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# Flowable External Worker Library for Python | ||
# Flowable External Client Python | ||
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[License: | ||
![license](https://img.shields.io/hexpm/l/plug.svg)](https://github.com/flowable/flowable-external-client-python/blob/main/LICENSE) | ||
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||
![Flowable Actions CI](https://github.com/flowable/flowable-external-client-python/actions/workflows/main.yml/badge.svg?branch=main) | ||
|
||
An _External Worker Task_ in BPMN or CMMN is a task where the custom logic of that task is executed externally to Flowable, i.e. on another server. | ||
When the process or case engine arrives at such a task, it will create an **external job**, which is exposed over the REST API. | ||
Through this REST API, the job can be acquired and locked. | ||
Once locked, the custom logic is responsible for signalling over REST that the work is done and the process or case can continue. | ||
|
||
This project makes implementing such custom logic in Python easy by not having the worry about the low-level details of the REST API and focus on the actual custom business logic. | ||
Integrations for other languages are available, too. | ||
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## Authentication | ||
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The different ways to authenticate are explained in the [documentation of the underlying requests HTTP library which is used to connect to Flowable](https://requests.readthedocs.io/en/latest/user/authentication/). | ||
The `ExternalWorkerClient` accepts as a parameter `auth` an implementation of `requests.auth.AuthBase`. | ||
There are default implementations for example for basic authentication e.g. `HTTPBasicAuth("admin", "test")`. | ||
Flowable offers a bearer token implementation `FlowableCloudToken` which allows to specify an access token to the Flowable Cloud offering. | ||
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## Sample | ||
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### Cloud | ||
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The usage with Flowable Cloud is simpler, since everything is pre-configured. | ||
However, it's required to either use the user credentials or to pre-configure a personal access token. | ||
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```python | ||
from flowable.external_worker_client import ExternalWorkerClient | ||
from flowable.external_worker_client.cloud_token import FlowableCloudToken | ||
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client = ExternalWorkerClient(auth=FlowableCloudToken("<personal-access-token>")) | ||
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def my_callback(job, worker_result_builder): | ||
print('Executed job: ' + job.id) | ||
return worker_result_builder.success() | ||
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subscription = client.subscribe('myTopic', my_callback) | ||
``` | ||
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### Local | ||
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||
The following is an example how you can connect to a Flowable instance running at `http://host.docker.internal:8090` and process all messages retrieved on the topic `myTopic`: | ||
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||
```python | ||
from flowable.external_worker_client import ExternalWorkerClient | ||
from requests.auth import HTTPBasicAuth | ||
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client = ExternalWorkerClient('http://localhost:8090/flowable-work', auth=HTTPBasicAuth("admin", "test")) | ||
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def my_callback(job, worker_result_builder): | ||
print('Executed job: ' + job.id) | ||
return worker_result_builder.success() | ||
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subscription = client.subscribe('myTopic', my_callback) | ||
``` | ||
This is a collection of multiple Flowable Python clients. | ||
Currently, the project consists out of: | ||
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* [External Worker Client](./external-worker): A library to connect custom application code to Flowable with the external worker functionality | ||
* [Robocorp Client](./robocorp-client): A python module to execute Robocorp actions and tasks with the Flowable Robocorp task (based on the external worker). |
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Original file line number | Diff line number | Diff line change |
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# Flowable External Worker Library for Python | ||
|
||
[License: | ||
![license](https://img.shields.io/hexpm/l/plug.svg)](https://github.com/flowable/flowable-external-client-python/blob/main/LICENSE) | ||
|
||
![Flowable Actions CI](https://github.com/flowable/flowable-external-client-python/actions/workflows/main.yml/badge.svg?branch=main) | ||
|
||
An _External Worker Task_ in BPMN or CMMN is a task where the custom logic of that task is executed externally to Flowable, i.e. on another server. | ||
When the process or case engine arrives at such a task, it will create an **external job**, which is exposed over the REST API. | ||
Through this REST API, the job can be acquired and locked. | ||
Once locked, the custom logic is responsible for signalling over REST that the work is done and the process or case can continue. | ||
|
||
This project makes implementing such custom logic in Python easy by not having the worry about the low-level details of the REST API and focus on the actual custom business logic. | ||
Integrations for other languages are available, too. | ||
|
||
## Authentication | ||
|
||
The different ways to authenticate are explained in the [documentation of the underlying requests HTTP library which is used to connect to Flowable](https://requests.readthedocs.io/en/latest/user/authentication/). | ||
The `ExternalWorkerClient` accepts as a parameter `auth` an implementation of `requests.auth.AuthBase`. | ||
There are default implementations for example for basic authentication e.g. `HTTPBasicAuth("admin", "test")`. | ||
Flowable offers a bearer token implementation `FlowableCloudToken` which allows to specify an access token to the Flowable Cloud offering. | ||
|
||
## Sample | ||
|
||
### Cloud | ||
|
||
The usage with Flowable Cloud is simpler, since everything is pre-configured. | ||
However, it's required to either use the user credentials or to pre-configure a personal access token. | ||
|
||
```python | ||
from flowable.external_worker_client import ExternalWorkerClient | ||
from flowable.external_worker_client.cloud_token import FlowableCloudToken | ||
|
||
client = ExternalWorkerClient(auth=FlowableCloudToken("<personal-access-token>")) | ||
|
||
def my_callback(job, worker_result_builder): | ||
print('Executed job: ' + job.id) | ||
return worker_result_builder.success() | ||
|
||
subscription = client.subscribe('myTopic', my_callback) | ||
``` | ||
|
||
### Local | ||
|
||
The following is an example how you can connect to a Flowable instance running at `http://host.docker.internal:8090` and process all messages retrieved on the topic `myTopic`: | ||
|
||
```python | ||
from flowable.external_worker_client import ExternalWorkerClient | ||
from requests.auth import HTTPBasicAuth | ||
|
||
client = ExternalWorkerClient('http://localhost:8090/flowable-work', auth=HTTPBasicAuth("admin", "test")) | ||
|
||
def my_callback(job, worker_result_builder): | ||
print('Executed job: ' + job.id) | ||
return worker_result_builder.success() | ||
|
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subscription = client.subscribe('myTopic', my_callback) | ||
``` | ||
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