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service.go
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service.go
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package pubsubsse
import (
"sync"
"github.com/apex/log"
"github.com/google/uuid"
)
type funcClient func(*Client)
// SSEPubSubService represents the SSE publisher and subscriber system.
type SSEPubSubService struct {
clients map[string]*Client
publicTopics map[string]*Topic
groups map[string]*Group
lock sync.Mutex
// Events:
eventsOnNewClient map[string]funcClient
}
// NewSSEPubSub creates a new sSEPubSubService instance.
func NewSSEPubSubService() *SSEPubSubService {
return &SSEPubSubService{
clients: make(map[string]*Client),
publicTopics: make(map[string]*Topic),
groups: make(map[string]*Group),
lock: sync.Mutex{},
eventsOnNewClient: make(map[string]funcClient),
}
}
// Create new client
func (s *SSEPubSubService) NewClient() *Client {
// Lock the sSEPubSubService
s.lock.Lock()
c := newClient(s)
s.clients[c.GetID()] = c
s.lock.Unlock()
// Emit event
s.emitOnNewClient(c)
return c
}
// Event: When client is created
func (s *SSEPubSubService) OnNewClient(f funcClient) string {
// Lock the sSEPubSubService
s.lock.Lock()
defer s.lock.Unlock()
id := uuid.New().String()
// Add f to eventsOnNewClient map
s.eventsOnNewClient[id] = f
return id
}
// Emit Event: When client is created
func (s *SSEPubSubService) emitOnNewClient(c *Client) {
// Lock the sSEPubSubService
s.lock.Lock()
defer s.lock.Unlock()
// Emit event
for _, f := range s.eventsOnNewClient {
go f(c)
}
}
// Remove Event: When client is created
func (s *SSEPubSubService) RemoveOnNewClient(id string) {
// Lock the sSEPubSubService
s.lock.Lock()
defer s.lock.Unlock()
// Remove f from eventsOnNewClient map
delete(s.eventsOnNewClient, id)
}
// Remove client
// 1. Unsubscribe from all topics
// 2. Remove all private topics
// 3. Stop the client
// 4. Remove client from sSEPubSubService
func (s *SSEPubSubService) RemoveClient(c *Client) {
// Unsubscribe from all topics
alltopics := c.GetAllTopics()
for _, t := range alltopics {
if err := c.Unsub(t); err != nil {
log.Errorf("[C:%s]: Error unsubscribing from topic %s: %s", c.GetID(), t.GetName(), err)
}
}
// Remove all private topics
for _, t := range c.GetPrivateTopics() {
c.RemovePrivateTopic(t)
}
// stop the client
c.stop()
// Lock the sSEPubSubService
s.lock.Lock()
defer s.lock.Unlock()
// Remove client from sSEPubSubService
delete(s.clients, c.GetID())
}
// Add Group
// 0. Check if group already exists, return it if it does
// 1. Create a new group
// 2. Add the group to the sSEPubSubService
func (s *SSEPubSubService) NewGroup(name string) *Group {
// Check if group already exists, return it if it does
if g, ok := s.GetGroupByName(name); ok {
return g
}
// Create a new group
g := newGroup(name)
// Add the group to the sSEPubSubService
s.lock.Lock()
s.groups[g.GetName()] = g
s.lock.Unlock()
return g
}
// Remove group
// 0. Check if group exists in sSEPubSubService
// 1. Remove all topics from the group
// 2. Remove all clients from the group
// 3. Remove group from sSEPubSubService
func (s *SSEPubSubService) RemoveGroup(g *Group) {
// Check if group exists in sSEPubSubService
checkIfExist := func() bool {
if group, ok := s.GetGroupByName(g.GetName()); ok {
if group == g {
return true
}
}
return false
}
if !checkIfExist() {
log.Errorf("Group %s does not exist in sSEPubSubService", g.GetName())
return
}
// Remove all topics from the group
