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certpoolwatcher.go
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certpoolwatcher.go
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package httputil
import (
"crypto/x509"
"fmt"
"os"
"sync"
"time"
"github.com/fsnotify/fsnotify"
"github.com/go-logr/logr"
)
type CertPoolWatcher struct {
generation int
dir string
mx sync.RWMutex
pool *x509.CertPool
log logr.Logger
watcher *fsnotify.Watcher
done chan bool
}
// Returns the current CertPool and the generation number
func (cpw *CertPoolWatcher) Get() (*x509.CertPool, int, error) {
cpw.mx.RLock()
defer cpw.mx.RUnlock()
if cpw.pool == nil {
return nil, 0, fmt.Errorf("no certificate pool available")
}
return cpw.pool.Clone(), cpw.generation, nil
}
func (cpw *CertPoolWatcher) Done() {
cpw.done <- true
}
func NewCertPoolWatcher(caDir string, log logr.Logger) (*CertPoolWatcher, error) {
pool, err := NewCertPool(caDir, log)
if err != nil {
return nil, err
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
if err = watcher.Add(caDir); err != nil {
return nil, err
}
cpw := &CertPoolWatcher{
generation: 1,
dir: caDir,
pool: pool,
log: log,
watcher: watcher,
done: make(chan bool),
}
go func() {
for {
select {
case <-watcher.Events:
cpw.drainEvents()
cpw.update()
case err := <-watcher.Errors:
log.Error(err, "error watching certificate dir")
os.Exit(1)
case <-cpw.done:
err := watcher.Close()
if err != nil {
log.Error(err, "error closing watcher")
}
return
}
}
}()
return cpw, nil
}
func (cpw *CertPoolWatcher) update() {
cpw.log.Info("updating certificate pool")
pool, err := NewCertPool(cpw.dir, cpw.log)
if err != nil {
cpw.log.Error(err, "error updating certificate pool")
os.Exit(1)
}
cpw.mx.Lock()
defer cpw.mx.Unlock()
cpw.pool = pool
cpw.generation++
}
// Drain as many events as possible before doing anything
// Otherwise, we will be hit with an event for _every_ entry in the
// directory, and end up doing an update for each one
func (cpw *CertPoolWatcher) drainEvents() {
for {
drainTimer := time.NewTimer(time.Millisecond * 50)
select {
case <-drainTimer.C:
return
case <-cpw.watcher.Events:
}
if !drainTimer.Stop() {
<-drainTimer.C
}
}
}