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// Copyright (C) MongoDB, Inc. 2017-present.
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
package session
import (
var rander = rand.Reader
// Server is an open session with the server.
type Server struct {
SessionID bsonx.Doc
TxnNumber int64
LastUsed time.Time
Dirty bool
// returns whether or not a session has expired given a timeout in minutes
// a session is considered expired if it has less than 1 minute left before becoming stale
func (ss *Server) expired(timeoutMinutes uint32) bool {
if timeoutMinutes <= 0 {
return true
timeUnused := time.Since(ss.LastUsed).Minutes()
return timeUnused > float64(timeoutMinutes-1)
// update the last used time for this session.
// must be called whenever this server session is used to send a command to the server.
func (ss *Server) updateUseTime() {
ss.LastUsed = time.Now()
func newServerSession() (*Server, error) {
id, err := uuid.New()
if err != nil {
return nil, err
idDoc := bsonx.Doc{{"id", bsonx.Binary(UUIDSubtype, id[:])}}
return &Server{
SessionID: idDoc,
LastUsed: time.Now(),
}, nil
// IncrementTxnNumber increments the transaction number.
func (ss *Server) IncrementTxnNumber() {
// MarkDirty marks the session as dirty.
func (ss *Server) MarkDirty() {
ss.Dirty = true
// UUIDSubtype is the BSON binary subtype that a UUID should be encoded as
const UUIDSubtype byte = 4
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