/
topics.go
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/
topics.go
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// Copyright (c) 2014 The VolantMQ Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memLockFree
import (
"sync"
"time"
"github.com/VolantMQ/vlapi/mqttp"
"github.com/VolantMQ/vlapi/vlplugin/vlpersistence"
"go.uber.org/zap"
"github.com/VolantMQ/volantmq/configuration"
"github.com/VolantMQ/volantmq/systree"
topicsTypes "github.com/VolantMQ/volantmq/topics/types"
"github.com/VolantMQ/volantmq/types"
)
type provider struct {
// smu sync.RWMutex
root *node
stat systree.TopicsStat
persist vlpersistence.Retained
log *zap.SugaredLogger
wgPublisher sync.WaitGroup
wgPublisherStarted sync.WaitGroup
inbound chan *mqttp.Publish
inRetained chan types.RetainObject
subIn chan topicsTypes.SubscribeReq
unSubIn chan topicsTypes.UnSubscribeReq
onCleanUnsubscribe func([]string)
nodeSubscribers func(sn *node, publishID uintptr, p *publishes)
}
var _ topicsTypes.Provider = (*provider)(nil)
// NewMemProvider returns an new instance of the provider, which is implements the
// TopicsProvider interface. provider is a hidden struct that stores the topic
// subscriptions and retained messages in memory. The content is not persistent so
// when the server goes, everything will be gone. Use with care.
func NewMemProvider(config *topicsTypes.MemConfig) (topicsTypes.Provider, error) {
p := &provider{
stat: config.Stat,
persist: config.Persist,
onCleanUnsubscribe: config.OnCleanUnsubscribe,
inbound: make(chan *mqttp.Publish, 1024*512),
inRetained: make(chan types.RetainObject, 1024*512),
subIn: make(chan topicsTypes.SubscribeReq, 1024*512),
unSubIn: make(chan topicsTypes.UnSubscribeReq, 1024*512),
}
if config.OverlappingSubscriptions {
p.nodeSubscribers = overlappingSubscribers
} else {
p.nodeSubscribers = nonOverlappingSubscribers
}
p.root = newNode(nil)
p.log = configuration.GetLogger().Named("topics").Named(config.Name)
if p.persist != nil {
entries, err := p.persist.Load()
if err != nil && err != vlpersistence.ErrNotFound {
return nil, err
}
for _, d := range entries {
var pkt mqttp.IFace
pkt, _, err = mqttp.Decode(mqttp.ProtocolV50, d.Data)
if err != nil {
p.log.Error("Couldn't decode retained message", zap.Error(err))
} else {
if m, ok := pkt.(*mqttp.Publish); ok {
if len(d.ExpireAt) > 0 {
var tm time.Time
if tm, err = time.Parse(time.RFC3339, d.ExpireAt); err == nil {
m.SetExpireAt(tm)
} else {
p.log.Error("Decode publish expire at", zap.Error(err))
}
}
_ = p.Retain(m) // nolint: errcheck
} else {
p.log.Warn("Unsupported retained message type", zap.String("type", m.Type().Name()))
}
}
}
}
publisherCount := 2
subsCount := 2
unSunCount := 2
p.wgPublisher.Add(publisherCount + subsCount + unSunCount + 1)
p.wgPublisherStarted.Add(publisherCount + subsCount + unSunCount + 1)
for i := 0; i < publisherCount; i++ {
go p.publisher()
}
go p.retainer()
for i := 0; i < subsCount; i++ {
go p.subscriber()
}
for i := 0; i < unSunCount; i++ {
go p.unSubscriber()
}
p.wgPublisherStarted.Wait()
return p, nil
}
func (mT *provider) Subscribe(req topicsTypes.SubscribeReq) topicsTypes.SubscribeResp {
cAllocated := false
if req.Chan == nil {
cAllocated = true
req.Chan = make(chan topicsTypes.SubscribeResp)
}
mT.subIn <- req
resp := <-req.Chan
if cAllocated {
close(req.Chan)
}
return resp
}
func (mT *provider) UnSubscribe(req topicsTypes.UnSubscribeReq) topicsTypes.UnSubscribeResp {
