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connection.go
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connection.go
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package socketify
import (
"encoding/json"
"errors"
"fmt"
"github.com/gorilla/websocket"
"net/http"
"sync"
"time"
)
type Connection struct {
*writer
id string
server *Server
ws *websocket.Conn
internalUpdates chan []byte
handlers map[string]func(json.RawMessage)
rawHandler func(message []byte)
handlersLocker sync.Mutex
upgradeRequest *http.Request
closed chan bool
attributes map[string]interface{}
attributesLocker sync.Mutex
onClose func()
keepAlive time.Duration
middleware func(message []byte) error
middlewareForUpdate func(updateType string, data json.RawMessage) error
clientErrors chan error
}
func newConnection(server *Server, ws *websocket.Conn, upgradeRequest *http.Request, clientID string) (c *Connection) {
wr := make(chan messageType)
c = &Connection{
id: clientID,
server: server,
ws: ws,
writer: newWriter(wr, server.opts.logger),
handlers: map[string]func(message json.RawMessage){},
closed: make(chan bool),
upgradeRequest: upgradeRequest,
attributes: map[string]interface{}{},
internalUpdates: make(chan []byte),
clientErrors: make(chan error),
}
go c.processWriter(ws)
return
}
func (c *Connection) SetKeepAliveDuration(keepAlive time.Duration) {
c.keepAlive = keepAlive
}
func (c *Connection) SetMiddleware(middleware func(message []byte) error) {
c.middleware = middleware
}
func (c *Connection) SetUpdateTypeMiddleware(middleware func(updateType string, data json.RawMessage) error) {
c.middlewareForUpdate = middleware
}
func (c *Connection) ID() string {
return c.id
}
func (c *Connection) SetOnClose(onClose func()) {
c.onClose = onClose
}
func (c *Connection) SetAttribute(key string, val interface{}) {
c.attributesLocker.Lock()
defer c.attributesLocker.Unlock()
c.attributes[key] = val
}
func (c *Connection) GetAttribute(key string) (val interface{}, exists bool) {
c.attributesLocker.Lock()
defer c.attributesLocker.Unlock()
val, exists = c.attributes[key]
return
}
func (c *Connection) UpgradeRequest() *http.Request {
return c.upgradeRequest
}
func (c *Connection) Errors() <-chan error {
return c.clientErrors
}
func (c *Connection) ProcessUpdates() error {
errChan := make(chan error)
go c.handleIncomingUpdates(errChan)
select {
case err := <-errChan:
go c.close()
return err
case <-c.closed:
return errors.New("connection_closed")
}
}
func (c *Connection) InternalUpdates() <-chan []byte {
return c.internalUpdates
}
// HandleRawUpdate registers a default handler for update
// Note: Add a raw handler if you don't want to follow the API convention {"type": "", "data": {}}
func (c *Connection) HandleRawUpdate(handler func(message []byte)) {
c.handlersLocker.Lock()
defer c.handlersLocker.Unlock()
c.rawHandler = handler
}
// 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 *Connection) HandleUpdate(updateType string, handler func(message json.RawMessage)) {
c.handlersLocker.Lock()
defer c.handlersLocker.Unlock()
c.handlers[updateType] = handler
}
func (c *Connection) Server() *Server {
return c.server
}
func (c *Connection) Close() error {
return c.close()
}
func (c *Connection) reportError(err error) {
go func() {
c.clientErrors <- err
}()
}
func (c *Connection) handleIncomingUpdates(errChannel chan error) {
var (
message []byte
err error
)
if c.keepAlive > 0 {
c.ws.SetReadDeadline(time.Now().Add(c.keepAlive))
c.ws.SetPingHandler(func(d string) error {
c.ws.SetReadDeadline(time.Now().Add(c.keepAlive))
return c.ws.WriteMessage(websocket.PongMessage, nil)
})
c.ws.SetPongHandler(func(d string) error {
return c.ws.SetReadDeadline(time.Now().Add(c.keepAlive))
})
go c.ping()
}
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()))
errChannel <- err
c.reportError(err)
return
}
if c.middleware != nil {
if err = c.middleware(message); err != nil {
c.server.opts.logger.Error(fmt.Sprintf("Error From Middleware: %s. RemoteAddr: %s", err, c.ws.RemoteAddr().String()))
c.reportError(err)
continue
}
}
c.handlersLocker.Lock()
if c.rawHandler != nil {
c.rawHandler(message)
c.handlersLocker.Unlock()
continue
}
c.handlersLocker.Unlock()
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()))
c.reportError(jsonErr)
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()))
c.reportError(errors.New("empty update type"))
continue
}
if c.middlewareForUpdate != nil {
if err := c.middlewareForUpdate(update.Type, update.Data); err != nil {
c.server.opts.logger.Error(fmt.Sprintf("Error From Middleware: %s. RemoteAddr: %s", err, c.ws.RemoteAddr().String()))
c.reportError(err)
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()
}
}
func (c *Connection) close() error {
defer func() {
c.closed <- true
}()
if c.server.storage != nil {
c.server.storage.removeClientByID(c.id)
}
if c.onClose != nil {
go c.onClose()
}
return c.ws.Close()
}