Add WSGI support

This first work on WSGI is only to stop using ZServer (Medusa),
which is a required step before moving to Zope 4. This means that
Zope should behave almost exactly the same way as before, notably:

- We don't take advantage yet of what WSGI offers, like IPv6.
- There's extra code to handle errors the same way as before
  (this is something we'll have to change for Zope 4).

The most significant change in behaviour is that the chosen WSGI server
(waitress) does some of the HTTP work in worker threads (Medusa does it
entirely in the IO thread), and the biggest consequence concerns the
deadlock debugger that is now run from the worker thread:
- it does not work if all threads are blocked
- doing better would require to patch waitress in a quite ugly way

About TimerService, we simplify things by removing the egg.
In zope.conf, it's possible to import from the product.

/reviewed-on nexedi/erp5!883

product/CMFActivity/ActivityTool.py

@@ -60,12 +60,7 @@ import transaction
 from App.config import getConfiguration
 from Shared.DC.ZRDB.Results import Results
 
-import Products.Localizer.patches
-localizer_lock = Products.Localizer.patches._requests_lock
-localizer_contexts = Products.Localizer.patches._requests
-LocalizerContext = lambda request: request
-
-
+from zope.globalrequest import getRequest, setRequest
 from Products.MailHost.MailHost import MailHostError
 
 from zLOG import LOG, INFO, WARNING, ERROR
@@ -139,14 +134,19 @@ def getServerAddress():
     global _server_address
     if _server_address is None:
         ip = port = ''
-        from asyncore import socket_map
-        for k, v in socket_map.items():
-            if hasattr(v, 'addr'):
-                # see Zope/lib/python/App/ApplicationManager.py: def getServers(self)
-                type = str(getattr(v, '__class__', 'unknown'))
-                if type == 'ZServer.HTTPServer.zhttp_server':
-                    ip, port = v.addr
-                    break
+        try:
+            zopewsgi = sys.modules['Products.ERP5.bin.zopewsgi']
+        except KeyError:
+            from asyncore import socket_map
+            for k, v in socket_map.items():
+                if hasattr(v, 'addr'):
+                    # see Zope/lib/python/App/ApplicationManager.py: def getServers(self)
+                    type = str(getattr(v, '__class__', 'unknown'))
+                    if type == 'ZServer.HTTPServer.zhttp_server':
+                        ip, port = v.addr
+                        break
+        else:
+            ip, port = zopewsgi.server.addr
         if ip == '0.0.0.0':
             ip = socket.gethostbyname(socket.gethostname())
         _server_address = '%s:%s' %(ip, port)
@@ -1464,7 +1464,7 @@ class ActivityTool (BaseTool):
     def invoke(self, message):
       if self.activity_tracking:
         activity_tracking_logger.info('invoking message: object_path=%s, method_id=%s, args=%r, kw=%r, activity_kw=%r, user_name=%s' % ('/'.join(message.object_path), message.method_id, message.args, message.kw, message.activity_kw, message.user_name))
-      old_localizer_context = False
+      old_request = None
       if getattr(self, 'aq_chain', None) is not None:
         # Grab existing acquisition chain and extrach base objects.
         base_chain = [aq_base(x) for x in self.aq_chain]
@@ -1500,16 +1500,8 @@ class ActivityTool (BaseTool):
           new_request.other['VirtualRootPhysicalPath'] = request_info['VirtualRootPhysicalPath']
         if 'HTTP_ACCEPT_LANGUAGE' in request_info:
           new_request.environ['HTTP_ACCEPT_LANGUAGE'] = request_info['HTTP_ACCEPT_LANGUAGE']
-          # Replace Localizer/iHotfix Context, saving existing one
-          localizer_context = LocalizerContext(new_request)
-          id = get_ident()
-          localizer_lock.acquire()
-          try:
-            old_localizer_context = localizer_contexts.get(id)
-            localizer_contexts[id] = localizer_context
-          finally:
-            localizer_lock.release()
-          # Execute Localizer/iHotfix "patch 2"
+          old_request = getRequest()
+          setRequest(new_request)
           new_request.processInputs()
 
