53 lines
1.7 KiB
Go
53 lines
1.7 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 module
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import (
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"sync"
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"github.com/elastic/beats/libbeat/beat"
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)
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// PublishChannels publishes the events read from each channel to the given
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// publisher client. If the publisher client blocks for any reason then events
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// will not be read from the given channels.
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//
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// This method blocks until all of the channels have been closed
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// and are fully read. To stop the method immediately, close the channels and
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// close the publisher client to ensure that publishing does not block. This
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// may result is some events being discarded.
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func PublishChannels(client beat.Client, cs ...<-chan beat.Event) {
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var wg sync.WaitGroup
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// output publishes values from c until c is closed, then calls wg.Done.
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output := func(c <-chan beat.Event) {
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defer wg.Done()
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for event := range c {
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client.Publish(event)
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}
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}
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// Start an output goroutine for each input channel in cs.
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wg.Add(len(cs))
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for _, c := range cs {
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go output(c)
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}
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wg.Wait()
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}
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