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# If you prefer the allow list template instead of the deny list, see community template:
# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
#
# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib
# Test binary, built with `go test -c`
*.test
# Code coverage profiles and other test artifacts
*.out
coverage.*
*.coverprofile
profile.cov
# Dependency directories (remove the comment below to include it)
# vendor/
# Go workspace file
go.work
go.work.sum
# env file
.env
# Editor/IDE
# .idea/
# .vscode/
io-exporter

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GNU GENERAL PUBLIC LICENSE
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This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# io-exporter
Report if a given filesystem is operating properly
## Description
This little exporter checks if a filesystem is working properly by
writing and reading to a specified file using direct/io. It reports
the results via HTTP as prometheus metrics. Additional labels can be
specified via commandline.
## Usage
```default
io-exporter [options] <file>
Options:
-t --timeout <int> When should the operation timeout in seconds
-l --label <label=value> Add label to exported metric
-h --help Show help
-v --version Show program version
```
## Output
Given this command:
```default
io-exporter -l foo=bar -l blah=blubb t/blah
```
You'll get such metrics:
```default
# HELP io_exporter_io_latency how long does the operation take in seconds
# TYPE io_exporter_io_latency gauge
io_exporter_io_latency{file="/tmp/blah",maxwait="1",namespace="debug",pod="foo1"} 0.0001142815
# HELP io_exporter_io_operation whether io is working on the pvc, 1=ok, 0=fail
# TYPE io_exporter_io_operation gauge
io_exporter_io_operation{file="/tmp/blah",maxwait="1",namespace="debug",pod="foo1"} 1
```
## Installation
There are no released binaries yet.
### Installation from source
Check out the repository and execute `go build`, then copy the
compiled binary to your `$PATH`.
Or, if you have GNU Make installed, just execute:
```default
go build
```
# Report bugs
[Please open an issue](https://github.com/TLINDEN/io-exporter/issues). Thanks!
# License
This work is licensed under the terms of the General Public Licens
version 3.
# Author
Copyleft (c) 2025 Thomas von Dein

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module github.com/tlinden/io-exporter
go 1.23.5
require (
github.com/knadh/koanf/providers/posflag v1.0.1
github.com/knadh/koanf/v2 v2.3.0
github.com/ncw/directio v1.0.5
github.com/prometheus/client_golang v1.23.2
github.com/spf13/pflag v1.0.10
)
require (
github.com/beorn7/perks v1.0.1 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
github.com/knadh/koanf/maps v0.1.2 // indirect
github.com/kr/text v0.2.0 // indirect
github.com/lmittmann/tint v1.1.2 // indirect
github.com/mitchellh/copystructure v1.2.0 // indirect
github.com/mitchellh/reflectwalk v1.0.2 // indirect
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
github.com/prometheus/client_model v0.6.2 // indirect
github.com/prometheus/common v0.66.1 // indirect
github.com/prometheus/procfs v0.16.1 // indirect
go.yaml.in/yaml/v2 v2.4.2 // indirect
golang.org/x/sys v0.35.0 // indirect
google.golang.org/protobuf v1.36.8 // indirect
)

64
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@@ -0,0 +1,64 @@
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
github.com/knadh/koanf/maps v0.1.2 h1:RBfmAW5CnZT+PJ1CVc1QSJKf4Xu9kxfQgYVQSu8hpbo=
