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
|
package main
import (
"encoding/json"
"io"
"net/http"
"os"
"sync"
"syscall"
)
type startLoggingRequest struct {
File string
}
type capabilitiesResponse struct {
Cap struct {
ReadLogs bool
}
}
type driver struct {
mu sync.Mutex
logs map[string]io.Closer
}
type stopLoggingRequest struct {
File string
}
func handle(mux *http.ServeMux) {
d := &driver{logs: make(map[string]io.Closer)}
mux.HandleFunc("/LogDriver.StartLogging", func(w http.ResponseWriter, r *http.Request) {
var req startLoggingRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
f, err := os.OpenFile(req.File, syscall.O_RDONLY, 0700)
if err != nil {
respond(err, w)
}
d.mu.Lock()
d.logs[req.File] = f
d.mu.Unlock()
go io.Copy(io.Discard, f)
respond(err, w)
})
mux.HandleFunc("/LogDriver.StopLogging", func(w http.ResponseWriter, r *http.Request) {
var req stopLoggingRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
d.mu.Lock()
if f := d.logs[req.File]; f != nil {
f.Close()
}
d.mu.Unlock()
respond(nil, w)
})
mux.HandleFunc("/LogDriver.Capabilities", func(w http.ResponseWriter, r *http.Request) {
json.NewEncoder(w).Encode(&capabilitiesResponse{
Cap: struct{ ReadLogs bool }{ReadLogs: false},
})
})
}
type response struct {
Err string
}
func respond(err error, w io.Writer) {
var res response
if err != nil {
res.Err = err.Error()
}
json.NewEncoder(w).Encode(&res)
}
|
