table of contents
Protocol Modules(3) | globus_gass_transfer | Protocol Modules(3) |
NAME¶
Protocol Modules - Protocol Implementation API.Data Structures¶
struct globus_gass_transfer_request_proto_s
Typedefs¶
typedef struct
Functions¶
void globus_gass_transfer_proto_send_complete (globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t nbytes, globus_bool_t failed, globus_bool_t last_data)
Detailed Description¶
Protocol Implementation API. The GASS Protocol Module API is designed to make it possible to extend the GASS client and server APIs to support additional protocols without making any changes to the core of the GASS implementation. GASS protocol modules are intended to to handle protocol-specific connection and data handling. The GASS Transfer library includes protocol modules which implement the HTTP, HTTPS, FTP, and GSI-FTP protocols. Every protocol module implementation must include the following header file:#include "globus_gass_transfer_proto.h"To implement a protocol module, one must create a globus_gass_transfer_proto_descriptor_t structure which indicates what the protocol module is able to do. This structure contains the URL scheme which the protocol module supports, and function pointers which indicate what type of operations (client or server) that the module implements. To implement a client-side protocol module, the new_requestattr and new_request fields must be set to the protocol module's implementations of those functions. To implement a server-side protocol module, the new_listenerattr and new_listener functions must be set to the protocol module's implementations of those functions. A protocol module implementor registers a protocol module with the GASS Transfer library by calling the function globus_gass_transfer_proto_register_protocol(), and unregisters the module by calling globus_gass_transfer_proto_unregister_protocol(). This functions must be called after the GLOBUS_GASS_TRANSFER_MODULE has already been activated. Once registered, applications may use URLs of the scheme type provided by the protocol module for the standard client or server operations.
Typedef Documentation¶
typedef struct globus_gass_transfer_listener_proto_s globus_gass_transfer_listener_proto_t¶
Protocol module listener handling structure. See also:globus_gass_transfer_listener_proto_s
typedef void(* globus_gass_transfer_proto_accept_t)( globus_gass_transfer_listener_proto_t *proto, globus_gass_transfer_listener_t listener, globus_gass_transfer_request_t request, globus_gass_transfer_requestattr_t *attr)¶
Protocol module implementation function type for server request parsing. Function pointers of this type are associated with the globus_gass_transfer_listener_proto_t associated with a particular listener handle. They are called when a server implementation wants to accept a new connection from the listener. A new request is generated based on the protocol-specific request done on the new connection. The new request will be created with the attributes specified in the attr parameter. Once the protocol module has parsed the request, it must call globus_gass_transfer_proto_new_listener_request() to let the server implementation decide how to process this request. The protocol module should update the request to indicate the type of operation being requested, the size of the file (if applicable), and the identity of the client (if applicable). Parameters:proto The protocol specific listener data
structure associated with the listener handle.
listener The listener handle which the user requested the listen on.
request The new request handle.
attr The request attribute set to be used when processing this
request.
typedef int(* globus_gass_transfer_proto_create_listener_t)(globus_gass_transfer_listener_t listener, globus_gass_transfer_listenerattr_t *attr, char *scheme, char **base_url, globus_gass_transfer_listener_proto_t **proto)¶
Protocol module implementation function type for new server listeners. A function pointer of this type is associated with the globus_gass_transfer_proto_descriptor_t for a particular protocol module's implementation. It is called when the server has called globus_gass_transfer_create_listener(). Parameters:listener The listener handle to assocate with the
new proto created by the protocol module.
attr A protocol-specific attribute set, created by calling the protocol
module's new_listenerattr function pointer.
scheme The URL scheme that the server has requested for the new listener.
This will be one the scheme associated with a particular protocol module.
base_url A pointer to be set the value of the base url of this listener.
For most protocols, this will contain the scheme, hostname, and port number of
the listener. This string must be allocated using one of the memory allocators
defined in the globus_common library. It will be freed by the GASS Transfer
library when the listener is closed.
proto A pointer to be set to a new globus_gass_transfer_listener_proto_t
which will be associated with this listener. This must be allocated by the
protocol module using one of the memory allocators defined in the
globus_common library. It will be freed by the GASS Transfer library when the
listener is closed.
