[Haskell-cafe] Strange encoding issue with Text and Servant

[David Turner]

Grasping at straws a little bit here, but can you (a) do a packet capture
(e.g. `tcpdump -X`) to see what's going back and forth on the wire, just to
make absolutely sure all of the oddness is on the client's end?

A string like `!D(MISSING)` sorta looks like a decoding error so perhaps it
will be instructive to look at the bytes on the wire it's trying to decode,
although I can't think what could be confused with an equals sign. It's not
like that blooming Greek question mark (
http://www.fileformat.info/info/unicode/char/037e/index.htm).

Cheers,




On 14 January 2017 at 18:47, Nigel Rantor <wiggly at wiggly.org> wrote:

> On 14/01/17 17:37, Jan von Löwenstein wrote:
>
>> Oh, it happens with servant on the client side.
>>
>> I use a swagger-codegen generated servant based client to access
>> kubernetes.
>> Calling https://github.com/soundcloud/haskell-kubernetes/blob/master
>> /lib/Kubernetes/Api/ApivApi.hs#L475 works
>> Calling https://github.com/soundcloud/haskell-kubernetes/blob/master
>> /lib/Kubernetes/Api/ApivApi.hs#L473 doesn't.
>>
>> From what I see the `QueryParam"labelSelector" Text`is the same in both.
>>
>> Logging the value gives the literal `=` as expected. Logging the
>> (http-client) requests shows the difference.
>>
>
> So I went ahead and wrote a simple client by hand and when I call the two
> functions on a local endpoint that shows me the request URL I get the
> following.
>
> Same arguments for 'pretty' and 'labelSelector' in both cases.
>
> Code:
>
> runListSecret :: Manager -> BaseUrl -> ClientM SecretList
>
> runListSecret manager baseUrl = listSecret (Just "prettyArg") (Just "=")
> Nothing Nothing Nothing Nothing manager baseUrl
>
>
>
> runListService :: Manager -> BaseUrl -> ClientM ServiceList
>
> runListService manager baseUrl = listService (Just "prettyArg") (Just "=")
> Nothing Nothing Nothing Nothing manager baseUrl
>
> Server log:
>
> 127.0.0.1 - - [14/Jan/2017:18:39:49 +0000] "GET
> /api/v1/secrets?pretty=prettyArg&labelSelector=%3D HTTP/1.1" 404 - 0.0003
> 127.0.0.1 - - [14/Jan/2017:18:39:49 +0000] "GET
> /api/v1/services?pretty=prettyArg&labelSelector=%3D HTTP/1.1" 404 - 0.0003
>
> I haven't used swagger-codegen but the servant-client code works for me so
> I would look more into that.
>
> Swagger codegen looks like it might take me a while to get my head into so
> maybe you could look at the generated code, or sling it to me here or
> directly.
>
> The two calls are so similar that I can't see why the generated client
> would behave differently in those cases.
>
> Regards,
>
>   n
>
> Best
>> Jan
>>
>> Nigel Rantor <wiggly at wiggly.org <mailto:wiggly at wiggly.org>> schrieb am
>>
>> Sa., 14. Jan. 2017 um 18:11 Uhr:
>>
>>     On 13/01/17 19:28, Jan von Löwenstein wrote:
>>     > Hi,
>>     >
>>     > I have got a two places with a `QueryParam "q" Text` and call it
>>     with a
>>     > Text that contains a `=` literal. In one place the `=` is correctly
>>     > encoded as %3D, in the other I see a `!D(MISSING)`.
>>     >
>>     > This has to happen somewhere in Servant or the lower layers. Both
>>     Texts
>>     > print out nicely with an `=` sign if I just print them to stdout.
>>     >
>>     > Google does not find `!D(MISSING)` anywhere.
>>     >
>>     > Any idea what could possibly be the problem here?
>>
>>     It would be really useful to see exactly how you are 'calling' this.
>>
>>     Do you have a curl command line or are you using some other client?
>>
>>        n
>>
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