// processMessage processes a single message and calls a handler or callback.
func (c *Client) processMessage(data []byte) (msg *dnode.Message, fn interface{}, err error) {
// Call error handler.
defer func() {
if err != nil {
onError(err)
}
}()
msg = &dnode.Message{}
if err = json.Unmarshal(data, &msg); err != nil {
return nil, nil, err
}
sender := func(id uint64, args []interface{}) error {
// do not name the error variable to "err" here, it's a trap for
// shadowing variables
_, _, e := c.marshalAndSend(id, args)
return e
}
// Replace function placeholders with real functions.
if err := dnode.ParseCallbacks(msg, sender); err != nil {
return nil, nil, err
}
// Find the handler function. Method may be string or integer.
switch method := msg.Method.(type) {
case float64:
id := uint64(method)
callback := c.scrubber.GetCallback(id)
if callback == nil {
err = dnode.CallbackNotFoundError{
ID: id,
Args: msg.Arguments,
}
return nil, nil, err
}
return msg, callback, nil
case string:
m, ok := c.LocalKite.handlers[method]
if !ok {
err = dnode.MethodNotFoundError{
Method: method,
Args: msg.Arguments,
}
return nil, nil, err
}
return msg, m, nil
default:
return nil, nil, fmt.Errorf("Method is not string or integer: %+v (%T)", msg.Method, msg.Method)
}
}
// processMessage processes a single message and calls a handler or callback.
func (c *Client) processMessage(data []byte) (err error) {
var (
ok bool
msg dnode.Message
m *Method
)
// Call error handler.
defer func() {
if err != nil {
onError(err)
}
}()
if err := json.Unmarshal(data, &msg); err != nil {
return err
}
sender := func(id uint64, args []interface{}) error {
// do not name the error variable to "err" here, it's a trap for
// shadowing variables
_, errc := c.marshalAndSend(id, args)
return errc
}
// Replace function placeholders with real functions.
if err := dnode.ParseCallbacks(&msg, sender); err != nil {
return err
}
// Find the handler function. Method may be string or integer.
switch method := msg.Method.(type) {
case float64:
id := uint64(method)
callback := c.scrubber.GetCallback(id)
if callback == nil {
err = dnode.CallbackNotFoundError{id, msg.Arguments}
return err
}
c.runCallback(callback, msg.Arguments)
case string:
if m, ok = c.LocalKite.handlers[method]; !ok {
err = dnode.MethodNotFoundError{method, msg.Arguments}
return err
}
c.runMethod(m, msg.Arguments)
default:
return fmt.Errorf("Method is not string or integer: %+v (%T)", msg.Method, msg.Method)
}
return nil
}