plone.subrequest 2.0.0b1

Subrequests for Zope2

Overview

plone.subrequest provides a mechanism for issuing subrequests under Zope.

Installation

Plone 4+

This package is included by core Plone, so no special installation is required.

Zope

Load this package’s ZCML in the usual manner.

Usage

Basic usage

Call subrequest(url), it returns a response object.

>>> from plone.subrequest import subrequest
>>> response = subrequest('/folder1/@@url')
>>> response.getBody()
b'http://nohost/folder1'

response.getBody() also works for code that calls response.write(data). This one returns a text/non-byte value.

>>> response = subrequest('/@@response-write')
>>> response.getBody()
'Some data.\nSome more data.\n'

But in this case response.getBody() may only be called once.

>>> response.getBody()
Traceback (most recent call last):
    ...
ValueError: I/O operation on closed file

Accessing the response body as a file

Some code may call response.write(data).

>>> response = subrequest('/@@response-write')

In which case you may access response.stdout as file.

>>> response.stdout.seek(0, 0) or 0  # Py2 returns None, Py3 returns new position
0
>>> list(response.stdout)
['Some data.\n', 'Some more data.\n']

You can test whether a file was returned using response._wrote.

>>> response._wrote
1

When you’re done, close the file:

>>> response.stdout.close()

Use response.outputBody() to ensure the body may be accessed as a file.

>>> from plone.subrequest import subrequest
>>> response = subrequest('/folder1/@@url')
>>> response._wrote
>>> response.outputBody()
>>> response._wrote
1
>>> response.stdout.seek(0, 0) or 0  # Py2 returns None, Py3 returns new position
0
>>> list(response.stdout)
['http://nohost/folder1']

Relative paths

Relative paths are resolved relative to the parent request’s location:

>>> from plone.subrequest.tests import traverse
>>> request = traverse('/folder1/@@test')
>>> response = subrequest('folder1A/@@url')
>>> response.getBody()
b'http://nohost/folder1/folder1A'

This takes account of default view’s url.

>>> request = traverse('/folder1')
>>> request['URL'] == 'http://nohost/folder1/@@test'
True
>>> response = subrequest('folder1A/@@url')
>>> response.getBody()
b'http://nohost/folder1/folder1A'

Virtual hosting

When virtual hosting is used, absolute paths are traversed from the virtual host root.

>>> request = traverse('/VirtualHostBase/http/nohost:80/folder1/VirtualHostRoot/')
>>> response = subrequest('/folder1A/@@url')
>>> response.getBody()
b'http://nohost/folder1A'

Specifying the root

You may also set the root object explicitly

>>> app = layer['app']
>>> response = subrequest('/folder1A/@@url', root=app.folder1)
>>> response.getBody()
b'http://nohost/folder1/folder1A'

Error responses

Subrequests may not be found.

>>> response = subrequest('/not-found')
>>> response.status
404

Or might raise an error.

>>> response = subrequest('/@@error')
>>> response.status
500

Or might raise an error rendered by a custom error view.

>>> response = subrequest('/@@custom-error')
>>> response.status
500
>>> response.body
b'Custom exception occurred: A custom error'

So check for the expected status.

>>> response = subrequest('/')
>>> response.status == 200
True

Handling subrequests

The parent request is set as PARENT_REQUEST onto subrequests.

Subrequests also provide the plone.subrequest.interfaces.ISubRequest marker interface.

Changelog

2.0.0b1 (2022-09-07)

Breaking changes:

• Drop Python 2 support and update code style. [jensens] (#25)

1.9.3 (2020-09-26)

Bug fixes:

• Fixed deprecation warning for zope.site.hooks. [maurits] (#24)

1.9.2 (2020-04-22)

Bug fixes:

• Minor packaging updates. (#1)

1.9.1 (2019-04-29)

Bug fixes:

• fix regression bug which was breaking in Python 2.7 when tiles contain non-ascii characters [MrTango] (#22)

1.9.0 (2018-12-11)

Breaking changes:

• Remove five.globalrequest dependency. It has been deprecated upstream (on Zope 4). [gforcada]

