format in "/var/log/messages style"

cmd/circologd/http.go

@@ -22,12 +22,7 @@ func getHTTPHandler(hub circolog.Hub) http.HandlerFunc {
 		hub.Register <- client
 
 		for x := range client.Messages {
-			logmsg := x
-			if logmsg["message"] == nil {
-				continue
-			}
-			c := logmsg["message"].(string)
-			w.Write([]byte(c))
+			w.Write([]byte(circolog.FormatSyslog(x)))
 			w.Write([]byte("\n"))
 		}
 	}
@@ -67,9 +62,7 @@ func getWSHandler(hub circolog.Hub) http.HandlerFunc {
 					if err != nil {
 						return
 					}
-					if msg, ok := message["message"]; ok {
-						w.Write([]byte(msg.(string)))
-					}
+					w.Write([]byte(circolog.FormatSyslog(message)))
 
 					if err := w.Close(); err != nil {
 						return

format.go

@@ -0,0 +1,41 @@
+package circolog
+
+import (
+	"bytes"
+	"fmt"
+	"text/template"
+	"time"
+
+	"gopkg.in/mcuadros/go-syslog.v2/format"
+)
+
+// Formatter is an interface, so that multiple implementations can exist
+type Formatter func(format.LogParts) string
+
+var tmplFuncs template.FuncMap
+var syslogTmpl *template.Template
+
+func init() {
+	tmplFuncs := template.FuncMap{
+		"dateFormat": func(dt time.Time, fmt string) string {
+			return dt.Format(fmt)
+		},
+		"rfc822": func(dt time.Time) string {
+			return dt.Format(time.RFC822)
+		},
+	}
+	syslogTmpl = template.Must(template.New("syslog").Funcs(tmplFuncs).Parse(
+		"{{rfc822 (index . \"timestamp\")}} {{index . \"hostname\"}} " +
+			"{{index . \"app_name\"}}" +
+			"{{ if (ne (index . \"proc_id\") \"-\")}}[{{index . \"proc_id\"}}]{{end}}: " +
+			"{{index . \"message\"}}",
+	))
+}
+
+// FormatSyslog format a message in the typical format used in /var/log/messages
+func FormatSyslog(msg format.LogParts) string {
+	fmt.Printf("%#v\n", msg["timestamp"])
+	var buf bytes.Buffer
+	syslogTmpl.Execute(&buf, msg)
+	return buf.String()
+}