forked from prometheus/graphite_exporter
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
208 lines (187 loc) · 6.84 KB
/
main.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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
// Copyright 2015 The Prometheus Authors
// 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 (
"bufio"
"bytes"
"fmt"
"net"
"net/http"
_ "net/http/pprof"
"os"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"github.com/prometheus/exporter-toolkit/web"
"github.com/prometheus/exporter-toolkit/web/kingpinflag"
"github.com/prometheus/graphite_exporter/collector"
"github.com/prometheus/statsd_exporter/pkg/mapper"
"github.com/prometheus/statsd_exporter/pkg/mappercache/lru"
"github.com/prometheus/statsd_exporter/pkg/mappercache/randomreplacement"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose Prometheus metrics.").Default("/metrics").String()
graphiteAddress = kingpin.Flag("graphite.listen-address", "TCP and UDP address on which to accept samples.").Default(":9109").String()
mappingConfig = kingpin.Flag("graphite.mapping-config", "Metric mapping configuration file name.").Default("").String()
sampleExpiry = kingpin.Flag("graphite.sample-expiry", "How long a sample is valid for.").Default("5m").Duration()
strictMatch = kingpin.Flag("graphite.mapping-strict-match", "Only store metrics that match the mapping configuration.").Bool()
cacheSize = kingpin.Flag("graphite.cache-size", "Maximum size of your metric mapping cache. Relies on least recently used replacement policy if max size is reached.").Default("1000").Int()
cacheType = kingpin.Flag("graphite.cache-type", "Metric mapping cache type. Valid options are \"lru\" and \"random\"").Default("lru").Enum("lru", "random")
dumpFSMPath = kingpin.Flag("debug.dump-fsm", "The path to dump internal FSM generated for glob matching as Dot file.").Default("").String()
checkConfig = kingpin.Flag("check-config", "Check configuration and exit.").Default("false").Bool()
toolkitFlags = kingpinflag.AddFlags(kingpin.CommandLine, ":9108")
)
func init() {
prometheus.MustRegister(version.NewCollector("graphite_exporter"))
}
func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger log.Logger) error {
if mapper.FSM == nil {
return fmt.Errorf("no FSM available to be dumped, possibly because the mapping contains regex patterns")
}
f, err := os.Create(dumpFilename)
if err != nil {
return err
}
level.Info(logger).Log("msg", "Start dumping FSM", "to", dumpFilename)
w := bufio.NewWriter(f)
mapper.FSM.DumpFSM(w)
w.Flush()
f.Close()
level.Info(logger).Log("msg", "Finish dumping FSM")
return nil
}
func main() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print("graphite_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
level.Info(logger).Log("msg", "Starting graphite_exporter", "version_info", version.Info())
level.Info(logger).Log("build_context", version.BuildContext())
http.Handle(*metricsPath, promhttp.Handler())
c := collector.NewGraphiteCollector(logger, *strictMatch, *sampleExpiry)
prometheus.MustRegister(c)
metricMapper := &mapper.MetricMapper{Logger: logger}
if *mappingConfig != "" {
err := metricMapper.InitFromFile(*mappingConfig)
if err != nil {
level.Error(logger).Log("msg", "Error loading metric mapping config", "err", err)
os.Exit(1)
}
}
cache, err := getCache(*cacheSize, *cacheType, prometheus.DefaultRegisterer)
if err != nil {
level.Error(logger).Log("msg", "error initializing mapper cache", "err", err)
os.Exit(1)
}
metricMapper.UseCache(cache)
if *checkConfig {
level.Info(logger).Log("msg", "Configuration check successful, exiting")
return
}
if *dumpFSMPath != "" {
err := dumpFSM(metricMapper, *dumpFSMPath, logger)
if err != nil {
level.Error(logger).Log("msg", "Error dumping FSM", "err", err)
os.Exit(1)
}
}
c.SetMapper(metricMapper)
tcpSock, err := net.Listen("tcp", *graphiteAddress)
if err != nil {
level.Error(logger).Log("msg", "Error binding to TCP socket", "err", err)
os.Exit(1)
}
go func() {
for {
conn, err := tcpSock.Accept()
if err != nil {
level.Error(logger).Log("msg", "Error accepting TCP connection", "err", err)
continue
}
go func() {
defer conn.Close()
c.ProcessReader(conn)
}()
}
}()
udpAddress, err := net.ResolveUDPAddr("udp", *graphiteAddress)
if err != nil {
level.Error(logger).Log("msg", "Error resolving UDP address", "err", err)
os.Exit(1)
}
udpSock, err := net.ListenUDP("udp", udpAddress)
if err != nil {
level.Error(logger).Log("msg", "Error listening to UDP address", "err", err)
os.Exit(1)
}
go func() {
defer udpSock.Close()
for {
buf := make([]byte, 65536)
chars, srcAddress, err := udpSock.ReadFromUDP(buf)
if err != nil {
level.Error(logger).Log("msg", "Error reading UDP packet", "from", srcAddress, "err", err)
continue
}
go c.ProcessReader(bytes.NewReader(buf[0:chars]))
}
}()
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Write([]byte(`<html>
<head><title>Graphite Exporter</title></head>
<body>
<h1>Graphite Exporter</h1>
<p>Accepting plaintext Graphite samples over TCP and UDP on ` + *graphiteAddress + `</p>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body>
</html>`))
})
server := &http.Server{}
if err := web.ListenAndServe(server, toolkitFlags, logger); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}
// TODO(mr): this is copied verbatim from statsd_exporter/main.go. It should be a
// convenience function in mappercache, but that caused an import cycle.
func getCache(cacheSize int, cacheType string, registerer prometheus.Registerer) (mapper.MetricMapperCache, error) {
var cache mapper.MetricMapperCache
var err error
if cacheSize == 0 {
return nil, nil
} else {
switch cacheType {
case "lru":
cache, err = lru.NewMetricMapperLRUCache(registerer, cacheSize)
case "random":
cache, err = randomreplacement.NewMetricMapperRRCache(registerer, cacheSize)
default:
err = fmt.Errorf("unsupported cache type %q", cacheType)
}
if err != nil {
return nil, err
}
}
return cache, nil
}