read configuration file

vendor/github.com/pyke369/golang-support/dynacert/dynacert.go

@@ -0,0 +1,54 @@
+package dynacert
+
+import (
+	"crypto/tls"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+)
+
+type DYNACERT struct {
+	Public, Key    string
+	Certificate    *tls.Certificate
+	Last, Modified time.Time
+	sync.RWMutex
+}
+
+var cores int
+
+func (this *DYNACERT) GetCertificate(*tls.ClientHelloInfo) (cert *tls.Certificate, err error) {
+	var info os.FileInfo
+
+	if cores == 0 {
+		cores = runtime.NumCPU()
+	}
+	if this.Certificate == nil || time.Now().Sub(this.Last) >= 10*time.Second {
+		this.Last = time.Now()
+		if info, err = os.Stat(this.Public); err != nil {
+			return nil, err
+		}
+		if _, err = os.Stat(this.Key); err != nil {
+			return nil, err
+		}
+		if this.Certificate == nil || info.ModTime().Sub(this.Modified) != 0 {
+			if certificate, err := tls.LoadX509KeyPair(this.Public, this.Key); err != nil {
+				return nil, err
+			} else {
+				if cores > 1 {
+					this.Lock()
+				}
+				this.Modified = info.ModTime()
+				this.Certificate = &certificate
+				if cores > 1 {
+					this.Unlock()
+				}
+			}
+		}
+	}
+	if cores > 1 {
+		this.RLock()
+		defer this.RUnlock()
+	}
+	return this.Certificate, nil
+}