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# wslink
Wslink allows easy, bi-directional communication between a python server and a
javascript client over a [websocket]. The client can make RPC calls to the
server, and the server can publish messages to topics that the client can
subscribe to. The server can include binary attachments in these messages,
which are communicated as a binary websocket message, avoiding the overhead of
encoding and decoding.
## RPC and publish/subscribe
The initial users of wslink driving its development are [VTK] and [ParaViewWeb].
ParaViewWeb and vtkWeb require:
* RPC - a remote procedure call that can be fired by the client and return
sometime later with a response from the server, possibly an error.
* Publish/subscribe - client can subscribe to a topic provided by the server,
possibly with a filter on the parts of interest. When the topic has updated
results, the server publishes them to the client, without further action on
the client's part.
## Get the whole story
This package is just the client side of wslink. See the [github repo] for
the full story - and to contribute or report issues!
## License
Free to use in open-source and commercial projects, under the BSD-3-Clause license.
[github repo]: https://github.com/kitware/wslink
[ParaViewWeb]: https://www.paraview.org/web/
[VTK]: http://www.vtk.org/
[websocket]: https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
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