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
|
package internal
import (
"os"
"sync"
j "github.com/json-iterator/go"
"github.com/spiral/errors"
"github.com/spiral/goridge/v3/pkg/frame"
"github.com/spiral/goridge/v3/pkg/relay"
)
var json = j.ConfigCompatibleWithStandardLibrary
type StopCommand struct {
Stop bool `json:"stop"`
}
type pidCommand struct {
Pid int `json:"pid"`
}
var fPool = sync.Pool{New: func() interface{} {
return frame.NewFrame()
}}
func getFrame() *frame.Frame {
return fPool.Get().(*frame.Frame)
}
func putFrame(f *frame.Frame) {
f.Reset()
fPool.Put(f)
}
func SendControl(rl relay.Relay, payload interface{}) error {
const op = errors.Op("send_control")
fr := getFrame()
defer putFrame(fr)
fr.WriteVersion(fr.Header(), frame.VERSION_1)
fr.WriteFlags(fr.Header(), frame.CONTROL)
if data, ok := payload.([]byte); ok {
// check if payload no more that 4Gb
if uint32(len(data)) > ^uint32(0) {
return errors.E(op, errors.Str("payload is more that 4gb"))
}
fr.WritePayloadLen(fr.Header(), uint32(len(data)))
fr.WritePayload(data)
fr.WriteCRC(fr.Header())
err := rl.Send(fr)
if err != nil {
return errors.E(op, err)
}
return nil
}
data, err := json.Marshal(payload)
if err != nil {
return errors.E(op, errors.Errorf("invalid payload: %s", err))
}
fr.WritePayloadLen(fr.Header(), uint32(len(data)))
fr.WritePayload(data)
fr.WriteCRC(fr.Header())
// we don't need a copy here, because frame copy the data before send
err = rl.Send(fr)
if err != nil {
return errors.E(op, err)
}
return nil
}
func Pid(rl relay.Relay) (int64, error) {
const op = errors.Op("fetch_pid")
err := SendControl(rl, pidCommand{Pid: os.Getpid()})
if err != nil {
return 0, errors.E(op, err)
}
fr := getFrame()
defer putFrame(fr)
err = rl.Receive(fr)
if !fr.VerifyCRC(fr.Header()) {
return 0, errors.E(op, errors.Str("CRC mismatch"))
}
if err != nil {
return 0, errors.E(op, err)
}
if fr == nil {
return 0, errors.E(op, errors.Str("nil frame received"))
}
flags := fr.ReadFlags()
if flags&frame.CONTROL == 0 {
return 0, errors.E(op, errors.Str("unexpected response, header is missing, no CONTROL flag"))
}
link := &pidCommand{}
err = json.Unmarshal(fr.Payload(), link)
if err != nil {
return 0, errors.E(op, err)
}
if link.Pid <= 0 {
return 0, errors.E(op, errors.Str("pid should be greater than 0"))
}
return int64(link.Pid), nil
}
|
