/
targetlist.go
189 lines (160 loc) · 4.33 KB
/
targetlist.go
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// Copyright (c) 2015-2023 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"
"net/http"
"strings"
"sync"
)
// Target - lambda target interface
type Target interface {
ID() TargetID
IsActive() (bool, error)
Send(Event) (*http.Response, error)
Stat() TargetStat
Close() error
}
// TargetStats is a collection of stats for multiple targets.
type TargetStats struct {
TargetStats map[string]TargetStat
}
// TargetStat is the stats of a single target.
type TargetStat struct {
ID TargetID
ActiveRequests int64
TotalRequests int64
FailedRequests int64
}
// TargetList - holds list of targets indexed by target ID.
type TargetList struct {
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
}
// Lookup - checks whether target by target ID exists is valid or not.
func (list *TargetList) Lookup(arnStr string) (Target, error) {
list.RLock()
defer list.RUnlock()
arn, err := ParseARN(arnStr)
if err != nil {
return nil, err
}
id, found := list.targets[arn.TargetID]
if !found {
return nil, &ErrARNNotFound{}
}
return id, nil
}
// 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 := make([]Target, 0, len(list.targets))
for _, tgt := range list.targets {
targets = append(targets, tgt)
}
return targets
}
// Empty returns true if targetList is empty.
func (list *TargetList) Empty() bool {
list.RLock()
defer list.RUnlock()
return len(list.targets) == 0
}
// List - returns available target IDs.
func (list *TargetList) List(region string) []ARN {
list.RLock()
defer list.RUnlock()
keys := make([]ARN, 0, len(list.targets))
for k := range list.targets {
keys = append(keys, k.ToARN(region))
}
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, id TargetID) (*http.Response, error) {
list.RLock()
target, ok := list.targets[id]
list.RUnlock()
if ok {
return target.Send(event)
}
return nil, ErrARNNotFound{}
}
// Stats returns stats for targets.
func (list *TargetList) Stats() TargetStats {
t := TargetStats{}
if list == nil {
return t
}
list.RLock()
defer list.RUnlock()
t.TargetStats = make(map[string]TargetStat, len(list.targets))
for id, target := range list.targets {
t.TargetStats[strings.ReplaceAll(id.String(), ":", "_")] = target.Stat()
}
return t
}
// NewTargetList - creates TargetList.
func NewTargetList() *TargetList {
return &TargetList{targets: make(map[TargetID]Target)}
}