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WSRouter.go
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WSRouter.go
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package main
import (
"encoding/json"
"errors"
"expvar"
"net/http"
"time"
"github.com/gorilla/websocket"
)
var (
// MessageSendInterval determines how often we'll send batches of updates
MessageSendInterval = 1000 * time.Millisecond
// ShowOwnAgent determines if messages for my view can include myself if I'm also an agent
ShowOwnAgent = true // TODO LATER handle false too...
activeConnections *expvar.Int
)
var (
// ErrAgentExists is returned if the Agent ID is already used
ErrAgentExists = errors.New("Agent ID already exists")
// ErrViewExists is returned if the View ID is already used
ErrViewExists = errors.New("View ID already exists")
// ErrInvalidMessage is returned if the json message can't be parsed
ErrInvalidMessage = errors.New("Invalid message format")
)
// WSRouter holds what a WS handler needs to work
type WSRouter struct {
db *GeeoDB
whw *WebhookWriter
}
// NewWSRouter returns a new WSRouter
func NewWSRouter(db *GeeoDB, whw *WebhookWriter) *WSRouter {
newwsh := WSRouter{db: db, whw: whw}
activeConnections = expvar.NewInt("active_connections")
return &newwsh
}
func (wsh *WSRouter) handle(upgrader websocket.Upgrader) func(http.ResponseWriter, *http.Request) {
// handle a new websocket Connection
// if the token is sent and is valid, we'll proceed
// this function runs in its own goroutine. If it ever ends, the connection is dropped
return func(res http.ResponseWriter, req *http.Request) {
var identity string
activeConnections.Add(1)
defer func() {
activeConnections.Add(-1)
}()
conn, err := upgrader.Upgrade(res, req, nil)
if err != nil {
log.Warn("upgrade error: ", err)
return
}
t := req.Header.Get("X-GEEO-TOKEN")
if t == "" {
t = req.URL.Query().Get("token")
}
token, err := parseJWTToken(t)
if err != nil {
message := struct {
Error string `json:"error"`
Message string `json:"message"`
}{"Can't parse token, or token invalid", err.Error()}
conn.WriteJSON(message)
log.Warn("Can't parse token, or token invalid: ", err.Error())
return
}
// TODO LATER connectionWebHook
var agent *Agent
var view *View
capabilities := token.Capabilities
// TODO check MaxView and MaxAirBeacon
wsConn := newWSConn(conn)
if capabilities.Produce {
agent = wsh.db.addAgent(token.AgentID, wsConn, token.Public)
identity = "agent:" + token.AgentID
}
if capabilities.Consume {
view = wsh.db.addView(token.ViewID, wsConn)
identity = "view:" + token.ViewID
}
if capabilities.Produce && capabilities.Consume {
identity = "agent:" + token.AgentID + "+view:" + token.ViewID
}
log.Debug("login: ", identity)
wsConn.Name = identity
defer func() {
if err := recover(); err != nil {
log.Error(err)
}
log.Debug("logout: ", identity)
if agent != nil {
wsh.db.removeAgent(*agent.ID)
wsh.handleAgentLeft(agent)
}
if view != nil {
wsh.db.removeView(token.ViewID)
}
wsConn.close()
// TODO LATER defer deconnectionWebHook
}()
// we'll use a single JSONCommand for this socket to limit allocations
// command.clear() must be called before parsing a new command
command := JSONCommand{}
for {
_, jsonString, err := conn.ReadMessage()
if err != nil {
if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
return
}
if websocket.IsCloseError(err, websocket.CloseMessageTooBig) {
wsConn.writeImmediateJSON(struct {
Error string `json:"error"`
Message string `json:"message"`
}{"Message too large", "Your message size exceeds geeo's limits"})
log.Warn(identity, ": Message too large")
// TODO LATER monitor read error rate
return
}
log.Warn(identity, ": ", err.Error())
return
}
command.clear()
if err := json.Unmarshal(jsonString, &command); err != nil {
wsConn.writeImmediateJSON(struct {
Error string `json:"error"`
Message string `json:"message"`
}{"Can't parse command (" + string(jsonString) + ")", err.Error()})
log.Warn(identity, ": invalid JSON command")
}
if err := command.check(); err != nil {
wsConn.writeImmediateJSON(struct {
Error string `json:"error"`
Message string `json:"message"`
}{"Invalid Command (" + string(jsonString) + ")", err.Error()})
log.Warn(identity, ": invalid command")
}
log.Debug(identity, ": ", string(jsonString))
if command.AgentPosition != nil && capabilities.Produce {
wsh.handleAgentMove(agent, command.AgentPosition)
// TODO LATER monitor move rate
}
if command.ViewPosition != nil && capabilities.Consume {
viewSize := command.ViewPosition.Size()
if viewSize[0] > capabilities.MaxView[0] || viewSize[1] > capabilities.MaxView[1] {
wsConn.writeImmediateJSON(struct {
Error string `json:"error"`
}{"View size error: it can't be larger than what your JWT Token allows"})
log.Warn(identity, ": View size error")
} else {
//view.ws.Flush()
wsh.handleViewMove(view, command.ViewPosition)
// TODO LATER monitor move rate
}
}
if command.AgentPublicData != nil && capabilities.Produce {
wsh.handleAgentPublicData(agent, command.AgentPublicData)
// TODO LATER monitor change rate
}
if command.CreatePOI != nil && capabilities.POI {
var creator *string
if agent != nil {
creator = agent.ID
}
wsh.handlePOICreate(command.CreatePOI.ID, command.CreatePOI.Pos, command.CreatePOI.PublicData, creator)
}
if command.RemovePOI != nil && capabilities.POI {
var user *string
if agent != nil {
user = agent.ID
}
wsh.handlePOIRemove(command.RemovePOI.ID, user)
}
if command.CreateAirBeacon != nil && capabilities.AirBeacon {
abSize := command.CreateAirBeacon.Pos.Size()
if abSize[0] > capabilities.MaxAirBeacon[0] || abSize[1] > capabilities.MaxAirBeacon[1] {
wsConn.writeImmediateJSON(struct {
Error string `json:"error"`
}{"Air Beacon size error: it can't be larger than what your JWT Token allows"})
log.Warn(identity, ": AirBeacon size error")
} else {
var creator *string
if agent != nil {
creator = agent.ID
}
wsh.handleAirBeaconCreate(command.CreateAirBeacon.ID, command.CreateAirBeacon.Pos, command.CreateAirBeacon.PublicData, creator)
}
}
if command.RemoveAirBeacon != nil && capabilities.AirBeacon {
var user *string
if agent != nil {
user = agent.ID
}
wsh.handleAirBeaconRemove(command.RemoveAirBeacon.ID, user)
}
// TODO LATER log errors trying to perform action without capabilities
}
}
}