| // 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" |
| |
| "fmt" |
| |
| "github.com/mongodb/mongo-go-driver/bson" |
| "github.com/mongodb/mongo-go-driver/mongo/readpref" |
| "github.com/mongodb/mongo-go-driver/x/bsonx" |
| "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| "github.com/mongodb/mongo-go-driver/x/network/description" |
| "github.com/mongodb/mongo-go-driver/x/network/result" |
| "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| ) |
| |
| // GetLastError represents the getLastError command. |
| // |
| // The getLastError command is used for getting the last |
| // error from the last command on a connection. |
| // |
| // Since GetLastError only makes sense in the context of |
| // a single connection, there is no Dispatch method. |
| type GetLastError struct { |
| Clock *session.ClusterClock |
| Session *session.Client |
| |
| err error |
| res result.GetLastError |
| } |
| |
| // Encode will encode this command into a wire message for the given server description. |
| func (gle *GetLastError) Encode() (wiremessage.WireMessage, error) { |
| encoded, err := gle.encode() |
| if err != nil { |
| return nil, err |
| } |
| return encoded.Encode(description.SelectedServer{}) |
| } |
| |
| func (gle *GetLastError) encode() (*Read, error) { |
| // This can probably just be a global variable that we reuse. |
| cmd := bsonx.Doc{{"getLastError", bsonx.Int32(1)}} |
| |
| return &Read{ |
| Clock: gle.Clock, |
| DB: "admin", |
| ReadPref: readpref.Secondary(), |
| Session: gle.Session, |
| Command: cmd, |
| }, nil |
| } |
| |
| // 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 (gle *GetLastError) Decode(wm wiremessage.WireMessage) *GetLastError { |
| reply, ok := wm.(wiremessage.Reply) |
| if !ok { |
| gle.err = fmt.Errorf("unsupported response wiremessage type %T", wm) |
| return gle |
| } |
| rdr, err := decodeCommandOpReply(reply) |
| if err != nil { |
| gle.err = err |
| return gle |
| } |
| return gle.decode(rdr) |
| } |
| |
| func (gle *GetLastError) decode(rdr bson.Raw) *GetLastError { |
| err := bson.Unmarshal(rdr, &gle.res) |
| if err != nil { |
| gle.err = err |
| return gle |
| } |
| |
| return gle |
| } |
| |
| // Result returns the result of a decoded wire message and server description. |
| func (gle *GetLastError) Result() (result.GetLastError, error) { |
| if gle.err != nil { |
| return result.GetLastError{}, gle.err |
| } |
| |
| return gle.res, nil |
| } |
| |
| // Err returns the error set on this command. |
| func (gle *GetLastError) Err() error { return gle.err } |
| |
| // RoundTrip handles the execution of this command using the provided wiremessage.ReadWriter. |
| func (gle *GetLastError) RoundTrip(ctx context.Context, rw wiremessage.ReadWriter) (result.GetLastError, error) { |
| cmd, err := gle.encode() |
| if err != nil { |
| return result.GetLastError{}, err |
| } |
| |
| rdr, err := cmd.RoundTrip(ctx, description.SelectedServer{}, rw) |
| if err != nil { |
| return result.GetLastError{}, err |
| } |
| |
| return gle.decode(rdr).Result() |
| } |