test_reqctx.py

# -*- coding: utf-8 -*-
"""
    tests.reqctx
    ~~~~~~~~~~~~

    Tests the request context.

    :copyright: (c) 2015 by Armin Ronacher.
    :license: BSD, see LICENSE for more details.
"""

import pytest

import flask
from flask.sessions import SessionInterface

try:
    from greenlet import greenlet
except ImportError:
    greenlet = None


def test_teardown_on_pop(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    ctx = app.test_request_context()
    ctx.push()
    assert buffer == []
    ctx.pop()
    assert buffer == [None]


def test_teardown_with_previous_exception(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    try:
        raise Exception('dummy')
    except Exception:
        pass

    with app.test_request_context():
        assert buffer == []
    assert buffer == [None]


def test_teardown_with_handled_exception(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    with app.test_request_context():
        assert buffer == []
        try:
            raise Exception('dummy')
        except Exception:
            pass
    assert buffer == [None]


def test_proper_test_request_context(app):
    app.config.update(
        SERVER_NAME='localhost.localdomain:5000'
    )

    @app.route('/')
    def index():
        return None

    @app.route('/', subdomain='foo')
    def sub():
        return None

    with app.test_request_context('/'):
        assert flask.url_for('index', _external=True) == \
               'http://localhost.localdomain:5000/'

    with app.test_request_context('/'):
        assert flask.url_for('sub', _external=True) == \
               'http://foo.localhost.localdomain:5000/'

    try:
        with app.test_request_context('/', environ_overrides={'HTTP_HOST': 'localhost'}):
            pass
    except ValueError as e:
        assert str(e) == (
            "the server name provided "
            "('localhost.localdomain:5000') does not match the "
            "server name from the WSGI environment ('localhost')"
        )

    app.config.update(SERVER_NAME='localhost')
    with app.test_request_context('/', environ_overrides={'SERVER_NAME': 'localhost'}):
        pass

    app.config.update(SERVER_NAME='localhost:80')
    with app.test_request_context('/', environ_overrides={'SERVER_NAME': 'localhost:80'}):
        pass


def test_context_binding(app):
    @app.route('/')
    def index():
        return 'Hello %s!' % flask.request.args['name']

    @app.route('/meh')
    def meh():
        return flask.request.url

    with app.test_request_context('/?name=World'):
        assert index() == 'Hello World!'
    with app.test_request_context('/meh'):
        assert meh() == 'http://localhost/meh'
    assert flask._request_ctx_stack.top is None


def test_context_test(app):
    assert not flask.request
    assert not flask.has_request_context()
    ctx = app.test_request_context()
    ctx.push()
    try:
        assert flask.request
        assert flask.has_request_context()
    finally:
        ctx.pop()


def test_manual_context_binding(app):
    @app.route('/')
    def index():
        return 'Hello %s!' % flask.request.args['name']

    ctx = app.test_request_context('/?name=World')
    ctx.push()
    assert index() == 'Hello World!'
    ctx.pop()
    with pytest.raises(RuntimeError):
        index()


@pytest.mark.skipif(greenlet is None, reason='greenlet not installed')
class TestGreenletContextCopying(object):

    def test_greenlet_context_copying(self, app, client):
        greenlets = []

        @app.route('/')
        def index():
            reqctx = flask._request_ctx_stack.top.copy()

            def g():
                assert not flask.request
                assert not flask.current_app
                with reqctx:
                    assert flask.request
                    assert flask.current_app == app
                    assert flask.request.path == '/'
                    assert flask.request.args['foo'] == 'bar'
                assert not flask.request
                return 42

            greenlets.append(greenlet(g))
            return 'Hello World!'

        rv = client.get('/?foo=bar')
        assert rv.data == b'Hello World!'

        result = greenlets[0].run()
        assert result == 42

    def test_greenlet_context_copying_api(self, app, client):
        greenlets = []

        @app.route('/')
        def index():
            reqctx = flask._request_ctx_stack.top.copy()

            @flask.copy_current_request_context
            def g():
                assert flask.request
                assert flask.current_app == app
                assert flask.request.path == '/'
                assert flask.request.args['foo'] == 'bar'
                return 42

            greenlets.append(greenlet(g))
            return 'Hello World!'

        rv = client.get('/?foo=bar')
        assert rv.data == b'Hello World!'

        result = greenlets[0].run()
        assert result == 42


def test_session_error_pops_context():
    class SessionError(Exception):
        pass

    class FailingSessionInterface(SessionInterface):
        def open_session(self, app, request):
            raise SessionError()

    class CustomFlask(flask.Flask):
        session_interface = FailingSessionInterface()

    app = CustomFlask(__name__)

    @app.route('/')
    def index():
        # shouldn't get here
        assert False

    response = app.test_client().get('/')
    assert response.status_code == 500
    assert not flask.request
    assert not flask.current_app