|
| 1 | +package boringpoll |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "io" |
| 7 | + "math/rand" |
| 8 | + "net/http" |
| 9 | + "sync" |
| 10 | + "time" |
| 11 | + |
| 12 | + "github.com/qdm12/gluetun/internal/configuration/settings" |
| 13 | +) |
| 14 | + |
| 15 | +type BoringPoll struct { |
| 16 | + // Injected dependencies |
| 17 | + client *http.Client |
| 18 | + logger Logger |
| 19 | + |
| 20 | + // Internal state |
| 21 | + urlToData map[string]*urlData |
| 22 | + |
| 23 | + // Internal signals and channels |
| 24 | + cancel context.CancelFunc |
| 25 | + done <-chan struct{} |
| 26 | + mutex sync.Mutex |
| 27 | +} |
| 28 | + |
| 29 | +type urlData struct{} |
| 30 | + |
| 31 | +func New(client *http.Client, logger Logger, settings settings.BoringPoll) *BoringPoll { |
| 32 | + urlToData := make(map[string]*urlData) |
| 33 | + if *settings.GluetunCom { |
| 34 | + urlToData["https://gluetun.com/wp-json"] = &urlData{} |
| 35 | + } |
| 36 | + return &BoringPoll{ |
| 37 | + client: client, |
| 38 | + logger: logger, |
| 39 | + urlToData: urlToData, |
| 40 | + } |
| 41 | +} |
| 42 | + |
| 43 | +func (b *BoringPoll) Start() (runError <-chan error, err error) { |
| 44 | + b.mutex.Lock() |
| 45 | + defer b.mutex.Unlock() |
| 46 | + |
| 47 | + if len(b.urlToData) == 0 { |
| 48 | + return nil, nil //nolint:nilnil |
| 49 | + } |
| 50 | + |
| 51 | + const minPeriod = time.Minute |
| 52 | + const maxPeriod = 5 * time.Minute |
| 53 | + const logEveryBytes = 100 * 1000 * 1000 // 100 IEC MB |
| 54 | + |
| 55 | + var ready, done sync.WaitGroup |
| 56 | + ready.Add(len(b.urlToData)) |
| 57 | + done.Add(len(b.urlToData)) |
| 58 | + ctx, cancel := context.WithCancel(context.Background()) |
| 59 | + b.cancel = cancel |
| 60 | + for url := range b.urlToData { |
| 61 | + go func(url string) { |
| 62 | + defer done.Done() |
| 63 | + |
| 64 | + b.logger.Infof("running against %s periodically between %s and %s "+ |
| 65 | + "and will log every %s downloaded", |
| 66 | + url, minPeriod, maxPeriod, byteCountSI(logEveryBytes)) |
| 67 | + totalDownloaded := uint64(0) |
| 68 | + lastDownloaded := uint64(0) |
| 69 | + consecutiveFails := 0 |
| 70 | + const maxConsecutiveErrs = 3 |
| 71 | + const coolDownTimeout = time.Hour |
| 72 | + timer := time.NewTimer(time.Hour) |
| 73 | + var err error |
| 74 | + |
| 75 | + ready.Done() |
| 76 | + for { |
| 77 | + timeout := minPeriod + time.Duration(rand.Int63n(int64(maxPeriod-minPeriod))) //nolint:gosec |
| 78 | + if consecutiveFails >= maxConsecutiveErrs { |
| 79 | + b.logger.Debugf("pausing poll to %s for %s due to %d consecutive errors, last error: %s", |
| 80 | + url, coolDownTimeout, consecutiveFails, err) |
| 81 | + timeout = coolDownTimeout |
| 82 | + } |
| 83 | + timer.Reset(timeout) |
| 84 | + select { |
| 85 | + case <-ctx.Done(): |
| 86 | + timer.Stop() |
| 87 | + totalDownloaded += lastDownloaded |
| 88 | + if totalDownloaded > 0 { |
| 89 | + b.logger.Infof("stopping poll to %s, downloaded %s!", url, byteCountSI(totalDownloaded)) |
| 90 | + } |
| 91 | + return |
| 92 | + case <-timer.C: |
| 93 | + } |
| 94 | + |
| 95 | + n, err := fetchURL(ctx, b.client, url) |
| 96 | + if err != nil { |
| 97 | + consecutiveFails++ |
| 98 | + continue |
| 99 | + } |
| 100 | + consecutiveFails = 0 |
| 101 | + totalDownloaded += uint64(n) //nolint:gosec |
| 102 | + lastDownloaded += uint64(n) //nolint:gosec |
| 103 | + if lastDownloaded >= logEveryBytes { |
