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doc_reader.go
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doc_reader.go
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package docsyncer
import (
"fmt"
"strings"
"mongoshake/collector/filter"
"mongoshake/common"
LOG "github.com/vinllen/log4go"
"github.com/vinllen/mgo"
"github.com/vinllen/mgo/bson"
"mongoshake/collector/configure"
)
func GetAllNamespace(sources []*utils.MongoSource) (map[utils.NS]bool, error) {
nsSet := make(map[utils.NS]bool)
for _, src := range sources {
nsList, err := getDbNamespace(src.URL)
if err != nil {
return nil, err
}
for _, ns := range nsList {
nsSet[ns] = true
}
}
return nsSet, nil
}
func getDbNamespace(url string) (nsList []utils.NS, err error) {
var conn *utils.MongoConn
if conn, err = utils.NewMongoConn(url, utils.ConnectModeSecondaryPreferred, true); conn == nil || err != nil {
return nil, err
}
defer conn.Close()
var dbNames []string
if dbNames, err = conn.Session.DatabaseNames(); err != nil {
err = fmt.Errorf("get database names of mongodb url=%s error. %v", url, err)
return nil, err
}
filterList := filter.NewDocFilterList()
nsList = make([]utils.NS, 0, 128)
for _, db := range dbNames {
colNames, err := conn.Session.DB(db).CollectionNames()
if err != nil {
err = fmt.Errorf("get collection names of mongodb url=%s error. %v", url, err)
return nil, err
}
for _, col := range colNames {
ns := utils.NS{Database: db, Collection: col}
if strings.HasPrefix(col, "system.") {
continue
}
if filterList.IterateFilter(ns.Str()) {
LOG.Debug("Namespace is filtered. %v", ns.Str())
continue
}
nsList = append(nsList, ns)
}
}
return nsList, nil
}
type DocumentReader struct {
// source mongo address url
src string
ns utils.NS
// mongo document reader
conn *utils.MongoConn
docIterator *mgo.Iter
// query statement and current max cursor
query bson.M
}
// NewDocumentReader creates reader with mongodb url
func NewDocumentReader(src string, ns utils.NS) *DocumentReader {
return &DocumentReader{src: src, ns: ns, query: bson.M{}}
}
// NextDoc returns an document by raw bytes which is []byte
func (reader *DocumentReader) NextDoc() (doc *bson.Raw, err error) {
if err := reader.ensureNetwork(); err != nil {
return nil, err
}
doc = new(bson.Raw)
if !reader.docIterator.Next(doc) {
if err := reader.docIterator.Err(); err != nil {
// some internal error. need rebuild the oplogsIterator
reader.releaseIterator()
return nil, fmt.Errorf("get next doc failed. release oplogsIterator, %v", err)
} else {
return nil, nil
}
}
return doc, nil
}
func (reader *DocumentReader) GetIndexes() ([]mgo.Index, error) {
return reader.conn.Session.DB(reader.ns.Database).C(reader.ns.Collection).Indexes()
}
// ensureNetwork establish the mongodb connection at first
// if current connection is not ready or disconnected
func (reader *DocumentReader) ensureNetwork() (err error) {
if reader.docIterator != nil {
return nil
}
if reader.conn == nil || (reader.conn != nil && !reader.conn.IsGood()) {
if reader.conn != nil {
reader.conn.Close()
}
// reconnect
if reader.conn, err = utils.NewMongoConn(reader.src, conf.Options.MongoConnectMode, true); reader.conn == nil || err != nil {
return err
}
}
// rebuild syncerGroup condition statement with current checkpoint timestamp
reader.conn.Session.SetBatch(8192)
reader.conn.Session.SetPrefetch(0.2)
reader.conn.Session.SetCursorTimeout(0)
reader.docIterator = reader.conn.Session.DB(reader.ns.Database).C(reader.ns.Collection).
Find(reader.query).Iter()
return nil
}
func (reader *DocumentReader) releaseIterator() {
if reader.docIterator != nil {
_ = reader.docIterator.Close()
}
reader.docIterator = nil
}
func (reader *DocumentReader) Close() {
if reader.conn != nil {
reader.conn.Close()
reader.conn = nil
}
}