143 lines
3.7 KiB
Go
143 lines
3.7 KiB
Go
/*
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* Copyright (c) 2018 Jeffrey Walter <jeffreydwalter@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
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* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package arlo
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import (
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"bytes"
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"encoding/json"
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"net/http"
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"sync"
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"github.com/pkg/errors"
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"github.com/r3labs/sse"
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)
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var (
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FAILED_TO_PUBLISH = errors.New("failed to publish")
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FAILED_TO_DECODE_JSON = errors.New("failed to decode json")
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FAILED_TO_SUBSCRIBE = errors.New("failed to subscribe to seeclient")
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)
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type subscriber chan *EventStreamResponse
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type subscribers map[string]subscriber
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type subscriptions struct {
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subscribers
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rwmutex sync.RWMutex
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}
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type eventStream struct {
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SSEClient *sse.Client
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Events chan *sse.Event
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Error chan error
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Verbose bool
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Disconnected chan interface{}
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once *sync.Once
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subscriptions
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}
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func newEventStream(url string, client *http.Client) *eventStream {
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SSEClient := sse.NewClient(url)
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SSEClient.Connection = client
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return &eventStream{
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SSEClient: SSEClient,
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Events: make(chan *sse.Event),
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subscriptions: subscriptions{make(map[string]subscriber), sync.RWMutex{}},
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Error: make(chan error),
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Disconnected: make(chan interface{}),
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once: new(sync.Once),
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}
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}
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func (e *eventStream) disconnect() {
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e.once.Do(func() {
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close(e.Disconnected)
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})
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}
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func (e *eventStream) listen() (connected chan bool) {
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connected = make(chan bool)
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go func() {
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err := e.SSEClient.SubscribeChanRaw(e.Events)
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if err != nil {
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e.Error <- FAILED_TO_SUBSCRIBE
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}
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for {
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select {
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case event := <-e.Events:
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/*
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fmt.Println("Got event message.")
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fmt.Printf("EVENT: %s\n", event.Event)
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fmt.Printf("DATA: %s\n", event.URL)
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*/
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if event.Data != nil {
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notifyResponse := &EventStreamResponse{}
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b := bytes.NewBuffer(event.Data)
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err := json.NewDecoder(b).Decode(notifyResponse)
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if err != nil {
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e.Error <- FAILED_TO_DECODE_JSON
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break
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}
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if notifyResponse.Status == "connected" {
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connected <- true
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} else if notifyResponse.Status == "disconnected" {
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e.disconnect()
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} else {
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e.subscriptions.rwmutex.RLock()
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subscriber, ok := e.subscribers[notifyResponse.TransId]
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e.subscriptions.rwmutex.RUnlock()
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if ok {
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subscriber <- notifyResponse
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}
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}
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}
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case <-e.Disconnected:
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connected <- false
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return
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}
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}
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}()
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return connected
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}
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func (s *subscriptions) unsubscribe(transId string) {
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s.rwmutex.Lock()
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defer s.rwmutex.Unlock()
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if _, ok := s.subscribers[transId]; ok {
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close(s.subscribers[transId])
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delete(s.subscribers, transId)
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}
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}
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func (s *subscriptions) subscribe(transId string, subscriber subscriber) {
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s.rwmutex.Lock()
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s.subscribers[transId] = subscriber
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s.rwmutex.Unlock()
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}
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