Repository navigation
Expand file tree
/
Copy pathcluster.go
More file actions
215 lines (151 loc) · 3.62 KB
/
Copy pathcluster.go
File metadata and controls
215 lines (151 loc) · 3.62 KB
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
package fog
import (
"context"
"fmt"
"io"
"net"
"net/http"
"os"
"github.com/charmbracelet/log"
"github.com/hashicorp/mdns"
"golang.org/x/sync/errgroup"
)
// Cluster is a cluster of virtual machines.
type Cluster struct {
conf *Config
r *ImageRepository
machines []*Machine
imdsSrv *http.Server
mdnsSrvs []*mdns.Server
}
func NewCluster(conf *Config, r *ImageRepository) *Cluster {
return &Cluster{
conf: conf,
r: r,
}
}
func (c *Cluster) Init(ctx context.Context) error {
err := c.r.LoadManifests()
if err != nil {
return err
}
eg, ctx := errgroup.WithContext(ctx)
for n, m := range c.conf.Machines {
n := n
m := m
eg.Go(func() error {
img, err := c.r.Find(ctx, m.Image)
if err != nil {
return err
}
p := c.r.ImagePath(img)
c.machines = append(c.machines, NewMachine(n, m, img, p))
return c.r.Pull(ctx, img, ImagePullOptions{})
})
}
if err = eg.Wait(); err != nil {
return err
}
return nil
}
func (c *Cluster) Start(ctx context.Context) error {
eg, ctx := errgroup.WithContext(ctx)
portChan := make(chan int)
eg.Go(func() error {
return c.startImdsServer(portChan)
})
port := <-portChan
log.Debug("Started IMDS server", "port", port)
mux := NewLogMux(ctx, os.Stderr)
log.Debug("Opened mux logger")
out := mux.Stream("qemu")
opts := &StartOptions{
imdsPort: port,
output: out,
}
for _, m := range c.machines {
m := m
err := m.Start(ctx, opts)
if err != nil {
return fmt.Errorf("starting machine %s: %w", m.Name, err)
}
eg.Go(func() error {
return m.cmd.Wait()
})
}
for _, m := range c.machines {
m := m
s := mux.Stream(m.Name)
log.Debug("Created stream", "name", m.Name)
eg.Go(func() error {
c, err := m.Conn()
log.Debug("Opened machine connection", "name", m.Name)
if err != nil {
return fmt.Errorf("getting machine socket connection: %w", err)
}
io.Copy(s, c)
return nil
})
}
err := c.startMdnsServers()
if err != nil {
return fmt.Errorf("starting Mdns server: %w", err)
}
log.Debug("Started MDNS server")
<-ctx.Done()
return ctx.Err()
}
func (c *Cluster) Shutdown(ctx context.Context) (err error) {
err = c.imdsSrv.Shutdown(ctx)
if err != nil {
return fmt.Errorf("shutting down IMDS server: %w", err)
}
for _, s := range c.mdnsSrvs {
// preserve the first error
if err == nil {
err = s.Shutdown()
} else {
s.Shutdown()
}
}
return err
}
func (c *Cluster) startImdsServer(portChan chan<- int) error {
imds := NewImdsSever(c.machines)
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return fmt.Errorf("opening IMDS server TCP connection: %w", err)
}
port := l.Addr().(*net.TCPAddr).Port
portChan <- port
srv := &http.Server{Handler: imds}
c.imdsSrv = srv
return srv.Serve(l)
}
func (c *Cluster) startMdnsServers() error {
for _, m := range c.machines {
// TODO: loop through ports to find services and port bindings instead of hardcoding SSH
// The format is: [tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport
username := m.Img.Username
if username == "" {
username = m.Img.Name
}
txt := []string{
fmt.Sprintf("fog=%s", m.Name),
fmt.Sprintf("u=%s", username),
}
if pw, ok := m.Conf.CloudConfig["password"]; ok {
txt = append(txt, fmt.Sprintf("p=%s", pw))
}
svc, err := mdns.NewMDNSService(m.Name, "_ssh._tcp", "", "", 2222, nil, txt)
if err != nil {
return fmt.Errorf("creating mdns service: %w", err)
}
server, err := mdns.NewServer(&mdns.Config{Zone: svc})
if err != nil {
return fmt.Errorf("creating mdns server: %w", err)
}
c.mdnsSrvs = append(c.mdnsSrvs, server)
}
return nil
}