Returns:
A GASS error value, or GLOBUS_SUCCESS.
typedef void(* globus_gass_transfer_proto_func_t)( globus_gass_transfer_request_proto_t *proto, globus_gass_transfer_request_t request)¶
Protocol module implementation function type. Function pointers of this type are associated with the globus_gass_transfer_request_proto_t associated with a particular request handle. They are called when certain functions which modify the status of a request have been called by a client or server. A function of this type is used for the fail, deny, refer, authorize, and destroy fields of the globus_gass_transfer_request_proto_t. A protocol module can query the request handle to determine the status and, if applicable, denial reasons if necessary. Parameters:proto The protocol module's request handler.
request The request handle.
typedef void(* globus_gass_transfer_proto_listener_t)( globus_gass_transfer_listener_proto_t *proto, globus_gass_transfer_listener_t listener)¶
Protocol module implementation function type for server operations. Function pointers of this type are associated with the globus_gass_transfer_listener_proto_t associated with a particular listener handle. They are called when a server implementation wants to close the listener, listen for new connections, or destroy the listener. Parameters:proto The protocol-specific implementation of the
globus_gass_transfer_listener_proto_t for a particular listener.
listener The listener handle associated with the proto.
See also:
globus_gass_transfer_proto_create_listener_t
typedef globus_object_t*(* globus_gass_transfer_proto_new_attr_t)(char *url_scheme)¶
Protocol module implementation function type for attribute creation. A function pointer of this type is associated with the globus_gass_transfer_proto_descriptor_t defining a protocol module. It is called when a client requests a new request attribute set be created for a URL scheme handled by a protocol module. The function implementation must create a new request attribute usuable by the protocol. The returned attribute must be a globus object which inherits from one of the base attributes defined in the GASS Transfer API. A client or server operation will use a request attribute generated by this function when creating a new globus_gass_transfer_request_proto_t to handle a request. Parameters:url_scheme The URL scheme that the request
attribute should be compatible with.
Returns:
A globus_object_t-based request attribute.
See also:
globus_gass_transfer_proto_new_request_t,
globus_gass_transfer_proto_accept_t
typedef void(* globus_gass_transfer_proto_new_request_t)( globus_gass_transfer_request_t request, globus_gass_transfer_requestattr_t *attr)¶
Protocol module implementation function type for new client requests. A function pointer of this type is associated with the globus_gass_transfer_proto_descriptor_t for a particular protocol module's implementation. It is called when the client has begun a file transfer request by calling one of the functions in the '@ref globus_gass_transfer_client' section of this manual. When this function is called for a protocol module, the module should query the request handle to determine the URL which is being requested by the client, and the operation being done on that URL. The protocol module should initiate the request, and once it has determined that it has been authorized, denied, or referred, one of globus_gass_transfer_proto_request_ready(), globus_gass_transfer_proto_request_denied(), or globus_gass_transfer_proto_request_referred() must be called. Parameters:request The request handle containing the
information about the request.
attr A protocol-specific attribute set, created by calling the protocol
module's new_requestattr function pointer.
typedef void(* globus_gass_transfer_proto_receive_t)( globus_gass_transfer_request_proto_t *proto, globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t bytes_length, globus_size_t wait_for_length)¶
Protocol module function type to handle receiving data. A function pointer of this type is associated with the globus_gass_transfer_request_proto_t associated with a request handle. It is called when client or server has registered a bytes array for receiving from the client or server which is handling the request. The GASS Transfer Library will only pass one bytes array to the protocol module for processing per request at any given time. Once the protocol module has processed the array, it must call globus_gass_transfer_proto_receive_complete() to let the GASS Transfer library continue to process the request. Parameters:proto The protocol module's request handler.
request The request handle with which this block of bytes is associated.
bytes The user-supplied byte array containing the data associated with
the request.
bytes_length The length of the bytes array.
wait_for_length The minimum amount of data to receive before calling
globus_gass_transfer_proto_receive_complete() for the request. The GASS
Transfer protocol module may call that function with a smaller value for the
amount received if EOF has been reached.
