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// Copyright (C) MongoDB, Inc. 2014-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 mongodump
import (
"context"
"fmt"
"github.com/mongodb/mongo-tools-common/db"
"github.com/mongodb/mongo-tools-common/log"
"github.com/mongodb/mongo-tools-common/util"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo"
mopt "go.mongodb.org/mongo-driver/mongo/options"
"go.mongodb.org/mongo-driver/mongo/readconcern"
)
// determineOplogCollectionName uses a command to infer
// the name of the oplog collection in the connected db
func (dump *MongoDump) determineOplogCollectionName() error {
masterDoc := bson.M{}
err := dump.SessionProvider.RunString("isMaster", &masterDoc, "admin")
if err != nil {
return fmt.Errorf("error running command: %v", err)
}
if _, ok := masterDoc["hosts"]; ok {
log.Logvf(log.DebugLow, "determined cluster to be a replica set")
log.Logvf(log.DebugHigh, "oplog located in local.oplog.rs")
dump.oplogCollection = "oplog.rs"
return nil
}
if isMaster := masterDoc["ismaster"]; util.IsFalsy(isMaster) {
log.Logvf(log.Info, "mongodump is not connected to a master")
return fmt.Errorf("not connected to master")
}
log.Logvf(log.DebugLow, "not connected to a replica set, assuming master/slave")
log.Logvf(log.DebugHigh, "oplog located in local.oplog.$main")
dump.oplogCollection = "oplog.$main"
return nil
}
// getOplogCurrentTime returns the most recent oplog entry
func (dump *MongoDump) getCurrentOplogTime() (primitive.Timestamp, error) {
mostRecentOplogEntry := db.Oplog{}
var tempBSON bson.Raw
err := dump.SessionProvider.FindOne("local", dump.oplogCollection, 0, nil, &bson.M{"$natural": -1}, &tempBSON, 0)
if err != nil {
return primitive.Timestamp{}, fmt.Errorf("error getting recent oplog entry: %v", err)
}
err = bson.Unmarshal(tempBSON, &mostRecentOplogEntry)
if err != nil {
return primitive.Timestamp{}, err
}
return mostRecentOplogEntry.Timestamp, nil
}
// getOplogCopyStartTime returns either the oldest active transaction timestamp or the
// current oplog time if there are no active transactions.
func (dump *MongoDump) getOplogCopyStartTime() (primitive.Timestamp, error) {
client, err := dump.SessionProvider.GetSession()
if err != nil {
return primitive.Timestamp{}, fmt.Errorf("error getting client: %v", err)
}
coll := client.Database("config").Collection("transactions", mopt.Collection().SetReadConcern(readconcern.Local()))
filter := bson.D{{"state", bson.D{{"$in", bson.A{"prepared", "inProgress"}}}}}
opts := mopt.FindOne().SetSort(bson.D{{"startOpTime", 1}})
var result bson.Raw
res := coll.FindOne(context.Background(), filter, opts)
err = res.Decode(&result)
if err != nil {
if err == mongo.ErrNoDocuments {
return dump.getCurrentOplogTime()
}
return primitive.Timestamp{}, fmt.Errorf("config.transactions.findOne error: %v", err)
}
rawTS, err := result.LookupErr("startOpTime", "ts")
if err != nil {
return primitive.Timestamp{}, fmt.Errorf("config.transactions row had no startOpTime.ts field")
}
t, i, ok := rawTS.TimestampOK()
if !ok {
return primitive.Timestamp{}, fmt.Errorf("config.transactions startOpTime.ts was not a BSON timestamp")
}
return primitive.Timestamp{T: t, I: i}, nil
}
// checkOplogTimestampExists checks to make sure the oplog hasn't rolled over
// since mongodump started. It does this by checking the oldest oplog entry
// still in the database and making sure it happened at or before the timestamp
// captured at the start of the dump.
func (dump *MongoDump) checkOplogTimestampExists(ts primitive.Timestamp) (bool, error) {
oldestOplogEntry := db.Oplog{}
var tempBSON bson.Raw
err := dump.SessionProvider.FindOne("local", dump.oplogCollection, 0, nil, &bson.M{"$natural": 1}, &tempBSON, 0)
if err != nil {
return false, fmt.Errorf("unable to read entry from oplog: %v", err)
}
err = bson.Unmarshal(tempBSON, &oldestOplogEntry)
if err != nil {
return false, err
}
log.Logvf(log.DebugHigh, "oldest oplog entry has timestamp %v", oldestOplogEntry.Timestamp)
if util.TimestampGreaterThan(oldestOplogEntry.Timestamp, ts) {
log.Logvf(log.Info, "oldest oplog entry of timestamp %v is older than %v",
oldestOplogEntry.Timestamp, ts)
return false, nil
}
return true, nil
}
func oplogDocumentValidator(in []byte) error {
raw := bson.Raw(in)
if nsVal, err := raw.LookupErr("ns"); err == nil {
if nsStr, ok := nsVal.StringValueOK(); ok && nsStr == "admin.system.version" {
return fmt.Errorf("cannot dump with oplog if admin.system.version is modified")
}
}
if _, err := raw.LookupErr("o", "renameCollection"); err == nil {
return fmt.Errorf("cannot dump with oplog while renames occur")
}
return nil
}
// DumpOplogBetweenTimestamps takes two timestamps and writer and dumps all oplog
// entries between the given timestamp to the writer. Returns any errors that occur.
func (dump *MongoDump) DumpOplogBetweenTimestamps(start, end primitive.Timestamp) error {
session, err := dump.SessionProvider.GetSession()
if err != nil {
return err
}
queryObj := bson.M{"$and": []bson.M{
{"ts": bson.M{"$gte": start}},
{"ts": bson.M{"$lte": end}},
}}
oplogQuery := &db.DeferredQuery{
Coll: session.Database("local").Collection(dump.oplogCollection),
Filter: queryObj,
LogReplay: true,
}
oplogCount, err := dump.dumpValidatedQueryToIntent(oplogQuery, dump.manager.Oplog(), dump.getResettableOutputBuffer(), oplogDocumentValidator)
if err == nil {
log.Logvf(log.Always, "\tdumped %v oplog %v",
oplogCount, util.Pluralize(int(oplogCount), "entry", "entries"))
}
return err
}
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