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NAME

       Implementing Servers -

       GASS Server Implementation API.

   Typedefs
       typedef void(* globus_gass_transfer_close_callback_t )(void
           *callback_arg, globus_gass_transfer_listener_t listener)
       typedef void(* globus_gass_transfer_listen_callback_t )(void
           *callback_arg, globus_gass_transfer_listener_t listener)

   Functions
       int globus_gass_transfer_create_listener
           (globus_gass_transfer_listener_t *listener,
           globus_gass_transfer_listenerattr_t *attr, char *scheme)
       int globus_gass_transfer_close_listener
           (globus_gass_transfer_listener_t listener,
           globus_gass_transfer_close_callback_t callback, void *user_arg)
       int globus_gass_transfer_register_listen
           (globus_gass_transfer_listener_t listener,
           globus_gass_transfer_listen_callback_t callback, void *user_arg)
       int globus_gass_transfer_register_accept
           (globus_gass_transfer_request_t *request,
           globus_gass_transfer_requestattr_t *attr,
           globus_gass_transfer_listener_t listener,
           globus_gass_transfer_callback_t callback, void *user_arg)
       void * globus_gass_transfer_listener_get_user_pointer
           (globus_gass_transfer_listener_t listener)
       int globus_gass_transfer_listener_set_user_pointer
           (globus_gass_transfer_listener_t listener, void *user_pointer)
       char * globus_gass_transfer_listener_get_base_url
           (globus_gass_transfer_listener_t listener)
       int globus_gass_transfer_refer (globus_gass_transfer_request_t request,
           char **urls, globus_size_t num_urls)
       int globus_gass_transfer_authorize (globus_gass_transfer_request_t
           request, globus_size_t total_length)
       int globus_gass_transfer_deny (globus_gass_transfer_request_t request,
           int reason, char *message)

Detailed Description

       GASS Server Implementation API.

       Another mode of using the GASS Transfer API is to implement data
       servers. The primary difference between the client and server parts of
       the GASS Transfer API are how requests are generated.

       To implement a server, the user would call
       globus_gass_transfer_create_listener() to create a new server port on
       which a specific protocol will be used to request file transfer
       operations. The user may obtain the URL that the listener is bound to
       by calling globus_gass_transfer_listener_get_base_url().

       Once the listener is created, the user can call
       globus_gass_transfer_register_listen() to wait for clients to connect
       to it. Once the server has detected an attempt to connect by a client,
       the use can call globus_gass_transfer_register_accept() to accept the
       connection from the client and parse the request.

       In the callback associated with globus_gass_transfer_register_accept(),
       the server can decide how to process the request. The user may choose
       to authorize the request by calling globus_gass_transfer_authorize(),
       refer it to another URL or URLs by calling globus_gass_transfer_refer()
       or deny the client access to the URL by calling
       globus_gass_transfer_deny().

Typedef Documentation

   typedef void(*  globus_gass_transfer_close_callback_t)(void *callback_arg,
       globus_gass_transfer_listener_t listener)
       Listener close callback. Parameters:
           callback_arg
           listener

   typedef void(*  globus_gass_transfer_listen_callback_t)(void *callback_arg,
       globus_gass_transfer_listener_t listener)
       Listen callback. Parameters:
           callback_arg
           listener

Function Documentation

   int globus_gass_transfer_create_listener (globus_gass_transfer_listener_t *
       listener, globus_gass_transfer_listenerattr_t * attr, char * scheme)
       Create a new protocol-specific listener socket for a GASS server. This
       function creates a new socket to listen for client connections as a
       GASS server. The listener handle pointer is initialized to contain the
       a new handle which can be used in subsequent server operations.

       After calling this function, a user may call the
       globus_gass_transfer_register_listen() or
       globus_gass_transfer_close_listener() functions with this listener
       handle.

       Parameters:
           listener A new listener handle to initialize.
           attr Protocol-specific attributes for the new listener.
           scheme The protocol scheme to implement for the listener.

       Return values:
           GLOBUS_SUCCESS The listener was successfully created.
           GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The listener or scheme
           parameter was NULL
           GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The scheme is not
           supported by any protocol module.
           GLOBUS_GASS_TRANSFER_ERROR_MALLOC_FAILED Data structures associated
           with the transfer could not be allocated.

   int globus_gass_transfer_close_listener (globus_gass_transfer_listener_t
       listener, globus_gass_transfer_close_callback_t callback, void *
       user_arg)
       Close a GASS listener. This function calls the protocol specific
       function needed to close a GASS server listener port. Callbacks for any
       outstanding accepts will be called before the close callback is
       invoked.

       Parameters:
           listener Listener handle created by calling
           globus_gass_transfer_create_listener().
           callback Function to call once the listener handle has been closed.
           user_arg Argument to be passed to the callback function.

       Return values:
           GLOBUS_SUCCESS The close operation was successfully registered on
           the listener.
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The listener handle was
           invalid.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED The listener handle was
           not properly initialized.
           GLOBUS_GASS_TRANSFER_ERROR_DONE A close has already been registered
           on the listener.

   int globus_gass_transfer_register_listen (globus_gass_transfer_listener_t
       listener, globus_gass_transfer_listen_callback_t callback, void *
       user_arg)
       Listen for new client connections. This function causes the listener
       handle to listen for new client connections. When one is ready, it
       calls the specified callback function, letting the server implementer
       continue to accept the connection and process the request.

       Parameters:
           listener The listener handle to register for new connections.
           callback Function to call when a new connection may be accepted.
           user_arg Argument to be passed to the callback function.

