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Copy pathtargetlist.go
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234 lines (201 loc) · 5.74 KB
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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 (
"fmt"
"strings"
"sync"
"sync/atomic"
"github.com/minio/minio/internal/store"
)
const (
// The maximum allowed number of concurrent Send() calls to all configured notifications targets
maxConcurrentTargetSendCalls = 20000
)
// 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
}
// TargetStats is a collection of stats for multiple targets.
type TargetStats struct {
// CurrentSendCalls is the number of concurrent async Send calls to all targets
CurrentSendCalls int64
TotalEvents int64
EventsSkipped int64
TargetStats map[string]TargetStat
}
// TargetStat is the stats of a single target.
type TargetStat struct {
ID TargetID
CurrentQueue int // Populated if target has a store.
}
// TargetList - holds list of targets indexed by target ID.
type TargetList struct {
// The number of concurrent async Send calls to all targets
currentSendCalls int64
totalEvents int64
eventsSkipped int64
sync.RWMutex
targets map[TargetID]Target
}
// 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
}
// 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, resCh chan<- TargetIDResult, synchronous bool) {
if atomic.LoadInt64(&list.currentSendCalls) > maxConcurrentTargetSendCalls {
atomic.AddInt64(&list.eventsSkipped, 1)
err := fmt.Errorf("concurrent target notifications exceeded %d", maxConcurrentTargetSendCalls)
for id := range targetIDset {
resCh <- TargetIDResult{ID: id, Err: err}
}
return
}
if synchronous {
list.send(event, targetIDset, resCh)
return
}
go list.send(event, targetIDset, resCh)
}
func (list *TargetList) send(event Event, targetIDset TargetIDSet, resCh chan<- TargetIDResult) {
var wg sync.WaitGroup
for id := range targetIDset {
list.RLock()
target, ok := list.targets[id]
list.RUnlock()
if ok {
wg.Add(1)
go func(id TargetID, target Target) {
atomic.AddInt64(&list.currentSendCalls, 1)
defer atomic.AddInt64(&list.currentSendCalls, -1)
defer wg.Done()
tgtRes := TargetIDResult{ID: id}
if err := target.Save(event); err != nil {
tgtRes.Err = err
}
resCh <- tgtRes
}(id, target)
} else {
resCh <- TargetIDResult{ID: id}
}
}
wg.Wait()
atomic.AddInt64(&list.totalEvents, 1)
}
// Stats returns stats for targets.
func (list *TargetList) Stats() TargetStats {
t := TargetStats{}
if list == nil {
return t
}
t.CurrentSendCalls = atomic.LoadInt64(&list.currentSendCalls)
t.EventsSkipped = atomic.LoadInt64(&list.eventsSkipped)
t.TotalEvents = atomic.LoadInt64(&list.totalEvents)
list.RLock()
defer list.RUnlock()
t.TargetStats = make(map[string]TargetStat, len(list.targets))
for id, target := range list.targets {
ts := TargetStat{ID: id}
if st := target.Store(); st != nil {
ts.CurrentQueue = st.Len()
}
t.TargetStats[strings.ReplaceAll(id.String(), ":", "_")] = ts
}
return t
}
// NewTargetList - creates TargetList.
func NewTargetList() *TargetList {
return &TargetList{targets: make(map[TargetID]Target)}
}