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connection.go
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connection.go
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package socketify
import (
"encoding/json"
"fmt"
"github.com/gorilla/websocket"
"github.com/teris-io/shortid"
"sync"
)
type Client struct {
id string
server *Socketify
ws *websocket.Conn
updates chan *Update
writer chan *serverUpdate
handlers map[string]func(message json.RawMessage)
handlersLocker sync.Mutex
closed chan bool
}
func newClient(server *Socketify, ws *websocket.Conn) (c *Client) {
c = &Client{
id: shortid.MustGenerate(),
server: server,
ws: ws,
updates: make(chan *Update),
writer: make(chan *serverUpdate),
handlers: map[string]func(message json.RawMessage){},
closed: make(chan bool),
}
go c.processWriter()
return
}
func (c *Client) ID() string {
return c.id
}
func (c *Client) processWriter() {
for update := range c.writer {
err := c.ws.WriteJSON(serverUpdate{
Type: update.Type,
Data: update.Data,
})
if err != nil {
c.server.opts.logger.Error("Error writing JSON", err, fmt.Sprintf("Update Type: %s - Update Data: %s. RemoteAddr: %s", update.Type, update.Data, c.ws.RemoteAddr().String()))
}
}
}
func (c *Client) WriteUpdate(updateType string, data interface{}) {
c.writer <- &serverUpdate{
Type: updateType,
Data: data,
}
}
func (c *Client) ProcessUpdates() (err error) {
defer c.close()
var (
message []byte
)
for {
_, message, err = c.ws.ReadMessage()
if err != nil {
c.server.opts.logger.Error(fmt.Sprintf("Error Reading Message: %s. RemoteAddr: %s", err, c.ws.RemoteAddr().String()))
return
}
var update *Update
jsonErr := json.Unmarshal(message, &update)
if jsonErr != nil {
c.server.opts.logger.Error(fmt.Sprintf("Error Unmarshalling Request: %s. Data: %s. RemoteAddr: %s", jsonErr, message, c.ws.RemoteAddr().String()))
continue
}
if update.Type == "" {
c.server.opts.logger.Error(fmt.Sprintf("Error Due to Empty Update Type. Data: %s. RemoteAddr: %s", message, c.ws.RemoteAddr().String()))
continue
}
// Check if there's a default handler registered for the updateType and call it
// If any handlers found, the update will be processed by that handler and won't be passed to the updates channel
c.handlersLocker.Lock()
if handler, ok := c.handlers[update.Type]; ok {
c.handlersLocker.Unlock()
handler(update.Data)
continue
}
c.handlersLocker.Unlock()
c.updates <- update
}
}
// HandleUpdate registers a default handler for updateType
// Care: If you use this method for an updateType, you won't receive the respected update in your listener
func (c *Client) HandleUpdate(updateType string, handler func(message json.RawMessage)) {
c.handlersLocker.Lock()
defer c.handlersLocker.Unlock()
c.handlers[updateType] = handler
}
func (c *Client) Updates() chan *Update {
return c.updates
}
func (c *Client) Server() *Socketify {
return c.server
}
func (c *Client) CloseChannel() chan bool {
return c.closed
}
func (c *Client) close() error {
defer func() {
c.closed <- true
}()
if c.server.storage != nil {
c.server.storage.removeClientByID(c.id)
}
return c.ws.Close()
}