loose-server 0.4

Dynamically configurable server

loose-server

Loose server is a simple configurable server. It can be used to create temporary servers, dynamically add or remove endpoints and set responses for them from an application.

Installation

$ python -m pip install loose-server

Additional packages will be installed: Flask, flask-restful (required for the server) and requests (required for the http clients).

Usage

Loose server has 2 variations:

• Standalone server with API to manage rules via HTTP.

• Flask application that can be used as a configurable mock in unit-tests.

Standalone server

A server can be started by the command

$ python -m looseserver.default.server.run
 * Serving Flask app "looseserver" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:50000/ (Press CTRL+C to quit)

API endpoints are nested to the base configuration url. By default it is /_configuration/.

from looseserver.default.client.rule import PathRule
from looseserver.default.client.response import FixedResponse
from looseserver.default.client.http import HTTPClient

client = HTTPClient(configuration_url="http://127.0.0.1:50000/_configuration/")

path_rule_spec = PathRule(path="example")
path_rule = client.create_rule(rule=path_rule_spec)

json_response = FixedResponse(
    status=200,
    headers={"Content-Type": "application/json"},
    body='{"key": "value"}',
    )
client.set_response(rule_id=path_rule.rule_id, response=json_response)

All configured endpoints have a common prefix. By default it is /routes/. The response can be obtained by the following request

$ curl http://127.0.0.1:50000/routes/example -i
HTTP/1.0 200 OK
Content-Type: application/json
Content-Length: 16
Server: Werkzeug/0.15.2 Python/3.5.2
Date: Fri, 05 Apr 2019 14:08:50 GMT

{"key": "value"}

Configurable mock

Loose server can be used as a mock server in the following way

from urllib.parse import urljoin

from looseserver.server.application import DEFAULT_BASE_ENDPOINT, DEFAULT_CONFIGURATION_ENDPOINT
from looseserver.default.server.application import configure_application
from looseserver.default.client.flask import FlaskClient
from looseserver.default.client.rule import PathRule
from looseserver.default.client.response import FixedResponse

application = configure_application()

app_client=application.test_client()

client = FlaskClient(
    configuration_url=DEFAULT_CONFIGURATION_ENDPOINT,
    application_client=app_client,
    )

path_rule_spec = PathRule(path="example")
path_rule = client.create_rule(rule=path_rule_spec)

json_response = FixedResponse(
    status=200,
    headers={"Content-Type": "application/json"},
    body='{"key": "value"}',
    )
client.set_response(rule_id=path_rule.rule_id, response=json_response)

response = app_client.get(urljoin(DEFAULT_BASE_ENDPOINT, "example"))
assert response.headers["Content-Type"] == "application/json"
assert response.json == {'key': 'value'}