       Return values:
           GLOBUS_SUCCESS The listen callback has been registered with the
           protocol module.
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE An invalid listener handle
           was passed to this function.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED An uninitialized
           listener handle was passed to this function.
           GLOBUS_GASS_TRANSFER_ERROR_ALREADY_REGISTERED The listener has
           already been registered for a new connection.
           GLOBUS_GASS_TRANSFER_ERROR_DONE The listener has been registered
           for closing.

       See also:
           globus_gass_transfer_register_accept();

   int globus_gass_transfer_register_accept (globus_gass_transfer_request_t *
       request, globus_gass_transfer_requestattr_t * attr,
       globus_gass_transfer_listener_t listener,
       globus_gass_transfer_callback_t callback, void * user_arg)
       Accept new client connections. This function causes the listener handle
       to accept a new connection on the listener and parse the file request.
       Once the file request has been parsed, the specified callback function
       will be called. The server implementation must then either authorize,
       deny, or refer this request.

       Parameters:
           request A pointer to a new request handle. This request handle will
           be initialized when the callback function is invoked.
           attr Request attributes.
           listener The listener handle to register for the new request.
           callback Function to call when the protocol module has parsed the
           file request.
           user_arg Argument to be passed to the callback function.

       Return values:
           GLOBUS_SUCCESS The listen callback has been registered with the
           protocol module.
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE An invalid listener handle
           was passed to this function.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED An uninitialized
           listener handle was passed to this function.
           GLOBUS_GASS_TRANSFER_ERROR_INTERNAL_ERROR The request could not be
           initialized due to some internal resource depletion.
           GLOBUS_GASS_NOT_REGISTERED. The
           globus_gass_transfer_register_listen() function has not yet been
           called.
           GLOBUS_GASS_ALREADY_REGISTERED. The listener is already processing
           a new request.
           GLOBUS_GASS_TRANSFER_ERROR_DONE The listener has been registered
           for closing.

       See also:
           globus_gass_transfer_register_listen();

   void* globus_gass_transfer_listener_get_user_pointer
       (globus_gass_transfer_listener_t listener)
       Get the user pointer associated with a listener. This function will
       query the listener’s user_pointer field and return it’s value.

       Parameters:
           listener The listener handle.

       Returns:
           If the listener handle is invalid or the user_pointer’s value has
           not been set, then GLOBUS_NULL will be returned. Otherwise, the
           value of the user pointer will be returned.

       See also:
           globus_gass_transfer_listener_set_user_pointer()

   int globus_gass_transfer_listener_set_user_pointer
       (globus_gass_transfer_listener_t listener, void * user_pointer)
       Set the user pointer associated with a listener. This function will set
       the listener’s user_pointer field. The pointer may be used to associate
       any pointer-sized data with a listener handle.

       Parameters:
           listener The listener handle.
           user_pointer The value of the user pointer.

       Return values:
           GLOBUS_SUCCESS The user pointer was successfully set.
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The listener handle was
           invalid.

       See also:
           globus_gass_transfer_listener_get_user_pointer()

   char* globus_gass_transfer_listener_get_base_url
       (globus_gass_transfer_listener_t listener)
       Get the base URL of a listener. This function queries a listener handle
       for the base URL which the server is listening on. For most protocols,
       this contains the protocol scheme, host, and port that the listener has
       registered itself on.

       Parameters:
           listener The listener handle to query.

       Returns:
           This function returns a pointer to a string containing the base
           URL. This string must not be freed or modified by the caller. It
           may not be referred to after the function
           globus_gass_transfer_listener_close() has been called.

   int globus_gass_transfer_refer (globus_gass_transfer_request_t request,
       char ** urls, globus_size_t num_urls)
       Refer a request. This function causes the request to be referred to
       another URL or list of URLs. It should be called in response to a
       request accept callback when the server wants to refer the client to
       another server or servers to process the request.

       Parameters:
           request A new request handle, passed to the server in an accept
           callback.
           urls An array of strings, each being a URL pointing to sources of
           the same data as the original URL.
           num_urls The length of the urls array.

       Return values:
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
           valid, not created by calling
           globus_gass_transfer_register_accept(), or has already been denied
           or authorized.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
           not support referrals.

       See also:
           globus_gass_transfer_deny(), globus_gass_transfer_authorize()

   int globus_gass_transfer_authorize (globus_gass_transfer_request_t request,
       globus_size_t total_length)
       Authorize a request. This function causes the request to be authorized
       for processing. It should be called in response to a request accept
       callback when the server wants to agree to process this request. After
       calling this function, the server implementation should call
       globus_gass_transfer_send_bytes() or
       globus_gass_transfer_receive_bytes() to send or receive the data
       associated with the URL.

       Parameters:
           request A new request handle, passed to the server in an accept
           callback.
           total_length For a ’get’ request, the total_length of the file to
           be retrieved if known. This value may be GLOBUS_GASS_LENGTH_UNKNOWN
           if the protocol supports transferring arbitrarily-sized files.

       Return values:
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
           valid, not created by calling
           globus_gass_transfer_register_accept(), or has already been denied
           or authorized.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
           not support authorizing requests.

       See also:
           globus_gass_transfer_refer(), globus_gass_transfer_deny()

   int globus_gass_transfer_deny (globus_gass_transfer_request_t request, int
       reason, char * message)
       Deny a request. This function causes the request to be denied for
       further processing. It should be called in response to a request ccept
       callback when the server wants to refuse processing this request for
       the client. After calling this function, the server implementation need
       do nothing further with the request handle.

       Parameters:
           request A new request handle, passed to the server in an accept
           callback.
           reason A protocol-specific reason code.
           message An informational message to be sent to the client.

       Return values:
           GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
           valid, not created by calling
           globus_gass_transfer_register_accept(), or has already been denied
           or authorized.
           GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
           not support denying requests.

       See also:
           globus_gass_transfer_refer(), globus_gass_transfer_authorize()

Author

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