feat: collect and display usage stats

This commit is contained in:
wpetit 2023-09-24 12:21:44 -06:00
parent bf14a70efe
commit 6b1637d1d8
17 changed files with 394 additions and 25 deletions

1
.gitignore vendored
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@ -9,3 +9,4 @@
tools/
/CHANGELOG.md
/.chglog
/stats.json

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@ -9,7 +9,7 @@ builds:
ldflags:
- -s
- -w
- -X 'main.Version=${MKT_PROJECT_VERSION}'
- -X "main.Version={{ .Env.GORELEASER_CURRENT_TAG }}"
gcflags:
- -trimpath="${PWD}"
asmflags:

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@ -11,6 +11,8 @@ import (
"github.com/pkg/errors"
)
var Version string = "unknown"
func main() {
opts := rebound.DefaultOptions()
@ -18,8 +20,12 @@ func main() {
log.Fatalf("[ERROR] %+v", errors.WithStack(err))
}
opts.HTTP.TemplateData.Version = Version
server := rebound.NewServer(
rebound.WithAddress(opts.Address),
rebound.WithStatsFile(opts.StatsFile),
rebound.WithStatsFileSaveInterval(opts.StatsFileSaveInterval),
rebound.WithSSHOption(
ssh.WithSockDir(opts.SSH.SockDir),
ssh.WithPublicHost(opts.SSH.PublicHost),

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@ -2,16 +2,20 @@ package http
import (
"log"
"forge.cadoles.com/wpetit/rebound/stat"
)
type Options struct {
Logger func(message string, args ...any)
CustomDir string `env:"CUSTOM_DIR"`
TemplateData *TemplateData `envPrefix:"TEMPLATE_DATA_"`
Stats *stat.Store
}
type TemplateData struct {
Title string `env:"TITLE"`
Version string
SSHPublicHost string `env:"SSH_PUBLIC_HOST"`
SSHPublicPort int `env:"SSH_PUBLIC_PORT"`
}
@ -27,6 +31,7 @@ func DefaultOptions() *Options {
SSHPublicHost: "127.0.0.1",
SSHPublicPort: 2222,
},
Stats: stat.NewStore(),
}
}
@ -47,3 +52,9 @@ func WithTemplateData(templateData *TemplateData) func(*Options) {
opts.TemplateData = templateData
}
}
func WithStats(stats *stat.Store) func(*Options) {
return func(opts *Options) {
opts.Stats = stats
}
}

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@ -3,9 +3,11 @@ package http
import (
"bytes"
"embed"
"fmt"
"html/template"
"io"
"io/fs"
"log/slog"
"net"
"net/http"
"os"
@ -29,8 +31,45 @@ type Server struct {
templates template.Template
}
var templateFuncs = template.FuncMap{
"humanSize": func(b float64) string {
const unit = 1000
if b < unit {
return fmt.Sprintf("%d B", int64(b))
}
div, exp := int64(unit), 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %cB",
float64(b)/float64(div), "kMGTPE"[exp])
},
}
func (s *Server) serveHomepage(w http.ResponseWriter, r *http.Request) {
s.renderTemplate(w, "index", s.opts.TemplateData)
stats, err := s.opts.Stats.Snapshot()
if err != nil {
slog.Error("could not make stats snapshot", slog.Any("error", errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
data := struct {
TemplateData
Stats map[string]float64
}{
TemplateData: *s.opts.TemplateData,
Stats: stats,
}
s.opts.Stats.Add(StatTotalPageView, 1, 0)
s.renderTemplate(w, "index", data)
}
func (s *Server) Serve(l net.Listener) error {
@ -67,7 +106,7 @@ func (s *Server) Serve(l net.Listener) error {
}
func (s *Server) parseTemplates(fs fs.FS) error {
templates, err := template.ParseFS(fs, "templates/*.html")
templates, err := template.New("").Funcs(templateFuncs).ParseFS(fs, "templates/*.html")
if err != nil {
return errors.WithStack(err)
}

5
http/stats.go Normal file
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@ -0,0 +1,5 @@
package http
const (
StatTotalPageView = "total_page_view"
)

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@ -2,7 +2,7 @@
<footer class="footer">
<div class="container">
<div class="content has-text-centered">
Ce service est propulsé par <a href="https://forge.cadoles.com/wpetit/rebound" title="Rebound repository">Rebound</a>, un logiciel libre diffusé sous licence <a href="https://www.gnu.org/licenses/agpl-3.0.en.html#license-text">AGPL-3.0</a>.
Ce service est propulsé par <a href="https://forge.cadoles.com/wpetit/rebound" title="Rebound repository">rebound@{{ .Version }}</a>, un logiciel libre diffusé sous licence <a href="https://www.gnu.org/licenses/agpl-3.0.en.html#license-text">AGPL-3.0</a>.
</div>
</div>
</footer>

