77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package channel
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import (
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"github.com/elastic/beats/filebeat/util"
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"github.com/elastic/beats/libbeat/beat"
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"github.com/elastic/beats/libbeat/common/atomic"
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)
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type outlet struct {
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wg eventCounter
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client beat.Client
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isOpen atomic.Bool
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}
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func newOutlet(client beat.Client, wg eventCounter) *outlet {
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o := &outlet{
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wg: wg,
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client: client,
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isOpen: atomic.MakeBool(true),
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}
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return o
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}
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func (o *outlet) Close() error {
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isOpen := o.isOpen.Swap(false)
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if isOpen {
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return o.client.Close()
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}
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return nil
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}
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func (o *outlet) OnEvent(d *util.Data) bool {
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if !o.isOpen.Load() {
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return false
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}
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event := d.GetEvent()
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if d.HasState() {
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event.Private = d.GetState()
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}
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if o.wg != nil {
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o.wg.Add(1)
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}
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o.client.Publish(event)
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// Note: race condition on shutdown:
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// The underlying beat.Client is asynchronous. Without proper ACK
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// handler we can not tell if the event made it 'through' or the client
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// close has been completed before sending. In either case,
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// we report 'false' here, indicating the event eventually being dropped.
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// Returning false here, prevents the harvester from updating the state
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// to the most recently published events. Therefore, on shutdown the harvester
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// might report an old/outdated state update to the registry, overwriting the
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// most recently
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// published offset in the registry on shutdown.
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return o.isOpen.Load()
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}
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