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
|
package bench
import (
"errors"
"fmt"
"net"
"os"
"os/exec"
"time"
"github.com/urfave/cli/v2"
"gitlab.com/gitlab-org/gitaly/v15/internal/helper/perm"
)
// Coordinator starts and stops Gitaly when directed by the client.
type Coordinator struct {
Listener net.Listener
StartCmd []string
StopCmd []string
rw *jsonRW
}
// RunCoordinator executes the coordinator role of gitaly-bench.
func RunCoordinator(ctx *cli.Context) error {
l, err := net.Listen("tcp", ":"+ctx.String("coord-port"))
if err != nil {
return fmt.Errorf("coordinator: listen: %w", err)
}
defer l.Close()
return newCoordinator(l).run()
}
func newCoordinator(listener net.Listener) *Coordinator {
// We deliberately leave `rw` uninitialized until the connection is established.
return &Coordinator{
Listener: listener,
StartCmd: []string{"/usr/bin/systemctl", "start", "gitaly"},
StopCmd: []string{"/usr/bin/systemctl", "stop", "gitaly"},
rw: nil,
}
}
func (c *Coordinator) run() error {
for {
conn, err := c.Listener.Accept()
if err != nil {
return fmt.Errorf("coordinator: accept: %w", err)
}
defer conn.Close()
c.rw = newJSONRW(conn)
done, err := c.session()
if err != nil {
return fmt.Errorf("coordinator: session: %w", err)
}
if done {
return nil
}
}
}
func (c *Coordinator) session() (bool, error) {
for {
cmd, err := c.readCmd()
if err != nil {
return false, err
}
switch cmd.Action {
case startGitalyAction:
if err := c.runBench(cmd); err != nil {
c.respErr(err)
return false, err
}
if err := c.respDone(); err != nil {
return false, err
}
case exitCoordAction:
if err := c.respDone(); err != nil {
return false, err
}
return true, nil
case stopGitalyAction:
err := errors.New("received 'stop' command when Gitaly was not running")
c.respErr(err)
return false, err
default:
err := fmt.Errorf("unknown command: %q", cmd.Action)
c.respErr(err)
return false, err
}
}
}
func (c *Coordinator) runBench(cmd *CoordCmd) error {
if err := c.startBench(cmd); err != nil {
_ = c.stopGitaly()
return fmt.Errorf("start benchmarking: %w", err)
}
if err := c.finishBench(); err != nil {
return fmt.Errorf("finish benchmarking: %w", err)
}
return nil
}
func (c *Coordinator) startBench(cmd *CoordCmd) error {
if err := os.MkdirAll(cmd.OutDir, perm.PrivateDir); err != nil {
return fmt.Errorf("failed to create output directory %q: %w", cmd.OutDir, err)
}
if err := c.startGitaly(); err != nil {
return err
}
// Let Gitaly warm up.
time.Sleep(5 * time.Second)
return c.respDone()
}
func (c *Coordinator) finishBench() error {
cmd, err := c.readCmd()
if err != nil {
_ = c.stopGitaly()
return err
}
if cmd.Action != stopGitalyAction {
_ = c.stopGitaly()
return errors.New("received command other than 'stop' while Gitaly was running")
}
return c.stopGitaly()
}
func (c *Coordinator) readCmd() (*CoordCmd, error) {
var cmd CoordCmd
if err := c.rw.decoder.Decode(&cmd); err != nil {
return nil, fmt.Errorf("read command: %w", err)
}
return &cmd, nil
}
func (c *Coordinator) respDone() error {
resp := CoordResp{}
if err := c.rw.encoder.Encode(resp); err != nil {
return fmt.Errorf("write response: %w", err)
}
return nil
}
func (c *Coordinator) respErr(err error) {
resp := CoordResp{
Error: err.Error(),
}
// We're already in a bad state and about to exit,
// ignore additional errors.
_ = c.rw.encoder.Encode(resp)
}
func (c *Coordinator) startGitaly() error {
cmd := exec.Command(c.StartCmd[0], c.StartCmd[1:]...)
if err := cmd.Run(); err != nil {
return fmt.Errorf("start gitaly: %w", err)
}
return nil
}
func (c *Coordinator) stopGitaly() error {
cmd := exec.Command(c.StopCmd[0], c.StopCmd[1:]...)
if err := cmd.Run(); err != nil {
return fmt.Errorf("stop gitaly: %w", err)
}
return nil
}
|
