Add dependencies/vendor (whatsapp)

vendor/go.mau.fi/whatsmeow/keepalive.go

@@ -0,0 +1,62 @@
+// 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"
+)
+
+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
+)
+
+func (cli *Client) keepAliveLoop(ctx context.Context) {
+	for {
+		interval := rand.Int63n(KeepAliveIntervalMax.Milliseconds()-KeepAliveIntervalMin.Milliseconds()) + KeepAliveIntervalMin.Milliseconds()
+		select {
+		case <-time.After(time.Duration(interval) * time.Millisecond):
+			if !cli.sendKeepAlive(ctx) {
+				return
+			}
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (cli *Client) sendKeepAlive(ctx context.Context) 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 true
+	}
+	select {
+	case <-respCh:
+		// All good
+	case <-time.After(KeepAliveResponseDeadline):
+		// TODO disconnect websocket?
+		cli.Log.Warnf("Keepalive timed out")
+	case <-ctx.Done():
+		return false
+	}
+	return true
+}