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Echo Server
In this example we’re going to create a really simple system which contains a hellhound webserver which reponds with what is gets via the ws connection.
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As you already know, HellHound communications happens over websocket connection which creates by the
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In order to execute the following example from the hellhound_examples repository. Just issue the following command in the repository root directory.
Ok let’s jump into the code.
link:simple_webserver1.clj[role=include]| 1 | HellHound’s webserver component ns. |
| 2 | HellHound’s transform component ns. |
| 3 | Webserver component. The name of this component
would be ::hellhound.components.webserver/webserver
We used hellhound.http/default-routes as the routes
definition. But you can provide your own routes as long
as it contains the hellhound websocket endpoint.
Also as a shortcut you can use hellhound.components.webserver/default-factory.
It’s just a shortcut around hellhound.components.webserver/factory. |
| 4 | Transform component is a very simple component which redirects incoming messages from input stream to output stream and applies the given function to each message. In this case we don’t do any transformation. We just log the message. |
| 5 | A closed workflow. In this workflow the output of ::output
component would be the input of ::web/webserver component
while the output of ::web/webserver would be the input
of ::output. The important thing to remember in this example
is that basically the output of the webserver component is a
stream of data which receives from clients via websocket.
other requests to none websocket endpoint handle synchronously
by pedestal interceptors. In general we highly recommend to avoid
this situation and implement your views in client side which is
connected to HellHound server by a websocket |
Run the example code and then use below code in your browser console to test the echo server.
ws = new WebSocket("ws://localhost:3000/ws")
ws.onmessage = function(e) { console.log(e.data) }
ws.send("hello world")After running the above code you’re going to see "hello world" on your js console.
In this example data flow from webserver component to the output component and back to webserver component as the input and webserver component send its input to the client side application using the ws connection.
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