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How to use logtailConn method of cloudapi Package

Best K6 code snippet using cloudapi.logtailConn

logs.go

Source:logs.go

...91		fields[key] = val92	}93	return fields94}95func (c *Config) logtailConn(ctx context.Context, referenceID string, since time.Time) (*websocket.Conn, error) {96	u, err := url.Parse(c.LogsTailURL.String)97	if err != nil {98		return nil, fmt.Errorf("couldn't parse cloud logs host %w", err)99	}100	u.RawQuery = fmt.Sprintf(`query={test_run_id="%s"}&start=%d`, referenceID, since.UnixNano())101	headers := make(http.Header)102	headers.Add("Sec-WebSocket-Protocol", "token="+c.Token.String)103	var conn *websocket.Conn104	err = retry(sleeperFunc(time.Sleep), 3, 5*time.Second, 2*time.Minute, func() (err error) {105		// We don't need to close the http body or use it for anything until we want to actually log106		// what the server returned as body when it errors out107		conn, _, err = websocket.DefaultDialer.DialContext(ctx, u.String(), headers) //nolint:bodyclose108		return err109	})110	if err != nil {111		return nil, err112	}113	return conn, nil114}115// StreamLogsToLogger streams the logs for the configured test to the provided logger until ctx is116// Done or an error occurs.117func (c *Config) StreamLogsToLogger(118	ctx context.Context, logger logrus.FieldLogger, referenceID string, tailFrom time.Duration,119) error {120	var mconn sync.Mutex121	conn, err := c.logtailConn(ctx, referenceID, time.Now().Add(-tailFrom))122	if err != nil {123		return err124	}125	go func() {126		<-ctx.Done()127		mconn.Lock()128		defer mconn.Unlock()129		_ = conn.WriteControl(130			websocket.CloseMessage,131			websocket.FormatCloseMessage(websocket.CloseGoingAway, "closing"),132			time.Now().Add(time.Second))133		_ = conn.Close()134	}()135	msgBuffer := make(chan []byte, 10)136	defer close(msgBuffer)137	var mostRecent int64138	go func() {139		for message := range msgBuffer {140			var m msg141			err := easyjson.Unmarshal(message, &m)142			if err != nil {143				logger.WithError(err).Errorf("couldn't unmarshal a message from the cloud: %s", string(message))144				continue145			}146			ts := m.Log(logger)147			atomic.StoreInt64(&mostRecent, ts)148		}149	}()150	for {151		_, message, err := conn.ReadMessage()152		select { // check if we should stop before continuing153		case <-ctx.Done():154			return nil155		default:156		}157		if err != nil {158			logger.WithError(err).Warn("error reading a log message from the cloud, trying to establish a fresh connection with the logs service...") //nolint:lll159			var since time.Time160			if ts := atomic.LoadInt64(&mostRecent); ts > 0 {161				// add 1ns for avoid possible repetition162				since = time.Unix(0, ts).Add(time.Nanosecond)163			} else {164				since = time.Now()165			}166			// TODO: avoid the "logical" race condition167			// The case explained:168			// * The msgBuffer consumer is slow169			// * ReadMessage is fast and adds at least one more message in the buffer170			// * An error is got in the meantime and the re-dialing procedure is tried171			// * Then the latest timestamp used will not be the real latest received172			// * because it is still waiting to be processed.173			// In the case the connection will be restored then the first message will be a duplicate.174			newconn, errd := c.logtailConn(ctx, referenceID, since)175			if errd != nil {176				// return the main error177				return err178			}179			mconn.Lock()180			conn = newconn181			mconn.Unlock()182			continue183		}184		select {185		case <-ctx.Done():186			return nil187		case msgBuffer <- message:188		}...

logtailConn

Using AI Code Generation

1import (2func main() {3    logtailConn, err := client.LogtailConn("myinstance")4    if err != nil {5        panic(err)6    }7    fmt.Println(logtailConn)8}

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