See also:
globus_gass_transfer_receive_bytes()
typedef void(* globus_gass_transfer_proto_send_t)( globus_gass_transfer_request_proto_t *proto, globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t send_length, globus_bool_t last_data)¶
Protocol module function type to handle sending data. A function pointer of this type is associated with the globus_gass_transfer_request_proto_t associated with a request handle. It is called when client or server has registered a bytes array for sending to the client or server which is handling the request. The GASS Transfer Library will only pass one bytes array to the protocol module for processing per request at any given time. Once the protocol module has processed the array, it must call globus_gass_transfer_proto_send_complete() to let the GASS Transfer library continue to process the request. Parameters:proto The protocol module's request handler.
request The request handle with which this block of bytes is associated.
bytes The user-supplied byte array containing the data associated with
the request.
bytes_length The length of the bytes array.
last_data A flag to indicate whether this is the final block of data for
the request. If this is true, then the callback function will be
delayed until the server acknowledges that the file has been completely
received.
See also:
globus_gass_transfer_send_bytes()
typedef struct globus_gass_transfer_request_proto_s globus_gass_transfer_request_proto_t¶
Protocol module request handling structure. See also:globus_gass_transfer_request_proto_s
Function Documentation¶
void globus_gass_transfer_proto_listener_ready (globus_gass_transfer_listener_tlistener)¶
Server listener ready. This function notifies the GASS Transfer Library that the protocol module has decided that a new request can be accepted on this particular listener. It must only be called after the GASS Transfer Library has called the listen function in a globus_gass_transfer_listener_proto_t protocol module-specific listener structure. Parameters:listener The listener handle which is now ready
for accepting a new connection.
void globus_gass_transfer_proto_new_listener_request (globus_gass_transfer_listener_tlistener, globus_gass_transfer_request_trequest, globus_gass_transfer_request_proto_t *proto)¶
New listener request. This function notifies the GASS Transfer Library that new request generated by a server calling the globus_gass_transfer_register_accept() function has begun processing in a protocol module, and that protocol module is now ready to send or receive data to handle this request. Parameters:listener The listener handle used to accept this
request.
request The request handle used for this request. This was created by the
user calling one of the functions in the '@ref
globus_gass_transfer_client' section of this manual.
proto The protocol-module specific request structure. This structure
contains a set of function pointers to allow GASS to continue to process this
request.
globus_gass_transfer_client' section of this manual.
void globus_gass_transfer_proto_receive_complete ( globus_gass_transfer_request_trequest, globus_byte_t *bytes, globus_size_tnbytes, globus_bool_tfailed, globus_bool_tlast_data)¶
Data receive complete. A protocol module must call this function once a byte range registered for receive via the protocol module's recv_buffer method has been completely processed. This function is called for protocol modules implementing either server or client functionality. Parameters:request The request handle associated with this
byte array.
bytes The byte array which was received into. This should be the same as
the pointer passed in the send_buffer method.
nbytes The number of bytes which were sent from this byte array. This may
be different than length passed to the send_buffer method if an error occurred
or EOF was reached while receiving the data.
failed A boolean indicating whether this byte range was successfully
received or not. This should be set to GLOBUS_TRUE if either a protocol
error or a user-generated abort has occurred while processing the byte range.
If this is set to GLOBUS_TRUE, then the last_data parameter must
also be set to GLOBUS_TRUE.
last_data A boolean indicating whether this byte range was the final one
which can be processed for this request. This should be set to
GLOBUS_TRUE if an error occurred while processing this byte range, and
user-generated abort occurred, or this is the final byte range in the data
transfer.
See also:
globus_gass_transfer_send_bytes()
int globus_gass_transfer_proto_register_protocol ( globus_gass_transfer_proto_descriptor_t *proto_desc)¶
Register protocol. This function registers a protocol module handler with the GASS Transfer library. If this succeeds, then users of the library may use the URLs with the protocol scheme implemented by this module descriptor in GASS Transfer operations. Parameters:proto_desc The protocol module descriptor. See the
'@ref
globus_gass_transfer_protocol' section of the manual for information on this structure.
Return values:
globus_gass_transfer_protocol' section of the manual for information on this structure.
GLOBUS_SUCCESS The protocol module was
successfully registered with GASS.
GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The proto_desc parameter
was GLOBUS_NULL.
GLOBUS_GASS_TRANSFER_ERROR_ALREADY_REGISTERED A protocol module has
already been registered with GASS to handle this URL scheme.
void globus_gass_transfer_proto_request_denied ( globus_gass_transfer_request_trequest, intreason, char *message)¶
Request denied. This function notifies the GASS Transfer Library that new request generated by a client calling one of the functions in the '@ref globus_gass_transfer_client' section of the manual has been denied by the server, and so cannot be processed by the protocol module. Parameters:request The request handle used for this request.