github.com/knadh/koanf/maps v0.1.2/go.mod h1:npD/QZY3V6ghQDdcQzl1W4ICNVTkohC8E73eI2xW4yI=
github.com/knadh/koanf/providers/posflag v1.0.1 h1:EnMxHSrPkYCFnKgBUl5KBgrjed8gVFrcXDzaW4l/C6Y=
github.com/knadh/koanf/providers/posflag v1.0.1/go.mod h1:3Wn3+YG3f4ljzRyCUgIwH7G0sZ1pMjCOsNBovrbKmAk=
github.com/knadh/koanf/v2 v2.3.0 h1:Qg076dDRFHvqnKG97ZEsi9TAg2/nFTa9hCdcSa1lvlM=
github.com/knadh/koanf/v2 v2.3.0/go.mod h1:gRb40VRAbd4iJMYYD5IxZ6hfuopFcXBpc9bbQpZwo28=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
github.com/lmittmann/tint v1.1.2 h1:2CQzrL6rslrsyjqLDwD11bZ5OpLBPU+g3G/r5LSfS8w=
github.com/lmittmann/tint v1.1.2/go.mod h1:HIS3gSy7qNwGCj+5oRjAutErFBl4BzdQP6cJZ0NfMwE=
github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
github.com/ncw/directio v1.0.5 h1:JSUBhdjEvVaJvOoyPAbcW0fnd0tvRXD76wEfZ1KcQz4=
github.com/ncw/directio v1.0.5/go.mod h1:rX/pKEYkOXBGOggmcyJeJGloCkleSvphPx2eV3t6ROk=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9ZoGs=
github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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package main
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"log"
"log/slog"
"net/http"
"os"
"strings"
"time"
"github.com/lmittmann/tint"
flag "github.com/spf13/pflag"
"github.com/knadh/koanf/providers/posflag"
koanf "github.com/knadh/koanf/v2"
"github.com/ncw/directio"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
Version = `v0.0.1`
SLEEP = 5
Usage = `io-exporter [options] <file>
Options:
-t --timeout <int> When should the operation timeout in seconds
-l --label <label=value> Add label to exported metric
-h --help Show help
-v --version Show program version`
)
var (
labels = []string{"file", "maxwait"}
)
type Label struct {
Name, Value string
}
type Config struct {
Showversion bool `koanf:"version"` // -v
Showhelp bool `koanf:"help"` // -h
Label []string `koanf:"label"` // -v
Timeout int `koanf:"timeout"` // -t
Port int `koanf:"port"` // -p
File string
Labels []Label
}
func InitConfig(output io.Writer) (*Config, error) {
var kloader = koanf.New(".")
// setup custom usage
flagset := flag.NewFlagSet("config", flag.ContinueOnError)
flagset.Usage = func() {
_, err := fmt.Fprintln(output, Usage)
if err != nil {
log.Fatalf("failed to print to output: %s", err)
}
}
// parse commandline flags
flagset.BoolP("version", "v", false, "show program version")
flagset.BoolP("help", "h", false, "show help")
flagset.StringArrayP("label", "l", nil, "additional labels")
flagset.IntP("timeout", "t", 1, "timeout for file operation in seconds")
flagset.IntP("port", "p", 9187, "prometheus metrics port to listen to")
if err := flagset.Parse(os.Args[1:]); err != nil {
return nil, fmt.Errorf("failed to parse program arguments: %w", err)
}
// command line setup
if err := kloader.Load(posflag.Provider(flagset, ".", kloader), nil); err != nil {
return nil, fmt.Errorf("error loading flags: %w", err)
}
// fetch values
conf := &Config{}
if err := kloader.Unmarshal("", &conf); err != nil {
return nil, fmt.Errorf("error unmarshalling: %w", err)
}
// arg is the file under test
if len(flagset.Args()) > 0 {
conf.File = flagset.Args()[0]
} else {
if !conf.Showversion {
flagset.Usage()
os.Exit(1)
}
}
for _, label := range conf.Label {
if len(label) == 0 {
continue
}
parts := strings.Split(label, "=")
if len(parts) != 2 {
return nil, errors.New("invalid label spec: " + label + ", expected label=value")
}
conf.Labels = append(conf.Labels, Label{Name: parts[0], Value: parts[1]})
}
return conf, nil
}
func die(err error, fd *os.File) bool {
