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kill_cursors.go
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kill_cursors.go
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// Copyright (C) MongoDB, Inc. 2017-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 command
import (
"context"
"github.com/mongodb/mongo-go-driver/bson"
"github.com/mongodb/mongo-go-driver/core/description"
"github.com/mongodb/mongo-go-driver/core/result"
"github.com/mongodb/mongo-go-driver/core/wiremessage"
)
// KillCursors represents the killCursors command.
//
// The killCursors command kills a set of cursors.
type KillCursors struct {
NS Namespace
IDs []int64
result result.KillCursors
err error
}
// Encode will encode this command into a wire message for the given server description.
func (kc *KillCursors) Encode(desc description.SelectedServer) (wiremessage.WireMessage, error) {
idVals := make([]*bson.Value, 0, len(kc.IDs))
for _, id := range kc.IDs {
idVals = append(idVals, bson.VC.Int64(id))
}
cmd := bson.NewDocument(
bson.EC.String("killCursors", kc.NS.Collection),
bson.EC.ArrayFromElements("cursors", idVals...),
)
return (&Command{DB: kc.NS.DB, Command: cmd}).Encode(desc)
}
// Decode will decode the wire message using the provided server description. Errors during decoding
// are deferred until either the Result or Err methods are called.
func (kc *KillCursors) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *KillCursors {
rdr, err := (&Command{}).Decode(desc, wm).Result()
if err != nil {
kc.err = err
return kc
}
err = bson.Unmarshal(rdr, &kc.result)
if err != nil {
kc.err = err
return kc
}
return kc
}
// Result returns the result of a decoded wire message and server description.
func (kc *KillCursors) Result() (result.KillCursors, error) {
if kc.err != nil {
return result.KillCursors{}, kc.err
}
return kc.result, nil
}
// Err returns the error set on this command.
func (kc *KillCursors) Err() error { return kc.err }
// RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter.
func (kc *KillCursors) RoundTrip(ctx context.Context, desc description.SelectedServer, rw wiremessage.ReadWriter) (result.KillCursors, error) {
wm, err := kc.Encode(desc)
if err != nil {
return result.KillCursors{}, err
}
err = rw.WriteWireMessage(ctx, wm)
if err != nil {
return result.KillCursors{}, err
}
wm, err = rw.ReadWireMessage(ctx)
if err != nil {
return result.KillCursors{}, err
}
return kc.Decode(desc, wm).Result()
}