Mailing List Archive: C bindings : xen_session_login_with

C bindings : xen_session_login_with_password

May 30, 2007, 8:02 AM

Post #1 of 3 (936 views)

Hi,
I had few questions regarding the function the client should provide
to "Query the server and return the response" i.e. The client function
passed in call to xen_session_login_with_password()
session->call_func = call_func;
I see that the xen calls do pass data(input) in the XML-format while
calling this client function.

My questions are -
1) How should I use that data ? (as its already in XML format).
I can't pass it as it is to server, nor I can use xmlrpc_client_call on
it, hence was wondering, the intention ?

2) Where should I store the result (so that XenCaller can read it). I
guess, on success I should be returning a NULL value, as the return is
stored in "error", followed by calls "if (error)".

3) In which format does that api expect the result data ? (same XML
format or should I make use of xmlrpc calls to take out the value from
the response).

4) If one knows the link/doc I should have read, then please let me know.

Regards,
-harsh

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Re: C bindings : xen_session_login_with_password [ In reply to ]

jfehlig at novell

Jun 1, 2007, 10:44 AM

Post #2 of 3 (948 views)

Permalink

Harsh Modawel wrote:
> Hi,
> I had few questions regarding the function the client should
> provide to "Query the server and return the response" i.e. The client
> function passed in call to xen_session_login_with_password()
> session->call_func = call_func;
> I see that the xen calls do pass data(input) in the XML-format while
> calling this client function.
>
> My questions are -
> 1) How should I use that data ? (as its already in XML format).
> I can't pass it as it is to server, nor I can use xmlrpc_client_call
> on it, hence was wondering, the intention ?

That data is ready to be passed to the server. Just put it as payload
in some transport and send it along. See
tools/libxen/test/test_bindings.c. Also FYI, here is example
(simplified) from xen cim providers

static int call_func(const void *data, size_t len, void *user_handle,
void *result_handle, xen_result_func result_func)
{
xen_utils_session *s = (xen_utils_session *)user_handle;
char *read_buf = NULL;
int ccode = 0;

/* Send data to xend xmlrpc server. */
if (!xen_utils_xend_post(s->socket, (char *)data, len))
return -1;

/* Read response from xend. */
ccode = xen_utils_xend_read(s->socket, &read_buf);

/* Check for errors and handle appropriately */

/* Call result_func to process response */
result_func(read_buf, strlen(read_buf), result_handle);

/* Free buffer containing result */
if (read_buf)
free(read_buf);
return ccode;
}

Regards,
Jim

>
> 2) Where should I store the result (so that XenCaller can read it). I
> guess, on success I should be returning a NULL value, as the return is
> stored in "error", followed by calls "if (error)".
>
> 3) In which format does that api expect the result data ? (same XML
> format or should I make use of xmlrpc calls to take out the value from
> the response).
>
> 4) If one knows the link/doc I should have read, then please let me know.
>
> Regards,
> -harsh
>
>
>
> _______________________________________________
> xen-api mailing list
> xen-api@lists.xensource.com
> http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-api

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Re: C bindings : xen_session_login_with_password [ In reply to ]

harsh.modawel at oracle

Jun 3, 2007, 10:35 PM

Post #3 of 3 (931 views)

Permalink

Thanks Jim,
I had a look at test_bindings code and that answered the doubts.

Regards,
-harsh

Jim Fehlig wrote:

>Harsh Modawel wrote:
>
>
>>Hi,
>> I had few questions regarding the function the client should
>>provide to "Query the server and return the response" i.e. The client
>>function passed in call to xen_session_login_with_password()
>>session->call_func = call_func;
>>I see that the xen calls do pass data(input) in the XML-format while
>>calling this client function.
>>
>>My questions are -
>>1) How should I use that data ? (as its already in XML format).
>>I can't pass it as it is to server, nor I can use xmlrpc_client_call
>>on it, hence was wondering, the intention ?
>>
>>
>
>That data is ready to be passed to the server. Just put it as payload
>in some transport and send it along. See
>tools/libxen/test/test_bindings.c. Also FYI, here is example
>(simplified) from xen cim providers
>
>static int call_func(const void *data, size_t len, void *user_handle,
> void *result_handle, xen_result_func result_func)
>{
> xen_utils_session *s = (xen_utils_session *)user_handle;
> char *read_buf = NULL;
> int ccode = 0;
>
> /* Send data to xend xmlrpc server. */
> if (!xen_utils_xend_post(s->socket, (char *)data, len))
> return -1;
>
> /* Read response from xend. */
> ccode = xen_utils_xend_read(s->socket, &read_buf);
>
> /* Check for errors and handle appropriately */
>
> /* Call result_func to process response */
> result_func(read_buf, strlen(read_buf), result_handle);
>
> /* Free buffer containing result */
> if (read_buf)
> free(read_buf);
> return ccode;
>}
>
>Regards,
>Jim
>
>
>
>>2) Where should I store the result (so that XenCaller can read it). I
>>guess, on success I should be returning a NULL value, as the return is
>>stored in "error", followed by calls "if (error)".
>>
>>3) In which format does that api expect the result data ? (same XML
>>format or should I make use of xmlrpc calls to take out the value from
>>the response).
>>
>>4) If one knows the link/doc I should have read, then please let me know.
>>
>>Regards,
>>-harsh
>>
>>
>>
>>_______________________________________________
>>xen-api mailing list
>>xen-api@lists.xensource.com
>>http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-api
>>
>>
>
>
>