Message Framing

Message Framing. More...

Functions
int	globus_gram_protocol_frame_request (const char *url, const globus_byte_t *msg, globus_size_t msgsize, globus_byte_t **framedmsg, globus_size_t *framedsize)
	Create a HTTP-framed copy of a GRAM request. More...
int	globus_gram_protocol_frame_reply (int code, const globus_byte_t *msg, globus_size_t msgsize, globus_byte_t **framedmsg, globus_size_t *framedsize)
	Create a HTTP-framed copy of a GRAM reply. More...

Detailed Description

Message Framing.

The functions in this section frame a GRAM request, query, or reply message with HTTP headers compatible with the GRAM2 protocol parsers in GT2 GT3, and GT4.

These functions should be used when an application wants to control the way that the GRAM Protocol messages are sent, while still using the standard message formatting and framing routines. An alternative set of functions in the Message I/O section of the manual combine message framing with callback-driven I/O.

Function Documentation

int globus_gram_protocol_frame_reply	(	int	code,
		const globus_byte_t *	msg,
		globus_size_t	msgsize,
		globus_byte_t **	framedmsg,
		globus_size_t *	framedsize
	)

Create a HTTP-framed copy of a GRAM reply.

The globus_gram_protocol_frame_reply() function adds HTTP 1.1 framing around the input message. The framed message includes HTTP headers relating the the status of the operation being replied to and the length of the message content. The framed message is returned by modifying framedmsg to point to a newly allocated string. The integer pointed to by the framedsize parameter is set to the length of this message.

Parameters

code	The HTTP response code to send along with this reply.
msg	A string containing the reply message content to be framed.
msgsize	The length of the string pointed to by msg.
framedmsg	An output parameter which will be set to a copy of the msg string with an HTTP reply frame around it.
framedsize	An output parameter which will be set to the length of the framed reply string pointed to by framedmsg.

Returns

Upon success, globus_gram_protocol_frame_reply() will return GLOBUS_SUCCESS and the framedmsg and framedsize parameters will be modified to point to the new framed message string and its length respectively. When this occurs, the caller is responsible for freeing the string pointed to by framedmsg. If an error occurs, its value will returned and the framedmsg and framedsize parameters will be uninitialized.

Return values

GLOBUS_SUCCESS

Success

int globus_gram_protocol_frame_request	(	const char *	url,
		const globus_byte_t *	msg,
		globus_size_t	msgsize,
		globus_byte_t **	framedmsg,
		globus_size_t *	framedsize
	)

Create a HTTP-framed copy of a GRAM request.

The globus_gram_protocol_frame_request() function adds HTTP 1.1 framing around the input message. The framed message includes HTTP headers relating the the destination URL and the length of the message content. The framed message is returned by modifying framedmsg to point to a newly allocated string. The integer pointed to by the framedsize parameter is set to the length of this message.

Parameters

url	The URL of the GRAM resource to contact. This is parsed and used to generate the HTTP POST operation destination and the Host HTTP header.
msg	A string containing the message content to be framed.
msgsize	The length of the string pointed to by msg
framedmsg	An output parameter which will be set to a copy of the msg string with an HTTP frame around it.
framedsize	An output parameter which will be set to the length of the framed message.

Returns

Upon success, globus_gram_protocol_frame_request() will return GLOBUS_SUCCESS and the framedmsg and framedsize parameters will be modified to point to the new framed message string and its length respectively. When this occurs, the caller is responsible for freeing the string pointed to by framedmsg. If an error occurs, its value will returned and the framedmsg and framedsize parameters will be uninitialized.

Return values

GLOBUS_SUCCESS	Success
GLOBUS_GRAM_PROTOCOL_ERROR_INVALID_JOB_CONTACT	Invalid job contact