swarm: ctx propagation; bmt fixes; pss generic notification framework (#17150)

* cmd/swarm: minor cli flag text adjustments

* swarm/api/http: sticky footer for swarm landing page using flex

* swarm/api/http: sticky footer for error pages and fix for multiple choices

* cmd/swarm, swarm/storage, swarm: fix  mingw on windows test issues

* cmd/swarm: update description of swarm cmd

* swarm: added network ID test

* cmd/swarm: support for smoke tests on the production swarm cluster

* cmd/swarm/swarm-smoke: simplify cluster logic as per suggestion

* swarm: propagate ctx to internal apis (#754)

* swarm/metrics: collect disk measurements

* swarm/bmt: fix io.Writer interface

  * Write now tolerates arbitrary variable buffers
  * added variable buffer tests
  * Write loop and finalise optimisation
  * refactor / rename
  * add tests for empty input

* swarm/pss: (UPDATE) Generic notifications package (#744)

swarm/pss: Generic package for creating pss notification svcs

* swarm: Adding context to more functions

* swarm/api: change colour of landing page in templates

* swarm/api: change landing page to react to enter keypress

1 files changed, 266 insertions, 0 deletions

diff --git a/swarm/network/networkid_test.go b/swarm/network/networkid_test.go
new file mode 100644
index 000000000..05134b083
--- /dev/null
+++ b/swarm/network/networkid_test.go
@@ -0,0 +1,266 @@
+// 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/>.
+
+package network
+
+import (
+	"bytes"
+	"context"
+	"flag"
+	"fmt"
+	"math/rand"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/simulations"
+	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+var (
+	currentNetworkID int
+	cnt              int
+	nodeMap          map[int][]discover.NodeID
+	kademlias        map[discover.NodeID]*Kademlia
+)
+
+const (
+	NumberOfNets = 4
+	MaxTimeout   = 6
+)
+
+func init() {
+	flag.Parse()
+	rand.Seed(time.Now().Unix())
+}
+
+/*
+Run the network ID test.
+The test creates one simulations.Network instance,
+a number of nodes, then connects nodes with each other in this network.
+
+Each node gets a network ID assigned according to the number of networks.
+Having more network IDs is just arbitrary in order to exclude
+false positives.
+
+Nodes should only connect with other nodes with the same network ID.
+After the setup phase, the test checks on each node if it has the
+expected node connections (excluding those not sharing the network ID).
+*/
+func TestNetworkID(t *testing.T) {
+	log.Debug("Start test")
+	//arbitrarily set the number of nodes. It could be any number
+	numNodes := 24
+	//the nodeMap maps all nodes (slice value) with the same network ID (key)
+	nodeMap = make(map[int][]discover.NodeID)
+	//set up the network and connect nodes
+	net, err := setupNetwork(numNodes)
+	if err != nil {
+		t.Fatalf("Error setting up network: %v", err)
+	}
+	defer func() {
+		//shutdown the snapshot network
+		log.Trace("Shutting down network")
+		net.Shutdown()
+	}()
+	//let's sleep to ensure all nodes are connected
+	time.Sleep(1 * time.Second)
+	//for each group sharing the same network ID...
+	for _, netIDGroup := range nodeMap {
+		log.Trace("netIDGroup size", "size", len(netIDGroup))
+		//...check that their size of the kademlia is of the expected size
+		//the assumption is that it should be the size of the group minus 1 (the node itself)
+		for _, node := range netIDGroup {
+			if kademlias[node].addrs.Size() != len(netIDGroup)-1 {
+				t.Fatalf("Kademlia size has not expected peer size. Kademlia size: %d, expected size: %d", kademlias[node].addrs.Size(), len(netIDGroup)-1)
+			}
+			kademlias[node].EachAddr(nil, 0, func(addr OverlayAddr, _ int, _ bool) bool {
+				found := false
+				for _, nd := range netIDGroup {
+					p := ToOverlayAddr(nd.Bytes())
+					if bytes.Equal(p, addr.Address()) {
+						found = true
+					}
+				}
+				if !found {
+					t.Fatalf("Expected node not found for node %s", node.String())
+				}
+				return true
+			})
+		}
+	}
+	log.Info("Test terminated successfully")
+}
+
+// setup simulated network with bzz/discovery and pss services.
+// connects nodes in a circle
+// if allowRaw is set, omission of builtin pss encryption is enabled (see PssParams)
+func setupNetwork(numnodes int) (net *simulations.Network, err error) {
+	log.Debug("Setting up network")
+	quitC := make(chan struct{})
+	errc := make(chan error)
+	nodes := make([]*simulations.Node, numnodes)
