Mercurial > p > roundup > code
annotate roundup/cgi/TAL/XMLParser.py @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | 14a61eabcea8 |
| children |
| rev | line source |
|---|---|
| 1049 | 1 ############################################################################## |
| 2 # | |
| 3 # Copyright (c) 2001, 2002 Zope Corporation and Contributors. | |
| 4 # All Rights Reserved. | |
|
2348
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
5 # |
| 1049 | 6 # This software is subject to the provisions of the Zope Public License, |
| 7 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. | |
| 8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED | |
| 9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS | |
| 11 # FOR A PARTICULAR PURPOSE | |
|
2348
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
12 # |
| 1049 | 13 ############################################################################## |
|
2348
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
14 # Modifications for Roundup: |
|
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
15 # 1. commented out zLOG references |
|
5402
88dbacd11cd1
Python 3 preparation: update urllib / urllib2 / urlparse imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
2348
diff
changeset
|
16 # 2. use roundup.anypy.urllib_ |
|
2348
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
17 """ |
|
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
18 Generic expat-based XML parser base class. |
|
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
19 """ |
|
1071
c08b3820edd1
Adhering to ZPL
Richard Jones <richard@users.sourceforge.net>
parents:
1049
diff
changeset
|
20 |
|
2348
8c2402a78bb0
beginning getting ZPT up to date: TAL first
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
changeset
|
21 #import zLOG |
| 1049 | 22 |
| 23 class XMLParser: | |
| 24 | |
| 25 ordered_attributes = 0 | |
| 26 | |
| 27 handler_names = [ | |
| 28 "StartElementHandler", | |
| 29 "EndElementHandler", | |
| 30 "ProcessingInstructionHandler", | |
| 31 "CharacterDataHandler", | |
| 32 "UnparsedEntityDeclHandler", | |
| 33 "NotationDeclHandler", | |
| 34 "StartNamespaceDeclHandler", | |
| 35 "EndNamespaceDeclHandler", | |
| 36 "CommentHandler", | |
| 37 "StartCdataSectionHandler", | |
| 38 "EndCdataSectionHandler", | |
| 39 "DefaultHandler", | |
| 40 "DefaultHandlerExpand", | |
| 41 "NotStandaloneHandler", | |
| 42 "ExternalEntityRefHandler", | |
| 43 "XmlDeclHandler", | |
| 44 "StartDoctypeDeclHandler", | |
| 45 "EndDoctypeDeclHandler", | |
| 46 "ElementDeclHandler", | |
| 47 "AttlistDeclHandler" | |
| 48 ] | |
| 49 | |
| 50 def __init__(self, encoding=None): | |
| 51 self.parser = p = self.createParser() | |
|
5519
14a61eabcea8
Fixed unicode issues for XML template with Python 2
Christof Meerwald <cmeerw@cmeerw.org>
parents:
5402
diff
changeset
|
52 # Make sure we don't get fed unicode strings in Python 2 as we |
|
14a61eabcea8
Fixed unicode issues for XML template with Python 2
Christof Meerwald <cmeerw@cmeerw.org>
parents:
5402
diff
changeset
|
53 # can't handle those |
|
14a61eabcea8
Fixed unicode issues for XML template with Python 2
Christof Meerwald <cmeerw@cmeerw.org>
parents:
5402
diff
changeset
|
54 if hasattr(self.parser, 'returns_unicode'): |
|
14a61eabcea8
Fixed unicode issues for XML template with Python 2
Christof Meerwald <cmeerw@cmeerw.org>
parents:
5402
diff
changeset
|
55 self.parser.returns_unicode = False |
| 1049 | 56 if self.ordered_attributes: |
| 57 try: | |
| 58 self.parser.ordered_attributes = self.ordered_attributes | |
| 59 except AttributeError: | |
| 60 #zLOG.LOG("TAL.XMLParser", zLOG.INFO, | |
| 61 # "Can't set ordered_attributes") | |
| 62 self.ordered_attributes = 0 | |
| 63 for name in self.handler_names: | |
| 64 method = getattr(self, name, None) | |
| 65 if method is not None: | |
| 66 try: | |
| 67 setattr(p, name, method) | |
| 68 except AttributeError: | |
| 69 #zLOG.LOG("TAL.XMLParser", zLOG.PROBLEM, | |
| 70 # "Can't set expat handler %s" % name) | |
| 71 pass | |
| 72 | |
| 73 def createParser(self, encoding=None): | |
| 74 global XMLParseError | |
| 75 try: | |
| 76 from Products.ParsedXML.Expat import pyexpat | |
| 77 XMLParseError = pyexpat.ExpatError | |
| 78 return pyexpat.ParserCreate(encoding, ' ') | |
| 79 except ImportError: | |
| 80 from xml.parsers import expat | |
| 81 XMLParseError = expat.ExpatError | |
| 82 return expat.ParserCreate(encoding, ' ') | |
| 83 | |
| 84 def parseFile(self, filename): | |
| 85 self.parseStream(open(filename)) | |
| 86 | |
| 87 def parseString(self, s): | |
| 88 self.parser.Parse(s, 1) | |
| 89 | |
| 90 def parseURL(self, url): | |
|
5402
88dbacd11cd1
Python 3 preparation: update urllib / urllib2 / urlparse imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
2348
diff
changeset
|
91 import roundup.anypy.urllib_ |
|
88dbacd11cd1
Python 3 preparation: update urllib / urllib2 / urlparse imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
2348
diff
changeset
|
92 self.parseStream(roundup.anypy.urllib_.urlopen(url)) |
| 1049 | 93 |
| 94 def parseStream(self, stream): | |
| 95 self.parser.ParseFile(stream) | |
| 96 | |
| 97 def parseFragment(self, s, end=0): | |
| 98 self.parser.Parse(s, end) |