/
drop_collection.go
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/
drop_collection.go
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// Copyright (C) MongoDB, Inc. 2019-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 operation
import (
"context"
"errors"
"fmt"
"time"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/internal/driverutil"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/mongo/writeconcern"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
)
// DropCollection performs a drop operation.
type DropCollection struct {
session *session.Client
clock *session.ClusterClock
collection string
monitor *event.CommandMonitor
crypt driver.Crypt
database string
deployment driver.Deployment
selector description.ServerSelector
writeConcern *writeconcern.WriteConcern
result DropCollectionResult
serverAPI *driver.ServerAPIOptions
timeout *time.Duration
}
// DropCollectionResult represents a dropCollection result returned by the server.
type DropCollectionResult struct {
// The number of indexes in the dropped collection.
NIndexesWas int32
// The namespace of the dropped collection.
Ns string
}
func buildDropCollectionResult(response bsoncore.Document) (DropCollectionResult, error) {
elements, err := response.Elements()
if err != nil {
return DropCollectionResult{}, err
}
dcr := DropCollectionResult{}
for _, element := range elements {
switch element.Key() {
case "nIndexesWas":
var ok bool
dcr.NIndexesWas, ok = element.Value().AsInt32OK()
if !ok {
return dcr, fmt.Errorf("response field 'nIndexesWas' is type int32, but received BSON type %s", element.Value().Type)
}
case "ns":
var ok bool
dcr.Ns, ok = element.Value().StringValueOK()
if !ok {
return dcr, fmt.Errorf("response field 'ns' is type string, but received BSON type %s", element.Value().Type)
}
}
}
return dcr, nil
}
// NewDropCollection constructs and returns a new DropCollection.
func NewDropCollection() *DropCollection {
return &DropCollection{}
}
// Result returns the result of executing this operation.
func (dc *DropCollection) Result() DropCollectionResult { return dc.result }
func (dc *DropCollection) processResponse(info driver.ResponseInfo) error {
var err error
dc.result, err = buildDropCollectionResult(info.ServerResponse)
return err
}
// Execute runs this operations and returns an error if the operation did not execute successfully.
func (dc *DropCollection) Execute(ctx context.Context) error {
if dc.deployment == nil {
return errors.New("the DropCollection operation must have a Deployment set before Execute can be called")
}
return driver.Operation{
CommandFn: dc.command,
ProcessResponseFn: dc.processResponse,
Client: dc.session,
Clock: dc.clock,
CommandMonitor: dc.monitor,
Crypt: dc.crypt,
Database: dc.database,
Deployment: dc.deployment,
Selector: dc.selector,
WriteConcern: dc.writeConcern,
ServerAPI: dc.serverAPI,
Timeout: dc.timeout,
Name: driverutil.DropOp,
}.Execute(ctx)
}
func (dc *DropCollection) command(dst []byte, _ description.SelectedServer) ([]byte, error) {
dst = bsoncore.AppendStringElement(dst, "drop", dc.collection)
return dst, nil
}
// Session sets the session for this operation.
func (dc *DropCollection) Session(session *session.Client) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.session = session
return dc
}
// ClusterClock sets the cluster clock for this operation.
func (dc *DropCollection) ClusterClock(clock *session.ClusterClock) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.clock = clock
return dc
}
// Collection sets the collection that this command will run against.
func (dc *DropCollection) Collection(collection string) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.collection = collection
return dc
}
// CommandMonitor sets the monitor to use for APM events.
func (dc *DropCollection) CommandMonitor(monitor *event.CommandMonitor) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.monitor = monitor
return dc
}
// Crypt sets the Crypt object to use for automatic encryption and decryption.
func (dc *DropCollection) Crypt(crypt driver.Crypt) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.crypt = crypt
return dc
}
// Database sets the database to run this operation against.
func (dc *DropCollection) Database(database string) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.database = database
return dc
}
// Deployment sets the deployment to use for this operation.
func (dc *DropCollection) Deployment(deployment driver.Deployment) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.deployment = deployment
return dc
}
// ServerSelector sets the selector used to retrieve a server.
func (dc *DropCollection) ServerSelector(selector description.ServerSelector) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.selector = selector
return dc
}
// WriteConcern sets the write concern for this operation.
func (dc *DropCollection) WriteConcern(writeConcern *writeconcern.WriteConcern) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.writeConcern = writeConcern
return dc
}
// ServerAPI sets the server API version for this operation.
func (dc *DropCollection) ServerAPI(serverAPI *driver.ServerAPIOptions) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.serverAPI = serverAPI
return dc
}
// Timeout sets the timeout for this operation.
func (dc *DropCollection) Timeout(timeout *time.Duration) *DropCollection {
if dc == nil {
dc = new(DropCollection)
}
dc.timeout = timeout
return dc
}