/
libmgmt3.go
225 lines (195 loc) · 4.98 KB
/
libmgmt3.go
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
// libmgmt example of send->recv
package main
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/purpleidea/mgmt/gapi"
mgmt "github.com/purpleidea/mgmt/mgmtmain"
"github.com/purpleidea/mgmt/pgraph"
"github.com/purpleidea/mgmt/resources"
)
// MyGAPI implements the main GAPI interface.
type MyGAPI struct {
Name string // graph name
Interval uint // refresh interval, 0 to never refresh
data gapi.Data
initialized bool
closeChan chan struct{}
wg sync.WaitGroup // sync group for tunnel go routines
}
// NewMyGAPI creates a new MyGAPI struct and calls Init().
func NewMyGAPI(data gapi.Data, name string, interval uint) (*MyGAPI, error) {
obj := &MyGAPI{
Name: name,
Interval: interval,
}
return obj, obj.Init(data)
}
// Init initializes the MyGAPI struct.
func (obj *MyGAPI) Init(data gapi.Data) error {
if obj.initialized {
return fmt.Errorf("Already initialized!")
}
if obj.Name == "" {
return fmt.Errorf("The graph name must be specified!")
}
obj.data = data // store for later
obj.closeChan = make(chan struct{})
obj.initialized = true
return nil
}
// Graph returns a current Graph.
func (obj *MyGAPI) Graph() (*pgraph.Graph, error) {
if !obj.initialized {
return nil, fmt.Errorf("libmgmt: MyGAPI is not initialized")
}
g := pgraph.NewGraph(obj.Name)
content := "Delete me to trigger a notification!\n"
f0 := &resources.FileRes{
BaseRes: resources.BaseRes{
Name: "README",
},
Path: "/tmp/mgmt/README",
Content: &content,
State: "present",
}
v0 := pgraph.NewVertex(f0)
g.AddVertex(v0)
p1 := &resources.PasswordRes{
BaseRes: resources.BaseRes{
Name: "password1",
},
Length: 8, // generated string will have this many characters
Saved: true, // this causes passwords to be stored in plain text!
}
v1 := pgraph.NewVertex(p1)
g.AddVertex(v1)
f1 := &resources.FileRes{
BaseRes: resources.BaseRes{
Name: "file1",
// send->recv!
Recv: map[string]*resources.Send{
"Content": &resources.Send{Res: p1, Key: "Password"},
},
},
Path: "/tmp/mgmt/secret",
//Content: p1.Password, // won't work
State: "present",
}
v2 := pgraph.NewVertex(f1)
g.AddVertex(v2)
n1 := &resources.NoopRes{
BaseRes: resources.BaseRes{
Name: "noop1",
},
}
v3 := pgraph.NewVertex(n1)
g.AddVertex(v3)
e0 := pgraph.NewEdge("e0")
e0.Notify = true // send a notification from v0 to v1
g.AddEdge(v0, v1, e0)
g.AddEdge(v1, v2, pgraph.NewEdge("e1"))
e2 := pgraph.NewEdge("e2")
e2.Notify = true // send a notification from v2 to v3
g.AddEdge(v2, v3, e2)
//g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.EmbdEtcd, obj.data.Noop)
return g, nil
}
// SwitchStream returns nil errors every time there could be a new graph.
func (obj *MyGAPI) SwitchStream() chan error {
if obj.data.NoWatch || obj.Interval <= 0 {
return nil
}
ch := make(chan error)
obj.wg.Add(1)
go func() {
defer obj.wg.Done()
defer close(ch) // this will run before the obj.wg.Done()
if !obj.initialized {
ch <- fmt.Errorf("libmgmt: MyGAPI is not initialized")
return
}
// arbitrarily change graph every interval seconds
ticker := time.NewTicker(time.Duration(obj.Interval) * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
log.Printf("libmgmt: Generating new graph...")
ch <- nil // trigger a run
case <-obj.closeChan:
return
}
}
}()
return ch
}
// Close shuts down the MyGAPI.
func (obj *MyGAPI) Close() error {
if !obj.initialized {
return fmt.Errorf("libmgmt: MyGAPI is not initialized")
}
close(obj.closeChan)
obj.wg.Wait()
obj.initialized = false // closed = true
return nil
}
// Run runs an embedded mgmt server.
func Run() error {
obj := &mgmt.Main{}
obj.Program = "libmgmt" // TODO: set on compilation
obj.Version = "0.0.1" // TODO: set on compilation
obj.TmpPrefix = true // disable for easy debugging
//prefix := "/tmp/testprefix/"
//obj.Prefix = &p // enable for easy debugging
obj.IdealClusterSize = -1
obj.ConvergedTimeout = -1
obj.Noop = false // FIXME: careful!
obj.GAPI = &MyGAPI{ // graph API
Name: "libmgmt", // TODO: set on compilation
Interval: 60 * 10, // arbitrarily change graph every 15 seconds
}
if err := obj.Init(); err != nil {
return err
}
// install the exit signal handler
exit := make(chan struct{})
defer close(exit)
go func() {
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt) // catch ^C
//signal.Notify(signals, os.Kill) // catch signals
signal.Notify(signals, syscall.SIGTERM)
select {
case sig := <-signals: // any signal will do
if sig == os.Interrupt {
log.Println("Interrupted by ^C")
obj.Exit(nil)
return
}
log.Println("Interrupted by signal")
obj.Exit(fmt.Errorf("Killed by %v", sig))
return
case <-exit:
return
}
}()
if err := obj.Run(); err != nil {
return err
}
return nil
}
func main() {
log.Printf("Hello!")
if err := Run(); err != nil {
fmt.Println(err)
os.Exit(1)
return
}
log.Printf("Goodbye!")
}