-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathweb.go
94 lines (86 loc) · 2.7 KB
/
web.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
// Copyright 2017 Teralytics.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"log"
"net/http"
"strings"
"time"
)
type metricsElement struct {
Name string
Mountpoint string
Value float64
}
func (m metricsElement) String() string {
mt := strings.Replace(
strings.Replace(
strings.Replace(m.Mountpoint, "\\", "\\\\", -1),
"\n", "\\n", -1), "\"", "\\\"", -1)
return fmt.Sprintf("%s {mountpoint=\"%s\"} %f\n", m.Name, mt, m.Value)
}
func boolToFloat(b bool) float64 {
if b {
return 1.0
}
return 0.0
}
type metricsHandler struct {
timeout time.Duration
fsTypes []string
optReadFile string
}
func (m *metricsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
fses := DiscoverFilesystems("/proc/mounts", m.fsTypes)
fslist := []*FilesystemChecker{}
for _, fs := range fses {
fslist = append(fslist, &FilesystemChecker{fs})
}
waits := make(map[*FilesystemChecker]func() *LivenessCheck)
for _, fs := range fslist {
waits[fs] = fs.Check(m.timeout, m.optReadFile)
}
for _, fs := range fslist {
check := waits[fs]()
for _, elm := range []*metricsElement{
&metricsElement{"vfs_filesystem_error", fs.mountpoint, boolToFloat(check.err)},
&metricsElement{"vfs_filesystem_live", fs.mountpoint, boolToFloat(check.live)},
&metricsElement{"vfs_filesystem_scan_duration_seconds", fs.mountpoint, check.duration},
} {
fmt.Fprintf(w, "%s", elm)
}
}
}
func Server(listenAddr string, collectTimeout time.Duration, fsTypes []string, optReadFile string) {
log.Printf("Serving status and metrics on address %s", listenAddr)
srv := &http.Server{
Addr: listenAddr,
ReadTimeout: 5 * time.Second,
WriteTimeout: (5 * time.Second) + collectTimeout,
MaxHeaderBytes: 4096,
}
http.Handle("/metrics", &metricsHandler{collectTimeout, fsTypes, optReadFile})
//http.HandleFunc("/quitquitquit", func(http.ResponseWriter, *http.Request) { os.Exit(0) })
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>File system liveness exporter</title></head>
<body>
<H1>File system liveness exporter</H1>
<p><a href="/metrics">Metrics</a></p>
</body>
</html>`))
})
srv.ListenAndServe()
}