This was created by the user calling one of the functions in the '@ref
globus_gass_transfer_client' section of this manual.
reason A protocol-specific reason code.
message A string containing a message describing why the request was
denied. The GASS Transfer library is responsible for freeing this message. It
must be allocated using one of the memory allocators defined in the Globus
Common Library.
See also:
globus_gass_transfer_client' section of this manual.
globus_gass_transfer_proto_request_ready(),
globus_gass_transfer_proto_request_referred()
void globus_gass_transfer_proto_request_ready ( globus_gass_transfer_request_trequest, globus_gass_transfer_request_proto_t *proto)¶
Request ready. This function notifies the GASS Transfer Library that new request generated by a client has begun processing in a protocol module, and that protocol module is now ready to send or receive data to handle this request. Parameters:request The request handle used for this request.
This was created by the user calling one of the functions in the '@ref
globus_gass_transfer_client' section of this manual.
proto The protocol-module specific request structure. This structure
contains a set of function pointers to allow GASS to continue to process this
request.
See also:
globus_gass_transfer_client' section of this manual.
globus_gass_transfer_proto_request_referred(),
globus_gass_transfer_proto_request_denied()
void globus_gass_transfer_proto_request_referred ( globus_gass_transfer_request_trequest, char **url, globus_size_tnum_urls)¶
Request referred. This function notifies the GASS Transfer Library that new request generated by a client calling one of the functions in the '@ref globus_gass_transfer_client' section of the manual has been referred to another URL by the server, and so processing has stopped. Parameters:request The request handle used for this request.
This was created by the user calling one of the functions in the '@ref
globus_gass_transfer_client' section of this manual.
url An array of url strings containing alternate locations for this file.
The GASS transfer library is responsible for freeing this array. It must be
allocated using one of the memory allocators defined in the Globus Common
Library.
num_urls The length of the url array.
See also:
globus_gass_transfer_client' section of this manual.
globus_gass_transfer_proto_request_ready(),
globus_gass_transfer_proto_request_denied(),
globus_gass_transfer_proto_request_referred()
void globus_gass_transfer_proto_send_complete ( globus_gass_transfer_request_trequest, globus_byte_t *bytes, globus_size_tnbytes, globus_bool_tfailed, globus_bool_tlast_data)¶
Data send complete. A protocol module must call this function once a byte range registered for sending via the protocol module's send_buffer method has been completely processed. This function is called for protocol modules implementing either server or client functionality. Parameters:request The request handle associated with this
byte array.
bytes The byte array which was sent. This should be the same as the
pointer passed in the send_buffer method.
nbytes The number of bytes which were sent from this byte array. This may
be different than length passed to the send_buffer method if an error
occurred.
failed A boolean indicating whether this byte range was successfully sent
or not. This should be set to GLOBUS_TRUE if either a protocol error or
a user-generated abort has occurred while processing the byte range. If this
is set to GLOBUS_TRUE, then the last_data parameter must also be
set to GLOBUS_TRUE.
last_data A boolean indicating whether this byte range was the final one
which can be processed for this request. This should be set to
GLOBUS_TRUE if an error occurred while processing this byte range, and
user-generated abort occurred, or this is the final byte range in the data
transfer.
See also:
globus_gass_transfer_send_bytes()
int globus_gass_transfer_proto_unregister_protocol ( globus_gass_transfer_proto_descriptor_t *proto_desc)¶
Unregister protocol. This function unregisters a protocol module handler from the GASS Transfer library. If this succeeds, then users of the library may no longer user URLs with the protocol scheme implemented by this module descriptor in GASS Transfer operations. Parameters:proto_desc The protocol module descriptor. See the
'@ref
globus_gass_transfer_protocol' section of the manual for information on this structure.
Return values:
globus_gass_transfer_protocol' section of the manual for information on this structure.
GLOBUS_SUCCESS The protocol module was
successfully registered with GASS.
GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The proto_desc parameter
was GLOBUS_NULL.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE A protocol module has not been
registered with GASS to handle this URL scheme.
Author¶
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