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package db
import (
"fmt"
"github.com/mongodb/mongo-tools/common/bsonutil"
"github.com/mongodb/mongo-tools/common/log"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"strings"
)
// IsNoCmd reeturns true if err indicates a query command is not supported,
// otherwise, returns false.
func IsNoCmd(err error) bool {
e, ok := err.(*mgo.QueryError)
return ok && strings.HasPrefix(e.Message, "no such cmd:")
}
// IsNoCollection returns true if err indicates a query resulted in a "no collection" error
// otherwise, returns false.
func IsNoCollection(err error) bool {
e, ok := err.(*mgo.QueryError)
return ok && e.Message == "no collection"
}
// buildBsonArray takes a cursor iterator and returns an array of
// all of its documents as bson.D objects.
func buildBsonArray(iter *mgo.Iter) ([]bson.D, error) {
ret := make([]bson.D, 0, 0)
index := new(bson.D)
for iter.Next(index) {
ret = append(ret, *index)
index = new(bson.D)
}
if iter.Err() != nil {
return nil, iter.Err()
}
return ret, nil
}
// GetIndexes returns an iterator to thethe raw index info for a collection by
// using the listIndexes command if available, or by falling back to querying
// against system.indexes (pre-3.0 systems). nil is returned if the collection
// does not exist.
func GetIndexes(coll *mgo.Collection) (*mgo.Iter, error) {
var cmdResult struct {
Cursor struct {
FirstBatch []bson.Raw `bson:"firstBatch"`
NS string
Id int64
}
}
err := coll.Database.Run(bson.D{{"listIndexes", coll.Name}, {"cursor", bson.M{}}}, &cmdResult)
switch {
case err == nil:
ns := strings.SplitN(cmdResult.Cursor.NS, ".", 2)
if len(ns) < 2 {
return nil, fmt.Errorf("server returned invalid cursor.ns `%v` on listIndexes for `%v`: %v",
cmdResult.Cursor.NS, coll.FullName, err)
}
ses := coll.Database.Session
return ses.DB(ns[0]).C(ns[1]).NewIter(ses, cmdResult.Cursor.FirstBatch, cmdResult.Cursor.Id, nil), nil
case IsNoCmd(err):
log.Logvf(log.DebugLow, "No support for listIndexes command, falling back to querying system.indexes")
return getIndexesPre28(coll)
case IsNoCollection(err):
return nil, nil
default:
return nil, fmt.Errorf("error running `listIndexes`. Collection: `%v` Err: %v", coll.FullName, err)
}
}
func getIndexesPre28(coll *mgo.Collection) (*mgo.Iter, error) {
indexColl := coll.Database.C("system.indexes")
iter := indexColl.Find(&bson.M{"ns": coll.FullName}).Iter()
return iter, nil
}
func GetCollections(database *mgo.Database, name string) (*mgo.Iter, bool, error) {
var cmdResult struct {
Cursor struct {
FirstBatch []bson.Raw `bson:"firstBatch"`
NS string
Id int64
}
}
command := bson.D{{"listCollections", 1}, {"cursor", bson.M{}}}
if len(name) > 0 {
command = bson.D{{"listCollections", 1}, {"filter", bson.M{"name": name}}, {"cursor", bson.M{}}}
}
err := database.Run(command, &cmdResult)
switch {
case err == nil:
ns := strings.SplitN(cmdResult.Cursor.NS, ".", 2)
if len(ns) < 2 {
return nil, false, fmt.Errorf("server returned invalid cursor.ns `%v` on listCollections for `%v`: %v",
cmdResult.Cursor.NS, database.Name, err)
}
return database.Session.DB(ns[0]).C(ns[1]).NewIter(database.Session, cmdResult.Cursor.FirstBatch, cmdResult.Cursor.Id, nil), false, nil
case IsNoCmd(err):
log.Logvf(log.DebugLow, "No support for listCollections command, falling back to querying system.namespaces")
iter, err := getCollectionsPre28(database, name)
return iter, true, err
default:
return nil, false, fmt.Errorf("error running `listCollections`. Database: `%v` Err: %v",
database.Name, err)
}
}
func getCollectionsPre28(database *mgo.Database, name string) (*mgo.Iter, error) {
indexColl := database.C("system.namespaces")
selector := bson.M{}
if len(name) > 0 {
selector["name"] = database.Name + "." + name
}
iter := indexColl.Find(selector).Iter()
return iter, nil
}
func GetCollectionOptions(coll *mgo.Collection) (*bson.D, error) {
iter, useFullName, err := GetCollections(coll.Database, coll.Name)
if err != nil {
return nil, err
}
defer iter.Close()
comparisonName := coll.Name
if useFullName {
comparisonName = coll.FullName
}
collInfo := &bson.D{}
for iter.Next(collInfo) {
name, err := bsonutil.FindValueByKey("name", collInfo)
if err != nil {
collInfo = nil
continue
}
if nameStr, ok := name.(string); ok {
if nameStr == comparisonName {
// we've found the collection we're looking for
break
}
} else {
collInfo = nil
continue
}
}
if collInfo != nil {
optsInterface, _ := bsonutil.FindValueByKey("options", collInfo)
if optsInterface != nil {
optsD, ok := optsInterface.(bson.D)
if !ok {
return nil, fmt.Errorf("Cannot unmarshal collection options for collection %v.%v", coll.Database, coll.Name)
}
return &optsD, nil
}
}
return nil, iter.Err()
}
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