinitionClient::start(key: 'process_1', variables: $variables);

// Start new process instance with some business key
$instance = ProcessDefinitionClient::start(key: 'process_1', variables: $variables, businessKey: 'somekey');


// Get BPMN definition in XML format
ProcessDefinitionClient::xml(key: 'process_1');
ProcessDefinitionClient::xml(id: 'process_1:xxxx');

// Get all definition
ProcessDefinitionClient::get();

// Get definitions based on some parameters
$params = ['latestVersion' => true];
ProcessDefinitionClient::get($params);

Camunda API reference: https://docs.camunda.org/manual/latest/reference/rest/process-definition/

Process Instance

use Laravolt\Camunda\Http\ProcessInstanceClient;

// Find by ID
$processInstance = ProcessInstanceClient::find(id: 'some-id');

// Get all instances
ProcessInstanceClient::get();

// Get instances based on some parameters
$params = ['businessKeyLike' => 'somekey'];
ProcessInstanceClient::get($params);

ProcessInstanceClient::variables(id: 'some-id');
ProcessInstanceClient::delete(id: 'some-id');

Camunda API reference: https://docs.camunda.org/manual/latest/reference/rest/process-instance/

Message Event

use Laravolt\Camunda\Http\MessageEventClient;
// Start processinstance with message event
// Required
// messageName : message event name
// businessKey : Busniess key for process instance

// Rerturn Process insntance from message event

MessageEventClient::start(messageName: "testing",  businessKey: "businessKey")

Task

use Laravolt\Camunda\Http\TaskClient;

$task = TaskClient::find(id: 'task-id');
$tasks = TaskClient::getByProcessInstanceId(id: 'process-instance-id');
$tasks = TaskClient::getByProcessInstanceIds(ids: 'arrayof-process-instance-ids');
TaskClient::submit(id: 'task-id', variables: ['name' => ['value' => 'Foo', 'type' => 'String']]); // will return true or false
$variables = TaskClient::submitAndReturnVariables(id: 'task-id', variables: ['name' => ['value' => 'Foo', 'type' => 'String']]) // will return array of variable

// Claim a Task
$tasks = TaskClient::claim($task_id,  $user_id);
// Unclaim a Task
$tasks = TaskClient::unclaim($task_id);
// Assign a Task
$tasks = TaskClient::assign($task_id,  $user_id);

Camunda API reference: https://docs.camunda.org/manual/latest/reference/rest/task/

External Task

use Laravolt\Camunda\Http\ExternalTaskClient;

$topics = [
    ['topicName' => 'pdf', 'lockDuration' => 600_000]
];
$externalTasks = ExternalTaskClient::fetchAndLock('worker1', $topics);
foreach ($externalTasks as $externalTask) {
    // do something with $externalTask
    // Mark as complete after finished
    ExternalTaskClient::complete($externalTasks->id);
}

// Unlock some task
ExternalTaskClient::unlock($task->id)

// Get task locked
$externalTaskLocked = ExternalTaskClient::getTaskLocked();

Camunda API reference: https://docs.camunda.org/manual/latest/reference/rest/external-task/

Consume External Task

Create a new job to consume external task via php artisan make:job <JobName> and modify the skeleton:

use Laravolt\Camunda\Dto\ExternalTask;
use Laravolt\Camunda\Http\ExternalTaskClient;

public function __construct(
    public string $workerId,
    public ExternalTask $task
) {
}

public function handle()
{
    // Do something with $this->task, e.g: get the variables and generate PDF
    $variables = \Laravolt\Camunda\Http\ProcessInstanceClient::variables($this->task->processDefinitionId);
    // PdfService::generate()

    // Complete the task
    $status = ExternalTaskClient::complete($this->task->id, $this->workerId);
}

Subscribe to some topic:

// AppServiceProvider.php
use Laravolt\Camunda\Http\ExternalTaskClient;

public function boot()
{
    ExternalTaskClient::subscribe('pdf', GeneratePdf::class);
}

Register the scheduler:

// app/Console/Kernel.php
protected function schedule(Schedule $schedule)
{
    $schedule->command('camunda:consume-external-task --workerId=worker1')->everyMinute();
}

If you need shorter pooling time (sub-minute frequency), please check Laravel Short Schedule.

Reference:

• https://laravel.com/docs/master/scheduling
• https://laravel.com/docs/master/queues
• https://github.com/spatie/laravel-short-schedule

Task History (Completed Task)

use Laravolt\Camunda\Http\TaskHistoryClient;

$completedTask = TaskHistoryClient::find(id: 'task-id');
$completedTasks = TaskHistoryClient::getByProcessInstanceId(id: 'process-instance-id');

Camunda API reference: https://docs.camunda.org/manual/latest/reference/rest/history/task/

Deployment

use Laravolt\Camunda\Http\DeploymentClient;

// Deploy bpmn file(s)
DeploymentClient::create('test-deploy', '/path/to/file.bpmn');
DeploymentClient::create('test-deploy', ['/path/to/file1.bpmn', '/path/to/file2.bpmn']);

// Get deployment list
DeploymentClient::get();

// Find detailed info about some deployment
DeploymentClient::find($id);

// Truncate (delete all) deployments
$cascade = true;
DeploymentClient::truncate($cascade);

// Delete single deployment
DeploymentClient::delete(id: 'test-deploy', cascade: $cascade);

Raw Endpoint

You can utilize Laravolt\Camunda\CamundaClient to call any Camunda REST endpoint.

use Laravolt\Camunda\CamundaClient;

$response = CamundaClient::make()->get('version');
echo $response->status(); // 200
echo $response->object(); // sdtClass
echo $response->json(); // array, something like ["version" => "7.14.0"]

CamundaClient::make() is a wrapper for Laravel HTTP Client with base URL already set based on your Camunda services configuration. Take a look at the documentation for more information.