slog.Debug("failed to check io", "error", err)
if fd != nil {
if err := fd.Close(); err != nil {
slog.Debug("failed to close filehandle", "error", err)
}
}
return false
}
func setLogger(output io.Writer) {
logLevel := &slog.LevelVar{}
opts := &tint.Options{
Level: logLevel,
AddSource: false,
}
logLevel.Set(slog.LevelDebug)
handler := tint.NewHandler(output, opts)
logger := slog.New(handler)
slog.SetDefault(logger)
}
func main() {
conf, err := InitConfig(os.Stdout)
if err != nil {
log.Fatal(err)
}
promRegistry := prometheus.NewRegistry()
for _, label := range conf.Labels {
labels = append(labels, label.Name)
}
ioexporterRun := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "io_exporter_io_operation",
Help: "whether io is working on the pvc, 1=ok, 0=fail",
},
labels,
)
ioexporterLatency := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "io_exporter_io_latency",
Help: "how long does the operation take in seconds",
},
labels,
)
promRegistry.MustRegister(ioexporterRun, ioexporterLatency)
timeoutstr := fmt.Sprintf("%d", conf.Timeout)
setLogger(os.Stdout)
go func() {
for {
var res float64
start := time.Now()
if check(conf.File, time.Duration(conf.Timeout)*time.Second) {
res = 1
} else {
res = 0
}
// ns => s
now := time.Now()
elapsed := float64(now.Sub(start).Nanoseconds()) / 10000000000
values := []string{conf.File, timeoutstr}
for _, label := range conf.Labels {
values = append(values, label.Value)
}
ioexporterRun.WithLabelValues(values...).Set(res)
ioexporterLatency.WithLabelValues(values...).Set(elapsed)
time.Sleep(SLEEP * time.Second)
}
}()
http.Handle("/metrics", promhttp.HandlerFor(
promRegistry,
promhttp.HandlerOpts{},
))
slog.Info("start testing and serving metrics on localhost", "port", conf.Port)
slog.Info("test setup", "file", conf.File, "labels", strings.Join(conf.Label, ","))
http.ListenAndServe(fmt.Sprintf(":%d", conf.Port), nil)
}
// Calls runcheck() with timeout
func check(file string, timeout time.Duration) bool {
ctx := context.Background()
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
run := make(chan struct{}, 1)
var res bool
go func() {
res = runcheck(file)
run <- struct{}{}
}()
for {
select {
case <-ctx.Done():
return die(ctx.Err(), nil)
case <-run:
return res
}
}
}
// Checks file io on the specified path:
//
// - open the file (create if it doesnt exist)
// - truncate it if it already exists
// - write some data to it
// - closes the file
// - re-opens it for reading
// - reads the block
// - compares if written block is equal to read block
// - closes file again
//
// Returns false if anything failed during that sequence,
// true otherwise.
func runcheck(file string) bool {
// write
fd, err := directio.OpenFile(file, os.O_RDWR|os.O_TRUNC|os.O_CREATE, 0640)
if err != nil {
die(err, nil)
}
block1 := directio.AlignedBlock(directio.BlockSize)
for i := 0; i < len(block1); i++ {
block1[i] = 'A'
}
n, err := fd.Write(block1)
if err != nil {
return die(err, fd)
}
if n != len(block1) {
return die(errors.New("failed to write block"), fd)
}
if err := fd.Close(); err != nil {
return die(err, nil)
}
// read
in, err := directio.OpenFile(file, os.O_RDONLY, 0640)
if err != nil {
die(err, nil)
}
block2 := directio.AlignedBlock(directio.BlockSize)
n, err = io.ReadFull(in, block2)
if err != nil {
return die(err, in)
}
if n != len(block1) {
return die(errors.New("failed to read block"), fd)
}
if err := in.Close(); err != nil {
return die(err, nil)
}
// compare
if !bytes.Equal(block1, block2) {
return die(errors.New("Read not the same as written"), nil)
}
return true
}