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package gateway
import (
"context"
"math/rand"
"time"
"github.com/rs/zerolog"
)
type Heartbeat interface {
Start(ctx context.Context, interval time.Duration)
Stop()
ForceHeartbeat()
Ack()
}
var _ Heartbeat = &heartbeatImpl{}
type heartbeatImpl struct {
logger *zerolog.Logger
gateway Gateway
cancelRoutine context.CancelFunc
}
func NewHeartbeat(logger *zerolog.Logger, gateway Gateway) *heartbeatImpl {
return &heartbeatImpl{
logger: logger,
gateway: gateway,
cancelRoutine: nil,
}
}
func (h *heartbeatImpl) Start(ctx context.Context, interval time.Duration) {
routineCtx, cancel := context.WithCancel(ctx)
h.cancelRoutine = cancel
go h.heartbeatRoutine(routineCtx, interval)
}
func (h *heartbeatImpl) Stop() {
h.cancelRoutine()
h.cancelRoutine = nil
}
func (h *heartbeatImpl) ForceHeartbeat() {
h.gateway.Heartbeat()
}
func (h *heartbeatImpl) Ack() {
// What do we do here?
h.logger.Debug().Msg("received heartbeat ack")
}
func (h *heartbeatImpl) heartbeatRoutine(ctx context.Context, interval time.Duration) {
h.logger.Debug().Msgf("beating heart every %dms", interval.Milliseconds())
// REF: heartbeat_interval * jitter
jitter := rand.Intn(int(interval))
select {
case <-time.After(time.Duration(jitter)):
case <-ctx.Done():
h.logger.Debug().Msg("heartbeat routine stopped before jitter heartbeat")
return
}
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
h.logger.Debug().Msg("sending heartbeat")
if err := h.gateway.Heartbeat(); err != nil {
h.logger.Error().Err(err).Msg("failed to send heartbeat")
}
select {
case <-ctx.Done():
return
case <-ticker.C:
continue
}
}
}
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