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transfer::transmitter(n) Data transfer facilities transfer::transmitter(n)
____________________________________________________________________________________________________________
NAME
transfer::transmitter - Data source
SYNOPSIS
package require Tcl 8.4
package require snit ?1.0?
package require transfer::copy ?0.2?
package require transfer::data::source ?0.2?
package require transfer::connect ?0.2?
package require transfer::transmitter ?0.2?
transfer::transmitter objectName ?options...?
transfer::transmitter stream channel chan host port ?arg...?
transfer::transmitter stream file path host port ?arg...?
objectName method ?arg arg ...?
objectName destroy
objectName start
objectName busy
____________________________________________________________________________________________________________
DESCRIPTION
This package pulls data sources and connection setup together into a combined object for the trans-mission transmission
mission of information over a socket. These objects understand all the options from objects created
by the packages transfer::data::source and transfer::connect.
API
PACKAGE COMMANDS
transfer::transmitter objectName ?options...?
This command creates a new transmitter object with an associated Tcl command whose name is
objectName. This object command is explained in full detail in the sections Object command
and Object methods. The set of supported options is explained in section Options.
The object command will be created under the current namespace if the objectName is not fully
qualified, and in the specified namespace otherwise. The fully qualified name of the object
command is returned as the result of the command.
transfer::transmitter stream channel chan host port ?arg...?
This method creates a fire-and-forget transfer for the data contained in the channel chan,
starting at the current seek location. The channel is configured to use binary translation and
encoding for the transfer. The channel is automatically closed when the transfer has com-pleted. completed.
pleted.
If both host and port are provided an active connection to the destination is made. If only a
port is specified (with host the empty string) then a passive connection is made instead.
Any arguments after the port are treated as options and are used to configure the internal
transmitter object. See the section Options for a list of the supported options and their
meaning. Note however that the signature of the command prefix specified for the -command
callback differs from the signature for the same option of the transmitter object. This call-back callback
back is only given the number of bytes and transfered, and possibly an error message. No ref-erence reference
erence to the internally used transmitter object is made.
The result returned by the command is the empty string if it was set to make an active connec-tion, connection,
tion, and the port the internal transmitter object is listening on otherwise, i.e when it is
configured to connect passively. See also the package transfer::connect and the description
of the method connect for where this behaviour comes from.
transfer::transmitter stream file path host port ?arg...?
This method is like stream channel, except that the data contained in the file path is trans-fered. transfered.
fered.
OBJECT COMMAND
All objects created by the ::transfer::transmitter command have the following general form:
objectName method ?arg arg ...?
The method method and its arg'uments determine the exact behavior of the command. See section
Object methods for the detailed specifications.
OBJECT METHODS
objectName destroy
This method destroys the object. Doing so while a transmission is in progress will cause
errors later on, when the transmission completes and tries to access the now missing data
structures of the destroyed object.
objectName start
This method initiates the data transmission, setting up the connection first and then copying
the information. The method will throw an error if a transmission is already/still in
progress. I.e. it is not possible to run two transmissions in parallel on a single object,
only in sequence. Multiple transmitter objects are needed to manage parallel transfers, one
per transmission. Errors will also be thrown if the configuration of the data source is
invalid, or if no completion callback was specified.
The result returned by the method is the empty string for an object configured to make an
active connection, and the port the object is listening on otherwise, i.e when it is config-ured configured
ured to connect passively. See also the package transfer::connect and the description of the
method connect for where this behaviour comes from.
objectName busy
This method returns a boolean value telling us whether a transmission is in progress (True),
or not (False).
OPTIONS
All transmitter objects support the union of the options supported by their connect and data source
components, plus two of their own. See also the documentation for the packages trans-fer::data::source transfer::data::source
fer::data::source and transfer::connect.
-blocksize int
This option specifies the size of the chunks to be transmitted in one block. Usage is
optional, its default value is 1024.
-command cmdprefix
This option specifies the command to invoke when the transmission of the information has been
completed. The arguments given to this command are the same as given to the completion call-back callback
back of the command transfer::copy::do provided by the package transfer::copy.
-mode mode
This option specifies the mode the object is in. It is optional and defaults to active mode.
The two possible modes are:
active In this mode the two options -host and -port are relevant and specify the host and TCP
port the object has to connect to. The host is given by either name or IP address.
passive
In this mode the option -host has no relevance and is ignored should it be configured.
The only option the object needs is -port, and it specifies the TCP port on which the
listening socket is opened to await the connection from the partner.
-host hostname-or-ipaddr
This option specifies the host to connect to in active mode, either by name or ip-address. An
object configured for passive mode ignores this option.
-port int
For active mode this option specifies the port the object is expected to connect to. For pas-sive passive
sive mode however it is the port where the object creates the listening socket waiting for a
connection. It defaults to 0, which allows the OS to choose the actual port to listen on.
-socketcmd command
This option allows the user to specify which command to use to open a socket. The default is
to use the builtin ::socket. Any compatible with that command is allowed.
The envisioned main use is the specfication of tls::socket. I.e. this option allows the cre-ation creation
ation of secure transfer channels, without making this package explicitly dependent on the tls
package.
See also section Secure connections.
-encoding encodingname
-eofchar eofspec
-translation transspec
These options are the same as are recognized by the builtin command fconfigure. They provide
the configuration to be set for the channel between the two partners after it has been estab-lished, established,
lished, but before the callback is invoked (See method connect).
-string text
This option specifies that the source of the data is an immediate string, and its associated
argument contains the string in question.
-channel handle
This option specifies that the source of the data is a channel, and its associated argument is
the handle of the channel containing the data.
-file path
This option specifies that the source of the data is a file, and its associated argument is
the path of the file containing the data.
-variable varname
This option specifies that the source of the data is a string stored in a variable, and its
associated argument contains the name of the variable in question. The variable is assumed to
be global or namespaced, anchored at the global namespace.
-size int
This option specifies the size of the data transfer. It is optional and defaults to -1. This
value, and any other value less than zero signals to transfer all the data from the source.
-progress command
This option, if specified, defines a command to be invoked for each chunk of bytes transmit-ted, transmitted,
ted, allowing the user to monitor the progress of the transmission of the data. The callback
is always invoked with one additional argument, the number of bytes transmitted so far.
SECURE CONNECTIONS
One way to secure connections made by objects of this package is to require the package tls and then
configure the option -socketcmd to force the use of command tls::socket to open the socket.
# Load and initialize tls
package require tls
tls::init -cafile /path/to/ca/cert -keyfile ...
# Create a connector with secure socket setup,
transfer::transmitter T -socketcmd tls::socket ...
...
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems.
Please report such in the category transfer of the Tcllib SF Trackers [http://source -
forge.net/tracker/? group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
KEYWORDS
channel, copy, data source, secure, ssl, tls, transfer, transmitter
CATEGORY
Transfer module
COPYRIGHT
Copyright (c) 2006-2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>
transfer 0.2 transfer::transmitter(n)
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