Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package driver |
| 8 | |
| 9 | import ( |
| 10 | "context" |
| 11 | |
| 12 | "github.com/mongodb/mongo-go-driver/x/mongo/driver/topology" |
| 13 | "github.com/mongodb/mongo-go-driver/x/network/command" |
| 14 | "github.com/mongodb/mongo-go-driver/x/network/description" |
| 15 | "github.com/mongodb/mongo-go-driver/x/network/result" |
| 16 | ) |
| 17 | |
| 18 | // AbortTransaction handles the full cycle dispatch and execution of abortting a transaction |
| 19 | // against the provided topology. |
| 20 | func AbortTransaction( |
| 21 | ctx context.Context, |
| 22 | cmd command.AbortTransaction, |
| 23 | topo *topology.Topology, |
| 24 | selector description.ServerSelector, |
| 25 | ) (result.TransactionResult, error) { |
| 26 | res, err := abortTransaction(ctx, cmd, topo, selector, nil) |
| 27 | if cerr, ok := err.(command.Error); ok && err != nil { |
| 28 | // Retry if appropriate |
| 29 | if cerr.Retryable() { |
| 30 | res, err = abortTransaction(ctx, cmd, topo, selector, cerr) |
| 31 | } |
| 32 | } |
| 33 | return res, err |
| 34 | } |
| 35 | |
| 36 | func abortTransaction( |
| 37 | ctx context.Context, |
| 38 | cmd command.AbortTransaction, |
| 39 | topo *topology.Topology, |
| 40 | selector description.ServerSelector, |
| 41 | oldErr error, |
| 42 | ) (result.TransactionResult, error) { |
| 43 | ss, err := topo.SelectServer(ctx, selector) |
| 44 | if err != nil { |
| 45 | // If retrying server selection, return the original error if it fails |
| 46 | if oldErr != nil { |
| 47 | return result.TransactionResult{}, oldErr |
| 48 | } |
| 49 | return result.TransactionResult{}, err |
| 50 | } |
| 51 | |
| 52 | desc := ss.Description() |
| 53 | |
| 54 | if oldErr != nil && (!topo.SupportsSessions() || !description.SessionsSupported(desc.WireVersion)) { |
| 55 | // Assuming we are retrying (oldErr != nil), |
| 56 | // if server doesn't support retryable writes, return the original error |
| 57 | // Conditions for retry write support are the same as that of sessions |
| 58 | return result.TransactionResult{}, oldErr |
| 59 | } |
| 60 | |
| 61 | conn, err := ss.Connection(ctx) |
| 62 | if err != nil { |
| 63 | if oldErr != nil { |
| 64 | return result.TransactionResult{}, oldErr |
| 65 | } |
| 66 | return result.TransactionResult{}, err |
| 67 | } |
| 68 | defer conn.Close() |
| 69 | |
| 70 | return cmd.RoundTrip(ctx, desc, conn) |
| 71 | } |