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@ -13,14 +13,46 @@
<p class="subtitle is-size-3">
Bienvenue sur <strong>Rebound</strong>!
</p>
<div class="content">
<p>Rebound est un serveur SSH permettant de créer des tunnels TCP/IP éphémères et privés entre 2 machines positionnées
derrière un <abbr title="Network Address Traversal">NAT</abbr>.</p>
<p>Pour l'utiliser <strong>un simple client SSH suffit !</strong></p>
<pre class="has-background-dark has-text-white-ter is-family-monospace">ssh -R 0:127.0.0.1:<span class="has-text-info">&lt;port&gt;</span> rebound@{{ .SSHPublicHost }} -p {{ .SSHPublicPort }}</pre>
<p class="is-italic"><span class="has-text-info">&lt;port&gt;</span> est à remplacer par le port du service
s'exécutant sur votre machine en local.</span>
<p>Une fois connecté, suivez les instructions. 😉</p>
<div class="block">
<div class="content">
<p>Rebound est un serveur SSH permettant de créer des tunnels TCP/IP éphémères et privés entre 2 machines positionnées
derrière un <abbr title="Network Address Traversal">NAT</abbr>.</p>
<p>Pour l'utiliser <strong>un simple client SSH suffit !</strong></p>
<pre class="has-background-dark has-text-white-ter is-family-monospace">ssh -R 0:127.0.0.1:<span class="has-text-info">&lt;port&gt;</span> rebound@{{ .SSHPublicHost }} -p {{ .SSHPublicPort }}</pre>
<p class="is-italic"><span class="has-text-info">&lt;port&gt;</span> est à remplacer par le port du service
s'exécutant sur votre machine en local.</span>
<p>Une fois connecté, suivez les instructions. 😉</p>
</div>
</div>
<hr />
<div class="block">
<div class="columns">
<div class="column is-4">
<h3 class="title is-size-4">En savoir plus</h3>
<div class="content">
À venir...
</div>
</div>
<div class="column is-4">
<h3 class="title is-size-4">Statistiques</h3>
<table class="table is-bordered is-striped is-fullwidth">
<tbody>
<tr>
<td><strong>Total tunnels ouverts</strong></td>
<td>{{ index .Stats "total_opened_tunnels" }}</td>
</tr>
<tr>
<td><strong>Total données entrantes</strong></td>
<td>{{ humanSize ( index .Stats "total_rx_bytes" ) }}</td>
</tr>
<tr>
<td><strong>Total données sortantes</strong></td>
<td>{{ humanSize ( index .Stats "total_tx_bytes" ) }}</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</section>

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@ -4,6 +4,7 @@ export REBOUND_SSH_PUBLIC_HOST=rebound
export REBOUND_SSH_PUBLIC_PORT=2222
export REBOUND_SSH_SOCK_DIR=/var/lib/rebound/socks
export REBOUND_SSH_HOST_KEY=/etc/rebound/host.key
export REBOUND_STATS_FILE=/var/lib/rebound/stats.json
export REBOUND_HTTP_TEMPLATE_DATA_TITLE=Rebound
export REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_HOST=127.0.0.1
export REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_PORT=8080

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@ -4,6 +4,7 @@ REBOUND_SSH_PUBLIC_HOST=rebound
REBOUND_SSH_PUBLIC_PORT=8080
REBOUND_SSH_SOCK_DIR=/var/lib/rebound/socks
REBOUND_SSH_HOST_KEY=/var/lib/rebound/host.key
REBOUND_STATS_FILE=/var/lib/rebound/stats.json
REBOUND_HTTP_TEMPLATE_DATA_TITLE=Rebound
REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_HOST=127.0.0.1
REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_PORT=8080

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@ -2,6 +2,7 @@ package rebound
import (
"log"
"time"
"forge.cadoles.com/wpetit/rebound/http"
"forge.cadoles.com/wpetit/rebound/ssh"
@ -10,10 +11,12 @@ import (
)
type Options struct {
Address string `env:"REBOUND_ADDRESS"`
Logger func(message string, args ...any)
SSH *ssh.Options `envPrefix:"REBOUND_SSH_"`
HTTP *http.Options `envPrefix:"REBOUND_HTTP_"`
Address string `env:"REBOUND_ADDRESS"`
StatsFile string `env:"REBOUND_STATS_FILE"`
StatsFileSaveInterval time.Duration `env:"REBOUND_STATS_FILE_SAVE_INTERVAL"`
Logger func(message string, args ...any)
SSH *ssh.Options `envPrefix:"REBOUND_SSH_"`
HTTP *http.Options `envPrefix:"REBOUND_HTTP_"`
}
func (o *Options) ParseEnv() error {
@ -28,10 +31,12 @@ type OptionFunc func(*Options)
func DefaultOptions() *Options {
return &Options{
Address: "127.0.0.1:2222",
Logger: log.Printf,
SSH: ssh.DefaultOptions(),
HTTP: http.DefaultOptions(),
Address: "127.0.0.1:2222",
StatsFile: "stats.json",
StatsFileSaveInterval: 30 * time.Second,
Logger: log.Printf,
SSH: ssh.DefaultOptions(),
HTTP: http.DefaultOptions(),
}
}
@ -49,6 +54,18 @@ func WithLogger(logger func(message string, args ...any)) func(*Options) {
}
}
func WithStatsFile(path string) func(*Options) {
return func(o *Options) {
o.StatsFile = path
}
}
func WithStatsFileSaveInterval(interval time.Duration) func(*Options) {
return func(o *Options) {
o.StatsFileSaveInterval = interval
}
}
func WithSSHOption(funcs ...ssh.OptionFunc) func(*Options) {
return func(o *Options) {
for _, fn := range funcs {