+	if numnodes < 16 {
+		return nil, fmt.Errorf("Minimum sixteen nodes in network")
+	}
+	adapter := adapters.NewSimAdapter(newServices())
+	//create the network
+	net = simulations.NewNetwork(adapter, &simulations.NetworkConfig{
+		ID:             "NetworkIdTestNet",
+		DefaultService: "bzz",
+	})
+	log.Debug("Creating networks and nodes")
+
+	var connCount int
+
+	//create nodes and connect them to each other
+	for i := 0; i < numnodes; i++ {
+		log.Trace("iteration: ", "i", i)
+		nodeconf := adapters.RandomNodeConfig()
+		nodes[i], err = net.NewNodeWithConfig(nodeconf)
+		if err != nil {
+			return nil, fmt.Errorf("error creating node %d: %v", i, err)
+		}
+		err = net.Start(nodes[i].ID())
+		if err != nil {
+			return nil, fmt.Errorf("error starting node %d: %v", i, err)
+		}
+		client, err := nodes[i].Client()
+		if err != nil {
+			return nil, fmt.Errorf("create node %d rpc client fail: %v", i, err)
+		}
+		//now setup and start event watching in order to know when we can upload
+		ctx, watchCancel := context.WithTimeout(context.Background(), MaxTimeout*time.Second)
+		defer watchCancel()
+		watchSubscriptionEvents(ctx, nodes[i].ID(), client, errc, quitC)
+		//on every iteration we connect to all previous ones
+		for k := i - 1; k >= 0; k-- {
+			connCount++
+			log.Debug(fmt.Sprintf("Connecting node %d with node %d; connection count is %d", i, k, connCount))
+			err = net.Connect(nodes[i].ID(), nodes[k].ID())
+			if err != nil {
+				if !strings.Contains(err.Error(), "already connected") {
+					return nil, fmt.Errorf("error connecting nodes: %v", err)
+				}
+			}
+		}
+	}
+	//now wait until the number of expected subscriptions has been finished
+	//`watchSubscriptionEvents` will write with a `nil` value to errc
+	for err := range errc {
+		if err != nil {
+			return nil, err
+		}
+		//`nil` received, decrement count
+		connCount--
+		log.Trace("count down", "cnt", connCount)
+		//all subscriptions received
+		if connCount == 0 {
+			close(quitC)
+			break
+		}
+	}
+	log.Debug("Network setup phase terminated")
+	return net, nil
+}
+
+func newServices() adapters.Services {
+	kademlias = make(map[discover.NodeID]*Kademlia)
+	kademlia := func(id discover.NodeID) *Kademlia {
+		if k, ok := kademlias[id]; ok {
+			return k
+		}
+		addr := NewAddrFromNodeID(id)
+		params := NewKadParams()
+		params.MinProxBinSize = 2
+		params.MaxBinSize = 3
+		params.MinBinSize = 1
+		params.MaxRetries = 1000
+		params.RetryExponent = 2
+		params.RetryInterval = 1000000
+		kademlias[id] = NewKademlia(addr.Over(), params)
+		return kademlias[id]
+	}
+	return adapters.Services{
+		"bzz": func(ctx *adapters.ServiceContext) (node.Service, error) {
+			addr := NewAddrFromNodeID(ctx.Config.ID)
+			hp := NewHiveParams()
+			hp.Discovery = false
+			cnt++
+			//assign the network ID
+			currentNetworkID = cnt % NumberOfNets
+			if ok := nodeMap[currentNetworkID]; ok == nil {
+				nodeMap[currentNetworkID] = make([]discover.NodeID, 0)
+			}
+			//add this node to the group sharing the same network ID
+			nodeMap[currentNetworkID] = append(nodeMap[currentNetworkID], ctx.Config.ID)
+			log.Debug("current network ID:", "id", currentNetworkID)
+			config := &BzzConfig{
+				OverlayAddr:  addr.Over(),
+				UnderlayAddr: addr.Under(),
+				HiveParams:   hp,
+				NetworkID:    uint64(currentNetworkID),
+			}
+			return NewBzz(config, kademlia(ctx.Config.ID), nil, nil, nil), nil
+		},
+	}
+}
+
+func watchSubscriptionEvents(ctx context.Context, id discover.NodeID, client *rpc.Client, errc chan error, quitC chan struct{}) {
+	events := make(chan *p2p.PeerEvent)
+	sub, err := client.Subscribe(context.Background(), "admin", events, "peerEvents")
+	if err != nil {
+		log.Error(err.Error())
+		errc <- fmt.Errorf("error getting peer events for node %v: %s", id, err)
+		return
+	}
+	go func() {
+		defer func() {
+			sub.Unsubscribe()
+			log.Trace("watch subscription events: unsubscribe", "id", id)
+		}()
+
+		for {
+			select {
+			case <-quitC:
+				return
+			case <-ctx.Done():
+				select {
+				case errc <- ctx.Err():
+				case <-quitC:
+				}
+				return
+			case e := <-events:
+				if e.Type == p2p.PeerEventTypeAdd {
+					errc <- nil
+				}
+			case err := <-sub.Err():
+				if err != nil {
+					select {
+					case errc <- fmt.Errorf("error getting peer events for node %v: %v", id, err):
+					case <-quitC:
+					}
+					return
+				}
+			}
+		}
+	}()
+}