         new_request_container = request_container.__class__(REQUEST=new_request)
@@ -1528,17 +1520,7 @@ class ActivityTool (BaseTool):
           # Restore default skin selection
           skinnable = self.getPortalObject()
           skinnable.changeSkin(skinnable.getSkinNameFromRequest(request))
-        if old_localizer_context is not False:
-          # Restore Localizer/iHotfix context
-          id = get_ident()
-          localizer_lock.acquire()
-          try:
-            if old_localizer_context is None:
-              del localizer_contexts[id]
-            else:
-              localizer_contexts[id] = old_localizer_context
-          finally:
-            localizer_lock.release()
+        setRequest(old_request)
       if self.activity_tracking:
         activity_tracking_logger.info('invoked message')
       if my_self is not self: # We rewrapped self

product/ERP5/bin/zopewsgi.py

+import argparse
+from io import BytesIO
+import logging
+import os
+import posixpath
+import socket
+from tempfile import TemporaryFile
+import time
+from urllib import quote
+
+from waitress.server import create_server
+import ZConfig
+import Zope2
+from Zope2.Startup.run import make_wsgi_app
+
+from Products.ERP5Type.patches.WSGIPublisher import publish_module
+
+
+# this class licensed under the MIT license (stolen from pyramid_translogger)
+class TransLogger(object):
+
+    format = ('%(REMOTE_ADDR)s - %(REMOTE_USER)s [%(time)s] '
+              '"%(REQUEST_METHOD)s %(REQUEST_URI)s %(HTTP_VERSION)s" '
+              '%(status)s %(bytes)s "%(HTTP_REFERER)s" "%(HTTP_USER_AGENT)s"')
+
+    def __init__(self, application, logger):
+        self.application = application
+        self.logger = logger
+
+    def __call__(self, environ, start_response):
+        start = time.localtime()
+        req_uri = quote(environ.get('SCRIPT_NAME', '')
+                               + environ.get('PATH_INFO', ''))
+        if environ.get('QUERY_STRING'):
+            req_uri += '?'+environ['QUERY_STRING']
+        method = environ['REQUEST_METHOD']
+        def replacement_start_response(status, headers, exc_info=None):
+            # @@: Ideally we would count the bytes going by if no
+            # content-length header was provided; but that does add
+            # some overhead, so at least for now we'll be lazy.
+            bytes = None
+            for name, value in headers:
+                if name.lower() == 'content-length':
+                    bytes = value
+            self.write_log(environ, method, req_uri, start, status, bytes)
+            return start_response(status, headers)
+        return self.application(environ, replacement_start_response)
+
+    def write_log(self, environ, method, req_uri, start, status, bytes):
+        if bytes is None:
+            bytes = '-'
+        if time.daylight:
+                offset = time.altzone / 60 / 60 * -100
+        else:
+                offset = time.timezone / 60 / 60 * -100
+        if offset >= 0:
+                offset = "+%0.4d" % (offset)
+        elif offset < 0:
+                offset = "%0.4d" % (offset)
+        d = {
+            'REMOTE_ADDR': environ.get('REMOTE_ADDR') or '-',
+            'REMOTE_USER': environ.get('REMOTE_USER') or '-',
+            'REQUEST_METHOD': method,
+            'REQUEST_URI': req_uri,
+            'HTTP_VERSION': environ.get('SERVER_PROTOCOL'),
+            'time': time.strftime('%d/%b/%Y:%H:%M:%S ', start) + offset,
+            'status': status.split(None, 1)[0],
+            'bytes': bytes,
+            'HTTP_REFERER': environ.get('HTTP_REFERER', '-'),
+            'HTTP_USER_AGENT': environ.get('HTTP_USER_AGENT', '-'),
+            }
+        message = self.format % d
+        self.logger.warn(message)
+
+
+def app_wrapper(large_file_threshold, use_webdav):
+    try:
+        from product.DeadlockDebugger.dumper import dump_threads, dump_url
+    except Exception:
+        dump_url = '\0'
+    def app(environ, start_response):
+        path_info = environ['PATH_INFO']
+        if dump_url.startswith(path_info):
+            query_string = environ['QUERY_STRING']
+            if dump_url == (path_info + '?' + query_string if query_string
+                            else path_info):
+                start_response('200 OK', (('Content-type', 'text/plain'),))
+                return [dump_threads()]
+
+        original_wsgi_input = environ['wsgi.input']
+        if not hasattr(original_wsgi_input, 'seek'):
+            # Convert environ['wsgi.input'] to a file-like object.
+            cl = environ.get('CONTENT_LENGTH')
+            cl = int(cl) if cl else 0
+            if cl > large_file_threshold:
+                new_wsgi_input = environ['wsgi.input'] = TemporaryFile('w+b')
+            else:
+                new_wsgi_input = environ['wsgi.input'] = BytesIO()
+
+            rest = cl
+            chunksize = 1<<20
+            try:
+                while chunksize < rest:
+                    new_wsgi_input.write(original_wsgi_input.read(chunksize))
+                    rest -= chunksize
+                if rest:
+                    new_wsgi_input.write(original_wsgi_input.read(rest))
+            except (socket.error, IOError):
+                msg = b'Not enough data in request or socket error'
+                start_response('400 Bad Request', [
+                    ('Content-Type', 'text/plain'),
+                    ('Content-Length', str(len(msg))),
+                    ]
+                )
+                return [msg]
+            new_wsgi_input.seek(0)
+
+        if use_webdav:
+            # Munge the request to ensure that we call manage_FTPGet.
+
+            # Set a flag to indicate this request came through the WebDAV source
+            # port server.
+            environ['WEBDAV_SOURCE_PORT'] = 1
+
+            if environ['REQUEST_METHOD'] == 'GET':
+                if os.sep != '/':
+                    path_info =  path_info.replace(os.sep, '/')
+                path_info = posixpath.join(path_info, 'manage_DAVget')
+                path_info = posixpath.normpath(path_info)
+                environ['PATH_INFO'] = path_info
+
+        return publish_module(environ, start_response)
+    return app
+
+
+def runwsgi():
+    global server
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-w', '--webdav', action='store_true')
+    parser.add_argument('address', help='<ip>:<port>')
+    parser.add_argument('zope_conf', help='path to zope.conf')
+    args = parser.parse_args()
+
+    startup = os.path.dirname(Zope2.Startup.__file__)
+    schema = ZConfig.loadSchema(os.path.join(startup, 'zopeschema.xml'))
+    conf, _ = ZConfig.loadConfig(schema, args.zope_conf)
+
+    make_wsgi_app({}, zope_conf=args.zope_conf)
+
+    server = create_server(
+        TransLogger(app_wrapper(conf.large_file_threshold, args.webdav),
+                    logger=logging.getLogger("access")),
+        listen=args.address,
+        threads=conf.zserver_threads,
+        trusted_proxy='*',
+        trusted_proxy_headers=('x-forwarded-for',),
+        clear_untrusted_proxy_headers=True,
+    )
+    server.run()

