148 lines
3.3 KiB
Go
148 lines
3.3 KiB
Go
package arlo_golang
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"log"
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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 FAILED_TO_PUBLISH = errors.New("Failed to publish")
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var FAILED_TO_DECODE_JSON = errors.New("Failed to decode JSON")
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var FAILED_TO_SUBSCRIBE = errors.New("Failed to subscribe to SSEClient")
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type Subscriber chan NotifyResponse
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type EventStream struct {
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Registered bool
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Connected bool
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SSEClient *sse.Client
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Events chan *sse.Event
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Subscriptions map[string]*Subscriber
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ErrorChan chan error
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Responses map[string]NotifyResponse
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Verbose bool
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sync.Mutex
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}
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func NewEventStream(url string, headers map[string]string) *EventStream {
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SSEClient := sse.NewClient(url)
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SSEClient.Headers = headers
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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: map[string]*Subscriber{},
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ErrorChan: make(chan error, 1),
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}
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}
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func (e *EventStream) Listen() {
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go func() {
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err := e.SSEClient.SubscribeChan("", e.Events)
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if err != nil {
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fmt.Println(FAILED_TO_SUBSCRIBE)
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e.ErrorChan <- FAILED_TO_SUBSCRIBE
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}
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}()
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for event := range e.Events {
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fmt.Println("Got event message here.")
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fmt.Printf("EVENT: %s\n", event.Event)
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fmt.Printf("DATA: %s\n", event.Data)
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if event.Data != nil {
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notifyResponse := &NotifyResponse{}
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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.ErrorChan <- errors.WithMessage(err, "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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e.Connected = true
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fmt.Println("Connected.")
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break
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}
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}
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}
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go func() {
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for event := range e.Events {
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fmt.Println("Got event message.")
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fmt.Printf("EVENT: %X\n", event.Event)
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fmt.Printf("DATA: %X\n", event.Data)
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if event.Data != nil {
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notifyResponse := &NotifyResponse{}
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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.ErrorChan <- 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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fmt.Println("Connected.")
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e.Connected = true
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} else if notifyResponse.Status == "disconnected" {
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fmt.Println("Disconnected.")
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e.Connected = false
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} else {
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fmt.Printf("Message for transId: %s", notifyResponse.TransId)
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if subscriber, ok := e.Subscriptions[notifyResponse.TransId]; ok {
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e.Lock()
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*subscriber <- *notifyResponse
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close(*subscriber)
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delete(e.Subscriptions, notifyResponse.TransId)
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e.Unlock()
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} else {
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// Throw away the message.
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fmt.Println("Throwing away message.")
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}
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}
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}
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}
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}()
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/*
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go func() {
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fmt.Println("go func to recieve a subscription.")
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for {
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fmt.Println("go func for loop to recieve a subscription.")
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select {
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case s := <-e.Subscriptions:
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if resp, ok := e.Responses[s.transId]; ok {
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fmt.Println("Recieved a subscription, sending response.")
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s.ResponseChan <- resp
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e.Lock()
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delete(e.Responses, s.transId)
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e.Unlock()
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} else {
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fmt.Println("Recieved a subscription error, sending error response.")
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e.ErrorChan <- FAILED_TO_PUBLISH
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break
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}
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}
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}
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}()
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*/
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}
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func (e *EventStream) verbose(params ...interface{}) {
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if e.Verbose {
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log.Println(params...)
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}
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}
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