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memory.go
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memory.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells 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.
*
* Pydio Cells 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 Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package memory
import (
"context"
"errors"
"fmt"
"math/rand"
"net"
"os"
"sync"
"time"
"github.com/cskr/pubsub"
"github.com/micro/go-micro/broker"
"github.com/micro/misc/lib/addr"
)
var (
PubSubBufferCapacity = 10000
)
type memoryBroker struct {
sync.RWMutex
opts broker.Options
addr string
connected bool
bus *pubsub.PubSub
useTryPub bool
}
type memorySubscriber struct {
topic string
exit chan bool
opts broker.SubscribeOptions
}
func (m *memoryBroker) Options() broker.Options {
return m.opts
}
func (m *memoryBroker) Address() string {
return m.addr
}
func (m *memoryBroker) Connect() error {
m.Lock()
defer m.Unlock()
if m.connected {
return nil
}
m.bus = pubsub.New(PubSubBufferCapacity)
// use 127.0.0.1 to avoid scan of all network interfaces
add, err := addr.Extract("127.0.0.1")
if err != nil {
return err
}
i := rand.Intn(20000)
// set add with port
add = net.JoinHostPort(add, fmt.Sprintf("%d", 10000+i))
m.addr = add
m.connected = true
return nil
}
func (m *memoryBroker) Disconnect() error {
m.Lock()
defer m.Unlock()
if !m.connected {
return nil
}
m.connected = false
m.bus.Shutdown()
return nil
}
func (m *memoryBroker) Init(opts ...broker.Option) error {
for _, o := range opts {
o(&m.opts)
}
return nil
}
func (m *memoryBroker) Publish(topic string, msg *broker.Message, opts ...broker.PublishOption) error {
m.RLock()
if !m.connected {
m.RUnlock()
return errors.New("not connected")
}
m.RUnlock()
// Clone message before publication
cM := &broker.Message{
Header: make(map[string]string, len(msg.Header)),
Body: make([]byte, len(msg.Body)),
}
for k, v := range msg.Header {
cM.Header[k] = v
}
copy(cM.Body, msg.Body)
if m.useTryPub {
m.bus.TryPub(cM, topic)
} else {
m.bus.Pub(cM, topic)
}
return nil
}
func (m *memoryBroker) Subscribe(topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
m.RLock()
if !m.connected {
m.RUnlock()
return nil, errors.New("not connected")
}
m.RUnlock()
var options broker.SubscribeOptions
for _, o := range opts {
o(&options)
}
listener := m.bus.Sub(topic)
sub := &memorySubscriber{
exit: make(chan bool, 1),
topic: topic,
opts: options,
}
go func() {
defer m.bus.Unsub(listener, topic)
for {
select {
case msg := <-listener:
handler(memoryEventWithClonedMessage(topic, msg))
case <-sub.exit:
return
}
}
}()
return sub, nil
}
func (m *memoryBroker) String() string {
return "memory"
}
func (m *memorySubscriber) Options() broker.SubscribeOptions {
return m.opts
}
func (m *memorySubscriber) Topic() string {
return m.topic
}
func (m *memorySubscriber) Unsubscribe() error {
m.exit <- true
return nil
}
type memoryEvent struct {
topic string
err error
message *broker.Message
}
func (s *memoryEvent) Topic() string {
return s.topic
}
func (s *memoryEvent) Message() *broker.Message {
return s.message
}
func (s *memoryEvent) Ack() error {
return nil
}
// memoryEventWithClonedMessage creates a clone of msg and populate a memoryEvent with it
func memoryEventWithClonedMessage(topic string, msg interface{}) *memoryEvent {
pM := msg.(*broker.Message)
cM := &broker.Message{
Header: make(map[string]string, len(pM.Header)),
Body: make([]byte, len(pM.Body)),
}
for k, v := range pM.Header {
cM.Header[k] = v
}
copy(cM.Body, pM.Body)
return &memoryEvent{
topic: topic,
message: cM,
}
}
func NewBroker(opts ...broker.Option) broker.Broker {
options := broker.Options{
Context: context.Background(),
}
rand.Seed(time.Now().UnixNano())
for _, o := range opts {
o(&options)
}
var useTryPub bool
if os.Getenv("CELLS_BROKER_TRYPUB") == "true" {
useTryPub = true
fmt.Println("[broker] Starting broker in TryPub mode")
}
return &memoryBroker{
opts: options,
useTryPub: useTryPub,
}
}