Updated DB_Helper by adding firebase methods.

venv/Lib/site-packages/requests_toolbelt/threaded/__init__.py

@@ -0,0 +1,97 @@
+"""
+This module provides the API for ``requests_toolbelt.threaded``.
+
+The module provides a clean and simple API for making requests via a thread
+pool. The thread pool will use sessions for increased performance.
+
+A simple use-case is:
+
+.. code-block:: python
+
+    from requests_toolbelt import threaded
+
+    urls_to_get = [{
+        'url': 'https://api.github.com/users/sigmavirus24',
+        'method': 'GET',
+    }, {
+        'url': 'https://api.github.com/repos/sigmavirus24/requests-toolbelt',
+        'method': 'GET',
+    }, {
+        'url': 'https://google.com',
+        'method': 'GET',
+    }]
+    responses, errors = threaded.map(urls_to_get)
+
+By default, the threaded submodule will detect the number of CPUs your
+computer has and use that if no other number of processes is selected. To
+change this, always use the keyword argument ``num_processes``. Using the
+above example, we would expand it like so:
+
+.. code-block:: python
+
+    responses, errors = threaded.map(urls_to_get, num_processes=10)
+
+You can also customize how a :class:`requests.Session` is initialized by
+creating a callback function:
+
+.. code-block:: python
+
+    from requests_toolbelt import user_agent
+
+    def initialize_session(session):
+        session.headers['User-Agent'] = user_agent('my-scraper', '0.1')
+        session.headers['Accept'] = 'application/json'
+
+    responses, errors = threaded.map(urls_to_get,
+                                     initializer=initialize_session)
+
+.. autofunction:: requests_toolbelt.threaded.map
+
+Inspiration is blatantly drawn from the standard library's multiprocessing
+library. See the following references:
+
+- multiprocessing's `pool source`_
+
+- map and map_async `inspiration`_
+
+.. _pool source:
+    https://hg.python.org/cpython/file/8ef4f75a8018/Lib/multiprocessing/pool.py
+.. _inspiration:
+    https://hg.python.org/cpython/file/8ef4f75a8018/Lib/multiprocessing/pool.py#l340
+"""
+from . import pool
+from .._compat import queue
+
+
+def map(requests, **kwargs):
+    r"""Simple interface to the threaded Pool object.
+
+    This function takes a list of dictionaries representing requests to make
+    using Sessions in threads and returns a tuple where the first item is
+    a generator of successful responses and the second is a generator of
+    exceptions.
+
+    :param list requests:
+        Collection of dictionaries representing requests to make with the Pool
+        object.
+    :param \*\*kwargs:
+        Keyword arguments that are passed to the
+        :class:`~requests_toolbelt.threaded.pool.Pool` object.
+    :returns: Tuple of responses and exceptions from the pool
+    :rtype: (:class:`~requests_toolbelt.threaded.pool.ThreadResponse`,
+        :class:`~requests_toolbelt.threaded.pool.ThreadException`)
+    """
+    if not (requests and all(isinstance(r, dict) for r in requests)):
+        raise ValueError('map expects a list of dictionaries.')
+
+    # Build our queue of requests
+    job_queue = queue.Queue()
+    for request in requests:
+        job_queue.put(request)
+
+    # Ensure the user doesn't try to pass their own job_queue
+    kwargs['job_queue'] = job_queue
+
+    threadpool = pool.Pool(**kwargs)
+    threadpool.join_all()
+    return threadpool.responses(), threadpool.exceptions()

