plugins/client/kafka/client_sniffer.go

// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package kafka

import (
	"context"
	"time"

	"github.com/apache/skywalking-satellite/plugins/client/api"
)

// snifferBrokerStatus would sniffer the broker status to notify the listeners.
func (c *Client) snifferBrokerStatus() {
	ctx, cancel := context.WithCancel(c.ctx)
	defer cancel()
	timeTicker := time.NewTicker(time.Duration(c.RefreshPeriod) * time.Minute)
	for {
		select {
		case <-timeTicker.C:
			brokers := c.client.Brokers()
			if len(brokers) == 0 && c.status == api.Connected {
				c.status = api.Disconnect
				c.notify()
			} else if len(brokers) > 0 && c.status == api.Disconnect {
				c.status = api.Connected
				c.notify()
			}
		case <-ctx.Done():
			timeTicker.Stop()
			return
		}
	}
}

// notify the current status to the listeners.
func (c *Client) notify() {
	for _, listener := range c.listeners {
		listener <- c.status
	}
}