/
targetlist.go
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/
targetlist.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package event
import (
"context"
"fmt"
"runtime"
"sync"
"sync/atomic"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/store"
"github.com/minio/pkg/v2/workers"
)
const (
logSubsys = "notify"
// The maximum allowed number of concurrent Send() calls to all configured notifications targets
maxConcurrentAsyncSend = 50000
)
// Target - event target interface
type Target interface {
ID() TargetID
IsActive() (bool, error)
Save(Event) error
SendFromStore(store.Key) error
Close() error
Store() TargetStore
}
// TargetStore is a shallow version of a target.Store
type TargetStore interface {
Len() int
}
// Stats is a collection of stats for multiple targets.
type Stats struct {
TotalEvents int64 // Deprecated
EventsSkipped int64
CurrentQueuedCalls int64 // Deprecated
EventsErrorsTotal int64 // Deprecated
CurrentSendCalls int64 // Deprecated
TargetStats map[TargetID]TargetStat
}
// TargetStat is the stats of a single target.
type TargetStat struct {
CurrentSendCalls int64 // CurrentSendCalls is the number of concurrent async Send calls to all targets
CurrentQueue int // Populated if target has a store.
TotalEvents int64
FailedEvents int64 // Number of failed events per target
}
// TargetList - holds list of targets indexed by target ID.
type TargetList struct {
// The number of concurrent async Send calls to all targets
currentSendCalls atomic.Int64
totalEvents atomic.Int64
eventsSkipped atomic.Int64
eventsErrorsTotal atomic.Int64
sync.RWMutex
targets map[TargetID]Target
queue chan asyncEvent
ctx context.Context
statLock sync.RWMutex
targetStats map[TargetID]targetStat
}
type targetStat struct {
// The number of concurrent async Send calls per targets
currentSendCalls int64
// The number of total events per target
totalEvents int64
// The number of failed events per target
failedEvents int64
}
func (list *TargetList) getStatsByTargetID(id TargetID) (stat targetStat) {
list.statLock.RLock()
defer list.statLock.RUnlock()
return list.targetStats[id]
}
func (list *TargetList) incCurrentSendCalls(id TargetID) {
list.statLock.Lock()
defer list.statLock.Unlock()
stats, ok := list.targetStats[id]
if !ok {
stats = targetStat{}
}
stats.currentSendCalls++
list.targetStats[id] = stats
return
}
func (list *TargetList) decCurrentSendCalls(id TargetID) {
list.statLock.Lock()
defer list.statLock.Unlock()
stats, ok := list.targetStats[id]
if !ok {
// should not happen
return
}
stats.currentSendCalls--
list.targetStats[id] = stats
return
}
func (list *TargetList) incFailedEvents(id TargetID) {
list.statLock.Lock()
defer list.statLock.Unlock()
stats, ok := list.targetStats[id]
if !ok {
stats = targetStat{}
}
stats.failedEvents++
list.targetStats[id] = stats
return
}
func (list *TargetList) incTotalEvents(id TargetID) {
list.statLock.Lock()
defer list.statLock.Unlock()
stats, ok := list.targetStats[id]
if !ok {
stats = targetStat{}
}
stats.totalEvents++
list.targetStats[id] = stats
return
}
type asyncEvent struct {
ev Event
targetSet TargetIDSet
}
// Add - adds unique target to target list.
func (list *TargetList) Add(targets ...Target) error {
list.Lock()
defer list.Unlock()
for _, target := range targets {
if _, ok := list.targets[target.ID()]; ok {
return fmt.Errorf("target %v already exists", target.ID())
}
list.targets[target.ID()] = target
}
return nil
}
// Exists - checks whether target by target ID exists or not.
func (list *TargetList) Exists(id TargetID) bool {
list.RLock()
defer list.RUnlock()
_, found := list.targets[id]
return found
}
// TargetIDResult returns result of Remove/Send operation, sets err if
// any for the associated TargetID
type TargetIDResult struct {
// ID where the remove or send were initiated.
ID TargetID
// Stores any error while removing a target or while sending an event.