product/ERP5Type/Globals.py

@@ -38,19 +38,7 @@ from App.class_init import default__class_init__, ApplicationDefaultPermissions
 # Nicer alias for class initializer.
 InitializeClass = default__class_init__
 
-##########################################
-# Localizer is not always loaded prior to ERP5 products,
-# thus, as Localizer is supposed to patch Global to add get_request to it,
-# we prefer to redefine get_request inside ERP5Type/Utils,
-# to avoid the case when Global wasn't patched and get_request is not available.
-# This is specially important on Zope 2.12 where Globals doesn't even exist.
-##########################################
-try:
-    import Products.iHotfix
-    get_request = Products.iHotfix.get_request
-except (ImportError, AttributeError):
-    import Products.Localizer
-    get_request = Products.Localizer.get_request
+from zope.globalrequest import getRequest as get_request
 
 # Persistency stuff also hasn't moved much from Zope 2.8, although the old
 # "Persistence" module remains there for ancient backward compatibility.

product/ERP5Type/ZopePatch.py

@@ -21,6 +21,7 @@
 ##############################################################################
 
 # Load all monkey patches
+from Products.ERP5Type.patches import WSGIPublisher
 from Products.ERP5Type.patches import HTTPRequest
 from Products.ERP5Type.patches import AccessControl_patch
 from Products.ERP5Type.patches import Restricted

product/ERP5Type/__init__.py

@@ -30,7 +30,7 @@
     ERP5Type is provides a RAD environment for Zope / CMF
     All ERP5 classes derive from ERP5Type
 """
-from patches import python, pylint
+from patches import python, pylint, globalrequest
 from zLOG import LOG, INFO
 DISPLAY_BOOT_PROCESS = False
 

