golang-socketio/handler.go

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package gosocketio
import (
"encoding/json"
"forge.cadoles.com/Pyxis/golang-socketio/protocol"
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"sync"
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"reflect"
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)
const (
OnConnection = "connection"
OnDisconnection = "disconnection"
OnError = "error"
)
/**
System handler function for internal event processing
*/
type systemHandler func(c *Channel)
/**
Contains maps of message processing functions
*/
type methods struct {
messageHandlers map[string]*caller
messageHandlersLock sync.RWMutex
onConnection systemHandler
onDisconnection systemHandler
}
/**
create messageHandlers map
*/
func (m *methods) initMethods() {
m.messageHandlers = make(map[string]*caller)
}
/**
Add message processing function, and bind it to given method
*/
func (m *methods) On(method string, f interface{}) error {
c, err := newCaller(f)
if err != nil {
return err
}
m.messageHandlersLock.Lock()
defer m.messageHandlersLock.Unlock()
m.messageHandlers[method] = c
return nil
}
/**
Find message processing function associated with given method
*/
func (m *methods) findMethod(method string) (*caller, bool) {
m.messageHandlersLock.RLock()
defer m.messageHandlersLock.RUnlock()
f, ok := m.messageHandlers[method]
return f, ok
}
func (m *methods) callLoopEvent(c *Channel, event string) {
if m.onConnection != nil && event == OnConnection {
m.onConnection(c)
}
if m.onDisconnection != nil && event == OnDisconnection {
m.onDisconnection(c)
}
f, ok := m.findMethod(event)
if !ok {
return
}
f.callFunc(c, &struct{}{})
}
/**
Check incoming message
On ack_resp - look for waiter
On ack_req - look for processing function and send ack_resp
On emit - look for processing function
*/
func (m *methods) processIncomingMessage(c *Channel, msg *protocol.Message) {
switch msg.Type {
case protocol.MessageTypeEmit:
f, ok := m.findMethod(msg.Method)
if !ok {
return
}
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if !f.ArgsPresent {
f.callFunc(c, &struct{}{})
return
}
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data := f.getArgs()
err := json.Unmarshal([]byte(msg.Args), &data)
if err != nil {
return
}
f.callFunc(c, data)
case protocol.MessageTypeAckRequest:
f, ok := m.findMethod(msg.Method)
if !ok || !f.Out {
return
}
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var result []reflect.Value
if f.ArgsPresent {
//data type should be defined for unmarshall
data := f.getArgs()
err := json.Unmarshal([]byte(msg.Args), &data)
if err != nil {
return
}
result = f.callFunc(c, data)
} else {
result = f.callFunc(c, &struct{}{})
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}
ack := &protocol.Message{
Type: protocol.MessageTypeAckResponse,
AckId: msg.AckId,
}
send(ack, c, result[0].Interface())
case protocol.MessageTypeAckResponse:
waiter, err := c.ack.getWaiter(msg.AckId)
if err == nil {
waiter <- msg.Args
}
}
}