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fix incorrect error messages for from_http() #143

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fix incorrect error messages for from_http() #143

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xinydev
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@xinydev xinydev commented Aug 24, 2021

Fixes #139

Align the logic of has_binary_headers() with sdk-go

Using ce-specversion is enough.

func NewMessage(header nethttp.Header, body io.ReadCloser) *Message {
	m := Message{Header: header}
	if body != nil {
		m.BodyReader = body
	}
	if m.format = format.Lookup(header.Get(ContentType)); m.format == nil {
		m.version = specs.Version(m.Header.Get(specs.PrefixedSpecVersionName()))
	}
	return &m
}

func (m *Message) ReadEncoding() binding.Encoding {
	if m.version != nil {
		return binding.EncodingBinary
	}
	if m.format != nil {
		return binding.EncodingStructured
	}
	return binding.EncodingUnknown
}

Changes

One line description for the changelog

  • Tests pass
  • Appropriate changes to README are included in PR

@di di requested a review from grant August 24, 2021 13:58
@cloudevents cloudevents deleted a comment from xinydev Aug 24, 2021
@GrahamCampbell
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This PR is missing tests covering the actual issue.

grant
grant suggested changes Sep 2, 2021
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Thanks for the PR.

The spec states that binary CEs have required attributes in the headers.

There are 4 required attributes:

https://github.com/cloudevents/spec/blob/v1.0/spec.md#required-attributes

I'm not seeing how this fixes an issue with the function.

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grant commented Sep 2, 2021

Align the logic of has_binary_headers() with sdk-go

The goal of the SDKs aren't to align to each other, but rather the CE spec. I'm a bit confused why this is mentioned here.

@GrahamCampbell
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I think the complaint here is that the error message when it fails to parse is not very helpful? By removing the extra conditions on trying to process the message as a binary encoding, we are able to provide a more helpful error about missing required attributes, rather than instead trying to process it as structured.

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Had there been a test included with this, this would have been clearer. :trollface: :P

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grant commented Sep 2, 2021

Making the error message better sounds good. However, I don't see this PR fixing #139, so I'm inclined we modify the PR or close it. :)

@xinydev xinydev force-pushed the fix-binary-error branch 2 times, most recently from 5c066c2 to c0ac91f Compare September 3, 2021 03:14
@xinydev
fix incorrect error messages for from_http()
9cbb539 
add tests

fix lint

Signed-off-by: XinYang <[email protected]>
@xinydev xinydev requested a review from grant September 3, 2021 03:21
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xinydev commented Sep 6, 2021

PTAL, I added a test case

I don't see this PR fixing

Before modification, all http requests with missing necessary headers will be judged as structured content mode(but in fact is binary mode),and than raise an error in L65-L67(Failed to find specversion in HTTP request)

After modification, the http requests with missing necessary headers will throw an error through L76-L78

sdk-python/cloudevents/http/http_methods.py

Lines 46 to 78 in 705e8b4

if is_binary(headers):
specversion = headers.get("ce-specversion", None)
else:
try:
raw_ce = json.loads(data)
except json.decoder.JSONDecodeError:
raise cloud_exceptions.MissingRequiredFields(
"Failed to read specversion from both headers and data. "
f"The following can not be parsed as json: {data}"
)
if hasattr(raw_ce, "get"):
specversion = raw_ce.get("specversion", None)
else:
raise cloud_exceptions.MissingRequiredFields(
"Failed to read specversion from both headers and data. "
f"The following deserialized data has no 'get' method: {raw_ce}"
)
if specversion is None:
raise cloud_exceptions.MissingRequiredFields(
"Failed to find specversion in HTTP request"
)
event_handler = _obj_by_version.get(specversion, None)
if event_handler is None:
raise cloud_exceptions.InvalidRequiredFields(
f"Found invalid specversion {specversion}"
)
event = marshall.FromRequest(
event_handler(), headers, data, data_unmarshaller=data_unmarshaller
)

grant
grant suggested changes Sep 17, 2021
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All of the 4 required CE fields should be check and required.

cloudevents/sdk/converters/util.py
and "ce-source" in headers
and "ce-type" in headers
and "ce-id" in headers
or "ce-source" in headers
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@grant grant Sep 17, 2021 •
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All of these headers are required for binary CEs.

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grant commented Sep 17, 2021

Perhaps come to CloudEvent WG to talk about the PR?

https://github.com/cloudevents/spec#meeting-time

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grant commented Dec 10, 2021

Hi @xinydev, lmk if you're still working on this. I left some comments from before.

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xinydev commented Dec 10, 2021 •
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Hi @xinydev, lmk if you're still working on this. I left some comments from before.

I'm very sorry, I don't have enough time to continue doing this recently.

@xinydev xinydev closed this Dec 10, 2021
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cloudevents.http.from_http binary incorrect error messages
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@xinydev @GrahamCampbell @grant