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 command |
| 8 | |
| 9 | import ( |
| 10 | "context" |
| 11 | |
| 12 | "github.com/mongodb/mongo-go-driver/bson" |
| 13 | "github.com/mongodb/mongo-go-driver/x/bsonx" |
| 14 | "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| 15 | "github.com/mongodb/mongo-go-driver/x/network/description" |
| 16 | "github.com/mongodb/mongo-go-driver/x/network/result" |
| 17 | "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| 18 | ) |
| 19 | |
| 20 | // CommitTransaction represents the commitTransaction() command |
| 21 | type CommitTransaction struct { |
| 22 | Session *session.Client |
| 23 | err error |
| 24 | result result.TransactionResult |
| 25 | } |
| 26 | |
| 27 | // Encode will encode this command into a wiremessage for the given server description. |
| 28 | func (ct *CommitTransaction) Encode(desc description.SelectedServer) (wiremessage.WireMessage, error) { |
| 29 | cmd := ct.encode(desc) |
| 30 | return cmd.Encode(desc) |
| 31 | } |
| 32 | |
| 33 | func (ct *CommitTransaction) encode(desc description.SelectedServer) *Write { |
| 34 | cmd := bsonx.Doc{{"commitTransaction", bsonx.Int32(1)}} |
| 35 | return &Write{ |
| 36 | DB: "admin", |
| 37 | Command: cmd, |
| 38 | Session: ct.Session, |
| 39 | WriteConcern: ct.Session.CurrentWc, |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | // Decode will decode the wire message using the provided server description. Errors during decoding are deferred until |
| 44 | // either the Result or Err methods are called. |
| 45 | func (ct *CommitTransaction) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *CommitTransaction { |
| 46 | rdr, err := (&Write{}).Decode(desc, wm).Result() |
| 47 | if err != nil { |
| 48 | ct.err = err |
| 49 | return ct |
| 50 | } |
| 51 | |
| 52 | return ct.decode(desc, rdr) |
| 53 | } |
| 54 | |
| 55 | func (ct *CommitTransaction) decode(desc description.SelectedServer, rdr bson.Raw) *CommitTransaction { |
| 56 | ct.err = bson.Unmarshal(rdr, &ct.result) |
| 57 | if ct.err == nil && ct.result.WriteConcernError != nil { |
| 58 | ct.err = Error{ |
| 59 | Code: int32(ct.result.WriteConcernError.Code), |
| 60 | Message: ct.result.WriteConcernError.ErrMsg, |
| 61 | } |
| 62 | } |
| 63 | return ct |
| 64 | } |
| 65 | |
| 66 | // Result returns the result of a decoded wire message and server description. |
| 67 | func (ct *CommitTransaction) Result() (result.TransactionResult, error) { |
| 68 | if ct.err != nil { |
| 69 | return result.TransactionResult{}, ct.err |
| 70 | } |
| 71 | |
| 72 | return ct.result, nil |
| 73 | } |
| 74 | |
| 75 | // Err returns the error set on this command |
| 76 | func (ct *CommitTransaction) Err() error { |
| 77 | return ct.err |
| 78 | } |
| 79 | |
| 80 | // RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter |
| 81 | func (ct *CommitTransaction) RoundTrip(ctx context.Context, desc description.SelectedServer, rw wiremessage.ReadWriter) (result.TransactionResult, error) { |
| 82 | cmd := ct.encode(desc) |
| 83 | rdr, err := cmd.RoundTrip(ctx, desc, rw) |
| 84 | if err != nil { |
| 85 | return result.TransactionResult{}, err |
| 86 | } |
| 87 | |
| 88 | return ct.decode(desc, rdr).Result() |
| 89 | } |