142 lines
4.0 KiB
Go
142 lines
4.0 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package simulation_test
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
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"github.com/ethersphere/swarm/network"
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"github.com/ethersphere/swarm/network/simulation"
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)
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// Every node can have a Kademlia associated using the node bucket under
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// BucketKeyKademlia key. This allows to use WaitTillHealthy to block until
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// all nodes have the their Kademlias healthy.
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func ExampleSimulation_WaitTillHealthy() {
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sim := simulation.New(map[string]simulation.ServiceFunc{
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"bzz": func(ctx *adapters.ServiceContext, b *sync.Map) (node.Service, func(), error) {
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addr := network.NewAddr(ctx.Config.Node())
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hp := network.NewHiveParams()
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hp.Discovery = false
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config := &network.BzzConfig{
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OverlayAddr: addr.Over(),
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UnderlayAddr: addr.Under(),
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HiveParams: hp,
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}
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kad := network.NewKademlia(addr.Over(), network.NewKadParams())
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// store kademlia in node's bucket under BucketKeyKademlia
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// so that it can be found by WaitTillHealthy method.
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b.Store(simulation.BucketKeyKademlia, kad)
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return network.NewBzz(config, kad, nil, nil, nil), nil, nil
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},
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})
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defer sim.Close()
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_, err := sim.AddNodesAndConnectRing(10)
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if err != nil {
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// handle error properly...
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panic(err)
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}
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ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
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defer cancel()
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ill, err := sim.WaitTillHealthy(ctx)
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if err != nil {
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// inspect the latest detected not healthy kademlias
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for id, kad := range ill {
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fmt.Println("Node", id)
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fmt.Println(kad.String())
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}
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// handle error...
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}
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// continue with the test
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}
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// Watch all peer events in the simulation network, buy receiving from a channel.
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func ExampleSimulation_PeerEvents() {
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sim := simulation.New(nil)
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defer sim.Close()
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events := sim.PeerEvents(context.Background(), sim.NodeIDs())
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go func() {
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for e := range events {
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if e.Error != nil {
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log.Error("peer event", "err", e.Error)
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continue
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}
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log.Info("peer event", "node", e.NodeID, "peer", e.PeerID, "type", e.Event.Type)
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}
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}()
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}
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// Detect when a nodes drop a peer.
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func ExampleSimulation_PeerEvents_disconnections() {
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sim := simulation.New(nil)
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defer sim.Close()
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disconnections := sim.PeerEvents(
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context.Background(),
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sim.NodeIDs(),
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simulation.NewPeerEventsFilter().Drop(),
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)
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go func() {
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for d := range disconnections {
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if d.Error != nil {
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log.Error("peer drop", "err", d.Error)
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continue
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}
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log.Warn("peer drop", "node", d.NodeID, "peer", d.PeerID)
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}
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}()
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}
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// Watch multiple types of events or messages. In this case, they differ only
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// by MsgCode, but filters can be set for different types or protocols, too.
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func ExampleSimulation_PeerEvents_multipleFilters() {
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sim := simulation.New(nil)
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defer sim.Close()
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msgs := sim.PeerEvents(
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context.Background(),
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sim.NodeIDs(),
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// Watch when bzz messages 1 and 4 are received.
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simulation.NewPeerEventsFilter().ReceivedMessages().Protocol("bzz").MsgCode(1),
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simulation.NewPeerEventsFilter().ReceivedMessages().Protocol("bzz").MsgCode(4),
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)
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go func() {
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for m := range msgs {
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if m.Error != nil {
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log.Error("bzz message", "err", m.Error)
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continue
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}
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log.Info("bzz message", "node", m.NodeID, "peer", m.PeerID)
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}
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}()
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}
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