| 104 | + b.logger.Infof("thanks for helping! Downloaded %s from %s!", |
| 105 | + byteCountSI(totalDownloaded), url) |
| 106 | + lastDownloaded = 0 |
| 107 | + } |
| 108 | + } |
| 109 | + }(url) |
| 110 | + } |
| 111 | + return nil, nil //nolint:nilnil |
| 112 | +} |
| 113 | + |
| 114 | +func fetchURL(ctx context.Context, client *http.Client, url string) (downloaded int64, err error) { |
| 115 | + const requestTimeout = 10 * time.Second |
| 116 | + ctx, cancel := context.WithTimeout(ctx, requestTimeout) |
| 117 | + defer cancel() |
| 118 | + request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) |
| 119 | + if err != nil { |
| 120 | + cancel() |
| 121 | + return 0, err |
| 122 | + } |
| 123 | + request.Header.Set("Cache-Control", "no-cache, no-store, must-revalidate") |
| 124 | + request.Header.Set("Pragma", "no-cache") |
| 125 | + request.Header.Set("Expires", "0") |
| 126 | + request.Header.Set("User-Agent", getRandomUserAgent()) |
| 127 | + |
| 128 | + response, err := client.Do(request) |
| 129 | + if err != nil { |
| 130 | + return 0, err |
| 131 | + } |
| 132 | + downloaded, err = io.Copy(io.Discard, response.Body) |
| 133 | + _ = response.Body.Close() |
| 134 | + if err != nil { |
| 135 | + return 0, err |
| 136 | + } |
| 137 | + return downloaded, nil |
| 138 | +} |
| 139 | + |
| 140 | +func getRandomUserAgent() string { |
| 141 | + //nolint:lll |
| 142 | + userAgents := [...]string{ |
| 143 | + "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36", |
| 144 | + "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36", |
| 145 | + "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36", |
| 146 | + "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0", |
| 147 | + "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15", |
| 148 | + "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Edge/121.0.0.0 Safari/537.36", |
| 149 | + "Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1", |
| 150 | + "Mozilla/5.0 (iPad; CPU OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1", |
| 151 | + "Mozilla/5.0 (Android 14; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0", |
| 152 | + "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Mobile Safari/537.36", |
| 153 | + "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 OPR/106.0.0.0", |
| 154 | + "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 OPR/106.0.0.0", |
| 155 | + "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)", |
| 156 | + "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)", |
| 157 | + } |
| 158 | + return userAgents[rand.Intn(len(userAgents))] //nolint:gosec |
| 159 | +} |
| 160 | + |
| 161 | +func (b *BoringPoll) Stop() error { |
| 162 | + b.mutex.Lock() |
| 163 | + defer b.mutex.Unlock() |
| 164 | + |
| 165 | + if b.cancel == nil { |
| 166 | + return nil |
| 167 | + } |
| 168 | + b.cancel() |
| 169 | + <-b.done |
| 170 | + b.cancel = nil |
| 171 | + b.done = nil |
| 172 | + return nil |
| 173 | +} |
| 174 | + |
| 175 | +func byteCountSI(b uint64) string { |
| 176 | + const unit = 1000 |
| 177 | + if b < unit { |
| 178 | + return fmt.Sprintf("%dB", b) |
| 179 | + } |
| 180 | + |
| 181 | + div, exp := uint64(unit), 0 |
| 182 | + for n := b / unit; n >= unit; n /= unit { |
| 183 | + div *= unit |
| 184 | + exp++ |
| 185 | + } |
| 186 | + |
| 187 | + return fmt.Sprintf("%.1f%cB", float64(b)/float64(div), "kMGTPE"[exp]) |
| 188 | +} |
0 commit comments