-
Notifications
You must be signed in to change notification settings - Fork 13
/
main.go
98 lines (83 loc) · 2.94 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
// +build linux
// ebpf_exporter - A Prometheus exporter for Linux block IO statistics.
//
// Copyright 2018 Daniel Swarbrick
// 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"
"net/http"
"os"
"github.com/go-kit/kit/log/level"
"github.com/iovisor/gobpf/bcc"
"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"
"gopkg.in/alecthomas/kingpin.v2"
)
const namespace = "ebpf"
var (
listenAddress = kingpin.Flag("web.listen-address", "The address to listen on for HTTP requests.").Default(":9123").String()
)
func main() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print("ebpf_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
level.Info(logger).Log("msg", "Starting ebpf_exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", version.BuildContext())
// Compile BPF code and return new module
m := bcc.NewModule(bpfSource, []string{})
defer m.Close()
// Map of kprobe names from our BPF program to kernel function names, to which to attach.
kprobes := map[string]string{
"trace_req_start": "blk_account_io_start",
"trace_req_completion": "blk_account_io_completion",
}
// Load kprobes and attach them to kernel functions
for kpName, fnName := range kprobes {
if kp, err := m.LoadKprobe(kpName); err == nil {
if err := m.AttachKprobe(fnName, kp); err != nil {
fmt.Fprintf(os.Stderr, "Failed to attach %q to %q: %s\n", kpName, fnName, err)
os.Exit(1)
}
} else {
fmt.Fprintf(os.Stderr, "Failed to load %q: %s\n", kpName, err)
os.Exit(1)
}
}
prometheus.MustRegister(newExporter(m))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(`<html>
<head>
<title>eBPF Exporter</title>
<style>html { font-family: sans-serif; }</style>
</head>
<body>
<h1>eBPF Exporter</h1>
<p><a href="/metrics">Metrics</a></p>
</body>
</html>`))
})
http.Handle("/metrics", promhttp.Handler())
level.Info(logger).Log("msg", "Listening on address", "address", *listenAddress)
if err := http.ListenAndServe(*listenAddress, nil); err != nil {
level.Error(logger).Log("msg", "Error starting HTTP server", "err", err)
os.Exit(1)
}
}