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 | "github.com/mongodb/mongo-go-driver/bson" |
| 11 | "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| 12 | ) |
| 13 | |
| 14 | // decodeCommandOpReply handles decoding the OP_REPLY response to an OP_QUERY |
| 15 | // command. |
| 16 | func decodeCommandOpReply(reply wiremessage.Reply) (bson.Raw, error) { |
| 17 | if reply.NumberReturned == 0 { |
| 18 | return nil, ErrNoDocCommandResponse |
| 19 | } |
| 20 | if reply.NumberReturned > 1 { |
| 21 | return nil, ErrMultiDocCommandResponse |
| 22 | } |
| 23 | if len(reply.Documents) != 1 { |
| 24 | return nil, NewCommandResponseError("malformed OP_REPLY: NumberReturned does not match number of documents returned", nil) |
| 25 | } |
| 26 | rdr := reply.Documents[0] |
| 27 | err := rdr.Validate() |
| 28 | if err != nil { |
| 29 | return nil, NewCommandResponseError("malformed OP_REPLY: invalid document", err) |
| 30 | } |
| 31 | if reply.ResponseFlags&wiremessage.QueryFailure == wiremessage.QueryFailure { |
| 32 | return nil, QueryFailureError{ |
| 33 | Message: "command failure", |
| 34 | Response: reply.Documents[0], |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | err = extractError(rdr) |
| 39 | if err != nil { |
| 40 | return nil, err |
| 41 | } |
| 42 | return rdr, nil |
| 43 | } |