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error.go

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package mackerel

import (

"encoding/json"

"fmt"

"io"

"net/http"

"strconv"

"time"

)

// APIError represents the error type from Mackerel API.

type APIError struct {

StatusCode int

Message string

// RetryAfter is the duration in the Retry-After header, or zero if the header is absent or invalid.

RetryAfter time.Duration

}

func (err *APIError) Error() string {

return fmt.Sprintf("API request failed: %s", err.Message)

}

func extractErrorMessage(r io.Reader) (errorMessage string, err error) {

bs, err := io.ReadAll(r)

if err != nil {

return "", err

}

var data struct{ Error struct{ Message string } }

err = json.Unmarshal(bs, &data)

if err != nil {

return "", err

}

return data.Error.Message, nil

}

func parseRetryAfter(s string) time.Duration {

if s == "" {

return 0

}

if secs, err := strconv.ParseInt(s, 10, 32); err == nil {

return max(time.Duration(secs)*time.Second, 0)

}

if t, err := http.ParseTime(s); err == nil {

return max(time.Until(t), 0)

}

return 0

}