Err error
}
// Remove - closes and removes targets by given target IDs.
func (list *TargetList) Remove(targetIDSet TargetIDSet) {
list.Lock()
defer list.Unlock()
for id := range targetIDSet {
target, ok := list.targets[id]
if ok {
target.Close()
delete(list.targets, id)
}
}
}
// Targets - list all targets
func (list *TargetList) Targets() []Target {
if list == nil {
return []Target{}
}
list.RLock()
defer list.RUnlock()
targets := []Target{}
for _, tgt := range list.targets {
targets = append(targets, tgt)
}
return targets
}
// List - returns available target IDs.
func (list *TargetList) List() []TargetID {
list.RLock()
defer list.RUnlock()
keys := []TargetID{}
for k := range list.targets {
keys = append(keys, k)
}
return keys
}
func (list *TargetList) get(id TargetID) (Target, bool) {
list.RLock()
defer list.RUnlock()
target, ok := list.targets[id]
return target, ok
}
// TargetMap - returns available targets.
func (list *TargetList) TargetMap() map[TargetID]Target {
list.RLock()
defer list.RUnlock()
ntargets := make(map[TargetID]Target, len(list.targets))
for k, v := range list.targets {
ntargets[k] = v
}
return ntargets
}
// Send - sends events to targets identified by target IDs.
func (list *TargetList) Send(event Event, targetIDset TargetIDSet, sync bool) {
if sync {
list.sendSync(event, targetIDset)
} else {
list.sendAsync(event, targetIDset)
}
}
func (list *TargetList) sendSync(event Event, targetIDset TargetIDSet) {
var wg sync.WaitGroup
for id := range targetIDset {
target, ok := list.get(id)
if !ok {
continue
}
wg.Add(1)
go func(id TargetID, target Target) {
list.currentSendCalls.Add(1)
list.incCurrentSendCalls(id)
list.incTotalEvents(id)
defer list.decCurrentSendCalls(id)
defer list.currentSendCalls.Add(-1)
defer wg.Done()
if err := target.Save(event); err != nil {
list.eventsErrorsTotal.Add(1)
list.incFailedEvents(id)
reqInfo := &logger.ReqInfo{}
reqInfo.AppendTags("targetID", id.String())
logger.LogOnceIf(logger.SetReqInfo(context.Background(), reqInfo), logSubsys, err, id.String())
}
}(id, target)
}
wg.Wait()
list.totalEvents.Add(1)
}
func (list *TargetList) sendAsync(event Event, targetIDset TargetIDSet) {
select {
case list.queue <- asyncEvent{
ev: event,
targetSet: targetIDset.Clone(),
}:
case <-list.ctx.Done():
list.eventsSkipped.Add(int64(len(list.queue)))
return
default:
list.eventsSkipped.Add(1)
err := fmt.Errorf("concurrent target notifications exceeded %d, configured notification target is too slow to accept events for the incoming request rate", maxConcurrentAsyncSend)
for id := range targetIDset {
reqInfo := &logger.ReqInfo{}
reqInfo.AppendTags("targetID", id.String())
logger.LogOnceIf(logger.SetReqInfo(context.Background(), reqInfo), logSubsys, err, id.String())
}
return
}
}
// Stats returns stats for targets.
func (list *TargetList) Stats() Stats {
t := Stats{}
if list == nil {
return t
}
t.CurrentSendCalls = list.currentSendCalls.Load()
t.EventsSkipped = list.eventsSkipped.Load()
t.TotalEvents = list.totalEvents.Load()
t.CurrentQueuedCalls = int64(len(list.queue))
t.EventsErrorsTotal = list.eventsErrorsTotal.Load()
list.RLock()
defer list.RUnlock()
t.TargetStats = make(map[TargetID]TargetStat, len(list.targets))
for id, target := range list.targets {
var currentQueue int
if st := target.Store(); st != nil {
currentQueue = st.Len()
}
stats := list.getStatsByTargetID(id)
t.TargetStats[id] = TargetStat{
CurrentSendCalls: stats.currentSendCalls,
CurrentQueue: currentQueue,
FailedEvents: stats.failedEvents,
TotalEvents: stats.totalEvents,
}
}
return t
}
func (list *TargetList) startSendWorkers(workerCount int) {
if workerCount == 0 {
workerCount = runtime.GOMAXPROCS(0)
}
wk, err := workers.New(workerCount)
if err != nil {
panic(err)
}
for i := 0; i < workerCount; i++ {
wk.Take()
go func() {
defer wk.Give()
for {
select {
case av := <-list.queue:
list.sendSync(av.ev, av.targetSet)
case <-list.ctx.Done():
return
}
}
}()
}
wk.Wait()
}
var startOnce sync.Once
// Init initialize target send workers.
func (list *TargetList) Init(workers int) *TargetList {
startOnce.Do(func() {
go list.startSendWorkers(workers)
})
return list
}
// NewTargetList - creates TargetList.
func NewTargetList(ctx context.Context) *TargetList {
list := &TargetList{
targets: make(map[TargetID]Target),
queue: make(chan asyncEvent, maxConcurrentAsyncSend),
targetStats: make(map[TargetID]targetStat),
ctx: ctx,
}
return list
}