Thanks to Marcus for the SSL patch for 2.6 compatibility. Added greenlet and pyopenssl dependencies to setup.py.

eventlet/green/urllib2.py

@@ -51,7 +51,7 @@ def build_opener(*handlers):
     default_classes = [ProxyHandler, UnknownHandler, HTTPHandler,
                        HTTPDefaultErrorHandler, HTTPRedirectHandler,
                        FTPHandler, FileHandler, HTTPErrorProcessor]
-    if hasattr(httplib, 'HTTPS'):
+    if hasattr(urllib2, 'HTTPSHandler'):
         default_classes.append(HTTPSHandler)
     skip = set()
     for klass in default_classes:

eventlet/util.py

@@ -59,7 +59,11 @@ def tcp_socket():
 
 
 try:
-    __original_ssl__ = socket.ssl
+    try:
+        import ssl
+        __original_ssl__ = ssl.wrap_socket
+    except ImportError:
+        __original_ssl__ = socket.ssl
 except AttributeError:
     __original_ssl__ = None
 

examples/webcrawler.py

@@ -0,0 +1,52 @@
+#! /usr/bin/env python
+"""\
+@file webcrawler.py
+
+This is a simple web "crawler" that fetches a bunch of urls using a coroutine pool.  It fetches as
+ many urls at time as coroutines in the pool.
+
+Copyright (c) 2007, Linden Research, Inc.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+urls = ["http://www.google.com/intl/en_ALL/images/logo.gif",
+        "http://us.i1.yimg.com/us.yimg.com/i/ww/beta/y3.gif",
+        "http://eventlet.net"]
+
+import time
+from eventlet.green import urllib2
+from eventlet import coros
+
+def fetch(url):
+    # we could do something interesting with the result, but this is
+    # example code, so we'll just report that we did it
+    print "%s fetching %s" % (time.asctime(), url)
+    req = urllib2.urlopen(url)
+    print "%s fetched %s (%s)" % (time.asctime(), url, len(req.read()))
+
+pool = coros.CoroutinePool(max_size=4)
+waiters = []
+for url in urls:
+    waiters.append(pool.execute(fetch, url))
+
+# wait for all the coroutines to come back before exiting the process
+for waiter in waiters:
+    waiter.wait()
+
+