for _, t := range g.GetTopics() {
g.RemoveTopic(t)
}
// Remove all clients from the group
for _, c := range g.GetClients() {
g.RemoveClient(c)
}
// Remove group from sSEPubSubService
s.lock.Lock()
delete(s.groups, g.GetName())
s.lock.Unlock()
}
// Get groups
func (s *SSEPubSubService) GetGroups() map[string]*Group {
s.lock.Lock()
defer s.lock.Unlock()
// Create a copy of the map
newmap := make(map[string]*Group)
for k, v := range s.groups {
newmap[k] = v
}
return newmap
}
// Get group by name
func (s *SSEPubSubService) GetGroupByName(name string) (*Group, bool) {
s.lock.Lock()
defer s.lock.Unlock()
g, ok := s.groups[name]
return g, ok
}
// Get clients
func (s *SSEPubSubService) GetClients() map[string]*Client {
s.lock.Lock()
defer s.lock.Unlock()
// Create a copy of the map
newmap := make(map[string]*Client)
for k, v := range s.clients {
newmap[k] = v
}
return newmap
}
// Get client by ID
func (s *SSEPubSubService) GetClientByID(id string) (*Client, bool) {
s.lock.Lock()
defer s.lock.Unlock()
c, ok := s.clients[id]
return c, ok
}
// Create new public topic
// 0. Check if topic already exists, return it if it does
// 1. Create a new public topic
// 2. Add the topic to the sSEPubSubService
// 3. Inform all clients about the new topic
func (s *SSEPubSubService) NewPublicTopic(name string) *Topic {
// Check if topic already exists, return it if it does
if t, ok := s.GetPublicTopicByName(name); ok {
return t
}
// Create a new public topic
t := newTopic(name, TPublic)
s.lock.Lock()
s.publicTopics[t.GetName()] = t
s.lock.Unlock()
// Inform all clients about the new topic
for _, c := range s.GetClients() {
if err := c.sendTopicList(); err != nil {
log.Errorf("[C:%s]: Error sending new topic to client: %s", c.id, err)
}
}
return t
}
// Remove public topic
// 0. Check if topic is public
// 1. Unsubscribe all clients from the topic
// 2. Check if topic exists in sSEPubSubService
// 3. Remove topic from sSEPubSubService
// 4. Inform all clients about the removed topic by sending the new topic list
func (s *SSEPubSubService) RemovePublicTopic(t *Topic) {
// Check if topic is public
if t.GetType() != string(TPublic) {
log.Errorf("Topic %s is not public", t.GetName())
return
}
// Check if topic exists in sSEPubSubService
checkIfExist := func() bool {
if top, ok := s.GetPublicTopicByName(t.GetName()); ok {
if top == t {
return true
}
}
return false
}
if !checkIfExist() {
log.Errorf("Topic %s does not exist in sSEPubSubService", t.GetName())
return
}
// Remove this topic from all clients
for _, c := range t.GetClients() {
if err := c.Unsub(t); err != nil {
log.Errorf("[C:%s]: Error unsubscribing from topic %s: %s", c.GetID(), t.GetName(), err)
}
}
// Remove topic from sSEPubSubService
s.lock.Lock()
delete(s.publicTopics, t.GetName())
s.lock.Unlock()
// Inform all clients about the removed topic by sending the new topic list
for _, c := range s.GetClients() {
if err := c.sendTopicList(); err != nil {
log.Errorf("[C:%s]: Error sending new topic to client: %s", c.id, err)
}
}
}
// Get public topics
func (s *SSEPubSubService) GetPublicTopics() map[string]*Topic {
s.lock.Lock()
defer s.lock.Unlock()
// Create a copy of the map
newmap := make(map[string]*Topic)
for k, v := range s.publicTopics {
newmap[k] = v
}
return newmap
}
// Get public topic by name
func (s *SSEPubSubService) GetPublicTopicByName(name string) (*Topic, bool) {
s.lock.Lock()
defer s.lock.Unlock()
t, ok := s.publicTopics[name]
return t, ok
}