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@ -1,21 +1,34 @@
package rebound
import (
"log/slog"
"net"
"os"
"time"
"forge.cadoles.com/wpetit/rebound/http"
"forge.cadoles.com/wpetit/rebound/ssh"
"forge.cadoles.com/wpetit/rebound/stat"
"github.com/pkg/errors"
)
type Server struct {
listener net.Listener
opts *Options
stats *stat.Store
}
func (s *Server) Start() error {
s.log("[INFO] listening on %s", s.opts.Address)
if err := s.stats.Load(s.opts.StatsFile); err != nil {
if errors.Is(err, os.ErrNotExist) {
s.log("[INFO] stats file does not exist. ignoring.")
} else {
return errors.WithStack(err)
}
}
listener, err := net.Listen("tcp", s.opts.Address)
if err != nil {
return errors.WithStack(err)
@ -34,6 +47,7 @@ func (s *Server) Start() error {
ssh.WithPublicPort(s.opts.SSH.PublicPort),
ssh.WithSockDir(s.opts.SSH.SockDir),
ssh.WithLogger(s.opts.SSH.Logger),
ssh.WithStats(s.stats),
)
if err := server.Serve(sshListener); err != nil {
@ -49,6 +63,7 @@ func (s *Server) Start() error {
http.WithCustomDir(s.opts.HTTP.CustomDir),
http.WithTemplateData(s.opts.HTTP.TemplateData),
http.WithLogger(s.opts.HTTP.Logger),
http.WithStats(s.stats),
)
if err := server.Serve(httpListener); err != nil {
@ -57,6 +72,23 @@ func (s *Server) Start() error {
}
}()
go func() {
defer listener.Close()
ticker := time.NewTicker(s.opts.StatsFileSaveInterval)
for {
<-ticker.C
slog.Info("saving stats", slog.String("file", s.opts.StatsFile), slog.Duration("interval", s.opts.StatsFileSaveInterval))
if err := s.stats.Save(s.opts.StatsFile); err != nil {
slog.Error("could not save stat file", slog.Any("error", errors.WithStack(err)))
return
}
}
}()
return nil
}
@ -85,6 +117,7 @@ func NewServer(funcs ...OptionFunc) *Server {
}
return &Server{
opts: opts,
opts: opts,
stats: stat.NewStore(),
}
}

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@ -77,7 +77,13 @@ func (s *Server) handleDirectTCP(srv *ssh.Server, conn *gossh.ServerConn, newCha
defer dconn.Close()
defer ch.Close()
if _, err := io.Copy(ch, dconn); err != nil {
reader := &instrumentedReader{
internal: dconn,
stats: s.opts.Stats,
name: StatTotalRxBytes,
}
if _, err := io.Copy(ch, reader); err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
@ -90,7 +96,13 @@ func (s *Server) handleDirectTCP(srv *ssh.Server, conn *gossh.ServerConn, newCha
defer dconn.Close()
defer ch.Close()
if _, err := io.Copy(dconn, ch); err != nil {
writer := &instrumentedWriter{
internal: dconn,
stats: s.opts.Stats,
name: StatTotalTxBytes,
}
if _, err := io.Copy(writer, ch); err != nil {
s.log("[ERROR] %+v", errors.WithStack(err))
}
}()

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@ -1,6 +1,10 @@
package ssh
import "log"
import (
"log"
"forge.cadoles.com/wpetit/rebound/stat"
)
type Options struct {
Logger func(message string, args ...any)
@ -8,6 +12,7 @@ type Options struct {
PublicPort uint `env:"PUBLIC_PORT"`
PublicHost string `env:"PUBLIC_HOST"`
HostKey string `env:"HOST_KEY"`
Stats *stat.Store
}
type OptionFunc func(*Options)
@ -19,6 +24,7 @@ func DefaultOptions() *Options {
PublicPort: 2222,
PublicHost: "127.0.0.1",
HostKey: "./host.key",
Stats: stat.NewStore(),
}
}
@ -51,3 +57,9 @@ func WithLogger(logger func(message string, args ...any)) func(*Options) {
opts.Logger = logger
}
}
func WithStats(stats *stat.Store) func(*Options) {
return func(opts *Options) {
opts.Stats = stats
}
}

