| 26 | }) |
| 27 | |
| 28 | func GetCachedDialer(u *url.URL, next xproxy.Dialer) (xproxy.Dialer, error) { |
| 29 | params, err := url.ParseQuery(u.RawQuery) |
| 30 | if err != nil { |
| 31 | return nil, err |
| 32 | } |
| 33 | if !params.Has("url") { |
| 34 | return nil, errors.New("cached dialer: no \"url\" parameter specified") |
| 35 | } |
| 36 | parsedURL, err := url.Parse(params.Get("url")) |
| 37 | if err != nil { |
| 38 | return nil, fmt.Errorf("unable to parse proxy URL: %w", err) |
| 39 | } |
| 40 | if !params.Has("ttl") { |
| 41 | return nil, errors.New("cached dialer: no \"ttl\" parameter specified") |
| 42 | } |
| 43 | ttl, err := time.ParseDuration(params.Get("ttl")) |
| 44 | if err != nil { |
| 45 | return nil, fmt.Errorf("cached dialer: unable to parse TTL duration %q: %w", params.Get("ttl"), err) |
| 46 | } |
| 47 | item := dialerCache.GetOrCreate( |
| 48 | dialerCacheKey{ |
| 49 | url: params.Get("url"), |
| 50 | next: next, |
| 51 | }, |
| 52 | func() *dialerCacheValue { |
| 53 | dialer, err := xproxy.FromURL(parsedURL, next) |
| 54 | return &dialerCacheValue{ |
| 55 | expires: time.Now().Add(ttl), |
| 56 | dialer: dialer, |
| 57 | err: err, |
| 58 | } |
| 59 | }, |
| 60 | ) |
| 61 | return item.dialer, item.err |
| 62 | } |