gopherjs-rpc

Example of use of gopherjs + websocket + jsonrpc

Preparation

• Have Go 1.4 or better (gopherjs requirement)
• go get -u -v github.com/gopherjs/gopherjs [godoc]
• go get -u -v github.com/gopherjs/websocket [godoc]
• go get -u -v honnef.co/go/js/dom [godoc]

Get the code and run!

• cd $GOROOT (or to any of the directories featured in your $GOROOT if you have more than one, like me)
• git clone https://github.com/dustywilson/gopherjs-rpc.git
• cd gopherjs-rpc
• cd www to enter the www directory where the client.go file is waiting for you to build
• gopherjs build -m -o client.js to build the client.go file into client.js
• cd .. to return to parent
• go run server.go to run the server-side
• Go to http://localhost:5454/ in your browser

If you got log messages in the browser dev console, it's working. The Output line is what the JavaScript client is sending to the Go server. The Input line is what the Go server sends to the client in response. The only thing that differs in each message is the timestamp. The server spits out the same info to the console on its end as well.

Notes

Notice that both the backend and frontend share the file in the shared directory. In this case, they use that to share the ChatMessage struct. For the most part, you can share code between frontend and backend.

You CAN'T use the core websocket lib with gopherjs. If you start getting errors saying something like gopherjs doesn't support network then you've used the wrong package.

This is rpc on top of websocket. In this case, the web browser is hosting RPC for the server to call. For as long as the client is connected to the server, the server is able to call on any of its RPC functions. Totally backwards, but really cool that it's possible.