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97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"sync"
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"time"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/pkg/log"
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)
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type refresher struct {
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refreshInterval time.Duration
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intervalDone chan struct{}
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intervalInitOnce sync.Once
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eh EventHandler
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fetchFunc func() error
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stopOnce sync.Once
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wg sync.WaitGroup
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}
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func newRefresher(interval time.Duration, fetchFunc func() error) *refresher {
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return &refresher{
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refreshInterval: interval,
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intervalDone: make(chan struct{}),
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fetchFunc: fetchFunc,
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}
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}
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func (r *refresher) start(name string) {
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if r.refreshInterval > 0 {
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r.intervalInitOnce.Do(func() {
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r.wg.Add(1)
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go r.refreshPeriodically(name)
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})
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}
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}
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func (r *refresher) stop() {
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r.stopOnce.Do(func() {
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close(r.intervalDone)
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r.wg.Wait()
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})
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}
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func (r *refresher) refreshPeriodically(name string) {
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defer r.wg.Done()
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ticker := time.NewTicker(r.refreshInterval)
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defer ticker.Stop()
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log.Info("start refreshing configurations", zap.String("source", name))
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for {
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select {
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case <-ticker.C:
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err := r.fetchFunc()
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if err != nil {
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log.Error("can not pull configs", zap.Error(err))
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r.stop()
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}
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case <-r.intervalDone:
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log.Info("stop refreshing configurations")
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return
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}
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}
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}
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func (r *refresher) fireEvents(name string, source, target map[string]string) error {
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events, err := PopulateEvents(name, source, target)
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if err != nil {
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log.Warn("generating event error", zap.Error(err))
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return err
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}
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//Generate OnEvent Callback based on the events created
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if r.eh != nil {
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for _, e := range events {
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r.eh.OnEvent(e)
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}
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}
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return nil
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}
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