/*
File Name:  Networks.go
Copyright:  2021 Peernet s.r.o.
Author:     Peter Kleissner
*/

package core

import (
	"sync"

	"github.com/PeernetOfficial/core/protocol"
)

// Networks is the collection of all connected networks
type Networks struct {
	// networks is a list of all connected networks
	networks4, networks6 []*Network

	// Mutex for both network lists. Higher granularity currently not needed.
	sync.RWMutex

	// countListenX is the number of networks listened to, excluding link-local only listeners. This number might be different than len(networksN).
	// This is useful to determine if there are any IPv4 or IPv6 listeners for potential external connections. This can be used to determine IPv4_LISTEN and IPv6_LISTEN.
	countListen4, countListen6 int64

	// channel for processing incoming decoded packets by workers, across all networks
	rawPacketsIncoming chan networkWire

	// Sequences keeps track of all message sequence number, regardless of the network connection.
	Sequences *protocol.SequenceManager

	// ipListen keeps a simple list of IPs listened to. This allows quickly identifying if an IP matches with a listened one.
	ipListen *ipList
}

//  ReplyTimeout is the round-trip timeout for message sequences.
const ReplyTimeout = 20

var networks *Networks

func initMessageSequence() {
	networks = &Networks{}

	networks.rawPacketsIncoming = make(chan networkWire, 1000) // buffer up to 1000 UDP packets before they get buffered by the OS network stack and eventually dropped

	networks.Sequences = protocol.NewSequenceManager(ReplyTimeout)

	networks.ipListen = NewIPList()
}