Handling Aerospike library errors in Go Lang

Question

I am quite new to Go Lang development. Recently I am using Aerospike Go client to getObject

err = aer.AeroDB.getObject(nil, key, Record)
if err != nil {
    fmt.Println(err)
}

now the above error exposes only one method Error() which returns a string. I need to handle each type of errors differently. How do I do this, as there are no error codes returned. Do I do string matching to get the relevant type?

SOLUTION: Answer and comments below helped me to find an exact answer. I will share it here with the rest. Aerospike libraries export AerospikeError struct. Now, error could be nil or AerospikeError struct. Following code did the work.

import (
  "errors"
  "fmt"
  aerospike "github.com/aerospike/aerospike-client-go"
  "github.com/aerospike/aerospike-client-go/types"
 )

type ArDB struct {
  Host   string
  Port   int
  AeroDB *aerospike.Client
}

ArErr, failed := aer.AeroDB.GetObject(nil, key, Record).(types.AerospikeError)
if failed {
    if ArErr.ResultCode() == types.KEY_NOT_FOUND_ERROR {
        //Key is not present, create new data
        Record = NewAudienceRecord()
    } else {
        //Handle other errors!
    }
}

Answer 1

If the function returns errors which are actually of different type, then you should use type switch:

switch err.(type) {
case Error1:
    fmt.Println("Error1", err)
case Error2:
    fmt.Println("Error2", err)
default:
    fmt.Println(err)
}

But if the errors are of same type then you have to see does the package export some "common errors" as variables, so that you can check against those:

if err == aer.Error1 {
   // do something specific to Error1
}