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op_delete.go
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op_delete.go
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package mongoproto
import (
"fmt"
"io"
"github.com/mongodb/mongo-tools/common/bsonutil"
"github.com/mongodb/mongo-tools/common/json"
"gopkg.in/mgo.v2/bson"
)
const (
OpDeleteSingleRemove OpDeleteFlags = 1 << iota
)
type OpDeleteFlags int32
// OpDelete is used to remove one or more documents from a collection.
// http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/#op-delete
type OpDelete struct {
Header MsgHeader
FullCollectionName string // "dbname.collectionname"
Flags OpDeleteFlags
Selector []byte // the query to select the document(s)
}
func (op *OpDelete) String() string {
var query interface{}
if err := bson.Unmarshal(op.Selector, &query); err != nil {
return "(error unmarshalling)"
}
queryAsJSON, err := bsonutil.ConvertBSONValueToJSON(query)
if err != nil {
return fmt.Sprintf("ConvertBSONValueToJSON err: %#v - %v", op, err)
}
asJSON, err := json.Marshal(queryAsJSON)
if err != nil {
return fmt.Sprintf("json marshal err: %#v - %v", op, err)
}
return fmt.Sprintf("OpDelete %v %v", op.FullCollectionName, string(asJSON))
}
func (op *OpDelete) OpCode() OpCode {
return OpCodeDelete
}
func (op *OpDelete) FromReader(r io.Reader) error {
var b [4]byte
_, err := io.ReadFull(r, b[:])
if err != nil {
return err
}
op.Flags = OpDeleteFlags(getInt32(b[:], 0))
name, err := readCStringFromReader(r)
if err != nil {
return err
}
op.FullCollectionName = string(name)
op.Selector, err = ReadDocument(r)
if err != nil {
return err
}
if int(op.Header.MessageLength) > len(op.Selector) + len(op.FullCollectionName) + 1 + 8 + MsgHeaderLen {
data, err := ReadDocument(r)
if err != nil {
return err
}
op.Selector = append(op.Selector, data...)
}
return nil
}