tests/hgweberror.py
author Gregory Szorc <gregory.szorc@gmail.com>
Tue, 13 Oct 2015 11:45:30 -0700
changeset 26644 74de1c59f71c
parent 23409 dc4d2cd3aa3e
child 27299 74e6de99ce7f
permissions -rw-r--r--
clonebundles: filter on bundle specification Not all clients are capable of reading every bundle. Currently, content negotiation to ensure a server sends a client a compatible bundle format is performed at request time. The response bundle is dynamically generated at request time, so this works fine. Clone bundles are statically generated *before* the request. This means that a modern server could produce bundles that a legacy client isn't capable of reading. Without some kind of "type hint" in the clone bundles manifest, a client may attempt to download an incompatible bundle. Furthermore, a client may not realize a bundle is incompatible until it has processed part of the bundle (imagine consuming a 1 GB changegroup bundle2 part only to discover the bundle2 part afterwards is incompatibl). This would waste time and resources. And it isn't very user friendly. Clone bundle manifests thus need to advertise the *exact* format of the hosted bundles so clients may filter out entries that they don't know how to read. This patch introduces that mechanism. We introduce the BUNDLESPEC attribute to declare the "bundle specification" of the entry. Bundle specifications are parsed using exchange.parsebundlespecification, which uses the same strings as the "--type" argument to `hg bundle`. The supported bundle specifications are well defined and backwards compatible. When a client encounters a BUNDLESPEC that is invalid or unsupported, it silently ignores the entry.
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# A dummy extension that installs an hgweb command that throws an Exception.
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from mercurial.hgweb import webcommands
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def raiseerror(web, req, tmpl):
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    '''Dummy web command that raises an uncaught Exception.'''
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    # Simulate an error after partial response.
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    if 'partialresponse' in req.form:
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        req.respond(200, 'text/plain')
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        req.write('partial content\n')
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    raise AttributeError('I am an uncaught error!')
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def extsetup(ui):
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    setattr(webcommands, 'raiseerror', raiseerror)
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    webcommands.__all__.append('raiseerror')