Restruct (#34)

* modify

* remove

* modify

* modify

* remove no use

* add online/offline notification

* modify

* format log

* add reference

lib/sessions/memprovider.go

@@ -0,0 +1,76 @@
+// Copyright (c) 2014 The SurgeMQ 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 sessions
+
+import (
+	"fmt"
+	"sync"
+)
+
+var _ SessionsProvider = (*memProvider)(nil)
+
+func init() {
+	Register("mem", NewMemProvider())
+}
+
+type memProvider struct {
+	st map[string]*Session
+	mu sync.RWMutex
+}
+
+func NewMemProvider() *memProvider {
+	return &memProvider{
+		st: make(map[string]*Session),
+	}
+}
+
+func (this *memProvider) New(id string) (*Session, error) {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	this.st[id] = &Session{id: id}
+	return this.st[id], nil
+}
+
+func (this *memProvider) Get(id string) (*Session, error) {
+	this.mu.RLock()
+	defer this.mu.RUnlock()
+
+	sess, ok := this.st[id]
+	if !ok {
+		return nil, fmt.Errorf("store/Get: No session found for key %s", id)
+	}
+
+	return sess, nil
+}
+
+func (this *memProvider) Del(id string) {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+	delete(this.st, id)
+}
+
+func (this *memProvider) Save(id string) error {
+	return nil
+}
+
+func (this *memProvider) Count() int {
+	return len(this.st)
+}
+
+func (this *memProvider) Close() error {
+	this.st = make(map[string]*Session)
+	return nil
+}

lib/sessions/redisprovider.go

@@ -0,0 +1,95 @@
+package sessions
+
+import (
+	"time"
+
+	log "github.com/cihub/seelog"
+	"github.com/go-redis/redis"
+	jsoniter "github.com/json-iterator/go"
+)
+
+var redisClient *redis.Client
+var _ SessionsProvider = (*redisProvider)(nil)
+
+const (
+	sessionName = "session"
+)
+
+type redisProvider struct {
+}
+
+func init() {
+	Register("redis", NewRedisProvider())
+}
+
+func InitRedisConn(url string) {
+	redisClient = redis.NewClient(&redis.Options{
+		Addr:     "127.0.0.1:6379",
+		Password: "", // no password set
+		DB:       0,  // use default DB
+	})
+	err := redisClient.Ping().Err()
+	for err != nil {
+		log.Error("connect redis error: ", err, " 3s try again...")
+		time.Sleep(3 * time.Second)
+		err = redisClient.Ping().Err()
+	}
+}
+
+func NewRedisProvider() *redisProvider {
+	return &redisProvider{}
+}
+
+func (r *redisProvider) New(id string) (*Session, error) {
+	val, _ := jsoniter.Marshal(&Session{id: id})
+
+	err := redisClient.HSet(sessionName, id, val).Err()
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := redisClient.HGet(sessionName, id).Bytes()
+	if err != nil {
+		return nil, err
+	}
+
+	sess := Session{}
+	err = jsoniter.Unmarshal(result, &sess)
+	if err != nil {
+		return nil, err
+	}
+
+	return &sess, nil
+}
+
+func (r *redisProvider) Get(id string) (*Session, error) {
+
+	result, err := redisClient.HGet(sessionName, id).Bytes()
+	if err != nil {
+		return nil, err
+	}
+
+	sess := Session{}
+	err = jsoniter.Unmarshal(result, &sess)
+	if err != nil {
+		return nil, err
+	}
+
+	return &sess, nil
+}
+
+func (r *redisProvider) Del(id string) {
+	redisClient.HDel(sessionName, id)
+}
+
+func (r *redisProvider) Save(id string) error {
+	return nil
+}
+
+func (r *redisProvider) Count() int {
+	return int(redisClient.HLen(sessionName).Val())
+}
+
+func (r *redisProvider) Close() error {
+	return redisClient.Del(sessionName).Err()
+}

