How to read error from HTTP response body

Question

This is how error looks like, I just need "Body" when I try fmt.Println(err)

Console

Expected HTTP response code [200] when accessing [POST http://controller:8774/v2.1/os-keypairs], but got 409 instead
{"conflictingRequest": {"message": "Key pair 'Darkhaa test hi' already exists.", "code": 409}}

Controller

createKeyPair, err := compute.CreateKeypair(raw["keyPairName"].(string))

if err != nil {
    fmt.Println(err)
    lists["retType"] = -1
    lists["retDesc"] = err
} else {
    lists["retType"] = 0
    lists["retDesc"] = ""
    lists["retData"] = createKeyPair
}

i.Data["json"] = lists

Nik · Accepted Answer · 2019-03-27 11:31:18Z

1

type ErrorStruct struct {
    ConflictingRequest struct {
        Message string `json:"message"`
        Code    int    `json:"code"`
    } `json:"conflictingRequest"`
}

go func() {
    _, err := compute.CreateKeypair(raw["keyPairName"].(string))
    if err != nil {
        re := regexp.MustCompile("\\{(.*?)\\}")
        match := re.FindStringSubmatch(err.Error())
        data := ErrorStruct{}
        json.Unmarshal([]byte(match[1]), data)
        log.Printf("Message: %s", data.Message)
    }
}

edited Mar 27, 2019 at 11:31

Nik

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answered Mar 27, 2019 at 9:18

elcomendante

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6 Comments

Elliot Over a year ago

cannot use err (type error) as type string in argument to re.FindStringSubmatch

Elliot Over a year ago

data.Message undefined (type ErrorStruct has no field or method Message)

elcomendante Over a year ago

use err.Error()

elcomendante Over a year ago

type error interface { Error() string } you can get string out of error by following error intrface

elcomendante Over a year ago

i edited code re.FindStringSubmatch(err.Error())

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