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https://issues.apache.org/jira/browse/PROTON-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157292#comment-17157292
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ASF GitHub Bot commented on PROTON-2244:
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gemmellr commented on pull request #263:
URL: https://github.com/apache/qpid-proton/pull/263#issuecomment-658125577
@kpvdr Yes, the comment applies to codec tests in general. It wouldn't
surprise me if other existing test dont do it, though for me that definitely
isnt reason not to do it here. More the reverse; we might not have hit some
previous issues if they did, and array encodings are more complicated than most
and so more likely to be broken. As they currently were, and could easily be
again in other ways.
If the arrays are still using the non-list0 encoding for empty lists thats
fine, I didn't look at the code enough to see what it actually did, I just
think having the test of whatever its expected to be doing makes sense.
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> [Proton-c] Encoder error for array of lists where first list in array is empty
> ------------------------------------------------------------------------------
>
> Key: PROTON-2244
> URL: https://issues.apache.org/jira/browse/PROTON-2244
> Project: Qpid Proton
> Issue Type: Task
> Components: proton-c
> Reporter: Kim van der Riet
> Priority: Major
>
> AMQP encodes arrays with a single element constructor which should be
> identical for all elements in the array. However, if an array of lists is
> constructed in which the first list is empty, then the AMQP empty list
> constructor is used in the array, and the following lists which may be
> non-empty, will not be decoded correctly.
> {noformat}
> >>> import proton
> >>> a = proton.Array(proton.UNDESCRIBED, proton.Data.LIST, [], [1,2,3],
> >>> ['aaa', 'bbb', 'ccc'])
> >>> d1 = proton.Data()
> >>> d1.put_py_array(a)
> >>> d1.encode().hex()
> 'f00000002a00000003450000000a000000035501550255030000001300000003a103616161a103626262a103636363'
> {noformat}
> which, when broken down into parts, looks as follows:
> {noformat}
> f0 000002a 00000003 45 <-- Array constructor, size=0x2a, len=3, type=empty
> list
> ^^--- Empty list constructor
> 0000000a 00000003 5501 5502 5503 <- data for [1,2,3]
> 00000013 00000003 a103616161 a103626262 a103636363 <-- data for ['aaa',
> 'bbb', 'ccc']
> {noformat}
> When decoded, this is being interpreted as an array of empty lists:
> {noformat}
> >>> d2 = proton.Data()
> >>> d2.decode(d1.encode())
> 10
> >>> d2.get_py_array()
> Array(UNDESCRIBED, 24, [], [], [])
> {noformat}
> When a mis-encoded array is used in the body of a message and is decoded, an
> error results:
> {noformat}
> >>> import proton
> >>> a = proton.Array(proton.UNDESCRIBED, proton.Data.LIST, [], [1,2,3],
> >>> ['aaa', 'bbb', 'ccc'])
> >>> m1 = proton.Message(body=a)
> >>> m1
> Message(priority=4, body=Array(UNDESCRIBED, 24, [], [1, 2, 3], ['aaa', 'bbb',
> 'ccc']))
> >>> m2 = proton.Message()
> >>> m2.decode(m1.encode())
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File
> "/home/kvdr/RedHat/install/lib64/proton/bindings/python3/proton/_message.py",
> line 488, in decode
> self._check(pn_message_decode(self._msg, data))
> File
> "/home/kvdr/RedHat/install/lib64/proton/bindings/python3/proton/_message.py",
> line 87, in _check
> raise exc("[%s]: %s" % (err, pn_error_text(pn_message_error(self._msg))))
> proton._exceptions.MessageException: [-6]: data error: (null)
> {noformat}
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