lib/sessions/session.go

@@ -0,0 +1,149 @@
+package sessions
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/eclipse/paho.mqtt.golang/packets"
+)
+
+const (
+	// Queue size for the ack queue
+	defaultQueueSize = 16
+)
+
+type Session struct {
+
+	// cmsg is the CONNECT message
+	cmsg *packets.ConnectPacket
+
+	// Will message to publish if connect is closed unexpectedly
+	Will *packets.PublishPacket
+
+	// Retained publish message
+	Retained *packets.PublishPacket
+
+	// topics stores all the topis for this session/client
+	topics map[string]byte
+
+	// Initialized?
+	initted bool
+
+	// Serialize access to this session
+	mu sync.Mutex
+
+	id string
+}
+
+func (this *Session) Init(msg *packets.ConnectPacket) error {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	if this.initted {
+		return fmt.Errorf("Session already initialized")
+	}
+
+	this.cmsg = msg
+
+	if this.cmsg.WillFlag {
+		this.Will = packets.NewControlPacket(packets.Publish).(*packets.PublishPacket)
+		this.Will.Qos = this.cmsg.Qos
+		this.Will.TopicName = this.cmsg.WillTopic
+		this.Will.Payload = this.cmsg.WillMessage
+		this.Will.Retain = this.cmsg.WillRetain
+	}
+
+	this.topics = make(map[string]byte, 1)
+
+	this.id = string(msg.ClientIdentifier)
+
+	this.initted = true
+
+	return nil
+}
+
+func (this *Session) Update(msg *packets.ConnectPacket) error {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	this.cmsg = msg
+	return nil
+}
+
+func (this *Session) RetainMessage(msg *packets.PublishPacket) error {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	this.Retained = msg
+
+	return nil
+}
+
+func (this *Session) AddTopic(topic string, qos byte) error {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	if !this.initted {
+		return fmt.Errorf("Session not yet initialized")
+	}
+
+	this.topics[topic] = qos
+
+	return nil
+}
+
+func (this *Session) RemoveTopic(topic string) error {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	if !this.initted {
+		return fmt.Errorf("Session not yet initialized")
+	}
+
+	delete(this.topics, topic)
+
+	return nil
+}
+
+func (this *Session) Topics() ([]string, []byte, error) {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+
+	if !this.initted {
+		return nil, nil, fmt.Errorf("Session not yet initialized")
+	}
+
+	var (
+		topics []string
+		qoss   []byte
+	)
+
+	for k, v := range this.topics {
+		topics = append(topics, k)
+		qoss = append(qoss, v)
+	}
+
+	return topics, qoss, nil
+}
+
+func (this *Session) ID() string {
+	return this.cmsg.ClientIdentifier
+}
+
+func (this *Session) WillFlag() bool {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+	return this.cmsg.WillFlag
+}
+
+func (this *Session) SetWillFlag(v bool) {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+	this.cmsg.WillFlag = v
+}
+
+func (this *Session) CleanSession() bool {
+	this.mu.Lock()
+	defer this.mu.Unlock()
+	return this.cmsg.CleanSession
+}

lib/sessions/sessions.go

@@ -0,0 +1,92 @@
+package sessions
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+)
+
+var (
+	ErrSessionsProviderNotFound = errors.New("Session: Session provider not found")
+	ErrKeyNotAvailable          = errors.New("Session: not item found for key.")
+
+	providers = make(map[string]SessionsProvider)
+)
+
+type SessionsProvider interface {
+	New(id string) (*Session, error)
+	Get(id string) (*Session, error)
+	Del(id string)
+	Save(id string) error
+	Count() int
+	Close() error
+}
+
+// Register makes a session provider available by the provided name.
+// If a Register is called twice with the same name or if the driver is nil,
+// it panics.
+func Register(name string, provider SessionsProvider) {
+	if provider == nil {
+		panic("session: Register provide is nil")
+	}
+
+	if _, dup := providers[name]; dup {
+		panic("session: Register called twice for provider " + name)
+	}
+
+	providers[name] = provider
+}
+
+func Unregister(name string) {
+	delete(providers, name)
+}
+
+type Manager struct {
+	p SessionsProvider
+}
+
+func NewManager(providerName string) (*Manager, error) {
+	p, ok := providers[providerName]
+	if !ok {
+		return nil, fmt.Errorf("session: unknown provider %q", providerName)
+	}
+
+	return &Manager{p: p}, nil
+}
+
+func (this *Manager) New(id string) (*Session, error) {
+	if id == "" {
+		id = this.sessionId()
+	}
+	return this.p.New(id)
+}
+
+func (this *Manager) Get(id string) (*Session, error) {
+	return this.p.Get(id)
+}
+
+func (this *Manager) Del(id string) {
+	this.p.Del(id)
+}
+
+func (this *Manager) Save(id string) error {
+	return this.p.Save(id)
+}
+
+func (this *Manager) Count() int {
+	return this.p.Count()
+}
+
+func (this *Manager) Close() error {
+	return this.p.Close()
+}
+
+func (manager *Manager) sessionId() string {
+	b := make([]byte, 15)
+	if _, err := io.ReadFull(rand.Reader, b); err != nil {
+		return ""
+	}
+	return base64.URLEncoding.EncodeToString(b)
+}