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// Copyright (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"context"
"math/rand"
"time"
waBinary "go.mau.fi/whatsmeow/binary"
"go.mau.fi/whatsmeow/types"
"go.mau.fi/whatsmeow/types/events"
)
var (
// KeepAliveResponseDeadline specifies the duration to wait for a response to websocket keepalive pings.
KeepAliveResponseDeadline = 10 * time.Second
// KeepAliveIntervalMin specifies the minimum interval for websocket keepalive pings.
KeepAliveIntervalMin = 20 * time.Second
// KeepAliveIntervalMax specifies the maximum interval for websocket keepalive pings.
KeepAliveIntervalMax = 30 * time.Second
// KeepAliveMaxFailTime specifies the maximum time to wait before forcing a reconnect if keepalives fail repeatedly.
KeepAliveMaxFailTime = 3 * time.Minute
)
func (cli *Client) keepAliveLoop(ctx context.Context) {
lastSuccess := time.Now()
var errorCount int
for {
interval := rand.Int63n(KeepAliveIntervalMax.Milliseconds()-KeepAliveIntervalMin.Milliseconds()) + KeepAliveIntervalMin.Milliseconds()
select {
case <-time.After(time.Duration(interval) * time.Millisecond):
isSuccess, shouldContinue := cli.sendKeepAlive(ctx)
if !shouldContinue {
return
} else if !isSuccess {
errorCount++
go cli.dispatchEvent(&events.KeepAliveTimeout{
ErrorCount: errorCount,
LastSuccess: lastSuccess,
})
if cli.EnableAutoReconnect && time.Since(lastSuccess) > KeepAliveMaxFailTime {
cli.Log.Debugf("Forcing reconnect due to keepalive failure")
cli.Disconnect()
go cli.autoReconnect()
}
} else {
if errorCount > 0 {
errorCount = 0
go cli.dispatchEvent(&events.KeepAliveRestored{})
}
lastSuccess = time.Now()
}
case <-ctx.Done():
return
}
}
}
func (cli *Client) sendKeepAlive(ctx context.Context) (isSuccess, shouldContinue bool) {
respCh, err := cli.sendIQAsync(infoQuery{
Namespace: "w:p",
Type: "get",
To: types.ServerJID,
Content: []waBinary.Node{{Tag: "ping"}},
})
if err != nil {
cli.Log.Warnf("Failed to send keepalive: %v", err)
return false, true
}
select {
case <-respCh:
// All good
return true, true
case <-time.After(KeepAliveResponseDeadline):
cli.Log.Warnf("Keepalive timed out")
return false, true
case <-ctx.Done():
return false, false
}
}
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