Method updateOperations

httptransport/client/matcher.go:193–221

updateOperations is a private method implementing the common bits for retrieving UpdateOperations an ouCache is passed in by the caller to cache any responses providing an etag. if a subsequent response provides a StatusNotModified status, the map of UpdateOprations is served from cache.

(ctx context.Context, req *http.Request, cache *uoCache)

// an ouCache is passed in by the caller to cache any responses providing an etag.
// if a subsequent response provides a StatusNotModified status, the map of UpdateOprations is served from cache.
func (c *HTTP) updateOperations(ctx context.Context, req *http.Request, cache *uoCache) (map[string][]driver.UpdateOperation, error) {
	if err := c.sign(ctx, req); err != nil {
		return nil, fmt.Errorf("failed to create request: %v", err)
	}
	res, err := c.c.Do(req)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()
	switch res.StatusCode {
	case http.StatusOK:
		m := make(map[string][]driver.UpdateOperation)
		dec := codec.GetDecoder(res.Body)
		defer codec.PutDecoder(dec)
		if err := dec.Decode(&m); err != nil {
			return nil, err
		}
		// check for etag, if exists store the value and add returned map
		// to cache
		if v := res.Header.Get("etag"); v != "" && !strings.HasPrefix(v, "W/") {
			cache.Set(m, v)
		}
		return cache.Copy(), nil
	case http.StatusNotModified:
		return cache.Copy(), nil
	default:
	}
	return nil, fmt.Errorf("%v: unexpected status: %s", req.URL.Path, res.Status)
}

// UpdateDiff reports the diff of two update operations, identified by the
// provided refs.