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@ -91,6 +91,8 @@ func (s *Server) handleRequest(ctx ssh.Context, srv *ssh.Server, req *gossh.Requ
return false, []byte{}
}
s.opts.Stats.Add(StatTotalOpenedTunnels, 1, 0)
destPort := 1
s.requestHandlerLock.Lock()

43
ssh/stats.go Normal file
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@ -0,0 +1,43 @@
package ssh
import (
"io"
"forge.cadoles.com/wpetit/rebound/stat"
)
const (
StatTotalOpenedTunnels = "total_opened_tunnels"
StatTotalTxBytes = "total_tx_bytes"
StatTotalRxBytes = "total_rx_bytes"
)
type instrumentedWriter struct {
name string
stats *stat.Store
internal io.Writer
}
// Write implements io.Writer.
func (w *instrumentedWriter) Write(p []byte) (n int, err error) {
n, err = w.internal.Write(p)
w.stats.Add(w.name, float64(n), 0)
return n, err
}
var _ io.Writer = &instrumentedWriter{}
type instrumentedReader struct {
name string
stats *stat.Store
internal io.Reader
}
// Read implements io.Reader.
func (w *instrumentedReader) Read(p []byte) (n int, err error) {
n, err = w.internal.Read(p)
w.stats.Add(w.name, float64(n), 0)
return n, err
}
var _ io.Reader = &instrumentedReader{}

154
stat/store.go Normal file
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@ -0,0 +1,154 @@
package stat
import (
"encoding/json"
"os"
"path/filepath"
"sync"
"log/slog"
"github.com/pkg/errors"
)
type Store struct {
data sync.Map
loadSaveLock sync.Mutex
}
func (s *Store) Load(path string) error {
s.loadSaveLock.Lock()
defer s.loadSaveLock.Unlock()
file, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
if err != nil {
return errors.WithStack(err)
}
decoder := json.NewDecoder(file)
data := map[string]any{}
if err := decoder.Decode(&data); err != nil {
return errors.WithStack(err)
}
s.data.Range(func(key, value any) bool {
s.data.Delete(key)
return true
})
for k, v := range data {
s.data.Store(k, v)
}
return nil
}
func (s *Store) Save(path string) error {
s.loadSaveLock.Lock()
defer s.loadSaveLock.Unlock()
data, err := s.Snapshot()
if err != nil {
return errors.WithStack(err)
}
dir := filepath.Dir(path)
filename := filepath.Base(path)
temp, err := os.CreateTemp(dir, filename+".new*")
if err != nil {
return errors.WithStack(err)
}
defer func() {
if err := os.Remove(temp.Name()); err != nil && !errors.Is(err, os.ErrNotExist) {
slog.Error("could not remove temporary file",
slog.String("file", temp.Name()),
slog.Any("error", errors.WithStack(err)),
)
}
}()
encoder := json.NewEncoder(temp)
if err := encoder.Encode(data); err != nil {
return errors.WithStack(err)
}
if err := os.Rename(temp.Name(), path); err != nil {
return errors.WithStack(err)
}
return nil
}
func (s *Store) Snapshot() (map[string]float64, error) {
data := map[string]float64{}
var err error
s.data.Range(func(rawKey, rawValue any) bool {
key, ok := rawKey.(string)
if !ok {
err = errors.Errorf("unexpected stat key of '%v'", rawKey)
return false
}
value, ok := rawValue.(float64)
if !ok {
err = errors.Errorf("unexpected stat value of '%v'", rawValue)
return false
}
data[key] = value
return true
})
if err != nil {
return nil, errors.WithStack(err)
}
return data, nil
}
func (s *Store) Add(name string, added float64, defaultValue float64) float64 {
for {
value := s.Get(name, defaultValue)
if value == defaultValue {
s.data.Store(name, defaultValue)
}
sum := value + added
if s.data.CompareAndSwap(name, value, value+added) {
return sum
}
}
}
func (s *Store) Set(name string, value float64) float64 {
s.data.Store(name, value)
return value
}
func (s *Store) Get(name string, defaultValue float64) float64 {
rawValue, ok := s.data.Load(name)
if !ok {
return defaultValue
}
value, ok := rawValue.(float64)
if !ok {
return defaultValue
}
return value
}
func NewStore() *Store {
return &Store{
data: sync.Map{},
loadSaveLock: sync.Mutex{},
}
}