[jira] [Resolved] (AVRO-748) Python library does not include the implicit 'string' error type for messages

["Michael A. Smith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael A. Smith resolved AVRO-748.
-----------------------------------
    Fix Version/s: 1.10.0
       Resolution: Fixed

> Python library does not include the implicit 'string' error type for messages
> -----------------------------------------------------------------------------
>
>                 Key: AVRO-748
>                 URL: https://issues.apache.org/jira/browse/AVRO-748
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: python
>    Affects Versions: 1.4.1
>         Environment: Ubuntu, Python 2.6.6
>            Reporter: Christopher Armstrong
>            Assignee: Michael A. Smith
>            Priority: Major
>             Fix For: 1.10.0
>
>
> Here's a trivial test case:
> {code:python}
> schema = """
> {
>   "namespace": "test",
>   "protocol": "test",
>   "types": [],
>   "messages": {"test_method": {
>                "request": [],
>                "response": "string"}}
> }
> """
> from avro.protocol import parse
> protocol = parse(schema)
> assert protocol.messages['test_method'].errors is not None
> {code}
> This may be a bit white-box; the problem actually manifests in avro.ipc.Responder.respond (line 338), when making a call to write_error with the "writers_schema" being "local_message.errors". local_message.errors is None, and it blows up while validating the schema.
> This only seems to happen when there is *no* errors field in the message; if an errors field is provided, it still doesn't explicitly include "string" in the "errors" field, but it does seem to allow the error message to be passed back. So maybe this is an error in the protocol parser, or maybe it's an error in the code that actually tries to write the error response.



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