Initial pgterminate code

notifier/file.go

@@ -0,0 +1,55 @@
+package notifier
+
+import (
+	"github.com/jouir/pgterminate/base"
+	"log"
+	"os"
+	"time"
+)
+
+// File structure for file notifier
+type File struct {
+	handle   *os.File
+	name     string
+	sessions chan base.Session
+}
+
+// NewFile creates a file notifier
+func NewFile(name string, sessions chan base.Session) Notifier {
+	return &File{
+		name:     name,
+		sessions: sessions,
+	}
+}
+
+// Run starts the file notifier
+func (f *File) Run() {
+	f.open()
+	defer f.terminate()
+
+	for session := range f.sessions {
+		timestamp := time.Now().Format(time.RFC3339)
+		_, err := f.handle.WriteString(timestamp + " " + session.String() + "\n")
+		base.Panic(err)
+	}
+}
+
+// open opens a log file
+func (f *File) open() {
+	var err error
+	f.handle, err = os.OpenFile(f.name, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	base.Panic(err)
+}
+
+// Reload closes and re-open the file to be compatible with logrotate
+func (f *File) Reload() {
+	log.Println("Re-opening log file", f.name)
+	f.handle.Close()
+	f.open()
+}
+
+// terminate closes the file
+func (f *File) terminate() {
+	log.Println("Closing log file", f.name)
+	f.handle.Close()
+}