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Sending a nested Go struct as JSON over a WebSocket to JavaScript
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| <html> | |
| <head> | |
| <title>WebSocket tutorial</title> | |
| <script type="text/JavaScript" src="printJSONFromWebSocket.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| ws = new WebSocket("ws://localhost:8000/ws/"); | |
| ws.onopen = function (event) { | |
| console.log("WEB SOCKET OPENED"); | |
| } | |
| ws.onmessage = function (event) { | |
| var obj = JSON.parse(event.data) | |
| document.write("<br>onmessage: " + JSON.stringify(obj, null, 4) + "</br>"); | |
| console.log(JSON.stringify(obj, null, 4)) | |
| } | |
| ws.onclose = function (event) { | |
| console.log("WEB SOCKET CLOSED"); | |
| } | |
| function addNode(node) { | |
| console.log("Adding new node: " + node) | |
| } |
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| { | |
| "Channel": { | |
| "AddNodes": [ | |
| "node1", | |
| "node2" | |
| ] | |
| } | |
| } | |
| { | |
| "Channel": { | |
| "RemoveNodes": [ | |
| "node1", | |
| "node2" | |
| ] | |
| } | |
| } | |
| { | |
| "Channel": { | |
| "AddEdges": [ | |
| { | |
| "SourceNode": "node1", | |
| "TargetNode": "node2", | |
| "Name": "request piece" | |
| }, | |
| { | |
| "SourceNode": "node2", | |
| "TargetNode": "node3", | |
| "Name": "cancel piece" | |
| } | |
| ] | |
| } | |
| } | |
| { | |
| "Channel": { | |
| "RemoveEdges": [ | |
| { | |
| "SourceNode": "node1", | |
| "TargetNode": "node2", | |
| "Name": "request piece" | |
| }, | |
| { | |
| "SourceNode": "node2", | |
| "DestNode": "node3", | |
| "Name": "cancel piece" | |
| } | |
| ] | |
| } | |
| } | |
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| package main | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "os" | |
| "code.google.com/p/go.net/websocket" | |
| "encoding/json" | |
| ) | |
| type ChannelUpdate struct { | |
| Channel interface{} | |
| } | |
| type AddNewNodes struct { | |
| AddNodes []string | |
| } | |
| func main() { | |
| if len(os.Args) != 2 { | |
| fmt.Println("Usage: wstelnet port") | |
| os.Exit(0) | |
| } | |
| port := os.Args[1] | |
| fmt.Println("Serving web on port", port) | |
| service := ":" + port | |
| http.Handle("/", http.FileServer(http.Dir("."))) | |
| http.Handle("/ws/", websocket.Handler(ProcessSocket)) | |
| err := http.ListenAndServe(service, nil) | |
| checkError(err) | |
| } | |
| func ProcessSocket(ws *websocket.Conn) { | |
| fmt.Println("In ProcessSocket") | |
| nodes := make([]string, 2) | |
| nodes[0] = "node1" | |
| nodes[1] = "node2" | |
| addNodes := new(AddNewNodes) | |
| addNodes.AddNodes = nodes | |
| channelUpdate := new(ChannelUpdate) | |
| channelUpdate.Channel = addNodes | |
| updateJson, err := json.Marshal(channelUpdate) | |
| msg := string(updateJson) | |
| err = websocket.Message.Send(ws, msg) | |
| checkError(err) | |
| ws.Close() | |
| return | |
| } | |
| func checkError(err error) { | |
| if err != nil { | |
| fmt.Println("Fatal error ", err.Error()) | |
| os.Exit(1) | |
| } | |
| } |
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