venv/Lib/site-packages/requests_toolbelt/threaded/pool.py

@@ -0,0 +1,211 @@
+"""Module implementing the Pool for :mod:``requests_toolbelt.threaded``."""
+import multiprocessing
+import requests
+
+from . import thread
+from .._compat import queue
+
+
+class Pool(object):
+    """Pool that manages the threads containing sessions.
+
+    :param queue:
+        The queue you're expected to use to which you should add items.
+    :type queue: queue.Queue
+    :param initializer:
+        Function used to initialize an instance of ``session``.
+    :type initializer: collections.Callable
+    :param auth_generator:
+        Function used to generate new auth credentials for the session.
+    :type auth_generator: collections.Callable
+    :param int num_threads:
+        Number of threads to create.
+    :param session:
+    :type session: requests.Session
+    """
+
+    def __init__(self, job_queue, initializer=None, auth_generator=None,
+                 num_processes=None, session=requests.Session):
+        if num_processes is None:
+            num_processes = multiprocessing.cpu_count() or 1
+
+        if num_processes < 1:
+            raise ValueError("Number of processes should at least be 1.")
+
+        self._job_queue = job_queue
+        self._response_queue = queue.Queue()
+        self._exc_queue = queue.Queue()
+        self._processes = num_processes
+        self._initializer = initializer or _identity
+        self._auth = auth_generator or _identity
+        self._session = session
+        self._pool = [
+            thread.SessionThread(self._new_session(), self._job_queue,
+                                 self._response_queue, self._exc_queue)
+            for _ in range(self._processes)
+        ]
+
+    def _new_session(self):
+        return self._auth(self._initializer(self._session()))
+
+    @classmethod
+    def from_exceptions(cls, exceptions, **kwargs):
+        r"""Create a :class:`~Pool` from an :class:`~ThreadException`\ s.
+
+        Provided an iterable that provides :class:`~ThreadException` objects,
+        this classmethod will generate a new pool to retry the requests that
+        caused the exceptions.
+
+        :param exceptions:
+            Iterable that returns :class:`~ThreadException`
+        :type exceptions: iterable
+        :param kwargs:
+            Keyword arguments passed to the :class:`~Pool` initializer.
+        :returns: An initialized :class:`~Pool` object.
+        :rtype: :class:`~Pool`
+        """
+        job_queue = queue.Queue()
+        for exc in exceptions:
+            job_queue.put(exc.request_kwargs)
+
+        return cls(job_queue=job_queue, **kwargs)
+
+    @classmethod
+    def from_urls(cls, urls, request_kwargs=None, **kwargs):
+        """Create a :class:`~Pool` from an iterable of URLs.
+
+        :param urls:
+            Iterable that returns URLs with which we create a pool.
+        :type urls: iterable
+        :param dict request_kwargs:
+            Dictionary of other keyword arguments to provide to the request
+            method.
+        :param kwargs:
+            Keyword arguments passed to the :class:`~Pool` initializer.
+        :returns: An initialized :class:`~Pool` object.
+        :rtype: :class:`~Pool`
+        """
+        request_dict = {'method': 'GET'}
+        request_dict.update(request_kwargs or {})
+        job_queue = queue.Queue()
+        for url in urls:
+            job = request_dict.copy()
+            job.update({'url': url})
+            job_queue.put(job)
+
+        return cls(job_queue=job_queue, **kwargs)
+
+    def exceptions(self):
+        """Iterate over all the exceptions in the pool.
+
+        :returns: Generator of :class:`~ThreadException`
+        """
+        while True:
+            exc = self.get_exception()
+            if exc is None:
+                break
+            yield exc
+
+    def get_exception(self):
+        """Get an exception from the pool.
+
+        :rtype: :class:`~ThreadException`
+        """
+        try:
+            (request, exc) = self._exc_queue.get_nowait()
+        except queue.Empty:
+            return None
+        else:
+            return ThreadException(request, exc)
+
+    def get_response(self):
+        """Get a response from the pool.
+
+        :rtype: :class:`~ThreadResponse`
+        """
+        try:
+            (request, response) = self._response_queue.get_nowait()
+        except queue.Empty:
+            return None
+        else:
+            return ThreadResponse(request, response)
+
+    def responses(self):
+        """Iterate over all the responses in the pool.
+
+        :returns: Generator of :class:`~ThreadResponse`
+        """
+        while True:
+            resp = self.get_response()
+            if resp is None:
+                break
+            yield resp
+
+    def join_all(self):
+        """Join all the threads to the master thread."""
+        for session_thread in self._pool:
+            session_thread.join()
+
+
+class ThreadProxy(object):
+    proxied_attr = None
+
+    def __getattr__(self, attr):
+        """Proxy attribute accesses to the proxied object."""
+        get = object.__getattribute__
+        if attr not in self.attrs:
+            response = get(self, self.proxied_attr)
+            return getattr(response, attr)
+        else:
+            return get(self, attr)
+
+
+class ThreadResponse(ThreadProxy):
+    """A wrapper around a requests Response object.
+
+    This will proxy most attribute access actions to the Response object. For
+    example, if you wanted the parsed JSON from the response, you might do:
+
+    .. code-block:: python
+
+        thread_response = pool.get_response()
+        json = thread_response.json()
+
+    """
+    proxied_attr = 'response'
+    attrs = frozenset(['request_kwargs', 'response'])
+
+    def __init__(self, request_kwargs, response):
+        #: The original keyword arguments provided to the queue
+        self.request_kwargs = request_kwargs
+        #: The wrapped response
+        self.response = response
+
+
+class ThreadException(ThreadProxy):
+    """A wrapper around an exception raised during a request.
+
+    This will proxy most attribute access actions to the exception object. For
+    example, if you wanted the message from the exception, you might do:
+
+    .. code-block:: python
+
+        thread_exc = pool.get_exception()
+        msg = thread_exc.message
+
+    """
+    proxied_attr = 'exception'
+    attrs = frozenset(['request_kwargs', 'exception'])
+
+    def __init__(self, request_kwargs, exception):
+        #: The original keyword arguments provided to the queue
+        self.request_kwargs = request_kwargs
+        #: The captured and wrapped exception
+        self.exception = exception
+
+
+def _identity(session_obj):
+    return session_obj
+
+
+__all__ = ['ThreadException', 'ThreadResponse', 'Pool']

venv/Lib/site-packages/requests_toolbelt/threaded/thread.py

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+"""Module containing the SessionThread class."""
+import threading
+import uuid
+
+import requests.exceptions as exc
+
+from .._compat import queue
+
+
+class SessionThread(object):
+    def __init__(self, initialized_session, job_queue, response_queue,
+                 exception_queue):
+        self._session = initialized_session
+        self._jobs = job_queue
+        self._create_worker()
+        self._responses = response_queue
+        self._exceptions = exception_queue
+
+    def _create_worker(self):
+        self._worker = threading.Thread(
+            target=self._make_request,
+            name=uuid.uuid4(),
+        )
+        self._worker.daemon = True
+        self._worker._state = 0
+        self._worker.start()
+
+    def _handle_request(self, kwargs):
+        try:
+            response = self._session.request(**kwargs)
+        except exc.RequestException as e:
+            self._exceptions.put((kwargs, e))
+        else:
+            self._responses.put((kwargs, response))
+        finally:
+            self._jobs.task_done()
+
+    def _make_request(self):
+        while True:
+            try:
+                kwargs = self._jobs.get_nowait()
+            except queue.Empty:
+                break
+
+            self._handle_request(kwargs)
+
+    def is_alive(self):
+        """Proxy to the thread's ``is_alive`` method."""
+        return self._worker.is_alive()
+
+    def join(self):
+        """Join this thread to the master thread."""
+        self._worker.join()