mirror of https://github.com/minio/minio.git
124 lines
2.7 KiB
Go
124 lines
2.7 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may 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, 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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*/
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package target
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import (
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/minio/minio/pkg/event"
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)
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const retryInterval = 3 * time.Second
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// errNotConnected - indicates that the target connection is not active.
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var errNotConnected = errors.New("not connected to target server/service")
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// errLimitExceeded error is sent when the maximum limit is reached.
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var errLimitExceeded = errors.New("the maximum store limit reached")
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// errNoSuchKey error is sent in Get when the key is not found.
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var errNoSuchKey = errors.New("no such key found in store")
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// Store - To persist the events.
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type Store interface {
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Put(event event.Event) error
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Get(key string) (event.Event, error)
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ListN(n int) []string
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Del(key string) error
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Open() error
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}
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// replayEvents - Reads the events from the store and replays.
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func replayEvents(store Store, doneCh <-chan struct{}) <-chan string {
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var names []string
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eventKeyCh := make(chan string)
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go func() {
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retryTimer := time.NewTimer(retryInterval)
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defer retryTimer.Stop()
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defer close(eventKeyCh)
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for {
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names = store.ListN(100)
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for _, name := range names {
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select {
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case eventKeyCh <- strings.TrimSuffix(name, eventExt):
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// Get next key.
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case <-doneCh:
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return
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}
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}
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if len(names) < 2 {
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retryTimer.Reset(retryInterval)
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select {
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case <-retryTimer.C:
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case <-doneCh:
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return
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}
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}
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}
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}()
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return eventKeyCh
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}
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// sendEvents - Reads events from the store and re-plays.
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func sendEvents(target event.Target, eventKeyCh <-chan string, doneCh <-chan struct{}) {
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retryTimer := time.NewTimer(retryInterval)
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defer retryTimer.Stop()
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send := func(eventKey string) bool {
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for {
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err := target.Send(eventKey)
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if err == nil {
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break
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}
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if err != errNotConnected {
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panic(fmt.Errorf("target.Send() failed with '%v'", err))
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}
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retryTimer.Reset(retryInterval)
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select {
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case <-retryTimer.C:
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case <-doneCh:
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return false
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}
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}
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return true
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}
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for {
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select {
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case eventKey, ok := <-eventKeyCh:
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if !ok {
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// closed channel.
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return
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}
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if !send(eventKey) {
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return
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}
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case <-doneCh:
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return
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}
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}
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}
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