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package agent
import (
"encoding/json"
"io/ioutil"
"net/http"
"github.com/gin-gonic/gin"
"github.com/iotbzh/xds-agent/lib/apiv1"
common "github.com/iotbzh/xds-common/golib"
uuid "github.com/satori/go.uuid"
)
var execCmdID = 1
var fwdFuncID []uuid.UUID
// ExecCmd executes remotely a command
func (s *APIService) execCmd(c *gin.Context) {
s._execRequest("/exec", c)
}
// execSignalCmd executes remotely a command
func (s *APIService) execSignalCmd(c *gin.Context) {
s._execRequest("/signal", c)
}
func (s *APIService) _execRequest(cmd string, c *gin.Context) {
data, err := c.GetRawData()
if err != nil {
common.APIError(c, err.Error())
}
args := apiv1.ExecArgs{}
// XXX - we cannot use c.BindJSON, so directly unmarshall it
// (see https://github.com/gin-gonic/gin/issues/1078)
if err := json.Unmarshal(data, &args); err != nil {
common.APIError(c, "Invalid arguments")
return
}
// First get Project ID to retrieve Server ID and send command to right server
iid := c.Param("id")
if iid == "" {
iid = args.ID
}
id, err := s.projects.ResolveID(iid)
if err != nil {
common.APIError(c, err.Error())
return
}
prj := s.projects.Get(id)
if prj == nil {
common.APIError(c, "Unknown id")
return
}
svr := (*prj).GetServer()
if svr == nil {
common.APIError(c, "Cannot identify XDS Server")
return
}
// Retrieve session info
sess := s.sessions.Get(c)
if sess == nil {
common.APIError(c, "Unknown sessions")
return
}
sock := sess.IOSocket
if sock == nil {
common.APIError(c, "Websocket not established")
return
}
// Forward XDSServer WS events to client WS
// TODO removed static event name list and get it from XDSServer
evtList := []string{
apiv1.ExecInEvent,
apiv1.ExecOutEvent,
apiv1.ExecInferiorInEvent,
apiv1.ExecInferiorOutEvent,
}
for _, evName := range evtList {
evN := evName
fwdFunc := func(pData interface{}, evData interface{}) error {
sid := pData.(string)
// IO socket can be nil when disconnected
so := s.sessions.IOSocketGet(sid)
if so == nil {
s.Log.Infof("%s not emitted: WS closed (sid:%s)", evN, sid)
return nil
}
// Forward event to Client/Dashboard
(*so).Emit(evN, evData)
return nil
}
id, err := svr.EventOn(evN, sess.ID, fwdFunc)
if err != nil {
common.APIError(c, err.Error())
return
}
fwdFuncID = append(fwdFuncID, id)
}
// Handle Exit event separately to cleanup registered listener
var exitFuncID uuid.UUID
exitFunc := func(pData interface{}, evData interface{}) error {
evN := apiv1.ExecExitEvent
sid := pData.(string)
// IO socket can be nil when disconnected
so := s.sessions.IOSocketGet(sid)
if so == nil {
s.Log.Infof("%s not emitted: WS closed (sid:%s)", evN, sid)
return nil
}
(*so).Emit(evN, evData)
// cleanup listener
for i, evName := range evtList {
svr.EventOff(evName, fwdFuncID[i])
}
svr.EventOff(evN, exitFuncID)
return nil
}
exitFuncID, err = svr.EventOn(apiv1.ExecExitEvent, sess.ID, exitFunc)
if err != nil {
common.APIError(c, err.Error())
return
}
// Forward back command to right server
response, err := svr.SendCommand(cmd, data)
if err != nil {
common.APIError(c, err.Error())
return
}
// Decode response
body, err := ioutil.ReadAll(response.Body)
if err != nil {
common.APIError(c, "Cannot read response body")
return
}
c.JSON(http.StatusOK, string(body))
}
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