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events.go
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events.go
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package livebox
import (
"context"
"encoding/json"
"log/slog"
"time"
"github.com/Tomy2e/livebox-api-client/api/request"
"github.com/Tomy2e/livebox-api-client/api/response"
"github.com/Tomy2e/livebox-api-client/internal/client"
)
type events struct {
ChannelID int `json:"channelid"`
Events []string `json:"events"`
}
// Events watches the specified events until context is canceled.
func (c *Client) Events(ctx context.Context, events []string) <-chan *response.Event {
el := &eventListener{
client: c,
events: events,
channel: make(chan *response.Event, 128),
}
go el.Run(ctx)
c.startEventSessionKeepAlive()
return el.channel
}
func (c *Client) requestEvent(ctx context.Context, req *events) (*response.Events, error) {
for {
var events response.Events
if err := c.client.Request(ctx, client.ContentTypeEvent, req, &events); err != nil {
if response.IsChannelDoesNotExistError(err) || response.IsFunctionExecutionFailedError(err) {
req.ChannelID = 0
continue
}
return nil, err
}
return &events, nil
}
}
// startEventSessionKeepAlive starts a goroutine that continuously sends a normal
// livebox request to reauthenticate automatically if needed.
func (c *Client) startEventSessionKeepAlive() {
c.mu.Lock()
defer c.mu.Unlock()
c.eventsCtr++
if c.eventsCtr == 1 {
c.log.Debug("Starting event session keepalive goroutine")
ch := make(chan struct{})
c.eventsStopCh = ch
go func() {
defer close(ch)
for {
out := json.RawMessage{}
if err := c.client.Request(
context.TODO(),
client.ContentTypeWS,
request.New("IoTService", "getStatus", nil),
&out,
); err != nil {
c.log.Debug("Failed to send session keepalive request", slog.Any("error", err))
}
select {
case <-ch:
c.log.Debug("Stopped event session keepalive goroutine")
return
case <-time.After(30 * time.Second):
}
}
}()
}
}
func (c *Client) stopEventSessionKeepAlive() {
c.mu.Lock()
defer c.mu.Unlock()
c.eventsCtr--
if c.eventsCtr == 0 {
c.eventsStopCh <- struct{}{}
}
}
type eventListener struct {
client *Client
channelID int
events []string
channel chan *response.Event
}
func (el *eventListener) Run(ctx context.Context) {
defer el.client.stopEventSessionKeepAlive()
defer close(el.channel)
for {
events, err := el.client.requestEvent(ctx, &events{ChannelID: el.channelID, Events: el.events})
if err != nil {
select {
case <-ctx.Done():
return
default:
}
el.channel <- &response.Event{Error: err}
el.channelID = 0
time.Sleep(1 * time.Second) // TODO: retry with backoff?
continue
}
el.channelID = events.ChannelID
for _, event := range events.Events {
event := event
select {
case <-ctx.Done():
return
case el.channel <- &response.Event{Event: &event.Data}:
}
}
}
}