Hello,
I'm sending messages over websocket.
I have a "generic" MessageRequest and MessageResponse struct.
type MessageRequest struct {
Type string `json:"type"`
Payload interface{} `json:"payload"`
}
type MessageResponse struct {
Type string `json:"type"`
Payload interface{} `json:"payload"`
}
I'm trying to unmarshall this.
m := new(MessageRequest)
if e := json.Unmarshal(msg, m); e != nil {
logrus.Error(e)
return
}
Then I switch by MessageRequest.Type to know what kind of message was sent
by the client.
However, when I do something like
payload, ok := m.Payload.(*MessageRequest)
if !ok {
//error
}
It isn't compatible to type *MessageRequest
As a workaround I could imagine marshalling the interface again, then
unmarshalling into the correct message payload type (e.g. ChatMessage)
But that is unnecessary overhead. However it beats marshalling into
map[string]interface and manually assigning values in terms of code
readability.
tmp, e := json.Marshal(m.Payload)
if e != nil {
logrus.Error(e)
return
}
payload := new(model.ChatMessage)
if e := json.Unmarshal(tmp, payload); e != nil {
logrus.Error(e)
return
}
vs
pmap, ok := m.Payload.(map[string]interface{})
if !ok {
logrus.Error("can not convert to map[string]interface{}")
return
}
payload := new(model.ChatMessage)
user := pmap["user"].(string)
payload.User = user
message := pmap["message"].(string)
payload.Message = message
tme := pmap["time"].(string)
tmee, e := time.Parse(time.RFC3339, tme)
if e != nil {
logrus.Error("time parse error")
return
}
payload.Time = tmee
Is there a better solution to solve this?
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