Convert watch page to flask framework

1 files changed, 246 insertions, 0 deletions

diff --git a/python/flask/testing.py b/python/flask/testing.py
new file mode 100644
index 0000000..114c5cc
--- /dev/null
+++ b/python/flask/testing.py
@@ -0,0 +1,246 @@
+# -*- coding: utf-8 -*-
+"""
+    flask.testing
+    ~~~~~~~~~~~~~
+
+    Implements test support helpers.  This module is lazily imported
+    and usually not used in production environments.
+
+    :copyright: © 2010 by the Pallets team.
+    :license: BSD, see LICENSE for more details.
+"""
+
+import werkzeug
+from contextlib import contextmanager
+
+from click.testing import CliRunner
+from flask.cli import ScriptInfo
+from werkzeug.test import Client, EnvironBuilder
+from flask import _request_ctx_stack
+from flask.json import dumps as json_dumps
+from werkzeug.urls import url_parse
+
+
+def make_test_environ_builder(
+    app, path='/', base_url=None, subdomain=None, url_scheme=None,
+    *args, **kwargs
+):
+    """Create a :class:`~werkzeug.test.EnvironBuilder`, taking some
+    defaults from the application.
+
+    :param app: The Flask application to configure the environment from.
+    :param path: URL path being requested.
+    :param base_url: Base URL where the app is being served, which
+        ``path`` is relative to. If not given, built from
+        :data:`PREFERRED_URL_SCHEME`, ``subdomain``,
+        :data:`SERVER_NAME`, and :data:`APPLICATION_ROOT`.
+    :param subdomain: Subdomain name to append to :data:`SERVER_NAME`.
+    :param url_scheme: Scheme to use instead of
+        :data:`PREFERRED_URL_SCHEME`.
+    :param json: If given, this is serialized as JSON and passed as
+        ``data``. Also defaults ``content_type`` to
+        ``application/json``.
+    :param args: other positional arguments passed to
+        :class:`~werkzeug.test.EnvironBuilder`.
+    :param kwargs: other keyword arguments passed to
+        :class:`~werkzeug.test.EnvironBuilder`.
+    """
+
+    assert (
+        not (base_url or subdomain or url_scheme)
+        or (base_url is not None) != bool(subdomain or url_scheme)
+    ), 'Cannot pass "subdomain" or "url_scheme" with "base_url".'
+
+    if base_url is None:
+        http_host = app.config.get('SERVER_NAME') or 'localhost'
+        app_root = app.config['APPLICATION_ROOT']
+
+        if subdomain:
+            http_host = '{0}.{1}'.format(subdomain, http_host)
+
+        if url_scheme is None:
+            url_scheme = app.config['PREFERRED_URL_SCHEME']
+
+        url = url_parse(path)
+        base_url = '{scheme}://{netloc}/{path}'.format(
+            scheme=url.scheme or url_scheme,
+            netloc=url.netloc or http_host,
+            path=app_root.lstrip('/')
+        )
+        path = url.path
+
+        if url.query:
+            sep = b'?' if isinstance(url.query, bytes) else '?'
+            path += sep + url.query
+
+    # TODO use EnvironBuilder.json_dumps once we require Werkzeug 0.15
+    if 'json' in kwargs:
+        assert 'data' not in kwargs, "Client cannot provide both 'json' and 'data'."
+        kwargs['data'] = json_dumps(kwargs.pop('json'), app=app)
+
+        if 'content_type' not in kwargs:
+            kwargs['content_type'] = 'application/json'
+
+    return EnvironBuilder(path, base_url, *args, **kwargs)
+
+
+class FlaskClient(Client):
+    """Works like a regular Werkzeug test client but has some knowledge about
+    how Flask works to defer the cleanup of the request context stack to the
+    end of a ``with`` body when used in a ``with`` statement.  For general
+    information about how to use this class refer to
+    :class:`werkzeug.test.Client`.
+
+    .. versionchanged:: 0.12
+       `app.test_client()` includes preset default environment, which can be
+       set after instantiation of the `app.test_client()` object in
+       `client.environ_base`.
+
+    Basic usage is outlined in the :ref:`testing` chapter.
+    """
+
+    preserve_context = False
+
+    def __init__(self, *args, **kwargs):
+        super(FlaskClient, self).__init__(*args, **kwargs)
+        self.environ_base = {
+            "REMOTE_ADDR": "127.0.0.1",
+            "HTTP_USER_AGENT": "werkzeug/" + werkzeug.__version__
+        }
+
+    @contextmanager
+    def session_transaction(self, *args, **kwargs):
+        """When used in combination with a ``with`` statement this opens a
+        session transaction.  This can be used to modify the session that
+        the test client uses.  Once the ``with`` block is left the session is
+        stored back.
