Golang connection to angularjs - angularjs

Question

How do I connect a backend server in go lang to angularjs? I know angularjs communicates with go via $http or $resource services but what part of the go code links communicates with angular once all the data structs have been made? Would this be the encoded/marshalled json or do we create some kind of route...
I am a newbie looking to start this project after studying angular and go but this is the part i don't understand - what is the end point from go that angulars $resource or $http service links with?

Answer 1

Create a http endpoint that reads json string, unmarshalls it, does some logic with it and writes a json string to the response. E.g:
func main() {
http.HandleFunc("/api/", apiHandler)
logInfo(fmt.Sprintf("Starting server on port %d", serverPort))
err := http.ListenAndServe(fmt.Sprintf(":%d", serverPort), nil)
if err != nil {
logError(err)
}
}
func apiHandler(w http.ResponseWriter, r *http.Request) {
//ensure its a post
method := r.Method
if method != "POST" {
fail(w, "Invalid http method")
return
}
requestData, err := ioutil.ReadAll(r.Body)
if err != nil {
fail(w, err.Error())
return
}
respData, err := doBusinessLogicWithData(requestData)
if err != nil {
fail(w, err.Error())
return
}
respJSONBytes, err := json.Marshal(respData)
if err != nil {
fail(w, err.Error())
return
}
fmt.Fprintln(w, string(respJSONBytes))
}
func fail(w http.ResponseWriter, message string) {
result := &struct {
Success bool
Message string
}{
Success: false,
Message: message,
}
resultJSONBytes, err := json.Marshal(result)
if err != nil {
logError(err)
fmt.Fprintln(w, "Unable to generate result")
return
}
fmt.Fprintln(w, string(resultJSONBytes))
}