cAllocated := false
if req.Chan == nil {
cAllocated = true
req.Chan = make(chan topicsTypes.UnSubscribeResp)
}
mT.unSubIn <- req
resp := <-req.Chan
if cAllocated {
close(req.Chan)
}
return resp
}
func (mT *provider) Publish(m interface{}) error {
msg, ok := m.(*mqttp.Publish)
if !ok {
return topicsTypes.ErrUnexpectedObjectType
}
mT.inbound <- msg
return nil
}
func (mT *provider) Retain(obj types.RetainObject) error {
mT.inRetained <- obj
return nil
}
func (mT *provider) Retained(filter string) ([]*mqttp.Publish, error) {
var r []*mqttp.Publish
// [MQTT-3.3.1-5]
mT.retainSearch(filter, &r)
return r, nil
}
func (mT *provider) Shutdown() error {
close(mT.inbound)
close(mT.inRetained)
close(mT.subIn)
close(mT.unSubIn)
mT.wgPublisher.Wait()
if mT.persist != nil {
var res []*mqttp.Publish
// [MQTT-3.3.1-5]
mT.retainSearch("#", &res)
mT.retainSearch("/#", &res)
var encoded []*vlpersistence.PersistedPacket
for _, pkt := range res {
// Discard retained expired and QoS0 messages
if expireAt, _, expired := pkt.Expired(); !expired && pkt.QoS() != mqttp.QoS0 {
if buf, err := mqttp.Encode(pkt); err != nil {
mT.log.Error("Couldn't encode retained message", zap.Error(err))
} else {
entry := &vlpersistence.PersistedPacket{
Data: buf,
}
if !expireAt.IsZero() {
entry.ExpireAt = expireAt.Format(time.RFC3339)
}
encoded = append(encoded, entry)
}
}
}
if len(encoded) > 0 {
mT.log.Debug("Storing retained messages", zap.Int("amount", len(encoded)))
if err := mT.persist.Store(encoded); err != nil {
mT.log.Error("Couldn't persist retained messages", zap.Error(err))
}
}
}
mT.root = nil
return nil
}
func (mT *provider) retain(obj types.RetainObject) {
insert := true
switch t := obj.(type) {
case *mqttp.Publish:
// [MQTT-3.3.1-10] [MQTT-3.3.1-7]
if len(t.Payload()) == 0 || t.QoS() == mqttp.QoS0 {
_ = mT.retainRemove(obj.Topic()) // nolint: errcheck
if len(t.Payload()) == 0 {
insert = false
}
}
}
if insert {
mT.retainInsert(obj.Topic(), obj)
}
}
func (mT *provider) subscriber() {
defer mT.wgPublisher.Done()
mT.wgPublisherStarted.Done()
for req := range mT.subIn {
var resp topicsTypes.SubscribeResp
if req.S == nil || req.Params == nil {
resp.Err = topicsTypes.ErrInvalidArgs
} else {
if req.Params.Ops.QoS() > mqttp.QoS2 {
resp.Err = mqttp.ErrInvalidQoS
} else {
resp.Granted = req.Params.Ops.QoS()
exists := mT.subscriptionInsert(req.Filter, req.S, req.Params)
var r []*mqttp.Publish
// [MQTT-3.3.1-5]
rh := req.Params.Ops.RetainHandling()
if (rh == mqttp.RetainHandlingRetain) || ((rh == mqttp.RetainHandlingIfNotExists) && !exists) {
mT.retainSearch(req.Filter, &r)
}
resp.Retained = r
}
}
req.Chan <- resp
}
}
func (mT *provider) unSubscriber() {
defer mT.wgPublisher.Done()
mT.wgPublisherStarted.Done()
for req := range mT.unSubIn {
req.Chan <- topicsTypes.UnSubscribeResp{Err: mT.subscriptionRemove(req.Filter, req.S)}
}
}
func (mT *provider) retainer() {
defer mT.wgPublisher.Done()
mT.wgPublisherStarted.Done()
for obj := range mT.inRetained {
mT.retain(obj)
}
}
func (mT *provider) publisher() {
defer mT.wgPublisher.Done()
mT.wgPublisherStarted.Done()
for msg := range mT.inbound {
pubEntries := publishes{}
mT.subscriptionSearch(msg.Topic(), msg.PublishID(), &pubEntries)
for _, pub := range pubEntries {
for _, e := range pub {
if err := e.s.Publish(msg, e.qos, e.ops, e.ids); err != nil {
mT.log.Error("Publish error", zap.Error(err))
}
e.s.Release()
}
}
}
}