Method checkSecondaryRateLimitBeforeDo

github/github.go:1396–1419

checkSecondaryRateLimitBeforeDo does not make any network calls, but uses existing knowledge from current client state in order to quickly check if *AbuseRateLimitError can be immediately returned from Client.Do, and if so, returns it so that Client.Do can skip making a network API call unnecessaril

(req *http.Request)

// from Client.Do, and if so, returns it so that Client.Do can skip making a network API call unnecessarily.
// Otherwise it returns nil, and Client.Do should proceed normally.
func (c *Client) checkSecondaryRateLimitBeforeDo(req *http.Request) *AbuseRateLimitError {
	c.rateMu.Lock()
	secondary := c.secondaryRateLimitReset
	c.rateMu.Unlock()
	if !secondary.IsZero() && time.Now().Before(secondary) {
		// Create a fake response.
		resp := &http.Response{
			Status:     http.StatusText(http.StatusForbidden),
			StatusCode: http.StatusForbidden,
			Request:    req,
			Header:     make(http.Header),
			Body:       io.NopCloser(strings.NewReader("")),
		}

		retryAfter := time.Until(secondary)
		return &AbuseRateLimitError{
			Response:   resp,
			Message:    fmt.Sprintf("API secondary rate limit exceeded until %v, not making remote request.", secondary),
			RetryAfter: &retryAfter,
		}
	}

	return nil
}

// compareHTTPResponse returns whether two http.Response objects are equal or not.
// Currently, only StatusCode is checked. This function is used when implementing the