swarm: network simulation for swarm tests (#769)

* cmd/swarm: minor cli flag text adjustments

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

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

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

* changed colour of landing page

* landing page reacts to enter keypress

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

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

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

* swarm/simnet: add basic node/service functions

* swarm/netsim: add buckets for global state and kademlia health check

* swarm/netsim: Use sync.Map as bucket and provide cleanup function for...

* swarm, swarm/netsim: adjust SwarmNetworkTest

* swarm/netsim: fix tests

* swarm: added visualization option to sim net redesign

* swarm/netsim: support multiple services per node

* swarm/netsim: remove redundant return statement

* swarm/netsim: add comments

* swarm: shutdown HTTP in Simulation.Close

* swarm: sim HTTP server timeout

* swarm/netsim: add more simulation methods and peer events examples

* swarm/netsim: add WaitKademlia example

* swarm/netsim: fix comments

* swarm/netsim: terminate peer events goroutines on simulation done

* swarm, swarm/netsim: naming updates

* swarm/netsim: return not healthy kademlias on WaitTillHealthy

* swarm: fix WaitTillHealthy call in testSwarmNetwork

* swarm/netsim: allow bucket to have any type for a key

* swarm: Added snapshots to new netsim

* swarm/netsim: add more tests for bucket

* swarm/netsim: move http related things into separate files

* swarm/netsim: add AddNodeWithService option

* swarm/netsim: add more tests and Start* methods

* swarm/netsim: add peer events and kademlia tests

* swarm/netsim: fix some tests flakiness

* swarm/netsim: improve random nodes selection, fix TestStartStop* tests

* swarm/netsim: remove time measurement from TestClose to avoid flakiness

* swarm/netsim: builder pattern for netsim HTTP server (#773)

* swarm/netsim: add connect related tests

* swarm/netsim: add comment for TestPeerEvents

* swarm: rename netsim package to network/simulation

1 files changed, 81 insertions, 0 deletions

diff --git a/swarm/network/simulation/bucket.go b/swarm/network/simulation/bucket.go
new file mode 100644
index 000000000..b37afaaa4
--- /dev/null
+++ b/swarm/network/simulation/bucket.go
@@ -0,0 +1,81 @@
+// 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 simulation
+
+import (
+	"github.com/ethereum/go-ethereum/p2p/discover"
+)
+
+// BucketKey is the type that should be used for keys in simulation buckets.
+type BucketKey string
+
+// NodeItem returns an item set in ServiceFunc function for a particualar node.
+func (s *Simulation) NodeItem(id discover.NodeID, key interface{}) (value interface{}, ok bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, ok := s.buckets[id]; !ok {
+		return nil, false
+	}
+	return s.buckets[id].Load(key)
+}
+
+// SetNodeItem sets a new item associated with the node with provided NodeID.
+// Buckets should be used to avoid managing separate simulation global state.
+func (s *Simulation) SetNodeItem(id discover.NodeID, key interface{}, value interface{}) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	s.buckets[id].Store(key, value)
+}
+
+// NodeItems returns a map of items from all nodes that are all set under the
+// same BucketKey.
+func (s *Simulation) NodesItems(key interface{}) (values map[discover.NodeID]interface{}) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	ids := s.NodeIDs()
+	values = make(map[discover.NodeID]interface{}, len(ids))
+	for _, id := range ids {
+		if _, ok := s.buckets[id]; !ok {
+			continue
+		}
+		if v, ok := s.buckets[id].Load(key); ok {
+			values[id] = v
+		}
+	}
+	return values
+}
+
+// UpNodesItems returns a map of items with the same BucketKey from all nodes that are up.
+func (s *Simulation) UpNodesItems(key interface{}) (values map[discover.NodeID]interface{}) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	ids := s.UpNodeIDs()
+	values = make(map[discover.NodeID]interface{})
+	for _, id := range ids {
+		if _, ok := s.buckets[id]; !ok {
+			continue
+		}
+		if v, ok := s.buckets[id].Load(key); ok {
+			values[id] = v
+		}
+	}
+	return values
+}