forked from percona/mongodb_exporter
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mongodb_exporter.go
189 lines (162 loc) · 5.72 KB
/
mongodb_exporter.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
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
package main
import (
"crypto/tls"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
"github.com/percona/mongodb_exporter/collector"
"github.com/percona/mongodb_exporter/shared"
"github.com/prometheus/client_golang/prometheus"
"gopkg.in/yaml.v2"
)
func mongodbDefaultUri() string {
if u := os.Getenv("MONGODB_URL"); u != "" {
return u
}
return "mongodb://localhost:27017"
}
var (
version string = "unknown"
versionGitCommit string = "unknown"
doPrintVersion = flag.Bool("version", false, "Print version info and exit.")
listenAddressFlag = flag.String("web.listen-address", ":9104", "Address on which to expose metrics and web interface.")
metricsPathFlag = flag.String("web.metrics-path", "/metrics", "Path under which to expose metrics.")
webAuthFile = flag.String("web.auth-file", "", "Path to YAML file with server_user, server_password options for http basic auth (overrides HTTP_AUTH env var).")
sslCertFile = flag.String("web.ssl-cert-file", "", "Path to SSL certificate file.")
sslKeyFile = flag.String("web.ssl-key-file", "", "Path to SSL key file.")
mongodbURIFlag = flag.String("mongodb.uri", mongodbDefaultUri(), "Mongodb URI, format: [mongodb://][user:pass@]host1[:port1][,host2[:port2],...][/database][?options]")
enabledGroupsFlag = flag.String("groups.enabled", "asserts,durability,background_flushing,connections,extra_info,global_lock,index_counters,network,op_counters,op_counters_repl,memory,locks,metrics", "Comma-separated list of groups to use, for more info see: docs.mongodb.org/manual/reference/command/serverStatus/")
)
var landingPage = []byte(`<html>
<head><title>MongoDB exporter</title></head>
<body>
<h1>MongoDB exporter</h1>
<p><a href='` + *metricsPathFlag + `'>Metrics</a></p>
</body>
</html>
`)
func printVersion() {
fmt.Printf("mongodb_exporter version: %s, git commit hash: %s\n", version, versionGitCommit)
}
type webAuth struct {
User string `yaml:"server_user,omitempty"`
Password string `yaml:"server_password,omitempty"`
}
type basicAuthHandler struct {
handler http.HandlerFunc
user string
password string
}
func (h *basicAuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
user, password, ok := r.BasicAuth()
if !ok || password != h.password || user != h.user {
w.Header().Set("WWW-Authenticate", "Basic realm=\"metrics\"")
http.Error(w, "Invalid username or password", http.StatusUnauthorized)
return
}
h.handler(w, r)
return
}
func prometheusHandler() http.Handler {
cfg := &webAuth{}
httpAuth := os.Getenv("HTTP_AUTH")
if *webAuthFile != "" {
bytes, err := ioutil.ReadFile(*webAuthFile)
if err != nil {
panic(fmt.Sprintf("Cannot read auth file: %s", err))
}
if err := yaml.Unmarshal(bytes, cfg); err != nil {
panic(fmt.Sprintf("Cannot parse auth file: %s", err))
}
} else if httpAuth != "" {
data := strings.SplitN(httpAuth, ":", 2)
if len(data) != 2 || data[0] == "" || data[1] == "" {
panic("HTTP_AUTH should be formatted as user:password")
}
cfg.User = data[0]
cfg.Password = data[1]
}
handler := prometheus.Handler()
if cfg.User != "" && cfg.Password != "" {
handler = &basicAuthHandler{handler: handler.ServeHTTP, user: cfg.User, password: cfg.Password}
fmt.Println("HTTP basic authentication is enabled")
}
return handler
}
func startWebServer() {
printVersion()
uri := os.Getenv("MONGODB_URI")
if uri != "" {
mongodbURIFlag = &uri
}
handler := prometheusHandler()
registerCollector()
if *sslCertFile != "" && *sslKeyFile == "" || *sslCertFile == "" && *sslKeyFile != "" {
panic("One of the flags -web.ssl-cert or -web.ssl-key is missed to enable HTTPS/TLS")
}
ssl := false
if *sslCertFile != "" && *sslKeyFile != "" {
if _, err := os.Stat(*sslCertFile); os.IsNotExist(err) {
panic(fmt.Sprintf("SSL certificate file does not exist: %s", *sslCertFile))
}
if _, err := os.Stat(*sslKeyFile); os.IsNotExist(err) {
panic(fmt.Sprintf("SSL key file does not exist: %s", *sslKeyFile))
}
ssl = true
fmt.Println("HTTPS/TLS is enabled")
}
fmt.Printf("Listening on %s\n", *listenAddressFlag)
if ssl {
// https
mux := http.NewServeMux()
mux.Handle(*metricsPathFlag, handler)
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
w.Header().Add("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
w.Write(landingPage)
})
tlsCfg := &tls.Config{
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
},
}
srv := &http.Server{
Addr: *listenAddressFlag,
Handler: mux,
TLSConfig: tlsCfg,
TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler), 0),
}
panic(srv.ListenAndServeTLS(*sslCertFile, *sslKeyFile))
} else {
// http
http.Handle(*metricsPathFlag, handler)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write(landingPage)
})
panic(http.ListenAndServe(*listenAddressFlag, nil))
}
}
func registerCollector() {
mongodbCollector := collector.NewMongodbCollector(collector.MongodbCollectorOpts{
URI: *mongodbURIFlag,
})
prometheus.MustRegister(mongodbCollector)
}
func main() {
flag.Parse()
if *doPrintVersion {
printVersion()
os.Exit(0)
}
shared.ParseEnabledGroups(*enabledGroupsFlag)
fmt.Println("### Warning: the exporter is in beta/experimental state and field names are very\n### likely to change in the future and features may change or get removed!\n### See: https://github.com/percona/mongodb_exporter for updates")
startWebServer()
}