added loggables pkg

util/eventlog/loggables/loggables.go

+// Package loggables includes a bunch of transaltor functions for commonplace/stdlib
+// objects. This is boilerplate code that shouldn't change much, and not sprinkled
+// all over the place (i.e. gather it here).
+//
+// Note: it may make sense to put all stdlib Loggable functions in the eventlog
+// package. Putting it here for now in case we don't want to polute it.
+package loggables
+
+import (
+	"net"
+
+	log "github.com/jbenet/go-ipfs/util/eventlog"
+)
+
+// NetConn returns an eventlog.Metadata with the conn addresses
+func NetConn(c net.Conn) log.Loggable {
+	return log.Metadata{
+		"localAddr":  c.LocalAddr(),
+		"remoteAddr": c.RemoteAddr(),
+	}
+}
+
+// Error returns an eventlog.Metadata with an error
+func Error(e error) log.Loggable {
+	return log.Metadata{
+		"error": e.Error(),
+	}
+}