Add prometheus metric exporting.

Wrap existing mailstore with prometheus monitoring one.
Add flags for IMAP & HTTP listen addresses.

cmd/ximap/ximap.go

@@ -1,21 +1,41 @@
 package main
 
 import (
+	"flag"
 	"fmt"
+	"net/http"
 	"os"
 
+	xprometheus "xinu.tv/imapstore/prometheus"
+
+	"github.com/golang/glog"
 	"github.com/jordwest/imap-server"
 	"github.com/jordwest/imap-server/mailstore"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	imapAddr = flag.String("imap", ":10143", "listen address for IMAP")
+	httpAddr = flag.String("http", ":10080", "listen address for HTTP")
 )
 
 func main() {
-	store := mailstore.NewDummyMailstore()
+	flag.Parse()
+	defer glog.Flush()
+
+	http.Handle("/metrics", prometheus.Handler())
+	go func() {
+		glog.Fatal(http.ListenAndServe(*httpAddr, nil))
+	}()
+
+	var store mailstore.Mailstore
+	store = mailstore.NewDummyMailstore()
+	store = xprometheus.NewMailstore(store)
 	s := imap.NewServer(store)
 	s.Transcript = os.Stdout
-	s.Addr = ":10143"
+	s.Addr = *imapAddr
 
-	err := s.ListenAndServe()
-	if err != nil {
+	if err := s.ListenAndServe(); err != nil {
 		fmt.Printf("Error creating test connection: %s\n", err)
 	}
 }