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reconnection_manager.go
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reconnection_manager.go
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package pubnub
import (
"fmt"
"math"
"sync"
"time"
)
const (
reconnectionInterval = 10
reconnectionMinExponentialBackoff = 1
reconnectionMaxExponentialBackoff = 32
)
// ReconnectionManager is used to store the properties required in running the Reconnection Manager.
type ReconnectionManager struct {
sync.RWMutex
timerMutex sync.RWMutex
ExponentialMultiplier int
FailedCalls int
Milliseconds int
OnReconnection func()
OnMaxReconnectionExhaustion func()
DoneTimer chan bool
hbRunning bool
pubnub *PubNub
exitReconnectionManager chan bool
}
func newReconnectionManager(pubnub *PubNub) *ReconnectionManager {
manager := &ReconnectionManager{}
manager.pubnub = pubnub
manager.ExponentialMultiplier = 1
manager.FailedCalls = 0
manager.Milliseconds = 1000
manager.exitReconnectionManager = make(chan bool)
manager.hbRunning = false
return manager
}
// HandleReconnection sets the handler that will be called when the network reconnects after a disconnect.
func (m *ReconnectionManager) HandleReconnection(handler func()) {
m.Lock()
m.OnReconnection = handler
m.Unlock()
}
// HandleOnMaxReconnectionExhaustion sets the handler that will be called when the max reconnection attempts are exhausted.
func (m *ReconnectionManager) HandleOnMaxReconnectionExhaustion(handler func()) {
m.Lock()
m.OnMaxReconnectionExhaustion = handler
m.Unlock()
}
func (m *ReconnectionManager) startPolling() {
if m.pubnub.Config.PNReconnectionPolicy == PNNonePolicy {
m.pubnub.Config.Log.Println("Reconnection policy is disabled, please handle reconnection manually.")
return
}
m.Lock()
m.ExponentialMultiplier = 1
m.FailedCalls = 0
hbRunning := m.hbRunning
m.Unlock()
if !hbRunning {
m.pubnub.Config.Log.Println(fmt.Sprintf("Reconnection policy: %d, retries: %d", m.pubnub.Config.PNReconnectionPolicy, m.pubnub.Config.MaximumReconnectionRetries))
m.startHeartbeatTimer()
} else {
m.pubnub.Config.Log.Println("hb already running")
}
}
func (m *ReconnectionManager) startHeartbeatTimer() {
timerInterval := reconnectionInterval
for {
m.Lock()
m.hbRunning = true
failedCalls := m.FailedCalls
m.Unlock()
_, status, err := m.pubnub.Time().Execute()
if status.Error == nil {
if failedCalls > 0 {
timerInterval = reconnectionInterval
m.Lock()
m.FailedCalls = 0
m.Unlock()
m.pubnub.Config.Log.Println(fmt.Sprintf("Network reconnected"))
m.OnReconnection()
}
} else {
if m.pubnub.Config.PNReconnectionPolicy == PNExponentialPolicy {
timerInterval = m.getExponentialInterval()
}
m.Lock()
m.FailedCalls++
m.pubnub.Config.Log.Println(fmt.Sprintf("Network disconnected, reconnection try %d of %d\n %v %v", m.FailedCalls, m.pubnub.Config.MaximumReconnectionRetries, status, err))
m.ExponentialMultiplier++
failedCalls := m.FailedCalls
retries := m.pubnub.Config.MaximumReconnectionRetries
m.Unlock()
if retries != -1 && failedCalls >= retries {
m.pubnub.Config.Log.Printf(fmt.Sprintf("Network connection retry limit (%d) exceeded", retries))
m.Lock()
m.hbRunning = false
m.Unlock()
m.OnMaxReconnectionExhaustion()
return
}
}
select {
case <-time.After(time.Duration(timerInterval) * time.Second):
case <-m.pubnub.ctx.Done():
m.pubnub.Config.Log.Printf(fmt.Sprintf("pubnub.ctx.Done\n"))
m.Lock()
m.hbRunning = false
m.Unlock()
return
case <-m.exitReconnectionManager:
m.pubnub.Config.Log.Printf(fmt.Sprintf("exitReconnectionManager\n"))
return
}
}
}
func (m *ReconnectionManager) getExponentialInterval() int {
timerInterval := int(math.Pow(2, float64(m.ExponentialMultiplier)) - 1)
if timerInterval > reconnectionMaxExponentialBackoff {
timerInterval = reconnectionMinExponentialBackoff
m.Lock()
m.ExponentialMultiplier = 1
m.pubnub.Config.Log.Printf(fmt.Sprintf("timerInterval > MaxExponentialBackoff at: %d\n", m.ExponentialMultiplier))
m.Unlock()
} else if timerInterval < 1 {
timerInterval = reconnectionMinExponentialBackoff
m.Lock()
m.ExponentialMultiplier = 1
m.pubnub.Config.Log.Printf(fmt.Sprintf("timerInterval < 1 at: %d\n", m.ExponentialMultiplier))
m.Unlock()
}
return timerInterval
}
func (m *ReconnectionManager) stopHeartbeatTimer() {
m.pubnub.Config.Log.Printf("stopHeartbeatTimer")
m.Lock()
if m.hbRunning {
m.hbRunning = false
m.exitReconnectionManager <- true
}
m.Unlock()
m.pubnub.Config.Log.Printf("stopHeartbeatTimer true")
}