summaryrefslogtreecommitdiffstats
path: root/lib/agent/apiv1-exec.go
blob: 3cb4d234d51f14ebfc94e1d3ce2d288d09a7e0ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
package agent

import (
	"encoding/json"
	"io/ioutil"
	"net/http"

	"github.com/franciscocpg/reflectme"
	"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"
)

// 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,
	}

	var fwdFuncID []uuid.UUID
	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
			}

			// Add sessionID to event Data
			reflectme.SetField(evData, "sessionID", sid)

			// 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)

		// Add sessionID to event Data
		reflectme.SetField(evData, "sessionID", sid)

		// IO socket can be nil when disconnected
		so := s.sessions.IOSocketGet(sid)
		if so != nil {
			(*so).Emit(evN, evData)
		} else {
			s.Log.Infof("%s not emitted: WS closed (sid:%s)", evN, sid)
		}

		// 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))
}