/
channels.go
101 lines (90 loc) · 2.03 KB
/
channels.go
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package pusher
import (
"sync"
)
type Channels struct {
sync.RWMutex
channels map[string]*Channel
global *Channel
connected bool
}
func (c *Channels) handleEvent(event *Event) {
// send event to global channel
c.global.handleEvent(event)
if event.Channel == "" {
// global only event.
return
}
// send event to subscribed channel
ch := c.find(event.Channel)
if ch != nil {
ch.handleEvent(event)
}
}
func (c *Channels) connectedState(connected bool) {
c.RLock()
defer c.RUnlock()
// cache connected state
c.connected = connected
// notify all channels of the connection state
for _, ch := range c.channels {
ch.connectedState(connected)
}
}
func (c *Channels) find(channel string) *Channel {
// empty channel name is for receiving events from all subscribed channels.
if channel == "" {
return c.global
}
// mutex is for the 'channels' map
c.RLock()
defer c.RUnlock()
return c.channels[channel]
}
func (c *Channels) add(channel string, client *Client) *Channel {
// empty channel name is for receiving events from all subscribed channels.
if channel == "" {
return c.global
}
// mutex is for the 'channels' map
c.Lock()
defer c.Unlock()
// check if the channel exists.
ch := c.channels[channel]
if ch == nil {
// create a new channel
ch = newChannel(channel, client)
c.channels[channel] = ch
}
if c.connected {
ch.subscribe()
}
return ch
}
func (c *Channels) remove(channel string) {
// empty channel name is for receiving events from all subscribed channels.
if channel == "" {
// can't remove the global channel.
return
}
// mutex is for the 'channels' map
c.Lock()
defer c.Unlock()
ch := c.channels[channel]
if ch != nil && c.connected {
ch.unsubscribe()
}
delete(c.channels, channel)
}
func (c *Channels) bind(event string, h Handler) {
c.global.Bind(event, h)
}
func (c *Channels) unbind(event string, h Handler) {
c.global.Unbind(event, h)
}
func newChannels(client *Client) *Channels {
return &Channels{
channels: make(map[string]*Channel),
global: newChannel("", client),
}
}