product/ERP5Type/patches/globalrequest.py

+try:
+  import zope.globalrequest
+except ImportError:
+  import sys
+  sys.modules['zope.globalrequest'] = sys.modules[__name__]
+
+  from threading import local
+  localData = local()
+
+  def getRequest():
+    return getattr(localData, 'request', None)
+
+  def setRequest(request):
+    localData.request = request
+
+  def clearRequest():
+    setRequest(None)

product/ERP5Type/tests/ERP5TypeLiveTestCase.py

@@ -31,7 +31,6 @@ import os
 import sys
 import imp
 import re
-import thread
 
 from Testing import ZopeTestCase
 from Testing.ZopeTestCase import PortalTestCase, user_name
@@ -97,10 +96,9 @@ class ERP5TypeLiveTestCase(ERP5TypeTestCaseMixin):
         registry._conns[-1] = portal
 
       # This is for Localizer patch
-      from Products.Localizer import patches
+      from zope.globalrequest import setRequest
       request = portal.REQUEST
-      with patches._requests_lock:
-        patches._requests[thread.get_ident()] = request
+      setRequest(request)
 
       # Make live tests run under the same server URL than the host instance.
       if _request_server_url:

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -725,7 +725,7 @@ class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
         '''Publishes the object at 'path' returning a response object.'''
 
         from ZPublisher.Response import Response
-        from ZPublisher.Test import publish_module
+        from ZPublisher.Publish import publish_module_standard
 
         from AccessControl.SecurityManagement import getSecurityManager
         from AccessControl.SecurityManagement import setSecurityManager
@@ -738,8 +738,6 @@ class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
 
         if env is None:
             env = {}
-        if extra is None:
-            extra = {}
 
         request = self.app.REQUEST
 
@@ -780,11 +778,20 @@ class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
         try:
           if user:
             PAS._extractUserIds = _extractUserIds
-          publish_module('Zope2',
+
+          # The following `HTTPRequest` object would be created anyway inside
+          # `publish_module_standard` if no `request` argument was given.
+          request = request.__class__(stdin, env, response)
+          # However, we need to inject the content of `extra` inside the
+          # request.
+          if extra:
+            for k, v in extra.items(): request[k] = v
+
+          publish_module_standard('Zope2',
+                         request=request,
                          response=response,
                          stdin=stdin,
                          environ=env,
-                         extra=extra,
                          debug=not handle_errors,
                         )
         finally:

product/Localizer/patches.py

@@ -21,7 +21,6 @@ This is a hotfix, it dynamically applies several patches to Zope.
 # Import from the Standard Library
 import logging
 import os
-from thread import allocate_lock, get_ident
 
 # Import from itools
 from .itools.i18n import AcceptLanguageType
@@ -30,7 +29,8 @@ from .itools.i18n import AcceptLanguageType
 import Globals
 from ZPublisher import Publish
 from ZPublisher.HTTPRequest import HTTPRequest
-
+from zope.globalrequest import clearRequest, setRequest
+from zope.globalrequest import getRequest as get_request
 
 # Flag
 patch = False
@@ -57,56 +57,21 @@ logger = logging.getLogger('Localizer')
 # Also, we keep the get_request method in the Globals module for backwards
 # compatibility (with TranslationService for example).
 
-_requests = {}
-_requests_lock = allocate_lock()
-
-
-def get_request():
-    """Get a request object"""
-    return _requests.get(get_ident(), None)
-
-
-def new_publish(request, module_name, after_list, debug=0,
-                zope_publish=Publish.publish):
-    # Get the process id
-    ident = get_ident()
-
-    # Add the request object to the global dictionnary
-    _requests_lock.acquire()
-    try:
-        _requests[ident] = request
-    finally:
-        _requests_lock.release()
-
-    # Call the old publish
-    try:
-        # Publish
-        x = zope_publish(request, module_name, after_list, debug)
-    finally:
-        # Remove the request object.
-        # When conflicts occur the "publish" method is called again,
-        # recursively. In this situation the "_requests dictionary would
-        # be cleaned in the innermost call, hence outer calls find the
-        # request does not exist anymore. For this reason we check first
-        # wether the request is there or not.
-        if ident in _requests:
-            _requests_lock.acquire()
-            try:
-                del _requests[ident]
-            finally:
-                _requests_lock.release()
-
-    return x
+def get_new_publish(zope_publish):
+    def publish(request, *args, **kwargs):
+        try:
+            setRequest(request)
+            return zope_publish(request, *args, **kwargs)
+        finally:
+            clearRequest()
+    return publish
 
 
 if patch is False:
     logger.info('Install "Globals.get_request".')
 
