/
socket_routes.go
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/
socket_routes.go
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package api
import (
"fmt"
"net/http"
"sync"
"time"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
"github.com/kubeshark/kubeshark/agent/pkg/models"
"github.com/kubeshark/kubeshark/agent/pkg/utils"
"github.com/kubeshark/kubeshark/logger"
tapApi "github.com/kubeshark/worker/api"
)
var (
extensionsMap map[string]*tapApi.Extension // global
protocolsMap map[string]*tapApi.Protocol //global
)
func InitMaps(extensions map[string]*tapApi.Extension, protocols map[string]*tapApi.Protocol) {
extensionsMap = extensions
protocolsMap = protocols
}
type EventHandlers interface {
WebSocketConnect(c *gin.Context, socketId int, isTapper bool)
WebSocketDisconnect(socketId int, isTapper bool)
WebSocketMessage(socketId int, isTapper bool, message []byte)
}
type SocketConnection struct {
connection *websocket.Conn
lock *sync.Mutex
eventHandlers EventHandlers
isTapper bool
}
type WebSocketParams struct {
LeftOff string `json:"leftOff"`
Query string `json:"query"`
EnableFullEntries bool `json:"enableFullEntries"`
Fetch int `json:"fetch"`
TimeoutMs int `json:"timeoutMs"`
}
var (
websocketUpgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
websocketIdsLock = sync.Mutex{}
connectedWebsockets map[int]*SocketConnection
connectedWebsocketIdCounter = 0
SocketGetBrowserHandler gin.HandlerFunc
SocketGetTapperHandler gin.HandlerFunc
)
func init() {
websocketUpgrader.CheckOrigin = func(r *http.Request) bool { return true } // like cors for web socket
connectedWebsockets = make(map[int]*SocketConnection)
}
func WebSocketRoutes(app *gin.Engine, eventHandlers EventHandlers) {
SocketGetBrowserHandler = func(c *gin.Context) {
websocketHandler(c, eventHandlers, false)
}
SocketGetTapperHandler = func(c *gin.Context) {
websocketHandler(c, eventHandlers, true)
}
app.GET("/ws", func(c *gin.Context) {
SocketGetBrowserHandler(c)
})
app.GET("/wsTapper", func(c *gin.Context) { // TODO: add m2m authentication to this route
SocketGetTapperHandler(c)
})
}
func websocketHandler(c *gin.Context, eventHandlers EventHandlers, isTapper bool) {
ws, err := websocketUpgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
logger.Log.Errorf("failed to set websocket upgrade: %v", err)
return
}
websocketIdsLock.Lock()
connectedWebsocketIdCounter++
socketId := connectedWebsocketIdCounter
connectedWebsockets[socketId] = &SocketConnection{connection: ws, lock: &sync.Mutex{}, eventHandlers: eventHandlers, isTapper: isTapper}
websocketIdsLock.Unlock()
defer func() {
if socketConnection := connectedWebsockets[socketId]; socketConnection != nil {
socketCleanup(socketId, socketConnection)
}
}()
eventHandlers.WebSocketConnect(c, socketId, isTapper)
startTimeBytes, _ := models.CreateWebsocketStartTimeMessage(utils.StartTime)
if err = SendToSocket(socketId, startTimeBytes); err != nil {
logger.Log.Error(err)
}
for {
_, msg, err := ws.ReadMessage()
if err != nil {
if _, ok := err.(*websocket.CloseError); ok {
logger.Log.Debugf("received websocket close message, socket id: %d", socketId)
} else {
logger.Log.Errorf("error reading message, socket id: %d, error: %v", socketId, err)
}
break
}
eventHandlers.WebSocketMessage(socketId, isTapper, msg)
}
}
func SendToSocket(socketId int, message []byte) error {
socketObj := connectedWebsockets[socketId]
if socketObj == nil {
return fmt.Errorf("socket %v is disconnected", socketId)
}
socketObj.lock.Lock() // gorilla socket panics from concurrent writes to a single socket
defer socketObj.lock.Unlock()
if connectedWebsockets[socketId] == nil {
return fmt.Errorf("socket %v is disconnected", socketId)
}
if err := socketObj.connection.SetWriteDeadline(time.Now().Add(time.Second * 10)); err != nil {
socketCleanup(socketId, socketObj)
return fmt.Errorf("error setting timeout to socket %v, err: %v", socketId, err)
}
if err := socketObj.connection.WriteMessage(websocket.TextMessage, message); err != nil {
socketCleanup(socketId, socketObj)
return fmt.Errorf("failed to write message to socket %v, err: %v", socketId, err)
}
return nil
}
func socketCleanup(socketId int, socketConnection *SocketConnection) {
err := socketConnection.connection.Close()
if err != nil {
logger.Log.Errorf("error closing socket connection for socket id %d: %v", socketId, err)
}
websocketIdsLock.Lock()
connectedWebsockets[socketId] = nil
websocketIdsLock.Unlock()
socketConnection.eventHandlers.WebSocketDisconnect(socketId, socketConnection.isTapper)
}