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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// simple abstraction for implementing pss functionality
//
// the pss client library aims to simplify usage of the p2p.protocols package over pss
//
// IO is performed using the ordinary p2p.MsgReadWriter interface, which transparently communicates with a pss node via RPC using websockets as transport layer, using methods in the PssAPI class in the swarm/pss package
//
//
// Minimal-ish usage example (requires a running pss node with websocket RPC):
//
//
// import (
// "context"
// "fmt"
// "os"
// pss "github.com/dexon-foundation/dexon/swarm/pss/client"
// "github.com/dexon-foundation/dexon/p2p/protocols"
// "github.com/dexon-foundation/dexon/p2p"
// "github.com/dexon-foundation/dexon/swarm/pot"
// "github.com/dexon-foundation/dexon/swarm/log"
// )
//
// type FooMsg struct {
// Bar int
// }
//
//
// func fooHandler (msg interface{}) error {
// foomsg, ok := msg.(*FooMsg)
// if ok {
// log.Debug("Yay, just got a message", "msg", foomsg)
// }
// return errors.New(fmt.Sprintf("Unknown message"))
// }
//
// spec := &protocols.Spec{
// Name: "foo",
// Version: 1,
// MaxMsgSize: 1024,
// Messages: []interface{}{
// FooMsg{},
// },
// }
//
// proto := &p2p.Protocol{
// Name: spec.Name,
// Version: spec.Version,
// Length: uint64(len(spec.Messages)),
// Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
// pp := protocols.NewPeer(p, rw, spec)
// return pp.Run(fooHandler)
// },
// }
//
// func implementation() {
// cfg := pss.NewClientConfig()
// psc := pss.NewClient(context.Background(), nil, cfg)
// err := psc.Start()
// if err != nil {
// log.Crit("can't start pss client")
// os.Exit(1)
// }
//
// log.Debug("connected to pss node", "bzz addr", psc.BaseAddr)
//
// err = psc.RunProtocol(proto)
// if err != nil {
// log.Crit("can't start protocol on pss websocket")
// os.Exit(1)
// }
//
// addr := pot.RandomAddress() // should be a real address, of course
// psc.AddPssPeer(addr, spec)
//
// // use the protocol for something
//
// psc.Stop()
// }
//
// BUG(test): TestIncoming test times out due to deadlock issues in the swarm hive
package client
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