mirror of https://github.com/minio/minio.git
145 lines
3.5 KiB
Go
145 lines
3.5 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package target
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"syscall"
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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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// 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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List() ([]string, error)
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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{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), id event.TargetID) <-chan string {
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eventKeyCh := make(chan string)
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go func() {
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retryTicker := time.NewTicker(retryInterval)
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defer retryTicker.Stop()
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defer close(eventKeyCh)
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for {
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names, err := store.List()
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if err == nil {
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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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}
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if len(names) < 2 {
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select {
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case <-retryTicker.C:
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if err != nil {
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loggerOnce(context.Background(),
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fmt.Errorf("store.List() failed '%w'", err), id)
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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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}()
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return eventKeyCh
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}
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// IsConnRefusedErr - To check fot "connection refused" error.
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func IsConnRefusedErr(err error) bool {
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return errors.Is(err, syscall.ECONNREFUSED)
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}
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// IsConnResetErr - Checks for connection reset errors.
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func IsConnResetErr(err error) bool {
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if strings.Contains(err.Error(), "connection reset by peer") {
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return true
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}
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// incase if error message is wrapped.
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return errors.Is(err, syscall.ECONNRESET)
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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{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})) {
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retryTicker := time.NewTicker(retryInterval)
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defer retryTicker.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 && !IsConnResetErr(err) {
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loggerOnce(context.Background(),
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fmt.Errorf("target.Send() failed with '%w'", err),
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target.ID())
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}
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// Retrying after 3secs back-off
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select {
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case <-retryTicker.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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