CODEWITHSUNDEEP
websocketjulia
2Cubed
2Cubed

Reputation: 3551

How can I write a WebSocket client in Julia?

I would like to connect to a WebSocket via Julia. I attempted to get an echo response from wss://echo.websocket.org, but it does not seem to respond as I would have expected it to. Interestingly, it does seem to connect, though, whereas an invalid address will not.

julia> client = connect("echo.websocket.org", 443)
TCPSocket(open, 0 bytes waiting)

julia> println(client, "Hello, world!")

julia> readline(client)
""

Is it possible to accomplish this?

Upvotes: 4

Views: 1866

Answers (2)

widged
widged

Reputation: 2779

There is now a specific library https://github.com/JuliaWeb/WebSockets.jl. Examples of how to use it are provided in examples/chat.jl and examples/chat-client.html.

Upvotes: 3

aviks
aviks

Reputation: 2097

Web socket clients cannot be implemented by opening a socket and reading and writing directly to it. There is a reasonably complicated protocol that needs to be implemented. Further, a websocket client is meant to receive push request, and hence needs some way to handle them asynchronously.

There is a websocket client library implemented in Julia: https://github.com/dandeliondeathray/DandelionWebSockets.jl

To install it, do: Pkg.clone("https://github.com/dandeliondeathray/DandelionWebSockets.jl")

To use it involves defining event handlers for network events. Please see here for an example using echo: https://github.com/dandeliondeathray/DandelionWebSockets.jl/blob/b23307f360ef0b62e3064c6b1484599eb660f63f/examples/echo.jl

Upvotes: 2

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