| // 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 ( |
| "github.com/mongodb/mongo-go-driver/bson" |
| "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| ) |
| |
| // decodeCommandOpReply handles decoding the OP_REPLY response to an OP_QUERY |
| // command. |
| func decodeCommandOpReply(reply wiremessage.Reply) (bson.Raw, error) { |
| if reply.NumberReturned == 0 { |
| return nil, ErrNoDocCommandResponse |
| } |
| if reply.NumberReturned > 1 { |
| return nil, ErrMultiDocCommandResponse |
| } |
| if len(reply.Documents) != 1 { |
| return nil, NewCommandResponseError("malformed OP_REPLY: NumberReturned does not match number of documents returned", nil) |
| } |
| rdr := reply.Documents[0] |
| err := rdr.Validate() |
| if err != nil { |
| return nil, NewCommandResponseError("malformed OP_REPLY: invalid document", err) |
| } |
| if reply.ResponseFlags&wiremessage.QueryFailure == wiremessage.QueryFailure { |
| return nil, QueryFailureError{ |
| Message: "command failure", |
| Response: reply.Documents[0], |
| } |
| } |
| |
| err = extractError(rdr) |
| if err != nil { |
| return nil, err |
| } |
| return rdr, nil |
| } |