Merge pull request #101 from oldani/feature/async_support

Feature/async support

Pipfile

@@ -24,6 +24,7 @@ pytest = "*"
 "e1839a8" = {path = ".", editable = true}
 sphinx = "*"
 mypy = "*"
+pytest-asyncio = "*"
 
 
 [scripts]

requests_html.py

@@ -1,7 +1,9 @@
 import sys
 import asyncio
 from urllib.parse import urlparse, urlunparse
+from concurrent.futures import ThreadPoolExecutor
 from concurrent.futures._base import TimeoutError
+from functools import partial
 from typing import Set, Union, List, MutableMapping, Optional
 
 import pyppeteer
@@ -599,3 +601,37 @@ class HTMLSession(requests.Session):
         r = super(HTMLSession, self).request(*args, **kwargs)
 
         return HTMLResponse._from_response(r)
+
+
+class AsyncHTMLSession(requests.Session):
+    """ An async consumable session. """
+
+    def __init__(self, loop=None, workers=None,
+                 mock_browser: bool = True, *args, **kwargs):
+        """ Set or create an event loop and a thread pool.
+
+            :param loop: Asyncio lopp to use.
+            :param workers: Amount of threads to use for executing async calls.
+                If not pass it will default to the number of processors on the
+                machine, multiplied by 5. """
+        super().__init__(*args, **kwargs)
+
+        # Mock a web browser's user agent.
+        if mock_browser:
+            self.headers['User-Agent'] = user_agent()
+
+        self.hooks["response"].append(self.response_hook)
+
+        self.loop = loop or asyncio.get_event_loop()
+        self.thread_pool = ThreadPoolExecutor(max_workers=workers)
+
+    @staticmethod
+    def response_hook(response, **kwargs) -> HTMLResponse:
+        """ Change response enconding and replace it by a HTMLResponse. """
+        response.encoding = DEFAULT_ENCODING
+        return HTMLResponse._from_response(response)
+
+    def request(self, *args, **kwargs):
+        """ Partial original request func and run it in a thread. """
+        func = partial(super().request, *args, **kwargs)
+        return self.loop.run_in_executor(self.thread_pool, func)

tests/test_requests_html.py

@@ -1,7 +1,8 @@
 import os
+from functools import partial
 
 import pytest
-from requests_html import HTMLSession, HTML
+from requests_html import HTMLSession, AsyncHTMLSession, HTML
 from requests_file import FileAdapter
 
 session = HTMLSession()
@@ -15,12 +16,31 @@ def get():
     return session.get(url)
 
 
+@pytest.fixture
+def async_get(event_loop):
+    """ AsyncSession cannot be created global since it will create
+        a different loop from pytest-asyncio. """
+    async_session = AsyncHTMLSession()
+    async_session.mount('file://', FileAdapter())
+    path = os.path.sep.join((os.path.dirname(os.path.abspath(__file__)), 'python.html'))
+    url = 'file://{}'.format(path)
+
+    return partial(async_session.get, url)
+
+
 @pytest.mark.ok
 def test_file_get():
     r = get()
     assert r.status_code == 200
 
 
+@pytest.mark.ok
+@pytest.mark.asyncio
+async def test_async_file_get(async_get):
+    r = await async_get()
+    assert r.status_code == 200
+
+
 @pytest.mark.ok
 def test_class_seperation():
     r = get()
@@ -53,6 +73,7 @@ def test_containing():
     for e in python:
         assert 'python' in e.full_text.lower()
 
+
 @pytest.mark.ok
 def test_attrs():
     r = get()
@@ -71,6 +92,16 @@ def test_links():
     assert len(about.absolute_links) == 6
 
 
+@pytest.mark.ok
+@pytest.mark.asyncio
+async def test_async_links(async_get):
+    r = await async_get()
+    about = r.html.find('#about', first=True)
+
+    assert len(about.links) == 6
+    assert len(about.absolute_links) == 6
+
+
 @pytest.mark.ok
 def test_search():
     r = get()