| // 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 http://www.apache.org/licenses/LICENSE-2.0 |
| |
| package session |
| |
| import ( |
| "time" |
| |
| "crypto/rand" |
| |
| "github.com/mongodb/mongo-go-driver/x/bsonx" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/uuid" |
| ) |
| |
| var rander = rand.Reader |
| |
| // Server is an open session with the server. |
| type Server struct { |
| SessionID bsonx.Doc |
| TxnNumber int64 |
| LastUsed time.Time |
| } |
| |
| // 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() { |
| ss.TxnNumber++ |
| } |
| |
| // UUIDSubtype is the BSON binary subtype that a UUID should be encoded as |
| const UUIDSubtype byte = 4 |