1.8.6 (2018-09-23)

New features:

• Fix importsi without ZServer [pbauer]

Bug fixes:

• More Python 3 compatibility. [ale-rt, thet]

• Make test dependency on Archetypes optional. [davisagli]

1.8.5 (2018-01-30)

Bug fixes:

• Add Python 2 / 3 compatibility [pbauer]

1.8.4 (2017-09-06)

New features:

• Add support for Zope exception views when explicit exception handler is not defined [datakurre]

Bug fixes:

• Fix issue where the example unauthorized_exception_handler did not properly set response status code [datakurre]

1.8.3 (2017-08-30)

Bug fixes:

• Reverted “Remove vurl-parts from path”, which resulted in broken p.a.mosaic pages [thet]

1.8.2 (2017-07-20)

Bug fixes:

• Remove vurl-parts from path [awello]

1.8.1 (2017-06-28)

Bug fixes:

• Remove unittest2 dependency [kakshay21]

1.8 (2016-11-01)

New features:

• Provide an exception-handler for rewriting Unauthorized to 401’s. [jensens]

1.7.0 (2016-05-04)

New:

• Allow to pass a custom exception handler for the response. [jensens]

Fixes:

• When a subrequest modified the DB (or prior to the subrequest the main request), the oids annotated to the requests were doubled with each subsequent subrequest. This resulted in out-of-memory errors when using lots of subrequests, such as it happens on Mosaic based sites with a certain amount of tiles. Fixed by only adding new oids, not already known by parent request. [jensens]

• Housekeeping: isort imports, autopep8, minor manual cleanup (no zope.app. imports). [jensens]

1.6.11 (2015-09-07)

• propagate IDisableCSRFProtection interface on subrequest to parent request object [vangheem]

1.6.10 (2015-08-14)

• propagate registered safe writes from plone.protect to parent request object. [vangheem]

1.6.9 (2015-03-21)

• Workaround for broken test because of missing dependency declaration in upstream package, see https://github.com/plone/plone.app.blob/issues/19 for details. [jensens]

• Housekeeping and code cleanup (pep8, et al). [jensens]

• Fix issue where new cookies from the main request.response are not passed to subrequests. [datakurre]

• normalise request path_info so that string indexing works properly. [gweiss]

1.6.8 (2014-03-04)

• Handle sub-requests which contain a doubled // in the path. [gweis]

1.6.7 (2012-10-22)

• Ensure correct handling of bare virtual hosting urls. [elro]

1.6.6 (2012-06-29)

• Log errors that occur handling a subrequest to help debug plone.app.theming errors including content from a different url [anthonygerrard]

1.6.5 (2012-04-15)

• Ensure parent url is a string and not unicode. [davisagli]

1.6.4 - 2012-03-22

• Fix problems with double encoding some unicode charse by not copying too many other variables. [elro]

1.6.3 - 2012-02-12

• Copy other request variables such as LANGUAGE to subrequest. [elro]

1.6.2 - 2011-07-04

• Handle spaces in default documents. http://dev.plone.org/plone/ticket/12278

1.6.1 - 2011-07-04

• Move tests to package directory to making testing possible when installed normally.

1.6 - 2011-06-06

• Ensure url is a string and not unicode. [elro]

1.6b2 - 2011-05-20

• Set PARENT_REQUEST and add ISubRequest interface to subrequests. [elro]

1.6b1 - 2011-02-11

• Handle IStreamIterator. [elro]

• Simplify API so response.getBody() always works. [elro]

1.5 - 2010-11-26

• Merge cookies from subrequest response into parent response. [awello]

1.4 - 2010-11-10

• First processInput, then traverse (fixes #11254) [awello]

1.3 - 2010-08-24

• Fixed bug with virtual hosting and quoted paths. [elro]

1.2 - 2010-08-16

• Restore zope.component site after subrequest. [elro]

1.1 - 2010-08-14

• Virtual hosting, relative url and error response support. [elro]

1.0 - 2010-07-28

• Initial release. [elro]