     # Apply the patch
-    Publish.publish = new_publish
-
-    # First import (it's not a refresh operation).
-    # We need to apply the patches.
+    Publish.publish = get_new_publish(Publish.publish)
     patch = True
 
     # Add to Globals for backwards compatibility

product/TimerService/timerserver/timerserver/TimerServer.py → product/TimerService/timerserver/TimerServer.py

@@ -8,10 +8,10 @@ import traceback
 import thread
 import re
 import sys, os, errno, time, socket
+from functools import partial
 from StringIO import StringIO
 from zLOG import LOG, INFO
 
-from ZServer.PubCore import handle
 from ZPublisher.BaseRequest import BaseRequest
 from ZPublisher.BaseResponse import BaseResponse
 from ZPublisher.HTTPRequest import HTTPRequest
@@ -38,21 +38,46 @@ class TimerServer:
             '\tInterval: %s seconds.\n'%(time.ctime(time.time()), interval))
 
     def run(self):
-        # wait until the zhttp_server exist in socket_map
-        # because TimerService has to be started after the Zope HTTPServer
-        from asyncore import socket_map
-        ip = port = ''
-        while 1:
-            time.sleep(5)
-            for k, v in socket_map.items():
-                if hasattr(v, 'addr'):
+        try:
+            zopewsgi = sys.modules['Products.ERP5.bin.zopewsgi']
+        except KeyError:
+            # wait until the zhttp_server exist in socket_map
+            # because TimerService has to be started after the Zope HTTPServer
+            from asyncore import socket_map
+            ip = port = ''
+            while 1:
+                time.sleep(5)
+                for k, v in socket_map.items():
+                    if hasattr(v, 'addr'):
                         # see Zope/lib/python/App/ApplicationManager.py: def getServers(self)
                         type = str(getattr(v, '__class__', 'unknown'))
                         if type == 'ZServer.HTTPServer.zhttp_server':
                             ip, port = v.addr
                             break
-            if port:
-                break
+                if port:
+                    break
+            from ZServer.PubCore import handle
+        else:
+            while 1:
+                time.sleep(5)
+                try:
+                    server = zopewsgi.server
+                    break
+                except AttributeError:
+                    pass
+
+            ip, port = server.addr
+            start_response = lambda *_: None
+
+            class handle(object):
+                def __init__(self, module_name, request, response):
+                    self.service = partial(zopewsgi.publish_module,
+                        request.environ,
+                        start_response,
+                        _module_name=module_name,
+                        _request=request,
+                        _response=response)
+                    server.add_task(self)
 
         if ip == '0.0.0.0':
           ip = socket.gethostbyname(socket.gethostname())
@@ -99,6 +124,9 @@ class TimerServer:
 
 
 class TimerResponse(BaseResponse):
+
+    after_list = ()
+
     def _finish(self):
         pass
 
@@ -108,6 +136,9 @@ class TimerResponse(BaseResponse):
     def _unauthorized(self):
         pass
 
+    def finalize(self):
+        return None, None
+
     # This is taken from ZPublisher.HTTPResponse
     # I don't think it's safe to make TimerResponse a subclass of HTTPResponse,
     # so I inline here the method . This is required it you want unicode page
@@ -148,6 +179,7 @@ class TimerRequest(HTTPRequest):
         env['SERVER_PORT'] = ''
         env['REMOTE_ADDR'] = ''
         env['GATEWAY_INTERFACE'] = 'CGI/1.1'
+        env['SERVER_PROTOCOL'] = 'HTTP/1.0'
 
         env['PATH_INFO']= '/Control_Panel/timer_service/process_timer'
         return env

product/TimerService/timerserver/setup.py

-#!/usr/bin/env python
-try:
-  from setuptools import setup
-except ImportError:
-  from distutils.core import setup
-
-setup(name='timerserver',
-      version='2.0.4',
-      license='GPL',
-      description='Timer Server for Zope',
-      long_description='',
-      author='Nikolay Kim',
-      author_email='fafhrd@legco.biz',
-      packages=['timerserver'],
-      zip_safe=False,
-      package_data={'timerserver': ['component.xml']},
-    )