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package mongoreplay
import (
"encoding/json"
"fmt"
"io"
mgo "github.com/10gen/llmgo"
"github.com/10gen/llmgo/bson"
)
// DeleteOp 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 DeleteOp struct {
Header MsgHeader
mgo.DeleteOp
}
// Meta returns metadata about the operation, useful for analysis of traffic.
func (op *DeleteOp) Meta() OpMetadata {
return OpMetadata{
"Delete",
op.Collection,
"",
op.Selector,
}
}
func (op *DeleteOp) String() string {
body, err := op.getOpBodyString()
if err != nil {
return fmt.Sprintf("%v", err)
}
return fmt.Sprintf("DeleteOp %v %v", op.Collection, body)
}
func (op *DeleteOp) getOpBodyString() (string, error) {
jsonDoc, err := ConvertBSONValueToJSON(op.Selector)
if err != nil {
return "", fmt.Errorf("%#v - %v", op, err)
}
selectorAsJSON, _ := json.Marshal(jsonDoc)
return string(selectorAsJSON), nil
}
// Abbreviated returns a serialization of the DeleteOp, abbreviated so it
// doesn't exceed the given number of characters.
func (op *DeleteOp) Abbreviated(chars int) string {
body, err := op.getOpBodyString()
if err != nil {
return fmt.Sprintf("%v", err)
}
return fmt.Sprintf("DeleteOp %v %v", op.Collection, Abbreviate(body, chars))
}
// OpCode returns the OpCode for DeleteOp.
func (op *DeleteOp) OpCode() OpCode {
return OpCodeDelete
}
// FromReader extracts data from a serialized DeleteOp into its concrete
// structure.
func (op *DeleteOp) FromReader(r io.Reader) error {
var b [4]byte
_, err := io.ReadFull(r, b[:]) //skip ZERO
if err != nil {
return err
}
name, err := readCStringFromReader(r)
if err != nil {
return err
}
op.Collection = string(name)
_, err = io.ReadFull(r, b[:]) //Grab the flags
if err != nil {
return err
}
op.Flags = uint32(getInt32(b[:], 0))
selectorAsSlice, err := ReadDocument(r)
if err != nil {
return err
}
op.Selector = &bson.D{}
err = bson.Unmarshal(selectorAsSlice, op.Selector)
if err != nil {
return err
}
return nil
}
// Execute performs the DeleteOp on a given session, yielding the reply when
// successful (and an error otherwise).
func (op *DeleteOp) Execute(socket *mgo.MongoSocket) (Replyable, error) {
if err := mgo.ExecOpWithoutReply(socket, &op.DeleteOp); err != nil {
return nil, err
}
return nil, nil
}
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