+
+        ::
+
+            with client.session_transaction() as session:
+                session['value'] = 42
+
+        Internally this is implemented by going through a temporary test
+        request context and since session handling could depend on
+        request variables this function accepts the same arguments as
+        :meth:`~flask.Flask.test_request_context` which are directly
+        passed through.
+        """
+        if self.cookie_jar is None:
+            raise RuntimeError('Session transactions only make sense '
+                               'with cookies enabled.')
+        app = self.application
+        environ_overrides = kwargs.setdefault('environ_overrides', {})
+        self.cookie_jar.inject_wsgi(environ_overrides)
+        outer_reqctx = _request_ctx_stack.top
+        with app.test_request_context(*args, **kwargs) as c:
+            session_interface = app.session_interface
+            sess = session_interface.open_session(app, c.request)
+            if sess is None:
+                raise RuntimeError('Session backend did not open a session. '
+                                   'Check the configuration')
+
+            # Since we have to open a new request context for the session
+            # handling we want to make sure that we hide out own context
+            # from the caller.  By pushing the original request context
+            # (or None) on top of this and popping it we get exactly that
+            # behavior.  It's important to not use the push and pop
+            # methods of the actual request context object since that would
+            # mean that cleanup handlers are called
+            _request_ctx_stack.push(outer_reqctx)
+            try:
+                yield sess
+            finally:
+                _request_ctx_stack.pop()
+
+            resp = app.response_class()
+            if not session_interface.is_null_session(sess):
+                session_interface.save_session(app, sess, resp)
+            headers = resp.get_wsgi_headers(c.request.environ)
+            self.cookie_jar.extract_wsgi(c.request.environ, headers)
+
+    def open(self, *args, **kwargs):
+        as_tuple = kwargs.pop('as_tuple', False)
+        buffered = kwargs.pop('buffered', False)
+        follow_redirects = kwargs.pop('follow_redirects', False)
+
+        if (
+            not kwargs and len(args) == 1
+            and isinstance(args[0], (EnvironBuilder, dict))
+        ):
+            environ = self.environ_base.copy()
+
+            if isinstance(args[0], EnvironBuilder):
+                environ.update(args[0].get_environ())
+            else:
+                environ.update(args[0])
+
+            environ['flask._preserve_context'] = self.preserve_context
+        else:
+            kwargs.setdefault('environ_overrides', {}) \
+                ['flask._preserve_context'] = self.preserve_context
+            kwargs.setdefault('environ_base', self.environ_base)
+            builder = make_test_environ_builder(
+                self.application, *args, **kwargs
+            )
+
+            try:
+                environ = builder.get_environ()
+            finally:
+                builder.close()
+
+        return Client.open(
+            self, environ,
+            as_tuple=as_tuple,
+            buffered=buffered,
+            follow_redirects=follow_redirects
+        )
+
+    def __enter__(self):
+        if self.preserve_context:
+            raise RuntimeError('Cannot nest client invocations')
+        self.preserve_context = True
+        return self
+
+    def __exit__(self, exc_type, exc_value, tb):
+        self.preserve_context = False
+
+        # on exit we want to clean up earlier.  Normally the request context
+        # stays preserved until the next request in the same thread comes
+        # in.  See RequestGlobals.push() for the general behavior.
+        top = _request_ctx_stack.top
+        if top is not None and top.preserved:
+            top.pop()
+
+
+class FlaskCliRunner(CliRunner):
+    """A :class:`~click.testing.CliRunner` for testing a Flask app's
+    CLI commands. Typically created using
+    :meth:`~flask.Flask.test_cli_runner`. See :ref:`testing-cli`.
+    """
+    def __init__(self, app, **kwargs):
+        self.app = app
+        super(FlaskCliRunner, self).__init__(**kwargs)
+
+    def invoke(self, cli=None, args=None, **kwargs):
+        """Invokes a CLI command in an isolated environment. See
+        :meth:`CliRunner.invoke <click.testing.CliRunner.invoke>` for
+        full method documentation. See :ref:`testing-cli` for examples.
+
+        If the ``obj`` argument is not given, passes an instance of
+        :class:`~flask.cli.ScriptInfo` that knows how to load the Flask
+        app being tested.
+
+        :param cli: Command object to invoke. Default is the app's
+            :attr:`~flask.app.Flask.cli` group.
+        :param args: List of strings to invoke the command with.
+
+        :return: a :class:`~click.testing.Result` object.
+        """
+        if cli is None:
+            cli = self.app.cli
+
+        if 'obj' not in kwargs:
+            kwargs['obj'] = ScriptInfo(create_app=lambda: self.app)
+
+        return super(FlaskCliRunner, self).invoke(cli, args, **kwargs)