| // 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 driver |
| |
| import ( |
| "context" |
| |
| "github.com/mongodb/mongo-go-driver/mongo/options" |
| "github.com/mongodb/mongo-go-driver/x/bsonx" |
| |
| "github.com/mongodb/mongo-go-driver/mongo/writeconcern" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/topology" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/uuid" |
| "github.com/mongodb/mongo-go-driver/x/network/command" |
| "github.com/mongodb/mongo-go-driver/x/network/description" |
| "github.com/mongodb/mongo-go-driver/x/network/result" |
| ) |
| |
| // Delete handles the full cycle dispatch and execution of a delete command against the provided |
| // topology. |
| func Delete( |
| ctx context.Context, |
| cmd command.Delete, |
| topo *topology.Topology, |
| selector description.ServerSelector, |
| clientID uuid.UUID, |
| pool *session.Pool, |
| retryWrite bool, |
| opts ...*options.DeleteOptions, |
| ) (result.Delete, error) { |
| |
| ss, err := topo.SelectServer(ctx, selector) |
| if err != nil { |
| return result.Delete{}, err |
| } |
| |
| // If no explicit session and deployment supports sessions, start implicit session. |
| if cmd.Session == nil && topo.SupportsSessions() && writeconcern.AckWrite(cmd.WriteConcern) { |
| cmd.Session, err = session.NewClientSession(pool, clientID, session.Implicit) |
| if err != nil { |
| return result.Delete{}, err |
| } |
| defer cmd.Session.EndSession() |
| } |
| |
| deleteOpts := options.MergeDeleteOptions(opts...) |
| if deleteOpts.Collation != nil { |
| if ss.Description().WireVersion.Max < 5 { |
| return result.Delete{}, ErrCollation |
| } |
| cmd.Opts = append(cmd.Opts, bsonx.Elem{"collation", bsonx.Document(deleteOpts.Collation.ToDocument())}) |
| } |
| |
| // Execute in a single trip if retry writes not supported, or retry not enabled |
| if !retrySupported(topo, ss.Description(), cmd.Session, cmd.WriteConcern) || !retryWrite { |
| if cmd.Session != nil { |
| cmd.Session.RetryWrite = false // explicitly set to false to prevent encoding transaction number |
| } |
| return delete(ctx, cmd, ss, nil) |
| } |
| |
| cmd.Session.RetryWrite = retryWrite |
| cmd.Session.IncrementTxnNumber() |
| |
| res, originalErr := delete(ctx, cmd, ss, nil) |
| |
| // Retry if appropriate |
| if cerr, ok := originalErr.(command.Error); ok && cerr.Retryable() || |
| res.WriteConcernError != nil && command.IsWriteConcernErrorRetryable(res.WriteConcernError) { |
| ss, err := topo.SelectServer(ctx, selector) |
| |
| // Return original error if server selection fails or new server does not support retryable writes |
| if err != nil || !retrySupported(topo, ss.Description(), cmd.Session, cmd.WriteConcern) { |
| return res, originalErr |
| } |
| |
| return delete(ctx, cmd, ss, cerr) |
| } |
| return res, originalErr |
| } |
| |
| func delete( |
| ctx context.Context, |
| cmd command.Delete, |
| ss *topology.SelectedServer, |
| oldErr error, |
| ) (result.Delete, error) { |
| desc := ss.Description() |
| |
| conn, err := ss.Connection(ctx) |
| if err != nil { |
| if oldErr != nil { |
| return result.Delete{}, oldErr |
| } |
| return result.Delete{}, err |
| } |
| |
| if !writeconcern.AckWrite(cmd.WriteConcern) { |
| go func() { |
| defer func() { _ = recover() }() |
| defer conn.Close() |
| |
| _, _ = cmd.RoundTrip(ctx, desc, conn) |
| }() |
| |
| return result.Delete{}, command.ErrUnacknowledgedWrite |
| } |
| defer conn.Close() |
| |
| return cmd.RoundTrip(ctx, desc, conn) |
| } |