Re: [go-nuts] Re: Golang Error - When marshelling data

[Konstantin Khomoutov]

On Fri, 17 Jun 2016 00:50:20 -0700 (PDT)
User123  wrote:

[...]
> When i return http response from a function should i use
> *func makeCalls() (string, error, *http.Response, error) *
> or
> *func makeCalls() (string, error, http.Response, error)  *
> 
> For the struct i created above what should be the type of header
> should it be **http.Header  or **http.Header ??*

Most of the code in the net/http package itself pass values of
net/http.Response by pointer, so I'd do the same.

On a side note, can I please ask you to refrain from using that lame
HTML formatting of the Google Groups interface?  In a plain mail reader
which quite many people use to read mailing list your message looks
something like [1].  As you could see, guessing which asterisk denotes
a pointer and which is a stupid Google Group's attempt at emphasising
is a bit cumbersome :-)

1. http://www.fastpic.info/image/9b5a0f4dcf

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[go-nuts] Re: Golang Error - When marshelling data

[User123]

Have found the cause of the issue

The message that I was trying to marshall had *0x10a3c2d0 (when 
fmt.Println)  *which was http response.

>From  https://github.com/revel/revel/issues/1037 i found that

*Since Go 1.6 http.Request struct contains `Cancel <-chan struct{}` which*
*results in `json: unsupported type: <-chan struct {}`*

So i created struct for httpRes instaed of using interface . 

*type HttpRespStruct struct {*
* Status string*
* StatusCode int*
* Proto string*
* Header http.Header *
* ContentLength int64*
* TransferEncoding []string*
*}*
and it fixed the issue.

One thing i wanted to ask

When i return http response from a function should i use
*func makeCalls() (string, error, *http.Response, error) *
or
*func makeCalls() (string, error, http.Response, error)  *

For the struct i created above what should be the type of header should it 
be **http.Header  or **http.Header ??*

Thank You.

On Thursday, June 16, 2016 at 3:14:00 PM UTC+5:30, User123 wrote:

> The data  I am trying to marshal contains serialized data. This data is 
> received in http response.
>
> It works perfectly when I try in version 1.4.1/ 1.4.2.
>
> But when I try this to the latest version 1.6 it gives an error: *json: 
> unsupported type: <-chan struct {}*
>
> Why is it so? 
>
> I am not able to upgrade to the latest version because of this.
>
> Please help!
>
>
>
>
>

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Re: [go-nuts] Re: Golang Error - When marshelling data

[Konstantin Khomoutov]

On Thu, 16 Jun 2016 04:55:41 -0700 (PDT)
User123  wrote:

> Is it giving error since it has null values? 
> 
> I'm just not able to get it. Since this code works perfectly fine in
> 1.4.2

A wild guess:

1) Your error message is:

 json: unsupported type: <-chan struct {}

   and indeed the docs of encoding/json clearly state that certain
   types cannot be sensibly marshalled and unmarshalled.
   Channel types are among them.

2) Some value contained as a field of your value -- which is supposedly
   of some custom struct type -- started to contain a variable of type

 <-chan struct{}

   somewhere between 1.4.2 and 1.6.

   This might be not an immediate field of your struct-typed value
   but a field of a value which is an immediate field, and so on --
   deeper down the hierarchy -- because the json encoder is recursive.

Hence inspect what your value might clinge on which is not *pure data.*
Say, an http.Client instance is not pure data.

Once identified, make sure you convert your existing value you're
encoding to a value of some other type which contains nothing but pure
data values.

[...]
> > I did fmt.println on the data that I am trying to marshall and it
> > looks like this
> >
> > *%!(EXTRA main.JobResponseRoot={{92b4f95b309e8db0f8d56afadefc}
> > http.res {[{{  map[] }
> > "Date","Time","Time_Zone","Source","Name","Raw_Data"*
> > *  0x10a3c2d0}]}})*
[...]
> >>> The data  I am trying to marshal contains serialized data. This
> >>> data is received in http response.
> >>>
> >>> It works perfectly when I try in version 1.4.1/ 1.4.2.
> >>>
> >>> But when I try this to the latest version 1.6 it gives an error:
> >>> *json: unsupported type: <-chan struct {}*
[...]

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[go-nuts] Re: Golang Error - When marshelling data

[User123]

Is it giving error since it has null values? 

I'm just not able to get it. Since this code works perfectly fine in 1.4.2

On Thursday, June 16, 2016 at 4:08:38 PM UTC+5:30, User123 wrote:
>
> I cannot provide the full code sincethere are some dependencies.
>
> I did fmt.println on the data that I am trying to marshall and it looks 
> like this
>
> *%!(EXTRA main.JobResponseRoot={{92b4f95b309e8db0f8d56afadefc} http.res 
> {[{{  map[] } "Date","Time","Time_Zone","Source","Name","Raw_Data"*
> *  0x10a3c2d0}]}})*
>
> On Thursday, June 16, 2016 at 3:21:48 PM UTC+5:30, Dave Cheney wrote:
>>
>> Hello,
>>
>> Can you please provide a runnable code sample that shows the problem.
>>
>> Thanks
>>
>> Dave
>>
>> On Thursday, 16 June 2016 19:44:00 UTC+10, User123 wrote:
>>>
>>> The data  I am trying to marshal contains serialized data. This data is 
>>> received in http response.
>>>
>>> It works perfectly when I try in version 1.4.1/ 1.4.2.
>>>
>>> But when I try this to the latest version 1.6 it gives an error: *json: 
>>> unsupported type: <-chan struct {}*
>>>
>>> Why is it so? 
>>>
>>> I am not able to upgrade to the latest version because of this.
>>>
>>> Please help!
>>>
>>>
>>>
>>>
>>>

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